外加剂添加时间对水泥浆体吸附和分散性能的影响  

Influence of Adding Time of Superplasticizers on Adsorption Behavior and Dispersive Performance of Cement Pastes

作　　者：马保国[1] 夏永芳[1] 谭洪波[1] 汪杰[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6期761-765,共5页Journal of The Chinese Ceramic Society

基　　金：国家重点基础研究发展计划(2009CB623201);国家自然科学基金(5118363)资助项目

摘　　要：通过分析外加剂添加时间对水泥浆体吸附、Zeta电位、流动度的影响及其相互关系,研究了萘系高效减水剂和聚羧酸系高效减水剂对普通硅酸盐水泥浆体吸附及分散性能的影响。结果表明:随减水剂添加时间的延迟,水泥颗粒对萘系减水剂和聚羧酸减水剂的吸附量均急剧降低至趋于平缓;减水剂添加时间对水泥浆体吸附、电位与流动度之间关系的影响不同,随着添加时间的延长,减水剂吸附量降低、电位绝对值减小;萘系高效减水剂最佳掺加时间为加水后10 min左右,此时水泥颗粒对减水剂分子的吸附量偏低,对应的水泥浆体达到最佳的流动度;聚羧酸系高效减水剂与水同掺时吸附量最大,对应水泥浆体的流动度也最大。The adsorption behavior, zeta potential and fluidity of the cement paste as well as their mutual relations were investigated to clarify the effect of superplasticizers （i.e., naphthalene formalde sulfonate （NFS） and polycarboxylic copolymer （PCC）） on the ad- sorption and dispersion of the cement paste. The results show that the adsorption amount of NFS and PCC on cement particles de- creases with the deteration of adding superplasticizer. The adsorption, zeta potential and fluidity of the cement paste varied with the time of adding superplastizer. The adsorption amount and the zeta potential both reduced with the deteration of adding time. The best adding time of NFS was 10 min after mixing water. The adsorption degree of NFS on cement particles was quite small and the fluidity of cement paste reached superior when PCC and water were added simutaneously.

关 键 词：减水剂 水泥浆体 添加时间 吸附 分散性能 

分 类 号：TU528.042[建筑科学—建筑技术科学]