页岩陶粒混凝土单轴受压力学性能研究

Study on Mechanical Properties of Shale Ceramsite Concrete Under Uniaxial Compression

为研究应变速率对页岩陶粒混凝土的受压力学性能的影响,以某实际桥梁桥面铺装工程为背景,开展了页岩陶粒混凝土立方体试样的单轴受压力学性能研究。以页岩陶粒取代率和应变速率为变化参数,制作了5种不同页岩陶粒取代率的混凝土立方体试样,采用多种不同的应变速率分别对不同的试样进行单轴压缩试验,对5种混凝土的试验结果进行对比分析。结果表明:5种混凝土的峰值应力都随着应变速率的增加而增加。页岩陶粒取代率、应变速率和动态强度因子三者之间呈对数关系,随着页岩陶粒取代率的增加混凝土峰值应力的提高幅度先减小后增大。当混凝土中页岩陶粒的取代率为100%时,混凝土的弹性模量受应变速率的影响最显著。

In order to study the effect of strain rate on the mechanical properties of shale ceramsite concrete under compression,the uniaxial mechanical properties of cubic samples of shale ceramsite concrete were studied on the background of an actual bridge deck pavement project.The shale ceramsite substitution rate and strain rate were used as the changing parameters.Five kinds of concrete cube samples with different shale ceramsite substitution rates were made,and the uniaxial compression tests were carried out on different samples with different strain rates,and the test results of five kinds of concrete were compared and analyzed.The results show that the peak stress of five kinds of concrete increases with the increase of strain rate.There is a logarithmic relationship between shale ceramsite substitution rate,strain rate and dynamic strength factor.With the increase of shale ceramsite substitution rate,the increase of peak stress of concrete first decreases and then increases.When the substitution rate of shale ceramsite is 100%,the elastic modulus of concrete is most significantly affected by the strain rate.