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Water distribution in beams damaged by alkali-silica reaction: global weighing and local gammadensitometry

Abstract : Within the framework of an experimental programme developed by the Laboratoire Central des Ponts et Chaussees (LCPC) and Electricite de France (EDF), in the aim of increasing knowledge on Alkali-Silica Reaction (ASR) and understanding the effect of water on ASR development in structures, two techniques have been designed to measure water content vs. time in large-scale concrete specimens. Global weighing variations are monitored on six 900 kg beams; and the gammadensitometry measurement allows evaluating water content profiles in the beams. These two complementary measurements serve to validate water content models and correlate the moisture gradient with measured deformations. The measurement principle, execution and qualification are first described. The accuracy of the weighing device is thus evaluated at 10 g, and the uncertainty of the gammadensitometry method is close to 0.4% of relative mass. The paper then presents the results of one-year monitoring conducted on one of these beams and proves the consistency of these methods. At last, it is shown that the square root of time kinetics allows a good representation of the global mass variations of the beams, and that the drying depth reaches between 80 and 100 mm after one year exposure.
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Stéphane Multon, E Merliot, M Joly, François Toutlemonde. Water distribution in beams damaged by alkali-silica reaction: global weighing and local gammadensitometry. Materials and Structures, Springer Verlag, 2004, 37 (269), pp.282--288. ⟨10.1617/13945⟩. ⟨hal-01727412⟩



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