混掺纤维增强橡胶混凝土断裂性能研究  

Research on fracture performance of hybrid fibers⁃reinforced rubber concrete

作　　者：孟雪飞 丁德鹏 黎晓辉 刘锋[2] 武念铎 MENG Xuefei;DING Depeng;LI Xiaohui;LIU Feng;WU Nianduo(China Railway 17th Bureau Group(Guangzhou)Construction Co.,Ltd.,Guangzhou 510663,China;School of Civil and Transportation Engineering,Guangdong University of Technology,Guangzhou 510006,China;Dongguan University of Technology,Dongguan 523808,China;China Construction Eighth Engineering Division Co.,Ltd.,Shanghai 200135,China)

机构地区：[1]中铁十七局集团(广州)建设有限公司,广州510663 [2]广东工业大学土木与交通工程学院,广州510006 [3]东莞理工学院,东莞523808 [4]中国建筑第八工程局有限公司,上海200135

出　　处：《建筑结构》2025年第5期41-46,共6页Building Structure

基　　金：国家自然科学基金面上项目(12072080)。

摘　　要：依托万环西路南延线项目,为探究混掺纤维对橡胶混凝土断裂性能的作用,对混掺钢-玻璃纤维增强橡胶混凝土进行了断裂性能测试。试验共设计了28组配合比,分析了钢纤维掺量、玻璃纤维掺量和玻璃纤维长度对橡胶混凝土断裂强度、起裂韧度和失稳韧度的影响规律。结果表明:混合掺入钢纤维和玻璃纤维后橡胶混凝土的断裂强度、起裂韧度和失稳韧度的最大提升幅度分别为64.9%、92.0%和118.4%,玻璃纤维的最优掺量通常在0.4%~0.6%范围内。在微裂缝发展阶段,数量多的玻璃纤维可以更好地限制微裂缝的发展,对起裂韧度的提升更明显;而在宏观裂缝出现后,钢纤维对宏观裂缝的抑制效果更明显,减缓宏观裂缝的发展速度,从而可以进一步提高失稳韧度,表明采用混掺纤维增强橡胶混凝土全周期的断裂性能措施可行。Based on the Wanhuan West Road South Extension Project,in order to explore the effect of hybrid fibers on the fracture performance of rubber concrete,fracture performance tests were conducted on hybrid steel⁃glass fibers⁃reinforced rubber concrete.A total of 28 mix proportions were designed for the experiment,and the influence of steel fiber content,glass fiber content and glass fiber length on the fracture strength,initial fracture toughness and instability fracture toughness of rubber concrete was analyzed.The results show that the maximum improvement in fracture strength,initial fracture toughness and instability fracture toughness of rubber concrete after mixing steel fiber and glass fiber is 64.9%,92.0%and 118.4%respectively.The optimal dosage of glass fiber is usually in the range of 0.4%to 0.6%.In the stage of microcrack development,a larger quantity of glass fibers can better limit the development of microcracks and significantly improve the initial fracture toughness.After the appearance of macroscopic cracks,the inhibitory effect of steel fibers on macroscopic cracks is more significant,slowing down the development speed of macroscopic cracks and further improving the instability fracture toughness,indicating that the use of hybrid fibers⁃reinforced rubber concrete for the full cycle fracture performance measures is feasible.

关 键 词：橡胶混凝土 混掺纤维 断裂性能 I型开裂 

分 类 号：TU528.57[建筑科学—建筑技术科学]