Abstract
Fiber-reinforced polymer (FRP) is an important material used for strengthening and retrofitting of reinforced concrete structures. Commonly used fibers are glass, carbon, and aramid fibers. The durability of structures can be extended by selecting an appropriate method of strengthening. FRP wrapping is one of the easiest methods for repair, retrofit, and maintenance of structural elements. Deterioration of structures may be due to moisture content, salt water, or contact with alkali solutions. Using FRP, additional strength can be gained by structural elements. This paper investigates the durability of aramid-fiber-wrapped concrete cube specimens subjected to acid attack and temperature rise. The study focuses on the durability of aramid-fiber-wrapped concrete by considering the compressive strength parameter of the concrete cube. Concrete cubes are prepared as specimens with a double wrapping of aramid fibers. Diluted hydrochloric acid solution is used for immersion of specimens for curing periods of 7, 30, and 70 days. The aramid-fiber wrapping reduces weight loss by 40% and improves compressive strength by 140%. In a fire resistance test, the specimens were kept in a hot air oven at a temperature of 200 °C at different time intervals. Even after fire attack, weight loss in specimens reduced by 60%, with about 150% enhancement in compressive strength due to aramid fiber.
Highlights
Fiber-reinforced polymers are extensively used in the strengthening and retrofitting of structurally deficient infrastructures
As Fiber-reinforced polymer (FRP) material is to be wrapped around concrete cubes, the surface characteristics of the concrete are very important in order to furnish proper bonds in the contact area
In the acid resistance test, weight loss can be reduced by about 26% to 40% using double-wrapped aramid fiber
Summary
Fiber-reinforced polymers are extensively used in the strengthening and retrofitting of structurally deficient infrastructures. Concrete is the most extensively used building material in the construction industry, but it faces some problems, such as damage from earthquakes and cracking due to shrinkage and expansion Due to these problems, concrete suffers from moisture attack, resulting in corrosion of steel reinforcement and loss of structural strength. Concrete suffers from moisture attack, resulting in corrosion of steel reinforcement and loss of structural strength Such damage can be repaired using FRP materials. Composites of FRP are manufactured from endless fibers (carbon, glass, and aramid) inserted in the matrix of thermosetting resins of epoxy, vinyl ester, or polyester. The resins bind these fibers together to transfer the load in between (Frigione et al [1]). FRP avoids chemical attack and temperature rises, reduces permeability, and improves strength
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