1. Research Associate, Dept. of Civil Engineering, 2118 Fiedler Hall, Kansas State Univ., Manhattan, KS 66506 (corresponding author).
2. Professor, Dept. of Civil Engineering, 2118 Fiedler Hall, Kansas State Univ., Manhattan, KS 66506.
3. Assistant Geotechnical Engineer, Kansas Dept. of Transportation, Materials and Research Center, 2300 Van Buren, Topeka, KS 66611.
4. Highway Engineer, FHWA-Office of Asset Management, 1200 New Jersey Ave. SE, Washington, D.C. 20590.