The Brazilian territory composes a vast network of ornamental stone production industries to consider the economic appeals of mineral extraction, where eventually, the engineering commitment is not the same in relation to waste disposal, which has a considerable environment impact. Within a context of sustainable development, this work seeks the reuse of marble and granite residues as load insertion in polymer matrix composite materials to evaluate the influence of granulometry on the physical-mechanical properties. For the production, we used the manual hand lay-up lamination manufacturing method associated with closed mold pressing. The mass proportions of marble and granite residue incorporated in the composites were 0 %, 5 %, 10 %, 15 %, 20 % and 25 %. The marble and granite residue was supplied by Brilasa Britagem e Laminação de Rochas S/A and sieved in the grain sizes of 100, 200, 325 and 400 meshs in Tyler’s series. Isophthalic unsaturated polyester resin was used as a polymer matrix, along with catalytic materials such as cobalt accelerator (1,5 % v/v) and Mek-p catalyst (1 % v/v). Morphological characterization by SEM and mineralogical analysis by ESRD in the residue were performed. Test bodies were created for the tests of composites such as physical characterization, which includes the determination of the apparent specific mass (ASTM D 792), apparent porosity (ASTM D 2734) and water absorption (ASTM D 570). The horizontal flammability test (ASTM D 635) was also performed, in addition to the tensile test (ASTM D 3039). The residue presented irregular morphology and the main minerals were identified as Quartz, Albite and Mica. The physical characterization indicated in the composites that there was variation in the behavior of the properties according to the addition of the residue of marble and granite. The results showed in the flammability test that the composites were within the determination of ASTM D 635 to be classified as HB and within the CONTRAN/2014 standard, highlighting the 10 % RMG mass ratio in the 325 mesh particle size, that showed total extinction of the flame, in comparison to the other compositions. There was variation in the behavior of mechanical resistance according to the addition of residual load, but all composites presented good tensile strength, with emphasis on the 5% RMG ratio in 100 mesh granulometry with a resistance of 38.60 (MPa) an increase of 133,94 % in relation to the full matrix. This implies that RMG composites are suitable for the production of products such as internal coating in railcars and construction.
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