Evaluation of polyethylene terephthalate in concrete

Abdul Manaf, Adib Fikri (2022) Evaluation of polyethylene terephthalate in concrete. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

In recent years, advances in concrete technology have led to the invention of new forms of sustainable concrete. To prevent contamination of land and water supplies, daily use of the massive number of plastic polymers normally followed by a significant volume of waste needs to be controlled. According to statistics provided by the Malaysian Department of National Solid Waste Management, plastic waste is the second largest of the total solid waste produced in Malaysia and one of the most successful methods of reducing plastic waste is to reuse plastic waste in concrete. Polyethylene Terephthalate (PET) has good properties that can innovate and improve concrete properties. The goals of this research are to determine the properties of PET fibre concrete due to percentages (0.5%, 1.0%, 1.5% and 2.0%) for fresh, hardened, and non-destructive testing (NDT) methods. Concrete samples were tested using NDT such as acoustic emission test, thermal conductivity test and ultrasonic pulse velocity test. The fibres were simply cut from PET plastic bottles. The length and width of recycled PET fibres were fixed at 25 mm and 5 mm, respectively. The specimens were tested on day 7 and day 28 after the concrete was mixed. Tests were performed a slump test, a compressive strength test, splitting strength test and a flexural strength test to assess the mechanical properties and the optimum percentage of PET fibres. From the data analysis, the highest compressive strength of 49.80 MPa was obtained by a concrete specimen containing 1.0% PET at the age of 28 days. The cylinder specimen contained 0.5% PET achieved the highest splitting tensile strength at 3.95 MPa. The presence of 1.5% PET for specimens aged for 28 days had a signal strength of 9.5 × 108 pVs. Meanwhile, the maximum readings of absolute energy were obtained by specimens containing 1.5% of PET at 11.5 × 108 aJ. In addition, the highest amplitude value gained from this study is 99dB. From the UPV test, the highest velocity value is 4168m/s. The thermal conductivity value for specimens containing 1.0% of PET is 0.56 W/mK. From the RA value analysis, it can be concluded that the concrete specimen failed through tensile cracking. Meanwhile, the highest signal strength and absolute energy prove that the specimens have better resistance towards cracking. Moreover, the RA value analysis is appropriate for concrete crack classification. Therefore, the AE technique is found to be suitable for crack evaluation and monitoring methods.

Item Type:	Thesis (Masters)
Subjects:	T Technology > T Technology (General)
Divisions:	Faculty of Civil Engineering and Built Environment > Department of Civil Engineering : Building and Construction Engineering
Depositing User:	Mrs. Sabarina Che Mat
Date Deposited:	07 Feb 2023 03:36
Last Modified:	07 Feb 2023 03:36
URI:	http://eprints.uthm.edu.my/id/eprint/8247

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