Title: Multi-criteria analysis of impact strength in concrete with PET bottle waste additives

Authors: Sudhir Bhaskarrao Gayake; Shubham V. Jadhav; Saiprasad G. Gaikwad; Rushikesh S. Kasar; Pravin R. Parhe; Atul K. Desai

Addresses: Department of Civil Engineering, Sardar Vallabhbhai National Institute of Technology, Surat 395007, India; Department of Structural Engineering, Sanjivani College of Engineering, Savitribai Phule Pune University, Kopargaon 423603, India ' Department of Structural Engineering, Sanjivani College of Engineering, Savitribai Phule Pune University, Kopargaon 423603, India ' Department of Structural Engineering, Sanjivani College of Engineering, Savitribai Phule Pune University, Kopargaon 423603, India ' Department of Structural Engineering, Sanjivani College of Engineering, Savitribai Phule Pune University, Kopargaon 423603, India ' Department of Structural Engineering, Sanjivani College of Engineering, Savitribai Phule Pune University, Kopargaon 423603, India ' Department of Civil Engineering, Sardar Vallabhbhai National Institute of Technology, Surat 395007, India

Abstract: This study investigated the impact strength properties of M25 grade concrete at both the initial and ultimate cracking stages after incorporating waste polyethylene terephthalate (PET) bottles as an additive. Various concrete mixes with PET waste components, such as fibres, caps, cap rings, and labels, were tested at different percentages (1%, 2%, and 3% by volume of cement). To identify the optimal mixture for impact strength and explore alternative options, the analytical hierarchy process (AHP), a multi-criteria decision-making tool, was employed. The results demonstrated significant improvements in impact strength with the inclusion of PET fibres and cap rings, while PET caps and labels contributed only marginally to the enhancement. The optimal mixture was achieved with a 2% addition of PET fibres (3 mm × 60 mm), as larger fibres led to matrix debonding. The AHP tool effectively identified the best mix, consistent with the experimental findings. This study highlights the potential of using PET waste in concrete to promote sustainable production while maintaining structural integrity.

Keywords: impact strength properties; drop hammer test; PET waste; decision making; MCDM; AHP.

DOI: 10.1504/IJSTRUCTE.2025.144371

International Journal of Structural Engineering, 2025 Vol.15 No.1, pp.69 - 87

Received: 22 Jul 2024
Accepted: 03 Dec 2024
Published online: 10 Feb 2025 *