Avaliação das propriedades físicas e mecânicas de microconcretos com substituição parcial do cimento por resíduos cerâmicos

Abstract

Cement is the second most consumed product in the world, it lost only to water. This motive has led several researchers to seek new materials that can partially replace the use of cement, with lower cost and less impact on the environment. The use of industrial waste such as ceramic waste (CW) in partial replacement of Portland cement (PC) in the production of pastes, mortars and concretes, reduces the cost of the raw material, besides being able to contribute to the environment, since each ton of PC produces a tonne of carbon dioxide (CO2) that is released into the atmosphere. In this way, the CW can be used as raw material in civil building, minimizing the environmental impact and in a sustainable way generating employment and income for the communities of the Ceramic Polo. In this context, an experimental program was implemented to evaluate different levels of CW (0%, 10%, 20%, 30%, 40% and 50%) in the partial replacement of Portland cement. Physical tests (specific mass, particle size, X-ray diffraction and TG / DTG thermogravimetry) and chemical tests (X-ray fluorescence) were used to characterize CW and PC and mechanical tests (axial compression at 7, 14 and 28 days) in microconcrete characterization. The results indicated that the CW had pozzolanic properties according to the norm NBR 12653: 2014 and that the microconcretes produced with the content of 30% CW showed the highest reduction of the calcium hydroxide content (about 62%) and better properties mechanics, with strenght of the order of 55.63 MPa and 62.00 MPa at 14 and 28 days, respectively. These results point out the potential of CW as pozzolanic material in the production of microconcretes.