摘要
通过对聚乙烯醇(PVA)纤维和聚丙烯(PP)纤维两种合成纤维混凝土进行200、500℃高温处理,利用扫描电镜(SEM)及其实时拉伸测试系统,探究纤维混凝土在热力作用下,混凝土内部微结构与力学性能的演变关系。结果表明:PVA纤维、PP纤维的加入,有利于混凝土高温后抗拉性能的提高;弹性模量高的PVA纤维相比于弹性模量低的PP纤维对混凝土抗拉伸性能提升更好;温度从20℃变化至500℃,纤维混凝土试件的抗拉强度先上升后下降。
The polyvinyl alcohol(PVA)fiber and polypropylene(PP)fiber synthetic fiber concrete were treated at 200℃and 500℃respectively.Scanning electron microscope(SEM)and its real-time tensile testing system were used to explore the evolution relationship between the internal microstructure and mechanical properties of fiber concrete under thermal action.The results show that the addition of PVA fiber and PP fiber is beneficial to the improvement of tensile properties of concrete after high temperature.Compared with PP fiber with low elastic modulus,PVA fiber with high elastic modulus can improve the tensile property of concrete better.When the temperature changes from 20℃to 500℃,the tensile strength of the fiber reinforced concrete specimen first increases and then decreases.
作者
葛晨
杨鼎宜
张军
GE Chen;YANG Dingyi;ZHANG Jun(Yangzhou Polytechnic Institute,Yangzhou 225127,China;Yangzhou University,Yangzhou 225127,China)
出处
《混凝土》
CAS
北大核心
2022年第7期53-58,66,共7页
Concrete
基金
国家重点研发计划(2018YFD1101002,2016YFB0303104)
江苏省建设系统科技项目(2020ZD40)
扬州市科技计划项目(YZ2019047,YZ2019125)。
关键词
纤维混凝土
高温
微结构
力学性能
fiber concrete
high temperature
microstructure
mechanical property