基于全生命周期评价的掺石灰石粉再生混凝土环境影响研究

Study on environmental impact of recycled concrete with limestone powder based on whole life cycle assessment

用石灰石粉部分取代水泥制备了再生混凝土(LP-RAC),并基于生命周期评价(LCA)方法,通过计算LP-RAC全生命周期(生产阶段、使用阶段、废弃阶段)产生的9种污染气体量(CO_(2)、CO、NO_(x)、SO_(2)、CH_(4)、N_(2)O、NH_(3)、PM10、NMVOC)及其对6种环境影响类型[气候变化潜值(GWP)、环境酸化潜值(AP)、非生物资源消耗潜值(ADP)、富营养化潜值(EP)、可吸入无机物(RI)、光化学臭氧合成潜值(POFP)]的“贡献率”,评价了LP-RAC全生命周期的环境影响。结果表明:LP-RAC的生产阶段对6种环境影响类型的“贡献率”均最大;在LP-RAC的生产阶段,水泥生产环节对GWP和RI的“贡献率”最大,直接排放环节对AP、EP和POFP的“贡献率”最大,河砂开采环节对ADP的“贡献率”最大。

The recycled concrete(LP-RAC)was prepared by replacing some cement with limestone powder.Based on the life cycle assessment(LCA)method,the environmental impact of the whole life cycle(production stage,utilization stage,disposal stage)of LP-RAC was evaluated by calculating the amount of 9 types of polluting gases(CO_(2)、CO、NO_(x)、SO_(2)、CH_(4)、N_(2)O、NH_(3)、PM10、NMVOC)and their"contribution rate"to 6 types of environmental impact[global warming potential(GWP),acidification potential(AP),abiotic depletion potential(ADP),eutrophication potential(EP),respirable inorganic material(RI),photochemical ozone formation potential(POFP)].The results show that the production stage of LP-RAC has the highest"contribution rate"to the 6 types of environmental impact.In the production stage of LP-RAC,the cement production process has the highest"contribution rate"to GWP and RI,the direct emission process has the highest"contribution rate"to AP,EP and POFP,and the river sand mining process has the highest"contribution rate"to ADP.