Optmization of calculation method for determination of composition of hardened mortars of Portland cement and hydrated lime made in laboratory

This work presents a reviewed method for determining the composition of cement- and lime-based mortars and discusses the results obtained from the chemical characterization of Portland cement and hydrated lime mortars, which are currently being used in Brazil. It aims to assess the reproducibility level of the calculated proportion based on the figures of the chemical analysis of hardened mortars, while considering the nominal compositions established by the dosage. As the study was made with materials of known compositions the results permit suggesting the use of correction factor or adjustment to the calculation of the mix proportion, so that results very near the real dosage of materials can be obtained. The method of calculation can be applied to the mix proportion determination of new and historical mortars.