한국농공학회논문집 (Journal of The Korean Society of Agricultural Engineers)

  • 제62권2호
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  • Pages.31-38
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  • 2020
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  • 1738-3692(pISSN)
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  • 2093-7709(eISSN)
한국농공학회 (The Korean Society of Agricultural Engineers)
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비파괴 기법을 이용한 유동성 채움재의 초기경화특성 평가

Evaluation of Early-age Properties of Controlled Low Strength Material Using Non-destructive Testing

  • Kim, Dong-Ju (School of Agricultural Civil & Bio-Industrial Engineering, Kyungpook National University) ;
  • Kim, Sang-Cheol (School of Agricultural Civil & Bio-Industrial Engineering, Kyungpook National University) ;
  • Han, WooJin (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Lee, Jong-Sub (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Byun, Yong-Hoon (School of Agricultural Civil & Bio-Industrial Engineering, Kyungpook National University)
  • 투고 : 2019.10.29
  • 심사 : 2020.02.21
  • 발행 : 2020.03.31
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초록

Controlled Low Strength Material (CLSM) has high fluidity and self-compaction characteristics. CLSM is mainly used for backfilling the excavated road. Early-age properties of CLSM should be characterized for fast restoration of the road. In this study, shear wave monitoring and Vicat needle test are performed to investigate the early-age properties of CLSM depending on the setting time. CLSM consists of CSA cement, fly ash, silt and sand, accelerator, and water. Five fly ashes with different chemical properties are used for CLSM samples. The penetration of CLSM along setting time is obtained through the Vicat needle test. A pair of bender elements are placed in a mold for shear wave measurement, and the change in shear waves with the setting time is monitored. The experimental results show that, regardless of the type of fly ash, the penetration depth decreases and the shear wave velocity increases with the setting time. Depending on the type of fly ash, initial and final times and shear wave velocity change. After testing, the correlation between penetration and shear wave velocity is obtained with high coefficient of determination. The shear wave measurement technique using the bender element can be used to identify early-age properties.

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참고문헌

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