Adição de resíduo do polimento de porcelanato em argamassas de restauro à base de cal
Mortar coatings applied to historic buildings and artwork must be compatible with the pre-existing materials, thus contributing with both the restoration and preservation of heritage without affecting its architectonic value. Lime mortars consisting of fine aggregate ratio of 1:3 are softer than c...
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Principais autores: | , , , , |
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Formato: | article |
Idioma: | pt_BR |
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Endereço do item: | https://repositorio.ufrn.br/handle/123456789/31601 |
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Resumo: | Mortar coatings applied to historic buildings and artwork must be compatible with the pre-existing materials, thus contributing with both
the restoration and preservation of heritage without affecting its architectonic value. Lime mortars consisting of fine aggregate ratio of
1:3 are softer than cement mortars and therefore more adequate for restoration. The performance and durability of the conventional lime
mortar can be further improved in order to reduce the number of interventions. The addition of fine residues can contribute to this goal as
they fill the pores of the hardened mortar. The residue of porcelain tile polishing (RPP) is a fine material and can be added to the mortar
partially replacing the fine aggregate. Therefore, the present study aimed at evaluating the effect of the addition of RPP on the fresh and
hardened states of the lime mortar. Contents from 5 to 30 wt% of RPP were investigated and the properties of the corresponding mortars
were compared to those of the conventional mortar. In the fresh state, consistency, density, water retention and air content were measured.
Rectangular samples of each mortar composition were then dried and aged during 90 days to analyze the mechanical strength and
adherence. All tests are standardized by ABNT. The results revealed that mortars containing RPP depicted higher density and compactness
as a consequence of the reduction in the air content. Mortars with RPP contents between 10 and 20% showed enhanced properties in the
hardened state compared to the RPP-free mortar, including better retraction behavior, higher mechanical and adherence strength. The
addition of RPP, partially replacing the fine aggregate in lime mortar, resulted in mortar compositions with improved overall behavior for
restoration, and possibly longer durability, thus contributing to the architectural restoration and preservation of historical heritage with
fewer interventions |
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