Publication Date : 01/02/2008

Author(s) :

D. Dahiru, I.K. Zubairu.

Volume/Issue :
Volume 3
Issue 1
(02 - 2008)

Abstract :

Rice is one of the most important food stuffs produced in Nigeria. However the processing of rice leads to the generation of large amount of waste - rice husk. The commonest method of disposing it is by burning the waste; this brings yet another waste - the Rice Husk Ash, [RHA] which serves no economic benefit apart from polluting the environment. The paper reports an investigation carried out on the compressive strength of concrete produced with RHA as partial replacement of OPC. A concrete of nominal mix 1:2:4 using two w/c ratios of 0.62 and 0.66 were used to produce concrete cubes of 150mmx150mmx150mm. Varying proportions (0%, 5%, 10%, 15%, and 20%) of RHA were used as a partial replacement of OPC in the mix. A total of 45 test samples were produced and tested. The setting time of RHA – OPC paste, workability, saturated surface density and compressive strength of the concrete were determined. Results showed that RHA has influence on the setting times because both initial and final setting times of paste with RHA have higher setting times. For example the initial setting time of concrete with 5%, 10%, 15% and 20% RHA are 2.02, 2.05, 1.55 and 1.40 hours respectively, as compared with the control specimen which has 1.30 hours. The steady increase in the initial setting time is also reflected in the final setting times. While the workability test results, using slump test are 20mm, 16mm and 12mm for 0%, 5%, and10% RHA respectively and consistency test results showed samples with 0%, 5%, 10% RHA and w/c ratio of 0.62 have compacting factor of 0.85, 0.83 and 0.86 respectively, both results showed that the workability of concrete with RHA is low. The compressive strength test result showed that the average compressive strength of concrete containing 5%, 10% 15% RHA are 21.22N/mm2, 22.09N/mm2 and19.79N/mm2, respectively this is closer to the compressive strength of the control concrete specimen which has average compressive strength of 25.32N/mm2. Like wise the density of all specimens with RHA are comparable to the normal concrete density.

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