Carbon uptake by cement in China:Estimation and contribution to carbon neutrality goals

作     者：Mingjing MA Zi HUANG Jiaoyue WANG Le NIU Wenfeng ZHANG Xiaowei XU Fengming XI Zhu LIU 

作者机构：Institute of Applied EcologyChinese Academy of SciencesShenyang 110016China College of Resources and EnvironmentUniversity of Chinese Academy of SciencesBeijing 100049China Department of Earth System ScienceTsinghua UniversityBeijing 100084China Department of Engineering ScienceUniversity of OxfordOxfordOX13UK 

出 版 物：《Science China Earth Sciences》 (中国科学（地球科学英文版）)

年 卷 期：2024年第67卷第6期

页      面：2056-2067页

核心收录：

学科分类：080706[工学-化工过程机械] 083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 0708[理学-地球物理学] 0807[工学-动力工程及工程热物理] 

基　　金：supported by the China Association for Science and Technology(Grant Nos.2020201&Y202050) the National Natural Science Foundation of China(Grant Nos.71874097,41921005&41977290) the International Support Program of the President of the Chinese Academy of Sciences(Grant No.2017 VCB 0004) the Beijing Natural Science Foundation(Grant No.JQ 19032) the Liaoning Xingliao Talent Project(Grant No.XLYC1907148) the Major Project of the Institute of Applied Ecology,Chinese Academy of Sciences(Grant No.IAEMP202201) 

主　　题：Cement Carbon uptake Life cycle assessment Carbon emission reduction Carbon neutrality 

摘      要：Cement is a widely used construction material *** manufacturing contributes to anthropogenic CO_(2)emissions ***,its alkaline compounds can absorb CO_(2)from the surrounding environment and engage in a carbonation reaction,thereby functioning as a carbon *** a major cement producer and consumer,China has an important responsibility to rigorously investigate and accurately account for cement carbon *** study presents a comprehensive analytical model of cement carbon uptake from China,revealing a substantial increase in carbon uptake from 1930 to 2021,peaking at 426.77 Mt CO_(2)(95% Confidence Interval:317.67-874.33 Mt CO_(2))in *** uptake accounts for 8.10% to 45.40% of China’s annual land sink and 2.51% to 4.54% of the global land *** cumulative carbon uptake by cement is approximately 7.06 Gt CO_(2)(95%CI:5.22–9.44 Gt CO_(2))during this period,offsetting 50.7% of the total emissions(13.91 Gt CO_(2),95%CI:12.44–17.00 Gt CO_(2))from the cement ***,cement mortar contributed to most absorption(65.64%).From a life cycle perspective,the service stage of cement materials is the period where the largest CO_(2)sink is formed,accounting for 90.03% of the ***,the potential for carbon sequestration in cement materials and their waste is ***,the model improves the accuracy of cement carbon accounting,supporting both China and global carbon neutrality ***,it is crucial for China to achieve its carbon neutrality goals sooner by prioritizing the environmental benefits of cement materials and wastes,and accelerating the development and commercialization of CO_(2)sequestration technologies for cement and its by-products.