聚羧酸减水剂对微膨胀水泥基灌浆材料工作性能的影响研究

针对控制聚羧酸盐系高性能减水剂的种类和掺量，通过灌浆材料的扩展度、容重、膨胀率、早期强度及保水性进行对比试验，研究了不同型号、掺量的聚羧酸盐系减水剂对灌浆材料工作性能的影响，并验证了其力学性能和膨胀率是否符合要求。结果显示:在掺量为3.7‰~4.0‰时，各型减水剂能明显改善微膨胀水泥基灌浆材料的流动性、保水性，提高其早期强度，同时此种灌浆材料能产生微膨胀。

Research on Effect of Polycarboxylate Superplasticizer on Service Behaviour of Microdilatancy Cement-based Grouting Material

By regulating the type and content of high-performance polycarboxylate superplasticizer, the contrast tests on grouting material's extended degree, bulk density, expansion ratio, early strength and water retention were carried out to study how polycarboxylate superplasticizer in different type and content affect the service behaviour of grouting material, and then to verify whether its mechanical property and expansion ratio meet the requirement. The results show that, where the content is 3.7 ‰~4.0 ‰, the various types of superplasticizer may significantly improve the fluidity and water retention of microdilatancy cement-based grouting material and enhance its early strength, meanwhile, micro-expansion may happen on this kind of grouting material.