摘要
预拌混凝土作为最典型的建筑材料产品之一,碳减排潜力巨大。以预拌混凝土为主要研究对象,基于相关标准,研究不同获取方式下的碳排放因子对核算结果的影响,分析不同系统边界选择的合理性,并考察相应单元过程的碳减排潜力。前后3次核算所得C30预拌混凝土的半生命周期碳排放量分别为236.01kgCO_(2)/m^(3)、258.30kgCO_(2)/m^(3)、216.55kgCO_(2)/m^(3)。研究发现,实地调研上游供应商的初级数据所得碳排放因子,更能体现建材产品碳排放的本土化、区域性及季节性特征;系统边界的选择则应考虑不同建材产品的生产应用特点,做好供应链上下游碳足迹核算的衔接。此外,原材料水泥、机制砂对预拌混凝土碳足迹的影响较大,选用低碳水泥、优化原材料配合比、减少运输过程中的碳排放是减少预拌混凝土碳排放较为直接有效的手段。
Ready-mixed concrete,as one of the most typical building material products,possesses significant potential for carbon reduction.Taking ready-mixed concrete as the primary research subject and based on relevant standards,this study examines the impact of carbon emission factors derived through different acquisition methods on calculation outcomes,analyses the rationality of selecting different system boundaries,and investigates the carbon reduction potential of corresponding unit processes.Three consecutive calculations yielded semi-lifecycle carbon emissions for C30 ready-mixed concrete of 236.01 kgCO_(2)/m^(3),258.30 kgCO_(2)/m^(3),and 216.55 kgCO_(2)/m^(3) respectively.Findings indicate that carbon emission factors derived from primary data obtained through field surveys of upstream suppliers better reflect the localised,regional,and seasonal characteristics of building material emissions.The selection of system boundaries should account for the production and application characteristics of different building materials,ensuring seamless integration of carbon footprint calculations across the supply chain.Furthermore,raw materials such as cement and manufactured sand significantly influence the carbon footprint of ready-mixed concrete.Employing low-carbon cement,optimising raw material mix proportions,and reducing carbon emissions during transportation represent direct and effective measures to mitigate carbon emissions in ready-mixed concrete.
作者
王沁星
张羽
WANG Qinxing;ZHANG Yu(Shanghai Greenment Environmental Technology Co.,Ltd.,Shanghai 200080,China)
出处
《绿色建筑》
2025年第6期81-85,91,共6页
Green Building
关键词
建材产品
预拌混凝土
产品碳足迹
节能降碳
绿色建材
building material
ready-mixed concrete
product carbon footprint
energy saving and carbon reduction
green building material
