Assessing the efficacy of Polyethylene Terephthalate (PET) in concrete brick for sustainable construction

This paper presents the results of an experimental study investigating the effects of incorporating Polyethylene Terephthalate (PET) into concrete bricks on their compressive strength and water absorption. A total of 120 samples were produced and subjected to water curing for periods of 7, 14 and 28 days to monitor the development of compressive strength. Each parameter was tested on three brick samples to ensure accuracy and obtain average values. PET was added as a plastic aggregate at four different percentages which are 2.5%, 5%, 7.5% and 10% with a corresponding reduction in fine aggregate. The results showed that the inclusion of 5% PET yielded the highest compressive strength. Meanwhile, bricks containing 10% PET demonstrated the lowest water absorption. The 28 days curing period was found to be the most effective for enhancing compressive strength as it allows for more complete cement hydration.