Since the first introduction of plastics, the issue of recycling has been repeatedly discussed. Plastics with limited biodegradability accumulate in the soil and ocean when deposited in landfills, causing environmental problems, and when incinerated emit a large amount of carbon. In particular, polyethylene terephthalate (PET) is now an indispensable material in daily life, and the waste it generates is also significant. In response, we sought a way to use PET waste as a concrete additive. Typically, adding PET damages the physical strength of concrete, and to solve this problem, gamma ray irradiation was first applied to the PET. The overall peak intensity of the fourier transform infrared spectroscopy (FT-IR) absorption spectrum of gamma-ray-irradiated PET increased, and the surface hydrophilicity of the material increased. In addition, it was confirmed that surface roughness increased when PET was irradiated with gamma rays. The strength of concrete mixed with gamma-irradiated PET was measured, and the compressive strength increased compared to concrete mixed with non-gamma-irradiated PET, and in the case of fibrous PET, the flexural strength increased.

Abstract
1. 서 론
2. 실험 방법
3. 결과 및 고찰
4. 결 론
References
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• 강지존(전북대학교 건축공학과) | Jijon Kang (Department of Architectural Engineering, Jeonbuk National University, Jeonju 54905, Republic of Korea)
• 소승영(전북대학교 건축공학과, 전북대학교 공업기술연구센터) | 전북대학교 공업기술연구센터 (Department of Architectural Engineering, Jeonbuk National University, Jeonju 54905, Republic of Korea, Research Center for Industrial Technology (RCIT), Jeonbuk National University, Jeonju 54920, Republic of Korea) Corresponding author