就地热再生沥青路面建设期碳排放分析

Analysis of Carbon Emission during Hot In-place Recycling Asphalt Pavement Construction

为分析就地热再生沥青路面建设期产生的碳排放,采用生命周期分析方法,将建设期划分为材料生产和路面施工两个阶段,根据碳排放系数与活动数据相乘原理建立碳排放模型。结合工程实例计算路面建设期的碳排放,量化不同新料掺比、旧料运距及利用率下的碳排放,对比分析4种路面养护技术的碳排放强度。结果表明:材料生产和路面施工阶段碳排放占比20%和80%;就地热再生新料掺比提高1%,碳排放增加2%;旧料利用率100%的厂拌热再生与就地热再生碳排放相等时的旧料运距为42 km,只有旧料运距高于42 km时,就地热再生碳排放才比厂拌热再生少,当旧料利用率低于75%时,无论旧料运距长短,就地热再生碳排放都比厂拌热再生少;与就地热再生相比,微表处、超薄罩面和铣刨重铺碳排放强度增幅分别为53%,72%和79%。

To analyse the carbon emission of hot in-place recycling asphalt pavement during construction period,the construction period is divided into material production and pavement construction by using the life cycle analysis method,and the carbon emission model is established according to the multiplication principle of carbon emission coefficient and activity data. Combining the engineering example,the carbon emission of pavement construction is calculated,the carbon emission with different new material ratios,different recycled material haul distances and utilization rates of recycling asphalt mixture are quantified,and the carbon emission of 4 pavement maintenance technologies are compared. The result shows that（ 1） carbon emission of material production and pavement construction account for 20% and 80% respectively;（ 2） carbon emission increases by 2% with the increases of hot in-place recycling new material ratio by 1%;（ 3） when hot mix plant recycling with 100% utilization rate of recycled asphalt mixture produces the equal carbon emission with hot in-place recycling,recycled asphalt mixture haul distance is 42 km,only when the haul distance is over42 km,the carbon emission of hot in-place recycling is less than that of hot mix plant recycling,when the utilization rate of recycled asphalt mixture is lower than 75%,the carbon emission of hot in-place recycling is always less than that of hot mix plant recycling no matter how long the haul distance is;（ 4） compared withhot in-place recycling,the increase amplitudes of carbon emission about micro surfacing,ultra-thin overlay and mill and resurface asphalt pavement is 53%,72% and 79% respectively.