APPRAISAL OF REINFORCING STEEL RODS MARKETED IN A MAJOR BUILDING MATERIALS MARKET IN ENUGU STATE

ODINAKACHUKWU FIDELIS OBI (NAU/2016224025)

Abstract


This research entitled “Appraisal of Reinforcing Steel Bars Marketed in Major Building Materials Market in Enugu State” was undertaken to find out the characteristic properties of the reinforcing steel bars used in the Nigerian Construction Industry and marketed in Enugu State. The study investigated the yield strength, ultimate tensile strength, characteristic strength and percentage elongation of different sizes of steel bars of five different companies in relation to their level of conformity with the specified parameters in British Standard codes (BS) and Nigerian Industrial Standard (NIS) code. Thirty samples of reinforcing steel bars of 5 companies were used in the experiment. It was found that the samples tested fell short of expectations of BS4449:1997 and NIS 117:2004 while the corresponding percentage elongation was satisfactory.Only 20% and 50% of the tested bar samples met the Nigerian Industrial Standard code minimum requirements for yield strength and ultimate tensile strength respectively. That is an average of 438.30N/mm2 yield strength and 551.50N/mm2 ultimate tensile strength. It is therefore established that the bars have performed below expectations in ductility implying they can fail without warning and therefore the design strength employed using such reinforcement ishazardous.

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