STUDY OF THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF STEEL REBARS LOCALLY PRODUCED IN GHANA

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Published: 2022-04-30

Page: 808-816


EBENEZER ANNAN

Department of Materials Science and Engineering, University of Ghana, School of Engineering Sciences, P.O. Box LG 77, Legon, Accra, Ghana.

LUCAS NANA WIREDU DAMOAH

Department of Materials Science and Engineering, University of Ghana, School of Engineering Sciences, P.O. Box LG 77, Legon, Accra, Ghana.

YAW DELALI BENSAH

Department of Materials Science and Engineering, University of Ghana, School of Engineering Sciences, P.O. Box LG 77, Legon, Accra, Ghana.

DAVID SASU KONADU *

Department of Materials Science and Engineering, University of Ghana, School of Engineering Sciences, P.O. Box LG 77, Legon, Accra, Ghana.

JONATHAN SELORM DEGBEZUI

Department of Materials Science and Engineering, University of Ghana, School of Engineering Sciences, P.O. Box LG 77, Legon, Accra, Ghana.

*Author to whom correspondence should be addressed.


Abstract

The structural integrity of engineered structures depends highly on the materials used. In recent times, increase in the collapse of buildings in Ghana has allegedly been attributed to the poor engineering properties of locally produced steel rebars, an indication that they do not meet the requirements set by the Ghana Standards Authority (GSA). This project studied the metallurgy of different rebars randomly sourced in Ghana, with a view to determine their suitability for structural applications. The study involved determining the chemical composition of the various diameters of rebars, analyzing microstructure and mechanical properties of the rebars and the obtained results compared with GSA values. The diameters measured gave average values which were close to that of the standard values. The chemical compositions of the rebars were good as they were all within the mild steel range but a few noticeable inconsistencies were observed in the chemical composition. The average tensile and yield strength for the samples were 545.11 MPa and 453.55 MPa which were above the GSA values of 400 MPa and 300 MPa minimum respectively. The rebars were quite ductile as standards for both elongation and area reduction were exceeded. This showed that the selected rebars met the GSA standards.

Keywords: Steel rebars, mechanical properties, microstructure, yield strength, mild steel


How to Cite

ANNAN, E., DAMOAH, L. N. W., BENSAH, Y. D., KONADU, D. S., & DEGBEZUI, J. S. (2022). STUDY OF THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF STEEL REBARS LOCALLY PRODUCED IN GHANA. Asian Journal of Advances in Research, 5(1), 808–816. Retrieved from https://mbimph.com/index.php/AJOAIR/article/view/2989

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References

Sund RB, Bishop J. Accent on science, C.E. Merrill Publishing Co.; 1980.

Frey PA, Reed GH. The Ubiquity of Iron, ACS Chem Biol. 2012;7(9):1477-1481.

Callister Jr.WD, Rethwisch DG. Materials Science and Engineering_ An Introduction, -John Wiley, 9th ed; 2014

Askeland DR, Fulay PP, Wright WJ. The Science and Engineering of Materials - Instructor’s Solutions Manual, Sci. Eng. Mater. 2005:1–126.

Groover MP. Fundamentals of Modern Manufacturing Materials, Processes, and Systems, John Wiley & Sons, INC, 4th ed; 2010.

Wang GC. Ferrous Metal Production and FerrousSlags in The Utilization of Slag in Civil Infrastructure Construction. Woodhead Publishing. 2016:9-33.

Yang Y, Raipala K, Holappa L. Ironmaking, in Treatise on Process Metallurgy, Volume. 2013;3:2–88.

Kalpakjain S, Schmid SR, Musa H. Manufacturing Engineering and Technology, Prentice Hall, Singapore. 2009;325-326. 6th Ed.

Ede A, Olofinnade M, Olofinade O, Joshua O. Experimental Investigation of Yield Strengths of Steel Reinforcing Bars Used in Nigerian Concrete Structures, Int. J. Sci. Eng. Res. 2014;5(4):76-83.

Bhardwaj BP. Handbook on Steel Bars, Wires, Tubes, Pipes, SS. Sheets Production with Ferrous Metal Casting & Processing. Delhi : Niir Project Consultancy Services; 2014.

Osei V. The Construction Industry and Its Linkages to the Ghanaian Economy-Polices To Improve the Sector’s Performance, Int. J. Dev. Econ. Sustain. 2013;1(1):56–72.

Kankam CK, Adom-Asamoah M. Strength and ductility characteristics of reinforcing steel bars milled from scrap metals, Materials and Design. 2002;23:537–545.

Tandoh JB, Amesimeku EK, Forson A, Nuviadenu C, Ahiamadjie H, Quashigah G, Gazoya E, Sackey-Lee H. Corrosion Behavior of Iron Steel Bars on the Ghanaian Market; Elemental Composition and Mechanical Properties Perspective Res. J. Appl. Sci. Eng. Technol. 2019;16(4):166–174.

Danso H, Boateng I. Is the Quality of Cement a Contributing Factor for Building Collapse in Ghana?, West African Built Environ. Res. Conf; 2013.

Hawkson EE. School Block collapses, kills 2 at Dzorwulu. Graphic Online, Accra; 2019. Available:https://www.graphic.com.gh/news/general-news/school-block-collapses-kills-2-at-dzorwulu.html

Adewuyi RA, Ajao KS, Ambli IO, Aremu NI, Ibrahim HK, Abdul JM. Quality Evaluation of Commercially Available Steels in Some Selected Nigerian Markets, ANNALS of Faculty Engineering Hunedoara – International Journal of Engineering. 2019;103–115.

Ghana Standards Authority. GS 788-2.Specification for Steel bars for Concrete Reinforcement; 2008.

Domfeh KA. Buyer Beware: iron rod standard could endanger your building Modern Ghana; 2012. Available:https://www.modernghana.com/news/405781/buyer-beware-iron-rod-standard-could-endanger-your-building.html

Zhou P, Jin-ming L, Zhang F, Hui-bin W, Di T. Influence of Chromium on Corrosion Behavior of Low-alloy Steel in Cargo Oil Tank O2-CO2-SO2-H2S Wet Gas Environment, J. Iron Steel Res. Int. 2015;22(7):630–637.

Guo-hua X, Han D, Mao-qiu W, Wei-jun H. Effect of Sulfur Content and Sulfide Shape on Fracture Ductility in Case Hardening Steel, J. Iron Steel Res. Int. 2011;18(8):58–64.

Mukherjee M, Pal TK. Role of Microstructural Constituents on Surface crack formation during hot rolling of standard and low nickel austenitic stainless steels, Acta Metall. Sin. (English Lett). 2013;26(2):206–216.

Davies RG. Influence of silicon and phosphorous on the mechanical properties of both ferrite and dual-phase steels. Metall. Trans. A. 1979;10(1):113–118.

kou He X, qiang Yang Z, Wang Z, bin Qiao S, dong Liu Z. Effect of Mn content on microstructure, tensile and impact properties of SA508Gr.4N steel for reactor pressure vessel. J. Iron Steel Res. Int. 2020;27(4):461–470.

British Standard (BS4449), Steel for the Reinforcement of Concrete – Weldable Reinforcing Steel - Bar, Coil and Decoiled Product – Specification; 2005.

Rao BN, Ashokkumar R. Effect of blow-holes on reliability of cast component,” Sadhana. 2008;33:733–751.

Solanki V, Mukhopadhyay G. Metallurgical analysis of transverse crack of rebars Eng. Fail. Anal. 2019;104:1143–1156.