Pereira, ClintonGupta, Rishi2026-05-192026-05-192025Pereira, C., & Gupta, R. (2025). Effect of CO2 sequestration on long-term concrete performance and durability. Journal of Building Engineering, 111, 113553. https://doi.org/10.1016/j.jobe.2025.113553https://doi.org/10.1016/j.jobe.2025.113553https://hdl.handle.net/1828/23903As global greenhouse gas emissions have increased, all industries have been exploring green and sustainable materials and technologies. Studies have shown that adding CO2 to concrete while it is mixed improves its hardened properties. This experimental approach aims to understand the impact of adding CO2 during the mixing stage on the transport properties, freeze-thaw (F-T) resistance and corrosion resistance of embedded rebars. Key parameters like water permeability, rapid chloride ion penetration, resistivity, dynamic modulus, corrosion potential and rate were measured to assess the long-term durability. For CO2 dosages ranging from 0.25 % to 1 % by weight of cement, a 50–90 % reduction in the permeability coefficient, a 25–40 % decrease in chloride ion penetration values, and a 10–20 % increase in resistivity were observed, in comparison to control. Additionally, CO2 dosages between 0.5 % and 0.75 % showed improved resistance to F-T cycles, as observed by lower mass loss, less surface scaling, and increased stiffness. Concrete slab panels subjected to alternative wetting and drying cycles at elevated temperatures and salt-free environments showed improved corrosion resistance at CO2 dosages between 0.5 % and 0.75 %. However, similar resistance could not be obtained in saline conditions, highlighting the need for supplementary protection to mitigate corrosion. This study also applies Tuutti's model to predict the service life of reinforced concrete to assess the effectiveness of CO2 sequestration.enCC BY-NCCO2 sequestrationaccelerated carbonationdynamic moduluscorrosion resistanceservice lifeFacility for Innovative Materials and Infrastructure Monitoring (FIMIM)Centre for Advanced Materials and Related Technology (CAMTEC)ArticleDepartment of Civil Engineering