Study On Energy Consumption And Carbon Emission Of Rural Highway During The Whole Life Period In Inner Mongolia Autonomous Region

The construction of rural roads is related to thousands of households,which is related to the basic life and fundamental interests of the peasant masses in the vast rural areas of China.It is also the basic channel for the flow of people and goods to the city;the total energy consumption and total emissions during the life cycle of rural road construction are huge,which affects the overall implementation effect of highway energy conservation and emission reduction in China.The paper studies the impact on the environment in the life cycle of rural roads in Inner Mongolia,selects three typical pavement structures in Inner Mongolia,and calculates the energy consumption and carbon emissions of the rural roads during the whole life cycle,and compares the typical pavement structure with the environmental assessment model.The study made a useful exploration for the construction of green rural roads in Inner Mongolia and the construction of “four good rural roads”.The basic theory of LCA method engineering application is analyzed in paper,consulting the related applications of LCA in the field of highway engineering,and using the life cycle analysis framework to analyze the influencing factors of the road construction materials,rural road construction,operation maintenance and reconstruction in rural road life cycle.To determining the calculation range of energy consumption,selecting 1km long rural road as a unit,using the actual project inventory usage,establishing a calculation model,the calculation results show that the model is reasonable and correct.The production stage of road construction materials is the stage with the highest energy consumption and the highest discharge during the construction period of rural roads;due to the large amount of cement,the cement concrete pavement has the highest total energy consumption among the three pavement structures.However,after comprehensive consideration of the service life of the three pavement structures,the gravel pavement consumes the most energy and the cement pavement consumes the least energy.The paper adopts the life cycle environmental impact assessment method proposed by the environmental design.The exhaust gas emitted by the three pavement structures during the construction of rural roads is divided into four types: global warming,photochemical smog,eutrophication and acidification.The four types of environmental impact represent the dimension of the gas.By weighting the four types of environmental impacts into a unified dimension,the environmental impact values of the four pavement structures are obtained and the service life is integrated.The results show that cement concrete pavement is the road with the least impact on the environment;rural roads will increase the probability of occurrence of the above four environmental impacts during the whole life cycle,among which photochemical smog has the highest risk.The using of cement roads in rural roads is the most environmentally friendly.The construction process is relatively simple,which is convenient for small-volume construction.By reducing the energy consumption and emissions of cement production through more advanced technologies,the environmental impact can be further reduced.