The Impact of Lime Content in Cement Mortar on the Shear Stress and Ductility of Perforated Brick Masonry Wallets

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The partial replacement of cement with lime can offer significant advantages in restoring historic masonry, as traditional mortar compositions were predominantly lime-based. This study examines how incorporating lime into jointing mortar affects the shear behavior of masonry wallets subjected to diagonal tensile tests. To this end, masonry wallets were constructed using mortars in which lime replaced cement at levels of 0%, 10%, 20%, 30%, and 40% by weight. The mechanical properties of the mortars were assessed through compressive and flexural strength tests and the shear behavior of the wallets was evaluated using diagonal tensile tests. The results indicate that substituting cement with lime increases the mortar ductility. Furthermore, the diagonal tensile tests showed that integrating lime into the mortars improves the overall performance of the masonry, suggesting that lime could be used as an alternative to restore historic masonry structures.

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