不同温-时影响下混凝土劈拉强度的试验研究

基于国内外高温、恒温时间对混凝土力学性能影响的研究较少,且实际受火后混凝土损伤检测技术缺乏的状况,为探讨高温-恒温时间-混凝土强度的相互关系,开展了混凝土高温-恒温时间-混凝土强度的研究。通过对混凝土试块的高温试验及对不同温度,不同恒温时间下混凝土劈拉强度试验,以得到温度、恒温时间、劈拉强度的耦合关系,建立高温后混凝土劈拉强度的计算公式。根据试验结果拟合了温度-恒温时间共同影响下混凝土劈拉强度的三维曲面。

EXPERIMENTAL RESEARCH ON THE SPLITTING TENSILE STRENGTH OF CONCRETE AT DIFFERENT TEMPERATURES AND TIME

Because little research has been done on the affection of high temperature and constant temperature time to concrete mechanical properties at home and abroad and the damage detection technology of fire-damaged concrete is lacking,high temperature test of concrete test is presented.Through the splitting tensile strength test of concrete at different temperature and different constant temperature time,the coupling relationship among temperature,constant temperature time and splitting tensile strength of concrete is enduced,and the formula of concrete splitting tensile strength after high temperature is established.Based on the results of test,three-dimensional surface of temperature,constant temperature time and splitting tensile strength of concrete is fitted.