Uso de cinza de bagaço de cana-de-açúcar na produção de concretos especiais para aplicação em meios agressivos de instalações agroindustriais

• Autor(a) principal: Santos, Luciana Alvarenga
• Data de Publicação: 2013
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/770
• topic: Cinza de bagaço de cana-de-açúcar; Produção de concretos especiais; Instalações agroindustriais; Sugarcane bagasse ash; Production of special concretes; Agricultural industries; CNPQ::CIENCIAS AGRARIAS::ENGENHARIA AGRICOLA

This study aims to evaluate the mechanical properties of concretes in which the cement was partially replaced by sugarcane bagasse ash (SCBA). Three different ashes were investigated in terms of their physical and chemical properties in order to establish the more adequate as a mineral admixture. The bagasse processing involved preliminary drying, burning and sieving, chemical treatment, controlled burning and grinding. Three types of SCBA were obtained from these processes: a) ash processed by the sugar plant as a biomass for energy generation ( as received ash); b) ash (a) submitted to a controlled burning process and; c) ash treated by acid attack prior to the controlled burning process. The concretes were designed considering their application in the floor of a swine barn and the samples were produced with 12% replacement of cement by SCBA. For the durability assessment, the concrete samples were exposed to acid attack by acetic and lactic acids and to abrasion wearing. Attack by acetic acid has shown to be more aggressive than lactic acid and the. Also, the 21 days used for the acid attack was adequate, as far as the concretes presented reduced strength and acid solution has it pH decreased. xxiiUnder the test conditions applied, the three ashes resulted in concretes suitable for the application proposed. The as received ash was considered more effective once it enhanced the concrete strength and its resistance to the acid attack and abrasion without the need for additional processing.