Hot mix asphalt Malagasy: energy consumption and carbon footprint

The field of Civil Engineering, the birthplace of the global economy, is one of the most energyintensive and the most emissive in greenhouse gases (GHG).In Madagascar, a multitude of road projects are currently being considered.However, the environmental assessment is often carried out in a very superficial way and its results did not really reflect the severity of the impacts.This study focused on the calculation of carbon footprint and energy consumption of 1m 3 of each Hot Mix Asphalt (HMA) product mainly used in a Malagasy road construction.The environmental review used the methodological frameworks of the Life Cycle Assessment (ISO 14040-14044).In this case study, "the cradle to the HMA construction phase" approach is chosen.The Life Cycle Inventory (LCI) takes into account the technical and technological standards of the road engineering and then the geographical and energy contexts of Madagascar.Modeling and processing of LCI data will be conducted in the SIMA PRO tool, to be translated into impact categories.On the road-paving materials side, Semi-Coarse Hot Asphalt revealed a GHG emission and an energy consumption of 116kgCO2eq/m3 and 1720 MJ/m3 for class 0/10 then 119kgCO2eq/m3 and 1760MJ/ m3 for class 0/14.Similarly, the classic Dense Hot Asphalt 0/12.5 has a GHG emission of 116kgCO2eq/m3 and an energy consumption of 1710MJ/m3.On the road base material side, Grave-bitume 0/14 has a GHG emission of 105kgCO2eq/m3 and an energy consumption of 1550MJ/m3.