Carbon Emission Reduction Evaluation for the Reuse of Demolition Solid Waste from Existing Infrastructure
To assess CO2 emission of the solid wastes from the existing facilities demolition in highway reconstruction projects,a carbon reduction evaluation method for the reusing and recycling of solid waste is proposed.Based on life cycle assessment theory,a carbon emission activity inventory for the entire process of demolition is established with considering the carbon emission by processing,transportation,and reusing of the waste from existing infrastructure.The range and factors of carbon emissions could be determined,and then carbon emissions based on the carbon emission factor inventory is calculated.Finally,based on the calculation results,decision-making and evaluation of the optimal plan for the demolition and utilization of solid waste from existing facilities are carried out.Based on the reconstruction project of Dongguan section of G4 Beijing-Hong Kong-Macau Expressway,the carbon emission reduction benefit calculation on the demolition and utilization of existing infrastructure shows that the carbon emission reduction of recycled aggregate generated from existing infrastructure is 4.26～22.53 kg/m3,compared with natural materials.The order of carbon emission reduction for the different usages of waste material is special roadbed treatment＞graded crushed stone subbase＞cement stabilized macadam base＞cement concrete pavement surface layer＞cast-in-place integrated bridge deck layer＞drainage and protection project＞New Jersey guardrail.The recommended recycling scheme based on the construction organization plan decision can consume 394 000 m3 solid waste and save 200 200 m3 natural aggregate.It is expected to reduce CO2 emission by 2.070 5 million kg,and the average carbon reduction of recycled aggregate is about 10.34 kg/m3.
highway engineeringreconstructionexisting facilitiesdemolition and utilizationcarbon reduction
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