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Grilo, J.; Faria, P.; Veiga, R.; Santos Silva, A.; Silva, V.; Velosa, A. New natural hydraulic lime mortars Physical and microstructural properties in different curing conditions. Construction and Building Materials, v. 54, p. 378-384, 2014. March 2014 1 Keywords (max. 10 words)EN 459-1:2010; natural hydraulic lime; mortar; curing condition; metakaolin; laboratory characterization Grilo, J.; Faria, P.; Veiga, R.; Santos Silva, A.; Silva, V.; Velosa, A. New natural hydraulic lime mortars Physical and microstructural properties in different curing conditions.

This work evaluates the influence of the binder:aggregate ratio in respect to mineralogical and mechanical properties of air lime-metakaolin mortars.Mineralogical analysis showed that binder:aggregate ratios modifies the extent of carbonation and pozzolanic reactions with curing. The pozzolanic reaction occurs mostly at lower curing times (28 days), while, at higher curing ages, carbonation reaction is mostly dominant. The exceptions are mortars with 1:1 (air:lime) volumetric ratio with 30% and 50% MK in which the pozzolanic reaction is still dominant.For conservation purposes, the mechanical tests demonstrated that 1:2 and 1:3 mortar volumetric ratios were considered adequate proportions since 1:1 was considered a "strong" ratio, as it can induce tensions and mortar shrinkage that can damage historic masonries. Keywords

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