The independent characterization and experimental study of coarse aggregate angularity

Abstract

The morphological parameters of coarse aggregates, including the angularity, flat and elongated (FE) and particle size, strongly influence the performance of asphalt concrete. At present, the measurement of the angularity of coarse aggregate is affected by the particle size and the FE. To achieve independent characterization of angularity, the compression method is used to eliminate the influence of FE on angularity. In this paper, the angularity index (AI) is calculated by fitting ellipse method, which can eliminate the influence of aggregate particle size on the angularity of coarse aggregate. The research results show that the independent characterization of the angularity of coarse aggregates can improve the measurement accuracy of the angularity of coarse aggregates.

Keywords:

• Particle size
• flat and elongated
• angularity
• independent characterization
• compression method

Acknowledgements

The authors are solely responsible for all remaining errors.

Additional information

Funding

The authors are thankful for the financial support provided by the Foreign Cooperation Project in Fujian Province [Grant No. 2018I1006], the Major Project of Industry and University Cooperation in Fujian Province [Grant No. 2016H6013], and the Subsidized Project for Postgraduates’ Innovative Fund in Scientific Research of Huaqiao University [Grant No. 17014080029].