首页|基于全寿命周期的钢渣沥青混合料环境及经济效益分析

基于全寿命周期的钢渣沥青混合料环境及经济效益分析

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为对比分析钢渣沥青混合料环境及经济效益、推动钢渣在道路工程建设中的资源化利用,采用生命周期分析方法,基于湖南省某高速公路工程实例的活动数据和定额数据,量化钢渣沥青混合料和常规沥青混合料(AC-13C、AC-20C)的能耗及碳排放,对比分析钢渣替代不同天然集料(玄武岩和石灰岩)分别用于沥青路面上面层和中面层的环境效益.基于钢渣所含碱土矿物自发的碳酸化反应,探讨实验室条件下钢渣的固碳潜能.此外,采用效益-费用分析法比较钢渣沥青混合料和常规沥青混合料的建设成本及运营期养护成本,研究钢渣运距对工程造价的影响,提出钢渣的最大经济运距.研究结果表明:每1 000 m3钢渣沥青混合料AC-13C和AC-20C在建设期全过程的碳排放量分别为157.11、148.22 t,相较于常规沥青混合料分别降低12.20%和增加3.08%,其中钢渣沥青混合料AC-13C和AC-20C在原材料生产及运输环节的碳排放量分别为80.25、73.50 t,占建设期全过程的比例分别为51.08%和49.60%;钢渣固碳潜能巨大,每吨钢渣的理论最大固碳量为0.33~0.48 t,经济效益分析结果表明,上面层钢渣沥青混合料AC-13C建设成本和养护费用分别为每年42.0、8.8元/m2,比常规玄武岩沥青混合料每年节约了 6.8、3.6元/m2,而钢渣沥青混合料中面层AC-20C的建设成本为每年57.6元/m2,略高于常规中面层石灰岩沥青混合料的每年54.0元/m2;钢渣的运距是影响环境和经济效益的关键因素,当运距分别超过171.8、225.0 km,钢渣沥青混合料上面层在碳排放和建设成本方面的优势将消失;在实际应用中,建议将钢渣在生产地附近利用,且替代玄武岩应用于沥青路面上面层,以最大程度发挥其环境和经济效益.
Analysis on environmental and economic benefits of steel slag asphalt mixture on a life cycle basis
In order to comparatively analyze the environmental and economic benefits of steel slag asphalt mixture and promote the resource utilization of steel slag in the construction of road engineering,life cycle analysis method was used on the basis of activity data collected from an expressway engineering project in Hunan Province and quota data.The energy consumption and carbon emission were quantified respectively for steel slag asphalt mixtures and conventional asphalt mixtures AC-13C、AC-20C.The environmental benefit of steel slag replacing different natural aggregates(basalt and limestone)for the surface and intermediate layers of asphalt pavement were comparatively analyzed.The carbon fixation potential of steel slag was discussed under laboratory conditions,based on spontaneous carbonation reaction of alkaline-earth minerals in steel slag.In addition,the cost-effectiveness analysis method was applied to compare the construction and maintenance cost of steel slag asphalt mixture and conventional asphalt mixture.Then,the influence of transportation distance of steel slag on construction cost was investigated to propose the maximum economic transportation distance for steel slag.The results show that the carbon emission of 1 000 m3 steel slag asphalt mixtures AC-13C、AC-20C are 157.11 and 148.22 tonnes respectively throughout the whole construction process,which reduces 12.20%and increases 3.08%respectively compared with conventional asphalt mixture.The carbon emission of steel slag asphalt mixtures AC-13C、AC-20C are respectively 80.25 and 73.50 tonnes at the stage of production and transportation of raw material,accounting for 51.08%and 49.60%of the whole construction process.The theoretical maximum carbon fixation varies from 0.33 to 0.48 tonnes CO2 per tonne of steel slag,and thus the potential of carbon fixation is considerable.The results of economic analysis suggest that the construction cost and maintenance annual cost of the surface layer of steel slag asphalt mixture AC-13C is 42.0 and 8.8 yuan/m2 every year,which reduces 6.8 and 3.6 yuan/m2 every year,with the comparation of conventional basalt asphalt mixture.Nevertheless,the construction cost of the intermediate layer of steel slag asphalt mixture AC-20C is 57.6 yuan/m2 every year,which is slightly higher than that of conventional limestone asphalt mixture(54.0 yuan/m2 every year).The transportation distance of steel slag has a strong influence on environmental and economic benefits.There are no benefits in the aspect of carbon emission and construction cost when the transportation distance of steel slag is over 171.8 and 225.0 km.Therefore,it is suggested that steel slag is used near the production site,and meanwhile applied in the surface layer to replace basalt,so as to maximize its environmental and economic benefits.16 tabs,7 figs,47 refs.

road engineeringsteel slag asphalt mixturecarbon emissionannual costcarbon fixation potential

王宏祥、黄毅、查旭东

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湖南省交通科学研究院有限公司,湖南长沙 410015

长沙理工大学交通运输工程学院,湖南长沙 410114

道路工程 钢渣沥青混合料 碳排放 费用年值 固碳潜能

国家重点研发计划项目

2019YFC1904700

2024

长安大学学报(自然科学版)
长安大学

长安大学学报(自然科学版)

CSTPCD北大核心
影响因子:1.011
ISSN:1671-8879
年,卷(期):2024.44(3)
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