Multifunctional polycarboxylic acid concrete admixture and preparation method thereof: Fid-Bau Portal

Multifunctional polycarboxylic acid concrete admixture and preparation method thereof

JIA LEI / LIU YONGCHEN / WANG ZHONGXIN / SHI CHUN / LI HESHENG

The invention discloses a multifunctional polycarboxylic acid concrete admixture and a preparation method thereof, wherein the multifunctional polycarboxylic acid concrete admixture comprises 8-12 parts of a water reducing type polycarboxylic acid water reducing agent, 2-4 parts of a slump retaining type polycarboxylic acid water reducing agent, a high-dispersity polycarboxylic acid admixture, sodium gluconate, a polycarboxylic acid water-retaining agent, an air entraining agent and tap water. According to the invention, according to the action mechanism of adsorption and dispersion of a water reducing agent, a modern cement production process, the compatibility of a cement grinding aid and the water reducing agent, the action of a cement hydration mechanism, the influence of machine-made sand on the water reducing agent and other factors are combined to develop a multifunctional polycarboxylic acid concrete admixture which is good in applicability, good in dispersity, resistant to segregation and bleeding and capable of reducing pump loss, wherein the multifunctional admixture has good compound dispersity and synergistic interaction during application, so that certain defects of application of a common polycarboxylic acid water reducer in concrete are overcome.

本发明公开了一种多功能性聚羧酸混凝土外加剂及制备方法，包括减水型聚羧酸减水剂、保坍型聚羧酸减水剂、高分散性聚羧酸外加剂、葡萄糖酸钠、聚羧酸类保水剂、引气剂以及自来水，其中减水型聚羧酸减水剂的占比设为8份‑12份，所述保坍型聚羧酸减水剂的占比设为2份‑4份。本发明通过依据减水剂的吸附和分散的作用机制，并结合现代水泥生产工艺及水泥助磨剂与减水剂相容性、水泥水化机理的作用，机制砂对于减水剂的影响等因素，开发的一种适用性好、分散性好、抗离析泌水、减少泵损的一种多功能性聚羧酸混凝土外加剂，该多功能性外加剂在应用时具有良好的复配分散性、协同增效性，从而弥补了普通聚羧酸减水剂在混凝土中应用的某些不足。

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