Research On The Environmental Impact Of Steel Bridge Deck Pavement Based On Life Cycle Analysis

As the energy shortage and environmental pollution are becoimg serious problems in China,the environmental impact of road engineering is getting more and more concern.Steel deck asphalt pavement is an important part of road engineering,and it should also pay attention to promote environmental-friendly technology.However,the researches on the steel deck pavement mainly focuse on the structure design and material property,and less concern are paid to the environmental impact of the pavement.Therefore,this paper applies life cycle analysis to study the environmental impact of steel deck pavement.Firstly,based on the comparison of the steel deck pavement and the traditional asphalt pavements,the paper proposes to improve the existing road surface life cycle analysis model,which is to establish a life cycle list for the steel deck pavement and to establish a method for evaluating the reliability of the analysis results.The common life cycle analysis methods are summeriazed,and select the process life cycle analysis method to launch the research.Secondly,the life cycle of the steel deck asphalt pavement is divided into four stages,including mixture production,pavement,operation management and pavement remove.On the basis of investigation of environmental influence factors in each stage,the data of energy consumption and gas emission of steel deck asphalt pavement are collected and calculated,and the life cycle list of steel deck asphalt pavement layer is established.And then the pavement life cycle analysis model is improved.The uncertainty index and the sensitivity index are used to evaluate the data quality,and the uncertainty of the analysis result is applied by Monte Carlo simulation.The analysis result is credible when the uncertainty of the analysis result is less than 10%.Thus,the environmental impact analysis model of steel deck pavement based on life cycle analysis is established.Finally,the environmental impact analysis model of steel deck pavement is applied to reseach the environmental impacts of "EA+EA" pavement and "GA+SMA" pavement.The uncertainty of the analysis results is less than 10%,which verifies the reliability of the analysis results.According to the results of the analysis,the PED value of the "GA+ SMA"pavement is about 1.32 times times of the "EA+EA" pavement,GWP value is about 1.59 times times of "EA+EA" pavement,AP value is about 1.63 times of "EA+EA" pavement,RI value is about 1.58 times times of "EA+EA" pavement.Therefore,the environmental impacts of "GA+SMA" pavement is greater than "EA+EA" pavement.And then some suggestions for energy saving and emission reduction of the pavement are put forward based on the results.