eprintid: 1310
rev_number: 7
eprint_status: archive
userid: 7
dir: disk0/00/00/13/10
datestamp: 2025-01-09 21:08:31
lastmod: 2025-01-09 21:08:31
status_changed: 2025-01-09 21:08:31
type: article
metadata_visibility: show
creators_name: Adewuyi, Adekunle P.
creators_name: Eric, Gaolatlhe B.
title: Statistical Evaluation of the Geometric Properties Steel Bars for Reinforced Concrete in Botswana
ispublished: pub
subjects: TA
divisions: j6
full_text_status: public
keywords: Surface geometry, reinforcing bars, relative rib area, interfacial bonding, statistical indices, load carrying capacity.
abstract: Uncertainties in construction materials, especially steel reinforcing bars, have multiplying adverse impacts on the integrity and reliability of constructed facilities from construction to service life stages. Botswana depends on importation of rebars to meet the ever-increasing demands for buildings and reinforced concrete civil infrastructure. The study assessed the mass and geometric properties of the two most utilized steel reinforcing bars, designated as M1 and M2, in Botswana. With the aid of digital analytical balance and Vernier calipers, measurements of mass per unit length and the relative rib area (RRA), which depends on nominal diameter, rib height, rib spacing, and longitudinal rib or gap thickness were made from 3000 standard bars each of nominal sizes from 8 mm to 25 mm randomly sampled at the suppliers’ depots/warehouses and various construction sites in Gaborone and Francistown. The RRA is a measure of the surface geometry for interfacial bonding between steel reinforcing bar and the surrounding concrete. The geometric properties of each steel bar type of the nominal sizes were characterized in terms of the statistical parameters and compared for compliance with standard specifications such as CS2 (2012), ISO 15630, ACI A408. The actual mass and diameter of bars were within the tolerance of ± 1% of the respective nominal size which satisfied all the standard requirements. Only the 8 mm diameter M2 bars did not have longitudinal ribs/gaps. ACI specifies a range of 0.10 to 0.14 for RRA, while CS2/ISO 15630 only specifies for the minimum RRA values of 0.040 for 8 to 12 mm bars and 0.056 for 16 to 25 mm bars. M2 bars of 10 mm dia. bars did not satisfy CS2/ISO 15630 requirements. However, M1 (8 mm and 12 mm) and M2 (10, 16 and 25 mm) bar sizes are below the minimum and M2 bars of 20 mm diameter are above the recommended RRA values of ACI A408. These would reduce the load carrying capacity of RC members reinforced with the unsatisfactory bar sizes.
date: 2024-09-15
publication: Journal of Civil Engineering and Urbanism
volume: 14
number: 3s
publisher: Scienceline Publication
pagerange: 113–122
id_number: 10.54203/jceu.2024.10
refereed: TRUE
issn: 2252-0430
official_url: http://dx.doi.org/10.54203/jceu.2024.10
j_index: notindex
citation:    (2024)     Statistical Evaluation of the Geometric Properties Steel Bars for Reinforced Concrete in Botswana.   Journal of Civil Engineering and Urbanism.  113–122.  ISSN 2252-0430   
document_url: http://eprints.science-line.com/id/eprint/1310/1/JCEU14%283s%29113-122%2C2024.pdf