Influence of hydroxypropylguars on rheological behavior of cement-based mortars

被引：24
|
作者：
Poinot, Thomas [1 ]
Govin, Alexandre [1 ]
Grosseau, Philippe [1 ]
机构：
[1] Ecole Natl Super Mines, SPIN EMSE, CNRS, LGF,UMR5307, F-42023 St Etienne, France
来源：
CEMENT AND CONCRETE RESEARCH | 2014年 / 58卷
关键词：
Polysaccharide; Hydroxypropylguar; Admixture; Mortar; Rheology; VISCOSITY MODIFYING ADMIXTURES; WATER-RETAINING AGENTS; PHYSICOCHEMICAL PARAMETERS; GUAR GUM; THIXOTROPIC PROPERTIES; ADSORBING POLYMERS; RETENTION AGENT; CONCRETE; PASTES; MECHANISM;
D O I：
10.1016/j.cemconres.2014.01.020
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Hydroxypropylguars (HPGs) are used as water retention agents in modern factory-made mortars. Nevertheless, these molecules can also impact the rheological behavior of cement-based materials. The influence of HPG and its dosage on mortar theological properties was thus investigated thanks to a suitable measurement procedure. HPG allows keeping a positive yield stress value while the yield stress of hydroxypropyl methyl cellulose (HPMC) mortars was found to decrease with an increase in dosage. HPG increases the shear-thinning behavior and the consistency of mortars. The study of pore solution viscosity suggests that the entanglement of HPG coils beyond a threshold dosage is crucial to understand the rheological macroscopic behavior of HPG-admixed mortars. Nevertheless, the increase in mortar viscosity induced by HPG was lower than expected which reveals additional and specific repulsive forces induced by polysaccharides. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：161 / 168
页数：8
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