Keywords

Abstract

Self compacting concrete; 

High density polyethylene;

 Polypropylene; Durability; 

Scanned electron microscope; 

Fourier transform infrared spectroscopy

This study focuses on creating an eco-friendly self-compacting concrete (EF-SCC) by recycling waste materials like plastic and construction debris. The researchers collected High-Density Polyethylene (HDPE) and Polypropylene (PP) plastics, cleaned and shredded them, then used them to partially replace fine sand at different levels, from 5% up to 20%. They also replaced all the traditional coarse rock aggregate with recycled materials from construction waste. The concrete’s flow and ease of pouring (workability) were tested, and it was found that mixes with recycled aggregates flowed faster, with the best result being a 6-second flow time when using 10% HDPE. Durability tests were done by exposing the concrete to acid and sulphate attacks over several weeks, showing that the recycled concrete with plastics held up well, with only minor weight loss after 56 days in acid. Thermal tests showed that adding plastic lowered the concrete’s heat conductivity by 30-35%, making it better at insulating. Microscopic analysis showed that the plastic was well integrated with the cement mixture, and chemical tests confirmed there were no harmful reactions between the plastic and the cement. Overall, the study suggests that EF-SCC made with recycled aggregates and plastic waste can keep key properties needed for construction, making it a promising, sustainable building material.

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