冲击荷载作用下橡胶混凝土抗压及抗裂性能试验研究  

Experimental study on compressive property and cracking resistance of rubber concrete under impact load

作　　者：冯万辉 麦家豪 郑俊鑫 杨远焕 杨永民 FENG Wanhui;MAI Jiahao;ZHENG Junxin;YANG Yuanhuan;YANG Yongmin(College of Urban and Rural Construction,Zhongkai University of Agriculture and Engineering,Guangzhou 510225,China;Guangdong Lingnan Township Green Building Industrialization Engineering Technology Research Center,Zhongkai University of Agriculture and Engineering,Guangzhou 510225,China;Institute of Sustainable Building and Energy Conservation,Zhongkai University of Agriculture and Engineering,Guangzhou 510225,China)

机构地区：[1]仲恺农业工程学院城乡建设学院,广东广州510225 [2]广东省岭南乡镇绿色建筑工业化工程技术研究中心,广东广州510225 [3]仲恺农业工程学院可持续建筑与节能研究所,广东广州510225

出　　处：《仲恺农业工程学院学报》2023年第3期26-31,46,共7页Journal of Zhongkai University of Agriculture and Engineering

基　　金：广东省基础与应用基础研究基金(2022A1515010008、2022A1515010853、2023A1515010870)、广州市科技计划项目(202201011086).

摘　　要：为了探究橡胶颗粒对混凝土抗压强度应变率效应的影响机理,采用直径为100 mm的分离式霍普金森压杆(Split Hopkinson pressure bar,SHPB)探究橡胶混凝土的动态抗压性能和应变率敏感性,并分析橡胶混凝土(橡胶掺量为细骨料体积的10%、20%和30%)与普通混凝土应变率敏感性差异的原因.试验结果表明,橡胶混凝土的动力增强系数随应变率的增加而增加.分析破坏模态可知,试验后所有试样的碎片粒径随着应变速率的增加而逐渐减小.在相近的应变率下,普通混凝土与橡胶混凝土相比具有更多数量的裂纹.因此,与普通混凝土相比,橡胶颗粒可以减缓损伤累积并增加变形滞后效应,从而增大了混凝土材料抗压强度的应变率敏感性.To explore the influence mechanism on the strain rate effect of concrete compressive strength for rubber particles,a split Hopkinson pressure bar(SHPB)with a diameter of 100 mm were used.The dynamic compressive performance and strain rate effect of rubber concrete(with the rubber content of 10%,20%,and 30%)were obtained.Besides,the reasons for the difference in strain rate effect between rubber concrete and ordinary concrete were analyzed.The experimental results showed that the dynamic increased factor(DIF)of rubber concrete increased with the increase of strain rate.Furthermore,the failure mode analysis showed that the particle size of all post-tested specimens gradually decreases with the increase of strain rate.At similar strain rates,ordinary concrete has more cracks than rubber concrete.Rubber particles can slow down damage accumulation and increase deformation hysteresis effect when compared to ordinary concrete,resulting in the increase of strain rate sensitivity for concrete compressive strength.

关 键 词：橡胶混凝土 动态力学性能 分离式霍普金森压杆 破坏模态 碎片粒径分布规律 

分 类 号：TU521.3[建筑科学—建筑技术科学]