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ACKNOWLEDGMENTS This research was performed under NCHRP Project I-28 by the School of Civil and Environmental Engineering, the Georgia Institute of Technology and the Department of Civil Engineering at North Carolina State University. The Georgia Institute of Technology was responsible for overall project management, performance of resilient modulus testing of aggregate base materials, the aggregate base round-robin study and the statistical Monte Cario study of the influence of resilient modulus testing variability on pavement thickness. Georgia Tech also performed Be field aggregate breakage studies and measured In the field residual compaction stresses in aggregate bases. The North Carolina State University was responsible for the resilient modulus testing of asphalt concrete, laboratory testing of subgrade soils, the back-calculation study of resilient modulus from falling weight deflectometer data and the asphalt concrete and subgrade soil round-robin studies. The Georgia Institute of Technology received approximately I/3 of the project funding and North Carolina State University received approximately 2/3 of the funding. Richard D. Barksdale, Professor of Civil Engineering, Georgia Tech, was Principal Investigator. N. Paul Khosla, Professor of Civil Engineering, N.C. State, was Co-Principal Investigator. The authors of the report are Prof. Barksdale and Jorge Alba, former Research Assistant, Georgia Tech and from N.C. State Prof. Khosla, Prof. Kim, Prof. Lambe, and Prof. Rahman. Great appreciation is expressed to the many excellent graduate and undergraduate students who participated in this study. Special recognition is extended to Dr. Samir Itani and Dr. Ero! TutumIuer, former graduate students at Georgia Tech, for their important contributions. Sincere appreciation is also expressed to He many excellent engineers with State DOTs who made valuable contributions to this project. Special acknowledgment is given to the following states which participated in the round-robin studies: Minnesota, North Carolina, Texas, Virginia and Washington State. VuicanMater~alsCornpany and the University of Texas at E! Paso also participated in the round-robin studies and their important contributions are also gratefully acknowledged. Finally, He report could not have been prepared without the dedicated help and patience of Vicki Clopton, who typed the several interim and final report manuscripts, and Bonnie Barksdale for proofing manuscripts and also her typing contribution. iv