Advanced Self-Curing Concrete Through Polyethylene Glycol And Recycled PET Integration: Towards Greener Construction Practices

Abstract

This research presents an experimental investigation into the development and performance evaluation of self-curing concrete using Polyethylene Glycol (PEG 400) as a self-curing agent and Polyethylene Terephthalate (PET) fibers as reinforcement. The objective was to enhance the internal curing capability and sustainability of concrete, especially in regions where conventional curing practices are impractical. PEG was incorporated at varying dosages (0.5%, 1.0%, and 1.5% by weight of cement), while PET was maintained at a constant 2% by volume to assess the composite effect on the mechanical and durability characteristics of M25 grade concrete.

Comprehensive laboratory testing was conducted on specimens to determine compressive strength, split tensile strength, and flexural strength at 3, 7, and 28 days. Results indicated that the optimal performance was achieved at 1.0% PEG, which provided the highest strength across all tested parameters. The internal curing effect of PEG contributed to improved hydration, reduced shrinkage, and enhanced microstructural integrity, while PET fibers improved toughness and crack resistance. Higher PEG dosages beyond 1.0% resulted in slight reductions in strength, attributed to potential oversaturation and delayed hydration effects.

A detailed mix design was developed using IS 10262:2019 provisions, and a thorough analysis was performed to interpret results, identify trends, and establish implications for practice. The study also addressed the sustainability aspect by incorporating PET as a recycled material, aligning with environmental and waste management goals.

The findings advocate the use of PEG 400 at 1.0% dosage in combination with PET fibers as an effective and eco-friendly solution for internal curing in concrete. This innovation offers substantial potential for application in precast structures, arid-zone construction, and sustainable infrastructure development. Recommendations are made for future studies on durability, microstructural analysis, and long-term performance under varied environmental conditions.