减水剂对硫铝酸盐水泥早期水化影响

Effect of Water Reducing Agent on Early Hydration of Sulphoaluminate Cement

研究了聚羧酸系高效减水剂(PCE)和萘系减水剂(FDN)对硫铝酸盐水泥净浆工作性能及力学性能影响,通过XRD和SEM检测手段对水化产物进行表征。结果表明:两种减水剂对硫铝酸盐水泥净浆流动度的影响存在饱和点;相比于FDN型减水剂,PCE型减水剂对硫铝酸盐水泥净浆具有更好的减水效率及分散能力。PCE型减水剂阻碍硫铝酸盐水泥净浆早期水化,并降低硫铝酸盐水泥净浆1 d抗压强度;FDN型减水剂能够加速硫铝酸盐水泥净浆早期水化,缩短初凝和终凝时间,提高硫铝酸盐水泥净浆1 d抗压强度。两种减水剂对硫铝酸盐水泥净浆3 d后抗压强度及水化产物种类均没有影响。

The work performance and mechanical properties of sulphoaluminate cement by adding polycarboxylate superplasticizer（ PCE） and naphthalene superplasticizer（ FDN） were investigated. The hydrated products of the paste has been analyses with XRD and SEM technologies. The results show that there are saturation points on the effect of the two water reducing agents on the fluidity of the sulphoaluminate cement paste. When compared with FDN superplasticizer,PCE superplasticizer has better water reducing efficiency and dispersibility to sulphoaluminate cement. PCE superplasticizer can hinder the early hydration of sulphoaluminate cement,and reduce the 1 d compressive strength. FDN superplasticizer accelerates the early hydration of sulphoaluminate cement,which shortens the initial setting and final setting time,and improves sulphoaluminate cement 1 d compressive strength. The two kinds of water reducing agents have no effect on the compressive strength and hydration products of sulphoaluminate cement after 3 d.