The influence of wet curing condition in early ages on the strength of concrete was studied in this paper. The concrete cured under 20°C and high-temperature conditions in early ages was discussed. As the results of both temperature conditions, the shorter wet curing period in early ages, the more water was evaporated from concrete. For the case of the shorter wet curing, the strength of concrete was lowered when some degree of the water evaporation was exceeded. The measurements of X-ray diffraction analysis show that the reaction of C3S of cement was lowered when the water was evaporated more from concrete.
