高温后掺辅助胶凝材料的橡胶混凝土力学强度与损伤机制  

Mechanical Strength and Damage Mechanism of Rubber Concrete with Supplementary Cementitious Materials after High-Temperature

作　　者：周博文 郑泽中 马乾坤 黄文杰 张智雲 张继承[1] ZHOU Bowen;ZHENG Zezhong;MA Qiankun;HUANG Wenjie;ZHANG Zhiyun;ZHANG Jicheng(School of Urban Construction,Yangtze University,Jingzhou 434023,China;Qianjiang Water Resources Development Co.,Ltd.,Hangzhou 310000,China)

机构地区：[1]长江大学城市建设学院,荆州434023 [2]钱江水利开发股份有限公司,杭州310000

出　　处：《硅酸盐通报》2025年第2期447-454,462,共9页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(51778065)。

摘　　要：为探究高温后橡胶混凝土(RC)的力学强度退化特性,对掺加不同辅助胶凝材料(SCM_(S))的RC在高温作用下的质量损失、抗压强度、劈裂抗拉强度、抗折强度进行测试,并分析温度和SCM_(S)对RC强度的影响。研究表明,随着温度升高,各组RC试件的颜色缓慢由深变浅,并伴随不同程度的裂缝、剥落和质量损失,800℃时RC严重劣化。RC的质量损失率在700℃时达到峰值。橡胶颗粒和SCM_(S)在200℃前改善了RC的破坏模式,提高了RC残余强度,但在400℃后,RC力学强度急剧下降。扫描电子显微镜分析表明,高温导致RC内部孔隙和裂缝增多,微观结构的劣化是RC宏观力学强度退化的主要原因。基于试验数据,建立了温度与RC抗压强度、劈裂抗拉强度及抗折强度损失率之间的函数公式,为RC的高温性能研究提供了理论支持。In order to explore the mechanical strength degradation characteristics of rubber concrete(RC)after high-temperature,the mass loss,compressive strength,splitting tensile strength and flexural strength of RC with different supplementary cementitious materials(SCM_(s))under high-temperature were tested,and the effects of temperature and SCM_(s)on RC strength were analyzed.The results indicate that as the temperature increases,the color of RC specimens gradually lightens from dark to light,accompanied by varying degrees of cracking,spalling,and mass loss,with severe deterioration occurring at 800℃.The mass loss rate of RC peak at 700℃.Rubber particles and SCM_(s)improve the failure mode of RC and enhance residual strength before 200℃,but mechanical strength of RC sharply declines after 400℃.Scanning electron microscopy analysis reveals that high-temperature leads to the increase of internal pores and cracks in RC,and the deterioration of the microstructure is the main cause for the degradation of macroscopic mechanical strength of RC.Based on the experimental data,functional formulas have been established between temperature and the loss rates of cubic compressive strength,splitting tensile strength,and flexural strength,providing theoretical support for the study of high-temperature performance of RC.

关 键 词：橡胶混凝土 辅助胶凝材料 高温 损伤机制 强度退化 函数公式 

分 类 号：TU528[建筑科学—建筑技术科学]