混凝土早强修补材料基准水泥配合比优化研究  

Optimization of Standard Cement Mix Ratio for Concrete Early-Strength Repair Materials

作　　者：李祖仲[1] 毛浩天 王亮 吴志宽 文硕 刘卫东 LI Zuzhong;MAO Haotian;WANG Liang;WU Zhikuan;WEN Shuo;LIU Weidong(School of Materials Science and Engineering,Changan University,Xian 710061,China;Guangxi Key Laboratory of Road Structure and Materials,Guangxi Transportation Science and Technology Co.,Ltd.,Nanning 530007,China)

机构地区：[1]长安大学材料科学与工程学院,西安710061 [2]广西交科集团有限公司,广西道路结构与材料重点实验室,南宁530007

出　　处：《硅酸盐通报》2025年第3期802-810,共9页Bulletin of the Chinese Ceramic Society

基　　金：陕西省科技创新团队(2024RS-CXTD-56);长安大学大学生创新创业训练资助项目(S202410710362,S202410710096)。

摘　　要：针对在役水泥混凝土构造物的早期病害问题,开展早强修补材料组成研究具有重要的现实意义。本文分别采用硫铝酸盐水泥(SAC)、铁铝酸盐水泥(FAC)与普通硅酸盐水泥(OPC)与进行复配,分析OPC对复配水泥凝结时间及抗压强度的影响,以优化早强修补材料基准水泥配合比,并采用水化热、扫描电子显微镜(SEM)、X射线衍射仪(XRD)及热重分析(TG-DTG)测试研究最优配合比下水泥的水化行为及其水化产物的微观形貌、物相组成及热特性。结果表明:与SAC复配时,SAC与OPC的最优质量配合比为3∶2;与FAC复配时,FAC与OPC的最优质量配合比为4∶1。在最优配合比下,OPC的掺入均缩短了复配水泥体系放热速率峰值出现的时间,降低了总放热量。SEM、XRD及TG-DTG分析均说明了加入OPC后,在硅酸盐水化产物氢氧化钙(CH)及OPC中石膏(CS)的协同作用下,硫铝酸钙水化产物铝胶(AH_(3))与CH、CS反应,生成钙矾石(AFt),铁铝酸盐水泥中铁铝酸四钙(C_(4)AF)与CH、CS反应,生成水化铁铝酸钙固溶体(C_(3)(A,F)·3CS·H_(32)),均推进了复配水泥的水化进程。研究成果为混凝土早强修补水泥基材料试验研究提供了参考。Aimed at early disease of cement concrete structure in service,researches on the composition of early-strength repair materials have important practical significance.This paper employed sulfoaluminate cement(SAC),ferritealuminate cement(FAC),and ordinary Portland cement(OPC)to prepare the composite standard cements,respectively,and analyzed the effect of OPC on the setting time and strength of the composite cements to optimize the mix ratio of earlystrength repair materials.The hydration heat,scanning electron microscopy(SEM),X-ray diffraction(XRD)and thermogravimetric analysis(TG-DTG)tests were used to study the hydration behavior,microstructure,phase composition,and thermal characteristics of the hydration products under the optimal max ratio.The results show that the optimal mass mix ratio of SAC to OPC is 3∶2 and the optimal mass mix ratio of FAC to OPC is 4∶1.Under the optimal mix ratio,the addition of OPC shortens the time to the peak value of heat release rate curve of the composite cements and reduces the total heat release.The results of SEM,XRD and TG-DTG analyses all indicate that with the addition of OPC,affected synergistically by Ca(OH)_(2)(CH)from the silicate hydration product and the gypsum in OPC,aluminum gel(AH_(3))from sulfoaluminate cement hydrate product reacts with CH and CS to form ettringite(AFt),and the tetracalcium aluminoferate(C_(4)AF)in ferrite-aluminate cement reacts with CH and CS to form a calcium ferrite aluminate solid solution(C_(3)(A,F)3CS H_(32)),which facilitates the hydration process of the composite cements.The research results provide a reference for further experimental studies on cement-based materials for early-strength repair materials.

关 键 词：复合材料 水泥 修补材料 水化机理 微观结构 配合比 

分 类 号：U414[交通运输工程—道路与铁道工程] TU528[建筑科学—建筑技术科学]