Análise da utilização de filito como substituição de parcela do solo em tijolos de solo-cimento com resíduos de construção civil

Abstract

The using of phyllite in soil-cement bricks aims to provide an improvement in the characteristics of non-ideal soils, enabling the expansion of the production of soil-cement bricks. Thereby, it was proposed for this research to verify the influence of phyllite on soil cement bricks with 20% of civil construction waste, in order to assess your ability for use in sealing masonry. The influence of the use of phyllite on the bricks was defined by the analysis of the water absorption indices and the axial compressive strength of the bricks from the perspective of ABNT NBR 8461: 2012. The phyllite percentages tested were 20%, 30%, and 40% replacement of the soil portion of the brick with 20% RCC. The results shown that the insertion of phyllite in the bricks increases the percentage of water absorption and, according to the limit established by norm, only the elements with 40% substitution by phyllite exceeded the established limit of 18%, presenting the value of 23.31% of water absorption. For the results of compressive strength, none of the proposed elements obtained a resistance greater than 2 MPa at 7 days, where the greatest resistance bricks was the type TJ20 40 (with replacement of 20% of RCC and 40% of phyllite), with 1,88 MPa. For the tests at 28 days, the type elements TJ00 00 (without replacement), TJ20 00 (With the replacement of 20% of RCC and 0% of phyllite), and TJ20 40 (with replacement of 20% of RCC and 40% of phyllite) reached averages above 2 MPa. Therefore, based on the results and using the criteria defined by the ABNT NBR 8461: 2012 standard, none of the strokes can be used as sealing bricks due to the invalidity of the minimum resistance criterion at the age of 7 days. It was also found, through statistical analysis, that the replacement of phyllite had a significant effect on the results, influencing variably the resistance to axial compression and increasing the water absorption index of the elements.