Durability assessment of ground granulated blast furnace slag-based CO2 sequestered concrete

The emergence of CO2 Sequestered Concrete (CSC) presents a promising avenue for mitigating net carbon dioxide (CO2) emissions in the cement–concrete industry, thereby addressing climate change. The study focuses on evaluating the durability and microstructural attributes of CSC formulations incorporating Ground Granulated Blast Furnace Slag (GGBFS) as a supplementary cementitious material. Enhanced CO2 sequestration was achieved through carbonation during mixing, curing, or both. The GGBFS-based CSC specimens, subjected to comprehensive evaluations of sequestration efficiency, mechanical performance, durability, and microstructural characteristics, demonstrated a 20% CO2 uptake, a 19.9% increase in strength attributed to microstructural refinement, and a 29.4% reduction in chloride penetration, indicative of enhanced corrosion resistance due to reduced pore connectivity. These findings underscore the viability of CSC integrated with GGBFS as a sustainable solution aligned with global initiatives aimed at achieving carbon neutrality C-CC concrete specimens exhibited the lowest chloride content at 207.2 mg/L.GGBFS-added binder was able to achieve a CO2 uptake capacity of up to 20.04%.CO2 sequestration increased Cl− ion resistance by 29.4% decrease in mobility.C-CC specimens had a non-steady state migration coefficient of 3.16 × 10−12 m2/s.The passage of charges reduced from 3516 to 1703 coulombs due to sequestration. C-CC concrete specimens exhibited the lowest chloride content at 207.2 mg/L. GGBFS-added binder was able to achieve a CO2 uptake capacity of up to 20.04%. CO2 sequestration increased Cl− ion resistance by 29.4% decrease in mobility. C-CC specimens had a non-steady state migration coefficient of 3.16 × 10−12 m2/s. The passage of charges reduced from 3516 to 1703 coulombs due to sequestration.