Análise comparativa de ensaio à compressão de tijolos de adobe (terra crua) com adição de lodo de ETA e ETE

Abstract

In view of the problem of disposing of sludge produced in the treatment of water and sewage, options that are useful and feasible for the disposal of solid waste have become a demand of public and governmental interest, given the various impacts that emerged with the disposal improper. Based on this problem, the present study sought to evaluate the possibility of disposing of dewatered sludge from ETA and ETE in the ceramic industry, as an additive in adobe bricks. For this, matrix bricks were molded, without the addition of sludge, to be taken as a base; bricks with the addition of 20% ETA sludge; bricks with the addition of 20% ETE sludge; and bricks with a mixed addition of 10% ETA sludge with 10% ETE sludge. With this, an investigative work was carried out through 4 different types of adobe bricks, evaluating and controlling the mechanical behavior under the compression effort. After the compression test was carried out, it was observed that none of the bricks showed a condition of use, since their strengths were below that recommended by the NBR 16814:2019 standard project, which is 1.5 MPa. In addition, in relation to the matrix brick, the bricks with the addition of ETE sludge had an average reduction of about 22.8%; bricks with ETA sludge had an average reduction of about 18.6%; and the bricks with the addition of the mixture of ETE + ETA showed a reduction of 10.9%, considered the smallest and, therefore, representing the option that has the characteristics closest to the matrix brick. The bricks with the addition of ETA sludge and the bricks with the addition of the ETE + ETA mixture showed similar average strength values, indicating that the mechanical behavior of the two are similar.