Perti-nent discussion including authors ’ closure, if any, will be published in the May-June 2006 ACI Materials Journal if the discussion is received by February 1, 2006. Although there are several procedures predicting concrete compressive strength, reliable methodologies involve either extensive testing or voluminous databases. This paper presents a simple and efficient procedure to evaluate the activation energy and the rate constant of concrete. These two parameters can be used for a rapid prediction of the mechanical properties of concrete and particularly the evolution of compressive strength. They also allow separation of effects due to physical phenomena such as humidity loss. The procedure uses an experimentally-determined parameter called “hardening time ” as an indicator of equivalent maturity when comparing two hardening profiles. Test results from specimens of six concrete types validate the approach

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