1. Russ Professor, Civil Engineering Dept., Ohio Univ., Athens, OH 45701.
2. Assistant Professor, Civil Engineering Dept., Ohio Univ., Athens, OH 45701 (corresponding author).
3. Graduate Research Assistant, Civil Engineering Dept., Ohio Univ., Athens, OH 45701.
4. Asphalt Materials Engineer, Ohio Dept. of Transportation, Columbus, OH 43223.