1. Graduate Student, Civil Engineering, Louisiana Tech Univ., 600 Dan Reneau Dr., Bogard Hall M118C, Ruston, LA 71272-0046, US (Corresponding author), e-mail: mri007@latech.edu
2. Graduate Student, Civil Engineering, Louisiana Tech Univ., 600 Dan Reneau Dr., Bogard Hall M118C, Ruston, LA 71272-0046, US, e-mail: sas060@latech.edu
3. Robert Howson Associate Professor of Civil Engineering, Louisiana Tech Univ., 600 Dan Reneau Dr., Bogard Hall 245, Ruston, LA 71272-0046, US, e-mail: wasi@latech.edu
4. P.E., Materials Research Administrator, Louisiana Transportation Research Center, 4101 Gourrier Ave., Baton Rouge, LA 70808, US, e-mail: bill.king@la.gov