CARACTERIZAÇÃO DO RESÍDUO DE PÓ DE VIDRO BLINDEX® PARA SUBSTITUIÇÃO PARCIAL DO CIMENTO NA MISTURA SOLO-CIMENTO

Abstract

Glass is a material that is present in several sectors of the economy, and as a result, the industrialization of glass generates a lot of waste in the different processes of its use. There are some projects that use this waste to manufacture ceramics and concrete, since it can be used as a raw material for other composites. A compound widely used in paving layers is soil-cement, since cement chemically stabilizes the soil, increasing the resistance of the mixture. Given this composite material, we sought to innovate with a new soil-cement composition, using industrial glass waste, with the purpose of contributing economically to the paving sector and consequently to the environment, minimizing the amount of waste sent to landfills. The work was developed following some steps, that is, the first step was to obtain the precursor material, where the samples obtained were taken as industrial waste in the form of high viscosity sludge, during the glass plate polishing stage, then the samples were subjected to a dehydration and refinement process, resulting in a powder with a particle size of around 46 mesh, representing our main precursor. In the second step, the precursor samples of glass powder were subjected to characterization processes, using the auxiliary techniques of X-ray diffraction, thermal analysis (TG and DSC), scanning electron microscopy (SEM) coupled to EDS. In the third step, the samples were subjected to mechanical tests of the specimens, to verify the possibility of partial and/or full replacement of cement in the soil-cement mixture observing the minimum acceptance parameters of DNIT Standard 143/2022 - 2.1 Mpa of simple compressive strength in 7-day curing. The results found in the TG thermal analysis tests showed a mass loss of 5.7% with a temperature gradient of 1,100 °C for the standard glass powder sample; the DSC presented an endothermic peak in the range of 700 °C to 820 °C, corresponding to the glass transition process, and, from 870 °C onwards, the material presented an ascending slope of excellent thermal stability. The SEM results showed, through the micrographs, a granulometry with polyhedral geometry and absence of phase precipitation. The EDS results confirmed the presence of Si, Na and Ca in higher concentrations. The X-ray diffraction results showed an amorphous structure. The results related to the mechanical tests with the soil-cement and soil cement-glass powder CPs demonstrated that the glass powder contributes 35% and 42% of tensile strength by axial compression when compared to the soil-cement with 5% and 7% of cement, respectively. Therefore, the results presented by the composition using glass powder demonstrate that it is a new material with physical-chemical properties, very promising in the application of paving within the DNIT 143/2022 Standard, being able to significantly replace a certain percentage of cement, contributing economically to the transportation sector.