改性醇胺对水泥性能的影响及作用机制  

Effect of Modified Alcohol Amine on Properties of Cement and Its Mechanism

作　　者：刘春舵 刘凯 宁朝阳 穆松 杨京 蔡景顺 LIU Chunduo;LIU Kai;NING Chaoyang;MU Song;YANG Jing;CAI Jingshun(China Overseas Construction Limited,Shenzhen 518000,China;Guizhou Leirong Expressway Investment Management Co.,Ltd.,Qiandongnan Miao and Dong Autonomous Prefecture 556000,China;State Key Laboratory of High Performance Civil Engineering Material,Jiangsu Sobute New Materials Co.,Ltd.,Nanjing 211103,China)

机构地区：[1]中海建筑有限公司,深圳518000 [2]贵州雷榕高速公路投资管理有限公司,黔东南苗族侗族自治州556000 [3]江苏苏博特新材料股份有限公司,高性能土木工程材料国家重点实验室,南京211103

出　　处：《硅酸盐通报》2024年第10期3541-3551,共11页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金面上项目(52078240);中海建筑有限公司科研项目(GZ-KL-005/DSC/X069)。

摘　　要：针对市售增强剂中改性醇胺组分作用机理不清晰的问题,本文探究了改性醇胺(CS_(M)、CS_(N)和CS_(O))对净浆凝结时间和强度的影响,并通过水化热、水泥石定量XRD、微观结构SEM测试,探究了改性醇胺对水泥水化过程、水化产物及浆体微观结构的影响,并与三异丙醇胺(TIPA)进行对比。结果表明:TIPA与改性醇胺均表现出缓凝的性质,其中CS_(O)缓凝性最强;在强度方面,TIPA改善了测试龄期内的净浆强度发展,CS_(M)改善了净浆7~28 d强度发展,改善效果优于TIPA,CS_(N)和CS_(O)对强度存在负面效果。在机理方面,CS_(M)的掺入提高了水泥矿物相水化程度,优化了水化速率,改善了水化产物微观结构,促使水化硅酸钙(C-S-H)、Ca(OH)_(2)和钙矾石相互交错,提升了浆体致密性;TIPA促进了铁铝酸四钙(C_(4)AF)的水化;CS_(N)和CS_(O)促进了硅酸三钙(C_(3)S)和C_(4)AF的水化,但矿物相快水化反应与致密微观结构未能实现协同。改性措施方面,使用TIPA进行分子量改性相比于氨基与羟基改性更有助于改善水泥水化进程、产物分布结构及促进水泥净浆强度发展。In view of the unclear action mechanism of modified alcohol amine in commercial reinforcers,the effects of modified alcohol amine(CS_(M),CS_(N)and CS_(O))on setting time and strength of paste were investigated,and the effects of modified alcohol amine on cement hydration process,hydration products and microstructure of paste were investigated by means of hydration heat,cement quantitative XRD and microstructure SEM test,and compared with triisopropanolamine(TIPA).The results show that TIPA,modified alcohol amine all show retarding properties,and CS_(O)has the strongest retarding property.In terms of strength,TIPA improves the strength development of cement paste during the test age,and CS_(M)improves the strength development of cement paste for 7~28 d,and the improvement effect is better than that of TIPA,CS_(N)and CS_(O)have negative effects on strength.In terms of mechanism,the addition of CS_(M)increases the hydration degree of cement mineral phase,optimizes the hydration rate,improves the microstructure of hydration products,promotes the interlacing of C-S-H,Ca(OH)_(2) and ettringite,and improves the compactness of paste.TIPA promotes the hydration of C_(4)AF.CS_(N)and CS_(O)promote the hydration of C_(3)S and C_(4)AF,but the rapid hydration of mineral phase and compact microstructure can not achieve coordination.In terms of modification measures,compared with amino and hydroxyl modification,TIPA molecular weight modification is more helpful to improve cement hydration process,product distribution structure and promote the development of cement paste strength.

关 键 词：改性醇胺 凝结时间 强度 水化程度 微观结构 

分 类 号：TU528[建筑科学—建筑技术科学]