Effect of Polyvinyl Alcohol on Rheology of Portland Cement Pastes

被引：0
|
作者：
Nguyen, D. D. [1 ]
Devlin, L. P. [2 ]
Koshy, P. [1 ]
Sorrell, C. C. [1 ]
机构：
[1] UNSW Australia, Sch Mat Sci & Engn, Sydney, NSW 2052, Australia
[2] Bostik Inc, Wauwatosa, WI 53226 USA
来源：
JOURNAL OF THE AUSTRALIAN CERAMIC SOCIETY | 2015年 / 51卷 / 02期
关键词：
rheology; cement pastes; tile adhesives; polyvinyl alcohol; SEDIMENTATION BEHAVIOR; SUSPENSIONS; ADMIXTURES; POLYMERS; MORTARS;
D O I：
暂无
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Polyvinyl alcohols (PVAs) are used commonly in cementious tile adhesives (CTAs). The present work reports fundamental data for the impact of PVA on the rheology of Portland cement pastes as a function of the content and molecular weight (M-w) of PVA. The rheology (shear rate vs. shear stress and viscosity vs. shear rate) of cement pastes was measured using a rheometer with coaxial cylinder geometry. The addition of PVA was observed to increase the yield stress, the slope of the shear stress vs. shear rate curve, and the viscosity of cement paste; these effects are enhanced with increasing content and Mw of PVA. PVA-modified cement paste shows (a) shear thinning with increasing shear rate, (b) thixotropy with decreasing shear rate, and (c) permanent hysteresis. These data have practical implications for resistance to the potential slumping and sagging associated with tiles and adhesives.
引用
收藏
页码：23 / 28
页数：6
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