本文采用X射线衍射、差热失重、扫描电镜和压汞测孔等测试手段,首次在微观层次上系统地研究了腐植酸钠减水剂的作用机理,阐述了在水泥—水体系中掺用腐植酸钠减水剂后,在水泥水化动力学、水化产物形貌及水泥石亚微观结构方面所产生的影响,指出该减水剂具有引气、缓凝、减水、增塑等综合效应。 In this paper, X-ray diffraction, differential thermal weight loss, scanning electron microscopy, and mercury injection hole testing methods were used. For the first time, the mechanism of action of sodium humate water reducer was systematically studied at the microscopic level, and the use of cement in the cement-water system was described. The effects of humic acid sodium water reducer on the hydration kinetics of cement, the morphology of hydration products and the submicroscopic structure of cement stone indicate that the water reducer has bleed air, retarder, water reduction, plasticization, etc. Comprehensive effect.