Effect Of Partial Replacement of Fine Aggregate Using Rice Husk Ash in Concrete Mixture

Abstract

This study was carried out to assess the Effect of partial replacement of fine aggregate using rice husk ash in concrete mixture. The study was performed by replacing percentages of fine aggregate with rice husk ash in order to produce a concrete of minimum compressive strength of 16.9  for structural lightweight concrete. A total of 45 concrete cubes of 150 x 150 x 150(mm) was casted and cured. The percentage of rice husk ash were limited to 0%, 5%, 10%, 15%, and 25% by volume. The workability, slump and particle size analysis of the samples were monitored. The compressive strength, water absorption and comparative weight loss at the curing age of 7days, 14days and 28days were also conducted. The study found out that the compressive strength decreased with increase in the proportion of rice husk ash and the concrete workability decreased with the increase in the proportion of rice husk ash at a constant water-cement ratio. From the result of the experimental analysis carried out, the optimum partial replacement by volume of (80% sand and 20% RHA) gave the recommended compressive strength of 16.9