Utilização de resíduos de construção e demolição na fabricação de blocos de concreto estrutural com adição de óxido de grafeno

• Autor(a) principal: Ramos, Elizabeth das Chagas
• Data de Publicação: 2020
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações do Mackenzie
• Texto Completo: https://dspace.mackenzie.br/handle/10899/28442
• topic: nanomateriais; óxido de grafeno; concreto; resíduos de construção civil; CNPQ::ENGENHARIAS

The increased demand for obtaining and improving materials that are more durable and efficient in the construction industry, presents an opportunity invaluable for the development of new materials with the application of nanomaterials and the use of construction and demolition waste (CDW) generated within the construction industry. Graphene oxide (GO) stands out for being a two-dimensional nanomaterial based on carbon that when added to concrete in low proportions modifies the hydration mechanism of Portland cement and its microstructure, improving its compressive strength. The dispersed GO water was purchased at the Technology Center for Nanomaterials and Grafene (CTNANO) for use in this work. For the manufacture of blocks structural construction waste was used, being reusable or recyclable waste such as aggregates and demolition, renovation and pavement repair waste, including soil from earthworks, ceramic components (bricks, blocks, tiles, cladding plates, mortar and concrete, pieces pre-molded in sthe crushing of Class A Type materials, according to CONAMA RESOLUTION number 307/2002 and number 469/2015, and were made available as aggregates (Grit and Gravel 0). For the execution of the concrete used in the manufacture of the structural blocks, the following were added: Portland cement of high initial strength - CP V ARI, aggregates recycled materials, stone powder and water, subsequently received addition of graphene oxide in aqueous dispersion, in order to improve your it`s strenghth. The structural block obtained was characterized through mechanical and microstructural tests. To evaluate properties of the materials used to make the materials used to make the blocks and the final product obtained, until now, tests have been made on the specific mass of the aggregates, moisture content of the aggregates test, unit mass test, determination of the granulometric composition of aggregates, dimensional analysis and determination of compressive strength, determination of water absorption and liquid area, determination of shrinkage by drying, resistance to hollow prism compression, x-ray fluorescence and microscopy optics. The results showed that the addition of graphene oxide in dispersion water,in concentrations between 0,015% and 0,08%, caused a 112% increase in resistance to compression and decreased the water absorption of the structural block. Key words: nanomaterials, graphene oxide, concrete, construction waste (CDW)