A back analysis of the monitoring of road structures made with alternative materials was carried out at national scale (France). It underlines the need to harmonize the practices of study around comparable assessment methods and criteria. The assessment of the environmental acceptability of alternative material use in road construction must follow, by adapting it, the eco-compatibility approach used for study and management of waste and by-products: characterization of source, transport and impact terms. The specificities of the road use scenario suggest road soil as the immediate target to be possibly hit by alternative material percolates. On-site diagnosis and laboratory simulations by means of column underline the capacity ofroad soils to fix heavy metals. The stability of fixing is also assessed,by means of fractioning. The acceptability of the contaminated state of road soils is assessed thanks to comparison with reference values. In orderto clarify the effect of the road made of alternative materials on road soils and to allow inter-material and inter-site comparisons, a specific method of assessment by means of indicators is developed; this is applied tofield data and discussed. For the covering abstract see ITRD E139491.
Abstract