Evaluation Model And Method For Energy Consumption And Emissions Of Freeway Reconstructed Project

The deterioration of ecological environment caused by energy consumption and emissions has aroused more and more attention by the whole society.With the guidance of “Green Road” which is actively promoted by Ministry of Transport,cold mix emulsified bitumen asphalt recycling technology,regeneration of soil cement,polymer grouting and other energy-saving and emissions reduction technology have been widely applied in freeway construction projects in Anhui Province.Based on the reconstruction project,this paper will use the method of Full Life Cycle Analysis.By the on-site data investigation,the quantitative analysis of energy consumption and emissions of the technical scheme of reconstruction project will be examined.Moreover,the evaluation index and model of energy-saving and emissions reduction of asphalt pavement reconstruction project is put forward.The research contents are as follows:(1)Energy saving and emissions reduction analysis and evaluation model of asphalt pavement reconstruction project;(2)Quantitative analysis of energy consumption and emissions of raw material production period;(3)Quantitative analysis of energy consumption and emissions during construction period of asphalt pavement reconstruction;(4)Emissions reduction technology application and effect analysis;(5)energy saving and emissions reduction evaluation index and evaluation system of asphalt pavement reconstruction project.Through on-site investigation and data analysis,the following conclusions were drawn:(1)On the basis of Full Life Cycle Analysis,the process of using the inventory analysis method in the asphalt pavement construction or reconstruction project is established.Combined with the requirements of the green freeway and the characteristics of the reconstruction project,the quantitative calculation method of energy consumption and emissions is clarified,and the basic model framework for energy-saving and emissions reduction of asphalt pavement reconstruction project is established.(2)1t recycled aggregate production energy consumption is between0.51-0.66 kgce,which occupies about 50% of the new aggregate energy consumption(0.86-1.29).Based on the reconstruction project,a total number of 309814.1t of recycled aggregate is used to realize 100% recycling of waste asphalt pavement material,thus saving about 300519.7t of new aggregate.(3)During the construction of asphalt layer,the proportion of energy consumption and discharge of asphalt mixture are the largest,which occupies 77.4% and 82.1%,respectively,andconsidered as the key to reduce energy consumption and emissions.(4)The energy consumption and emissions of the 1km cold recycled base structural layer are only8.8% and 7.8% of those in the large grain pitch gravel base.Considering the two stages of raw material production and construction period,the energy consumption and emissions of cold recycled base are 60.9% and 59.9% of those in the large-stone asphalt macadam grassroots.The energy consumption and emissions of 1km cold recycled base are less than those in the large-stone asphalt macadam grassroots for7997.2kgce,22427.1kg.Relying on the total energy savings of 1.88 × 106 kgce and emissions reduction of 5.39 × 106 kg,energy-saving and emissions reduction effect of cold recycling base is significant.(5)With the core of "material saving,energy saving and emissions reduction",secondary evaluation index system of energy-saving and emissions reduction for the asphalt pavement reconstruction project is established,and the green concept of comprehensive quantitative evaluation method of energy saving and emissions reduction is proposed.The research results will further promote the application of energy-saving and emissions reduction technology.