Abstract
Abstract A new method involving a slight acceleration of curing is proposed to evaluate the sensitivity of a particular cement or particular mortars to DEF and consequent expansion. It can be used to determine the maximum concrete temperature below which the risk of DEF is minimal and acceptable. After a heat curing, the specimens were kept in lime-saturated water. On the seventh day, they were submitted to six daily thermal cycles (+50 to +10°C). Expansion is greater when thermal cycles are applied compared to control specimens. Therefore, the absence of expansion of some mortars submitted to thermal cycles enables us to accept the mix, even if the curing temperature is 90°C. This method has been applied successfully in mortar specimens. It is presently being applied on concrete specimens.
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