ABSTRACT
This study explores the potential of using biochar, which is a renewable, more accessible, and sustainable asphalt additive. Fine biochar passing a 75μ sieve was used in different percentages to prepare asphalt mixes in the laboratory. 4, 8, and 12% by weight of biochar was added to a mix designed for a surface course. The theoretical maximum specific gravity of the asphalt mixes decreased with an increase in biochar percentage and reached an inflection point between 8 and 12%. An improvement in workability in samples with biochar was found during compaction. To study the moisture susceptibility of asphalt mixes made with biochar, Modified Lottman test was also conducted. No signs of stripping were observed in any specimen. Results revealed an improvement in the tensile strength ratio with the inclusion of biochar.
