Avaliação das propriedades de argamassas armadas com adição de resíduos da geração termelétrica

Abstract

The effect of additions in mortars and, in place of cement, demonstrate improvements in the durability of structures. Based on these aspects, this research had as general objective to evaluate mortars with and without reinforcement, in a hardened state, with additions of residues of thermoelectric generation, AF (CV) and the by-product of gas desulfurization (SP), partially replacing Portland cement. The experimental methodology consisted of: a) Characterizing the residues. b) Perform mechanical tests on mortars at different curing times. c) Evaluate the corrosion of the built-in reinforcement in the mortars. d) Estimate the reduction of CO2 emissions by partially replacing the with mineral addition. The results showed that: 1) CV are composed of mulite, quartz and hematite and is characterized as a 65% amorphous material with an average diameter of 42.19 µm, mesoporous and with a specific surface area 28.4 m2g -1 . SP is 40% amorphic material rich in calcium sulfate with an average diameter of 17.8 µm and specific surface area 18.20 m²g-1 . 2) The addition of 6% CV improves the mechanical performance of the mortar at 28 days of curing. 3) The state of immunity of the reinforcement predicted by the Ecorr was not evidenced when analyzing the values of the icorr and the corrosion rate, which assumes a tendency to corrosion. Based on the icorr, it was demonstrated that the armor embedded in the mortar with CV is passive from 30 days. 4) With the addition of 6% CV, at 209.76 is issued.