针对含泥量和含石粉量很高以及某些机制砂品质很差导致的混凝土坍落度损失快的问题,本文提出了一种混凝土专用聚羧酸保坍剂。试验表明:该保坍剂PC-103具有很强的坍落度保持能力,并且在2h左右分散效果达到最大约280mm;并且与普通聚羧酸减水剂复配后效果明显优于单掺,其混凝土性能较好,对吸附能力高的机制砂具有良好的适应性及保坍能力。 Aiming at the problem of slump loss of concrete caused by the high content of silt and stone powder and the poor quality of some sand, a polycarboxylate preservative for concrete is proposed in this paper. The results show that the preservative PC-103 has a strong slump retention ability, and the dispersion effect is up to about 280mm at about 2h. Compared with the conventional polycarboxylate superplasticizer, the effect is better than single doping, The concrete has good performance and good adaptability to the sand with high adsorption capacity and slump retention capacity.