摘要
为了给“双碳”目标下公路建设中低碳材料的合理选择提供科学依据,并为提升钢渣沥青的使用提供支撑,评估了普通沥青路面与钢渣沥青路面的全生命周期碳足迹,以确定2种路面材料的碳排放差异。涉及从原材料准备、铺筑、维护到拆除回收的整个生命周期,采用生命周期评价(life cycle assessment,LCA)方法,建立了环境影响评价模型,并收集了各阶段的能源消耗数据。基于ISO(International Organization for Standardization)生命周期评价标准,功能单位定义为长度1 km、宽度3.75 m、厚度4 cm的路面单元。使用了内部数据收集和外部LCI(leader communications incorporated)数据库,包括Ecoinvent数据库和文献调研数据。研究对象为普通沥青路面和钢渣沥青路面,涉及的主要物料消耗和能源包括石材、钢渣、炸药、电力、柴油等。通过质量分配法处理共生产品,建立了工序阶段清单模型,并计算了2种路面的碳足迹。研究结果表明,钢渣沥青路面的全生命周期碳排放比普通沥青路面低69.6%,主要差异体现在原材料准备、路面铺筑和维护阶段。钢渣沥青路面因其较长的使用寿命和较低的维护需求,在维护阶段显著降低了碳排放。此外,还分析了2种路面在不同阶段的碳排放分布以及主要物料消耗和能源的碳排放贡献,提出了未来研究方向,包括进一步优化路面工程技术、降低环境影响,以及推广低碳建设技术。研究结果为理解和降低道路建设中的环境影响提供了新视角,并为公路建设行业的碳减排提供了理论支持和技术指导。
The life-cycle carbon footprint of ordinary asphalt pavement and steel slag asphalt pavement was evalu⁃ated to quantify the differences in carbon emissions between the two materials.This evaluation provides a scientific basis for the selection of low-carbon materials in highway construction under the"dual-carbon"target and supports improved utilization of steel slag asphalt.The entire life cycle,including raw material preparation,paving,and main⁃tenance to demolition and recycling,was assessed using the life cycle assessment(LCA)methodology.An environ⁃mental impact assessment model was developed,and energy consumption data for each stage were collected.In accordance with ISO LCA standards,the functional unit was defined as a 1 km long,3.75 m wide,and 4 cm thick pavement section.Primary data collection and external LCI databases(including the Ecoinvent database and literature-derived data)were utilized.The key materials and energy sources examined included aggregates(stone,steel slag),explosives,electricity,and diesel.A process-based inventory model was established using the mass allocation method to account for co-products,and the carbon footprints of both pavement types were calculated.The results show that steel slag asphalt pavement has 69.6%lower life-cycle carbon emissions than ordinary asphalt pavement,with the most significant differences occurring in the raw material preparation,pavement construction,and maintenance phases.Due to its extended service life and reduced maintenance needs,steel slag asphalt pave⁃ment significantly decreases emissions during the maintenance stage.Furthermore,the carbon emission distribution across various life-cycle stages was analyzed,along with the relative contributions of key materials and energy sources.Future research directions were proposed,including further optimization of pavement engineering technolo⁃gies,reduction of environmental impacts,and the promotion of low-carbon construction practices.New insights into mitigating the environmental effects of road construction are provided,and theoretical and technical support for car⁃bon reduction in the highway construction industry is offered.
作者
刘颖昊
肖永力
汪水泽
上官方钦
宋中华
罗通辰
LIU Yinghao;XIAO Yongli;WANG Shuize;SHANGGUAN Fangqin;SONG Zhonghua;LUO Tongchen(Central Research Institute,Baoshan Iron and Steel Co.,Ltd.,Shanghai 201900,China;Institute for Carbon Neutrality,University of Science and Technology Beijing,Beijing 100083,China;Steel Industry Green and Intelligent Manufacturing Technology Center,China Iron and Steel Research Institute Group,Beijing 100081,China)
出处
《钢铁》
北大核心
2025年第9期204-213,共10页
Iron and Steel
关键词
沥青路面
钢渣
碳足迹
生命周期评估
公路建设
固废资源化利用
低碳材料
碳排放
asphalt pavement
steel slag
carbon footprint
life cycle assessment
highway construction
resource utilization of solid waste
low-carbon materials
carbon emission
