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양생자동화 시스템을 이용한 매스 콘크리트 온도균열 제어

Control of Thermal Crack in Mass Concrete Using Automated Curing System

  • Ha, Ju-Hyung (Advanced Material R&D Team, Hyundai Institute of Construction Technology) ;
  • Cho, Yun-Gu (Advanced Material R&D Team, Hyundai Institute of Construction Technology) ;
  • Hyun, Tae-Yang (Advanced Material R&D Team, Hyundai Institute of Construction Technology) ;
  • Lim, Chang-Keun (Advanced Material R&D Team, Hyundai Institute of Construction Technology) ;
  • Seo, Tae-Seok (Advanced Material R&D Team, Hyundai Institute of Construction Technology)
  • 투고 : 2012.09.26
  • 심사 : 2013.02.01
  • 발행 : 2013.04.30

초록

이 연구에서는 기존의 수화열저감 공법에서 문제가 되었던 시공성, 공기, 공사비용 등의 효율성을 높이기 위해 새로운 매스 콘크리트의 온도균열 발생 저감시스템을 개발하였다. 이 시스템은 매스 콘크리트에 발생하는 온도균열을 제어하기 위해서 타설 예정 매스 콘크리트 구조체 중심부와 표면부에 온도센서를 매립한 후 콘크리트를 타설하고, 온도제어시스템을 통해 내 외부 온도차이가 균열제어 기준 온도를 초과하면 온도차를 그 이하가 될 수 있도록 자동으로 구조체 표면에 적정온도의 양생수를 공급하여 온도균열 발생을 제어하는 양생 자동화 시스템이다. 이 시스템의 타당성을 검토하기 위해서 mock-up 테스트를 실시하였으며, 이 시스템의 우수성을 확인할 수 있었다.

New thermal crack control system for mass concrete was developed to increase quality and to save construction period and cost. The principle of this system is that the curing water having proper temperature is supplied automatically to the surface of mass concrete member to keep the temperature difference between center and surface of concrete less than generally recommended temperature difference ($20^{\circ}C$). Mock-up test was conducted to investigate the validity of newly developed curing system. As a result, no crack was founded in the specimen using automated curing system developed in this study, while many cracks occurred in another specimen without automated curing system. It was also confirmed that the strength and the durability of the concrete cured by automated curing system were improved.

키워드

참고문헌

  1. Korea Concrete Institute, Thermal Crack Control in Mass Concrete, Kimoondang Publishing Company, Seoul, Korea, 2010, 166 pp.
  2. Kanda, T., "Quantitative Evaluation of Shrinkage Cracking Initiation," Concrete Journal, Vol. 43, No. 5, 2005, pp. 60-65.
  3. Kim, H. S., Han, S. B., and Kim, H. R., "Hydration Heat Analysis according to Heat Transfer Coefficient of Massive Concrete using Coarse Particle Cement," Journal of Architectural Institute of Korea, Vol. 25, No. 5, 2009, pp. 63-70.
  4. Baek, D. I. and Kim, M. S., "Application of Heat Pipe for Hydration Heat Control of Mass Concrete," Journal of the Korea Concrete Institute, Vol. 20, No. 2, 2008, pp. 157-164. https://doi.org/10.4334/JKCI.2008.20.2.157
  5. Bamforth, P. B., Early-Age Thermal Crack Control in Concrete, CIRIA C660, London, 2007.
  6. BS 8110-2, Structural Use of Concrete-Part1: Code of Practice for Special Circumstances, British Standard, 1985, 23 pp.
  7. JSCE, Specification for Design and Construction of Concrete Structures (Construction part)-Mass Concrete, 1996, pp. 173-193.
  8. KS F 2403, Standard Test Method of Making and Curing Concrete Specimens, Korean Agency for Technology and Standard, 2010, pp. 1-8.
  9. KS F 2405, Standard Test Method for Compressive Strength of Concrete, Korean Agency for Technology and Standard, 2010, pp. 1-6.
  10. KS F 2423, Method of Test for Splitting Tensile Strength of Concrete, Korean Agency for Technology and Standard, 2006, pp. 1-7.
  11. ASTM C 1202, Standard Test Method for Electrical Indication of Concrete's Ability to Resist Chloride Ion Penetration, ASTM International, 2005, pp. 1-6.

피인용 문헌

  1. A Study on the Thermal Crack Control of Foundation for Large Turbine vol.26, pp.3, 2014, https://doi.org/10.4334/JKCI.2014.26.3.287