1. Resident Engineer, New Brunswick Dept. of Transportation, Kings Place, P.O. Box 6000, Fredericton NB, Canada E3B 5H1.
2. Associate Professor, DC Campbell Chair in Highway Construction and Pavement Research, Dept. of Civil Engineering, Univ. of New Brunswick, P.O. Box 4400, Fredericton NB, Canada E3B 5A3 (corresponding author).
3. Associate Professor, Patrick Gillin Chair in Construction Engineering, Univ. of New Brunswick, Fredericton NB, Canada E3B 5A3.