Hydrated Lime–Enriched CO2 Sequestration Binders Reinforced by Polyvinyl Alcohol

Abstract

Carbon capture utilization and storage technique (CCUS) is an effective way to mitigate climate change. Carbon dioxide (CO2) sequestration binders (CSB) composed of hydrated lime (CH) and cement has great application prospects in CCUS. Although CH in CSB can improve the carbon absorption capacity, it causes a significant decrease in flexural strength. This study focused on the effect of polyvinyl alcohol (PVA) on the CO2 absorption capacity and flexural strength of CSB. The results show that PVA is beneficial to enhancing the flexural strength of CSB either under natural carbonation or accelerated carbonation. This enhancement is more pronounced at an early age for CSB with high CH content. Furthermore, CO2 uptake experiments show that the PVA would not reduce the CO2 absorption of CSB and even has a slight improvement effect. Finally, thermodynamic modeling and price calculation were adopted for CSB to illustrate the chemical phase and economic cost changes. The outcomes of this study shed new light on PVA to optimize CSB.