A microstructural approach to adherence mechanism of poly (vinyl alcohol) modified cement systems to ceramic tiles
A microstructural approach to adherence mechanism of poly (vinyl alcohol) modified cement systems to ceramic tiles
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DOI：
10.1016/j.cemconres.2006.11.011
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发表时间：
2007-02-01
影响因子：
11.4
通讯作者：
Mansur, H. S.
中科院分区：
文献类型：
--
作者：
Mansur, A. A. P.;Santos, D. B.;Mansur, H. S.
PVA是一种水溶性聚合物，用作水泥改性剂。通过加入PVA观察到的一个重要的改性是水泥浆体和骨料之间的粘结强度的增加。本工作的目的是研究PVA对水泥浆体与瓷砖粘结机理的影响。将含有和不含PVA的浆料施加在瓷砖的背面上，并且在56天后通过SEM评估界面的微观结构。断裂的模式从主要的界面失效改变为混合模式的界面内聚失效的糊剂与聚合物添加在其中观察到的多孔过渡区的厚度的减少和糊剂散装。此外，在普通糊剂中，观察到与表面接触的双层膜（CH加C-S-H）的形成，而在改性糊剂中，鉴定出单层C-S-H。(C)2006爱思唯尔有限公司版权所有。
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.