DOI QR코드

DOI QR Code

Properties of Hydration Heat of High-Strength Concrete and Reduction Strategy for Heat Production

고강도 콘크리트의 수화열 특성 및 발열 저감대책에 관한 연구

  • Jaung, Jae-Dong (Department of Architectural Engineering, Daegu University) ;
  • Cho, Hyun-Dae (Department of Architectural Engineering, Daegu University) ;
  • Park, Seung-Wan (Department of Architectural Engineering, Daegu University)
  • Received : 2011.11.03
  • Accepted : 2012.01.26
  • Published : 2012.04.20

Abstract

Recently, the interest and demand for large-scale buildings and skyscrapers have been on the rise, and the performance of concrete is an area of high priority. Securing 'mass concrete and high strength concrete' is very important as a key construction technology. For high strength concrete, the high heat of hydration takes place inside the concrete because of the vitality of hydration in cement due to the large amount of powder, and leads to problems such as an increase of thermal stress due to the temperature difference with the outside, which results in cracks and slump loss. For this reason, measures to solve these problems are needed. This study aims to reduce the hydration heat of high strength concrete to control the hydration heat of mass concrete and high strength concrete, by replacing the type of admixture, The purpose of this study is to control the hydration heat of high strength concrete and mass concrete. Our idea for this purpose is to apply not only the types and contents of admixture but also incorporation mixing water to ice-flake. As a result of the test, the use of blast furnace slag and fly ash as admixture, and the use of ice-flake as mixing water can improve the liquidity of concrete and reduce slump loss. Significantly dropping the maximum temperature will contribute greatly to reducing cracks due to hydration heat in mass concrete and high strength concrete, and improve quality.

최근 국내에서는 대형 및 초고층화 건축물에 대한 관심과 수요가 증가하고 있는 추세와 함께 콘크리트의 성능이 중요시 되고 있다. 이를 뒷받침하는 기술로 매스콘크리트 및 고강도 콘크리트 시공기술의 확보는 대단히 중요하다. 고강도 콘크리트의 경우 다량의 분체량에 따른 시멘트의 수화반응(hydration) 활성으로 콘크리트 내부에 높은 온도의 수화열이 발생하고 외부와 온도차로 인한 열응력의 증가 및 그로인한 균열, 슬럼프 로스현상 등의 문제점들이 많이 발생하고 있어 대책이 필요한 실정이다. 본 연구에서는 매스콘크리트 및 고강도 콘크리트의 수화열을 제어하기 위하여 혼화재의 종류와 혼입량의 변화, 배합수를 Ice-flake로 100% 대체함으로써 고강도 콘크리트의 수화열을 저감하고자 하였으며, 실험결과 콘크리트의 수화열 저감 방안으로 혼화재는 고로슬래그와 플라이 애쉬를 사용하고 배합수로 Ice-flake를 사용함으로써 콘크리트의 유동성개선 및 슬럼프로스 저감효과를 볼 수 있으며, 콘크리트 최고 온도를 크게 떨어트려 매스 콘크리트 및 고강도 콘크리트의 수화열에 의한 균열저감 및 품질향상에 크게 기여할 것으로 판단된다.

Keywords

References

  1. Kim JK, Kim KH. Thermal Stress Analysis for the Heat of Hydration Considering Creep and Shrinkage Effects in Mass Concrete. Journal of the Korea Concrete Institute. 1992 Jan;4(3):101-11.
  2. Kim SC, Kang SH, Kim JK. Evaluation of Thermal Characteristics in Association with Cement Types in Massive Concrete Structure. Journal of the Korea Concrete Institute. 1999 Jun;7(4):137-48.
  3. Moon, HY, Chio YW. The Effect of Ground Granulated Blast-Furnace Slag on the Control of Temperature Rising in High Strength Concrete. Journal of the Korea Concrete Institute. 1998 Jan;10(4):195-204.
  4. Lee EB, Kim GY, Koo KM, Lee HJ, Kim YS, Nam JS. Early Age Properties of Hydration Heat and Autogenous Shrinkage of High-Strength Mass Concrete. Journal of Architectural Institute of Korea. 2009 May;25(5):153-60.
  5. Kim JK, Kim KH, Yang JK. Thermal Analysis of the Heat of Hydration in Concrete with Considering Heat Reduction Techniques. Journal of the Korea Concrete Institute. 1995 Jan;7(6):176-85.
  6. Kim MH, Choi SJ, Oh SD, Kim YR, Lee JH. A Study on the Effect of Admixture Types and Replacement Ratio on Hydration Heat Reduction of High-Strength Concrete. Journal of the Korean Institute Building Construction. 2002 May;2(2):145-50. https://doi.org/10.5345/JKIC.2002.2.2.145
  7. Han CG, Oh SK, Yoon CH, Hwang YS. A Study on the Reduction of Hydration Heat of Division-Placed Mass Concrete Considering the Difference of Setting Time of Super Retarding Agent. Journal of Architectural Institute of Korea. 2003 Jul;19(7):79-86.
  8. Baek DI, Kim MS. Application of Heat Pipe for Hydration Heat Control of Mass Concrete. Journal of the Korea Concrete Institute. 2008 Apr;20(2):157-64. https://doi.org/10.4334/JKCI.2008.20.2.157
  9. Chung CH, Park JH, Lee SH. Study on Precooling of Concrete Using Ice and Cooling Water. Journal of the Korea Concrete Institute. 2000 Jan;12(3):95-102.
  10. Bae SH, Jaung JD. An Experimental Study on the Temperature and the reduction of slump loss in concrete using ice. Proceeding of Autumn annual Conference in the Architectural Institute of Kore; 2002 Act 26; Kunsan National University. Seoul (Korea): Architectural Institute of Korea; 2002. p. 303-6.

Cited by

  1. Influence on Compressive Strength and Drying Shrinkage of Concrete with Urea-Water Soluble Sulfur Admixture vol.31, pp.5, 2016, https://doi.org/10.14346/JKOSOS.2016.31.5.74
  2. Effects of Sugar and Hydrated Cement Powder on the Reduction in Heat of Hydration vol.14, pp.2, 2014, https://doi.org/10.5345/JKIBC.2014.14.2.135
  3. Effects of Replacement Ratio and Fineness of GGBFS on the Hydration and Pozzolanic Reaction of High-Strength High-Volume GGBFS Blended Cement Pastes vol.27, pp.2, 2015, https://doi.org/10.4334/JKCI.2015.27.2.115
  4. Determination of Water-to-Binder Ratios on the Equivalent Compressive Strength of Concrete with Supplementary Cementitious Materials vol.27, pp.6, 2015, https://doi.org/10.4334/JKCI.2015.27.6.687
  5. The Reduction of Maximum Hydration Temperature in Cement Paste Using Calcium Silicate Hydrates and Glucose vol.27, pp.3, 2015, https://doi.org/10.4334/JKCI.2015.27.3.265
  6. Effect of Fiber Addition for Improving the Properties of Lightweight Foamed Concrete vol.15, pp.4, 2015, https://doi.org/10.5345/JKIBC.2015.15.4.383
  7. Effects of Limestone Powder and Silica Fume on the Hydration and Pozzolanic Reaction of High-Strength High-Volume GGBFS Blended Cement Mortars vol.27, pp.2, 2015, https://doi.org/10.4334/JKCI.2015.27.2.127