Applications of Surface Chemistry and Physics to Bituminous Mixtures by Norman W. McLeod explores how principles of surface chemistry and physics can improve the performance of bituminous mixtures in road and airport surfacing. Presented in 1937 to the Association of Asphalt Paving Technologists, this study suggests that the traditional requirement of dry aggregates for effective bitumen coating can be circumvented through surface modifications. By using specific chemical reagents to alter the surface properties of aggregates, enabling greater adhesion for bitumens over water, McLeod aims to create thermodynamically stable bituminous surfaces, even when the aggregates are wet. This approach potentially eliminates the need for expensive drying equipment and delays due to wet conditions, thereby reducing costs. The findings offer practical applications for constructing durable bituminous surfaces with wet aggregates, presenting a significant advancement in paving technology.