Investigations On The Practical Use Of Recycled Plastic In Concrete

Abstract

The incorporation of fibers into concrete offers a solution to enhance its flexural and tensile strength, addressing its inherent brittleness. However, the widespread use of plastics, particularly PET (Polyethylene terephthalate), has led to environmental concerns due to disposal challenges. This study explores the utilization of recycled PET fibers in concrete to improve its mechanical, structural, and durability properties. PET fibers enhance concrete's resistance to cracking, fatigue, shear, impact, and improve long-term ductility. Testing the tensile strength and morphology of PET fibers revealed their suitability for concrete reinforcement. Comparisons between PET fiber reinforced concrete and conventional concrete demonstrated improved behavior, with PET fibers exhibiting strength and ductility. However, increasing fiber volume fraction and aspect ratio reduced fiber-concrete bonding. Acid and sulfate attack tests showed that concrete with PET fibers exhibited better resistance to adverse environmental conditions due to lower water absorption. Additionally, PET fiber reinforced concrete demonstrated enhanced load-carrying and energy-absorbing capacity in beam and beam-column joint tests, especially with a fiber volume fraction of 1.5%. These findings suggest that PET fibers can serve as effective secondary reinforcement in concrete, contributing to its structural integrity and resilience.