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Abstract
A combined laboratory and field study was undertaken to evaluate the effect of gradation on resilient modulus (M R) and falling weight deflectometre (FWD) modulus (M FWD) as measures of stability and coefficient of permeability (k) as an indicator of drainability of aggregate bases. Aggregates from three different sources in Oklahoma and three gradations consisting of M-AASHTO #57, ODOT Type A and OKAA Type M were used. M R and k tests on compacted aggregate specimens were conducted in the laboratory. Also, a 152.4-m long test section was constructed with the aforementioned gradations and FWD and in-situ falling head permeability tests were conducted periodically. Results showed that denser gradations resulted in higher M R and M FWD and lower k values, both in the laboratory and in the field. M FWD and field k values were found to increase and decrease, respectively, with time, possibly due to traffic-induced compaction. Regression models were developed to estimate M R and k in terms of gradation and source properties of aggregates.
Acknowledgements
The authors would like to acknowledge the financial support provided by the Oklahoma Department of Transportation (ODOT) and the Federal Highway Administration (FHWA) for this study. The research team is thankful to Jeff Dean, Dawn Sullivan, Scott Cosby, Vincent (Buch) Reidenbach, Chris Clarke and Ginger McGovern, all from ODOT, for their assistance in this project. The research team would like to thank financial support of Oklahoma Aggregate Association (OKAA), specifically, Anchor Stone Co., APAC-Oklahoma, Arbuckle Materials, Dolese Bros. Co., Hanson Aggregates, Haskell Lemon Construction Co. Inc., Joe Brown Trucking, Martin Marietta Materials, Valero Energy Corp., Pryor Stone Co. Inc., Sherwood Construction Co. Inc. and Silver Star Construction for their support in constructing the test road. Special thanks are extended to Jim Rodriguez, Executive Director of OKAA, for his leadership in putting the OKAA member companies together. Thanks are extended to Jay Lemon, Craig Parker, Roger Madson, Mike Hall and Neil Simmons, all affiliated with OKAA member companies, particularly for their assistance in planning and execution of construction of the test road. The authors would like to specifically acknowledge Karim Saadeddine, Kunal Shah, Ashish Gupta, Curtis Doiron, Roy Khalife and Zahid Hossain for their assistance and support. Special thanks are extended to Michael Schmitz, Dr Joakim Laguros, David Ross Boyd Emeritus Professor of Civil Engineering, College of Engineering staff, including Karen Horne, Luanne Howk and Karen Kelly and the OU Police Department.