基于LCA的不同设计寿命沥青路面能耗排放分析

Energy Consumption and Emission Analysis of Asphalt Pavement with Different Design Working Years Based on LCA

为研究不同设计寿命沥青路面的能耗排放特征,建立生命周期评价体系,量化分析柔性基层沥青路面、典型半刚性基层沥青路面、高掺量胶粉沥青路面的能耗排放。通过灵敏度分析确定主要能耗排放环节,并分析水泥类型、温拌技术、再生技术及运输效率对三种沥青路面能耗排放的影响规律。结果表明,典型半刚性基层沥青路面的能耗强度分别比柔性基层沥青路面及高掺量胶粉沥青路面能耗强度高25.29%、153.03%,全球变暖潜值总量比两种长寿命沥青路面分别高106.97%、107.99%;水泥生产、沥青生产、加热及运输环节为主要能耗排放环节;适用于水稳基层的通用水泥中,矿渣硅酸盐水泥能耗排放最低,替换掉普通硅酸盐水泥后典型半刚性基层沥青路面及高掺量胶粉沥青路面碳排放量分别下降了13.17%、12.43%;采用温拌技术后,柔性基层沥青路面碳排放量下降幅度最大,降低了2.41%,高掺量胶粉沥青路面能耗强度下降幅度最大,降低了3.71%;当RAP掺量达到30%时,三类沥青路面能耗强度分别下降20.64%、18.56%、15.26%,碳排放量分别下降6.92%、3.92%、4.39%;运输效率提升幅度与沥青路面的能耗排放减少率呈正相关,运输效率每提升10%,三类沥青路面能耗强度分别下降1.55%、1.63%、2.10%,碳排放量分别下降4.03%、3.26%、3.07%。

In order to study the energy consumption and carbon emission characteristics of asphalt pavement with different design life,the life cycle evaluation system was established.The energy consumption and carbon emission of flexible base asphalt pavement,typical semi rigid base asphalt concrete pavement and high content rubber modified asphalt pavement were quantitatively analyzed.By analyzing the sensitivity,this work identified the main links of energy consumption and carbon emission.And the influence of cement type,warm mixing technology,recycling technology and transport efficiency on the energy consumption and carbon emission of three kinds of asphalt pavement were analyzed.According to the research results,the energy consumption intensity of typical semi rigid base asphalt concrete pavement is 25.29%and 153.03%higher than that of flexible base asphalt pavement and high content rubber modified asphalt pavement,and the global warming potential value is 106.97%and 107.99%higher than that of the two long-life asphalt pavement,respectively.Cement production,asphalt production,heating and transportation are the main energy consumption and emission links.Among the general-purpose cements used in cement stabilized gravel bases,Portland blast-furnace slag cement(PS)has the lowest energy consumption and carbon emissions.After replacing ordinary Portland cement(PO)by PS,the carbon emissions of typical semi rigid base asphalt concrete pavement and high content rubber modified asphalt pavement dropped by 13.17%and 12.43%.After using the warm mixing technology,the carbon emission of flexible base asphalt pavement decreased the most,by 2.41%and the energy consumption intensity of high content rubber modified asphalt pavement decreased the most,by 3.71%.The reduction rate of energy consumption and carbon emission of typical semi-rigid asphalt pavement after using the warm mixing technology is relatively small.When the RAP content is 30%,three types of asphalt pavement decreases by 20.64%,18.56%and 15.26%respectively,and the carbon emission decreases by 6.92%,3.92%and 4.39%respectively.There is a positive correlation between the improvement rate of transport efficiency and the reduction rate of energy consumption and carbon emission of asphalt pavement.When the transportation efficiency is increased by 10%,three types of asphalt pavement will decrease by 1.55%,1.63%,2.10%respectively,and the carbon emissions will decrease by 4.03%,3.26%,3.07%respectively.