Influência da substituição parcial do cimento portland pela cinza do bagaço de cana-de-açúcar (CBC) residual no concreto

• Autor(a) principal: SILVEIRA, Daniel Antônio
• Data de Publicação: 2010
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• dARK ID: ark:/38995/0013000005g1m
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tde/651
• topic: Concreto; Adição Mineral; Resíduo Sólido Agroindustrial; Cinza do Bagaço de Cana-de-açúcar; 1.Cimento Portland - substituição - cinza do bagaço de cana 2.Cimento Portland 3.Cinza do bagaço de cana; Concrete; Mineral Addition; Agribusiness Solid Waste; Sugar Cane Bagasse Ash; CNPQ::ENGENHARIAS::ENGENHARIA CIVIL

The Sugar Cane Bagasse Ash (SCBA) is a major waste of the sugar cane industry and one of the most bulky solid wastes produced by Brazilian Industries. This industry annually produces millions of tons of SCBA from cane bagasse burning in the cogeneration of energy. According to Brazilian estimatives of sugar cane production to the year 2010, it is been expected a production of 697 million tons of sugar cane, that can generate more than 181 million tons of bagasse with 50% moisture and from that 4,5 millions tons of SCBA, if considering that all sugar cane will be used to milling and the use of bagasse as a fuel to boilers. The aim of the study was to evaluate the influence of the partial replacement of CPVARI Portland Cement by the residual SCBA obtained from an industry on the State of Goiás on mechanical properties of ordinary and high strength concrete, as well as properties related to durability. Concrete was characterized even fresh. The replacement content used were 0%, 5%, 10% and 20% of residual SCBA, in mass. Before use, the SCBA was subjected to a sieving process (opening mesh 1.19 mm), drying and grinding for 4 hours in a ball mill. Two water/ binder relations (w/b), 0.37 and 0.60 were adopted, resulting 8 different concrete types. The durability parameters were determined in transport mass assays and carbonation resistance. The transport mass assays, as permeability assays, capillary absorption and by immersion indicated an excellent level of replacement around 10% in both concrete. With regard to carbonation depth was observed a small reduction in carbonation resistance as the increased of replacement partial of Portland cement by SCBA. For the analysis of mechanical strength using the CBC residual levels up to 10% did not affect the concrete properties.