Journal of Korean Society of Disaster and Security (한국방재안전학회논문집)

Korean Society of Disaster & Security (한국방재안전학회)
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Performance Evaluation of Quality-Improved Recycled Aggregate Using Ultrasonic Wave and Chemical Neutralization Reaction

초음파 세척 및 화학적 중화반응을 이용한 품질 개선된 순환골재의 성능 평가

  • Jay Jang-Ho Kim (School of Civil and Environmental Engineering, Yonsei University) ;
  • Young-Jun You (Department of Structural Engineering Research, Korea Institute of Civil Engineering and Building Technology)
  • 김장호 (연세대학교 건설환경공학과) ;
  • 유영준 (한국건설기술연구원 구조연구본부)
  • Received : 2024.02.01
  • Accepted : 2024.03.09
  • Published : 2024.03.31
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Abstract

This paper presents experimental research results to evaluate the applicability of chemical neutralization reaction and ultrasonic wave to remove cement paste and mortar attached to the surface of recycled aggregate. In order to derive optimal ultrasonic cleaning efficiency and chemical neutralization reaction, experiments were conducted using variables such as ultrasonic frequency and type of chemical solution. As a result, the optimal frequency was found to be 24 kHz, and immersion in a 15% hydrochloric acid solution for 30 minutes of stimulation showed the highest efficiency. In addition, the specific gravity, absorption rate, and wear rate of the quality-improved recycled coarse aggregate were similar to those of general aggregate and were found to satisfy all KS F 2527 standards. Therefore, it is believed that the recycled aggregate whose quality has been improved through the method proposed in this study can be used for concrete.

본 논문은 순환골재 표면에 부착된 시멘트 페이스트 및 모르타르를 제거하는 데 있어 화학적 중화반응 및 초음파 세척의 적용 가능성을 평가하기 위한 실험적 연구 결과를 제시한다. 최적의 초음파 세척 효율 및 화학적 중화반응을 도출하기 위하여 초음파 진동수, 화학용액의 종류 등을 변수로 한 실험이 수행되었다. 그 결과 최적 진동수는 24 kHz로 나타났으며, 염산 15% 용액에 침지시킨 후 30분 가진하는 것이 최적 조건이라는 결론이 도출되었다. 또한, 품질 개선된 순환 굵은 골재의 비중, 흡수율, 마모율은 일반골재와 유사하며 KS F 2527 기준을 모두 만족하는 것으로 나타났다. 따라서, 본 연구를 통해 제안된 방법을 통해 품질 개선된 순환골재는 콘크리트용으로 사용이 가능할 것으로 판단된다.

Keywords

Acknowledgement

This research was supported by an internal grant (code: 20230415-001) from the Korea Institute of Civil Engineering and Building Technology (KICT), Republic of Korea.

References

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