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Paper des Monats
- ja (1)
Manufacturing of CIGSe thin film solar modules involves typically one laser structuring step (P1) and two mechanical structuring steps (P2 and P3) for serial interconnection. In our approach, complete laser structuring is successfully demonstrated by application of short nanosecond laser pulses (<10 ns) with a single, visible wavelength of 532 nm. The P1 and the P3 trenches are scribed by induced and direct ablation, respectively. For the P2 scribe, the thermal input of the ns laser pulses is used to transform the CIGSe absorber layer locally into a highly conductive compound to provide proper electrical interconnection. These findings promise further simplification and flexibility to thin film solar cell production.
Structuring of thin-film photovoltaic modules requires basic knowledge of the laser – thin-film interaction in order to adapt the accessible laser parameters, like wavelength, power, repetition rate and scribing speed whilst taking into account the specific material properties of the layer. We have studied the nanosecond laserablation behavior of corresponding layers (i) of silicon based thin-film solar cells with a-Si/µc-Si tandem absorber type and (ii) of back contact and absorber layer of CIGSe solar cells. The respective ablation threshold fluences were determined as integrative parameters describing the specific laser – material interaction. For the threshold determination we used two different methods and developed a new analytical approach taking into account scribing through the glass substrate as it is preferred for most structuring processes. This was done by analyzing the thin film ablation results by means of optical microscopy, profilometry, scanning electron microscopy (SEM). Moreover, we determined the incubation coefficient of the regarded material layers which allows us to predict quantitatively the influence of the spot overlap on the scribing threshold.
Towards an industrial laser doping process for the selective emitter using phosphoric acid as dopant
(2011)
Different laser supported approaches have already been realized, proving the great potential of laserdoped selective emitters (LDSE). However, it is challenging to establish a low-cost process by using pulsed laser tools. So far a single-step process only leads to satisfying results utilizing cw-lasers. In this paper we have examined a two-step process to produce laser-doped selective emitters on multicrystalline textured standard silicon photovoltaic wafers (90-Ω/sq-Emitter, SiN-antireflection coating (ARC)). The precise ARC removal by near-infrared fs-laser pulses (30 fs, 800 nm), and the doping of uncoated silicon wafers by ns-laser pulses (8 ns, 532 nm) were systematically investigated. In the fs-experiment, optimum conditions for ARC removal were identified. In the nsexperiments under suitable conditions (melting regime), the phosphorous concentration underneath the wafer surface was significantly increased and the sheet resistance was reduced by nearly a factor of two. Moreover, electrical measurements on fired metallization fingers deposited on the laser processed wafers showed low contact resistances. Hence, wafer conditioning with combined fs-laser- and ns-laser-processes are expected to be a promising technology for producing selective emitters.
The selective emitter is a well-known technology for producing highly doped areas under the metallization grid to improve the solar cell performance. In this work, the influence of laser irradiation on phosphoric acid coated multicrystalline silicon PV-wafers on the wafer surface structure, the phosphorous depth distribution and the electrical contact resistance within the laser treated area as well as the electrical series resistance of laserprocessed solar cells was evaluated. Different laser processing settings were tested including pulsed and continuous wave (cw) laser sources (515 nm, 532 nm, 1064 nm wavelength). Complementary numerical simulations using the finite element method (FEM) were conducted to explain the impact of the laser parameters on the melting behavior (melt duration and geometry). It was found that the melt duration is a key parameter for a successful laser Doping process. Our simulations at a laser wavelengths of 515 nm reveal that low-repetition rate (<500 kHz) laser pulses of 300 ns duration generate a melt duration of ~0.35 µs, whereas upon scanning cw-laser radiation at 532 nm prolongates the melt duration by at least one order of magnitude. Experimentally, the widely used ns-laser pulses did not lead to satisfying laser irradiation results. In contrast, cw-laser radiation and scan velocities of less than 2 m/s led to suitable laser doping featuring low electrical resistances in the laser treated areas.
Die lokalen Festigkeiten im Bereich einer Schweißverbindung sind maßgebend für deren Widerstandsfähigkeit gegenüber mechanischen Beanspruchungen. Im Gegensatz zu anderen präparationsaufwendigen Methoden, z. B. die Untersuchung von Mikro-Zugproben, liefert die instrumentierte Eindringprüfung mit deutlich geringerem Aufwand Verläufe von Festigkeiten mit sehr guter Ortsauflösung. Es werden wahre Spannungs-Dehnungs-Kurven aus zyklischen Eindringversuchen mittels Auswertungen auf der Basis repräsentativer Spannungen und Dehnungen und auf der Basis neuronaler Netze an Punktschweißverbindungen zweier hochfester Stähle, eines TRIP-Stahls und eines martensitischen Stahls, sowie eines weichen niedrig legierten Stahls bestimmt, jeweils im Bereich des Grundwerkstoffs und der Schweißlinse.
Use of higher-alloyed metallic materials and duplex steels for transport tanks of dangerous goods
(2011)
Compatibility evaluations of selected metallic materials under the influence of dangerous goods are published in the BAM-List - Requirements for Tanks for the Transport of Dangerous Goods” as basis for substance-related prototype approvals for tank Containers designed for the carriage of dangerous goods.
There is a request of the tank manufacturing industry and transportation Companies to incorporate additional materials into the BAM-List, especially corrosion-resistant materials because of the large number of corrosive dangerous goods. One solution to solve corrosion Problems is to line the tank with a polymer, an alternative solution is the application of high-alloyed stainless steels and nickel-based alloys as there are 1.4529 (XINiCrMoCu 25-20-7, alloy 926), 1.4562 (X1NiCrMoCu32-28-7, alloy 31) and 2.4605 (NiCr23Mo16AI, alloy 59).
There is an interest to use cost-efficient steels with high strength values and concomitant adequate corrosion resistance such as duplex steel 1.4362 (X2CrNiN23-4).
This steel grade was originally developed as a substitute for the austenitic grades 1.4404 (X2CrNiMo17-12-2) and 1.4571 (X6CrNiMoTi17-12-2). Due to the lower content of the alloy elements nickel and molybdenum this duplex steel is a cost-efficient alternative to molybdenum containing austenite.
Due to the limited number of corrosion test results with welded test samples of these high-alloyed materials and the duplex steel under the influence of corrosive dangerous goods a comprehensive test Programme was performed with these materials in Cooperation with ThyssenKrupp VDM and Deutsche Edelstahlwerke GmbH. It can be concluded from the test results that the superaustenitic steels 1.4529 and 1.4562 as well as the nickel-based alloy 2.4605 are a really good alternative as tank materials for the transport of dangerous goods in comparison to the lining of the tanks. The nickel-based alloy 2.4605 shows the best resistance and is suitable as material for tanks transporting all tested corrosive substances. One exception is the temperature limit during the transport of hydrochloric acid.
The superaustenit 1.4562 is a resistant material with a wide ränge of application. Exceptions for use are: ammonium bifluoride, brine, 34 % calcium Chloride solution, hydrochloric acid, perchloric acid, 90 % 2-chloropropionic acid, nitrating acid with nitric acid content > 50 % and molten monochloroacetic acid. The alloy is limited suitable for allyl Chloride, aluminum Chloride, copper (II) -Chloride and ferric Chloride. The superaustenit 1.4529 showed the lowest resistance compared to the other two materials. This steel is not resistant in hydrochloric acid, perchloric acid, sodium Chlorite and sodium hypochlorite. The application is limited in the concentration ränge of aqueous Solutions of aluminum Chloride, copper (II) Chloride and ferric Chloride. Due to the reduced alloying content of the duplex steel 1.4362 (X2CrNiN23-4) compared to the austenitic CrNiMo-steels, a lower resistance especially in acidic media like formic, acetic or sulfuric acid was observed. Within the more than 7.000 substances contained in the BAM-List there is a large amount of dangerous goods such as hydrocarbons, alcohols, aldehydes, ketones, ethers, esters, and inorganic alkaline substances which have a large transport volume and do not corrode the duplex steel 1.4362 (X2CrNiN23-4).
The test results are included in the actual 11th edition of the BAM-List and therefore available for the costumer.
Rubbers are often used for seal applications due to their special material properties and easy use. In many applications the material is exposed to low temperatures during Operation. Therefore it is important to know the material behavior at low temperatures to determine the temperature ränge that allows a Safe Operation of the seal, e.g. in storage and transport Containers for radioactive materials.
The seal function of an elastomer is limited in temperature by the rubber-glass transition during which the material properties change from rubber-like to stiff and glass-like. For a given application this correlation is not trivial and therefore needs an in-depth investigation under consideration of the physical properties and the
application conditions.
In this work different analytical methods are used to characterize the material behavior at low temperature in the ränge of the glass-rubber-transition and are compared with the quality of Operation of a component which is here defined by the detected leakage rate.
We present the status of our work on a tube shaped 3D deformation sensor based on continuously distributed fiber optic sensing. A sensor tube of very large diameter is used to ensure high sensitivity while the transportability and applicability are still comfortable due to our application strategy. The setup is designed to use different measurement techniques in the applied optical fibers including Brillouin based measurements and interferometric optical frequency domain measurements using an OBR 4400 from Luna Technologies.
Zur Abschätzung der Lebensdauer eines bei höherer Temperatur langzeitbelasteten Bauteils wurden Zeitstandversuche, Relaxationsversuche und weitere Versuche mit unterschiedlichen Umgebungssteifigkeiten durchgeführt.
Die Zeitstandversuche, deren Versuchsführung eine unendlich niedrige Umgebungssteifigkeit simuliert, liefern geringere Lebensdauern (Bruchzeiten) im Vergleich zu Versuchen mit endlich hohen, technisch relevanten Steifigkeiten bei vergleichbarer Probensteifigkeit (Geometrie), wobei die Lebensdauern mit steigender Umgebungssteifigkeit zunehmen. Die längsten Lebensdauern zeigen Relaxationsversuche mit einer unendlich hohen Umgebungssteifigkeit aufgrund ihrer Versuchsregelung.
Für die Übertragung der an Proben gewonnenen Ergebnisse auf das Bauteil wurde das Steifigkeitsverhältnis Z zwischen der Steifigkeit der 'Probe' und der der 'Umgebung' definiert und angewandt. Das Steifigkeitsverhältnis des kritischen Bereichs im Bauteil und das der Werkstoffprobe in der Prüfmaschine sollten möglichst ähnlich sein. Dann lassen sich bei der Übertragung auf das Bauteil realistisch höhere Lebensdauern abschätzen als nur mit Kenntnis der Ergebnisse der Zeit-standversuche.
Die Restlebensdauerabschätzung von Faserkunststoffverbunden ist ein ungelöstes
Problem. Die Beobachtung der Matrixschädigung ist dabei ein vielversprechender Ansatz zur Bewertung des Schädigungszustandes insgesamt. Unter kombinierter Beobachtung mit Röntgenrefraktionsmessungen und Schallemissionsmessung wurden uni- und biaxiale Lasten statisch und zyklisch auf Kohlenstofffaserepoxidharz-Proben aufgebracht. Die uniaxiale Belastung erfolgt mittels einer eigenentwickelten Kompaktprüfmaschine direkt während der Röntgenrefraktions- und Schallemissionsmessung in der Röntgenkammer. Die biaxiale Belastung wird an Modelldruckbehältern ebenfalls mit Schallemissionsmessung durchgeführt. Hier wird der Modelldruckbehälter mit dem Röntgenrefraktionsverfahren periodisch inspiziert.
Structural performances of earthen building materials. A comparison between different typologies
(2011)
Traditional construction techniques utilizing earthen materials are often seen as inferior compared to modern ways of building. Structural earthen elements are perceived as vulnerable towards environmental influences (moisture, frost) and in particular towards the load scenarios during earthquakes. In comparison to the recent advances in research on stone and brick masonry, knowledge on the structural performance of earthen building construction is limited and scattered. Consequently the confidence in the performance of these earthen buildings constructed in the traditional techniques during earthquakes is fairly low. The research presented here aims to make a comparison of mechanical behavior between different earth masonry material typologies, consisting of earth block masonry, rammed earth and cob. The paper has been developed in the framework of a larger research program called NIKER. BAM and other seventeen research partners from the Mediterrean area are jointly involved to develop and validate innovative materials and technologies for the systemic improvement of the seismic behavior of Cultural Heritage assets
Experimental investigation of the laser-plume interaction during high power fiber laser welding
(2011)
The effect of the well-known plasma absorption and refraction in CO2-laser metal welding plumes is in case of high power solid state laser welding negligibly small. By contrast, the diffraction effects of shorter wavelength laser radiation are considerable. According
to the results of preliminary studies, the fine condensed metal particles in the welding plume can lead to essential worsening of the laser beam quality.
This work is devoted to the investigation of the lasermatter interaction during up to 20 kW ytterbium fiber laser welding of thick mild steel plates. The plume attenuation of a probe 1.3 µm wavelength diode laser beam as well as of continuous radiation in 250-600 nm
wavelength range was measured during welding with and without Ar shielding gas supply. The measured results allow it to calculate average size and concentration of fine condensed metal particles in
different plume areas using the multi-wavelength method and the Mie scattering theory. The plume temperature, which determines the condensation conditions, was measured by means of Fe I atom
spectral line emission registration.
The obtained results can be also of interest for remote metal treatment with high-power fiber or disc lasers.
In connection with the use of chemically unstable gases (especially acetylene and ethylene oxide) accidents keep on happening - amongst them also quite serious ones. These gases are known to be chemically unstable. A chemically unstable sas is a flammable gas that is able to react exolosivelv even in the absence of air or oxveen. The investigation of accidents showed that the Chemical instability of flammable gases played an important role in the severity of accidents. Therefore, this hazardous property was included in the global harmonizatiön of the Classification of Chemicals. The Classification of chemically unstable flammable gases and mixtures is an amendment to Chapter 2.2 “Flammable gases” of the UN Globally Harmonized System of Classification and Labelling of Chemicals (GHS), because most chemically unstable gases are flammable as well. The proposal to add them to the GHS originated from the experts of an informal working group of the UN Sub-Committee of Expert on the GHS (UNSCEGHS) headed by BAM, Germany. The UNSCEGHS has decided to include it in the Fourth Revised Edition of the GHS. The respective method for determining whether a gas is chemically unstable or not, is included in the UN Manual of Tests and Criteria. This paper presents some experimental investigations of these gases, the test methods, examples of new classifications and results from CHEMSAFE
Faserverbundbauteile werden durch Tränkung von Fasergewebe mit flüssigem Harz, in der Regel Epoxidharzen, und anschließender Härtung des Harzes gefertigt. Dabei kann man das Gewebe im Vorfeld mit reaktivem Harz tränken und als so genanntes Prepreg verarbeiten oder man injiziert das frisch mit dem Härter gemischte Harz in ein Werkzeug, in dem das Gewebe bereits liegt - z. B. beim RTM-Prozess. Ausgehend von der Aufgabenstellung, eine Prepregherstellung mit hohem Qualitätsstandard zu realisieren und Möglichkeiten der Fertigungskontrolle für den Prepreg-Verarbeiter aufzuzeigen, wurde an einem für die Prepregherstellung vorgesehenen Harzsystem eine weitgehende Charakterisierung des Aushärtungsverlaufs vorgenommen. Wegen der Schwierigkeit, schnell konstante Aushärtungstemperaturen zu erreichen, wurden bei allen Methoden mit einer Heizrate von 1 K/min von RT bis 200 °C aufgeheizt.
Cementitious materials, in particular concrete, are durable materials if prepared appropriately and the Service life of concrete structures is now often required to last 120 years or more. Concrete durability depends strongly on intrinsic (e.g. composition, porosity) and exterior factors (e.g. moisture condition and composition, frost cycles, load pattem). Deleterious actions leading to concrete degradation are often created by the environment. Extemal sulfate attack is one of the more spectacular damage scenarios for concrete structures caused by the ingress of sulfate ions into the pore System of the material and successive formation of expanding phases. Though in recent years well studied there are still many questions remaining conceming the mechanisms of sulfate attack. In particular over the last ten years, with the increased utilization of blended cements, new questions arose concerning the sulfate resistance of those binder Systems. In the presented study therefore a method was developed to analyze the changes of the phase composition within the micro structure due to sulfate attack. The analytical method was based on pX-Ray diffraction (pXRD) using Synchrotron radiation in Debye-Scherrer (transmission) geometry. The spatial resolution of the method is ca. 10 pm and allows the characterization of phase transformations in the wake of damaging processes in more detail compared to other techniques. Furthermore, the experimental setup provides the possibility for analyzing the phase assemblage of a given sample without destroying the micro structure. This is possible because the specimens for phase analysis consists of thick sections, which can be used for further microscopic analysis of the micro structure and micro chemistry (e.g. by SEM-EDX). Samples containing supplementary cementitious materials were measured in comparison and to reconstruct the influence of the degradation process in detail. Additionally, reaction ffonts within the samples were localized by micro x-ray fluorescence analysis (MXRF).
The inelastic torsional response of an asymmetric-plan hospital building is studied. The response of the structure in the time domain as recorded by highly sensitive sensor network, integrated by a data acquisition system. The identification was performed using techniques of modal extraction in the frequency domain (frequency Domain decomposition). A calibration process was applied in order to identify a reliable structural model to be used for the seismic vulnerability assessment of the hospital building. In particular, a nonlinear static procedure accounting for mass distribution, higher modes contribution and mode-shapes correlation was proposed for the estimation of the seismic response of irregular buildings. Finally, the influence of lateral force distribution, node control during pushover and accidental eccentricity is investigated.
The paper addresses two case studies of structural monitoring and seismic assessment of medieval masonry Towers in Italy: the bell tower of Aversa and the bell tower of Capua. These monuments in the Campania region were monitored by means of full-scale environmental vibration testing. Measured responses were then used for modal identification. The procedure is based on a typical finite element model updating technique based on vibration test results. Parameters optimization is carried out by minimizing a weighted error criterion relative to the building’s modal properties. A satisfactory improvement on modal parameters is thus obtained, resulting in a close Agreement between the modal properties observed in dynamic tests and those calculated from numerical model. Seismic assessment is carried out with nonlinear static analysis of the tower under multimodal distributions of lateral loads.
Nonlinear analysis indicates the potential collapse mechanisms and evidences dangerous structural weakness which may play a role in the seismic vulnerability of the towers.
Whenever the preservation of original substance obtains priority in a restoration task, reprofiling techniques using repair mortars are a welcome solution. For ordinary concrete repair aesthetic aspects are of minor importance whereas for the restoration of natural stone elements they come to the fore. Especially for listed buildings and monuments, historico-cultural and aesthetical interests become the ruling Parameters for planning and execution of restoration tasks. Nevertheless the technical and constructive requirements have to be considered and deterioration processes have to be understood to ensure sustainability and durability of the repair task. Due o differences in the Chemical and mineralogical composition, natural stone provides a vast variety of texture and colour. Also the range of different mechanical and durability related properties is far wider than found with concrete for example. A research project dealing with the development of a modular repair mortar System for natural stone is currently set up at the BAM. To provide the conservator with the best possible options to match colour, texture and technical requirements, the System will be setup on a modular basis. Several different binder Systems on basis of cement, lime and sodium Silicate as well as polymer based Systems are planned, which can be combined with different aggregate compositions and different pigments. To evaluate the mortar performance, test procedures will be defined for tests on mortar samples and on composite specimens. In the paper the experimental Programme will be explained and first results will be presented and discussed.
The paper has been developed in the framework of a larger EC‐research program called NIKER, in which BAM and other seventeen research partners from the Mediterrean area are jointly involved. It aims to develop and validate innovative materials and technologies for the systemic improvement of the seismic behavior of Cultural Heritage assets. The death tolls brought about by recent catastrophes in
developing countries where many inhabitants lived in earthen dwellings (Gujarat, India 2001, Bam, Iran 2003 and Concepción, Chile 2010 Earthquakes, Tamil Nadu 2004 Tsunami) have brought about research studies aimed at improving earth construction in terms of strength, seismic resistance and speed of construction.
In comparison to the recent advances in research on stone and brick masonry, knowledge on the material properties and failure mechanisms of earthen Building construction is limited and scattered.
The research presented here by aims making a comparison of mechanical behaviour between different earth masonry material typologies, consisting of earth block masonry, rammed earth and cob.
It has been shown in fire tests that polypropylene fibres reduce or avoid explosive spalling of high performance concrete. In the critical temperature ränge up to 300 °C the permeability of HPC increases by using polypropylene fibre. Due to this the water vapour, which is the main reason for explosive spalling, can escape. There exist different theories in the literature conceming the micro structural mechanisms, which cause an increase in the permeability. Within the framework of an internal research project at BAM an innovative methodology was developed for experimental verifying of existing theories and to get new insights into this problem The methodology used is unique and has been undertaken here for the first time. This consists of the combination of acoustic emission and ultrasonic measurement during temperature loading and the non-destructive micro structural analysis of cooled down samples with the aid of micro X-ray computed tomography. For the validation of the nondestructive test methods scanning electron microscopic images of prepared samples were undertaken. The results show that due to the thermal decomposition of the polypropylene fibres micro canals emerge. These are connected due to a simultaneous micro cack formation.
We studied Brillouin gain spectrum characteristics in dispersion-shifted fibers having compound GeO2-doping compositions in the fiber core to realize simultaneous measurement of distributed strain and temperature. Due to various dopant concentration alongside the radius of tested nonzero dispersion-shifted fibers several multiple Brillouin scattering resonances were observed in the stimulated Brillouin spectra arose through backscattering on higher acoustic modes which propagated along the fiber axis. As a result of the varying acoustic velocities, the Brillouin resonance peaks featured different temperature coefficients which can be used to accomplish the simultaneous measurement of fiber strain and temperature. We presented our first measurement results for NZDS Fujikura and LEAF Corning fiber and discussed the superior sensory suitability of the former fiber types.
Monitoring of fire damage processes in concrete by pore pressure and acoustic emission measurements
(2011)
This paper presents the combined use of acoustic emission (AE), gas pore pressure and temperature measurements (PT). The simultaneous application of both techniques represents a new methodology in the context of fire spalling and contributes to a better understanding of the mechanisms of fire spalling, particular with regard to the interaction of micro cracking and pore pressure evolution. The study presents fire tests on normal strength concrete specimens with and without reinforcement at ISO Standard fire and at hydrocarbon (HC) fire. Supported by AE-analysis, it can be shown that due to the higher heating rate of the HC-fire in comparison to the ISO Standard fire the damage processes inside the concrete during the exposure are increased combined with augmenting the concrete permeability. As a consequence lower pore pressures were measured. However, despite the lower pore pressures, explosive spalling was observed.
Im Vortrag wird neben der apparativen Prüftechnik das allgemeine methodische Vorgehen für Modell-Verschleißuntersuchungen im Bereich des partial slip vorgestellt. Im Detail wird für Dental-Implantat-Werkstoffe eine Rangfolge aufgestellt, die vergleichend die Verschleißresistenz unterschiedlicher Ti-basierter Werkstoffe zeigt. Wird durch die Kaubewegung eine mehrachsige Beanspruchung in die Kontaktflächen der Schraubverbindung eingeleitet, kann durch partial slip im Randbereich dieser Kontaktfläche ein Verschleißprozess initiiert werden, der die Lockerung des Implantats begünstigt. Eine gute Verschleißresistenz verhindert oder schiebt die vorzeitige Lockerung hinaus.
Um das Werkstoffverhalten in Bezug auf eine vorzeitige Lockerung der Implantatkrone bei geschraubten zweiteiligen Implantaten zu charakterisieren, wurden zylindrische Probekörper unter partial slip Fretting-Bedingungen mit Zyklenzahlen bis n = 200 000 beansprucht. Die Frequenz der aufgebrachten Tangentialkraft betrug 2 Hz, um die Kaubewegung zu simulieren.
Die tribologischen Untersuchungen wurden auf einem Eigenbau-Tribometer mit der Kontaktgeometrie „gekreuzte Zylinder“ durchgeführt. Die zylindrischen Proben wurden aus den Werkstoffen Titan Grade 4 und der Ti-Legierung Ti6AI4V gefertigt. Ein Teil dieser Ti-basierten Proben wurde oberflächengehärtet. Die bisher erzielten Ergebnisse zeigen, dass die oberflächenbehandelten Proben dazu neigen, unter der Belastung die Kontaktfläche zu vergrößern. Dies deutet auf einen Effekt bekannt als „junction growth“ und damit auf eine erhöhte Versetzungsbeweglichkeit der randschichtgehärteten Proben hin. Einen Einfluss der Zwischenstoffe konnte nicht nachgewiesen werden.
Mechanisms of degradation of concrete by external sufate ions under laboratory and field conditions
(2011)
The durability of concrete is a major challenge for the construction, which devotes one third to one half of its annual investment to building maintenance. The lack of fieid data regarding concrete durability, especially in the case of exposure to Sulfate ions (“sulfate attack”) makes it dijficult to determine the appropriate fest methods andperformance criteria. Additionally, the increased use of sustainable blends (cement with mineral admixtures, typically slag from the iron industiy) suffers from a lack of experience regarding their long-term performance. Most results for sulfate resistance are derived from accelerated laboratoiy tests xvhere performance criteria are based only on macroscopic properties, especially expansion. To fill this gap and better widerstand the mechanisms of sulfate attack under real conditions, a parallel study of laboratoiy micro-concrete and fieid concrete samples under sulfate exposure was undertaken, focussing on microstructural changes in addition to the conventional macroscopic characterisation.
Four exposure regimes were designed in the laboratoiy: full immersion (ponding), pH-control, semi-immersion and wet/diy cycles. Pure Portland blends and slag blends witli high level of slag replacement (70 wt.-%) were investigated.
The exposure regime has been found to play a major role in the damage process. In ponding conditions, the damage process takes place in three stages characterised by a first period of induction, followed by surface damage thatfinally extends to the bulle of the material. Paradoxically, the w/c-ratio does not seem to have much impact on the ionic transport phenomena but might be more decisive in the microstructure mechanical strength against local stresses. The slag blends, considered as sulfate resistant in ponding exposure, revealed badperformances under wet/diy cycles. This beliaviour was attributed to poor proper physical resistance of the slag hydrates against diying.
The fieid concretes selected for the comparison with the laboratoiy cases were partially buried in a sulfate-enriched soil in Argentina. A pure Portland blend and a slag blends with high level of slag replacement (80 wt.-%) were investigated. The submerged part of the samples could be compared to the laboratoiy ponding exposure, wliile the upper layer of the samples subjected to weathering could be compared to the laboratoiy wet/diy cycles exposure. The fieid obsen’ations tend to confirm the laboratoiy results and validate the fest settings.
It has been underlined that a direct relationship between damage (e.g.; cracking/expansion) andphase assemblage was not evident. However, the study highlights that sulfate combination with the hydrates of the cement (e.g.; C-S-H) and with those of the slag would play a rote in the initiation of the expansion, which would be attributed to a swelling of the hydrates or to the precipitation offine ettringite after the Saturation level in sulfate of the hydrates has been reached.
Mehr als 25 Jahre nach dem ersten Einbau eines sogenannten Fahrbahnüberganges aus Asphalt und nach nunmehr 13-jähriger Erfahrungen mit den gütesichernden Maßnahmen des technischen Regelwerks in Deutschland kann eine insgesamt positive Bilanz gezogen werden. Diese Ausführungsvariante der Bauart flexibler Fahrbahnübergang hat mittlerweile einen akzeptierten Platz auf dem Gebiet der Brückenausstattung für Bauwerke mit einer freien Dehnlänge bis zu 30 m eingenommen. Die generelle Bewährung ist aktuelle Motivation, durch stoffliche und konstruktive Weiterentwicklungen die bauartbedingten Vorteile in einen größeren Anwendungsbereich zu überführen. Die baurechtliche Grundlage dafür bilden die neuen europäisch harmonisierten Zulassungsregelungen. Erste Erfahrungen aus der versuchstechnischen Bewertung neuartiger Ausführungsvarianten werden vorgestellt.
Die Kombination elektrochemischer und computertomographischer Untersuchungs-Verfahren bietet die Möglichkeit, elektrochemische Messungen zerstörungsfrei verifizieren und richtig interpretieren zu können. Die Ermittlung der durch Lochkorrosion geschädigten Stahloberflächen ermöglicht es Probekörper zu entwickeln, die ein der Praxis entsprechendes Schadensbild aufweisen. Ein weiterer Vorteil stellt sich in der Minimierung der Probenmatrix dar. Die klassische Versuchsdurchführung erfordert die Zerstörung von Proben nach jeder Vorschädigungsstufe. Dies kann durch den Einsatz der Computertomografie vermieden werden. Die elektrochemischen Messwerte können flächenbezogen ermittelt werden, solange sich die Korrosionserscheinungen vollständig innerhalb des durch die CT abgebildeten Untersuchungsbereiches befinden.
Rising Prices of nickel and molybdenum in the past few years have led to unprecedented interest in Substitution of leaner-content alloys for Standard 300-series austenitic stainless steels in a lot of applications. Due to the high prices of different alloying elements and to periodic large fluctuations that cause similar large fluctuations in the costs of using 300-series stainless steels; a lot of new materials entered the markets in Europe and also in the rest of the world. A big disadvantage consists in the fact that there are though corrosion results that, however, a direct comparison of the corrosion resistance of these new materials does not exist up to now or only incompletely. In this project comparative investigations were carried out and always one or several representatives of a material group were incorporated. These material groups are: Lean Duplex Stainless Steels, Manganese Alloyed Austenitic and Duplex Stainless Steels and Ferritic Stainless Steels. These materials were investigated in a lot of different test procedures and in different conditions focused on the application in civil engineering and common use. Beside the electrochemical investigations all materials were exposed in different surface States in the atmosphere, once in Coastal nearness and once in a city centre area. Other exposition tests with material Coupons where done in the atmosphere of indoor swimming pools and at the case of food processing machines were corrosion processes are caused by the cleaning procedure. First results are reported.
Reststoffe aus Kohlekraftwerken und der Metallurgie, wie Steinkohlen- und Braunkohlenflugasche, Hüttensand und Silikastaub werden bereits seit Jahren als puzzolanische und hydraulische Zusätze in Zementen, Mörteln und Betonen zur Optimierung der Eigenschaften eingesetzt. Dennoch gibt es weitestgehend ungenutzte Sekundärrohstoffquellen aus der Silikon- und Kieselsäureherstellung.
Der Beitrag beschreibt Untersuchungen zur Nutzung kieselsäurehaltiger Filterrückstände aus der industriellen Abwasserbehandlung für den Einsatz als Bindemittelkomponente. Die chemisch-mineralogischen Eigenschaften der Filterrückstände, beispielsweise ein hoher Gehalt an amorpher Kieselsäure sowie eine große spezifische Oberfläche, legen eine Nutzung als puzzolanischer Bindemittelbestandteil nahe. Deshalb müssen Möglichkeiten einer Nutzung als Zusatz in Kompositzementen, Bodenverbesserungsmitteln und Spezialbindemitteln untersucht werden. Im Beitrag wird über die Stoffcharakterisierung, den Nachweis der puzzolanischen Eigenschaften und den Einfluss des Filterrückstands auf die Eigenschaften von Zementmörteln berichtet.
Ganzheitliche Nachhaltigkeitsbewertung von Recyclingoptionen für mineralische Abbruchmaterialien
(2011)
Der Einsatz mineralischer Abbruchmaterialien und anderer Sekundärrohstoffe im Betonbau kann einen wesentlichen Beitrag zu einer nachhaltigen Ressourcenwirtschaft im Bauwesen leisten. Auf diesem Wege können diese Stoffe eine sinnvolle Verwendung finden und weitere umweltrelevante Auswirkungen (Ressourcenverbrauch, Emissionen) gemindert werden. In einem Teilprojekt des DAfStb/BMBFVerbundforschungsvorhabens „Nachhaltig Bauen mit Beton“ wurde das Einsatzpotenzial verschiedener Sekundärrohstoffe in Beton untersucht. Die Kernfrage ist, ob und inwieweit durch den Einsatz eines bestimmten Sekundärrohstoffs die Anforderungen nachhaltigen Bauens erfüllt werden. Zur Beantwortung dieser Frage wurde ein Bewertungskonzept mit einer ganzheitlichen Betrachtung von Nachhaltigkeitsaspekten ausgearbeitet. Die Ganzheitlichkeit umfasst dabei technische, ökologische und ökonomische Aspekte. Das Konzept wurde am Beispiel der bereits im Betonbau eingesetzten rezyklierten Gesteinskörnungen entwickelt. Die Bewertung erfolgt in vier Bewertungsschritten: I. Grundsätzliche Überlegungen, II. Vorteile für das nachhaltige Bauen, III. Alternative Bewertungswege und IV. Sensitivitätsanalysen.
Mörtel für den Neubau und die Instandsetzung sind seit vielen Jahrzehnten im Abwasserbereich für unterschiedliche Bereiche im Einsatz. Zumeist werden diese je nach Anwendungsbereich entsprechend der Vorgaben der Auftraggeber, den Erfahrungen der Hersteller und Verwender sowie den Empfehlungen von Interessenverbänden (z. B. DWA oder DVGW verarbeitet. Zugleich ist eine Reihe von adaptierbaren Regelwerken für ähnliche Produkte aus anderen Anwendungsgebieten verfügbar. Während die Regelwerke zum Schutz und zur Instandsetzung von Betonbauteilen bereits seit ca. 35 Jahren über den Deutschen Ausschuss für Stahlbeton und die Bundesanstalt für Straßenwesen entwickelt und fortgeschrieben werden und seit ca. 20 Jahren auch über ein Mandat der europäischen Kommission im CEN entsprechende Bauproduktnormen im Rahmen der EN 1504 erarbeitet wurden, wurde die Arbeit an einer Produktnorm für zementgebundenen Mörtel für den Bau und die Sanierung von Abwasserkanälen und -leitungen sowie Bauwerken in kommunalen Entwässerungssystemen und Kläranlagen erst im Jahr 2005 aufgenommen. Dieses Regelwerk wurde in Anlehnung an Bauprodukte für andere Anwendungsbereiche erstellt, berücksichtigt darüber hinaus aber die besonderen Anforderungen im Bereich der Abwasserkanäle und -leitungen.
Sustainable evaluation - concept to assess the applicability of secondary aggregates in concrete
(2011)
Nowadays there are several applications of mineral recycling materials and residues. At present an assessment method for the use of secondary raw materials, which considers sustainability aspects, does not exist. In the framework of the German DAfStb/BMBF research project “Sustainable Building with Concrete” an assessment concept was developed. It includes the following four assessment steps: I. Basic considerations, II. Advantages for sustainable construction, III. Alternative paths for application, and IV. Sensitivity analysis. The concept was developed on the basis of recycled concrete aggregates, which are already used according to German standards.
Afterwards, it was applied and verified by the evaluation of the utilisation of municipal solid waste incinerator bottom ashes (referred to MSWI bottom ashes).
Concrete technology was exposed to a rapid development during the last three decades. For the longest time in its history, concrete was considered as a three component System consisting of aggregates, which are bound by the hardened cement paste consisting of hydrated cement. Traditionally, the only way of adjusting the consistency of concrete was using well adjusted aggregates and grading curves and adding excess water to the concrete, accepting that the latter in return reduces strength and durability. During the last three decades, however, concrete has developed further from a three component System towards an (at least) five component system, since the use of mineral additions and Chemical admixtures has become state of the art. Both components are able to enhance the workability, the compactability, and the density of the microstructure with effects on strength, ductility and durability, while cement can be saved in parallel. Due to reasonable use of admixtures and additions, concrete can be designed to match mechanically high performance specifications. Traditionally, cement paste was considered the weakest component in concrete. Flowever, in modern concrete a good paste composition can yield highest performance, passing the role of the mechanical bottleneck towards the aggregates.
Many African countries face serious problems associated with the rapid growth of urban Population and the resulting demand for affordable building materials. In search for appropriate Solutions to improve the Situation, the “LightSHIP” project was initiated, whose aims were to identify the required product specifications, to evaluate possible approaches and ultimately to develop new Building materials for East Africa. It was concluded that these materials should be produced in Africa mainiy from local raw materials; prefabricated, easily transportable construction elements are to be preferred. It is therefore reasonable to focus on artificial stones and partition boards. To be Independent of imported cement, it is suggested to make use of volcanic rocks, which are abundant in East African countries, for lime-pozzoian binders and geopolymers in the production of these construction elements. Future research activities should thus concentrate on assessment of the applicability of available volcanic rocks, the influence of their properties on the resulting binders and the design of appropriate binder-reinforcement-filler Systems.
The SPIN project
(2011)
Globally, cement and concrete experts are at the cutting-edge to sustainable, green, healthy but nonetheless high-performance concrete. In the present age, concrete is not yet well established in Africa, which öfters the unique opportunity to build up a cement and concrete market based on the highest available state of technology. As this industry needs high level expertise, a central issue in implementation of skilled technology is cross-linking research institutions and laboratories. It should not be neglected that concrete is a product with comparably low transport ranges, which means that an improved concrete market will mainly support the local economy without exceeding financial drains to the international market, thus fostering the fight against poverty, which is an urgent need in most African countries.
The SPIN project highlights recent developments in the field of cement and concrete research with impact on the local and global economy. Challenges, future developments and opportunities for the African construction industry are in the focus.
The SPIN project is funded by the European Commission (EC) and supported by the African, Caribbean and Pacific (ACP) Group of States under the project body of the ACP Science and Technology Programme. SPIN is acronym for “Spearhead network for Innovative, Clean and Safe Cement and Concrete Technologies”. The project aims to cross-link experts with industry and policy making bodies, aiming to establish sustainable cement and concrete construction in Africa.
Unter zyklischen Belastungen findet im Beton, wie bei anderen Materialien auch, ein Ermüdungsprozess statt. Im derzeitigen Erkenntnisstand zum Materialverhalten des heterogenen Betons gibt es gerade bei dessen Ermüdungsverhalten momentan noch viele nicht oder nicht ausreichend geklärte Fragestellungen. Deshalb befasst sich der vorliegende Beitrag mit der experimentellen Untersuchung des Ermüdungsverhaltens von Beton, speziell unter hochzyklischen Druckschwellbelastungen. Im Fokus der Untersuchungen stehen dabei die während der gesamten Lebensdauer im Materialgefüge ablaufenden Prozesse, die zu Veränderungen im Materialverhalten und schließlich auch bis zum Ermüdungsversagen führen können. Ziel ist es, eine möglichst realitätsnahe Beschreibung des im Materialgefüge ablaufenden Ermüdungsprozesses zu entwickeln.
OEMs perceive diamond-like carbon (DLC) coatings as part of a strategy for low frictional tribosystems. Especially the automotive industry anticipates a benefit in applying such coatings in association with the lightweight construction of mechanical parts, for instance in gears and engines. In previous investigations it was shown, that DLC, amorphous carbon (a-C) and tetragonal amorphous carbon (ta-C) coatings can be slip-rolling resistant at least up to ten million load cycles at Hertzian contact pressures P0max of 2.9 GPa lubricated by engine oil at 120°C, Further improvements in load carrying capacity up to P0mean of 2.62 GPa (FN= 5,000 N) were achieved with alternative, available Steel metallurgies as Substrates for thin film coatings. Additional factors, such as influences of the lubrication on the surface chemistry (additives and base oils), wear and friction behavior were investigated.
COMSOL Multiphysics® was used as a tool for the better understanding of the evolution of flow patterns during the induced ignition of gases. A simplified model was developed for the scope, by coupling the weakly compressible Navier Stokes module and the convection and conduction module. The current paper presents the results of the performed simulations.
Infrastructure is subject to continuous ageing. This has given life cycle management of infrastructure an increasing role. Reliable inspection and monitoring tools are therefore an increasing demand. A combination of different non-destructive test methods is often necessary to receive reliable results for material characterization,
flaw detection and the determination of component specific geometry parameters.
Regarding concrete structures thickness measurements are combined with flaw detection and additional information about reinforcement and tendon ducts is required.
Therefore, a multi-sensor measurement approach is necessary with a high degree of automation. Otherwise a time consuming succession of manual measurements has to be performed which would prevent practical applications. A modular control and data acquisition approach is described and the application of two different automated measurement devices is shown. The BetoScan system consists of a self-navigating
mobile robot. The system is especially designed for the investigation of reinforced concrete floors exposed to de-icing salts. The data acquisition of the OSSCAR system a multi-sensor scanner is similar to the robot approach. These different applications are based on a similar kernel allowing the modular use of different contact and noncontact sensors. The described general concept of multi-sensor data acquisition and data analysis presented here is not limited to the field of civil engineering applications.
For the last decades vibration based damage detection of engineering structures has become an important issue for maintenance operations on transport infrastructure. Research in vibration based structural damage detection has been rapidly expanding from classic modal parameter estimation to modern operational monitoring. Methodologies from control Engineering especially of aerospace applications have been adopted and converted for the application on civil structures. Here the difficulty is to regard to the specific environmental and operational influence to the structure under observation. A null space based damage detection algorithm is tested for its sensitivity to structural damage of a prestressed concrete road bridge. Specific techniques and extensions of the algorithm are used to overcome difficulties from the size of the structure which is associated with the number of recorded sensor channels as well as from the operational disturbances by a nearby construction site. It can be shown that for concrete bridges the proposed damage detection methodology is able to clearly indicate the presence of structural damage, if the damage leads to a significant change of the structural system. Small damage which do not result in a System change when not activated by loading, do not lead to a modification of the dynamic response behavior and for that cannot be detected with the proposed global monitoring method.
For the last decades vibration based identification of damage on civil Engineering structures has become an important issue for maintenance operations on transport infrastructure.
Research in that field has been rapidly expanding from classic modal Parameter estimation using measured excitation to modern operational monitoring. Here the difficulty is to regard to the specific environmental and operational influence to the structure under observation. In this paper, two methods accounting for statistical and/or operational uncertainties are applied to measurement data of a progressive damage test on a prestressed concrete bridge. On the base of covariance driven Stochastic Subspace Identification (SSI) an algorithm is developed to monitor and automatically compute confidence intervals of the obtained modal parameters. Furthermore, a null space based non-parametric damage detection method, utilizing a statistical χ2 type test is applied to the measurement data. It can be shown that for concrete bridges the proposed methodology is able to clearly indicate the presence of structural damage, if the damage leads to a change of the structural system.
Flame temperature (T), surface emissive power (SEP) of Liquefied Natural Gas (LNG) pool fires (d = 1 m, 6.1 m, 30 m) are investigated by CFD (Computational Fluid Dynamics) simulation and compared with experimental results.
Time averaged flame temperatures of T = 1320 K, T = 1298 K and T = 1281 K are obtained. Surface emissive power (SEP) of 55 kW=m2, 130 kW=m2 and 230 kW=m2 are predicted.
Most of the measurements of temperatures in large pool fires are indirect and present a number of complexities due to the interactions of convection, radiation and soot blockage. In the present work these influences for two organic peroxide [tert-butyl peroxybenzoate (TBPB) and tert-butyl peroxy-2-ethylhexanoate (TBPEH)] pool fires are analysed.
Thermocouple measured temperature in the clear flame zone i.e. combustion zone are found to be 250-400 K lower than from the thermographic measurements. The convective and radiative heat flux contributions from the fire on temperature measurements are discussed. CFD (Computational Fluid Dynamics) simulations have been performed for large pool fires and the predicted time averaged flame temperatures were found to be in qualitative agreement with
measurements due to the stoichiometric combustion model used in the present simulations.
For long-range measurements in geotechnical and industrial applications, distributed optical fiber sensors have become a tool of increasing importance throughout the past decade.
Classic deformation monitoring (performed by strain gauges etc.) and temperature monitoring (Pt100 and alike) deliver data from fixed, single spots of a structure; quasidistributed measurements (fiber bragg gratings) provide a Chain of discrete measurement points along a limited sensing length. In contrast, an opticai fiber connected to a device for distributed strain and temperature sensing (DTSS) will provide a continuous profile of strain and temperature - spatially resolved down to less than 1 m - over a ränge of several tens of kilometers.
In DTSS measurements, the nonlinear opticai effect of stimulated Brillouin Scattering (SBS) is employed: two light waves with a stable, tunable frequency offset are injected into opposite ends of the sensing fiber, where they will form a beat pattem, at which parts of the light will be scattered. By matching the frequency offset of the light waves to the propagation of acoustic fluctuation in the opticai fiber, a power transfer from one light wave to the other can be measured; since the acoustic propagation directly shifts with train and temperature of the fiber, these two quantities can be measured by tuning the light waves’ frequency offset.
How do application-related issues influence the reliability of fiber optic strain measurements?
(2011)
Fibre optic strain sensors are increasingly used and sensor systems are provided with specifications. Even if the performance is well specified, the strain characteristics of the sensor, strain transfer factor, mechanical stability under thermal influences, the performance of applied strain sensors can seriously differ from virgin sensor's the performance. The contribution will focus on issues that can deteriorate the sensor function or reduce the reliability of measurement results. Aspects are considered how to come to reliable strain measurements and how to validate strain measurements of applied sensors. Related to this topic, European activities like the recently started European COST TD1001 action, called (OfSeSa) will be presented.
Strain measurement in structures witli the purpose of long-term structurai health inonitoring must provide reliable inforination about the structure’s behavior over the whole period of use. The user must be sure that installed sensors are validated and work to the utmost satisfactiou. For this purpose, sensor Systems are tested using special facilities. Bccause it is not easy to characterize the strain transfer quality from the host structure into surface-applied strain sensors, a unique testing facility has been developed. Originally developed for fiber Bragg grating based sensors, the KALFOS facility (= calibration of fiber optic sensors) can also be used for electrical strain sensors.
Calibration ineasurements are referenced by unbinsed Digital Image Correlation (D1C) and Electronic Speckle Pattern Interferometer (ESPI) methods. The strain transfer behavior can experimentally be analyzed and investigated under combined thermal and mechanical loading conditions and allows revealing wealuiesses in couimonly used attachment methodologies. The deformation of all members (particularly the coating/substrate - adhesive combination) in the sensing area is physically independently gained and recorded. Results achievcd allow precise description of the strain transfer function, Validation of the longterm strain sensor characteristics, matching of specific measurement requirements with environmental conditions, and, moreover, the verification of Standards for use of strain sensors.
In der Bundes-Bodenschutz- und Altlasten-verordnung (BBodSchV) und im Arbeits-entwurf der Novellierung ist für den Wirkungspfad Boden-Grundwasser eine Sickerwasserprognose vorgesehen, um die Gefahren, die von kontaminierten Stand-orten für das Schutzgut Grundwasser ausgehen, beurteilen zu können. Bei der Sickerwasserprognose kann u.a. auf der Grundlage von Materialuntersuchungen im Labor die Quellstärke kontaminierter Ma-terialen ermittelt werden, welche dann bei Transportmodellierungen Berücksichtigung findet. Der Entwurf der Novellierung der BBodSchV sieht für die Ermittlung der Quellstärke den Übereinstimmungstest des Säulenversuchs nach DIN 19528 bis zu einem Wasser/Feststoff - Verhältnis (W/F) von 2 l/kg für anorganische und organische Stoffe (PAK) oder den Schüttelversuch nach DIN 19529 für anorganische Stoffe und E DIN 19527 für organische Stoffe auch jeweils mit einem W/F von 2 l/kg vor. Die Zulassung beider Elutionsverfahren setzt die Gleichwertigkeit der Ergebnisse beider Verfahren voraus. Im Folgenden werden die Ergebnisse des Vergleichs der Auslaugung von polyzyklischen aromat-ischen Kohlenwasserstoffen (PAK) aus unterschiedlichen Böden mit Hilfe beider Elutionsverfahren vorgestellt.
Elutionstests im Labormaßstab werden zur Ermittlung der Freisetzung von Schadstoffen aus Böden oder mineralischen Abfällen für die Verwertung in technischen Erdbau-werken durchgeführt. Sie sollen die Feldbedingungen möglichst realitätsnah wider-spiegeln und auch die Beurteilung der Freisetzung von Schadstoffen über längere Zeiträume ermöglichen. Aus diesem Grunde werden im Entwurf der novellierten BBodSchV neue Verfahren zur Eluatgewinnung aus den genannten Materialien festgeschrieben.