Modelling and Optimisation of Compressive Strength of Rice Husk Ash (rha) Concrete Using Scheffe’s Theory
Year: 2025
Type: article
Abstract: The study covered the development of model for predicting the compressive strength of rice husk ash (RHA) concrete at 28 days curing age for materials sourced from Afikpo-North Local Government Area of Ebonyi State, Nigeria using Scheffe’s (5, 2) simplex lattice design theory to enhance the usage of rice husk ash in order to reduce the cost of cement and concrete production. A total of 30 mix ratios were used to produce 90 concrete cubes of 150mm x 150mm x 150mm size to develop the model and test adequacy using Fisher’s test at 95 percent confidence level. The Scheffe’s regression model was used to generate the mathematical equation= 28.27X1 + 23.13X2 + 21.35X3 + 20.56X4 + 19.38X5+ 7.64X1X2 – 1.84X1X3 – 2.90X1X4 – 9.26X1X5 + 0.04X2X3 – 2.10X2X4 – 2.42X2X5 – 1.78X3X4 – 1.70X3X5 – 2.04X4X5 that gave the highest compressive strength of 28.27 N/mm2 corresponding to a mix ratio of 0.50:0.95:2.00:4.00:0.05 for w/c ratio, cement, sand, granite and RHA respectively and the minimum compressive strength of 19.38N/mm2 corresponding to mix ratio of 0.70:0.75:1.70:3.70:0.25 for w/c ratio, cement, sand, granite and RHA respectively. The study recommended that the rice husk ash used as partial replacement of cement for the model developed should not exceed 17.5% in order to achieve grade C20 concrete. This paper has first appeared in Afrisophia: Journal of African Experiment, Thought and Experience which is published by Academia Africa..
Source: Figshare
Authors: Ogbonnia, Elechi Emmanuel, Ezeali, Samuel Onyekachi, Nwalo, Ejike Emmanuel, Makinde, Christopher Oluwaneye, Ajah, Ndubuisi
Language: English
Subfield: Civil and Structural Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W6902264258
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