Influence of High Temperatures on PET‐Concrete Properties

Abstract

Lightweight aggregate is an important material in reducing the unit weight of concrete and it is essential in the construction of high‐rise buildings; besides, the use of recycled PET bottles as lightweight aggregate in concrete is an effective contribution for environmental preservation. So, the objective of the present work is to study the flexural strength of PET‐concrete and PET thermal degradation in the concrete, when the blends with 10 and 20 vol% of PET are exposed to different temperatures (200, 400, 600 °C). The flexural strength of PET‐concrete exposed to a heat source is strongly dependent on the temperature, the water/cement ratio, as well as on the content and particle size of PET. Furthermore, the activation energy for PET degradation is affected by temperature, location of PET particles on the slabs and the water/cement ratio. A higher content of water gives rise to hydrolytic degradation on PET and a higher vapor pressure that increases the formation of cracks on the concrete. The values of activation energy are higher on the center of the slabs than on the surface, due to the poor heat conduction of concrete.

Chemically treated plastic replacing fine aggregate in structural concrete

“…The minor changes in flexural strength were accredited to the elastic behavior of the PW (Hannawi et al, 2010). Albano et al Albano et al (2009) observed that the enclosure of PET in concrete decreased the splitting tensile strength owing to the increase in the porosity. Abdel Moti, H. M., and Mustafa, M. A. Abdel Moti and Mustafa (2019) Stated that the splitting tensile strength was reduced by 10.15% and 14.03% for the 5% and 10% respectively compared to the control mix.…”

“…Consequently, discovering new alternatives is crucial to arise sustainability in the construction industry. Researchers studied the usage of wastes as replacements for concrete constituents (Albano et al, 2009), (Khalil and Mahdi, 2020). Reutilizing PW, especially resin-based types and PET, is a feasible substitute for natural sand.…”

“…This is in agreement with Jaivignesh, B., and Sofi, A Jaivignesh and Sofi (2017), who indicated that splitting tensile strength decreased by 19.8, 14.35, and 24.25% for 10, 15, and 20% of plastic waste replacement respectively at 28. In studying the consequence of PW on water absorption of concrete, Albano et al Albano et al (2009) revealed that the size and content of PET particles imitate the water absorption due to the porosity of PET. However, Frigione Frigione (2010) revealed that concrete enclosing minor percentages of PET have an insignificant effect on water absorption.…”

Investigation of the physical-mechanical properties and durability of high-strength concrete with recycled PET as a partial replacement for fine aggregates

“…However, the burning of other forms of waste such as PET will release toxic gases. So, recycling appears to be the safest path for compliance with the ecosystem and economic gains (Albano et al, 2009). As a result, the recycling rate will be improving, and demand for natural raw material production will decrease.…”

Acrylonitrile–butadiene rubber functionalization for the toughening modification of recycled poly(ethylene terephthalate)

“…Most recycled poly(ethylene terephthalate) (R‐PET) flakes (>70%) are converted into fibers by mechanical recycling . Also, many studies have been performed on the use of PET wastes in different applications, such as bottles, films, sheets, modified concrete, and industrial parts, by the application of different modifications, such as blending, and through the creation of composites and nanocomposites . However, PET is a notch‐sensitive thermoplastic with a low impact strength that decreases during physical aging.…”