不同龄期混凝土高温后力学性能研究  

Study on mechanical properties of concrete at different curing ages and high temperatures

作　　者：苗生龙[1] 张骞尹 袁广林 MIAO Sheng-long;ZHANG Qian-yin;YUAN Guang-lin(Xuhai College,China University of Mining and Technology,Jiangsu Xuzhou 221008,China;School of Mechanics and Civil Engineering,China University of Mining and Technology,Jiangsu Xuzhou 221116,China)

机构地区：[1]中国矿业大学徐海学院,江苏徐州221008 [2]中国矿业大学力学与土木工程学院,江苏徐州221116

出　　处：《消防科学与技术》2021年第3期330-333,共4页Fire Science and Technology

基　　金：江苏高校“青蓝工程”资助;江苏省高等学校自然科学研究项目(17KJB560014)。

摘　　要：为研究不同龄期混凝土高温后的力学性能变化,对不同养护龄期的混凝土设置不同的温度和继续养护时间,对其抗压强度和劈裂抗拉强度进行试验。结果表明:各龄期混凝土的抗压强度和劈裂抗拉强度随经历温度的升高基本呈下降趋势,但当温度不高于100℃,龄期不大于14 d时,其强度反而略有上升。混凝土经历相同温度情况下,高温时龄期越早,强度越低。随着高温后继续养护时间的增加,混凝土的强度逐渐恢复,且高温龄期越早,恢复程度越高,但强度恢复增幅逐渐降低。In order to study the variation of mechanical properties of concrete at different curing ages and high temperatures,the compressive strength and splitting tensile strength of concrete at different curing ages were tested by setting different temperatures and continuing curing time.The test results show that the compressive strength and splitting tensile strength of concrete at each age basically decrease with the increase of temperature,but when the temperature is not higher than 100℃and the age is not more than 14 days,the strength increases slightly.Under the condition that concrete experiences the same temperature,the earlier the age at high temperature,the lower the strength.With the increase of curing time after high temperature,the strength of concrete gradually recovers,and the earlier the high temperature age,the higher the recovery degree,but the increase of strength recovery gradually decreases.

关 键 词：混凝土龄期 高温 抗压强度 劈裂抗拉强度 

分 类 号：X913.4[环境科学与工程—安全科学] TU528.1[建筑科学—建筑技术科学]