Effect of sodium salt of naphthalene-formaldehyde polycondensate on ettringite formation

被引：37

作者：

Hekal, EE ^{[1
]}

Kishar, EA

机构：

[1] Ain Shams Univ, Fac Sci, Dept Chem, Cairo, Egypt

[2] Ain Shams Univ, Fac Girls, Dept Chem, Cairo, Egypt

来源：

CEMENT AND CONCRETE RESEARCH | 1999年 / 29卷 / 10期

关键词：

microstructure; X-ray diffraction; ettringite; high-range water reducers;

D O I：

10.1016/S0008-8846(99)00110-6

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The suspension hydration of C(3)A with gypsum (in the molar ratio of 1:3) was investigated at room temperature and water/solid ratio of 4. The hydration was carried out in presence of 0, 1, and 3% sodium salt of naphthalene-formaldehyde polycondensate and the mixes were designated as I, II, and III, respectively. The only hydration product formed in the presence and absence of the superplasticizer was ettringite. The rate of ettringite formation was retarded by the presence of the superplasticizer. This effect was more pronounced at high dosage of the superplasticizer only during the first 24 h. The presence of sodium salt of naphthalene-formaldehyde polycondensate caused a decrease in the size of the formed ettringite crystals, and as the percentage of the admixture increased, the crystal size decreased. In addition, there was an interaction between the used superplasticizer and the formed ettringite as indicated from infrared analysis. (C) 1999 Elsevier Science Ltd. All rights reserved.

引用

页码：1535 / 1540

页数：6

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[2]

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[3]

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