Assessment of phase formation in lime-based mortars with added metakaolin, Portland cement and sepiolite, for grouting of historic masonry |
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| Authors: | Alberto Sepulcre-Aguilar Francisco Hernández-Olivares |
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| Affiliation: | a Departamento de Ciencias y Técnicas Aplicadas, Escuela Superior de Conservación y Restauración de Bienes Culturales de Madrid, C/ Guillermo Rolland, 2, 28013 Madrid, Spain
b Departamento de Construcción y Tecnología Arquitectónicas, Escuela Técnica Superior de Arquitectura, Universidad Politécnica de Madrid, Av. Juan de Herrera, 4, 28040 Madrid, Spain |
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| Abstract: | Lime-based mortars containing pozzolanic additions of metakaolin, sepiolite and white Portland cement are studied in order to determine their performance as historic masonry conservation mortars. Hydration products on metakaolin-lime blended mortars include stable and metastable phases. The presence of such products has been studied by means of DTA and XRD analysis, concluding that the selection between them is mainly related with the water-lime ratio. Sepiolite addition to metakaolin-lime mortars has shown to inhibit C4AH13 formation. Therefore, the influence of phase distribution on the mechanical resistance is considered. Finally, compounds production on blended lime-white Portland cement was compared to natural hydraulic lime ones, and as a result, no remarkable differences appeared, apart from traces of possible cement Portland addition to the latter, usually not mentioned in the nominal composition supplied by the manufacturers of lime binders. |
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| Keywords: | Blended lime-cement mortars (D) Restoration mortars (E) Pozzolanic additions (D) Metakaolin (D) Thermal analysis (B) |
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