1. Principal Lecturer, School of Engineering and the Built Environment, Univ. of Wolverhampton, Wulfruna St., Wolverhampton, WV1 1SB, U.K. E-mail: I.E.Ndekugri@wlv.ac.uk
2. Ph.D. Student, School of Engineering and the Built Environment, Univ. of Wolverhampton, Wulfruna St., Wolverhampton, WV1 1SB, U.K. E-mail: N.Braimah@wlv.ac.uk
3. Reader, School of Engineering and the Built Environment, Univ. of Wolverhampton, Wulfruna St., Wolverhampton, WV1 1SB, U.K. E-mail: N.Braimah@wlv.ac.uk