DOI QR코드

DOI QR Code

콘크리트 단면복구용 보수재료의 굵은 골재 최대치수 및 조립률에 따른 재료적 특성

Material Properties Depending on the Maximum Aggregate Size and Fineness Modulus for Concrete Repair Materials

  • 이선목 ((주)정우소재 기술영업부) ;
  • 이병재 (대전대학교 토목환경공학과) ;
  • 김윤용 (충남대학교 토목공학과)
  • 투고 : 2023.11.01
  • 심사 : 2023.11.08
  • 발행 : 2023.12.31

초록

본 연구에서는 보수재료에 굵은 골재를 사용하게 되면서 얻을 수 있는 효과를 검토하기 위해 굵은 골재의 최대치수 및 조립률을 다양화 하면서 콘크리트의 특성을 파악하는 기초 연구를 수행하였다. 그 결과 콘크리트의 슬럼프는 굵은 골재 최대치수가 커질수록 증가하였고, 공기량은 최대 골재 치수가 10 mm 이상인 배합군에 비해 최대 골재 치수가 5 mm 의 골재를 사용한 배합에서 공기량이 1.88~2.35 배 높게 측정되었다. 압축강도는 굵은 골재의 실적률에 많은 영향을 받는 것으로 나타났다. 실적률이 가장 높은 최대치수 20 mm 의 굵은 골재를 사용한 배합에서 압축강도가 가장 높게 측정되었으며 실적률이 가장 낮은 배합의 압축강도보다 45% 이상 높게 나타났다. 건조수축 측정결과 굵은 골재 최대치수 및 조립률의 변화에 따라 굵은 골재의 실적률이 높아지면서 건조 수축이 가장 낮게 측정되었고, 실적률이 가장 낮은 배합에서 가장 크게 나타났다. 본 연구를 통해 콘크리트 구조물 보수용 재료에 사용되는 굵은 골재의 최대치수 및 조립률을 다양화해서 입도를 조정하게 되면 강도 및 작업성이 우수해지고 건조수축을 줄일 수 있는 것을 확인 할 수 있었다.

Re-damage is frequently occurring for various reasons, including material factors, external factors, and factors caused by poor construction in concrete cross-section restoration work, so it is necessary to identify the cause and improve it. Cement-based materials are the most commonly used maintenance materials for concrete structures, and in particular, additional cross-sectional restoration work may be carried out due to re-damage such as cracks and excitement due to dry contraction of the repair material. In this study, a basic study was conducted to identify the characteristics of concrete while diversifying the maximum dimensions and assembly rate of thick aggregates to examine the effects of using thick aggregates in repair materials. As a result, the slump of concrete increased as the maximum size of thick aggregates increased, and the amount of air content was measured 1.88 to 2.35 times higher in the mixing using aggregates with a maximum aggregate size of 5 mm or more compared to the mixing group with a maximum aggregate size of 10 mm or more. It was found that compressive strength was greatly affected by the performance rate of thick aggregates. The compressive strength was measured the highest in the mixture using thick aggregates with the highest performance rate of 20 mm, and the compressive strength of the mixture with the lowest performance rate was more than 45%. As a result of the dry shrinkage measurement, the dry shrinkage was the lowest as the performance rate of the thick aggregate increased according to the change in the maximum dimensions and assembly rate of the thick aggregate, and the lowest performance rate was the largest in the mix. Through this study, it was confirmed that adjusting the particle size by diversifying the maximum dimensions and assembly rate of thick aggregates used in concrete structure repair materials can improve strength and workability and reduce dry shrinkage.

키워드

과제정보

본 논문은 국토교통부/국토교통과학기술진흥원의 지원으로 수행 되었습니다(과제번호RS-2022-00142566). 이에 감사드립니다.

참고문헌

  1. KSMI (2016), Sustainable Repair Reinforcement Technology for Concrete Structures, Kimundang, Rep. of Korea, 15-18.
  2. Jeong, Y. S., Min, G. H., Lee, I. K., Youn, I. R., and Kim, W. S. (2021), Comparative Study of Bridge Maintenance: United States, United Kingdom, Japan, and Korea, Journal of the Korea Institute for Structural Maintenance and Inspection. 25(5), 114-126 (in Korean).
  3. Oh, S. K. (2010), A Study on Guidelines for the Repair of Water Leakage Cracks in Concrete Structures, Journal of the Korea Institute of Building Construction, 10(6), 97-107 (in Korean). https://doi.org/10.5345/JKIC.2010.12.6.097
  4. Min, G. H., Lee, I. K., Jeong, Y. S., and Kim, W. S. (2021), Proposals for Enhancing Performance of Repair of Deteriorated Concrete Structures, Journal of the Korea Concrete Institute, 33(6), 579-587. https://doi.org/10.4334/JKCI.2021.33.6.579
  5. KECRI (2021), Performance Improvement of Concrete Repairs and Crack Repairs, Korea Expressway Corporation Research Institute (KECRI).
  6. KALIS (2019), A Study on the Preparation of Repair and Reinforcement Tips (Planning) for Facilities (Bridge, Tunnel, etc.). Jin-Ju, Korea Authority of Land & Infrastructure Safety (in Korean).
  7. Lee, I. K., Kim, K. K., Kim, H. S., Yun, S. H., and Kim W. S. (2023), Revision of Repair Materials Performance Requirement for Concrete Structures, Journal of Civil and Environmental Engineering Research, 43(1), 9-20 (in Korean).
  8. Lee, Y. O., and Yun, H. D. (2010), Effects of Expansive Admixture on the Mechanical Properties of Strain-Hardening Cement Composite (SHCC), Journal of the Korea Concrete Institute, 22(5), 617-624 (in Korean). https://doi.org/10.4334/JKCI.2010.22.5.617
  9. Choi, H. E., Choi, S. Y., Kim, I. S., and Yang, E. I. (2020), Characteristics of Shrinkage on Concrete using Electric Arc Furnace Slag as Coarse Aggregate, Journal of the Korea Institute for Structural Maintenance and Inspection, 24(1), 125-132 (in Korean).
  10. Jang, S. Y., Ryu, H. S., Yun, Y. S., and Kwon, S. J. (2017), Characteristics of Drying and Autogeneous Shrinkage in HPC with 65% Replacement of GGBFS. Journal of the Korea Institute for Structural Maintenance and Inspection. 21(3), 54-59 (in Korean).