Possibilidade de incorporação de cinza volante e cinza de casca de arroz na produção de Engineered Cementitious Composites

Abstract

Engineered Cementitious Composites - ECC - are a special type of high performance cementitious composite reinforced with fiber, whose main characteristic is the high ductility. ECC are composed of cement, pozzolanic material, aggregate and polypropylene fibers. The present study aimed to evaluate the possibility of using pozzolanic materials produced in the southern Brazil, namely: rice husk ash (with and without controlled burning process) and fly ash, wastes originated from the rice and electric power industry. Mix design was determined, combining cement, rice husk ash (with and without burning control), fly ash, sand with particle sizes of 75µm and 150µm and polypropylene fibers. Following the characterization of materials, specimens with six different mix design were produced and subjected to compression and bending tests. Due to the use of pozzolanic material, tests were performed in two ages, 56 and 91 days. Images of fibers and cement paste interface were also evaluated, by scanning electronic microscopy. Finally, the effect of strain hardening was evaluated. Results demonstrate that the use of pozzolanic materials studied in this research is feasible, to produce ECC.