This work aims to explore the process of CO2 solubilization/adsorption in bitumen and bituminous materials. This process has been extensively characterized in scientific literature under relatively high-pressure conditions (20-100 bar). The purpose of this work is to study the phenomenon at ambient or low pressure, to determine the process kinetics, the CO2 storage stability, and the maximum CO2 capacity of the investigated materials: an asphalt aggregates sample and two bitumen formulations, one of which modified with additives incorporation. The work is developed in three steps. In the first step the bitumen-CO2 system is characterized at ambient pressure; in the second step the system is investigated in the 1-20 bars pressure range; in the final part of the work the bitumen formulations are subjected to temperatures up to 160 ºC and the released volatile components are characterized by Gas Phase Chromatography.