C80高性能混凝土高温试验及残余抗压强度研究  

Study on high temperature test and residual compressive strength of C80 high-performance concrete

作　　者：史英豪 Shi Yinghao(Shanxi Academy of Building Research Co.,Ltd.,Taiyuan Shanxi 030001,China)

机构地区：[1]山西省建筑科学研究院集团有限公司,山西太原030001

出　　处：《山西建筑》2024年第15期100-103,共4页Shanxi Architecture

基　　金：国家自然科学基金(51478290)。

摘　　要：对聚丙烯纤维(PP)体积掺量为0,0.2%的C80高性能混凝土立方体试块模拟火灾(高温)对比试验,进行了不同作用温度后混凝土试块的质量损失和残余抗压强度测试,分析了不同作用温度对混凝土的质量损失和残余抗压强度的影响。结果表明,聚丙烯纤维体积掺量0,0.2%两类混凝土的高温试验现象基本类似,均随着作用温度的升高,炉膛内有白色烟雾逸出,不同的是未掺聚丙烯纤维的部分混凝土试块出现不同程度的爆裂现象,而掺聚丙烯纤维混凝土试块均无爆裂现象发生;两类混凝土的质量损失随温度的升高呈现逐渐增加趋势,而抗压强度整体呈下降趋势;400℃前,混凝土的残余抗压强度降低幅度较缓慢;400℃后,混凝土的残余抗压强度下降较为显著,且其内部劣化损伤较为严重。The mass loss and residual compressive strength of C80 high performance concrete cubes with a volume of polypropylene fiber(PP)of 0 and 0.2%were tested by simulated fire(high temperature).The effects of different temperatures on mass loss and residual compressive strength of concrete were studied.The results show that the high temperature test phenomena of 0 and 0.2%polypropylene fiber are basically similar,and white smoke escapes in the furnace with the increase of the working temperature.The difference is that some of the test blocks without polypropylene fiber have different degrees of explosion,while none of the test blocks with polypropylene fiber.With the increase of temperature,the mass loss of the two types of concrete increases gradually and the compressive strength decreases as a whole.Before 400℃,the reduction of residual compressive strength of concrete is relatively slow;after 400℃,the decrease of residual compressive strength is more significant,and the internal deterioration damage of concrete is more serious.

关 键 词：高强高性能混凝土 聚丙烯纤维 高温试验 质量损失 残余抗压强度 

分 类 号：TU528[建筑科学—建筑技术科学]