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v ACKNOWLEDGMENTS The research reported herein was performed under NCHRP Project 9-26A by the AASHTO Materials Reference Laboratory (AMRL). Dr. Haleh Azari was the principal investigator on the study. AMRL employees, including engineering technicians Mike Stains, John Ardinger, Lynn Mills, and Byron Emerick were very helpful in processing the materials and preparing the samples. The preliminary testing of the materials was conducted by the research laboratory technician, Mohamed Tarawallie. The authors wish to acknowledge the laboratories that participated in this interlaboratory study. Their willingness to volunteer their time and conduct the testing under tight time constraints at no cost to the study is most appreciated. The laboratories include: State Department of Transportation Laboratories: Arizona Department of Transportation, Phoenix, Arizona Florida Department of Transportation, Davie, Florida Florida Department of Transportation, Deland, Florida Florida Department of Transportation, Gainesville, Florida Kansas Department of Transportation, Topeka, Kansas Nevada Department of Transportation, Carson City, NV Oklahoma Department of Transportation, Oklahoma City, Oklahoma Oregon Department of Transportation, Salem, Oregon South Carolina Department of Transportation, Columbia, South Carolina Texas Department of Transportation, Austin, Texas Virginia Department of Transportation, Staunton, Virginia Wisconsin Department of Transportation, Madison, Wisconsin Other Participating Laboratories: Arias & Associates, San Antonio, Texas ATL, Utica, NY 13501 CGMT, Inc, Bensenville, Illinois Chicago Testing Laboratory, Inc., Elk Grove Village, Illinois ConformaTECH, Inc., Tucson, Arizona Earth Systems Southern California, Palmdale, California Engineering & Testing Services, INC., Virginia Beach, VA Falcon Engineering, Inc., Raleigh, North Carolina Floridaâs Turnpike Materials Laboratory, Miami, Florida Fugro Consultants, Inc., Austin, Texas GEO Services, Arlington Heights, Illinois GeoConcepts Engineering, Inc., Ashburn, Virginia MACTEC Engineering & Consulting, Inc., Tampa, Florida Materials Testing & Inspection, Boise, Idaho Mortensen Engineering, Inc., Tampa, Florida NTH Consultants, Ltd., Farmington Hills, Michigan PSI, Inc., Charlotte, North Carolina Triad Engineering, Inc., Hagerstown, Maryland Triad Engineering, Inc., Morgantown, West Virginia Triad Engineering, Inc., Winchester, Virginia
