To explore the feasibility of recycling industrial waste as building materials,this study developed an environmentally friendly,low-carbon pervious concrete(PC).This study used coal gangue micro-powder(CGMP)and ground...To explore the feasibility of recycling industrial waste as building materials,this study developed an environmentally friendly,low-carbon pervious concrete(PC).This study used coal gangue micro-powder(CGMP)and ground granulated blast furnace slag(GGBS)as supplementary cementitious materials to partially replace cement.Coal gangue sand(CGS)was used as fine aggregate,while municipal solid waste incineration slag(MSWI)and natural crushed stone aggregate(NCA)were used as coarse aggregates.The study investigated the effects of single-doping of CGMP(proportions:10%,20%,30%,40%)and composite doping of CGMP and GGBS(total admixture amount of 30%with CGMP-to-GGBS ratios of 1:1,1:2,and 2:1)on the compressive,splitting tensile,and flexural strength,permeability,pore structure,and frost resistance of PC.Additionally,carbon dioxide(CO_(2))emissions and cost analyses were conducted.The results showed that single-doping of CGMP led to a decline in the mechanical properties and a deterioration of the permeability of PC.When the two materials were co-doped at a ratio of 1:2,the specimens exhibited a synergistic improvement in mechanical properties,although the permeability decreased.The 7-day and 28-day compressive strengths were 19.8 MPa and 24.6 MPa,respectively,and the permeability coefficient was 1.9 mm/s.In terms of freeze–thaw resistance,increasing the proportion of GGBS in the composite doping of mineral admixtures could improve frost resistance.Furthermore,the loss rate of compressive strength proved to be the most sensitive indicator of freeze–thaw effects,making it the most suitable parameter for durability assessment.In terms of carbon efficiency,life cycle assessment(LCA)indicates that compared with normal concrete pavement(NCP),the life-cycle carbon emissions per cubic meter of PC pavement prepared by the G10S20 scheme(a composite doping scheme with a total admixture content of 30%,including 10%CGMP and 20%GGBS)are reduced by 14.28%(from 410.148 kg CO_(2)e to 351.577 kg CO_(2)e),and by 14.80%compared with normal pervious concrete pavement(NPCP).In addition,cost analysis confirms that the construction cost of G10S20 pavement is 22.38%lower than that of NCP and 14.46%lower than that of NPCP.This material can effectively alleviate urban waterlogging,mitigate the heat island effect,and has both low-carbon and economic advantages when applied in scenarios such as urban roads,squares,and park ground paving.It thus provides practical evidence for the promotion of sustainable building materials.展开更多
基金First Class Discipline Construction in Ningxia Colleges and Universities(discipline of water conservancy engineering)(NXYLXK 2021A03).
文摘To explore the feasibility of recycling industrial waste as building materials,this study developed an environmentally friendly,low-carbon pervious concrete(PC).This study used coal gangue micro-powder(CGMP)and ground granulated blast furnace slag(GGBS)as supplementary cementitious materials to partially replace cement.Coal gangue sand(CGS)was used as fine aggregate,while municipal solid waste incineration slag(MSWI)and natural crushed stone aggregate(NCA)were used as coarse aggregates.The study investigated the effects of single-doping of CGMP(proportions:10%,20%,30%,40%)and composite doping of CGMP and GGBS(total admixture amount of 30%with CGMP-to-GGBS ratios of 1:1,1:2,and 2:1)on the compressive,splitting tensile,and flexural strength,permeability,pore structure,and frost resistance of PC.Additionally,carbon dioxide(CO_(2))emissions and cost analyses were conducted.The results showed that single-doping of CGMP led to a decline in the mechanical properties and a deterioration of the permeability of PC.When the two materials were co-doped at a ratio of 1:2,the specimens exhibited a synergistic improvement in mechanical properties,although the permeability decreased.The 7-day and 28-day compressive strengths were 19.8 MPa and 24.6 MPa,respectively,and the permeability coefficient was 1.9 mm/s.In terms of freeze–thaw resistance,increasing the proportion of GGBS in the composite doping of mineral admixtures could improve frost resistance.Furthermore,the loss rate of compressive strength proved to be the most sensitive indicator of freeze–thaw effects,making it the most suitable parameter for durability assessment.In terms of carbon efficiency,life cycle assessment(LCA)indicates that compared with normal concrete pavement(NCP),the life-cycle carbon emissions per cubic meter of PC pavement prepared by the G10S20 scheme(a composite doping scheme with a total admixture content of 30%,including 10%CGMP and 20%GGBS)are reduced by 14.28%(from 410.148 kg CO_(2)e to 351.577 kg CO_(2)e),and by 14.80%compared with normal pervious concrete pavement(NPCP).In addition,cost analysis confirms that the construction cost of G10S20 pavement is 22.38%lower than that of NCP and 14.46%lower than that of NPCP.This material can effectively alleviate urban waterlogging,mitigate the heat island effect,and has both low-carbon and economic advantages when applied in scenarios such as urban roads,squares,and park ground paving.It thus provides practical evidence for the promotion of sustainable building materials.
