水泥浆体体系ζ-电位探究

Study on ζ-potential of Cement Paste System

本文通过电泳法系统测定了水泥浆体体系的ζ-电位,研究了实际工程应用中,对水泥浆体性质影响较大、实际可控的五个因素对水泥浆体ζ-电位的影响规律。研究证明:水化时间,掺合料对水泥浆体的ζ-电位影响不大;低水灰比时,水泥浆体中电解质离子浓度较高;聚羧酸减水剂能有效提高水泥颗粒表面ζ-电位,但聚羧酸减水剂对ζ-电位的影响不如萘系减水剂的大;适量硫酸盐可提高掺聚羧酸减水剂的水泥浆体ζ-电位,增加水泥颗粒间静电斥力,对水泥浆体的分散性和流动性有利。实验结论对研究水泥浆体的介电性质、流变性能及水泥与减水剂的分散性具有较高的理论参考价值。

The paper determined ζ-potential of cement paste system systematic using electrophoresis method,researched the effect of five controllable factors on ζ-potential of cement paste system,The results illustrates： hydration time and admixtures have little influence on ζ-potential of cement paste;low water/cement ratio,the concentration of ion electrolyte is high in cement paste;Polycarboxylate superplasticizer could enhance ζ-Potential of cement paste effectively,however,the impact of ζ-potential naphthalene superplasticizer is stronger than that of Polycarboxylate superplasticizer;certain amount of sulfate could improve the ζ-potential on the cement particles with addition of Polycarboxylate superplasticizer.So the increase of the electrostatic repulsion contributes to the dispersion ability and fluidity.It had high reference value in dielectric properties and rheological properties of cement paste,and cement dispersion ability with superplasticizer in theory.