| Summary: | This paper explores the use of Calcium Lime Waste (CLW) as a cementitious material for early CO2 capture. CLW, primarily composed of Calcium Hydroxide Ca(OH)2, has high CaO content, making it ideal for CO2 sequestration. CLW was added to Ordinary Portland Cement (OPC) mortar as a 0-40% replacement, and fresh and hardened properties – including workability, density, compressive strength, and CO2 capture – were analysed. The results indicated that 30% CLW replacement gave optimal performance, with high CO2 capture at targeted compressive strength for load and non-load bearing applications. This mix also achieved the greatest CaCO3 precipitation at 34.61% and maintained desired strength over time. Mercury Intrusion Porosimetry (MIP) analysis revealed a micro-filling effect, reducing pore size compared to the control. The study supports the potential of CLW as a sustainable CO2 absorbent, promoting environmental sustainability through waste reuse and CO2 sequestration in construction materials. © This is an open access article under the CC BY-NC-SA 4.0 license.
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