Journal of Civil Engineering Vol 68 No 2

1 PUBLISHER South African Institution of Civil Engineering Block 19, Thornhill Office Park, Bekker Road, Vorna Valley, Midrand, South Africa Private Bag X200, Halfway House, 1685, South Africa Tel +27 11 805 5947 , Fax +27 11 805 5971 www.saice.org.za, civilinfo@saice.org.za EDITOR-IN-CHIEF Dr Peter Day Consultant, Jones & Wagener (Pty) Ltd Extraordinary Professor of Geotechnical Engineering Stellenbosch University day@jaws.co.za CO-EDITOR-IN-CHIEF Prof Gerhard Heymann University of Pretoria gerhard.heymann@up.ac.za MANAGING EDITOR Danielle Petterson journal@saice.org.za EDITORIAL ASSISTANT Lakhe Nxitywa journal@saice.org.za SUB-EDITORS Prof EP Kearsley University of Pretoria Prof CP Roth University of Pretoria Prof A Visser University of Pretoria Prof J Wium Stellenbosch University Prof M Zuidgeest University of Cape Town Prof J Smithers University of KwaZulu-Natal BALANCE OF THE JOURNAL EDITORIAL PANEL Prof Y Ballim University of the Witwatersrand Prof JA Boateng University of Pretoria Prof W Burdzik Retired from the University of Pretoria Prof N de Koker Stellenbosch University Prof J du Plessis Stellenbosch University Prof GC Fanourakis University of Johannesburg Dr T Gaspar Imperial College London Dr C Herold Umfula Wempilo Consulting Prof A Ilemobade University of the Witwatersrand Prof SW Jacobsz University of Pretoria Prof C MacRobert Stellenbosch University Dr O Nnene University of Cape Town Dr J van der Merwe University of Pretoria Prof M van Dijk University of Pretoria Prof G van Zijl Stellenbosch University Prof C Venter University of Pretoria Dr E Vorster BEAL Group of Companies Prof R Walls Stellenbosch University Prof A Zingoni University of Cape Town PEER REVIEWING / OPEN ACCESS The Journal of the South African Institution of Civil Engineering , which is distributed internationally, is a peer-reviewed, open-access journal licensed under a Creative Commons Attribution Licence (CC BY-NC-ND). Readers may therefore freely use and share the content as long as they credit the original creator and publisher, do not change the material in any way, and do not use it commercially. DESIGN AND REPRODUCTION Marketing Support Services, Ashlea Gardens, Pretoria The South African Institution of Civil Engineering accepts no responsibility for any statement made or opinion expressed in this publication. Consequently, nobody connected with the publication of this journal, in particular the proprietor, the publisher and the editors, will be liable for any loss or damage sustained by any reader as a result of his or her action upon any statement or opinion published in this journal. © South African Institution of Civil Engineering and the authors Creative Commons Attribution Licence Volume 68 No 2 June 2026 ISSN 1021-2019 (print) | ISSN 2309-8775 (online) CONTENTS 2 The development of a framework to register, grade, and assess contractors’ performance S Chiloane-Nwabueze, A Fitchett, A Glendinning 20 Comparative study on the influence of trajectory bucket geometry on energy dissipation downstream of ski-jump spillways K A Tessendorf, A Bosman 36 The application of building information modelling across the road project life cycle S Yunos, D Allopi 45 Optimising traffic flow at major intersections in East London’s CBD using quantum flow theory: A case study of Oxford Street S Magingxa, S Abejide, E Theron, Z Smith 55 Mechanical properties of tropical residual soils – recommended test procedures and evaluation C Meier, F Hörtkorn