纳米和纤维增强水泥基材料耐高温性能及机理研究进展  

Research Progress on High-temperature Resistance and Mechanism of Nano-Fiber reinforced Cement-based Materials

作　　者：代小兵 陈静 黄煜镔[3] DAI Xiaobing;CHEN Jing;HUANG Yubin(School of Materials Science and Engineering,Chongqing University,Chongqing 400045;Beijing Jianheng Xingda Engineering Quality Inspection Co.,Ltd.,Beijing 100039;School of Civil Engineering,Chongqing University,Chongqing 400045)

机构地区：[1]重庆大学材料科学与工程学院,重庆400045 [2]北京建恒兴达工程质量检测有限公司,北京100039 [3]重庆大学土木工程学院,重庆400045

出　　处：《公路交通技术》2023年第2期52-59,共8页Technology of Highway and Transport

基　　金：青海省科技计划项目(2021-ZJ-733)。

摘　　要：为提高混凝土的耐高温性能,基于国内外众多学者的试验研究和理论分析,总结了纤维和纳米混凝土的高温劣化机理,并综述了纤维和纳米粒子增强水泥基复合材料耐高温性能的研究进展。分析表明:1)混凝土高温爆裂现象与蒸汽压力机理、热应力机理以及热开裂机理有关;2)混杂纤维可降低基体各部分之间的温差、释放蒸汽压力等,从而有效提高混凝土的结构高温稳定性;3)纳米粒子通过优化微观结构有助于增强水泥基体的耐高温性能;4)纤维和纳米粒子共同作用有助于进一步提高水泥基材料耐高温性能。该结论可为混凝土耐高温性能和高温试验明确研究方向提供参考。In order to improve the high-temperature resistance of concrete,based on the experimental research and theoretical analysis of many scholars at home and abroad,the high-temperature degradation mechanism of fiber and nano-concrete is summarized,and the research progress of high-temperature resistance of fiber and nano-particle reinforced cement-based composites is summarized.The analysis shows that:1)The high temperature cracking phenomenon of concrete is related to the steam pressure mechanism,thermal stress mechanism and thermal cracking mechanism;2)The hybrid fiber can effectively improve the high temperature stability of concrete structure by reducing the temperature difference between various parts of the matrix,releasing the steam pressure,etc;3)Nanoparticles can help to enhance the high temperature resistance of the cement matrix by optimizing the microstructure,The combined action of fiber and nano-particles can further improve the high-temperature resistance of cement-based materials;4)This conclusion can clarify the further research direction for the high temperature resistance performance and high temperature test of concrete.

关 键 词：水泥基材料 耐高温 纤维 纳米粒子 

分 类 号：U414[交通运输工程—道路与铁道工程]