Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
권호 표지
DOI QR코드

DOI QR Code

Evaluation Method of Healing Performance of Self-Healing Materials Based on Equivalent Crack Width

등가균열폭에 기반한 자기치유 재료의 치유성능 평가 방법

  • Lee, Woong-Jong (Research Center, Korea Concrete Institute) ;
  • Kim, Hyung-Suk (Department of Civil, Architectural and Environmental System Engineering, Sungkyunkwan University) ;
  • Choi, Sung (Department of Civil Engineering, Kyungdong University) ;
  • Park, Byung-Sun (Department of Environmental Systems Engineering, Sejong Campus, Korea University) ;
  • Lee, Kwang-Myong (Department of Civil, Architectural and Environmental System Engineering, Sungkyunkwan University)
  • 이웅종 (한국콘크리트학회 공학연구소) ;
  • 김형석 (성균관대학교 건설환경시스템공학과) ;
  • 최성 (경동대학교 토목공학과) ;
  • 박병선 (고려대학교 환경시스템공학과) ;
  • 이광명 (성균관대학교 건설환경시스템공학과)
  • Received : 2021.08.19
  • Accepted : 2021.09.13
  • Published : 2021.09.30
Download PDF
⟨ Previous Next ⟩

Abstract

In this study, constant head water permeability test was adopted to evaluate self-healing performance of mortars containing inorganic healing materials which consist of blast furnace slag, sodium sulfate and anhydrite. Clinker powder and sand replaced for a part of cement and fine aggregates. On constant head water permeability test for self-healing mortars, unit water flow rate of mortar specimens were measured according to crack width and healing period. As a result of evaluating the healing performance of self-healing mortar, it was confirmed that with the initial crack width of 0.3mm, the healing rate at healing period of 28 days increased by more than 30%p compared to plain mortar, greatly improving the healing performance. Furthermore, the coefficient(α) which was estimated from the relationship between crack width and unit water flow rate was used for calculating equivalent crack width. By analyzing the correlation of healing rate and equivalent crack width, the time and initial crack width attaining healing target crack width were predicted.

본 연구에서는 정수위 투수시험을 통하여 무기계 치유소재를 사용한 자기치유 모르타르의 치유성능을 평가하였다. 자기치유 모르타르의 제조를 위해 무기계 소재로 고로슬래그 미분말, 황산나트륨, 무수석고를 사용하였으며, 시멘트 클링커 분말과 클링커 잔골재를 시멘트와 잔골재를 각각 대체하여 사용하였다. 정수위 투수시험을 수행하여 균열폭과 치유재령 경과에 따른 단위유출 수량을 측정하였다. 자기치유 모르타르의 치유성능평가 결과 Plain 모르타르와 비교하여 치유재령 28일에서 초기 균열폭이 0.3mm인 경우 치유율이 30%p 이상 증가하여 치유성능이 크게 증진된 것을 확인하였다. 또한, 투수시험결과로부터 얻은 상수(α)를 이용하여 치유재령 경과에 따른 등가균열폭을 산출하였으며, 등가균열폭과 치유율의 상관관계 분석을 통해 치유 목표균열폭을 만족하기 위한 초기 균열폭과 도달시기를 예측하였다.

Keywords

Acknowledgement

본 연구는 국토교통부 건설기술연구사업의 연구비지원(21SCIP-C160254-02)에 의해 수행되었습니다.

References

  1. Choi, S.W., Bae, W.H., Lee, K.M., Shin, K.J. (2017). Correlation between crack width and water flow of cracked mortar specimens measured by constant water head permeability test, Journal of the Korea Concrete Institute, 29(3), 267-273 [in Korean]. https://doi.org/10.4334/JKCI.2017.29.3.267
  2. Edvardsen, C. (1999). Water permeability and autogenous healing of cracks in concrete, ACI Materials Journal, 96(4), 448-454.
  3. Ferrara, L., Van Mullem, T., Alonso, M.C., Antonaci, P., Borg, R.P., Cuenca, E., ...De Belie, N. (2018). Experimental characterization of the self-healing capacity of cement based materials and its effects on the material performance : A state of the art report by COST Action SARCOS WG2, Construction and Building Materials, 167, 115-142. https://doi.org/10.1016/j.conbuildmat.2018.01.143
  4. Korea Concrete Institute (2021). Constant Water Head Permeability Test Method for the Evaluation of Self-Healing Performance of Mortar, KCI-CT114.
  5. Lee, K.M., Kim, H.S., Lee, D.K., Shin, K.J. (2021). Self-healing performance evaluation of concrete incorporating inorganic materials based on a water permeability test, Materials, 14(12), 1-17.
  6. Lee, K.M., Kim, H.S., Min, K.S., Choi, S. (2020). Evaluation method of self-healing performance of cement composites, Journal of the Korean Recycled Construction Resources Institute, 8(1), 134-142 [in Korean]. https://doi.org/10.14190/JRCR.2020.8.1.134
  7. Moon, K.D., Choi, Y.C. (2015). Hydration of high-volume GGBFS cement with anhydrite and sodium sulfate, Journal of the Korea Concrete Institute, 27(2), 177-184. https://doi.org/10.4334/JKCI.2015.27.2.177
  8. Shin, K.J., Bae, W.H., Choi, S.W., Son, M.W., Lee, K.M. (2017). Parameters influencing water permeability coefficient of cracked concrete specimens, Construction and Building Materials, 151, 907-915. https://doi.org/10.1016/j.conbuildmat.2017.06.093