Verification of Properties of Concrete Reinforcement Bars: Nigeria as Case Study

Abstract

An investigation was conducted into the level of conformance of ribbed steel bars used in Nigeria's structural concrete practice to relevant international and local provisions. In this research, all bars imported into Nigeria from member countries of ISO as well as bars
marked with the identity of the local producing mill are classified as steel of recognizable origin. On the other hand, bars imported from ISO non-member countries as well as those without identifying mark of the producing works are classified as steel of non-recognizable
origin. The results of the investigation showed that steel of recognizable origin satisfy both local and ISO requirements for strength and ductility. On the other hand, steel of non-recognizable origin failed to satisfy the above requirements for high-yield ribbed
bars but satisfies the local specifications if used as mild steel.

Keywords: Ribbed steel bar, Strength, Ductility, Recognizable, Tensile test

African Research Review Vol. 2 (2) 2008 pp. 234-252