黏土矿物对聚羧酸减水剂在净浆、砂浆和混凝土中分散性的影响

摘要/Abstract

摘要： 为解决黏土矿物给实际施工带来的负面影响,以丙烯酸(AA)、异戊醇聚氧乙烯醚(TPEG)和水解聚马来酸酐(HPMA)为原料合成抗泥型聚羧酸减水剂(PCE),并对其进行结构表征。在添加不同用量和不同黏土矿物的条件下,测试了PCE在净浆、砂浆和混凝土中的分散性;用总有机碳(TOC)测定仪测试了不同黏土矿物对PCE的吸附能力;通过XRD测试了三种黏土矿物与PCE相互作用后的层间距。结果表明:黏土矿物对PCE的负作用和吸附量顺序是蒙脱土>高岭土>伊利土;PCE通过表面吸附与伊利土和高岭土相互作用,通过层间吸附与蒙脱土相互作用。

关键词: 聚羧酸减水剂, 水泥, 蒙脱土, 伊利土, 高岭土, 吸附量

Abstract: In order to solve negative impacts of clay minerals on actual construction, the anti-clay polycarboxylate superplasticizer(PCE) was synthesized using acrylic acid(AA), isoamyl alcohol polyoxyethylene ether(TPEG), and hydrolyzed polymaleic anhydride(HPMA) as raw materials,and its structure was characterized. The dispersibility of PCE in paste, mortar, and concrete was tested under the conditions of adding different amounts and different types of clay minerals. The adsorption capacity of different clay minerals to PCE was measured by total organic carbon (TOC) analyzer.The interlayer spacing of three clay minerals interacting with PCE was tested by XRD. The results show that the order of negative effect and adsorption amount of clay minerals for PCE is montmorillonite > kaolin > illite. PCE interacts with illite and kaolin through surface adsorption, while it interacts with montmorillonite through interlayer adsorption amount.

Key words: polycarboxylate superplasticizer, cement, montmorillonite, illite, kaolinite, adsorption amount

中图分类号:

TU528

熊军红, 欧阳东. 黏土矿物对聚羧酸减水剂在净浆、砂浆和混凝土中分散性的影响[J]. 硅酸盐通报, 2023, 42(7): 2344-2353.

XIONG Junhong, OUYANG Dong. Influences of Clay Minerals on Dispersibility of Polycarboxylate Superplasticizer in Paste, Mortar and Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(7): 2344-2353.

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