1. a Department of Civil Engineering, Faculty of Engineering, Accra Technical University, P.O. Box GP 561, Barnes Road, Accra, Ghana
2. b Department of Geological Engineering, University of Mines & Technology, P.O. Box 237, Tarkwa, Ghana
3. c Department of Building Technology, Faculty of Built Environment, Accra Technical University, P.O. Box GP 561, Barnes Road, Accra, Ghana