SDU Life Cycle Engineering, Department of Chemical Engineering, Biotechnology, and Environmental Technology, University of Southern Denmark, 5230, Odense, Denmark.
Institute for Materials and Processes, School of Engineering, University of Edinburgh, Edinburgh, EH9 3FB, UK.
Nat Commun. 2020 Jul 29;11(1):3777. doi: 10.1038/s41467-020-17583-w.
Cement plays a dual role in the global carbon cycle like a sponge: its massive production contributes significantly to present-day global anthropogenic CO emissions, yet its hydrated products gradually reabsorb substantial amounts of atmospheric CO (carbonation) in the future. The role of this sponge effect along the cement cycle (including production, use, and demolition) in carbon emissions mitigation, however, remains hitherto unexplored. Here, we quantify the effects of demand- and supply-side mitigation measures considering this material-energy-emissions-uptake nexus, finding that climate goals would be imperiled if the growth of cement stocks continues. Future reabsorption of CO will be significant (~30% of cumulative CO emissions from 2015 to 2100), but climate goal compliant net CO emissions reduction along the global cement cycle will require both radical technology advancements (e.g., carbon capture and storage) and widespread deployment of material efficiency measures, which go beyond those envisaged in current technology roadmaps.
水泥在全球碳循环中扮演着双重角色，就像一块海绵：其大规模的生产对当今全球人为 CO2 排放有重大贡献，但未来其水合产物将逐渐大量吸收大气 CO2（碳化作用）。然而，这种海绵效应在水泥周期（包括生产、使用和拆除）中在减排方面的作用迄今仍未得到探索。在这里，我们考虑到这种物质-能源-排放-吸收关系，量化了需求侧和供应侧缓解措施的影响，发现如果水泥库存继续增长，气候目标将受到威胁。未来 CO2 的再吸收将是巨大的（约占 2015 年至 2100 年期间 CO2 排放总量的 30%），但要实现全球水泥周期内符合气候目标的净 CO2 减排，不仅需要激进的技术进步（例如碳捕获和封存），还需要广泛部署材料效率措施，这些措施超出了当前技术路线图的设想。
