1. Researcher, The Univ. of Sheffield, Dept. of Civil and Structural Engineering, Sir Frederick Mappin Building, Mappin Street, Sheffield S1 3JD UK; currently, Assistant Professor, Dept. of Structural Engineering, Ain Shams Univ., Cairo, Egypt.
2. Reader, The Univ. of Sheffield, Dept. of Civil and Structural Engineering, Sir Frederick Mappin Building, Mappin St., Sheffield S1 3JD UK.
3. Professor, Pro-vice Chancellor, The Univ. of Sheffield, Dept. of Civil and Structural Engineering, Centre for Cement and Concrete, Mappin Street, Sheffield, S1 3JD, UK.