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表7国家温室气体排放因子数据库（第一版）部分温室气体排放因子

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所属报告：

中国建筑材料联合会：2025低碳混凝土发展报告（41页）.pdf

打包全文图表

按隐含碳边界核算时，原料获取阶段的碳足迹是混凝土碳足迹的主要来源，其中水泥占比超过85%，骨料占比5%左右。预拌混凝土的生产工艺流程是一个高度系统化的过程，涵盖原材料准备、精确配料、剂进行质量检测与分类储存，其中砂石需清洗至含泥量≤3%，水泥采用密闭筒仓存储以避免受潮。配料与投料通过计算机控制系统按设计配合比精准称量，砂石经皮带输送至搅拌机, 水泥、掺合料通过螺旋输送机计量，液态外加剂则由计量泵注入，全程误差控制在±1%以内。强制式搅拌阶段，搅拌机搅拌时间3~5分钟，确保浆体均匀包裹骨料，特殊混凝土（如自密实混凝土）需延长至6分钟。预拌混凝土原材料体系由水泥、骨料、矿物掺合料、外加剂及拌合用水五大关键组分构成。从各组分体积占比分析，骨料在混凝土结构中占据主导地位，约占总体积的 70%；拌合用水占比约14%，对混凝土的工作性能及凝结硬化过程起到关键作用；水泥与矿物掺合料共同构成胶凝材料体系，二者合计占比约10%，直接影响混凝土的强度与耐久性；外加剂虽仅占总体积的2%，却能显著改善混凝土的流变性能与施工特性；此外，混凝土内部孔隙中空气含量约为4%，该部分气体对混凝土的抗冻性及收缩性能具有重要影响。各组分以特定比例协同作用，共同决定预拌混凝土的物理力学性能与工程适 ■声明单位：预拌混凝土产品碳足迹量化的声明单位为“1m'某品种、某强度等级的预拌混凝土产品”，如1m"C40预拌混凝土。

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