@article{ThumannChristlmeierHartmeieretal., author = {Thumann, Maria and Christlmeier, Peter and Hartmeier, Michael and Kusterle, Wolfgang}, title = {Reduzierung von versinterungsbedingten Reinigungsarbeiten in Tunneldr{\"a}nagen durch Optimierung der Spritzbetonrezeptur}, series = {Beton}, volume = {68}, journal = {Beton}, number = {11}, publisher = {VERLAG BAU + TECHNIK}, pages = {416 -- 421}, abstract = {Die Drainageleitungen in nicht druckwasserhaltenden Tunnelbauwerken haben die Aufgabe, anfallendes Bergwasser zu sammeln und aus dem Bauwerk zu f{\"u}hren. In den Leitungen treten h{\"a}ufig Kalkablagerungen, so genannte Versinterungen auf, die zu einem Teil- oder Vollverschluss der Rohre f{\"u}hren k{\"o}nnen und die Ableitung des Bergwassers be- bzw. verhindern. Zur Vermeidung von Sch{\"a}den am Tunnelbauwerk sind regelm{\"a}ßige und aufwendige Unterhaltsarbeiten notwendig. Ein wichtiger Einflussfaktor bei der Entstehung von Versinterungen ist der Kontakt des Bergwassers mit zementgebundenen Baustoffen, wie z. B. mit Spritzbeton. Aus dem Spritzbeton kann Calciumhydroxid ausgelaugt werden, das f{\"u}r den Korrosionsschutz der Bewehrung erforderlich ist, aber die Entstehung von Versinterungen beg{\"u}nstigen kann. Im Rahmen eines Forschungsprojekts wurden zahlreiche Mischungszusammensetzungen auf ihr Auslaugverhalten untersucht und Spritzbetonzusammensetzungen mit einem m{\"o}glichst geringen Versinterungspotenzial entwickelt.}, language = {de} } @article{DingKusterle, author = {Ding, Yining and Kusterle, Wolfgang}, title = {Bemessungsmodell f{\"u}r Stahlfaserbeton}, series = {Beton- und Stahlbetonbau}, volume = {95}, journal = {Beton- und Stahlbetonbau}, number = {4}, publisher = {Ernst \& Sohn}, issn = {1437-1006}, doi = {10.1002/best.200000390}, pages = {225 -- 231}, abstract = {Die Bemessungsrichtlinien f{\"u}r Stahlfaserbeton folgen je nach Land unterschiedlichen Ans{\"a}tzen. Generell kann festgehalten werden, daß das Niveau dieser Bemessungsrichtlinien i. d. R. nicht mit den entsprechenden Normen f{\"u}r Stahlbeton vergleichbar ist. Die Richtlinien erreichen oft nur den Stand von Empfehlungen. Da die Bemessungstheorie des Stahlfaserbetons weit hinter der praktischen Anwendung zur{\"u}ckliegt, bedeutet dies in der Praxis, daß der Stahlfaserbeton oft nur f{\"u}r Bauteile, deren Tragf{\"a}higkeit als untergeordnet betrachtet wird, zum Einsatz kommt. Eine gute Bemessungsgrundlage f{\"u}r Faserbetone findet sich im DBV-Merkblatt "Bemessungsgrundlagen f{\"u}r Stahlfaserbeton im Tunnelbau". F{\"u}r die praktische Anwendung ist sie jedoch etwas zu kompliziert. Der Beitrag stellt ein neues Bemessungsmodell vor, das auf den Ergebnissen zahlreicher Biegezugversuche beruht, die f{\"u}r den verwendeten Stahlfasertyp statistisch ausgewertet wurden.}, language = {de} } @article{KellerGreimKusterle, author = {Keller, Helena and Greim, Markus and Kusterle, Wolfgang}, title = {27th Conference and Workshop on Rheology of Building Materials, Ostbayerische Technische Hochschule (OTH) Regensburg, Germany, March 7 - 8, 2018}, series = {Applied Rheology}, volume = {28}, journal = {Applied Rheology}, number = {2}, publisher = {De Gruyter}, doi = {10.1515/arh-2018-0005}, pages = {56 -- 58}, language = {en} } @article{GreimKusterle, author = {Greim, Markus and Kusterle, Wolfgang}, title = {23rd Conference and Workshop Rheology of Building Materials. Ostbayerische Technische Hochschule Regensburg, Germany March 12-13, 2014}, series = {Applied Rheology}, volume = {24}, journal = {Applied Rheology}, number = {3}, publisher = {Kerschensteiner}, doi = {10.3933/ApplRheol-24-3-61}, pages = {61 -- 62}, language = {en} } @inproceedings{KusterleThumann, author = {Kusterle, Wolfgang and Thumann, Maria}, title = {Pumpability of wet mixsprayed concrete with reduced clinker content}, series = {8th International Symposium on Sprayed Concrete : Modern Use of Wet Mix Sprayed Concrete for Underground Support, 11.- 14.06.2018, Trondheim, Norwegen}, booktitle = {8th International Symposium on Sprayed Concrete : Modern Use of Wet Mix Sprayed Concrete for Underground Support, 11.- 14.06.2018, Trondheim, Norwegen}, editor = {Beck, Thomas and Myren, Synn{\o}ve A. and Engen, Siri}, isbn = {978-82-8208-060-6}, abstract = {The research project „Advanced and Sustainable Shotcrete - ASSpC" aims at the improvement of sprayed concrete mix design regarding durability and sustainability. One possible improvement is to replace part of the clinker content in the binder with different supplementary cementitious materials. It is crucial that new mix designs fulfil the basic technical requirements on site concerning workability and early age development, too. One central issue of the project is to investigate which parameters influence the pumpability of sprayed concrete. Several test methods are used to determine the stability, tendency to segregation, bleeding and of course the consistency of concrete. An essential test method is a concrete sliding pipe rheometer (Sliper). This rheometer determines the pumping characteristics of concrete in the laboratory and on construction site. In comparison to other rheometers, the Sliper evaluates the rheological characteristics of the thin layer of paste which is lubricating the wall of the convey ing pipe. The paper presents the tests procedures in detail as well as first results from lab-tests and from site-tests with different advanced shotcrete mix-designs .}, language = {en} } @inproceedings{PetscharnigKusterle, author = {Petscharnig, Florian and Kusterle, Wolfgang}, title = {Die neue {\"o}bv-Richtlinie - Schutzschichten f{\"u}r den erh{\"o}hten Brandschutz f{\"u}r unterirdische Verkehrsbauwerke}, series = {Spritzbeton-Tagung, 11.-12.01.2018 Alpbach, Tirol}, booktitle = {Spritzbeton-Tagung, 11.-12.01.2018 Alpbach, Tirol}, pages = {1 -- 13}, language = {de} } @inproceedings{ParicGreimErhardtetal., author = {Paric, Ivan and Greim, Markus and Erhardt, Markus and Weißmann, Horst and Kusterle, Wolfgang}, title = {Untersuchung, Beurteilung und zeitnahe Aussteuerung der rheologischen Frischbetoneigenschaften von SVB}, series = {Rheologische Messungen an Baustoffen 2018. Tagungsband zum 27. Workshop und Kolloquium, 7. und 8. M{\"a}rz an der OTH Regensburg}, booktitle = {Rheologische Messungen an Baustoffen 2018. Tagungsband zum 27. Workshop und Kolloquium, 7. und 8. M{\"a}rz an der OTH Regensburg}, number = {1. Auflage}, editor = {Kusterle, Wolfgang and Teubert, Oliver and Greim, Markus}, publisher = {tredition}, address = {Hamburg}, isbn = {978-3-7469-1878-5}, pages = {154 -- 168}, language = {de} } @inproceedings{ThumannKusterle, author = {Thumann, Maria and Kusterle, Wolfgang}, title = {Durable and Sustainable Shotcrete - Requirements Concerning Workability and Early Strength Development}, series = {Shotcrete for Underground Support XIII : New Developments in Rock Engineering, Tunneling, Underground Space and Deep Excavation [Conference Sept. 3-6, 2017]}, booktitle = {Shotcrete for Underground Support XIII : New Developments in Rock Engineering, Tunneling, Underground Space and Deep Excavation [Conference Sept. 3-6, 2017]}, editor = {M{\"a}hner, Dietmar and Beisler, Matthias and Heimbecher, Frank}, abstract = {Nowadays there is a special need to develop "new" construction materials to reduce the environmental footprint of structures. Investigations focus on durability of constructions and the use of sustainable materials and the reduction of CO2 emission (especially of the binder). Constructions have to be sustainable and durable. This will lead to low maintenance work and costs as well as a good life cycle performance. The aim of the Austrian research project „Advanced and Sustainable Shotcrete - ASSpC" is to improve shotcrete mix design regarding durability and sustainability. There are different ways which may lead to success, one possibility is to replace part of the clinker content in the binder with supplementary cementitious materials. But it is crucial that new mix designs fulfil the technical requirements on site concerning workability and early age strength development, too. One central issue of the research project is to investigate how the pumpability of shotcrete can be determined in lab. At the moment there is no proven method available to measure the pumpability of shotcrete. Several test methods are used to determine the stability, tendency to segregation, bleeding and of course the consistency of concrete. Common test methods like the spread flow table and V-funnel flow time are used as well as two point test methods like the concrete rheometer eBT2 and Sliper. The segregation tendency is evaluated by the filter pressing test and the bucket setting test. Results from lab will be compared to results from site to define threshold values and parameters which describe the pumping characteristics of shotcrete base mix. In addition to that the early age strength development of the shotcrete mix design is investigated with the Minishot System designed by Sika. The shotcrete system is downscaled to a mini spray unit. In opposite to common test methods it is not necessary to mix the accelerator into the cement paste or mortar, but it will be added at the nozzle. The paste is sprayed by a downscaled nozzle and thus a realistic shear stress can be achieved. The paste is applied to a pulsment ultrasound spectrometer and the shear modulus development is measured continuously over time. The results can be linked to the strength development of shotcrete. The paper presents the tests procedures mentioned above in detail as well as first results with different shotcrete mix-designs.}, language = {en} } @inproceedings{ParicFleischmannGreimetal., author = {Paric, Ivan and Fleischmann, Florian and Greim, Markus and Kusterle, Wolfgang}, title = {The Determination of Rheological Properties of "High Slump Concrete" and SCC - the Advantages of a Modified Online Ball Measuring System}, series = {Rheologische Messungen an Baustoffen 2016, Tagungsband zum 25. Workshop und Kolloquium, 2. und 3. M{\"a}rz an der OTH Regensburg}, booktitle = {Rheologische Messungen an Baustoffen 2016, Tagungsband zum 25. Workshop und Kolloquium, 2. und 3. M{\"a}rz an der OTH Regensburg}, publisher = {tredition}, address = {Hamburg}, isbn = {978-3-7345-1313-8}, pages = {247 -- 264}, abstract = {In this paper a new rheometer for Self-Compacting-Concrete (SCC) and High-Slump-Concrete is presented. It is installed in a concrete mixer and provides results of the rheological properties immediately at the end of the mixing process. The intention was to find a way to evaluate the rheological properties automatically in the last step of the mixing process. Therefore, the rheometer immerses in the concrete and starts the measurement. At this time a correction of the mixture is still possible, before it is filled into the truck. In a first step, a laboratory rheometer was built and the measurement procedure was developed. In a second step, the laboratory rheometer was installed in a 75 1 concrete mixer and data were collected and evaluated. The accuracy is proven by comparing test results with a slightly different mix design.}, language = {en} } @incollection{LlanoTorreSernaCavalaroetal., author = {Llano-Torre, Aitor and Serna, Pedro and Cavalaro, Sergio H. P. and Buratti, Nicola and Stefan Bernard, E. and Boshoff, William P. and Zerbino, Ra{\´u}l L. and Pauwels, Hans and Kusterle, Wolfgang and Garcia-Taengua, Emilio and Vrijdaghs, Rutger and del Prete, Clementina and dos Santos, Karyne F. and Parmentier, Beno{\^i}t and Mazzotti, Claudio}, title = {Introduction and Background}, series = {Round-Robin Test on Creep Behaviour in Cracked Sections of FRC: Experimental Program, Results and Database Analysis}, booktitle = {Round-Robin Test on Creep Behaviour in Cracked Sections of FRC: Experimental Program, Results and Database Analysis}, editor = {Llano-Torre, Aitor and Serna, Pedro}, publisher = {Springer International Publishing}, address = {Cham}, isbn = {978-3-030-72735-2}, doi = {10.1007/978-3-030-72736-9_1}, pages = {1 -- 10}, abstract = {The absence of a standardised methodology to evaluate creep in the cracked state of fibre-reinforced concrete (FRC) hindered general comparisons and conclusions that could lead to significant advances in this topic. A coordinated effort was required to improve the knowledge on long-term behaviour of cracked FRC sections and assess the different testing methodologies available. The RILEM Technical Committee 261-CCF launched in 2015 the round-robin test (RRT) on creep behaviour in cracked sections of FRC program. This chapter includes the introduction and background to understand the realisation of this RRT. The main objectives as well as the limitations of the scope of the RRT are explained. The structure of the book is presented to provide a first overview of the book content. Finally, information about institutions involved as well as geographic distribution of RRT participants and number of specimens tested in the RRT is provided.}, language = {en} } @incollection{LlanoTorreSernaCavalaroetal., author = {Llano-Torre, Aitor and Serna, Pedro and Cavalaro, Sergio H. P. and Buratti, Nicola and Bernard, E. Stefan and Boshoff, William P. and Zerbino, Ra{\´u}l L. and Pauwels, Hans and Kusterle, Wolfgang and Garcia-Taengua, Emilio and Vrijdaghs, Rutger and del Prete, Clementina and dos Santos, Karyne F. and Parmentier, Beno{\^i}t and Mazzotti, Claudio}, title = {Statements and Conclusions}, series = {Round-Robin Test on Creep Behaviour in Cracked Sections of FRC: Experimental Program, Results and Database Analysis}, booktitle = {Round-Robin Test on Creep Behaviour in Cracked Sections of FRC: Experimental Program, Results and Database Analysis}, editor = {Llano-Torre, Aitor and Serna, Pedro}, publisher = {Springer International Publishing}, address = {Cham}, isbn = {978-3-030-72735-2}, doi = {10.1007/978-3-030-72736-9_9}, pages = {209 -- 220}, abstract = {A round-robin test (RRT) on creep behaviour in cracked section of fibre-reinforced concrete (FRC) was realised with the participation of 19 international laboratories from 22 institutions. The same concrete matrix was used to design two different FRC mixes with steel (SFRC) and macro-synthetic (SyFRC) fibres and to produce 451 FRC specimens. The use of 124 specimens for creep tests for one year following four main methodologies provided a huge database with more than 15,000 data. The main statements and conclusions derived from the RRT database analysis are summarised in this section. Note that the conclusions derived from this RRT are limited to the ranges of parameters, procedures and variables considered here and should not be extrapolated to other cases.}, language = {en} } @incollection{LlanoTorreSernaGarciaTaenguaetal., author = {Llano-Torre, Aitor and Serna, Pedro and Garcia-Taengua, Emilio and Vrijdaghs, Rutger and Pauwels, Hans and del Prete, Clementina and Buratti, Nicola and Zerbino, Ra{\´u}l L. and Kusterle, Wolfgang and Stefan Bernard, E.}, title = {Analysis of the RRT Results}, series = {Round-Robin Test on Creep Behaviour in Cracked Sections of FRC: Experimental Program, Results and Database Analysis}, volume = {34}, booktitle = {Round-Robin Test on Creep Behaviour in Cracked Sections of FRC: Experimental Program, Results and Database Analysis}, editor = {Llano-Torre, Aitor and Serna, Pedro}, publisher = {Springer International Publishing}, address = {Cham}, isbn = {978-3-030-72735-2}, doi = {10.1007/978-3-030-72736-9_8}, pages = {147 -- 207}, abstract = {The analysis of the results of the round-robin test (RRT) comprised many steps. The variation of the main variables such as the number of samples tested, environmental conditions, pre-crack level or creep index and mechanical performance were analysed among all the RRT participants. In addition, the main methodologies were independently analysed to search significances between the participant procedures. Analysis of the described procedures, test setups and equipment provided relevant information about such existent differences between participants in terms such as load configuration, boundary conditions or frames construction. The creep coefficient and crack opening rate (COR) parameters were defined and analysed. The complementary data number of fibres in the cross section was analysed to assess the influence in the long-term residual performance. Finally, the correlation between different fibre-reinforced concrete (FRC) specimens as well as the influence of ageing of concrete matrix were analysed.}, language = {en} }