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Physico-chemical characterization of EVA-modified mortar and porcelain tiles interfaces
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.
Physico-chemical characterization of EVA-modified mortar and porcelain tiles interfaces
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.
Physico-chemical characterization of EVA-modified mortar and porcelain tiles interfaces
Mansur, Alexandra A.P. (Autor:in) / Nascimento, Otavio Luiz do (Autor:in) / Mansur, Herman S. (Autor:in)
Cement and Concrete Research ; 39 ; 1199-1208
2009
10 Seiten, 53 Quellen
Aufsatz (Zeitschrift)
Englisch
Additiv , Adhäsionsfestigkeit , Bindefestigkeit , Dispersion (Lösung) , Fehleranalyse , Grenzflächenreaktion , hartgebrannte Keramikfliese , Hydrolyse , keramische Hartbrandfliese , Monitoring , Polyethylen , Portlandzement , Porzellan , Reaktionsmechanismus , Vinylacetat , Wasserstoffbrücke , Zementmörtel
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