STUDY OF THE INFLUENCE OF THE RESIDUAL POWDER APPLICATION OF THE DRY GRINDING PROCESS OF CERAMIC PLATES IN INDUSTRIALIZED ADHESIVE MORTARS

• Autor(a) principal: Pereira Sartor, Renata
• Data de Publicação: 2021
• Outros Autores: Araújo Speck, Jaison, Savi, Aline Eyng, Piva, Jorge Henrique, Guglielmi Pavei Antunes, Elaine
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Institucional da UFSC
• Texto Completo: https://ojs.sites.ufsc.br/index.php/mixsustentavel/article/view/4425; https://repositorio.ufsc.br/handle/123456789/246586

The use of ceramic tiles is widely used in civil construction, especially in Brazil, due to the advantages it confers on the building. In the process of manufacturing ceramic tiles, many of them currently go through the grinding process, which consists of standardizing the dimensions and grinding the sides. As a result of the grinding process, a dry, fine grained residual powder (RRC - ceramic grinding waste) is generated. According to the tests performed, it has a high silica and alumina content, but an x-ray diffractogram verifies the presence of crystals. For the laying of ceramic tiles, industrialized adhesive mortars are traditionally used, which are essentially composed of hydraulic binder, mineral aggregate, additives (depending on the purpose) and water. Being correlated materials and seeking to analyze the possibility of reincluding the residue as a useful material in civil construction, the objective of this study was to verify the influences of the partial replacement of sand by Monoporous and Porcelain tile RRC, separately. For this, seven mix formulations were studied, being 1 standard and 3 different compositions in substitution percentages of 10, 15 and 20% for each type of waste. Tests were performed with the mortar in the fresh and hardened states, such as: consistency index, water retention, tensile bond strength, determination of open time and capillary water absorption. As a result, it was possible to observe that the inclusion of a larger fraction of fines in the mortar composition directly affects the characteristics of the mixture in the fresh and hardened states. The increase in the specific area of the mineral aggregate leads to a greater demand for paste in the compositions, which reduces the consistency index, the reduction of bond strength and the non-compliance with the open time of 15 minutes, according to the increase in the percentage of residue applied.