Abstract This research explores the efficacy of dry pre-conditioning treatment coupled with accelerated CO 2 curing for mortar incorporating unreactive Calcium Lime Waste (CLW), with a specific focus on enhancing mechanical properties and CO 2 capture. The investigation was initiated by characterizing the CLW material through various microstructural examinations and toxicity tests using the Toxicity Characteristic Leaching Procedure (TCLP). Different proportions of CLW (0–40%) were blended into