
Low-Carbon Concrete: A Comprehensive Review of Strategies for Reducing the Construction Industry’s Environmental Impact
DOI:
https://doi.org/10.30564/jbms.v7i4.12043Abstract
The transition toward low-carbon concrete (LCC) represents a critical pathway for decarbonizing the construction sector and achieving global net-zero targets. This study provides a comprehensive and analytical review of material innovations, digital enablers, and policy mechanisms shaping the evolution of LCC technologies. A systematic PRISMA-based review combined with bibliometric mapping (VOS viewer) was conducted across various peer-reviewed studies. The analysis integrates scientific, economic, and regulatory dimensions through an original conceptual framework linking supplementary cementitious materials (SCMs), limestone calcined clay cement (LC3), geopolymers, recycled aggregates (RA), and carbon capture and utilization (CCU) with digitalization, circular economy, and life-cycle assessment. Comparative synthesis reveals that embodied-carbon reduction follows the hierarchy: Geopolymers (40–70%) > LC³ (30–40%) > SCM blends (25–40%) > CCU concretes (20–40%) > RA concretes (15–20%). However, economic feasibility declines with increasing binder novelty, underscoring the need for policy and carbon-pricing support. A time-bound roadmap toward Net-Zero 2050 is proposed, outlining near-, short-, medium-, and long-term milestones for R&D, standardization, infrastructure decarbonization, and technological breakthroughs. The paper concludes with prioritized research directions addressing standardization gaps, digital interoperability, and field-based durability validation. Collectively, the study advances an integrated vision where material innovation, digital intelligence, and policy alignment converge to accelerate the realization of a carbon-neutral concrete industry.
Keywords:
Green Certifications; Low-Carbon Concrete; Environmentally Friendly; Construction MaterialsReferences
[1] Thomas, M., Mehta, P.K., 2019. Supplementary Cementing Materials in Concrete, 3rd ed. CRC Press: Boca Raton, FL, USA.
[2] Poloju, K.K., Srinivasu, K., 2022. Influence of GGBS and Concentration of Sodium Hydroxide on Strength Behavior of Geopolymer Mortar. Materials Today: Proceedings. 65, 702–706. DOI: https://doi.org/10.1016/j.matpr.2022.03.276
[3] Intergovernmental Panel on Climate Change (IPCC), 2023. Climate Change 2023: Sixth Assessment Report (AR6). IPC: Geneva, Switzerland. Available from: https://www.ipcc.ch/assessment-report/ar6/
[4] International Energy Agency (IEA), 2024. Breakthrough Agenda Report 2024. IEA: Paris, France. Available from: https://www.iea.org/reports/breakthrough-agenda-report-2024/cement
[5] Global Cement and Concrete Association (GCCA), 2023. The GCCA 2050 Cement and Concrete Industry Roadmap for Net Zero Concrete. GCCA: London, UK. Available from: https://gccassociation.org/concretefuture/
[6] Habert, G., Miller, S.A., John, V.M., et al., 2020. Environmental Impacts and Decarbonization Strategies in the Cement and Concrete Industries. Nature Reviews Earth & Environment. 1(11), 559–573. DOI: https://doi.org/10.1038/s43017-020-0093-3
[7] van Eck, N.J., Waltman, L., 2010. Software Survey: VOSviewer, a Computer Program for Bibliometric Mapping. Scientometrics. 84(2), 523–538. DOI: https://doi.org/10.1007/s11192-009-0146-3
[8] Poloju, K.K., Annadurai, S., Manchiryal, R.K., et al., 2023. Analysis of Rheological Characteristic Studies of Fly-Ash-Based Geopolymer Concrete. Buildings. 13(3), 811. DOI: https://doi.org/10.3390/buildings13030811
[9] Kępniak, M., Chyliński, F., Woyciechowski, P., 2025. Enhancing the Performance of Recycled Aggregate Concrete Through Optimized Pretreatment Methods: A Microstructural Perspective. Scientific Reports. 15(1), 29998. DOI: https://doi.org/10.1038/s41598-025-14834-y
[10] Roknuzzaman, M., Rahman, M., Islam, M., 2025. Performance and Usability Assessment of Recycled Aggregate Extracted from Demolished Concrete Subjected to Multiple Recycling. Journal of Rehabilitation in Civil Engineering. 13(4). DOI: https://doi.org/10.22075/jrce.2025.35008.2158
[11] Roknuzzaman, M., Rahman, M., 2024. Compressive Strength of Recycled Green Concrete Affected by Chloride and Sulfate Exposures. Journal of Rehabilitation in Civil Engineering. 12(4). DOI: https://doi.org/10.22075/jrce.2024.32378.1938
[12] Nadi, S.,Nezhad, H.B., Sadeghi, A., 2022. Experimental Study on the Durability and Mechanical Properties of Concrete with Crumb Rubber. Journal of Building Pathology and Rehabilitation. 7(1), 17. DOI: https://doi.org/10.1007/s41024-021-00156-9
[13] Poloju, K.K., Yahia, H.A.M., Anil, V., 2018. Examine Possible Outcomes on Strength Properties for Utilizing Rubber Waste on Varying Grades of Concrete. Journal of Advanced Research in Dynamical and Control Systems, 10(8), 1–7. Available from: https://www.researchgate.net/publication/330243664_Examine_Possible_Outcomes_on_Strength_Properties_for_Utilizing_Rubber_Waste_on_Various_Grade_of_Concrete
[14] Et-Tanteny, R., Manssouri, I., Bouayad, A., et al., 2025. Physicochemical and Thermomechanical Performance of Eco-Friendly Unfired Clay-Biopolymer Composite Bricks. Journal of Building Material Science. 7(3). DOI: https://doi.org/10.30564/jbms.v7i3.7994
[15] Nejati, M.Y., Behruyan, M., Sadeghi, A., et al., 2025. Experimental Study on the Compressive and Flexural Properties of the Ultrahigh-Performance Concrete Containing Fibers. Journal of Building Material Science. 7(1), 83–96. DOI: https://doi.org/10.30564/jbms.v7i1.8269
[16] Garces, J.I.T., Dollente, I.J., Beltran, A.B., et al., 2021. Life Cycle Assessment of Self-Healing Geopolymer Concrete. Cleaner Engineering and Technology. 4, 100147. DOI: https://doi.org/10.1016/j.clet.2021.100147
[17] Vijayan, D.S., Gopalaswamy, S., Sivasuriyan, A., et al., 2024. Advances and Applications of Carbon Capture, Utilization, and Storage in Civil Engineering: A Comprehensive Review. Energies. 17(23), 6046. DOI: https://doi.org/10.3390/en17236046
[18] Spaeth, V., Tegguer, A.D., 2013. Improvement of Recycled Concrete Aggregate Properties by Polymer Treatments. International Journal of Sustainable Built Environment. 2(2), 143–152. DOI: https://doi.org/10.1016/j.ijsbe.2014.03.003
[19] Limbachiya, M.C., Leelawat, T., Dhir, R.K., 2000. Use of Recycled Concrete Aggregate in High-Strength Concrete. Materials and Structures. 33(9), 574–580. DOI: https://doi.org/10.1007/BF02480538
[20] Katz, A., 2003. Properties of Concrete Made with Recycled Aggregate from Partially Hydrated Old Concrete. Cement and Concrete Research. 33(5), 703–711. DOI: https://doi.org/10.1016/S0008-8846(02)01033-5
[21] Pacheco-Torgal, F., Jalali, S., 2010. Reusing Ceramic Wastes in Concrete. Construction and Building Materials. 24(5), 832–838. DOI: https://doi.org/10.1016/j.conbuildmat.2009.10.023
[22] Li, W., Xiao, J., Sun, Z., et al., 2012. Interfacial Transition Zones in Recycled Aggregate Concrete with Different Mixing Approaches. Construction and Building Materials. 35, 1045–1055. DOI: https://doi.org/10.1016/j.conbuildmat.2012.06.022
[23] Xiao, J., Li, W., Fan, Y., et al., 2012. An Overview of Study on Recycled Aggregate Concrete in China (1996–2011). Construction and Building Materials. 31, 364–383. DOI: https://doi.org/10.1016/j.conbuildmat.2011.12.074
[24] Shi, C., Li, Y., Zhang, J., et al., 2016. Performance Enhancement of Recycled Concrete Aggregate – A Review. Journal of Cleaner Production. 112, 466–472. DOI: https://doi.org/10.1016/j.jclepro.2015.08.057
[25] Junior, G.A.F., Leite, J.C.T., Mendez, G.D.P., et al., 2025. A Review of the Characteristics of Recycled Aggregates and the Mechanical Properties of Concrete Produced by Replacing Natural Coarse Aggregates with Recycled Ones—Fostering Resilient and Sustainable Infrastructures. Infrastructures. 10(8), 213. DOI: https://doi.org/10.3390/infrastructures10080213
[26] Kou, S.-C., Poon, C.-S., 2013. Long-Term Mechanical and Durability Properties of Recycled Aggregate Concrete Prepared with the Incorporation of Fly Ash. Cement and Concrete Composites. 37, 12–19. DOI: https://doi.org/10.1016/j.cemconcomp.2012.12.011
[27] Silva, R.V., de Brito, J., Dhir, R.K., 2014. Properties and Composition of Recycled Aggregates from Construction and Demolition Waste Suitable for Concrete Production. Construction and Building Materials. 65, 201–217. DOI: https://doi.org/10.1016/j.conbuildmat.2014.04.117
[28] Evangelista, L., de Brito, J., 2007. Mechanical Behaviour of Concrete Made with Fine Recycled Concrete Aggregates. Cement and Concrete Composites. 29(5), 397–401. DOI: https://doi.org/10.1016/j.cemconcomp.2006.12.004
[29] Etxeberria, M., Vázquez, E., Marí, A., et al., 2007. Influence of Amount of Recycled Coarse Aggregates and Production Process on Properties of Recycled Aggregate Concrete. Cement and Concrete Research. 37(5), 735–742. DOI: https://doi.org/10.1016/j.cemconres.2007.02.002
[30] Poloju, K.K., Shill, A., Al Balushi, A.R.S., et al., 2020. Determination of the Strength Properties of Concrete with Marble Powder. International Journal of Advanced Science and Technology. 29(08), 4004–4008.
[31] Padmini, A.K., Ramamurthy, K., Mathews, M.S., 2009. Influence of Parent Concrete on the Properties of Recycled Aggregate Concrete. Construction and Building Materials. 23(2), 829–836. DOI: https://doi.org/10.1016/j.conbuildmat.2008.03.006
[32] Kisku, N., Joshi, H., Ansari, M., et al., 2017. A Critical Review and Assessment for Usage of Recycled Aggregate as Sustainable Construction Material. Construction and Building Materials. 131, 721–740. DOI: https://doi.org/10.1016/j.conbuildmat.2016.11.029
[33] Tam, V.W.Y., Soomro, M., Evangelista, A.C.J., 2018. A Review of Recycled Aggregate in Concrete Applications (2000–2017). Construction and Building Materials. 172, 272–292. DOI: https://doi.org/10.1016/j.conbuildmat.2018.03.240
[34] Poon, C.S., Kou, S.C., Lam, L., 2002. Use of Recycled Aggregates in Molded Concrete Bricks and Blocks. Construction and Building Materials. 16(5), 281–289. DOI: https://doi.org/10.1016/S0950-0618(02)00019-3
[35] Safiuddin, Md., Alengaram, U.J., Rahman, Md.M., et al., 2013. Use of Recycled Concrete Aggregate in Concrete: A Review. Journal of Civil Engineering and Management. 19(6), 796–810. DOI: https://doi.org/10.3846/13923730.2013.799093
[36] Xiao, J., Qiang, C., Nanni, A., et al., 2017. Use of Sea-Sand and Seawater in Concrete Construction: Current Status and Future Opportunities. Construction and Building Materials. 155, 1101–1111. DOI: https://doi.org/10.1016/j.conbuildmat.2017.08.130
[37] Alibeigibeni, A., Stochino, F., Zucca, M., et al., 2025. Enhancing Concrete Sustainability: A Critical Review of the Performance of Recycled Concrete Aggregates (RCAs) in Structural Concrete. Buildings. 15(8), 1361. DOI: https://doi.org/10.3390/buildings15081361
[38] Pacheco-Torgal, F., Jalali, S., Fucic, A., 2013. Eco-Efficient Construction and Building Materials: Life Cycle Assessment (LCA), Eco-Labelling, and Case Studies. Woodhead Publishing: Cambridge, UK.
[39] Scrivener, K.L., John, V.M., Gartner, E.M., 2018. Eco-Efficient Cements: Potential Economically Viable Solutions for a Low-CO2 Cement-Based Materials Industry. Cement and Concrete Research. 114, 2–26. DOI: https://doi.org/10.1016/j.cemconres.2018.03.015
[40] Habert, G., d’Espinose de Lacaillerie, J.B., Roussel, N., 2011. An Environmental Evaluation of Geopolymer Based Concrete Production: Reviewing Current Research Trends. Journal of Cleaner Production. 19(11), 1229–1238. DOI: https://doi.org/10.1016/j.jclepro.2011.03.012
[41] Davidovits, J., 2015. Geopolymer Chemistry and Applications, 4th ed. Institut Géopolymère: Saint-Quentin, France.
[42] Bernal, S.A., Provis, J.L., 2014. Durability of Alkali‐Activated Materials: Progress and Perspectives. Journal of the American Ceramic Society. 97(4), 997–1008. DOI: https://doi.org/10.1111/jace.12831
[43] Provis, J.L., van Deventer, J.S.J., 2014. Alkali Activated Materials: State-of-the-Art Report, RILEM TC 224-AAM, RILEM State-of-the-Art Reports. Springer: Dordrecht, Netherlands. DOI: https://doi.org/10.1007/978-94-007-7672-2
[44] Turner, L.K., Collins, F.G., 2013. Carbon Dioxide Equivalent (CO2-E) Emissions: A Comparison Between Geopolymer and OPC Cement Concrete. Construction and Building Materials. 43, 125–130. DOI: https://doi.org/10.1016/j.conbuildmat.2013.01.023
[45] Poloju, K.K., Al Banna, W.N., 2024. Microstructure Studies and Strength Determination of Different Binder Content of Geopolymer Concrete. In Advancements in Science and Technology for Healthcare, Agriculture, and Environmental Sustainability. CRC Press: London, UK. pp. 50–55. DOI: https://doi.org/10.1201/9781032708348-10
[46] Hardjito, D., Wallah, S.E., Sumajouw, D.M.J., et al., 2004. In the Development of Fly Ash-Based Geopolymer Concrete. ACI Materials Journal. 101(6), 467–472.
[47] Duxson, P., Fernández-Jiménez, A., Provis, J.L., et al., 2007. Geopolymer Technology: The Current State of the Art. Journal of Materials Science. 42(9), 2917–2933. DOI: https://doi.org/10.1007/s10853-006-0637-z
[48] Nath, P., Sarker, P., 2011. Effect of Fly Ash on the Durability Properties of High Strength Concrete. Procedia Engineering. 14, 1149–1156. DOI: https://doi.org/10.1016/j.proeng.2011.07.144
[49] Chindaprasirt, P., Jaturapitakkul, C., Sinsiri, T., 2005. Effect of Fly Ash Fineness on Compressive Strength and Pore Size of Blended Cement Paste. Cement and Concrete Composites. 27(4), 425–428. DOI: https://doi.org/10.1016/j.cemconcomp.2004.07.003
[50] Shaikh, F.U.A., 2016. Mechanical and Durability Properties of Fly Ash Geopolymer Concrete Containing Recycled Coarse Aggregates. International Journal of Sustainable Built Environment. 5(2), 277–287. DOI: https://doi.org/10.1016/j.ijsbe.2016.05.009
[51] Collins, F., Sanjayan, J.G., 2001. Microcracking and Strength Development of Alkali Activated Slag Concrete. Cement and Concrete Composites. 23(4–5), 345–352. DOI: https://doi.org/10.1016/S0958-9465(01)00003-8
[52] Provis, J.L., 2018. Alkali-Activated Materials. Cement and Concrete Research. 114, 40–48. DOI: https://doi.org/10.1016/j.cemconres.2017.02.009
[53] Raza, A., Salmi, A., El Ouni, M.H., et al., 2024. A Comprehensive Review on Material Characterization and Thermal Properties of Geopolymers: Potential of Various Fibers. Case Studies in Construction Materials. 21, e03519. DOI: https://doi.org/10.1016/j.cscm.2024.e03519
[54] Zhang, M., Guo, H., El-Korchi, T., et al., 2013. Experimental Feasibility Study of Geopolymer as the Next-Generation Soil Stabilizer. Construction and Building Materials. 47, 1468–1478. DOI: https://doi.org/10.1016/j.conbuildmat.2013.06.017
[55] Rangan, B.V., 2008. Mixture Design and Production of Fly Ash-Based Geopolymer Concrete. Indian Concrete Journal. 82(5), 7–15.
[56] Singh, B., Ishwarya, G., Gupta, M., et al., 2015. Geopolymer Concrete: A Review of Some Recent Developments. Construction and Building Materials. 85, 78–90. DOI: https://doi.org/10.1016/j.conbuildmat.2015.03.036
[57] Luhar, S., Chaudhary, S., Luhar, I., 2018. Thermal Resistance of Fly Ash Based Rubberized Geopolymer Concrete. Journal of Building Engineering. 19, 420–428. DOI: https://doi.org/10.1016/j.jobe.2018.05.025
[58] Fernández-Jiménez, A., Palomo, A., 2005. Composition and Microstructure of Alkali Activated Fly Ash Binder: Effect of the Activator. Cement and Concrete Research. 35(10), 1984–1992. DOI: https://doi.org/10.1016/j.cemconres.2005.03.003
[59] Palomo, A., Krivenko, P., Garcia-Lodeiro, I., et al., 2014. A Review on Alkaline Activation: New Analytical Perspectives. Materiales de Construcción. 64(315), e022. DOI: https://doi.org/10.3989/mc.2014.00314
[60] Collins, F.G., Sanjayan, J.G., 1999. Workability and Mechanical Properties of Alkali Activated Slag Concrete. Cement and Concrete Research. 29(3), 455–458. DOI: https://doi.org/10.1016/S0008-8846(98)00236-1
[61] Chindaprasirt, P., Jaturapitakkul, C., Chalee, W., et al., 2009. Comparative Study on the Characteristics of Fly Ash and Bottom Ash Geopolymers. Waste Management. 29(2), 539–543. DOI: https://doi.org/10.1016/j.wasman.2008.06.023
[62] Deb, P.S., Nath, P., Sarker, P.K., 2014. The Effects of Ground Granulated Blast-Furnace Slag Blending with Fly Ash and Activator Content on the Workability and Strength Properties of Geopolymer Concrete Cured at Ambient Temperature. Materials & Design (1980–2015). 62, 32–39. DOI: https://doi.org/10.1016/j.matdes.2014.05.001
[63] Shi, C., Jiménez, A.F., Palomo, A., 2011. New Cements for the 21st Century: The Pursuit of an Alternative to Portland Cement. Cement and Concrete Research. 41(7), 750–763. DOI: https://doi.org/10.1016/j.cemconres.2011.03.016
[64] van Deventer, J.S.J., Provis, J.L., Duxson, P., et al., 2010. Chemical Research and Climate Change as Drivers in the Commercial Adoption of Alkali Activated Materials. Waste and Biomass Valorization. 1(1), 145–155. DOI: https://doi.org/10.1007/s12649-010-9015-9
[65] Gartner, E., Hirao, H., 2015. A Review of Alternative Approaches to the Reduction of CO2 Emissions Associated with the Manufacture of the Binder Phase in Concrete. Cement and Concrete Research. 78, 126–142. DOI: https://doi.org/10.1016/j.cemconres.2015.04.012
[66] Poloju, K.K., Al Ajmi, Z., Annadurai, S., et al., 2025. Experimental Study on Acid Resistance of Geopolymer Concrete Incorporating Fly Ash and GGBS: Towards Low-Carbon and Sustainable Construction. Buildings. 15(21), 4012. DOI: https://doi.org/10.3390/buildings15214012
[67] Page, M.J., McKenzie, J.E., Bossuyt, P.M., et al., 2021. The PRISMA 2020 Statement: An Updated Guideline for Reporting Systematic Reviews. The British Medical Journal. n71. DOI: https://doi.org/10.1136/bmj.n71
[68] Miller, S.A., Horvath, A., Monteiro, P.J.M., 2018. Impacts of Booming Concrete Production on Water Resources Worldwide. Nature Sustainability. 1(1), 69–76. DOI: https://doi.org/10.1038/s41893-017-0009-5
[69] Lehne, J., Preston, F., 2018. Making Concrete Change: Innovation in Low-carbon Cement and Concrete. Chatham House: London, UK. Available from: https://www.chathamhouse.org/2018/06/making-concrete-change-innovation-low-carbon-cement-and-concrete
[70] Shi, C., Qian, J., 2000. High Performance Cementing Materials from Industrial Slags — a Review. Resources, Conservation and Recycling. 29(3), 195–207. DOI: https://doi.org/10.1016/S0921-3449(99)00060-9
[71] Myers, R.J., Bernal, S.A., Provis, J.L., 2014. A Thermodynamic Model for C-(N-)A-S-H Gel: CNASH_ss. Derivation and Validation. Cement and Concrete Research. 66, 27–47. DOI: https://doi.org/10.1016/j.cemconres.2014.07.005
[72] Juenger, M.C.G., Snellings, R., Bernal, S.A., 2019. Supplementary Cementitious Materials: New Sources, Characterization, and Performance Insights. Cement and Concrete Research. 122, 257–273. DOI: https://doi.org/10.1016/j.cemconres.2019.05.008
[73] Fu, L., Ren, Z., Si, W., et al., 2022. Research Progress on CO2 Capture and Utilization Technology. Journal of CO2 Utilization. 66, 102260. DOI: https://doi.org/10.1016/j.jcou.2022.102260
[74] Unluer, C., Al-Tabbaa, A., 2013. Impact of Hydrated Magnesium Carbonate Additives on the Carbonation of Reactive MgO Cements. Cement and Concrete Research. 54, 87–97. DOI: https://doi.org/10.1016/j.cemconres.2013.08.009
[75] Ahmed, O., Ahmad, S., Adekunle, S.K., 2024. Carbon Dioxide Sequestration in Cementitious Materials: A Review of Techniques, Material Performance, and Environmental Impact. Journal of CO2 Utilization. 83, 102812. DOI: https://doi.org/10.1016/j.jcou.2024.102812
[76] Prayogo, D., Cheng, M.-Y., Wibowo, D., 2012. Artificial Intelligence Approaches for Optimizing High-Performance Concrete Mix Design. Available from: https://www.researchgate.net/publication/236856203_Artificial_Intelligence_Approaches_for_Optimizing_High-Performance_Concrete_Mix_Design (cited 1 June 2024).
[77] Yu, R., Spiesz, P., Brouwers, H.J.H., 2014. Mix Design and Properties Assessment of Ultra-High Performance Fibre Reinforced Concrete (UHPFRC). Cement and Concrete Research. 56, 29–39. DOI: https://doi.org/10.1016/j.cemconres.2013.11.002
[78] Ding, T., Xiao, J., Tam, V.W.Y., 2016. A Closed-Loop Life Cycle Assessment of Recycled Aggregate Concrete Utilization in China. Waste Management. 56, 367–375. DOI: https://doi.org/10.1016/j.wasman.2016.05.031
[79] Colangelo, F., Forcina, A., Farina, I., et al., 2018. Life Cycle Assessment (LCA) of Different Kinds of Concrete Containing Waste for Sustainable Construction. Buildings. 8(5), 70. DOI: https://doi.org/10.3390/buildings8050070
[80] Duxson, P., Provis, J.L., 2008. Designing Precursors for Geopolymer Cements. Journal of the American Ceramic Society. 91(12), 3864–3869. DOI: https://doi.org/10.1111/j.1551-2916.2008.02787.x
[81] van den Heede, P., de Belie, N., 2012. Environmental Impact and Life Cycle Assessment (LCA) of Traditional and ‘Green’ Concretes: Literature Review and Theoretical Calculations. Cement and Concrete Composites. 34(4), 431–442. DOI: https://doi.org/10.1016/j.cemconcomp.2012.01.004
[82] Chen, C., Habert, G., Bouzidi, Y., et al., 2010. Environmental Impact of Cement Production: Detail of the Different Processes and Cement Plant Variability Evaluation. Journal of Cleaner Production. 18(5), 478–485. DOI: https://doi.org/10.1016/j.jclepro.2009.12.014
[83] Neville, A.M., 2011. Properties of Concrete, 5th ed. Pearson Education: Harlow, UK.
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Mahria Rafi