1. Pavements Mechanics Laboratory, Dept. of Civil Engineering, Univ. of Minho, Minho, Portugal (corresponding author).
2. Geotechnical and Environmental Laboratory, Dept. of Civil Engineering, Pontifical Catholic Univ. of Rio de Janeiro, Rio de Janeiro, Brazil.
3. Pavement Mechanics Laboratory, Dept. of Transportation Engineering, Federal Univ. of Ceará, Ceará, Brazil.