This research studied the feasibility of using biochar as a filler in bituminous mixtures, with the ultimate goal of evaluating its decarbonization potential. To this end, biochar from two sources (olive stones and olive pomace) was used, as well as a conventional filler (calcium carbonate) as a reference. First, the physical characteristics of each filler and the behavior of the bituminous mastic with different volumetric concentrations of each were analyzed to determine the optimal concentration in each case. Secondly, based on these dosages, the mechanical response of a gap-graded mixture (BBTM) manufactured with each of the fillers was analyzed through water sensitivity and crack resistance tests. The results show that it is could be possible to replace the entire filler with biochar, depending on its nature. Finally, a calculation was made of the reduction in CO 2 emissions from the bituminous mixture using biochar as a filler, obtaining a reduction in emissions of up to 76%. • Using biochar in asphalt mixtures is a key factor in pavement decarbonization. • The conventional filler can be replaced by biochar, taking into account its origin. • A 76% reduction in CO 2 emissions was estimated when CaCO 3 was replaced by biochar. • Physical characteristics of biochar affect the performance of bituminous mixtures. • The ITSR using olive pit biochar meets the requirement stablished in the standard.
Hernández-Barrera et al. (Sat,) studied this question.