摘   要：在聚羧酸系高效减水剂中复配消泡剂，探讨了消泡剂掺量对砂浆性能的影响。结果表明：当基准砂浆加入消泡剂时，基准砂浆的含气量大幅度降低；砂浆处于高流动度状态时，增加消泡剂掺量，砂浆的流动度逐渐增大、含气量逐渐降低且最终趋于稳定、黏度逐渐降低、屈服应力呈现先减后增的趋势，当消泡剂掺量为0.5g时，屈服应力达到最小；固定配比时，增加水胶比，砂浆含气量呈现升高的趋势。

Abstract: Effects of defoamer dosage on properties of mortars were investigated by adding defoamers into the polycarboxylate superplasticizer. The experimental results show that: when adding defoamer in the reference mortar, the air content of the mortar could decrease sharply; when the mortar is in a high state of fluidity, with the increase of defoamer dosage, the fluidity of mortar increases gradually, the air content of mortar reduces gradually and eventually tends to stabilize, the viscosity of mortars could reduce gradually, and the yield stress of mortar presents a trend of decreasing at first and then raising, when the defoamer dosage is 0.5g, the yield stress of mortar reaches a minimum value; when the W/B increases, the air content of mortar tends to increase at a fixed mix proportion.