A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Polymer film formation in cement mortars modified with water-soluble polymers
The modification of cement mortars with small amounts of water-soluble polymers (polyvinyl alcohol-acetate, 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. The grant offered by the Institute for the Promotion of Innovation by Science and Technology in Flanders (IWT-Vlaanderen) is gratefully acknowledged. The Department of Metallurgy and Materials Engineering (MTM) and the Applied Geology & Mineralogy Research Group of K.U.Leuven are acknowledged for the use of the SEM and thermal analysis systems. polymer modification; film formation; microstructure; water-soluble polymers; SEM investigation; flexural strength
Polymer film formation in cement mortars modified with water-soluble polymers
The modification of cement mortars with small amounts of water-soluble polymers (polyvinyl alcohol-acetate, 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. The grant offered by the Institute for the Promotion of Innovation by Science and Technology in Flanders (IWT-Vlaanderen) is gratefully acknowledged. The Department of Metallurgy and Materials Engineering (MTM) and the Applied Geology & Mineralogy Research Group of K.U.Leuven are acknowledged for the use of the SEM and thermal analysis systems. polymer modification; film formation; microstructure; water-soluble polymers; SEM investigation; flexural strength
Polymer film formation in cement mortars modified with water-soluble polymers
KNAPEN, Elke (author) / VAN GEMERT, Dionys
2015
Article (Journal)
English
Polymer film formation in cement mortars modified with water-soluble polymers
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