Effect of competitive adsorption between sodium tripolyphosphate and naphthalene superplasticizer on fluidity of cement paste

被引：30

作者：

Tan Hongbo ^{[1
]}

Ma Baoguo ^{[1
]}

Li Xiangguo ^{[1
]}

Jian Shouwei ^{[1
]}

Yang Hu ^{[1
]}

机构：

[1] Wuhan Univ Technol, State Key Lab Silicate Mat Architectures, Wuhan 430070, Peoples R China

来源：

JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION | 2014年 / 29卷 / 02期

基金：

中国国家自然科学基金;

关键词：

sodium tripolyphosphate; naphthalene superplasticizer; zeta-potential; complex; competitive adsorption; WORKABILITY RETENTION; POLYPHOSPHATE; PHOSPHATE; HYDRATION; SULFONATE; MORTARS; DOSAGE;

D O I：

10.1007/s11595-014-0917-4

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The adsorption amount, zeta-potential of cement particles and fluidity of cement paste were tested to research the competitive adsorption between naphthalene superplasticizer (FDN) and STPP. The experimental results showed that the presence of STPP could significantly improve the fluidity of cement paste and reduce the fluidity loss with FDN. There existed a competitive adsorption between STPP and FDN. STPP and calcium ions formed complexes; they preferentially adsorbed onto surface of cement particles and preempt adsorption points of FDN; and it reduced adsorption amount of FDN. In the absence of STPP, saturation adsorption amount of FDN was 5.93 mg/g; but when the dosage of STPP was 0.1%, it reduced to 4.3 mg/g (about 72.5%). The adsorption amount of FDN was reduced by STPP, but zeta-potential of cement particles enhanced and fluidity of cement paste increased because of strong negative charge effect of the complexes. Adsorption of the complexes would delay Ca2+ into liquid and inhibit formation of active adsorption points. Then, content of FDN in liquid increased with the addition of STPP and zeta-potential of cement particles became stable. In this way, fluidity loss of cement paste reduced.

引用

页码：334 / 340

页数：7

共 30 条

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