Prevention of Early Frost Damage of the Concrete under Severely Low Temperature according to Heat Curingmethods

Title & Authors
Prevention of Early Frost Damage of the Concrete under Severely Low Temperature according to Heat Curingmethods
Han, min-Cheol;

Abstract
Concrete exposed to severely low temperature below $\small{-20^{\circ}C}$ should be provided with proper heat supplying curing to protect the concrete from early frost damage at the time of pouring.meanwhile, so far, effective heat curingmethods of the concrete under severely low temperature are not well established in Korea. For this reason, the objective of this paper is to provide effective heat curingmethod of concrete exposed to severely low temperature to protect early frost damage by varying the combination of heat curingmaterial combinations. Temperature history,maturity development and core strength results are investigated. Fourmock-up specimens simulating slab, wall and column were prepared and heat insulation, heat supplying and both were applied. Test results indicate that the combination of quadruple layer bubble sheet(4BS) and embedding of heating cable has desirable performance for a slab, and heat supplying curing inside heat enclosure and heat generationmat also shows desirable performance for a wall, and for a column, use of EPS heat insulation has proper performance against early frost damage, which reaches $\small{45^{\circ}D{\cdot}D}$ and helps the concretemaintain above $\small{0^{\circ}C}$ within 3 days. Themethodsmentioned above are believed to be optimum protection from early frost damage of the concrete under $\small{-20^{\circ}C}$.
Keywords
heat curingmethods;temperature history;quadruple layer bubble sheet;heating cable;
Language
Korean
Cited by
References
1.
Han CG, HanmC, Baek DH, Son HJ, Hong SM. Temperature history of concrete according to the coveringmethod of double layer bubble sheet. Proceeding of Korea Institute of Building Construction; 2010may 12; Seoul, Korea. Korea Institute of Building Construction; p. 71-72

2.
Lee DB, Kim HR, Lee JW, ParkJH, Choi IH. A curingmethod of cold weather concreting using heating cable in winter construction. Journal of the Korea Concrete Institute. 2006 Dec;18(6):46-50.

3.
Shim JH. Cold weather construction using outside heat insulation form, Proceeding of Recent Cold Weather Concreting Seminar of Korea Institute of Building Construction; 2014 Dec 12-13; Seoul, Korea. p. 105-18.

4.
Jung EB, Shin HS, HanmC. The effect of heat curingmethods on the protection against frost damage at early age of the concrete under extremely cold climate. Journal of the Korea Institute of Building Construction. 2013 Dec.;13(6):513-21.

5.
Han SH, Kim JK, Park YD. Prediction of compressive strength of fly ash concrete by a new apparent activation energy function. Journal of the Korea Concrete Institute, 2001 June;13(3):237-43.

6.
Nakashimam. Recommendation for cold weather concreting, 5th ed. Tokyo: Architectural Institute of Japan; 2010. p. 1-25.