聚合氯化铝对聚羧酸减水剂黏土吸附性的影响

摘要/Abstract

摘要： 砂石骨料中附带的黏土矿物对水泥基材料的工作性能具有严重劣化作用,制约了聚羧酸减水剂的分散功能。本文通过Zeta电位、吸光度、X射线衍射等方法研究了聚合氯化铝对聚羧酸减水剂黏土吸附性的影响规律,进而研究了其对掺加钙基膨润土砂浆和混凝土工作性能的改善效果,并探明了相互作用机理。结果表明,聚合氯化铝降低了钙基膨润土对聚羧酸分子的表面吸附量,但不能抑制插层吸附作用,在一定程度上改善了聚羧酸减水剂的黏土耐受性。6%(质量分数)的聚合氯化铝改善了掺加钙基膨润土砂浆和混凝土的工作性能,这为解决实际工程中含泥骨料的使用难题提供了一种性价比较高的新策略。

关键词: 聚合氯化铝, 聚羧酸减水剂, 膨润土, 水泥基材料, 工作性能, 吸附

Abstract: The clay minerals attached to aggregate have serious deterioration effects on the workability of cement-based materials, which restricts the dispersion function of polycarboxylate superplasticizer. In this paper, the influence of polyaluminum chloride on the adsorption of polycarboxylate superplasticizer about clay was studied by Zeta potential, absorbance, and X-ray diffraction methods. And then, the improvement effect of polyaluminum chloride on the workability of mortar and concrete with calcium-based bentonite was studied, and the interaction mechanism was explored. The results show that polyaluminium chloride reduces the surface adsorption of calcium-based bentonite to polycarboxylate molecule, but it cannot inhibit the intercalation adsorption. The 6% (mass fraction) polyaluminum chloride improves the workability of mortar and concrete mixed with calcium-based bentonite. This behavior partly improves the clay resistance of polycarboxylate superplasticizer, providing a new strategy for solving the use of aggregate with high clay in practical engineering.

Key words: polyaluminium chloride, polycarboxylate superplasticizer, bentonite, cement-based material, workability, adsorption

中图分类号:

TU528

景国建, 徐凯丽, 徐兴伟, 牛腾, 韩乐冰. 聚合氯化铝对聚羧酸减水剂黏土吸附性的影响[J]. 硅酸盐通报, 2023, 42(7): 2354-2360.

JING Guojian, XU Kaili, XU Xingwei, NIU Teng, HAN Lebing. Effect of Polyaluminum Chloride on Adsorption of Polycarboxylate Superplasticizer about Clay[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(7): 2354-2360.

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