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 propõe avaliar a atuação do polietileno tereftalato (PET) como um agregado substituto na fabricação de concreto para pavers, pavimento intertravado com peças de concreto, a fim de minimizar os efeitos colaterais da construção civil. PET triturado substituiu o agregado natural, pó de pedra, nas porcentagens de 10%, 15% e 20% em massa. Os testes mecânicos de resistência à compressão realizado aos 28 dias mostraram que os corpos de prova moldados a partir dos traços substituídos apresentaram significativa melhora da resistência à compressão, que a substituição parcial de 10% em massa de PET atende ao recomendado pela NBR 9781 (2013) para concreto para pavimentação e que todos os concretos produzidos atendem a resistência mínima a compressão de 20 MPa, recomendado pela NBR 6118 (2003) para concreto estrutural. Palavras-chave:PET; Pavers; Resistência à compressão; Construção civil. STUDY OF PARTIAL REPLACEMENT OF STONE POWDER FOR PET TO PAVERS MANUFACTURE AbstractThis work proposes the performance evaluation of polyethylene terephthalate (PET) as an aggregate replacement in the concrete manufacturing for interlocking concrete pavements, in order to minimize the side effects of the construction industry. Crushed PET replaced the natural aggregate, stone dust, in percentages of 10%, 15% and 20% by mass. The compressive strength test performed after 28 days showed that the specimens molded from the replaced mix showed significant improvement in compared to specimens molded by the reference mix PET in percentages of 10% by mass meets the minimum strength of 35 MPa recommended by NBR 9781 (2013) for pavers and all concretes produced meets the minimum strength of 20 MPa recommended by NBR 6118 (2003) for structural concrete.
RESUMO: Os materiais metálicos conhecidos como ligas com memória de forma (LMF) apresentam
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