泥粉对聚羧酸减水剂水泥净浆流变性的影响

为探究泥粉和聚羧酸减水剂对水泥净浆流变性的影响,在掺入聚羧酸减水剂母液和两种复配助剂的基础上,分别外掺1%,2%,3%的高岭土型和蒙脱土型泥粉,并采用Bingham流变模型系统地研究泥粉掺量、种类和聚羧酸减水剂助剂对水泥净浆屈服应力及塑性粘度的影响规律.通过X射线(XRD)小角度衍射、总有机碳(TOC)、Zeta电位对宏观试验结果进行验证.结果表明:增大泥粉掺量可降低聚羧酸减水剂水泥净浆的流变性;高岭土型普通黏土对降低聚羧酸减水剂水泥净浆流变性的程度小于蒙脱土型膨润土;异戊烯基聚氧乙烯醚(TPEG类)保坍型助剂F1对水泥净浆流变性的促进作用大于异丁烯基聚氧乙烯醚(HPEG类)减水型助剂F2.

Influence of Clay Powder to Rheological Behaviour of Cement Paste With Polycarboxylate Superplasticizer

In order to explore the effect of clay powder and polycarboxylate superplasticizer on rheological behaviour of cement paste, in addition of the mother liquor of polycarboxylate superplasticizer and two kinds of compound additive, the clay powder with proportion of 1%, 2%, 3% is also added. Using Bingham rheological model, the effect of quantity of clay powder and compound additive of polycarbox ylate superplasticizer on yield stress and plastic viscosity of two rheological parameters of cement paste is systematically discussed, and verified by the macro experimental results by X ray(XRD)analysis of small angle diffraction, total organic carbon(TOC)and Zeta potential testing.The results show that the increasing admixing quantity of clay powder decreases the rheological behavior of cement paste with polycarboxylate superplasticizer.The rheological b-aviour decrease of cement paste with polycarboxylate superplasticizer due to kaolin clay is more than the behaviour decrease due to montmorillonite clay powder, and the rheological behavior increase of cement paste with polycarboxylate superplasticizer due to isoprene polyoxyethylene ether(TPEG)compound additive of F1 with slump loss resistance is more than the behavior increase due to isobutylene polyoxyethylene ether(HPEG)compound additive of F2 with water reducing ratio.