Evaluation of mortars with calcium oxide and hydrated calcium sulfate for masonry joints
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Abstract
The use of lime and gypsum in mortars is crucial for the mechanical performance of traditional buildings. The objective was to evaluate the influence of calcium oxide and hydrated calcium sulfate on the compressive strength, type of cracking, and density of mortar used for masonry joints. Twenty-one briquettes were prepared with seven treatments: T1 (Control), T2-T4 with calcium oxide dosages, and T5-T7 with hydrated calcium sulfate, mixed with cement and sand in a 1:5 (v/v) ratio. The results showed that the compressive strength in T5 exceeded that of T1. Treatments T1, T2, and T5 exhibited conical cracking in 100% of samples. The density was highest in T4, followed by T1 and T5. The addition of hydrated calcium sulfate improves compressive strength, and conical and shear cracking are due to material imperfections. It was demonstrated that hydrated calcium sulfate increases the compressive strength of mortar to 144.47 kg/cm² compared to 139.87 kg/cm² for the control, but excessive addition reduces strength. These dosages also influence the type of cracking; however, they do not significantly affect density.
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