期刊
CEMENT & CONCRETE COMPOSITES
卷 58, 期 -, 页码 23-28出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2014.11.015
关键词
Polymer modification; Film formation; Microstructure; Water-soluble polymers; SEM investigation; Flexural strength
资金
- Institute for the Promotion of Innovation by Science and Technology in Flanders (IWT-Vlaanderen)
The modification of cement mortars with small amounts of water-soluble polymers (polyvinyl alcoholacetate, methylcellulose and hydroxyethylcellulose) is studied. During hardening, two processes can take place, i.e. cement hydration and polymer film or bridge formation. Due to the very low polymer contents, the formation of polymer films is generally not considered. In this paper, evidence is given of the presence of polymer films or bridges in mortars modified with 1% of polyvinyl alcohol-acetate or methylcellulose. A contribution to the flexural strength of these mortars is found. By means of SEM investigation, polymer bridges are detected between the layered Ca(OH)(2) crystals. Additional bonds are created which strengthen the preferential cleavage sites. Furthermore, polymer films or bridges are intergrown within the cement matrix on a submicron scale. (C) 2015 Elsevier Ltd. All rights reserved.
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