Abstract
Externally bonded reinforcement using Fiber Reinforced Polymer (FRP) is a good response to the concern represented by the need for rehabilitation of concrete structures. These techniques are more and more attractive because of their fast and low labour costs, very good strength to weight ratio, good fatigue properties, and non-corrosive characteristics of FRP. The present work is an experimental study investigating the mechanical behaviour under a uni-axial loading of short concrete columns reinforced by composite materials. These are constituted of glass fibers GFRP (bidirectional fabric of two surface densities 500 and 300 g/m2), carbon CFRP (unidirectional sheet of density per unit area of 230 g/m2) and polyester and epoxy resin respectively. The investigation aims at demonstrating the effectiveness of FRP reinforcement through highlighting the effect of thickness (FRP number of folds), the nature of the reinforcement (glass, carbon or Hybrid), and the orientation of the fibers. The axial lengths shortening along with the radial expansion are measured using the strain gauges glued to the outer surfaces of the composite jacket via a Wheatstone bridge. These measurements are saved to a PC through an acquisition card. The results obtained clearly show that the columns reinforced with CFRP folds allow an important increase in the compressive rupture stress in comparison with those reinforced with GFRP folds. The gains in compressive strength, in axial and in radial strains of the confined concrete with the different FRPs used are identified and quantified. It has further been demonstrated that the tested columns mechanisms depend strongly on the type of fiber reinforcements.
Highlights
The durability of reinforced concrete structures depends on their behavior in relation to the climatic and environmental conditions that exist in the environments in which they are constructed
According to the study of externally wrapped concrete columns subjected to uni-axial compression loading the main conclusions are:
The columns confined by the Glass fiber reinforced polymer (GFRP) and CFRP composite subjected to a repetitive loadings, showed a more rigid compared to the concrete control;
Summary
The durability of reinforced concrete structures depends on their behavior in relation to the climatic and environmental conditions that exist in the environments in which they are constructed These structures are often exposed to numerous physico-chemical aggressions which they must satisfy, during their period of use, all the functions for which they were designed. When they can no longer resist these aggressions, disorders appear in the concrete of these structures These disorders are generally due to design flaws, poor implementation or accidental causes, but these disorders can be due to non-compliance with quality standards in manufacturing by certain companies. These behaviors, if not rectified, undermine the durability, resistance and stability of the structures and can lead to their degradation and their ruin (Ndzana Akongo, 2007). From military applications in the 1940s to the manufacturing and industrial sectors in the 1950s, FRP composites have gradually become the preferred alternative to traditional repair techniques
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