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All Journal Andalasian International Journal of Applied Science, Engineering, and Technology
Munyua, Muthomi
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Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Energy Industrial & Manufacturing Engineering Mechanical Engineering

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The Mechanical Properties of a High Volume Natural Pozzolan Roller Compacted Concrete for Dams – Laboratory and Field Trials Karuge, Amos; Mumenya, Siphila; Abuodha, Silvester; Munyua, Muthomi
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 5 No. 2 (2025): July 2025
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v5i02.244

Abstract

This article reports the experimental findings of critical thermo-mechanical properties of RCC containing a high proportion of natural pozzolan as a supplementary cementitious material for Roller Compacted Concrete (RCC) dam construction, and was accomplished through laboratory and field trials. Natural pozzolan such as volcanic ash is a promising alternative to the industrial supplementary cementitious materials (SCM) such as flyash especially where the industrial SCM are economically unavailable as well as due to their expected shortage in the near future following greener energy sources and the need to reduce carbon emissions of concrete. Based on this research, the RCC with a cement replacement of up to 68% with natural pozzolan has produced satisfactory mechanical properties for dam construction and with nearly ideal thermal properties. The results are comparable to other international RCC dams and the RCC mix is considered appropriate for construction of a high quality and durable dam structure whilst contributing to sustainable construction.
Influence of Corn Cob Ash-Silica Fume Blend on the Mechanical and Durability Properties of Concrete Otieno, Linda Akoth; Abuodha, Sylvester; Mumenya, Siphila; Munyua, Muthomi
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 3 No. 2 (2023): July 2023
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v3i2.86

Abstract

— This research explored the feasibility of corn cob ash-silica fume blend in the production of pozzolanic cement to produce High-Performance Concrete. The cement in concrete was partially replaced by corn cob ash-silica fume blend in 5,10,15 and 20% by weight of cement and was compared to a control mix of 0% replacement. An intelligent mix design, Densified Mix Design Algorithm (DMDA), was used to effectively reduce both water and cement content. In order to create high strength and workability, a polycarboxylate-based super plasticizing admixture was utilized in conjunction with a low water binder ratio of 0.35. Compressive strength was appraised to determine the mechanical properties at days 3,7,14,28 and 56 to determine the optimum percentage replacement and compared to the control at the specific ages. With the optimum percentage replacement, the flexural test was investigated at 28 days. Water absorption and electrical resistivity tests were also investigated as potential indicators of durability. All of the blends that included corn cob ash and silica fume produced a higher strength than the control except 15 and 20%, with 10% replacement yielding a cube strength of 61 MPa at day 56.
Co-Authors Abuodha, Silvester Abuodha, Sylvester Karuge, Amos Mumenya, Siphila Otieno, Linda Akoth