Marine reinforced concrete structures are continuously exposed to aggressive environmental conditions such as chloride ingress, seawater immersion, wetting–drying cycles, and high humidity, which accelerate the deterioration of conventional steel reinforcement through corrosion. This study investigates the durability performance of Glass Fiber Reinforced Polymer (GFRP)-reinforced M40 concrete as a corrosion-resistant alternative for sustainable marine infrastructure. An experimental program was conducted using GFRP-reinforced concrete specimens subjected to accelerated marine exposure in a 3.5% sodium chloride (NaCl) solution with cyclic wetting and drying for 0, 3, 6, 9, and 12 months. The results revealed that after 12 months of exposure, compressive strength retained 93.7%, bond strength retained 89.2%, split tensile strength retained 92.6%, and flexural strength retained 92.8% of their original values. RCPT values increased slightly from 620 to 782 Coulombs but remained within the "Very Low" chloride permeability category. Water absorption increased from 2.34% to 2.93%, while carbonation depth remained limited at 2.4 mm. SEM observations showed only minor pore development, EDS confirmed the absence of iron corrosion products, and XRD demonstrated mineralogical changes without compromising structural integrity.
Glass Fiber Reinforced Polymer (GFRP), Marine Structures, Corrosion Resistance, Reinforced Concrete.
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