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- Title
黏土对聚羧酸减水剂应用性能的抑制机理.
- Authors
王子明; 吴昊; 徐莹; 刘晓
- Abstract
The adsorption rate, water absorption, volume swelling capacity of 4 kinds of clay, and the interlayer spacing of montmorillonite were tested. The adsorption capacity and mode of polycarboxylate superplasticizer (PCE) on different clays were studied. The volume change of solid and liquid phase in fresh concrete before and after adsorbing PCE by clay was calculated. The inhibition mechanism of clay on applying performance of PCE was explored. The results show that the adsorption of PCE on clay is higher than that on cement, and adsorption capacity of montmorillonite is the strongest of all. The side chain of PCE molecular is adsorbed into interlayers of montmorillonite, which increases the interlayer spacing (d(001)) of montmorillonite from 1. 443 nm to 1. 863 nm. Clay adsorbs more PCE and thus reduces the effective content for dispersing action. The volume of clay expands after absorbing water, increasing the solid phase volume and decreasing the liquid phase volume, and finally worsening the workability of fresh concrete.
- Publication
Jianzhu Cailiao Xuebao: Journal of Building Materials, 2014, Vol 17, Issue 2, p234
- ISSN
1007-9629
- Publication type
Article
- DOI
10.3969/j.issn.1007-9629.2014.02.009