Produtos Alternativos na Produção de Blocos para Alvenaria Estrutural

The purpose of this research was to evaluate the potential use of residues from sawed Pinus spp. wood, in substitution to the fine aggregate of concrete used in the production of blocks for structural masonry. The partial substitution of Portland cement in concrete by silica fume, fly ash and rice husk ash, was also analyzed. The evaluation of the physical and mechanical characteristics of the concrete was determined in agreement with the ABNT normalization. Substitutes to the fine aggregate were tested by tenors of 50% of Pinus spp. residue in natura, and then pre-treated with extraction in cold water for 48 hours. Chemical addictives (superplasticizer and accelerator) were also used. Satisfactory results were obtained with substitutions of 50% of the mineral fine aggregate by the Pinus spp. residue, 10% of silica fume, 5% of fly ash, and 30% of rice husk ash .