Flat and elongated particle ratio is a shape characteristic for coarse aggregates used in pavements. The ASTM D 4791 is the standard test method to determine flat and elongated coarse aggregate particles in asphalt mixes. However, this method is subjective, making it less reliable to accurate measurements. The objective of this study was to investigate three flat and elongated particles ratios (FERs); 2:1, 3:1 and 5:1 using a modern 3-D laser scanning technique and compare results with ASTM D 4791. Based on the ASTM D4791, the Superpave specification allows for a maximum of 10% coarse aggregates to have FER of 5:1 in asphalt mixes. Eight crushed stones used for road construction in South Africa were investigated. The results indicate that three crushed stones would be rejected by the Superpave specification whereas all eight crushed stones could meet the specification based on the results from the 3-D laser scanning method.
Reference:
Anochie-Boateng, J. & Mvelase, G. 2019. Investigation into Flat and Elongated Particles Ratio for Asphalt Mix Design Using a Modern Laser Technique. In: International Airfield and Highway Pavements Conference 2019, Chicago, Illinois, 21-24 July
Anochie-Boateng, J., & Mvelase, G. M. (2019). Investigation into flat and elongated particles ratio for asphalt mix design using a modern laser technique. http://hdl.handle.net/10204/11131
Anochie-Boateng, Joseph, and Gculisile M Mvelase. "Investigation into flat and elongated particles ratio for asphalt mix design using a modern laser technique." (2019): http://hdl.handle.net/10204/11131
Anochie-Boateng J, Mvelase GM, Investigation into flat and elongated particles ratio for asphalt mix design using a modern laser technique; 2019. http://hdl.handle.net/10204/11131 .
Presented at: International Airfield and Highway Pavements Conference 2019, Chicago, Illinois, 21-24 July 2019. This is the pre-print version of the published item.
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