Evaluation of aggregate size effect on asphalt mixture homogeneity using image analysis

Yücel, Ayhan Öner
Güler, Murat
The purpose of this study is to evaluate effect of aggregate size fractions on asphalt mixture inhomogeneity by means of a proposed inhomogeneity test method. The study of inhomogeneity is conducted using 2-dimensional, vertical section images of asphalt concrete specimens that are produced using the Superpave gyratory compactor. Mixture inhomogeneity is evaluated based on aggregates distribution because aggregates are the primary constituent governing the inhomogeneity level of asphalt mixtures during the compaction process. The procedure starts with determining the shape properties of aggregate particles that are identified after applying a series of image processing and analysis procedures. In order to capture the level of mixture inhomogeneity, a redistribution algorithm is developed that is capable of redistributing aggregate particles to generate synthetic cross sectional images. In this way, many combinations of aggregate distributions are produced to statistically analyze for inhomogeneity level. The proposed method is applied for asphalt concrete specimens prepared using two aggregate types and two gradations. Results of analyses show that particles larger than 4.75 mm sieve size have more pronounced effect on inhomogeneity than do smaller particles.
Citation Formats
A. Ö. Yücel and M. Güler, “Evaluation of aggregate size effect on asphalt mixture homogeneity using image analysis,” presented at the 13th International Congress on Advances in Civil Engineering, 2018, Izmir, Turkey, 2018, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/87306.