Adsorption of Superplasticizer and its Effect on Viscosity of Cement-Silica Fume Paste

被引：0
|
作者：
Zhang Q. [1 ]
Shu X. [1 ]
Yang Y. [1 ]
Ran Q. [1 ,2 ]
机构：
[1] State Key Laboratory of High-Performance Civil Engineering Materials, Jiangsu Sobute New Materials Co., Ltd., Nanjing
[2] School of Materials Science and Engineering, Southeast University, Nanjing
来源：
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | 2020年 / 48卷 / 11期
关键词：
Packing density; Preferential adsorption; Silica fume; Superplasticizer; Ultra-high performance concrete; Viscosity of the interstitial solution;
D O I：
10.14062/j.issn.0454-5648.20200237
中图分类号：
学科分类号：
摘要：
To improve the workability of ultra-high performance concrete (UHPC), the effect of superplasticizers (i.e., carboxylic-superplasticizer and phosphonic-superplasticsizer) on the rheological properties of cement/silica fume pastes with a low water-binder ratio was investigated, and the adsorption behavior of the superplasticizers in paste, the packing density and the viscosity of interstitial solution were analyzed. The results show that the superplasticizers have a preferential adsorption behavior on different particle surfaces, and carboxylic-superplasticizer has a superior adsorption ability on cement particle surfaces, and phosphonic-superplasticsizer has a stronger adsorption ability on silica fume particle surfaces. It is indicated that for a cement paste with the similar flow spread, a lower viscosity of the interstitial solutions is the main reason for a lower viscosity of paste with carboxylic-superplasticizer rather than that with phosphonic-superplasticsizer. However, the well- dispersion of silica fume particles with phosphonic-superplasticizer can result in an increased packing density, thus leading to a lower viscosity of cement-silica paste, compared to that of paste with carboxylic-superplasticizer. © 2020, Editorial Department of Journal of the Chinese Ceramic Society. All right reserved.
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页码：1716 / 1721
页数：5
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