Assessment and prediction of drying shrinkage cracking in bonded mortar overlays |
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| Affiliation: | 1. Magnel Laboratory for Concrete Research, Department of Structural Engineering, Faculty of Engineering and Architecture, Ghent University, Technologiepark 904, B-9052 Zwijnaarde, Belgium;2. Research Group Electrochemical and Surface Engineering (SURF), Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium;3. PProGRess, Department of Geology and Soil Science, Faculty of Sciences, Ghent University, Krijgslaan 281 S8, B-9000 Ghent, Belgium;4. Strategic Initiative Materials (SIM), Technologiepark 935, B-9052 Zwijnaarde, Belgium;1. BATir Department, Université Libre de Bruxelles (ULB), Brussels, Belgium;2. Department of Civil Engineering, Katholieke Universiteit Leuven (KUL), Leuven, Belgium;1. Graduate School of Engineering, Muroran Institute of Technology, Hokkaido, Japan;2. Graduate School of Engineering, Hankyong National University, Ansung, South Korea;3. Department of Architecture, The University of Tokyo, Tokyo, Japan;4. Department of Architectural Engineering, Chungnam National University, Daejeon, South Korea |
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| Abstract: | Restrained drying shrinkage cracking was investigated on composite beams consisting of substrate concrete and bonded mortar overlays, and compared to the performance of the same mortars when subjected to the ring test. Stress development and cracking in the composite specimens were analytically modeled and predicted based on the measurement of relevant time-dependent material properties such as drying shrinkage, elastic modulus, tensile relaxation and tensile strength. Overlay cracking in the composite beams could be very well predicted with the analytical model. The ring test provided a useful qualitative comparison of the cracking performance of the mortars. The duration of curing was found to only have a minor influence on crack development. This was ascribed to the fact that prolonged curing has a beneficial effect on tensile strength at the onset of stress development, but is in the same time not beneficial to the values of tensile relaxation and elastic modulus. |
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