Conventional coarse aggregates, extracted from natural sources, pose environmental challenges such as habitat destruction, resource depletion, and high energy consumption. To mitigate these effects, this study prepared geopolymer aggregates (G.A.) using fly ash–GGBFS and an alkali ac- tivator solution through pelletization. Furthermore, two aggregate drying methods, oven drying, and ambient air drying, are adopted to evaluate their optimal performance through physical and mechanical tests. The results Indicated that oven-dried geopolymer aggregates exhibited optimal behavior in all experimental aspects compared to ambient air-dried aggregates. Specifically, the 80% fly ash–20% GGBFS mixed aggregates demonstrated lower crushing value (20.80%), impact value (24.7%), water absorption (13.67%), and abrasion values (7.01%) than other mixes. No considerable difference was observed in the density and specific gravity of aggregates between the two drying methods. Subsequently, these aggregates were used as a 100% replacement for conventional coarse aggregates in concrete, and the concrete's mechanical properties, such as compressive, split tensile, and flexural strengths, were investigated. Please update the following sentence in place of the highlighted sentence. The mix M3 (i.e., 80% fly ash–20% GGBFS mixed aggregates incorporated concrete) showed superior performance and are considered the opti- mum mix. Specifically, in the compressive strength results, the mix M3 showed a 26.31% and 14.28% strength increase compared to the 100% fly ash aggregates incorporated concrete mix in oven-dried aggregates and ambient-dried aggregates incorporated concrete, respectively. The lin- ear regression equation derived from the experimental results was used to predict the split tensile and flexural strength, showing a good correlation between the experimental and expected results.
Alkali activator solution compressive strength environmental impacts geopolymer aggregates water absorption
Primary Language | English |
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Subjects | Construction Materials |
Journal Section | Research Articles |
Authors | |
Early Pub Date | June 15, 2024 |
Publication Date | June 24, 2024 |
Submission Date | April 20, 2024 |
Acceptance Date | June 10, 2024 |
Published in Issue | Year 2024 Volume: 9 Issue: 2 |
Journal of Sustainable Construction Materials and Technologies is open access journal under the CC BY-NC license (Creative Commons Attribution 4.0 International License)
Based on a work at https://dergipark.org.tr/en/pub/jscmt
E-mail: jscmt@yildiz.edu.tr