关键词: 抗冲磨混凝土, 抗裂, 活化能, 等效龄期, 温度历程

Abstract:

Equivalent age method is mainly used to predict compressive strength of concrete under actual temperature, but reports on its application in prediction of tensile strength and elastic modulus are rarely found. In order to further improve related test method and verify its applicability in calculation of the mechanical properties under actual temperature, through measuring adiabatic temperature rising of anti-abrasion concrete, the temperature matching history curve was obtained by establishing a model of actual engineering. Taking three kinds of anti-abrasion concrete with different activation energy (FA, FAS, EA) as the test object, the ASTM C 1074-04 method was used to measure mortar's activation energy. And then based on the Arrhenius equation, the equivalent age of concrete under temperature match curing (TMC) process was calculated. In combination with the gradual model of tensile strength and elastic modulus under standard curing, the mechanical properties under actual temperature history were obtained. The test results are consistent with the measured results under TMC.

Key words: anti-abrasion concrete, crack-resistance, activation energy, equivalent age, temperature history