摘要
目的为了系统掌握橡胶混凝土的动态性能,深化橡胶混凝土的研究。方法在常温和低温两种环境下,对四种橡胶掺量和两种橡胶粒径的橡胶混凝土试样;在不同应力速率下进行轴心抗压性能试验。结果低温下橡胶混凝土应力速率越高,试件最终的破损程度越严重;在不同应力速率下的破坏形态与常温情况相比,延性特征更明显,橡胶混凝土的强度增量与应力速率的对数呈线性关系;橡胶混凝土的动态弹性模量随应力速率的增加而提高;随着橡胶掺量的增加,不同应力速率下的橡胶混凝土峰值应变呈现先增加后减小的趋势,且低温条件下的橡胶混凝土峰值应变高于常温情况。结论从强度提高幅度及峰值应变两方面上看,低温下橡胶混凝土中橡胶掺量宜控制在10%~15%;橡胶集料粒径减小时,动态抗压强度略有降低,而峰值应变略有增大,但变化幅度并不明显。
In order to systematically understand the dynamic properties of crumb rubber concrete,four kinds of rubber content and two kinds of rubber particle size crumb rubber concrete specimens were tested under different stress rates at room temperature and low temperature.The results show that the ductility of crumb rubber concrete under different stress rates is more obvious than that under normal temperature.The greater the stress rate is,the more serious the ultimate damage is.There is a linear relationship between the strength increment of crumb rubber concrete and the logarithm of stress rate.The dynamic modulus of elasticity of crumb rubber concrete increases with the increase of stress rate.With the increase of rubber content,the peak strain of crumb rubber concrete increases at first and then decreases at different stress rates,and the peak strain of rubber concrete at low temperature is always higher than that at normal temperature.In terms of strength increase and peak strain,the rubber content in crumb rubber concrete should be controlled at 10%-15%at low temperature.When the particle size of rubber aggregate decreases,the dynamic compressive strength decreases slightly,while the peak strain increases slightly,but the change is not obvious.
作者
薛刚
董亚杰
曹美玲
高鹏
XUE Gang;DONG Yajie;CAO Meiling;GAO Peng(School of Civil Engineering,Inner Mongolia University of Science and Technology,Baotou,China,014010)
出处
《沈阳建筑大学学报（自然科学版）》
CAS
CSCD
北大核心
2021年第2期243-253,共11页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学基金项目(51868063)。
关键词
温度效应
橡胶混凝土
轴压
动态抗压强度
temperature effect
rubber concrete
axial compression
dynamic compressive strength
