الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Fiber reinforced polymer (FRP) reinforcing bars are generally thought to be an acceptable replacement to standard steel reinforcing bars in concrete construction where corrosion is a major concern for the structure’s long-term serviceability. Due to this property, engineers have been motivated to use FRP bars in concrete structural elements for a wide range of applications. High strength-to-weight ratios, electromagnetic transparency, and corrosion
resistance are only a few of the advantages. In this study, the deterioration of
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bond of all GFRP bar test specimens with concrete is compared to steel
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reinforcement of the same bar diameter and implanted length under
accelerated hostile environmental conditions (sulfate and chloride solution). The GFRP bars are handmade using local resources and raw materials. The main parameters were the bars’ surface enhancement (smooth surface, sand coating, and mechanical) exposed under two aggressive environmental conditions sulfate solution containing 4.0% sodium sulphate (Na2SO4) and 4.0% magnesium sulphate (MgSO4) and saline solution containing a 3% concentration of sodium chloride (NaCl)at room temperature for 60 days. The results reveal that the different surface treatments for the same nominal size GFRP rebars have a respectable effect on the bond of all GFRP bars with concrete exposed to aggressive environments, which enhances bond stress and modes of failure compared to specimens reinforced by steel bars
.Under Exposure to aggressive environments sulfates or chloride solution mechanical surface texture treatment for GFRP bars possess the highest bond strength with splitting failure mode. While bond strength of steel significantly declines when exposed to aggressive solutions of sulfate or chloride.
Keywords: Durability, Bond Strength, GFRP Bars, Surface enhancement, Pull Out and Aggressive environment.