改性废轮胎橡胶混凝土微观结构及其力学性能  

Interfacial microstructure and mechanical properties of waste tire rubber concrete modified

作　　者：孔慧 耿欧 朱思远[1] KONG Hui;GENG Ou;ZHU Siyuan(College of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221116,China;Key Laboratory of Environm Ental Impact and Structural Safety in Engineering,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学力学与土木工程学院,江苏徐州221116 [2]中国矿业大学江苏省土木工程环境灾变与结构可靠性重点实验室,江苏徐州221116

出　　处：《混凝土》2022年第11期152-155,159,共5页Concrete

基　　金：国家自然科学基金项目(51972337)。

摘　　要：通过普通混凝土、橡胶混凝土、硅烷偶联剂改性橡胶混凝土的对比试验,研究了硅烷偶联改性剂对废轮胎橡胶混凝土的抗压性能的改善效果;借助SEM、EDS等试验,揭示了硅烷偶联剂对废轮胎橡胶混凝土抗压性能影响的微观机制。结果表明:5%橡胶颗粒掺量的橡胶混凝抗压强度比普通混凝土抗压强度下降了13.2%,其水化产物中Si元素的分布有所改变;硅烷偶联改性剂的加入改变了橡胶混凝土的抗压性能、微观形貌及水化产物数量;使橡胶混凝土抗压强度提高8.2%;对于界面过渡区(ITZ)性能,硅烷偶联剂加入后,改性橡胶混凝土ITZ形貌致密,厚度减小,钙硅比降低,稳定性增加,C-S-H含量增加,Ca元素分布有所改变。Through the comparative experimen of ordinary concrete,rubber concrete and silane coupling agent modified rubber concrete,the improvement effect of silane coupling modifier on the compressive performance of waste tire rubber concrete has been studied,the microscopic mechanism of the influence of silane coupling agent on the compressive performance of waste tire rubber concrete was revealed by means of SEM,EDSexperiments.The results show that compared with ordinary concrete,the compressive strength of rubber concrete containing 5% rubber particles decreased by 13.2%,and the distribution of Si elements in the hydration products of rubber concrete was changed.The addition of silane coupling agent changes the compressive properties,hydration products and microstructure of the rubber concrete.The compressive strength of rubber concrete increased by 8.2%.As for ITZ,the thickness of ITZ between rubber particles and cement particles,its morphology becomes denser,the calcium-silicate ratio in ITZ declines,the microhardness and stability in ITZ increases,the content of C-S-H increases and the distribution of Ca is changed.

关 键 词：硅烷偶联剂 橡胶混凝土 力学性能 微观结构 界面过渡区 元素重分布 

分 类 号：TU528.01[建筑科学—建筑技术科学]