ACS新型高效减水剂的研究(3)——对水泥颗粒产生分散-流化作用的机理  

Study on Acrylic Graft Copolymer-based High-range Water Reducing Agent for Concrete (3) ——Mechanism of Dispersion-fluidization Effect

作　　者：李志莉[1] 陈克强[1] 陈永芬[1] 刘江[1] 

机构地区：[1]高分子材料工程国家重点实验室

出　　处：《四川大学学报（工程科学版）》2001年第1期63-65,共3页Journal of Sichuan University (Engineering Science Edition)

摘　　要：研究了丙烯酸接枝共聚型高效减水剂ACS对水泥浆产生分散 -流化作用的机理。对添加ACS的体系水泥胶粒表面ζ-电位的测定表明 ,静电斥力是产生分散 -流化作用的物理因素之一。ACS支链中n值对流动度的影响证明了立体位阻效应的存在。表面张力是第三个物理因素。通过测定ACS对水泥水化的影响和ACS共聚物相对粘度在碱性条件下的变化 ,表明对水泥水化的抑制和分子徐放是产生分散The mechanism of dispersion fluidization effect of ACS on cement particles was discussed. The measurements of ζ potential indicated that electrostatic repulsion is one of the physical factors. The other affecting factor is stereo hindrance,which was found from the influences of n on fluidity of cement grout. Surface tension is another one.chemical affecting factors include the retarding effect of ACS on cement hydration as well as the slow releasing of —COO - of copolymer molecules with time under alkaline condition .

关 键 词：丙烯酸接枝共聚型 高效减水剂 分散-流化作用 水泥浆 

分 类 号：TU528.042[建筑科学—建筑技术科学]