Optimization of Fiber-Reinforced Polymer (FRP) Wrapping for Corrosion-Damaged Reinforced Concrete Beams in Plateau State, Nigeria
Abstract
Reinforced-concrete infrastructure in Plateau State, Nigeria, is increasingly distressed by chloride- and carbonation-induced corrosion exacerbated by the region’s cool–wet monsoon climate and widespread use of de-icing salts in the Jos-Bukuru metropolis. This study investigated the optimum configuration of externally-bonded carbon FRP (CFRP) and glass FRP (GFRP) wraps for restoring flexural capacity of 20 naturally-corroded beams salvaged from a collapsed shopping complex in Rayfield, Jos South. A two-stage experimental programme—Phase I: rapid electrochemical chloride extraction (ECE) followed by Phase II: wet lay-up FRP wrapping—was adopted. Variables included FRP type (CFRP vs. GFRP), number of plies (1, 2, 3), fiber orientation (0°/90° vs. ±45°), and surface preparation level (wire-brushed vs. grit-blasted). Ultimate load, deflection, and failure mode were measured under four-point bending to BS EN 12390-5 (2019). Results revealed that two plies of 0°/90° CFRP applied after grit-blasting and ECE restored 96 % of the original flexural capacity, whereas equivalent GFRP achieved 88 %. Conversely, ±45° orientation maximised ductility (?u/?y = 3.8) but only regained 79 % strength. A response-surface model (R² = 0.94) identified “number of plies” (? = 0.61) and “surface roughness” (? = 0.23) as the most influential parameters. Cost–benefit analysis indicated CFRP wrapping at 60 % of replacement cost for a 25-year extended service life. The study provides a field-ready protocol for rehabilitating corrosion-damaged RC members in Plateau State and similar tropical highland regions.
Keywords
FRP wrapping; corrosion; reinforced concrete; plate bonding.
Citations
IRE Journals:
Jingnap Princewill Selnan , Akpan Boniface Ekarika , Tolulope Dorcas Mobolade-Solomon
"Optimization of Fiber-Reinforced Polymer (FRP) Wrapping for Corrosion-Damaged Reinforced Concrete Beams in Plateau State, Nigeria" Iconic Research And Engineering Journals Volume 9 Issue 2 2025 Page 1090-1099
IEEE:
Jingnap Princewill Selnan , Akpan Boniface Ekarika , Tolulope Dorcas Mobolade-Solomon
"Optimization of Fiber-Reinforced Polymer (FRP) Wrapping for Corrosion-Damaged Reinforced Concrete Beams in Plateau State, Nigeria" Iconic Research And Engineering Journals, 9(2)
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