Mechanical and Microstructural Properties of Geopolymer Concrete Containing Fly Ash and Sugarcane Bagasse Ash

Mohammed Ali M. Rihan; Richard O. Onchiri; Naftary Gathimba; Bernadette Sabuni

doi:10.28991/CEJ-2024-010-04-018

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Mohammed Ali M. Rihan
moharihan20@gmail.com
1) Pan African University Institute for Basic Sciences, Technology, and Innovation, hosted at the Jomo Kenyatta University of Agriculture and Technology, Nairobi, Kenya. 2) Civil Engineering Department, Faculty of Engineering, University of Kordofan, El Obeid 51111,, Sudan
Richard O. Onchiri Department of Building and Civil Engineering, Technical University of Mombasa (TUM), Mombasa,, Kenya
Naftary Gathimba Department of Civil, Construction and Environmental Engineering, Jomo Kenyatta University of Agriculture and Technology, Nairobi,, Kenya
Bernadette Sabuni Department of Civil and Structural Engineering, Masinde Muliro University of Science and Technology, Kakamega,, Kenya

Vol. 10 No. 4 (2024): April

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Portland cement plays a vital role in construction and building projects. However, its manufacturing process releases detrimental pollutants and contributes to climate change. The environmental concerns linked to the manufacturing of conventional Portland cement, such as its high energy demands, raw material consumption, and significant CO₂ emissions, have prompted the need to look for alternatives such as geopolymer or green concrete. In addition, indiscriminate disposal of waste might have a detrimental effect on the environment. This paper investigates the mechanical and microstructural properties of geopolymer concrete incorporating fly ash and sugarcane bagasse ash as primary constituents. Sugarcane bagasse ash (SCBA) was employed as a partial substitute for Fly Ash (FA), with varying proportions ranging from 5% to 20% with increments of 5%. Alkaline activators utilized were NaOH (14M) and Na₂SiO₃, with a ratio of 1.5. Various tests, including the slump test, compressive strength test, splitting tensile strength test, and flexural strength test, were performed. The microstructural characteristics were assessed by scanning electron microscopy (SEM), energy dispersive analysis (EDS), and X-ray diffraction analysis (XRD). The results revealed that adding sugarcane bagasse ash influenced the workability of geopolymer concrete while enhancing its mechanical properties. The research findings have shown that the mixture comprising 5% SCBA has the greatest compressive strength of 64 MPa.

Doi: 10.28991/CEJ-2024-010-04-018

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Rihan, M. A. M., Onchiri, R. O., Gathimba, N., & Sabuni, B. (2024). Mechanical and Microstructural Properties of Geopolymer Concrete Containing Fly Ash and Sugarcane Bagasse Ash. Civil Engineering Journal, 10(4), 1292–1309. https://doi.org/10.28991/CEJ-2024-010-04-018

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Mechanical and Microstructural Properties of Geopolymer Concrete Containing Fly Ash and Sugarcane Bagasse Ash

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