** AWARDS ISSUED PRIOR TO JANUARY 20, 2025, WERE FUNDED UNDER PREVIOUS ADMINISTRATIONS AND MAY NOT REFLECT THE PRIORITIES AND POLICIES OF THE CURRENT ADMINISTRATION.** ASPHALT CONCRETE IS A GREENHOUSE GAS INTENSIVE MATERIAL WHICH IS USED TO SURFACE MORE THAN 94% OF PAVED ROADS IN THE UNITED STATES. ONE OF THE CRITICAL ISSUES CURRENTLY FACED BY THE ASPHALT INDUSTRY IS PRODUCING MORE SUSTAINABLE MATERIALS, OF WHICH BIOPRODUCTS CAN SERVE AS ONE OPTION. THIS PROJECT SEEKS TO USE BIOCHAR DERIVED FROM WASTE TIMBER VIA MASS PYROLYSIS AND OTHER BIOMASS TREATMENT PROCESSESIN ASPHALT CONCRETE MIXES, TO BOTH LOWER THE GREENHOUSE GAS FOOTPRINT OF ASPHALT MIXTURES AND REDUCE HARMFUL EMISSIONS DURING PRODUCTION AND CONSTRUCTION OF ASPHALT PAVEMENTS. THIS PROJECT WILL EVALUATE THE USE OF BIOCHAR FROM THE PERSPECTIVE OF PERFORMANCE OF ASPHALT MATERAILS AND PRESERVATION TREATMENTS WHICH USE IT COMPARED TO THOSE CURRENTLY USED IN ROADWAY SYSTEMS, AS WELL AS ECONOMIC AND ENVIRONMENTAL ANALYSIS TO DETERMINE HOW FEASIBLE REPLACEMENT WITH BIOCHAR OF FINE AGGREGATE IS. FINALLY, THE PROJECT WILL INVOLVE A FRAMEWORK FOR FULL-SCALE TESTING FOR ACCELERATION OF THIS TECHNOLOGY TO USE IN PRACTICE.