Oklahoma Department of Transportation 200 NE 21st Street, Oklahoma City, OK 73105-3204 FINAL REPORT ~ FHWA-OK-14-02 DRYING SHRINKAGE PROBLEMS IN HIGH PI SUBGRADE SOILS Rifat Bulut, Ph.D. Lizhou Chen Sruthi Mantri Omar Amer Yi Tian School of Civil Engineering and Environmental Engineering College of Engineering, Architecture and Technology Oklahoma State University Musharraf Zaman, Ph.D., P.E. School of Civil Engineering and Environmental Science College of Engineering The University of Oklahoma January 2014 Implementation of Research for Transportation Excellence [email protected] Materials and Research Division Research & Implementation