Sawdust Ash as a Sustainable Binder in Geopolymer Concrete: A Study on Split Tensile Strength
DOI:
https://doi.org/10.70112/ajeat-2024.13.1.4236Keywords:
Geopolymer Concrete, Sawdust Ash, Split Tensile Strength, Pyrolysis, MATLABAbstract
Geopolymer concrete can serve as a more environmentally friendly alternative to traditional cement by reducing the release of greenhouse gases during production. It is composed of an alkaline liquid containing sodium or potassium silicate and sodium or potassium hydroxide, along with a source material rich in silica and alumina. In a recent investigation, thirty geopolymer concrete samples were created in the laboratory using a mix design approach. The study focused on optimizing the split tensile strength of the concrete, particularly when using sawdust ash as the source material. The research revealed that subjecting sawdust ash to pyrolysis in the absence of oxygen significantly affects its pozzolanic characteristics and, consequently, the properties of the concrete. The study determined the optimum split tensile strength of sawdust ash-blended geopolymer concrete to be 2.9899 MPa. The specific concentration ratios of NaOH, Na₂SiO₄ to NaOH, sawdust ash in the binder, water to binder, and activator to sawdust ash were found to be 9.75, 1.8750, 37.5, 0.025, and 2.5, respectively. Additionally, computer programs developed using MATLAB were employed to optimize and predict the ideal mix proportion of sawdust ash-based geopolymer concrete.
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