A microstructural approach to adherence mechanism of poly (vinyl alcohol) modified cement systems to ceramic tiles

被引：101
作者：
Mansur, A. A. P. [1 ]
Santos, D. B. [1 ]
Mansur, H. S. [1 ]
机构：
[1] Univ Fed Minas Gerais, Dept Met & Mat Engn, BR-30160030 Belo Horizonte, MG, Brazil
来源：
CEMENT AND CONCRETE RESEARCH | 2007年 / 37卷 / 02期
关键词：
microstructure; SEM; bond strength; admixture; interfacial transition zone;
D O I：
10.1016/j.cemconres.2006.11.011
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
PVA is a water soluble polymer used as cement modifier. An important modification observed by addition of PVA is the increase of the bond strength between cement paste and aggregate. The purpose of this work was to investigate the effect of PVA on the mechanism of adherence of cement pastes to ceramic tiles. Pastes with and without PVA were applied on the back side of porcelain tiles and after 56 days the microstructures of the interfaces were evaluated by SEM. The mode of rupture changed from mostly interfacial failure to a mixed-mode interfacial-cohesive failure for the paste with polymer addition in which was observed the reduction of the thickness of the porous transition zone between the and paste bulk. Also, in plain paste the formation of a duplex film (CH plus C-S-H) in contact with the surface was observed while in modified paste a single layer of C-S-H was identified. (C) 2006 Elsevier Ltd. All rights reserved.
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收藏
页码：270 / 282
页数：13
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