高吸水树脂对高水灰比水泥砂浆性能的影响

Effect of super absorbent polymer on the properties of cement mortar with high water- cement ratio

高吸水树脂被认为高性能混凝土的一种有效的内养护剂,但是在高水灰比的砂浆体系SAP的作用效果如何研究较少。因而,对两种高吸水树脂对水泥砂浆流动度、强度、失水率、收缩率的影响进行了研究,发现随着SAP掺量增加,砂浆的流动度、强度降低,但是干燥失水率和收缩增加。不过,适当的SAP掺量可以提高砂浆强度,降低干燥收缩。

Super absorbent polymer（ SAP）is considered as an effective curing agent of high performance concrete,but the researches on the effect of SAP in mortar with high water-cement ratio is less. The effects of SAP on the fluidity,strength,water loss rate,shrinkage rate of cement mortar were analyzed. The results show that increasing the amount of SAP decreases the fluidity and strength,but raise the dry water loss rate and shrinkage. The proper dosage,however,can improve the strength and reduce dry shrinkage.