Evaluation of the mechanical and chemical properties of bitumen fractionation via time efficient chromatography techniques.

Bitumen, a crucial component of asphalt pavements, exhibits complex chemical properties that influence its performance. Traditional methods for separating bitumen into saturate, aromatic, resin, and asphaltene (SARA) fractions often suffer from limitations such as low efficiency and insufficient sample recovery. Here, we present a novel approach using flash chromatography to address these challenges. Our automated technique offers rapid and efficient separation of bitumen into fractions, enabling comprehensive characterization. To identify the most suitable column for bitumen characterization, we tested four different commercial columns packed with various stationary phases. By analyzing the separated fractions using analytical chemistry techniques and rheology testing, we demonstrated that each column type exhibits unique separation capabilities. Among the tested columns, the C18 column proved to be particularly valuable for obtaining comprehensive insights into the overall molecular structure and properties of bitumen. This research contributes to a deeper understanding of bitumen's molecular structure and its potential for developing higher-performing and longer-lasting asphalt pavements.