Residual Strength for Concrete after Exposure to High Temperatures
An experimental research is performed on such strength as compressive strength and tensile strength for concrete after heating to temperatures of 100600℃. Some concrete specimens are standard concrete cylinders of 150 mm diameter×300 mm height, the others are cubes of 150×l50×l50mm, made with siliceous aggregate. The heated specimens are tested at heating rate of 5℃/min after they are cooled to room temperature. From the results of 63 specimens with two original unheated strengths, a formula for the strength of heated concrete varying with temperature is proposed. Through the regression analysis, the relationships of the mechanical properties with temperature are proposed to fit the test results, including the residual compressive strength and elastic modulus. In addition, the splitcylinder tests of 42 specimens are also carried out to study the relationship of splitting tensile strength with temperature. The experimental results show that the compressive strength of concrete after 200℃ -300 ℃ is increased with the increase of temperature and its critical temperature is around 400℃.
Temperature Compresslve strength.Elastic midulus.Concrele Tensile strength
Li Xiaoyong Bu Fanjie
College of Architecture North China University of Technology Beijing 100144,China
国际会议
青岛
英文
17-20
2010-10-28（万方平台首次上网日期，不代表论文的发表时间）