This paper explored the effect of adding organic fibers from either bamboo or sugarcane on the mechanical properties of concrete. Cylindrical and prismatic specimens were made containing 2% and 5% v/w (volume to weight) of vegetable fibers to concrete. Following 28 days of curing period, the samples were evaluated for compressive strength, tensile strength using diametric compression, tensile strength during bending and static modulus. It was discovered that all concretes produced met the minimum strength of 20 MPa recommended by NBR 6118 for structural purposes, and it was observed an increase of the compressive strength on the specimens with addition of organic fibers. Moreover, an increase in the compressive strength was observed in the specimens with fiber addition, although no significant variation of water absorption was noticed when compared with the standard concrete. In conclusion, the concrete containing 2% v/w of bamboo fibers showed better mechanical strength and static modulus of elasticity when compared to both concrete with sugar cane fibers addition and the concrete without any additional fibers.
ResumoEste trabalho objetiva o estudo da influência da adição de fibras vegetais de bambu e cana-deaçúcar nas propriedades mecânicas do concreto. Para este trabalho foram confeccionados corpos-de-prova cilíndricos e prismáticos nos quais foram adicionados 2% e 5% em volume das fibras à massa do concreto. Após a cura, conforme NBR 5738 (2003) [1], os mesmos foram testados via ensaios de resistência à compressão conforme NBR 5739 (2007) [2], resistência à tração por compressão diametral, conforme NBR 7222 (2011) [3], resistência à tração na flexão conforme NBR 12142 (2010) [4] e módulo de elasticidade estático, conforme NBR 8522 (2008) [5]. Verificou-se após os testes que todos os concretos produzidos atenderam a resistência mínima a compressão de 20 MPa, recomendado pela NBR 6118 (2003) [6] para fins estruturais. Foi observado um aumento da resistência à compressão em relação à mistura padrão. O concreto com adição de fibras de bambu apresentou melhor resistência mecânica em relação ao concreto com adição das fibras de cana-de-açúcar e ao concreto sem adição. Abstract This work aimed to study the influence of the addition of vegetable fibers from bamboo and sugar cane on the mechanical properties of concrete. Implementing the same body-of-proof cylindrical and prismatic, which were added 2% to 5% per volume of fibers to the mass of concrete were made. After healing according to NBR 5738 (2003) [1], they were tested by testing of compressive resistance, according to NBR 5739 (2007) [2], tensile strength by diametric compression according to NBR 7222(2011) [3], tensile strength in bending according to NBR 12142 (2010) [4] and static modulus, according to NBR 8522(2008) [5]. It was found after testing all concretes produced met the minimum strength of 20 MPa recommended by NBR 6118 (2003) [6] for structural purposes. An increased compression resistance compared to the standard mixture was observed. The concrete with added bamboo fibers showed better mechanical strength compared to concrete with the addition of sugar cane sugar and plain concrete fibers.
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