Tensile Strengths of Concrete Containing Rice Husk Ash from Different Calcination Methods

Ettu, L. O. and Ezenkwa, C. S. and Amatobi, D. A. and Onyezewe, E. and Ogbonnaya, P. (2016) Tensile Strengths of Concrete Containing Rice Husk Ash from Different Calcination Methods. International Research Journal of Engineering and Technology (IRJET), 03 (07). pp. 50-55. ISSN e-2395-0056, p-ISSN: 2395-0072

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Abstract

Rice Husk Ash (RHA) was produced using three different calcination methods namely: Open Air Calcination (OAC), Stove Calcination (SC), and Furnace Calcination (FC). OPC was partially replaced with RHA from each of the three calcination methods at 5%, 10%, and 15%. Nine concrete cylinders of 150mm x 300mm were produced for each of the three percentage replacement levels of OPC with RHA and for each of the three calcination methods, making a total of eighty one concrete cylinders with OPC-RHA binary blended cement. Nine control concrete cylinders, with same dimensions of 150mm x 300mm, were also produced using 100% OPC. The concrete cylinders were crushed to obtain their split tensile strengths at 28, 90, and 150 days of curing. Excel Spreadsheet Regression Analysis was used to develop empirical models for predicting the split tensile strengths of OPC-RHA concrete. It was found that whereas the split tensile strength of the control concrete at 28 days of curing was 0.88N/mm2, the greatest values of 0.87N/mm2 (FC), 0.82N/mm2 (FC), and 0.70N/mm2 (OAC) were obtained at 5%, 10% and 15% RHA replacement. The control split tensile strength value rose to 1.34N/mm2 at 90 days and 1.61N/mm2 at 150 days whereas the greatest 90 and 150-day split tensile strength values for the OPC-RHA concrete were 1.49N/mm2 and 2.01N/mm2. Among the three calcination methods, split tensile strength values for Furnace Calcination (FC) were highest, followed by values for Open Air Calcination (OAC), while values for Stove Calcination (SC) were generally lowest. OPC-RHA blended cement concrete could be used for all building and civil engineering works at 5-15% OPC replacement with RHA using RHA obtained from FC method, and at 5-10% OPC replacement with RHA using RHA obtained from OAC and SC methods, where early loading of the structural members are not required.

Item Type:	Article
Uncontrolled Keywords:	Concrete, Ordinary Portland Cement, Split Tensile Strength, Rice Husk Ash, Furnace Calcination, Open Air Calcination, Partial replacement.
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TP Chemical technology
Divisions:	Faculty of Engineering, Science and Mathematics > School of Civil Engineering and the Environment
Depositing User:	Patricia Nwokealisi
Date Deposited:	21 Oct 2024 14:10
Last Modified:	21 Oct 2024 14:10
URI:	http://eprints.covenantuniversity.edu.ng/id/eprint/18533

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