Incorporação de resíduos de cerâmica vermelha como adição pozolânica na substituição parcial do cimento em argamassas

Abstract

The volume of waste generated each year has been growing worldwide and presents one of the most major problems for modern society. This work aims to analyze the incorporation of red ceramic waste generated during the production and transportation of ceramic blocks from Promac company as an alternative material for the production of mortars. In order to assess the feasibility of using them, the residues were previously crushed, sieved by through a 75 μm diameter pore sieve, its chemical composition was determined and mineralogical by fluorescence and X-ray diffraction. The index of pozzolanic activity with cement was determined. For this purpose, mortars partially replacing cement with residues in the proportion of 20, 25, 30 and 35%, and prismatic specimens were molded. The specimens were cured for 28 and 45 days and then the resistance to simple compression was determined. It was verified by the test activity index and water absorption that the mixture containing 20% ​​of ceramic waste after 45 days, can be recommended as suitable for partial replacement of cement in the preparation of mortars. Mortars for concrete blocks were formulated, partially replacing cement with waste in the proportion of 20, 25 and 30%, and the cubic specimens were molded. The bodies of cubic proofs were cured for 7 and 28 days and then resistance to simple compression of the cubic specimens, which was 16.2, 14.3 and 12.6 MPa for the proportions of 20, 25 and 30%, respectively. These results are satisfactory, since the NBR 6136 (1994) standard requires that resistance to simple compression is greater than 4.5 MPa after 28 days, for the mortar to be used for production of blocks. The results obtained are promising as regards the use of residues as additions pozzolanic.