New admixtures for creating bituminous conglomerates has been developed
that allow substantial amounts of road asphalt to be recycled.
New admixtures for creating bituminous conglomerates has been developed that allow substantial amounts of road asphalt to be recycled.
LCA methodology allowed to compare the environmental impacts caused by manufacturing asphalt containing only pure material, with an asphalt containing
15% RAP (recycled asphalt pavement) and another one with a 40% RAP: these new admixtures promote the use of high percentages of RAP.
Thanks to ACF (Chemical Functional Additives) and the subseguent use of a higher percentage of RAP (also more than 40%), the carbon footprint decreases around of 6% and the ODP (Ozone Depletion Potential) of 30%.
This study had as specific goal the communication of the carbon footprint (as main environmental category); moreover, ten more environmental indicators were considered (according to the specific PCR – Product Category Rules -for the asphalt mixtures).
It is important to underline as the goal of this study was not the EPD (Environmental Product Declaration) certification; so, the choice to follow specific PCR was defined by our determination to operate inside a regulated and shared mode.
Among the considered environmental indicators, only a couple of them highlighted a performance reduction (ADPe: potential of abiotic resources reduction and the potential for terrestrial ecotoxicity) if compared to the standard scenario (with no use of ACF admixture).
Our scope is, of course, to go on with the R&D in this field and improve environmental performances
3 People of Sustainability Dept.
2 People of R&D Admixtures for Concrete
Evidence of success
Our company WAS REWARDED AS BEST PERFORMER IN THE CIRCULAR ECONOMY 2019/2020 devised by Confindustria (the Confederation of the Italian manufacturing and service companies)
The principle difficulties came from recovering specific skills necessaries to complete the LCA study; all datasets were available in international databases with a high data quality.
Some difficulties occurred in finding the right distances which covered the involved raw material transportation.
Potential for learning or transfer
The calculations carried out by the Environmental Sustainability Department showed using asphalt containing 50% RAP resulted in savings in Kg CO2eq compared to asphalt containing only vergin materials. CO2 emissions could be reduced by up to 6% in the case of asphalt with 40% RAP, thanks to the use of ACF Admixtures.
The LCA study highlights as the main contribution to the several environmental categories considered (including the carbon footprint), came from the manufacturing of the bituminous conglomerate and its laying.
Further studies and attention for these aspects (manufacturing of bituminous conglomerates and its laying process), could improve the environmental impacts related to the use of asphalt (not only in Italy but globally).
It is up to the Institutions to select the best technologies available today in the field of asphalt manufacturing and laying (if we talk about the repairing of public roads and motorways for example).