Análise técnica e financeira da reciclagem de resíduos de construção civil: estudo de caso

• Ano de defesa: 2018
• Autor(a) principal: Santos, Davi Valente
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Palavras-chave em Português: Engenharia de estruturas; Reciclagem; Resíduos sólidos; Construção civil - Resíduos; Civil construction residues; Recycling; Management; Cost
• Link de acesso: http://www.repositorio.ufc.br/handle/riufc/33423

The production of waste from the construction industry represents 50% of the total urban solid waste generated globally. Some works deal with management from the generation of waste, removal from the site, processing of the material for recycling outside the generating work or analysis of costs of this recycling process outside the generating source. However, there are few studies on the economic viability of waste recycling at the site, considering the reverse logistics of the process and construction management, which is an important research gap. The present work has the general objective to evaluate technically and economically, in the light of concepts of sustainability and logistics, the recycling of Class A waste in works of large construction. The study was divided into four stages: 1) study of the chain of management and management of the company's RCC, 2) recycling of class A waste, 3) application of recycled aggregates and 4) evaluation of the use of recycled aggregates on site. Trace of subfloor mortar, internal and external paving, considering the replacement of sand by recycled aggregate of concrete and mortar, in the contents of 25% and 50%, in addition to the reference traces used in the company. The financial results indicate that the most efficient scenario would be the one that contemplates the grinding of waste, without possibility of recycling of the same and the acquisition of recycled aggregate. It is worth noting that the scenario that considered the recovery of the residue at the site had a cost of 12% above the financially more feasible case and 11% below the scenario that did not consider the crushing process or even the acquisition of a recycled aggregate. Regarding the properties of the mortar in the fresh state, the consistency, the incorporated air content and the mass density were evaluated. In these cases it was observed that there is significant difference only of the incorporated air content of the mortars with the recycled aggregates when compared with the mortars with natural aggregate. As regards the hardened state, the properties of bulk density, dynamic modulus of elasticity, tensile strength in bending, compression and adhesion, cracking and permeability were verified. It was observed that all the properties presented cases of significant and non-significant differences between the mortars. It was also observed that the cracks were reduced with the substitution of natural sand for recycled aggregate and that, in terms of adhesion, external plaster mortars with recycled aggregate increased up to 40% in relation to the natural sand trace.