Estudo das propriedades mecânicas do concreto com adição de cinza de casca de arroz

• Autor(a) principal: Pereira, Adriana Maria [UNESP]
• Data de Publicação: 2015
• Outros Autores: Rufino da Silva, Carlos Adriano [UNESP], Araujo Queiroz, Daniela Cintra de [UNESP], Bassan de Moraes, Maria Julia [UNESP], Pinheiro Melges, Jose Luiz [UNESP], Tashima, Mauro Mitsuuchi [UNESP], Akasaki, Jorge Luis [UNESP]
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://www.scielo.br/scielo.php?pid=S1517-70762015000100021&script=sci_arttext&tlng=en; http://hdl.handle.net/11449/129513
• topic: Portland cement; Concrete; Thermal curing; Strength; Rice husk ash; Cimento Portland; Concreto; Cura térmica; Resistência mecânica; Cinza de casca de arroz

The thermal curing is a process used to accelerate the hydration reactions of the Portland cement in mortar and concrete elements, in order to achieve gains in mechanical strength at early ages, since the temperature acts on the degree of these reactions. On this way, it is important to assess the mechanical behavior of concretes with mineral additions. The rice husk ash (RHA) is a residue that lies among the most studied additions in the concrete composition. The reuse of RHA besides reduce the environmental problems, can cause an increment on the mechanical strength of mortars and concrete, even when is used in partial substitution of Portland cement. This paper presents experimental results of the compressive strength, of the tensile strength (obtained by the split test), and of the modulus of elasticity for concrete prepared with RHA, incorporated into the mixture at dosages of 5% and 10% (by mass), in substitution of the cement. The RHA was produced through the uncontrolled burning of rice husk. The concrete mixtures were defined from an evaluation of the mechanical properties of specimens that were made with and without the addition of RHA. The process of thermal steam curing of the concrete was developed in cycles of 6 hours, at a constant temperature of 80 degrees C. The results showed higher strengths for specimens that were made with the addition of RHA.