Barcelona Tests Olive Pit Biochar Asphalt That Cuts Road Carbon Footprint by 76 Percent
dailygalaxy.comA 2,000-square-meter street trial in Barcelona is testing asphalt made with biochar from olive pits and pine residues. The material replaces conventional limestone filler and early data shows a 76 percent reduction in carbon footprint compared to standard pavement. The biochar is produced through pyrolysis, which locks carbon into a stable solid form instead of releasing it as CO2. Laboratory tests indicate the mix matches or exceeds conventional asphalt in moisture resistance, crack tolerance, and temperature stability. The project came through a municipal innovation contest organized by the Barcelona City Council. Winners received 90,000 euros in funding and the material is now being tested on a live street in the Eixample district. Spain is the world's largest olive oil producer, so the waste stream for this material is large and already concentrated. If the Cerdà Street pilot holds up through a full weather cycle, the city could write biochar asphalt into standard road procurement contracts. Related research is also testing olive pit biochar as a partial sand substitute in concrete, which would open a much larger market for carbon storage in construction materials.