<p>The growth in the consumption of industrialized products has implied a considerable increase in the generation of urban solid waste, among which stand out the glass waste. The great technological advantage of glass is its high recycling potential, as well as the possibility of being molded into the desired shape, which contributes to various applications. In this sense, this work aims to analyze the efficiency of the heat treatments applied to green-soda-glass vitreous samples from the recycling of filling bottles, and compare with the hardness of the base glass. Initially the bottles were benefited and manually crushed for later sieving. Then, the vitreous residues were accommodated in an autoclaved cellular concrete (CCA) mold and subjected to heat treatments, which resulted in the melting and annealing of the pieces. Four distinct heat treatments were tested, with melting temperatures of 800ºC (20 min), 820ºC (20 min), 840ºC (15 min) and 840ºC (30 min). The obtained samples were analyzed by X-ray diffraction (XRD) and Vickers microhardness test. The results indicated that the fourth heat treatment (840ºC - 30min.) Gave higher hardness than the base glass and higher degree of crystallinity.</p>
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