کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1457245 | 989248 | 2009 | 10 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Physico-chemical characterization of EVA-modified mortar and porcelain tiles interfaces Physico-chemical characterization of EVA-modified mortar and porcelain tiles interfaces](/preview/png/1457245.png)
EVA (poly(ethylene-co-vinyl acetate)) redispersable powders with different contents of copolymers were tested in order to evaluate their effects on the complex interactions developed at mortar/tile interface. EVA addition has increased the bond strength almost 40% when compared with unmodified mortar. Based on EVA hydrolysis, a novel method named as ‘Extension of Hydrolysis (EH)’ was suggested to monitor the reaction mechanism which occurred during the interface layer formation. Thus, higher EH values were related to a significant improvement of adhesion at interface observed as a changing on the failure mode from mostly cohesion to adhesion. Calculated EH parameter of 2.64 was associated with a cohesive component of rupture in the mortar of 50% while for an EH of 0.92, the rupture in the mortar was only 7%. The enhancement on adhesion was attributed to the hybrid ceramic–polymer interface formed based on hydrogen-bonds between silanol groups from tile surface and hydroxyl groups from hydrolyzed EVA.
Journal: Cement and Concrete Research - Volume 39, Issue 12, December 2009, Pages 1199–1208