Carbon dioxide (CO2) is a substantial contributor to global warming owing to its long atmospheric lifetime and high potential for global warming. It is related to the processes of raw material mining and industry, whi...Carbon dioxide (CO2) is a substantial contributor to global warming owing to its long atmospheric lifetime and high potential for global warming. It is related to the processes of raw material mining and industry, which is fundamental to economic development but also has negative impacts on the environment, namely the increase of global temperature and solid waste. To address this, various carbon capture, storage, utilization, and mineralization methods have emerged, but they remain at an early stage of development. This review discusses the applicability of solid waste materials, and slurry form in particular, for CO2 mineralization. It analyzes frequently researched materials, carbonation capabilities, reaction mechanisms, and industrial uses. Industrial waste materials, cement, and demolition waste are widely used in carbonation reactions because of their abundance and high Ca/Mg oxide content. The review also discusses carbonation types, including two major types—direct and indirect—which fall under the ex-situ category. The key factors influencing the carbonation efficiency include the CO2 concentration, temperature, pressure, particle size, and reaction chamber type. The construction sector is the principal beneficiary of carbonated materials due to the cementitious characteristics of recarbonated byproducts and precipitated calcium carbonate (PCC). Other industries, such as paper, plastics, and pharmaceuticals, also find applications for PCC. Future research is recommended to explore new materials for slurry carbonation, with potential applications in underground mine support for carbon sequestration and subsidence control.展开更多
The sustainability of transportation infrastructure,particularly road construction,has emerged as a pressing global concern due to its substantial environmental and public health impacts.This study conducts a macro-le...The sustainability of transportation infrastructure,particularly road construction,has emerged as a pressing global concern due to its substantial environmental and public health impacts.This study conducts a macro-level life cycle assessment(LCA)of solid waste-based pavements utilizing steel slag and reclaimed asphalt pavement,with a specific focus on evaluating the environmental,economic,and health advantages of these alternative materials.A comprehensive LCA model was developed,integrating critical factors such as carbon emissions,PM_(2.5) reductions,and life-cycle costs.The analysis encompasses all stages of the pavement life cycle,including raw material extraction,construction,usage,and end-of-life disposal,while also incorporating the dynamic effects of pavement deterioration and vehicle fuel consumption.In this study,a more refined life cycle benefit analysis was performed by accounting for slag production capacity and road mileage across different provinces in China,providing a more detailed regional assessment.The results demonstrate that implementing solid waste-based pavements across the mainland of China could reduce CO_(2)e emissions by 45.65%(10291 million tons),PM_(2.5) emissions by 33.91%(64.33 million tons),and costs by 13.74%(218.81 billion CNY)over a 30-year period,while preventing approximately 4990 premature deaths attributable to PM_(2.5) exposure.When monetizing these health benefits and climate impacts,the study projects a total net economic benefit of 316.30 billion CNY over 30 years.This research offers a scalable framework for assessing the multidimensional benefits of solid waste-based pavements,providing crucial insights for policymakers,engineers,and industry stakeholders committed to promoting sustainable and cost-effective infrastructure solutions.展开更多
文摘Carbon dioxide (CO2) is a substantial contributor to global warming owing to its long atmospheric lifetime and high potential for global warming. It is related to the processes of raw material mining and industry, which is fundamental to economic development but also has negative impacts on the environment, namely the increase of global temperature and solid waste. To address this, various carbon capture, storage, utilization, and mineralization methods have emerged, but they remain at an early stage of development. This review discusses the applicability of solid waste materials, and slurry form in particular, for CO2 mineralization. It analyzes frequently researched materials, carbonation capabilities, reaction mechanisms, and industrial uses. Industrial waste materials, cement, and demolition waste are widely used in carbonation reactions because of their abundance and high Ca/Mg oxide content. The review also discusses carbonation types, including two major types—direct and indirect—which fall under the ex-situ category. The key factors influencing the carbonation efficiency include the CO2 concentration, temperature, pressure, particle size, and reaction chamber type. The construction sector is the principal beneficiary of carbonated materials due to the cementitious characteristics of recarbonated byproducts and precipitated calcium carbonate (PCC). Other industries, such as paper, plastics, and pharmaceuticals, also find applications for PCC. Future research is recommended to explore new materials for slurry carbonation, with potential applications in underground mine support for carbon sequestration and subsidence control.
基金supported by the National Natural Science Foundation of China(Grant No.52278445)the Carbon Peak and Carbon Neutrality Science and Technology Innovation Special Funds of Jiangsu Province(Grant No.BE2022615)+2 种基金the Major Science and Technology Project of Nanjing(Grant No.202209012)the Key Technology Research and Industrialization Application Project of Novel Low-carbon Asphalt Pavement Based on Waste Steel Slag(Grant No.H202210487)the 2024 Jiangsu Provincial Graduate Student Research and Innovation Program(Grant No.KYCX24_0459).
文摘The sustainability of transportation infrastructure,particularly road construction,has emerged as a pressing global concern due to its substantial environmental and public health impacts.This study conducts a macro-level life cycle assessment(LCA)of solid waste-based pavements utilizing steel slag and reclaimed asphalt pavement,with a specific focus on evaluating the environmental,economic,and health advantages of these alternative materials.A comprehensive LCA model was developed,integrating critical factors such as carbon emissions,PM_(2.5) reductions,and life-cycle costs.The analysis encompasses all stages of the pavement life cycle,including raw material extraction,construction,usage,and end-of-life disposal,while also incorporating the dynamic effects of pavement deterioration and vehicle fuel consumption.In this study,a more refined life cycle benefit analysis was performed by accounting for slag production capacity and road mileage across different provinces in China,providing a more detailed regional assessment.The results demonstrate that implementing solid waste-based pavements across the mainland of China could reduce CO_(2)e emissions by 45.65%(10291 million tons),PM_(2.5) emissions by 33.91%(64.33 million tons),and costs by 13.74%(218.81 billion CNY)over a 30-year period,while preventing approximately 4990 premature deaths attributable to PM_(2.5) exposure.When monetizing these health benefits and climate impacts,the study projects a total net economic benefit of 316.30 billion CNY over 30 years.This research offers a scalable framework for assessing the multidimensional benefits of solid waste-based pavements,providing crucial insights for policymakers,engineers,and industry stakeholders committed to promoting sustainable and cost-effective infrastructure solutions.
