Análise da adição de resíduo de serragem da pedra Cariri como fíller na produção de argamassa

• Ano de defesa: 2019
• Autor(a) principal: Garcia, Pedro Henrique Nogueira
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Palavras-chave em Português: Ciência dos materiais; Argamassa; Resíduos - Reaproveitamento; Agregados (Materiais de construção); Pedra cariri; Stone Cariri; Residue
• Link de acesso: http://www.repositorio.ufc.br/handle/riufc/50371

The Cariri region, located in the state of Ceará, has significant limestone reserves. The use of this ore occurs mainly in two ways, namely: sedimentary limestone, in the form of blades applied to floors and coatings; and metamorphic limestone as raw material in lime production. The exploration and processing processes of laminated sedimentary limestone generate residues such as the Cariri Stone Sawdust Residue (RSPC). Such processes are pointed in the literature as promoters of environmental impacts due to the inadequate management and disposal of RSPC. Because of this, the present study aims to analyze the influence of the addition of RSPC as partial substitute of fine aggregate in the manufacture of mortars. To this end, RSPC was added in two steps: initially as a partial substitute for sand and then for cement. The following mass contents were used for substitutions: 15%, 25% and 35%. The adopted trait was 1: 5, inmass with a consistency index of 260 ± 5 mm, with an a / c factor of 0.5. Six specimens were molded for each trait that will be tested at 7, 14 and 28 days. Then, the properties of fresh mortars (retained water content, incorporated air content, density and workability by squeeze-flow) and hardened properties (flexural tensile strength, axial compressive strength) were analyzed. shrinkage by drying, absorption by immersion and voids index). This research improved both the physicochemical properties of fresh and hardened mortar when its natural aggregate was replaced by RSPC. However, the shrinkage was higher for mortars with RSPC. Therefore, it was concluded that up to 35% of RSPC can be used in place of the natural aggregate. The mixtures with 25% by weight of the substituent have the best technological performances. Likewise, it is believed that the incorporation of this waste into the mortar manufacturing process will result in a reduction in input production costs when compared to the traditional method and a reduction in the environmental impacts that were generated from inadequate waste disposal.