The role of rice husk ash (RHA) as cement replacement on the compressive strength of concrete

Abstract

The use of pozzolanic material from waste product as partial cement replacement in concrete contribute to reduce the environmental, economic problem through their waste and as well enhance the strength and properties of concrete. Rice husk ash (RHA) is one of the industrial waste that suitable used as cement replacement due to its pozzolanic properties which can enhance the properties of concrete. In this study, the workability, compressive strength and water absorption of the concrete containg RHA is investigate. Different burning temperature that are 650°C and 700°C and different RHA percentage of 5%, 15% and 25% were used in this study. The concrete cube of size 100mm x 100mm x 100mmwere prepared and cured for 7, 14 and 28 days. The study shown that replacing cement with 5% RHA at temperature 650°C increase the strength of concrete at 28 days while replacing cement with 5% to 15% RHA at 700°C increase the concrete strength at 28 days. The design mix of 15% replacement of cement with 700°C RHA has the highest compressive strength at all age of specimen compare with the other mix. The water absorption was increased with the increasing of the burning temperature and percentage of RHA replace.