Experimental study on mechanical property of concrete after high temperature suffered

Abstract：After heated by high temperature of 200～1000℃, the concrete samples were cooled down by water or itself.With RMT-150B servo-controlled testing machine, Brazilian tests and uniaxial tests were performed on these samples separately.The relations between temperature and longitudinal wave, compression strength, tensile strength, average modulus, as well as ultimate strain were studied in the paper.The experimental results show that with the increase of temperature, the compression strength, tensile strength, average modulus and longitudinal wave descend, while ultimate strain increases.The relations between temperature and compression strength, tensile strength can be indicated by exponential function.The relations between temperature and average modulus can be expressed by power function.Longitudinal wave, strength and average modulus are positive related, and there exist statistical relations among them.The cooling-method has little effect on compression strength, tensile strength, average modulus, ultimate strain and damage characteristic, they are not obvious.The results can offer a reference for predicting and estimating the stability and security of the concrete after burned, as well as an indication of its repair and reinforcement.

Keyword：concrete;high temperature;strength character;strain character;