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Concrete cylinders with a design strength of 100 to 150 N/mm2 were subjected to thermal histories with different maximum temperatures simulating actual structures to examine the development of their mechanical properties. The tendencies of the mechanical properties of concrete subjected to a maximum temperature exceeding 45 to 60° C were found to significantly differ from those of concrete cured at lower temperatures. The authors thus propose a technique for estimating the compressive strength of concrete from the maximum curing temperature and effective age. We also report on the investigation of the applicability of conventional prediction equations to the evaluation of static modulus and splitting tensile strength using compressive strength.

Development of Mechanical Properties of Ultra-High-Strength Concrete Subjected to Early Heat Curing