DOI QR코드

DOI QR Code

A Fundamental Experiment on Preventing Frost Damage at Early Age of Mortar in Low Temperature using Reduction Slag

환원슬래그를 사용한 모르타르의 저온에서의 초기동해 방지에 관한 기초적 실험

Min, Tae-Beom;Mun, Young-Bum;Kim, Hyeong-Cheol;Choi, Hyun-Kuk;Kim, Jae-Young;Lee, Han-Seung
민태범;문영범;김형철;최현국;김재영;이한승

  • Received : 2015.09.24
  • Accepted : 2015.11.03
  • Published : 2016.02.20

Abstract

In this research, it used cement powder and reduction slag, which generates high hydration heat in hydration reaction without heat cure below $-5^{\circ}C$ degree. Purpose of final research is preventing freezing and thawing by making the compressive strength 5MPa in 3days below zero temperature due to own heat of concrete. and it is the result of physical characteristic and thermal property evaluation of reduction slag. Because reduction slag generates high hydration heat, compressive strength development is excellent. By generating highly hydration heat by $C_{12}A_7$ and $C_3A$ in reduction slag, compressive strength is developed in low temperature. In case of displacing only reduction slag without $SO_3$, it is indicated that quick-setting occurs by shortage of $SO_3$. For preventing quick-setting, gypsum is used essentially. According to this research result, in case of using reduction slag and gypsum as a ternary system, compressive strength developed 5MPa in 3 days below zero temperature. It is identified to prevent early frost damage of concrete below zero temperature.

Keywords

low temperature environment;early-frost damage;reduction slag;hydration heat;gypsum

References

  1. Kim YJ, Lee SS, Won C, Park SJ. Strength Properties of Mortar Mixed with Accelerator for Freeze Protection in Constant and Variable Temperature Condition. Journal of the Korea Concrete institute. 2002 Dec;16(6):942-8
  2. Lee SS. A Study on the improvement of Strength delay according to Low Temperature of Cold Weather Concrete. Journal of the Korean Recycled Construction Resources institute. 2012 Mar;7(1):51-9
  3. Won C, Park SJ, Lee SS. A Site Application of Winter Concrete using Freezing Protection Accelerator. Journal of the Korea Concrete institute. 2006 Nov;18(6):38-45
  4. Cho HW, Shin HS, Lee JH. Development Ultra Rapid Hardening Construction Materials on Cold Weather Environment Considering Curing Temperature. Journal of the Korea Institute for Structural Maintenance and Inspection. 2013 Sep;17(5) :59-66 https://doi.org/10.11112/jksmi.2013.17.5.059
  5. Lim CK, Han MC. Curing and Mixture Design of Cold Weather Concrete Applying Heat Insulation and Heat Supplying Curing. Journal of the Architectural Institute of Korea. 2010 Jun;26(6):77-84
  6. Bullard JW, Jennings HM, Livingston RH, Nonat A, Scherer GW, Schweitzer JS, Scrivenner KL, Thomas JJ. Mechanisms of cement hydration. Cement and Concrete Research. 2011 Dec;41(12):1208-23 https://doi.org/10.1016/j.cemconres.2010.09.011
  7. Lee KJ, Koo JS, Kim JM, OH SY. Study on Physical and Chemical Properties of CaO-Al2O3 System Melting Compound. Journal of the Korea Concrete institute. 2013 Apr;25(2):209-15 https://doi.org/10.4334/JKCI.2013.25.2.209
  8. Kim JM, Choi SM, Kim JH. Evaluation for Applicability as the Inorganic Binder with Rapid Setting Property for Construction Material of LFS Produced from Various Manufacturing Process. Journal of the Korean Recycled Construction Resources institute. 2012 Jun;7(2):70-7
  9. Choi JS, Jang PS, JO YJ. Experimental Study on the Application of Concrete Admixture using the EAF Reduction Slag. Journal of the Korea Academin-industrial cooperation society. 2014 Nov;15(11):6890-7 https://doi.org/10.5762/KAIS.2014.15.11.6890
  10. An YJ, Choi JS, Bae KH, Kim HS. Hydration Property of Electric Arc Furnace Reduction Slag. Journal of the Korean Institute of Resources Recycling. 2010 Dec;19(6):93-101

Acknowledgement

Supported by : Ministry of Land, Transport, and Maritime Affairs