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  • Recknagel, Christoph (107)
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Offenporiger Asphalt - Porenstrukturanalyse - Entwicklung von Mess- und Auswerteverfahren zur Strukturaufklärung (2009)
Recknagel, Christoph
Offenporiger Asphalt - Porenstrukturanalyse - Untersuchungsergebnisse zur quantitativen Strukturaufklärung, Exponat: Modell einer CT-Messkonfiguration zur Strukturaufklärung von Asphalten (2009)
Recknagel, Christoph
Strukturanalyse von offenporigen Asphalten (2010)
Recknagel, Christoph
Joint sealing systems for pavements - A new approach towards a performance related evaluation of capability and durability (2010)
Recknagel, Christoph ; Pirskawetz, Stephan
Joint sealants influence decisively the performance and service life of pavements although they account for only a small fraction of the total investment. Motivated by the damages observed and the resulting, increasing maintenance efforts, the Federal German Government recognizes the need for performance-evaluated joint sealing systems with improved capability (fitness-for-purpose) and durability. A literature study showed that an identification of the actual mechanical system behavior under realistic loads as well as a prediction regarding the durability (fatigue, climatic effects) of joint sealing systems are either completely lacking in most of the relevant evaluation methods or have only been incompletely addressed previously. Furthermore an imbalance between commonly used test methodologies and the actual development status of modern modified sealing materials exists, i.e., the current test methods are not effective in evaluating the performance of tailor-made products. In this paper, the authors suggest a methodology to overcome the present situation. In contrast to the existing, predominantly empirical evaluation and selection of joint sealing materials and systems for pavements, the new approach is defined by verified performance under relevant and superimposed loads. This new approach is expected to allow a more engineered joint design. In addition to the adaptation of performance-oriented material identification tests, a special focus was placed on the development and installation of a complex test facility for the investigation of the service capability and durability of joint sealing systems in building constructions in general. This paper presents an attempt at the realization of this approach for pavement joints with the help of our new joint sealant test equipment utilizing a specific, adapted load function, which comprises cyclic movements (slow and fast acting), as well as crucial climatic exposures. The test data and its interpretation are discussed. For example, the actual mechanical behavior of the various joint sealing systems as well as the relevant maximum loading of cohesive and adhesive bonds can be deduced and used to differentiate between systems. Furthermore, information gained allows discrimination of products within the various joint sealing systems. The test results will also enable numerical simulations, e.g., of different joint designs or materials by finite element analysis. The fatigue behavior is detected by analysis of cycle-dependent changes of the mechanical system characteristics. The evaluation methodology further allows investigation of the degradation mechanisms of specific system failures and, thus, enables service life prediction by reproducing the performance of the complete system under realistic conditions. Constructional defects and material flaws can be activated and detected by the performance-related test methodology, thus identifying possible corrections to material selection and application procedures. The potential of the proposed evaluation methodology is discussed for several thermoplastic and reactive joint sealing systems.
Short communication: Fire risks of burning asphalt (2010)
Schartel, Bernhard ; Bahr, Horst ; Braun, Ulrike ; Recknagel, Christoph
Eyewitnesses describe burning pavement surfaces in extreme fire scenarios. However, it was believed that the pavement plays a negligible role in comparison to other items feeding such an extreme fire at the same time. The asphalt mixtures used differ widely, thus raising the question as to whether this conclusion holds for all kinds of such materials. Three different kinds of asphalt mixtures were investigated with the aim of benchmarking the fire risks. Cone calorimeter tests are performed at an irradiance of 70kWm-2. All three investigated asphalts burn in extreme fire scenarios. The fire response (fire load, time to ignition, maximum heat release rate and smoke production) is quite different and varies by factors of up to 10 when compared to each other. The fire load per mass is always very low due to the high content of inert minerals, whereas the effective heat of combustion of the volatiles is quite typical of non-flame retarded organics. The heat release rate and fire growth indices are strongly dependent on the fire residue and thus the kind of mineral filler used. Comparing with polymeric materials, the investigated Mastic Asphalt and Stone Mastic Asphalt may be called intrinsically flame resistant, whereas the investigated Special Asphalt showed a pronouncedly greater fire risk with respect to causing fire growth and smoke. Thus the question is raised as to whether the use of certain kinds of asphalts in tunnels must be reconsidered. Apart from the binder used, the study also indicates varying the kind of aggregate as a possible route to eliminate the problem.
Neue Verfahren zur chemisch-analytischen Ansprache von Adhesion-Agents auf Glasoberflächen (2010)
Recknagel, Christoph
Vergleichende Bewertung digi-optischer und konventioneller Verfahren zur Erfassung von konformfehlerbehafteter und intransparenter Reflexpartikel (2010)
Recknagel, Christoph
Performance assessment of construction sealants by complex testing - First steps of a complementary approach (2011)
Recknagel, Christoph
Performance - related testing of asphaltic plug joints in Germany (2000)
Recknagel, Christoph
Quality Improvement of Expansion Joint Systems by Performance Related Tests of System Behaviour (2002)
Recknagel, Christoph
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