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Research Paper | Civil Engineering | Nigeria | Volume 12 Issue 6, June 2023

Locally Manufactured Steel Reinforcing Bars Used in the Nigerian Construction Industry

Boku-Oriseh Ogheneyole Precious | Prof. J.O Onyeka

Abstract: The research focused on the yield strength of locally manufactured high tensile steel reinforcement bars (12mm and 16mm) produced and used in Nigeria. The high tensile steel samples were purchased from the famous Building market at mile4 Porthar court, Rivers state. A total of forty samples were prepared for testing. These samples were made up of products from seven different companies. Some of the companies had both 12mm and 16mm bars while others had either 12mm or 16mm. Each company had a total of four samples for each diameter (12mm and 16mm). The study investigated the physical and mechanical properties of these steel bars and compared the results obtained with the British standard code of practice (BS4449:1997). From the tensile strength results of the samples tested, none of the samples conformed to the BS4449:1997 code of practice. The 12mm high yield steel bars the highest mean yield strength was 327.95N/mm2 and the 16mm high yield steel bars the highest mean yield strength was 401.85N/mm2. All the steel samples had varying minimum percentage elongation. The 12mm high tensile steel bars did not satisfy the required 12% minimum percentage elongation in the BS4449:1997 code. On the other hand,60% of the 16mm bars met the minimum required12% minimum percentage elongation to satisfy the BS4449:1997. In conclusion, it is necessary to re-examine the strength of steels obtained from Nigeria before using them.

Keywords: High Tensile steel bars, Strength. Physical and Mechanical Properties

Edition: Volume 12 Issue 6, June 2023,

Pages: 2656 - 2661