Rice husk ash (RHA) is an agro waste and a natural pozzolana that is silica-rich and globally found in abundance. This thesis examined the RHA pozzolanic properties from seven different sources in Nigeria (Ogoja, Abakaliki, Adani, Adikpo, Obubra, Makurdi and Vandikya). The elementary chemical composition of this natural pozzolan is found to differ depending on its location. Samples from Ogoja, followed by Abakaliki, Adani, Adikpo, Obubra, Makurdi and Vandikya, were identified to have the highest pozzolanic properties. Their silica content was found to be 84.55%, 76.3%, 70.12%, 70.11%, 64.67 percent, 55.55 percent, and 48.4 percent respectively. As partial substitutes for ordinary Portland cement, four of the seven samples with the highest pozzolanic values were used at 5, 10, 15, 20, 25 and 30 percent replacement levels. The concrete mix ratio of 1:1.5:3 was adopted and the compressive strength values were found to be in the range of 37-42N/mm2 at 5% RHA, 35-39.5N/mm2 at 10% RHA, 30-34.5N/mm2 at 28 days at 5% RHA, 35-39.5N/mm2 at 10% RHA, 30-34.5N/mm2 Compared to the monitored sample, with a strength value of 15 percent RHA, 27-29N/mm2 at 20 percent RHA, 22-25.6N/mm2 at 25 percent RHA and 21-24N/mm2 at 30 percent RHA 42.64N/mm2. Approx.
Author (s) Details
Dr. G. A. Akeke
Department of Civil Engineering, University of Nigeria, Nsukka, Enugu State, Nigeria.
D. E. Ewa
Department of Civil Engineering, Cross River University of Technology, Calabar, Cross River State, Nigeria.
F. O. Okafor
Department of Civil Engineering, University of Nigeria, Nsukka, Enugu State, Nigeria.
View Book :- https://bp.bookpi.org/index.php/bpi/catalog/book/330