基于生命周期评价的UHPC碳排放控制潜力评估

摘要/Abstract

摘要： 近年来,超高性能混凝土(UHPC)得到了推广应用,但在UHPC生产过程中超量水泥消耗以及UHPC自身耐久性强、寿命长的特点,对UHPC的碳排放水平认识尚不清楚。因此,研究采用生命周期评价(LCA)方法构建了UHPC碳排放定量分析模型,对比分析钢-UHPC桥面板与常规钢-混桥面板结构在全生命周期内的碳排放。结果表明:虽然生产阶段UHPC的碳排放量约1 245.84 kg CO₂eq/m³,是普通混凝土的1.58倍,但从性能上来说,UHPC碳强度是普通混凝土的62.25%,是一种更绿色的建材;在整个生命周期内,与常规钢-混桥面板相比,钢-UHPC桥面板的年均碳排放量下降了35.76%,具有巨大的碳减排潜力,有助于基础设施的可持续性发展;钢-UHPC桥面板方案具有工程比选优势,经济性合理,同时其单位产值碳排放为0.89 t CO₂eq/万元,是常规钢-混桥面板的86.41%,具有更好的减碳效果。研究对结果的可靠性和碳减排措施进行了讨论,最后提出了有待进一步研究的内容。

关键词: 超高性能混凝土, 钢筋混凝土, 生命周期评价, 碳排放, 成本分析, 桥面板

Abstract: In recent years, ultra-high performance concrete (UHPC) has been widely used. However, due to excessive cement consumption in the production process of UHPC, the solid durability and long life of UHPC, the level of carbon emission from UHPC is not yet well understood. Therefore, the life cycle assessment (LCA) method was used to build a quantitative UHPC emission analysis model to compare and analyze the carbon emissions in the whole life cycle between steel-UHPC bridge deck and conventional steel-concrete bridge deck structure. The results show that although the carbon emission of UHPC in the production stage is about 1 245.84 kg CO₂eq/m³, which is 1.58 times that of the ordinary concrete, in terms of performance, the carbon strength of UHPC is 62.25% of the ordinary concrete, so UHPC is a greener building material. Over the entire life cycle, the average annual carbon emissions of steel-UHPC bridge decks decrease by 35.76% than conventional steel-mixed bridge deck, offering significant carbon reduction potential and contributing to the sustainability of infrastructure development. The steel-UHPC bridge deck scheme has engineering comparison advantages and excellent economy, and its carbon emission per unit output value is 0.89 t CO₂eq/10³ yuan, which is 86.41% of that of the conventional steel-mixed bridge deck and has a better carbon reduction effect. The reliability of the results and further emission reduction measures are discussed, and finally, the contents to be further studied are put forward.

Key words: ultra-high performance concrete, reinforced concrete, life cycle assessment, carbon emission, cost analysis, bridge deck

中图分类号:

X322
F426

丁超, 贾子杰, 王振华, 丁玉贤. 基于生命周期评价的UHPC碳排放控制潜力评估[J]. 硅酸盐通报, 2023, 42(4): 1242-1251.

DING Chao, JIA Zijie, WANG Zhenhua, DING Yuxian. UHPC Carbon Emission Control Potential Based on Life Cycle Assessment[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(4): 1242-1251.

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