Abstract
The present research addresses the compositional and textural properties of bedding mortars from rubble stone masonries of a historic construction, built between 13th and 17th centuries and during different constructive periods (National Palace of Sintra, Portugal). The characterization of mortars established the basis for the formulation of compatible repair mortars. The mortars revealed similar composition and depended on the raw material locally available (calcitic binder and aggregates of granitic nature), whereas the textural features (b:a and aggregate gradation) varied significantly according to mortar use (interior/exterior walls; interior/exterior leaf of exterior walls). Statistical analysis on textural data allowed to propose different repair mortar formulations according to their use; one for interior walls (b:a ≈ 1:2) and two for exterior walls (b:a ≈ 1:3 and b:a ≈ 1:4).Besides, the research found consistent correlations between mortars’ characteristics and the historical background of the monument although further analyses are required for a definitive link between masonries materials and the constructive periods.
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