The construction industry is one of the major producers of municipal solid waste.Although there are many studies in municipal solid waste management,the research on the recovery of recyclable building material from co...The construction industry is one of the major producers of municipal solid waste.Although there are many studies in municipal solid waste management,the research on the recovery of recyclable building material from construction sites remains limited.This paper addresses the optimal design issue of the construction and demolition(C&D)waste logistics network based on the features of the construction industry from the contractors’perspective.The purpose of this paper is to provide an optimal C&D waste recycling network decision(RND)model considering the change of construction sites location over time.A multi-period and multi-objective mixed-integer linear programming model was developed to minimize the cost of C&D waste disposal for contractors,and to minimize the carbon emissions from C&D waste transportation.An application study was conducted to assess the performance of the RND model.Through some sensitivity analysis experiments based on an immune genetic algorithm,the influences of environmental policies and carbon tax policy on improving the recycling rate of C&D waste and reduce the carbon emission were explored.The findings of this research suggest that:(1)a RND model with the feature of the construction industry developed in this paper can effectively optimize the C&D waste logistics network;(2)government policies and laws are valid political instruments to improve the recycling rate of C&D waste;(3)the carbon-tax analyses demonstrate that a carbon tax policy can effectively reduce carbon emissions.展开更多
Construction and demolition(C&D)waste has seriously affected the ecological environment.The utilization of C&D waste resources can greatly alleviate this problem,and it is an important way to help achieve the ...Construction and demolition(C&D)waste has seriously affected the ecological environment.The utilization of C&D waste resources can greatly alleviate this problem,and it is an important way to help achieve the goal of zero carbon in 2050.In this study,insulation concrete blocks were developed with recycled aggregates,cement,fly ash as main raw materials,expanded polystyrene(EPS)insulation boards as block insulation filling material,and selfdeveloped construction waste composite activator,interface enhancer,surface modifier and other additives.Through experimental research and performance test analysis,the best mix ratio of the product and the mechanism of each additive were proved.The experimental results showed that the insulation concrete block prepared under the conditions of recycled aggregates sand ratio of 45%,active activator Na_(2)SO_(4)content of 0.15%and fly ash content of 30%has the best performance and meets the relevant standards.展开更多
基金financial support provided by Fundamental Research Funds for the Central Universities-China(No.2018CDJSK03XK15)project support by the National Planning Office of Philosophy and Social Science Foundation of China-China(No.18BJY06).
文摘The construction industry is one of the major producers of municipal solid waste.Although there are many studies in municipal solid waste management,the research on the recovery of recyclable building material from construction sites remains limited.This paper addresses the optimal design issue of the construction and demolition(C&D)waste logistics network based on the features of the construction industry from the contractors’perspective.The purpose of this paper is to provide an optimal C&D waste recycling network decision(RND)model considering the change of construction sites location over time.A multi-period and multi-objective mixed-integer linear programming model was developed to minimize the cost of C&D waste disposal for contractors,and to minimize the carbon emissions from C&D waste transportation.An application study was conducted to assess the performance of the RND model.Through some sensitivity analysis experiments based on an immune genetic algorithm,the influences of environmental policies and carbon tax policy on improving the recycling rate of C&D waste and reduce the carbon emission were explored.The findings of this research suggest that:(1)a RND model with the feature of the construction industry developed in this paper can effectively optimize the C&D waste logistics network;(2)government policies and laws are valid political instruments to improve the recycling rate of C&D waste;(3)the carbon-tax analyses demonstrate that a carbon tax policy can effectively reduce carbon emissions.
基金This work was supported by Science and technology project of housing and urban-rural Development Department of Shandong Province(2018)and Shandong Provincial Social Science Planning Research Project(20CGLJ13).
文摘Construction and demolition(C&D)waste has seriously affected the ecological environment.The utilization of C&D waste resources can greatly alleviate this problem,and it is an important way to help achieve the goal of zero carbon in 2050.In this study,insulation concrete blocks were developed with recycled aggregates,cement,fly ash as main raw materials,expanded polystyrene(EPS)insulation boards as block insulation filling material,and selfdeveloped construction waste composite activator,interface enhancer,surface modifier and other additives.Through experimental research and performance test analysis,the best mix ratio of the product and the mechanism of each additive were proved.The experimental results showed that the insulation concrete block prepared under the conditions of recycled aggregates sand ratio of 45%,active activator Na_(2)SO_(4)content of 0.15%and fly ash content of 30%has the best performance and meets the relevant standards.
