Rehabilitation of overload-damaged reinforced concrete columns using ultra-high-performance fiber-reinforced concrete

Abstract One of the problems experienced by reinforced concrete (RC) structures, whether a mistake at design phase or change in building use, is an overload. The goal this study to determine ultra-high-performance fiber-reinforced (UHPFRC) effective repairing damaged columns utilizing 30 mm thin jacketing made different steel fibers various contents with varied aspect ratios (28, 37, and 45). Nine pieces 500 long RC column specimens cross-sectional size 150 × were cast as part experimental program. By loading these roughly 90% their actual ultimate axial load capacities, damage was caused, subsequently strengthened rebuilt using UHPFRC materials. results demonstrated that when fiber content increased, so did mechanical qualities, such compressive tensile strengths. Rehab materials contained 0.5% recovered 138% maximum load-bearing while 1.5% 164% original which 1.38–1.64 times unjacketed reference column. Additionally, it observed employing approaches resulted displacement being improved from 2.91 5.53 content, increase almost double control specimens.