1. Research Fellow, Dept. of Civil and Environmental Engineering, Brunel Univ. London, Uxbridge, Middlesex UB8 3PH, United Kingdom.
2. Professor, Dept. of Civil and Environmental Engineering, Brunel Univ. London, Uxbridge, Middlesex UB8 3PH, United Kingdom (corresponding author).
3. Lecturer, Dept. of Civil and Environmental Engineering, Brunel Univ. London, Uxbridge, Middlesex UB8 3PH, United Kingdom.
4. Professor, Centre of Materials and Building Technologies, Univ. of Beira Interior, Covilhã 6200, Portugal.