Modification of water retention and rheological properties of fresh state cement-based mortars by guar gum derivatives

被引：34
|
作者：
Govin, Alexandre [1 ]
Bartholin, Marie-Claude [1 ]
Biasotti, Barbara [2 ]
Giudici, Max [2 ]
Langella, Valentina [2 ]
Grosseau, Philippe [1 ]
机构：
[1] Ecole Natl Super Mines, SPIN, CNRS, EMSE,UMR5307,LGF, F-42023 St Etienne, France
[2] Lamberti SpA, I-21041 Albizzate, Italy
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2016年 / 122卷
关键词：
Admixture; Rheology; Water retention; Polysaccharide; Mortar; Guar derivatives; VISCOSITY MODIFYING AGENTS; CELLULOSE ETHERS; ADMIXTURES; BEHAVIOR; HYDROXYPROPYLGUARS; MICROSTRUCTURE; ADSORPTION; MECHANISM; POLYMERS;
D O I：
10.1016/j.conbuildmat.2016.06.125
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
The present study examines the influence of chemical composition and structure of guar gum derivatives on water retention capacity (WR) and rheological behavior of fresh state cement-based mortars. The investigation was also completed by adsorption isotherms. For this, original guar gum, three HydroxyPropyl Guars (HPG) and two hydrophobically modified HPGs were selected. The effect of the molar substitution (MSHP) and of hydrophobic substitution (DSAC) was investigated. The results highlight that chemical composition of HPGs has a remarkable effect on fresh state properties of mortars. The original guar gum does not impact on neither WR nor rheological behavior. Increasing MSHP leads to an improvement of the WR and the stability of mortars while the hydrophobic units further enhance WR and lead to a decrease in the yield stress and an increase in the resistance to the flow of admixed mortars. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：772 / 780
页数：9
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