Quantitative Analysis of Environmental Impacts of Micro Surfacing Maintenance with Steel Slag Recycling Technology
Based on the life cycle assessment(LCA)method,a quantitative framework of environmen-tal impact of micro-surfacing maintenance was established.Atomic absorption spectrometer(ICP)was used to evaluate the heavy metal emission characteristics of steel slag aggregate and two kinds of natu-ral aggregate,and the energy consumption and carbon emission of micro-surface curing of steel slag aggregate and basalt were quantitatively compared based on LCA analysis framework.The results show that the heavy metal emission of steel slag aggregate is higher than that of basalt and limestone,but its heavy metal concentration after aging treatment meets the requirements of Class Ⅲ surface wa-ter in China.At the same time,the energy consumption of basalt micro-surface maintenance in func-tional units is 47.25 GJ,accompanied by 2749.52 kg equivalent CO2.However,47.15 GJ is con-sumed at the micro surface of steel slag,and 2848.72 kg equivalent CO2 is produced.Significant differences in the production stages of raw materials lead to more energy consumption of basalt than micro-surfacing maintenance of steel slag aggregate,but less equivalent CO2 emission.
NETL
NSTL
万方数据
