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29Si and 1H NMR study of waterproofing polymerization

AutorFortes Revilla, Carlos; Blanco Varela, M. T.; Martínez-Ramírez, S.
Fecha de publicación21-sep-2016
CitaciónYOCOCU (2016)
ResumenLime mortar, a construction material used by the ancients and still in use today, is characterized by its vulnerability to physical, chemical and biological attack, in which water plays an instrumental role. Surface coatings may be used to enhance its durability. As such coatings are applied to the outermost surface; they are the materials most liable to deteriorate. Due to the tiny amounts involved, however, it is difficult to judge when they are in need of restauration and/or replacement. Spectroscopic techniques are generally non- and at most semi-destructive, as they require only small amounts of sample; moreover, they are very useful for studying surface coatings. 29Si and 1H NMR were used in the present study to characterize different waterproof coatings before and after their application into lime mortars. Polymerization reactions were studied over an evaporating dish, without interaction with the substrate. Interaction and polymerization of the coating over the lime mortar was also studied by the same spectroscopic technique. Two waterproofing materials were used (¿Hydrophase superficii¿ and ¿RC-80¿). The first one was found to be a mixture of tert-butyl-trimethoxysilane partially polymerized (31%) and ethyl silicate. The second product proved to be a mixture of poly-methyl-siloxane and ethyl silicate. Initially 86% of the ethyl silicate and 100% of the poly-methyl-siloxane were in monomeric form. The two initial compounds in Hydrophase superficii polymerized on evaporating dish to different degrees, with 43% of the tert-butyl-trimethoxysilane and 33% of the ethyl silicate reaching maximum polymerization at the end of the test. They polymerized more fully when that product was applied on lime mortar surface, with 60% of the tert-butyl-trimethoxysilane and 40% of the ethyl silicate reaching maximum polymerization. Poly-methyl-siloxane failed to polymerize on evaporating dish, whereas 86% of the ethyl silicate formed polymers. When the product was applied to lime mortar, 80% of the ethyl silicate polymerized to the highest possible degree and poly-methyl-siloxane began to polymerize (20% to the maximum degree).
Descripción6 pags. ; 5th International Conference: Youth in Conservation of Cultural Heritage ; Madrid, 21st-23rd September 2016
URIhttp://hdl.handle.net/10261/153897
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(CFMAC-IEM) Comunicaciones congresos
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