硅烷偶联剂对碱矿渣混凝土碳化侵蚀的抑制作用  

Controlling the Carbonation Degradation of Alkali-activatedSlag Concrete Using Silane Coupling Agent

作　　者：李静 李萍 林芳 李婷 LI Jing;LI Ping;LIN Fang;LI Ting(School of Management Engineering,Jiangsu Urban and Rural Construction College,Changzhou 213147,China;School of Materials and Chemical Engineering,Anhui Jianzhu University,Hefei 230601,China)

机构地区：[1]江苏城乡建设职业学院管理工程学院,江苏常州213147 [2]安徽建筑大学材料与化学工程学院,安徽合肥230601

出　　处：《材料科学与工程学报》2023年第3期497-501,共5页Journal of Materials Science and Engineering

基　　金：江苏城乡建设职业学院校级课题资助项目(XJZK21004);安徽建筑大学博士启动基金资助项目(2018QD49)。

摘　　要：为抑制碱矿渣混凝土碳化侵蚀,向碱矿渣混凝土中掺入硅烷偶联剂(SCA)研究SCA对混凝土碳化侵蚀深度和强度的影响,采用X射线衍射仪、氮吸附孔隙率分析仪和扫描电子显微镜表征硬化体的微观结构。结果表明,掺入0.1%SCA可显著减缓混凝土内的碳化侵蚀进程,使28d龄期的侵蚀深度由13.6降至6.4mm,偶联在水化产物表面的SCA基团可限制毛细管内CO_(3)^(2-)离子的扩散和运输。而分布在骨胶界面的SCA则形成了交联结构,提高了混凝土内的胶结性能,维持了试件的抗剪切特性,显著提高了混凝土试件的抗折强度,降低了因碳化侵蚀而损失的抗折强度。To mitigate the degradation,silane coupling agent(SCA)was incorporated in concretes.The effects of SCA additions on the carbonation depths and compressive strengths were evaluated.X-ray diffractometer,nitrogen adsorption porosity analyzer and scanning electron microscope were used to characterize the microstructure of carbonated binder.The results show that 0.1%SCA addition effectively slows down the carbonation degradation process in the concretes.The 28-day carbonation depth in the concrete is decreased from 13.6 to 6.4 mm.The SCA groups coupled on the surface of the hydration products restrict the diffusion and transportation of CO_(3)^(2-)ions in the capillary pore structure.The SCA groups distributed in the aggregate-binder interface generate a cross-linked structure,which improves the bonding performances,maintains the shearing resistance,and markedly enhances the flexural strengths of the concretes.This is helpful in mitigating the flexural strength loss in the concrete caused by carbonation degradation.

关 键 词：碱矿渣 混凝土 碳化侵蚀 硅烷偶联剂 

分 类 号：TU528[建筑科学—建筑技术科学]