Effect of delaying addition of some concrete admixtures on the rheological properties of cement pastes

被引：50
|
作者：
Aiad, I
Abd El-Aleem, S
El-Didamony, H
机构：
[1] Egyptian Petr Res Inst, Cairo, Egypt
[2] Cairo Univ, Fac Sci, Al Fayyum, Egypt
[3] Univ Zagreb, Fac Sci, Zagreb 41000, Croatia
来源：
CEMENT AND CONCRETE RESEARCH | 2002年 / 32卷 / 11期
关键词：
rheology; concrete admixtures; delaying addition; shear stress; shear rate; apparent viscosity;
D O I：
10.1016/S0008-8846(02)00886-4
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
The effect of delayed addition of two concrete admixtures, namely melamine formaldehyde sulfonate (MFS) and naphthalene formaldehyde sulfonate (NFS), on the rheological and adsorption propel-ties of ordinary Portland cement (OPC), sulfate-resisting cement (SRC) and silica fume-ordinary Portland cement (SF-OPC) pastes vas investigated. The admixture addition vas delayed by 1, 3, 6, 10 and 13 min after the addition of mixing water. The shear stress, as well as the apparent viscosity of these cement pastes, was determined at different shear rates. Total organic carbon (TOC), Ca-2 concentration and conductivity of the filtrate and the combined water content of the precipitated cement pastes were determined. The results show that delaying the admixtures addition increases the cement pastes workability than that of simultaneous addition. (C) 2002 Published by Elsevier Science Ltd.
引用
收藏
页码：1839 / 1843
页数：5
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