利用废料制备再生沥青混合料全生命周期的环境效益评价

Environmental benefit evaluation of new recycled asphalt mixture prepared from waste in whole life cycle

分别以钢渣、铜渣作为再生粗、细骨料,并添加不同掺量的铣刨料(RAP)制备新型再生沥青混合料。基于生命周期分析理论对新型再生沥青混合料的原材料生产、沥青混合料加热拌合、摊铺及碾压4个阶段能耗与碳排放进行评估,并对其环境效益进行分析。结果表明:原材料生产阶段的能耗及碳排放在整个生命周期中影响显著;随着RAP掺量增加,新型再生沥青混合料整个生命周期内的能耗和碳排放呈降低趋势,RAP掺量每增加10%,材料阶段能耗平均降低61.97 MJ/m^(3),碳排放平均降低3.85 kg/m^(3),具有良好环境效益。

In this paper,steel slag and copper slag are used as recycled coarse aggregate and recycled fine aggregate respectively,and milling materials(RAP)with different replacement rates are added to prepare new recycled asphalt mixtures.Based on the life cycle analysis(LCA)theory,the four stages of raw material production,asphalt mixture heating mixing,paving and rolling of new recycled asphalt mixtures are evaluated and the environmental benefit is analyzed.The results show that the energy consumption and carbon emissions in the production stage of materials have a significant impact on the whole life cycle.With the increase of RAP content,the energy consumption and carbon emissions of the new recycled asphalt mixture in the whole life cycle show a downward trend.For every 10%increase in RAP dosage,the average energy consumption in the material stage decreases by 61.97 MJ/m^(3),and the average carbon emissions decrease by 3.85 kg/m^(3),which has good environmental benefits.