APPARENT COEFFICIENT OF THERMAL EXPANSION FOR EVALUATING VOLUME CHANGES OF EARLY-AGE CONCRETE

摘要

Both laboratory and in-situ tests were carried out using normal concrete (NC) and the one having ahigh amount of ground granulated blast furnace slag in the binder (BC) to study the evolution ofapparent coefficient of thermal expansion (CTE), which yielded a three-stage development forearly-age concrete. The laboratory test showed that NC had similar apparent CTEs at stage Ⅱ and Ⅲdue to insignificant variation of internal relative humidity (RH), while BC had a further drop at stageⅢ related to a pronounced RH reduction. The in-situ test showed more deviation in NC than in BC.