水泥和黏土矿物对不同减水剂的吸附特性  

Adsorption Characteristics of Different Superplasticizers on Cement and Clay Minerals

作　　者：马保国[1] 杨虎[1] 谭洪波[1] 代柱端[1] 

机构地区：[1]武汉理工大学,硅酸盐建筑材料国家重点实验室,武汉430070

出　　处：《硅酸盐学报》2013年第3期328-333,共6页Journal of The Chinese Ceramic Society

基　　金：国家“973”计划资助项目(2009CB23201)

摘　　要：采用有机碳测定仪和紫外分光光度计,分别研究了聚羧酸减水剂、萘系减水剂和木质素磺酸钠在水泥、高岭土和蒙脱石颗粒表面的吸附特性,并对掺高岭土和蒙脱石的水泥净浆的流动度和黏度进行了测试,用三维视频显微镜观察了三种颗粒的形貌特征。结果表明:水泥、高岭土和蒙脱石对不同减水剂的吸附量不同;水泥比高岭土和蒙脱石对萘系减水剂的吸附量大,高岭土和蒙脱石比水泥对聚羧酸和木质素磺酸钠减水剂的吸附量大;水泥和高岭土颗粒表面较平滑,蒙脱石表面较粗糙;在掺入不同减水剂的水泥浆体中,蒙脱石和高岭土的掺入都会降低浆体流动度,提高浆体黏度,并且蒙脱石的影响更大。The adsorption characteristics of polycarboxylate superplasticizer （PC）, naphthalene superplasticizer （NS） and lignin sul- fonate （LS） on cement, kaolinite and montmorillonite particles were investgated via the organic carbon （TOC） analysis and ultraviolet spectrophotometry. The fluidity and viscosity of cement paste mixed with kaolinite and montmorillonite were examined, and the morphology of the particles was observed by a three-dimensional microscopy. The results show that the amount of adsorption varies for different superplasticizers. The adsorption amount of NS on cement is greater than that of montmoriUonite and kaolinite, and the adsorption amount of PC on montmorillonite and kaolinite is greater than that of cement. The surface of cement and kaolinite particles is relatively smooth, and the surface of montmorillonite particle is rougher. With different superplasticizers, the fluidity of paste reduces and viscosity of paste increases due to the addition of kaolinite and montmorillonite, and the effect of montmorillonite is greater.

关 键 词：减水剂 吸附 流动度 黏度 高岭土 蒙脱石 

分 类 号：TU528.042.2[建筑科学—建筑技术科学]