To investigate the stress resistance and constitutive relationship of Coral Sea Sand Concrete(CSSC)after exposure to high temperatures,30 test cubes measuring 150mm× 150mm× 150mm were created,with maximum temperature T and duration H as variable parameters.By conducting compressive tests on CSSC after high-temperature exposure,stress-strain curves were derived.Additionally,the impact of temperature T and constant temperature time H on the compressive strength,initial elastic modulus,volume expansion rate,and mass loss rate of CSSC was determined.The results show that the CSSC compressive test shows splitting failure after high temperatures,with the crack propagation severity of the test specimens escalating as temperature increases.As temperature rises,the compressive strength and elastic modulus of CSSC diminish.Specifically,at T=800 ℃,the compressive strength and elastic modulus of CSSC are reduced by 90.3％and 72.2％,respectively.The mass loss rate and volume expansion rate of the test block increase as the temperature elevation escalates.The stress-strain constitutive model of concrete material after high temperature is fitted,and the fitting results are in good agreement with the test data.
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