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掺量依赖效应对橡胶集料混凝土力学性能的影响

作者：官庆发1，刘来宝2，张礼华2，陈晓强1，顾金戈3，蔡祥磊2

关键字：掺量,依赖,效,应对,橡胶,集料,混凝土,西南,

　
（1.西南科技大学 土木工程与建筑学院，四川 绵阳  621010；
2.西南科技大学 材料科学与工程学院，四川 绵阳  621010；
3.四川省第六建筑有限公司，四川 成都  610084）
    摘要：通过准静态单轴受压力学试验，研究了橡胶集料（RA）粒径的掺量依赖效应对橡胶集料混凝土（RuC）力学参数的影响，分析了不同RA掺量和粒径下RuC的应力-应变关系曲线。结果表明，随着RA粒径减小，RuC的应力-应变下降段曲线变缓，应力缓冲区和应变软化区扩大，并随着RA掺量的增加而更显著；RA粒径对RuC的受压峰值应力和峰值应变RIF的影响表现出显著的掺量依赖效应；随着RA粒径的增大，RuC的受压峰值应力和峰值应变RIF逐渐减小，并随着RA掺量的增加而更显著；RA粒径对RuC初始弹性模量的影响不具有掺量依赖效应。通过试验数据回归分析，提出了RuC受压峰值应力、峰值应变和初始弹性模量的橡胶集料影响因子（RIF）函数模型。
    关键词：橡胶集料混凝土；掺量依赖效应；力学性能；橡胶集料影响因子
    中图分类号：TU528.59        文献标识码：A        文章编号：1001-702X（2022）08-0106-06
 
Influence of content-dependent effect on mechanical property of rubberized concrete
GUAN Qingfa1，LIU Laibao2，ZHANG Lihua2，CHEN Xiaoqiang1，GU Jin'ge3，CAI Xianglei2
（1.School of Civil Engineering and Architecture，Southwest University of Science and Technology，Mianyang 621010，China；
2.School of Material Science and Engineering，Southwest University of Science and Technology，Mianyang 621010，China；
3.Sichuan Sixth Construction Co. Ltd.，Chengdu 610084，China）
    Abstract：Based on the quasi-static uniaxial compression test，the influence of content-dependent effect of RA particle size on mechanical parameters of rubberized concrete（RuC） is studied，and the stress-strain curves of RuC under different RA contents and particle sizes are analyzed. The results show that with the decrease of RA particle size，the descending portion of stress-strain curve become flat，and the stress-buffering area and strain-softening area expand，which is more obvious with the increase of RA content. It can be found that the effect of RA particle size on RIF of compressive peak stress and peak strain shows an obvious content-dependent effect. With the increase of RA particle size，the RIF of compressive peak stress and peak strain decrease gradually，and become more significant with the increase of RA content. In addition，it is found that the effect of RA particle size on initial elastic modulus of RuC has little content-dependent effect. Through the regression analysis of test results，the rubber aggregate influencing factor（RIF） function model of compressive peak stress and peak strain of RuC is proposed.
    Key words：rubber aggregate concrete，content dependent effect，mechanical properties，rubber aggregate influencing factor