Quality Evaluation of Commercially Available Steels in Some Selected Nigerian Markets.

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dc.contributor.authorShuaib-Babata, Y. L.,
dc.contributor.authorAdewuyi, R .A.,
dc.contributor.authorAjao, K. S.,
dc.contributor.authorAmbali, I. O.,
dc.contributor.authorAremu, N. I.,
dc.contributor.authorIbrahim, H. K.
dc.contributor.authorAbdul, J. M.
dc.date.accessioned2021-10-12T10:37:04Z
dc.date.available2021-10-12T10:37:04Z
dc.date.issued2019-02-14
dc.description.abstractThe incessant building collapse and structural failures in Nigeria has renewed interests in the evaluation of the basic properties of reinforcing steel bars in Nigeria markets, since local markets serve as major source of supply for the steels used in construction and structural development. Thus, this study evaluated the quality of commercially available reinforcing steel bars in some selected markets with a view to determine their suitability for structural applications. Various steel bars samples were obtained from markets in four Nigeria cities. The basic physico-mechanical properties of the samples were examined and the obtained results were compared with the specified parameters in Nigerian Industrial Standard (NIS), ASTM and British Standards. Visual inspections revealed that most of the parameters that must to be indicated in identification marks on reinforcing steel bars were absent. Results also showed that the samples contained the basic chemical constituents of steel and possessed significant strengths and hardness values, but with noticeable inconsistencies in their contents. Thus, the level of compliance with the specified properties in the standards needs improvement. To avoid incessant structural failures in the country, regular and effective monitoring of the quality of steel bars in the markets for structural applications becomes imperative.en_US
dc.description.sponsorshipDr. Y. L. Shuaib-Babataen_US
dc.identifier.citationShuaib-Babata, Y. L., Adewuyi, R .A., Ajao, K. S., Ambali, I. O., Aremu, N. I., Ibrahim, H. K. & Abdul, J. M. (2019): Quality Evaluation of Commercially Available Steels in Some Selected Nigerian Markets. ANNALS of Faculty Engineering Hunedoara – International Journal of Engineering. Fersicule 2,Tome XVII; 103-114.en_US
dc.identifier.urihttp://annals.fih.upt.ro/ANNALS-2019-2.html
dc.identifier.urihttps://uilspace.unilorin.edu.ng/handle/20.500.12484/6566
dc.language.isoenen_US
dc.publisherPublished by University Politehnica Timisoara, Faculty of Engineering Hunedoara , 5, Revolutiei, 331128, Hunedoara, Romania.en_US
dc.relation.ispartofseriesFersicule 2,Tome XVII;103-114
dc.subjectcompliance to standardsen_US
dc.subjectsteel barsen_US
dc.subjectstrengthen_US
dc.subjectreinforcementen_US
dc.subjectstructural failuresen_US
dc.titleQuality Evaluation of Commercially Available Steels in Some Selected Nigerian Markets.en_US
dc.typeArticleen_US

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The steels in Nigeria markets had sizes within allowable range of nominal sizes as specified in Nigerian Industrial Standards. But, the available steels in the markets were of unknown source, since the required parameters in the identification marks were not provided. Meanwhile, there were wide variations in their carbon contents which call for proper analysis of the material before use for any structural development. Though, significant numbers of the steels in market had ductility values within the specified range in the standards. The study discovered inconsistencies in the values of elements in the steel samples, which may lead to inadequacies in the mechanical properties of the steel. Generally, the level of compliance to the specified properties in the standards was low, which requires much improvement. This is an indication of poor quality assurances on available commercial reinforcement bars in Nigeria, a major factor that might have been contributing to incessant structural failures in the country. There is need to put strategies in place by the regulatory bodies in Nigeria to effectively control in-flow of steel bars into the markets from un-identified sources. This calls for regular and effective inspection / monitoring of steels in the market to ensure adequate compliance with the specifications in the standards
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