DEVELOPMENT OF LOW-CARBON GEOPOLYMER CONCRETE USING FLY ASH AND INDUSTRIAL SLAG AS SUSTAINABLE MATERIAL ENGINEERING
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Fly Ash, Geopolymer Concrete, Industrial Slag
Abstract
The construction industry is a major contributor to global carbon emissions, with traditional Portland cement production accounting for approximately 8% of total CO? output. The development of low-carbon alternatives is essential to achieving sustainability goals and reducing the environmental footprint of infrastructure. This research focuses on developing geopolymer concrete using fly ash and industrial slag as sustainable raw materials, offering a viable substitute for ordinary Portland cement. The objective of the study is to evaluate the mechanical performance, durability, and carbon footprint reduction potential of geopolymer concrete mixtures under varied proportions of fly ash and slag. A quantitative experimental method was employed, involving the synthesis of multiple mix designs with differing binder ratios, followed by compressive strength testing, microstructural analysis, and lifecycle assessment (LCA). The results indicate that the optimal blend of 60% fly ash and 40% slag achieved a 42% reduction in carbon emissions compared to conventional concrete while maintaining a compressive strength exceeding 45 MPa after 28 days of curing. The inclusion of slag significantly enhanced early strength development and chemical stability due to calcium enrichment, while the use of fly ash contributed to long-term durability. The study concludes that fly ash–slag–based geopolymer concrete represents a promising low-carbon alternative, combining industrial waste valorization with superior structural performance. Future applications could advance sustainable material engineering practices in both civil and environmental infrastructure sectors.
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References
Abbasi Zargaleh, M. R., Mazloom, M., Samimi, M. J., & Ramesht, M. H. (2025). The effect of replacing fly ash with GGBFS on the fracture parameters of geopolymer concrete. Materials Letters, 390, 138394. https://doi.org/10.1016/j.matlet.2025.138394
Adebayo, I. W., Long, G., Tang, Z., Ghone, M. O., Zaland, S., Garba, M. J., Yang, K., Akhunzada, K., & Oluwasina, U. A. (2024). Effect of crumb rubber and polyethylene fiber on the strength and toughness of fly ash/slag-based geopolymer concrete. Construction and Building Materials, 455, 139133. https://doi.org/10.1016/j.conbuildmat.2024.139133
Ah?skal?, A., Ah?skal?, M., Bayraktar, O. Y., Kaplan, G., & Assaad, J. (2024). Mechanical and durability properties of polymer fiber reinforced one-part foam geopolymer concrete: A sustainable strategy for the recycling of waste steel slag aggregate and fly ash. Construction and Building Materials, 440, 137492. https://doi.org/10.1016/j.conbuildmat.2024.137492
Ali, S., Sheikh, M. N., & Hadi, M. N. S. (2024). Effect of Glass Fibre on Slag-Fly Ash based Geopolymer Concrete. SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures, 64, 1394–1401. https://doi.org/10.1016/j.prostr.2024.09.379
Amin, F., Abbas, S., Nehdi, M. L., & Baig, Z. (2025). Performance assessment of fly ash-based geopolymer concrete pipes and its comparison with cement reinforced concrete pipes. Progress in Engineering Science, 2(3), 100122. https://doi.org/10.1016/j.pes.2025.100122
Araújo, L. B. R., de Souza, M. L., Melo, A. R. S., Costa, H. N., Babadopulos, L. F. A. L., Cabral, A. E. B., & Pileggi, R. G. (2025). High-strength self-compacting alkali-activated concrete produced with fly ash and steel slag: Rheological behavior and mixing rheology comparisons with a Portland cement concrete. CEMENT, 22, 100156. https://doi.org/10.1016/j.cement.2025.100156
Bao, W., Yin, Y., Mi, W., Chen, R., & Lin, X. (2024). Assessing performance, economic costs and environmental benefits of high-performance ecological geopolymer concrete incorporating excavated rock and soil from tunnelling, fly ash and slag as reclaimed raw materials. Journal of Building Engineering, 95, 110351. https://doi.org/10.1016/j.jobe.2024.110351
Bayraktar, O. Y., Özel, H. B., Benli, A., Y?lmazo?lu, M. U., Türkel, ?., Dal, B. B., ?evik, H., & Kaplan, G. (2024). Sustainable foam concrete development: Enhancing durability and performance through pine cone powder and fly ash incorporation in alkali-activated geopolymers. Construction and Building Materials, 457, 139422. https://doi.org/10.1016/j.conbuildmat.2024.139422
Bypour, M., Yekrangnia, M., & Kioumarsi, M. (2025). Machine learning-driven optimization for predicting compressive strength in fly ash geopolymer concrete. Cleaner Engineering and Technology, 25, 100899. https://doi.org/10.1016/j.clet.2025.100899
Chen, J., Duan, J., Zhu, Q., Jin, W., Lu, C., Lv, M., Li, W., Li, Y., & Lv, Y. (2025). High temperature resistance of slag/fly ash-based geopolymer concrete with fully recycled coarse aggregate. Construction and Building Materials, 482, 141587. https://doi.org/10.1016/j.conbuildmat.2025.141587
Elhag, A. B., Selmi, A., Ahmad, Z., & Ghazouani, N. (2025). Enhancing mechanical properties and microstructural integrity of silica fume-based self-compacting geopolymer concrete through municipal solid waste incineration fly ash incorporation. Materials Letters, 392, 138541. https://doi.org/10.1016/j.matlet.2025.138541
Emarah, D. A. (2025). Multivariate predictive modeling of compressive strength in ground granulated blast furnace slag/fly ash-based alkali-activated concrete. Cleaner Engineering and Technology, 27, 101021. https://doi.org/10.1016/j.clet.2025.101021
Fang, M., Wang, D., Shi, C., Wang, S., Li, R., Cao, F., Song, Z., & Zhang, C. (2025). Macro- and microstructural characteristics and thermal conduction mechanism of fly ash-slag-based lightweight foam concrete in cold regions. Construction and Building Materials, 492, 143019. https://doi.org/10.1016/j.conbuildmat.2025.143019
Faraji, M. F., Ah?skal?, A., Bayraktar, O. Y., Ah?skal?, M., Kaplan, G., Ayd?n, A. C., & Ozbakkaloglu, T. (2025). A green approach to construction: Fly ash-based one-part geopolymer foam concrete reinforced with waste concrete powder and polypropylene fibers. Construction and Building Materials, 494, 143429. https://doi.org/10.1016/j.conbuildmat.2025.143429
Ferreira, A. P., Natal, A. P. S., Oliveira, I., Bezerra, A. J. B., Baldo, A. P., Silva, A. S., de Tuesta, J. L. D., Peres, J. A., Ferreira, D. M., & Gomes, H. T. (2025). A comprehensive mechanical and physico-chemical characterization of fly ash-based geopolymers. Results in Engineering, 28, 108150. https://doi.org/10.1016/j.rineng.2025.108150
Ghafoor, M. T., Ali, S., Imran, M., & Saeed, M. (2025). Impact of sodium hydroxide molarity on mechanical properties of fly ash–slag-based geopolymer concrete. Proceedings of the Institution of Civil Engineers - Structures and Buildings, 178(4), 402–411. https://doi.org/10.1680/jstbu.24.00169
Gopalakrishna, B., & Dinakar, P. (2024). An innovative approach to fly ash-based geopolymer concrete mix design: Utilizing 100 % recycled aggregates. Structures, 66, 106819. https://doi.org/10.1016/j.istruc.2024.106819
Hu, H., Jiang, M., Tang, M., Liang, H., Cui, H., Liu, C., Ji, C., Wang, Y., Jian, S., Wei, C., & Song, S. (2025). Prediction of compressive strength of fly ash-based geopolymers concrete based on machine learning. Results in Engineering, 27, 106492. https://doi.org/10.1016/j.rineng.2025.106492
Karaaslan, C. (2025). Unary, binary and ternary use of slag, nano-CaCO3, and cement to enhance freeze-thaw durability in fly ash-based geopolymer concretes. Journal of Building Engineering, 99, 111631. https://doi.org/10.1016/j.jobe.2024.111631
Karthik, S., Saravana Raja Mohan, K., Murali, G., Abid, S. R., & Dixit, S. (2024). Impact of various fibers on mode I, III and I/III fracture toughness in slag, fly Ash, and silica fume-based geopolymer concrete using edge-notched disc bend specimen. Theoretical and Applied Fracture Mechanics, 134, 104751. https://doi.org/10.1016/j.tafmec.2024.104751
Kong, X., Zhang, M., Kai, M., Zhao, Y., Ren, J., & Gu, Z. (2025). Optimization of Fly ash-slag based geopolymer strength, cost, and carbon emissions using CNN-based RSM and NSGA-III. Construction and Building Materials, 501, 144380. https://doi.org/10.1016/j.conbuildmat.2025.144380
Magotra, S., & Jee, A. A. (2024). A Review on durability and microstructure of Fly-Ash based geopolymer concrete (FA-GPC). Materials Today: Proceedings. https://doi.org/10.1016/j.matpr.2024.06.011
Maradani, L. S. R., & Pradhan, B. (2024). Effect of chloride and sulphate on ionic concentration of aqueous pore solution and microstructural properties of fly ash-GBFS geopolymer concrete. Construction and Building Materials, 440, 137422. https://doi.org/10.1016/j.conbuildmat.2024.137422
Min, W., Jin, W., He, X., Wu, R., Chen, K., Chen, J., & Xia, J. (2024). Experimental study on the flexural fatigue performance of slag/fly ash geopolymer concrete reinforced with modified basalt and PVA hybrid fibers. Journal of Building Engineering, 94, 109917. https://doi.org/10.1016/j.jobe.2024.109917
Raj P K, A., Joshi, R., D, S., Nagarajan, P., & Thomas, B. S. (2025). Enhancing elevated temperature performance of alkali activated slag-dolomite concrete with Fly ash. Physics and Chemistry of the Earth, Parts A/B/C, 138, 103857. https://doi.org/10.1016/j.pce.2025.103857
Rawat, R., & Pasla, D. (2024). Evaluating the corrosion resistance and LCA of lightweight geopolymer concrete integrating sintered fly ash aggregate as coarse aggregate. Construction and Building Materials, 449, 138370. https://doi.org/10.1016/j.conbuildmat.2024.138370
Rawat, R., & Pasla, D. (2025). Corrosion performance and sustainability of high-strength lightweight geopolymer concrete incorporating sintered fly ash aggregate as the coarse aggregate. Case Studies in Construction Materials, 23, e05379. https://doi.org/10.1016/j.cscm.2025.e05379
Rihan, M. A. M., Onchiri, R. O., Gathimba, N., & Sabuni, B. (2024). Assessing the durability performance of geopolymer concrete utilizing fly ash and sugarcane bagasse ash as sustainable binders. Open Ceramics, 20, 100687. https://doi.org/10.1016/j.oceram.2024.100687
Rihan, M. A. M., Onchiri, R. O., Gathimba, N., Sabuni, B., & Pratap, B. (2025). Predicting compressive strength of fly ash and sugarcane bagasse ash-based geopolymer concrete using statistical techniques. Journal of the Indian Chemical Society, 102(7), 101791. https://doi.org/10.1016/j.jics.2025.101791
Shahedan, N. F., Hadibarata, T., Al Bakri Abdullah, M. M., Jusoh, M. N. H., Rahim, S. Z. A., Isia, I., Bras, A. A., Bouaissi, A., & Juwono, F. H. (2024). Potential of fly ash geopolymer concrete as repairing and retrofitting solutions for marine infrastructure: A review. Case Studies in Construction Materials, 20, e03214. https://doi.org/10.1016/j.cscm.2024.e03214
Shamsah, M., Kalfat, R., & Subramaniam, K. V. L. (2025). Impact of low NaOH molarities on mechanical and durability properties of ambient and oven-cured fly ash geopolymer concrete. Journal of Building Engineering, 105, 112491. https://doi.org/10.1016/j.jobe.2025.112491
Shilar, F. A., Alqahtani, D. A., Shilar, M., & Khan, T. M. Y. (2025). Valorization of Agricultural and Industrial Wastes in Geopolymer Foam Concrete, A Ternary Binder Approach Using Corncob Ash, Red Mud, and Fly Ash. Case Studies in Construction Materials, e05716. https://doi.org/10.1016/j.cscm.2025.e05716
Singh, G. V. P. B., Reddy, K. C., & Subramaniam, K. V. L. (2025). Influence of aggregate and binder proportions on the microstructure and performance of fly-ash-based geopolymer concrete. Magazine of Concrete Research, 77(19), 1173–1185. https://doi.org/10.1680/jmacr.25.00059
Türkel, ?., Özkan, ?. G. M., Baltao?lu, E., Benli, A., Bayraktar, O. Y., Özel, H. B., ?evik, H., & Kaplan, G. (2025). Enhancing thermal insulation, mechanical strength, and durability of one-part fly ash-based geopolymer foam concrete using lime and mahogany sawdust. Construction and Building Materials, 491, 142656. https://doi.org/10.1016/j.conbuildmat.2025.142656
Vigneshkumar, A., Freeda Christy, C., Muthukannan, M., Maheswaran, M., Arunkumar, K., & Kanniga Devi, R. (2024). Experimental investigations on fresh and mechanical properties of fly ash and ground granulated blast furnace slag self-compacting geopolymer concrete. Materials Today: Proceedings. https://doi.org/10.1016/j.matpr.2024.01.051
Wang, J., Zhang, R., Zhang, X., Jing, G., & Aela, P. (2025). Static flexure and dynamic behavior of fly ash-steel slag-based geopolymer concrete sleeper. Construction and Building Materials, 495, 143642. https://doi.org/10.1016/j.conbuildmat.2025.143642
Wibowo, Y. N., Piscesa, B., Tajunnisa, Y., & Sutrisno, W. (2025). Investigation on the mechanical behavior of high-calcium fly ash geopolymer concrete using one-part method. Construction and Building Materials, 490, 142436. https://doi.org/10.1016/j.conbuildmat.2025.142436
Wudil, Y. S., Al-Fakih, A., Al-Osta, M. A., & Gondal, M. A. (2025). Effective carbon footprint assessment strategy in fly ash geopolymer concrete based on adaptive boosting learning techniques. Environmental Research, 266, 120570. https://doi.org/10.1016/j.envres.2024.120570
Xu, W., Niu, X., & Zhu, Y. (2024). Deformation behavior and damage evaluation of fly ash-slag based geopolymer concrete under cyclic tension. Journal of Building Engineering, 86, 108664. https://doi.org/10.1016/j.jobe.2024.108664
Yan, G., Hu, J., Chen, M., Ma, Y., Huang, H., Zhang, Z., Wei, J., Shi, C., & Yu, Q. (2025). Performance evaluation of reinforced slag-fly ash-ceramic waste powders ternary geopolymer concrete under chloride ingress environment. Construction and Building Materials, 478, 141447. https://doi.org/10.1016/j.conbuildmat.2025.141447
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Copyright (c) 2025 Edward Ngii, Dulguun Amarsaikhan, Fatima Al-Said, Khaled Al-Sharqi
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