(内蒙古科技大学土木工程学院， 包头 014000)

摘要: 为研究橡胶混凝土断裂韧度，以 C30 混凝土为基准混凝土，将橡胶颗粒的粒径、掺量以及试件的缝高比作为变量，制备混凝土试件进行楔入劈拉试验研究。 计算得到橡胶混凝土试件起裂韧度及失稳断裂韧度的变化规律。 结果表明:掺入橡胶后，混凝土的起裂韧度有明显降低，橡胶掺量越高降幅越明显，橡胶掺量为 5% ~ 15%的混凝土失稳断裂韧度大于基准混凝土；20%橡胶掺量的混凝土失稳断裂韧度略小于基准混凝土；缝高比相同时，掺粒径为 0. 3mm 橡胶颗粒的混凝土试件失稳断裂韧度高于粒径为 0. 6mm 的橡胶混凝土，表现出更好的断裂韧性；与起裂韧度相比，失稳断裂韧度与橡胶含量的非线性特征更加明显。

关键词: 楔入劈拉； 橡胶混凝土； 起裂韧度； 失稳断裂韧度

中图分类号: TU258 文献标志码:A 文章编号:1002￣848X(2022)02￣0115￣05

DOI:10. 19701 / j.jzjg.LS210007

Experimental study on fracture toughness of rubber concrete

 XUE Gang， DONG Yajie， YI Xiao， GAO Peng

(School of Civil Engineering， Inner Mongolia University of Science and Technology， Baotou 014000， China)

Abstract: In order to study the fracture toughness of rubber concrete， based on C30 concrete the particle size， content ofrubber powder and the joint height ratio of the specimens were used as variables to prepare concrete specimens for wedgesplit tensile test. The changing rules of the initial fracture toughness and the unstable fracture toughness of the rubberconcrete specimens were obtained. The results show that the initial fracture toughness of concrete decreases obviously afteradding rubber， and the larger the rubber content is， the more obvious the decrease range is. The instability fracturetoughness of rubber concrete with 5% ~ 15% content is higher than that of reference concrete， and the instability fracturetoughness of rubber concrete with 20% content is slightly lower than that of reference concrete. At the same joint heightratio， the instability fracture toughness of concrete specimens with a particle size of 0. 3mm is higher than that of theparticle size of 0. 6mm， showing better fracture toughness. Compared with the initial fracture toughness， the nonlinearcharacteristics of instability fracture toughness and rubber content are more obvious.

Keywords: wedge splitting and pulling； rubber concrete； initiation fracture toughness； instability fracture toughness

∗国家自然科学基金项目(51868063)。

第一作者:薛刚，博士，教授，硕士生导师，主要从事新型混凝土材料与结构研究，Email: xuegang-2008@ 126.com。

[引用本文] 薛刚，董亚杰，衣笑，等. 橡胶混凝土断裂韧性试验研究[ J]. 建筑结构，2022，52( 2):115￣119，126.XUE Gang， DONG Yajie， YI Xiao， et al. Experimental study on fracture toughness of rubber concrete [ J]. BuildingStructure，2022，52(2):115￣119，126.