1. Airfields and Pavements Branch, U.S. Army ERDC, 3909 Halls Ferry Rd, Vicksburg, MS 39180-6199 US (Corresponding author), e-mail: timothy.w.rushing@usace.army.mil
2. Materials and Construction Industries Chair, Dept. of Civil and Environmental Engineering, Mississippi State Univ., 235F Walker Engineering Building, PO Box 9546, Mississippi State, MS 39762-9546 US, e-mail: ilhoward@cee.msstate.edu