Discrete Aggregate Particle Characterization Using Advanced Scanning Techniques

The quantification of discrete aggregate particle characteristics should allow for an increased understanding of how these influence the performance of pavement materials in general. Two advanced techniques, the three dimensional (3-D) laser scanning and scanning electron microscopy (SEM) are considered for the characterization of discrete particles of aggregates and sands respectively. This paper highlights examples of the use of both 3-D laser scanning and SEM techniques with the main objective of illustrating the application in the characterization of unbound materials. The results of image analysis from SEM and 3-D laser scanning device provided information in quantifying and identifying the differences between aggregate particles which may influence the overall performance of unbound pavement materials.