KINETIC CHARACTERISTICS OF ASTM C1260 TESTING AND ASR-INDUCED CONCRETE DAMAGE

摘要

Most laboratory testing of concrete and mortars for Alkali-Silica Reaction (ASR) involves getting information regarding whether or not deleterious expansions could be expected for the concrete in service. The information gathered in this way does not address how much time will pass until significant damage might occur in the concrete in question. This paper explores correlations between rates of reaction determined from fitting an expression of the Kolmogorov-Avrami-Mehl-Johnson equation to ASTM C1260 data and the onset of cracking in concretes in service, and large concrete specimens stored outdoors. The data from the onset of cracking in field structures was gathered from field observations, and for the outdoor concrete specimens is defined by the point in time when expansions of 0.04% were achieved. Statistically significant correlations exist in these evaluations, which suggest that not only can relative potential for ASR be evaluated by existing laboratory tests, but that information about the time to damage in the field concretes may also reside in the information obtained from these tests.