Estudo da utilização de cinzas pesadas de termoelétricas para produção de blocos de concreto para pavimentos intertravados

• Ano de defesa: 2018
• Autor(a) principal: Alcantara, Maria Regilene Gonçalves de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Palavras-chave em Português: Transportes; Pavimentos; Usinas termoelétricas - Resíduos; Resíduos - Reaproveitamento; Resíduos como material de construção
• Link de acesso: http://www.repositorio.ufc.br/handle/riufc/40393

The construction and paving sectors have great potential to absorb wastes that can be used in the manufacture of Concrete Blocks for Interlocking Pavements (CBIP), making it an important engineering solution. Based on this alternative, the study had as objective to test the bottom ash, from a thermoelectric of the state of Ceará, in the substitution of natural fine aggregates in the manufacture of CBIP. In order to do so, it was collected ashes of the thermoelectric and conventional aggregates for the measurement of a reference trace and alternative traces of substitution. Initially, tests were carried out to characterize the materials, dosage and manufacturing of the concrete, as well as mechanical and environmental tests of the blocks according to normative specifications. The concrete for the blocks with wix of Reference (TR) and Traces (T) in the percentages of T10, T20, T30, T40 and T50 of substitution in its small fraction by ash was fabricated. Tests were performed on the concrete in the fresh state, of all traces, by the "VeBe" consistometer test method being classified as "extremely dry" concrete. All block were approved for visual inspection, dimensional assessment and abrasion wear. However, in the case of the compressive strength test, it was found that all traces, including TR, presented values lower than 35Mpa at 28 days of cure. Environmentally bottom ash and blocks were classified as non-hazardous and non-inert waste. It is concluded that the traces used in the manufacture of CBIP with bottom ash and natural aggregates, according to the evaluation of ABNT NBR 9781: 2013, can not be used for traffic of light vehicles and commercial vehicles of line, but can be used in environments with overloads such as sidewalks, squares and cycle paths.