DOI QR코드

DOI QR Code

Analysis on the Heat Insulation Performance of Cold Weather Concrete according to Change of Laid Construction Conditions of Double Bubble Sheets

이중버블시트의 포설 시공조건 변화에 따른 한중 콘크리트의 단열보온 성능 분석

  • Han, Cheon-Goo (Department of Architectural Engineering, Cheong-ju University) ;
  • Han, Min-Cheol (Department of Architectural Engineering, Cheong-ju University) ;
  • Baek, Dae-Hyun (Department of Architectural Engineering, Cheong-ju University)
  • Received : 2010.08.31
  • Accepted : 2010.10.06
  • Published : 2010.10.20

Abstract

The present research examined heat insulation performance according to change of various laid construction conditions of double bubble sheet being used as material for heat insulation & curing construction of cold weather concrete, and its results are as follows. First, the change in a laid period of bubble sheet within 4 hours and the change in water content inside bubble sheet overall showed similar temperature history and maturity without a big difference in terms of the temperature history of concrete according to construction factors, but it could be confirmed that when a structure was thin or several bubble sheets are laid, requisites unfavorable for initial curing of concrete can occur if a lagger distance between sheets is generated. In terms of the compressive strength of concrete core specimens, it appeared that the initial compressive strength is declined when conditions unfavorable for concrete curing such as delay of a laid period of bubble sheets, induction of large distance between sheets, increase of water content inside bubble sheets and thinness of a structure of placing concrete, etc. were applied, but it appeared that as its age passes, the difference becomes small.

본 연구에서는 한중 콘크리트의 단열보온양생 공법재료로 사용되고 있는 이중버블시트의 다양한 포설 시공조건 변화에 따른 단열보온성능을 검토하였는데, 그 결과는 다음과 같다. 먼저, 시공요인에 따른 콘크리트의 온도이력의 경우 4시간 이내의 버블시트 포설시기 변화 및 버블시트내 함수율 변화는 전체적으로 큰 차이없이 유사한 온도이력 및 적산온도를 나타냈으나, 구조체가 얇거나 여러 장의 버블시트를 포설할 경우 시트간 간격이 크게 발생하면 콘크리트 초기양생에 불리한 요건이 발생할 수 있음을 확인할 수 있었다. 콘크리트의 코어공시체 압축강도는 버블시트의 포설시기를 지연시키거나, 시트간 간격을 크게 유발시키거나, 버블시트내 함수율을 증가시키거나, 타설 콘크리트 구조체 두께가 얇게 되는 등 콘크리트 양생에 불리한 조건을 적용시킬수록 초기 압축강도는 저하하는 것으로 나타났으나, 재령이 경과할수록 그 차이는 작아지는 것으로 나타났다.

Keywords

References

  1. Han CG, Oh SG Shin DH, Jeon CK, Kim J, The Insulating Curing Method of Cold Weather Concreting using Double Bubble Sheet, Journal of Korea Concrete Institute, 2006;18(6):51-59
  2. Korea Meteorological Administration, http//: www.kma.go.kr
  3. Hong SM, Baek DH, Han MH, Han CH, Temperature History of Concrete Corresponding to Various Bubble Sheet Layer and Curing Temperature, Proceeding of Korea Institute of Building Construction, 2008;8(2):21-25
  4. Han CH, Kim SS, Lim CH, Kim JB, Temperature Profile and Strength Development of Concrete for Deck Plate depending on Surface Insulation Curing Method Subjected to Cold Weather, Journal of Architectural Institute of Korea, 2007;23(2):81-88
  5. Hong SM, Baek SH, Kim J, Jeon CH, Han MH, Han CH, Field Application of Insulation Curing Method with Double Bubble Sheet Subject to Cold Weather, proceeding of the Korea Institute of Building Construction, 2008;8(1):57-60 https://doi.org/10.5345/JKIC.2008.8.1.057

Cited by

  1. The Effect of Heat Curing Methods on the Protection against Frost Damage at Early Age of the Concrete Under Extremely Cold Climate vol.13, pp.6, 2013, https://doi.org/10.5345/JKIBC.2013.13.6.513