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Interaction between two anti-graffiti treatments and cement mortar (paste) / P. M. Carmona-Quiroga in Cement and concrete research, Vol. 40 N° 5 (Mai 2010) 

Public ISBD [article]  in Cement and concrete research > Vol. 40 N° 5 (Mai 2010) . - pp. 723–730 Titre : Interaction between two anti-graffiti treatments and cement mortar (paste) Type de document : texte imprimé Auteurs : P. M. Carmona-Quiroga, Auteur Année de publication : 2012 Article en page(s) : pp. 723–730 Note générale : Bibliogr. Langues : Anglais (eng) Mots-clés : Cement  paste  ;  Mortar  ;  Thermal  analysis  ;  29Si  MAS  NMR;Anti-graffiti  coatings Résumé : Much of the twentieth century's built heritage is made of concrete, which is particularly susceptible to graffiti “attacks”. Since the traditional methods used to remove spray paint are not particularly effective on this type of material, the adoption of preventive measures by applying a new type of protective treatments, known as anti-graffiti coatings, may be a good way to tackle the problem. The present study aimed to evaluate the physical properties of a cement mortar coated with two such products and to study the possible molecular interactions between the coatings and the cement paste. Neither product induced chromatic changes on the surface of the material, while both made it water repellent. 29Si MAS NMR analysis detected a lower Q1/Q2 ratio, indicative of a longer chain length, in the C–S–H gel in the cement paste mixed with the anti-graffiti products. En ligne : http://www.sciencedirect.com/science/article/pii/S0008884610000049 [article] Interaction between two anti-graffiti treatments and cement mortar (paste) [texte imprimé] / P. M. Carmona-Quiroga, Auteur . - 2012 . - pp. 723–730. Bibliogr. Langues : Anglais (eng) in Cement and concrete research > Vol. 40 N° 5 (Mai 2010) . - pp. 723–730 Mots-clés : Cement  paste  ;  Mortar  ;  Thermal  analysis  ;  29Si  MAS  NMR;Anti-graffiti  coatings Résumé : Much of the twentieth century's built heritage is made of concrete, which is particularly susceptible to graffiti “attacks”. Since the traditional methods used to remove spray paint are not particularly effective on this type of material, the adoption of preventive measures by applying a new type of protective treatments, known as anti-graffiti coatings, may be a good way to tackle the problem. The present study aimed to evaluate the physical properties of a cement mortar coated with two such products and to study the possible molecular interactions between the coatings and the cement paste. Neither product induced chromatic changes on the surface of the material, while both made it water repellent. 29Si MAS NMR analysis detected a lower Q1/Q2 ratio, indicative of a longer chain length, in the C–S–H gel in the cement paste mixed with the anti-graffiti products. En ligne : http://www.sciencedirect.com/science/article/pii/S0008884610000049