Estudo da incorporação de lodo de ETA da cidade de São Gabriel/RS em tijolos de solo-cimento e avaliação das propriedades térmicas do material

• Ano de defesa: 2025
• Autor(a) principal: Kemerich, João Henrique Pinheiro
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Santa Maria; Brasil; UFSM; Programa de Pós-Graduação em Arquitetura, Urbanismo e Paisagismo; Centro de Tecnologia
• Palavras-chave em Português: Tijolo de solo-cimento; Lodo de ETA; Propriedades térmicas; Soil-cement brick; Water treatment plant sludge; Thermal properties; CNPQ::CIENCIAS SOCIAIS APLICADAS::ARQUITETURA E URBANISMO
• Link de acesso: http://repositorio.ufsm.br/handle/1/36778

A Water Treatment Plant (WTP) generates a significant amount of sludge, which makes its final disposal difficult due to the volume and characteristics of the waste. In the context of civil construction, this industry stands out as one of the largest consumers of material and energy resources. As a sustainable alternative, the use of soil-cement bricks, also known as ecological bricks, can be mentioned due to the lower energy consumption in their production. In addition to their favorable environmental properties, these elements have the capacity to incorporate industrial waste into their composition, allowing for the proper destination of materials potentially harmful to the environment. This research aimed to evaluate the possibility of incorporating sludge from a WTP into the production of soil-cement bricks. Furthermore, a low-cost thermal chamber was developed to analyze the damping and thermal lag behavior of a masonry wall built with this material, comparing its results with conventional ceramic brick masonry. As a criterion for assessing the feasibility of sludge utilization, the minimum requirements established by ABNT NBR 8492 (2012) regarding minimum compressive strength and maximum water absorption were adopted. The studied sludge was produced by the WTP of the city of São Gabriel/RS, in which a large amount of organic matter, quartz fine aggregate, and silt was verified. Initially, the reference mix was defined, in which the clayey soil had to be corrected with a large amount of quartz fine aggregate to meet the minimum requirements. Subsequently, the feasibility of partially replacing the soil with 5%, 10%, and 15% WTP sludge was evaluated. However, it was found that only the 5% replacement proved feasible, since higher levels compromised the integrity of the cementitious matrix, as shown by the results of the compressive strength test, Scanning Electron Microscopy (SEM), and statistical analysis. In the thermal tests, it was observed that the damping and thermal lag values of the masonry with and without sludge incorporation did not show significant differences. However, thermal damping was slightly lower and thermal lag higher compared to ceramic brick masonry