Resumen:
In the road construction sector, a number of measures and alternatives have been proposed to reduce the emissions of greenhouse gases (GHG). While these measures can result in a notable abatement of this impact, when analyzed independently and in absolute terms, they are not equally relevant within a common context, such as a complete road transport infrastructure project. In this work, we analyze a broad range of scenarios for emission reduction combining plausible options given the current state of technology and involving those elements of road construction and maintenance with major contributions to the total balance of emissions. The selection of scenarios goes beyond the usual perspectives focused on pavements and materials, and includes other factors dealing with machinery, transport distance, energy sources, land-use change, as well as combined scenarios intended to find optimal alternatives. This has been achieved using the tool CO2NSTRUCT, which considers a life-cycle assessment approach for road transport infrastructure in evaluating GHG emission, thus providing an adequately comprehensive context for comparing relative contributions. This common reference enables to accomplish the ran...