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CONCRETE TECHNOLOGYwww.cpi-worldwide.com CPI %u2013 Concrete Plant International %u2013 2 | 2026er-carbon concrete mixes that transform an agricultural waste stream into a value-added, potentially carbon-sequestering construction material.AcknowledgementsThe authors would like to thank CARBOLIVA, S.A. for supplying the olive pit biochar used in this study, and Ing. Jos%u00e9 Robollo for his technical and scientific support in the conceptualization of the research.nReferences[1] R. Patel, J. Stobbs, and B. Acharya, %u201cStudy of biochar in cementitious materials for developing green concrete composites,%u201d Sci Rep, vol. 15, no. 1, pp. 1%u201318, 2025, doi: 10.1038/s41598-025-07210-3.[2] R. Patel, A. Babaei-Ghazvini, M. J. Dunlop, and B. Acharya, %u201cBiomaterials-based concrete composites: A review on biochar, cellulose and lignin,%u201d Carbon Capture Science and Technology, vol. 12, no. May, p. 100232, 2024, doi: 10.1016/j.ccst.2024.100232.[3] A. R. G. de Azevedo et al., %u201cPossibilities for the application of agro-industrial wastes in cementitious materials: A brief review of the Brazilian perspective,%u201d Cleaner Materials, vol. 3, no. December 2021, p. 100040, 2022, doi: 10.1016/j.clema.2021.100040.[4] T. European and G. Deal, %u201cThe European Green Deal,%u201d 2019.[5] A. M. Mohamed, B. A. Tayeh, Y. I. Abu Aisheh, and M. N. A. Salih, %u201cUtilising olive-stone biomass ash and examining its effect on green concrete: A review paper,%u201d Journal of Materials Research and Technology, vol. 24, pp. 7091%u20137107, 2023, doi: 10.1016/j.jmrt.2023.05.039.[6] Asociaci%u00f3n Espa%u00f1ola de Normalizaci%u00f3n, %u201cUNE-EN 206. Concrete. Specification, performance, production and conformity.,%u201d 2025.[7] D. Wang, G. Sas, and O. Das, %u201cThe importance of volumetric w/c for porous supplementary cementitious materials in concrete,%u201d Journal of Building Engineering, vol. 111, no. April, p. 113290, 2025, doi: 10.1016/j.jobe.2025.113290.[8] D. Wang, A. Jantwal, E. Kaynak, G. Sas, and O. Das, %u201cPromoting internal curing in concrete by replacing sand with sustainable biochar,%u201d Case Studies in Construction Materials, vol. 22, no. March, 2025, doi: 10.1016/j.cscm.2025.e04542.[9] Asociaci%u00f3n Espa%u00f1ola de Normalizaci%u00f3n, %u201cUNE-EN 12390-2. Testing hardened concrete. Part 2: Making and curing specimens for strength tests.,%u201d Madrid, Jul. 2020.[10] Asociaci%u00f3n Espa%u00f1ola de Normalizaci%u00f3n, %u201cUNE-EN 12390-3. Testing hardened concrete. Part 3: Compressive strength of test specimens.,%u201d Madrid, 2020.[11] Asociaci%u00f3n Espa%u00f1ola de Normalizaci%u00f3n, %u201cUNE-EN 12390-6. Testing hardened concrete. Part 6: Tensile splitting. strength of test specimens,%u201d Madrid, Sep. 2024.[12] Asociaci%u00f3n Espa%u00f1ola de Normalizaci%u00f3n, %u201cUNE-EN 12390-13. Testing hardened concrete. Part 13: Determination of secant modulus of elasticity in compression,%u201d Madrid, May 2022.