Concreto autoadensável utilizando cinza de casca de arroz: estudo das propriedades mecânicas

• Autor(a) principal: Mendes, Cleiton João [UNESP]
• Data de Publicação: 2015
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/124468; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/18-06-2015/000837014.pdf
• topic: Construção civil; Concreto; Cinza de casca de arroz; Residuos agricolas; Resíduos industriais; Building

The research represents a study about the use of rice husk ash (RHA) as the final product for the production of self-compacting concrete (SCC). Therefore, was used rice husk ash produced on an industrial scale, Portland cement CP II-Z-32, tiny aggregate from sedimentary origin and larger aggregate from crushed type, beside super plasticizer steric and electrostatic action. The material properties were evaluated in fresh through the Slump-flow spreading assays, flow confined V-funnel, from Case L in bulk density and segregation by sieving. In the hardened state were evaluated the mechanical properties compressive strength, per meter compressive and tensile modulus at 7 and 28 days of curing, and also the water absorption test by immersion after 28 days of curing. The evaluation of the SCC's with rice husk ash was making comparatively with some concrete compositions vibrated in vibrating table produced with the same basic materials. It was observed that SCC's produced with RHA presented partially satisfactory compared to the tests in the fresh state. Great effectiveness of ash in meaning of tougher pulping hardened with higher values of mechanical properties even at higher water / cement relation, as well higher mechanical strength values compared to the same levels of absorption. It was found also values in relation to elastic modulus so that correlated to the compressive strength values give an indication of the greater ductility for the cases of SCC's