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ACKNOWLEDGMENTS The research reported herein was performed under NCHRP Project 9-26 by the AASHTO Materials Reference Laboratory (AMRL). Mr. Ron Holsinger was the principle investigator on the study, Mr. Pete Spellerberg served as the co-principal investigator, and Dr. Charles Antle was the consultant on the statistical analysis procedure. Mr. Adam Fisher and other AMRL staff members assisted with various phases of the project. Special thanks are extended to the laboratories participating in the AMRL Proficiency Sample Programs used in this study. vii
