Avaliação da resistência à compressão de solo argiloso com adição de cimento e resíduo de marmoraria

Abstract

In response to the heating of civil construction, there is an increase in demand for ornamental stones, marbles and granites, which are focused on adding commercial value to constructions in general, being used mainly in floors and countertops. However, these are not just positive points when talking about the optimistic scenario regarding the demand for these rocks, since the same, before being incorporated into environments, need to undergo previous treatments carried out in marble factories. These treatments culminate in the generation of the so-called marblework residue (RDM), becoming a problem when disposed of improperly, being harmful mainly to the environment (soil, air, water, fauna and flora) and human health. In this sense, this work aimed to analyze, in terms of mechanical strength, how a clayey soil behaves after compaction with the addition of 3%, 5% and 7% of cement and 5%, 10% and 30% of marble waste. For this purpose, the soil and marble work residue were first collected and later the granulometry and Proctor Normal compaction tests were carried out. Afterwards, cylindrical specimens of 5.0 cm in diameter and 10 cm in height were molded with compacted clayey soil with the addition of different levels of cement and residue. Once the curing process of the specimens was concluded, tests were carried out to determine the resistance to simple compression. By granulometric analysis it was found that the soil used in this work has a clay fraction of 80% and the marble work residue is predominantly composed of fine particles, that is, particles passing through the 200 mm sieve. Regarding the compaction tests, there was a reduction in the optimum moisture content and an increase in the maximum dry apparent specific weight with the addition of residue to the cemented soil. However, for soil with residue addition, there was a reduction in specific weight and there were no significant variations in optimum moisture. The results of the simple compressive strength tests demonstrated that the maximum increase in strength occurred with the addition of 5% of RDM, and from that, there was a reduction in the compressive strength. However, with the results obtained, it can be inferred that it is possible to introduce RDM for soil stabilization, with the purpose of paving, stabilizing slopes, among others.