Mechanical response of recycled carbon fiber reinforced polymer fibers in high-strength concrete

Abstract

The present paper studied the mechanical behavior of High Strength Concrete by incorporating recycled CFRP (Carbon Fiber Reinforced Polymer) fibers. The hardened properties of high-strength concrete were assessed using fiber volume fractions of 0.2 %, 0.4 %, 0.6 %, 0.8 %, and 1 % with a 30 mm average size of recycled chopped carbon fibers. The hardened properties of concrete test samples were evaluated using UPVT (Ultrasonic Pulse Velocity Test) and compressive strength test. Thirty-six specimens were tested at 28 days compressive strength to characterize mechanical properties. X-ray Diffraction analysis was carried out on a nominal mix test sample and a sample having an optimum dosage of fibers to characterize crystalline materials and understand the mineralogical properties of the concrete matrix. Analytical analysis was carried out using linear regression analysis for high-strength concrete's mechanical properties, considering different volume fractions or dosages of recycled chopped carbon fibers. The results showed that the increase in recycled chopped carbon fibers volume fractions or dosages enhances the compressive strength and increases the porosity of concrete samples up to the optimum dosage of recycled chopped carbon fibers.