Study on Quantification of Carbon Emissions During the Whole Life Cycle of Highway Construction
Based on the whole life cycle theory,the carbon emission analysis framework of highway construction pe-riod was established,the carbon emission accounting model of each stage was proposed.The key carbon emission and carbon reduction stages were identified and analyzed by carbon emission intensity and sensitivity coefficients.The case study shows that the carbon emissions in the material production stage is the largest,accounting for 85.03％,while the construction and material transportation stages accounted for 10.09％and 4.88％respectively;The main carbon emissions in each stage come from subgrade engineering,crossing engineering,and bridge and culvert engineering;The main carbon emission sources of each stage are cement,dump truck and earthwork ma-chinery;In addition,the carbon emission intensity of the material production stage is the largest,and the sensitivity coefficient of 0.170 is the highest after the carbon emission intensity was reduced by 20％,indicating that the material production stage has the greatest impact on the carbon emission during the highway construction period.The techni-cal measures for energy conservation and emission reduction should be strengthened during the material production.By combining the methods of quantification of carbon emission in the highway construction period of highway engi-neering and the identification of key carbon emission stages,it provides method support for improving the effect of green and low-carbon transformation of highway construction projects.
highwaywhole life cycle theorycarbon emission accountingcarbon emission intensitysensitivity analysis
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