KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
권호 표지
DOI QR코드

DOI QR Code

Effect of Moisture Conditions and Curing Conditions of Recycled Coarse Aggregate on Concrete Compressive Strength

재생 굵은 골재의 함수조건과 양생조건이 콘크리트 압축 강도에 미치는 영향

  • Received : 2024.01.03
  • Accepted : 2024.03.07
  • Published : 2024.06.01
Download PDF
⟨ Previous Next ⟩

Abstract

Currently, the quality standards for recycled aggregates in Korea are very high, at almost the same level as natural aggregates, so recycled aggregates cannot be widely used for concrete. In particular, it is necessary to evaluate how the moisture conditions and curing conditions of recycled aggregates with high absorption rates and wearing rates affect the compressive strength of concrete. Therefore, in this study, we wanted to investigate the effects on compressive strength through experiments using the moisture conditions and curing conditions of recycled coarse aggregate as variables, and compare the compressive strength characteristics of natural coarse aggregate concrete. As a result of this experimental study, the effect of compressive strength on concrete using recycled coarse aggregates according to curing conditions was similar to that of natural aggregate concrete, and the compressive strength showed a low strength of about 13 to 17 %. The effect of the moisture conditions of recycled coarse aggregates was that in the case of wet curing, concrete using wet aggregate showed slightly higher compressive strength than concrete using dry aggregate, but in the case of air curing, on the contrary, dry recycled aggregate concrete was relatively higher than wet aggregate concrete.

현재 우리나라의 순환골재의 품질기준은 천연골재와 거의 동등한 수준으로 매우 높기 때문에 재생골재를 콘크리트용으로 널리 이용하지 못하는 실정이다. 특히, 높은 흡수율과 마모율을 가진 재생골재의 함수상태와 양생조건이 콘크리트의 압축 강도에 어떤 영향을 미치는지에 대한 평가가 필요하다. 따라서, 본 연구에서는 재생 굵은 골재의 함수상태와 양생조건을 변수로 하여 실험을 통하여 압축 강도에 대한 영향을 알아보고, 천연 굵은 골재 콘크리트의 압축 강도 특성과 비교하고자 하였다. 본 실험연구 결과 재생 굵은 골재를 사용한 콘크리트의 양생조건에 따른 압축 강도 영향은 천연골재 콘크리트와 비슷하였으며, 압축 강도는 약 13~17 % 낮게 나타났다. 재생 굵은 골재의 함수상태에 따른 영향은 습윤양생의 경우 습윤상태의 골재를 사용한 콘크리트가 건조상태의 골재를 사용한 콘크리트 보다 조금 높은 압축 강도를 보였으나, 대기양생의 경우는 이와 반대로 건조상태의 재생골재 콘크리트가 습윤상태의 콘크리트보다 상대적으로 높게 나타났다.

Keywords

References

  1. Bartlett, F. M. and MacGregor, J. G. (1994). "Effect of moisture condition on concrete core strengths." ACI Materials Journal, ACI, Vol. 91, No. 3, pp. 227-236, https://doi.org/10.14359/4328.
  2. Choi, M. K., Park, H. G., Kim, K. K., Jung, K. S., Jung, K. H. and Jung, S. J. (2005). "An experimental study on the strength characteristic of recycled concrete by curing method." Proc. of 2005 Korea Concrete Institute Conference, KCI, Vol. 17, No. 2, pp. 723-726 (in Korean).
  3. Choi, W. Y., Lee, S. H., Jun, C. S. and Kim, T. H. (2018). "A study on the strength properties and life cycle assessment of high strength concrete using recycled coarse aggregate." Journal of the Korean Recycled Construction Resources Institute, RCR, Vol. 6, No. 1, pp. 8-15, https://doi.org/10.14190/JRCR.2018.6.1.8 (in Korean).
  4. Kim, J. Y. and Kim, J. K. (2014). "Study on compressive strength properties of concrete under different curing conditions." Proc. of 2014 Korea Concrete Institute Conference, KCI, Vol. 26, No. 2, pp. 349-350 (in Korean).
  5. KS F 2502 (2019). Standard test method for sieve analysis of aggregates. Korea Standards Association(KSA), Seoul, Korea (in Korean).
  6. KS F 2503 (2019). Standard test method for sieve analysis of aggregates. Korea Standards Association(KSA), Seoul, Korea (in Korean).
  7. KS F 2505 (2017). Standard test method for sieve analysis of aggregates. Korea Standards Association(KSA), Seoul, Korea (in Korean).
  8. KS F 2405 (2022). Standard test method for sieve analysis of aggregates. Korea Standards Association(KSA), Seoul, Korea (in Korean).
  9. KS F 2422 (2022). Standard test method for sieve analysis of aggregates. Korea Standards Association(KSA), Seoul, Korea (in Korean).
  10. Lee, S. T., Choi, J. Y., Park, K. T., Seo, D. W. and You, Y. J. (2014). "Effect of steam curing on the properties of recycled aggregate concrete." Journal of the Korea Institute for Structural Maintenance and Inspection, KSMI, Vol. 18, No. 2, pp. 99-107, http://dx.doi.org/10.11112/jksmi.2014.18.2.099 (in Korean).
  11. Moon, K. T., Park, S. Y. and Kim, S. E. (2019). "Compressive strength of concrete due to moisture conditions of recycled coarse aggregates and curing conditions." Journal of the Korean Society of Civil Engineers, KSCE, Vol. 39, No. 4, pp. 485-492, https://doi.org/10.12652/Ksce.2019.39.4.0485 (in Korean).
  12. Neville, A. M. (1996). Properties of Concrete (4th ed.), John Wiley & Sons, U.S.A.
  13. Poon, C. S., Shui, Z. H., Lam, L., Fok, H. and Kou, S. C. (2004). "Influence of moisture states of natural and recycled aggregates on the slump and compressive strength of concrete." Cement and Concrete Research, CCR, Vol. 34, No. 1, pp. 31-36, https://doi.org/10.1016/S0008-8846(03)00186-8.
  14. Yang, K. H., Lee, J. S. and Chung, H. S. (2005). "The influence of moisture state of aggregates on the properties of recycled aggregate concretes." Journal of the Architectural Institute of Korea Structure & Construction, AIK, Vol. 21, No. 10, pp. 103-110 (in Korean).