Calculation method of stockpiling and use phase in road LCA: Case study of steel slag recycling

The environmental assessment of EAF-S recycling in road using LCA is investigated in this paper. Generally, in the LCA framework, the environmental assessment of recycling waste doesn’t take into account the phases of life cycle corresponding to stockpiling and use, as they are considered to have no impact, only waste processing is counted. Thus, we propose to assess recycling of EAF-S in road considering the phases of processing, stockpiling, transport and use in road. The calculation of use phase based on results from percolation test is compared to its calculation based on Ecoinvent data (total content and a transfer factor), in order to seek if the results are in the same range or not and propose recommendation on the use of Ecoinvent data in case of lack of data for waste materials. The impact indicators calculated are: energy, global warming potential, ecotoxic and toxic potentials using Ecorcem and OpenLCA softwares. (results from x-ray fluorescence) and a transfer factor (from Ecoinvent data base), in order to seek if the results are in the same range or not and propose recommendation on the use of Ecoinvent data in case of lack of data for waste materials. 2 METHODS AND MATERIALS PROPERTIES