Cement hydration and microstructure formation in the presence of water-soluble polymers

被引：277
|
作者：
Knapen, E. [1 ,2 ]
Van Gemert, D. [1 ]
机构：
[1] Dept Civil Engn, Bldg Mat & Technol Div, B-3001 Heverlee, Belgium
[2] De Nayer Univ Coll, Mat & Struct Res Grp, B-2860 St Katelijne Waver, Belgium
来源：
CEMENT AND CONCRETE RESEARCH | 2009年 / 39卷 / 01期
关键词：
Retardation (A); Hydration products (B); Microstructure (B); SEM (B); Polymers (D); ADSORPTION; CELLULOSE; PASTES; SILICA;
D O I：
10.1016/j.cemconres.2008.10.003
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Hardening of cement mortars modified with small amounts of water-soluble polymers implies both cement hydration and polymer film formation. In this paper, the effect of the presence of water-soluble polymers on the cement hydration reactions is investigated by means of isothermal calorimetry, thermal analysis, FT-IR spectroscopy and SEM investigation. In spite of an initial retardation of the hydration reactions, a higher degree of hydration is found after 90 days for 1% PVAA, MC and HEC modified mortars, due to a better dispersion of the cement particles in the mixing water. MC also affects the morphology of the Ca(OH)(2) crystals. Polymer bridges are detected between the layered crystals, gluing the layers together and strengthening the microstructure. Additionally, the internal cohesion of all bulk polymer modified cement pastes is improved. In the Presence of the polymers, a more cohesive microstructure with a smaller amount of microcracks is created. (c) 2008 Elsevier Ltd. All rights reserved.
引用
收藏
页码：6 / 13
页数：8
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