Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 47, Issue -, Pages 1046-1052Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2013.06.007
Keywords
Polysaccharide; Hydroxypropylguars; Water retention; Molecular weight; Ultrasonic degradation
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The aim of this paper is to provide a methodology to study the influence of the molecular weight of polysaccharidic admixtures on mortar properties. A wide range of admixtures with different molecular weight and constant structure was prepared. This has been made possible by the use of ultrasonic treatment, a simple, effective, and without additive method. It appears that cellulose and guar gum derivatives, used as water retention agents, exhibit a significant molecular weight reduction according to the ultrasonic treatment duration. The water retention capacity of the mortars mixed with ultrasonically degraded admixture solutions increases with molecular weight for a same admixture. However, comparing water retention values obtained with similar molecular weight of a same family shows that effectiveness of polysaccharides as water retention agent is not linearly linked to their molecular weight. (C) 2013 Elsevier Ltd. All rights reserved.
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