基于混凝土生产全生命周期碳中和评价与控制措施
Carbon Neutrality Evaluation and Control Measures Based on the Whole Cycle of Concrete Production
摘要: 本文从混凝土生产全生命周期出发，通过确定科学合理的计算边界，建立计算模型，并对混凝土生产全周期内碳排放源进行跟踪分类，计算边界内从原材料的生产及运输到混凝土的生产及运输过程中涉及的所有碳排放量，得出水泥是混凝土中碳排放的主要来源，因此，认为降低水泥用量是混凝土企业减少碳排放的关键任务。本文采用在混凝土中大量掺加粉煤灰的技术，以减少水泥用量，从而达到降低二氧化碳排放量至低碳产品限值的要求。结论：大掺量粉煤灰的混凝土对比普通混凝土，可降低混凝土碳排放量大约24%至25%，每立方米混凝土二氧化碳可降低50千克。
Abstract: This paper starts from the full life cycle of ready-mixed concrete production. By determining scientific and reasonable calculation boundaries, establishing a calculation model, and tracking and classifying the carbon emission sources during the full life cycle of ready-mixed concrete production, all carbon emissions involved in the process from the production and transportation of raw materials to the production and transportation of concrete within the calculation boundary are calculated. It is concluded that cement is the main source of carbon emissions in concrete, and thus reducing the amount of cement used is the core task for concrete enterprises to reduce carbon emissions. In this paper, the method of adding a large amount of fly ash to concrete to reduce the amount of cement used is adopted, so that the carbon dioxide emissions meet the requirements of the low-carbon product limit. The conclusion is that for concrete with a high proportion of fly ash, the carbon emissions of concrete can be reduced by 24%~25%, exceeding 50 kg CO2/m3.