<p>Replacing cement with industrial solid waste will reduce carbon emissions, and carbonation curing will enhance carbon sequestration capacity and improve the performance of cement-based materials. In this study, a ternary binder composed of cement, calcium carbide slag (CCS), and sintered red mud (SRM) was used to prepare mortar, and the performance difference between the mortar under carbonation curing and standard curing was compared by adjusting the ratio of the ternary binder. Results show that carbonation curing significantly boosts mortar compressive strength, carbon dioxide (CO₂) adsorption, calcium carbonate (CaCO₃) content, and carbonation degree (CD). Incorporating CCS and SRM with carbonation curing enhances CO₂ absorption and promotes hydration. After carbonation curing, compressive strength and CO₂ adsorption of cement mortar increased by 11.31% and 75.87%, respectively, compared to standard curing. The CO₂ adsorption rates for SRM and CCS mortars at 50% dosage improved by 40.28% and 55.37%, respectively, while their compressive strengths rose by 13.49% and 3.97% compared to standard curing. This study highlights that under carbonation curing conditions, adjusting the mix proportions of cement-based materials can significantly enhance carbon sequestration, contributing to the eco-friendly and sustainable development of civil engineering materials.</p> Graphical Abstract <p></p>