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Air-Void Structure of Very-Early Strength Latex-Modified Concrete Using Ultra-Fine Fly Ash  

Choi, Pan-Gil (강원대학교 토목공학과)
Park, Won-Il ((주)미래기술단)
Yun, Kyong-Ku (강원대학교 토목공학과)
Lee, Bong-Hak (강원대학교 토목공학과)
Publication Information
Journal of the Korean Society of Hazard Mitigation / v.10, no.2, 2010 , pp. 47-53 More about this Journal
Abstract
Very-early strength latex-modified concrete (VES-LMC) was developed with a focus on workability, strength development and long-term durability that would allow for opening a bridge to traffic only 3 hours after concrete placement, which would be useful when repairing concrete bridge deck overlays. However, even though usage of latex in VES-LMC improves the durability, it has a disadvantage that it produces lots of entrained air. Therefore, specific plan is necessary since it is weak for freezing and thawing in air-void structure. In the present study ultra-fine fly ash (UFFA) was used. Test results are follows ; Air content of VES-LMC UFFA (VES-LMC using UFFA) concrete was decreased since major pozzolan reaction was happened in one day. It was also found that total air content of concrete was decreased with pozzolan reaction since air content in 28 days was the same with one day air content. The addition of calcium hydroxide increased entrained air which is smaller than size of 200 ${\mu}m$. It was effective to improve the air-void structure of VES-LMC since spacing factor can be confirmed as smaller than size of 200 ${\mu}m$ using more than 15% of UFFA.
Keywords
VES-LMC; ultra-fine fly ash; air-void structure; spacing factor;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Powers T.C (1949) The Air Requirement of Frost-Resistant Concrete, Research Laboratories of the Portland Cement Association, Vol. 29, pp.1-28.
2 Yun, K.K., Kim, D.H., and Choi, S.Y. (2004) Durability of Very-Early-Strength Latex-Modified Concrete Against Freeze-Thaw and Chemicals, Transportation Research Record 1893, TRB, National Research Council, Washington, pp.1-10.
3 Attiogbe, E.K. (1996) Predicting Freeze-Thaw Durability of Concrete-A New Approach, ACI Materials Journal, Vol.93, No.5, pp.457-464.
4 Sidney Mindess, J. Francis Young, David Darwin (2003) CONCRETE second edition, pp.169-176
5 NCHRP Report 540 (2005) Guidelines for Early-Opening-to-Traffic Portland Cement Concrete for Pavement Rehabilitation, Report Number 540, TRB.
6 이승헌, Estuo Sakai, Masaki Daimon (2000) 전기집진장치로부 터 단별 채취한 플라이 애시의 수열반응성, 한국세라믹학회지, Vol.37, No.8, pp.811-816.
7 Kansas DOT Specification (2007) Division 400 Concrete Standard Specifications, 401 Concrete, 401-5 Commercial Grade Concrete, pp.400-1-400-14.
8 Kuhlmann, L.A. (1983) Latex Modified Concrete for Deck Repair and Rehabilitation, American Society of Civil Engineering Specialty Conference on New Materials and Process for Street, Highway, and Airport.
9 김기헌 (2006) 초속경 라텍스개질 콘크리트(VES-LMC) 균열발생 원인분석 및 억제방안, 공학박사학위 논문, 강원대학교 대학원.
10 최판길 (2010) 초고분말도 플라이 애시를 사용한 초속경 LMC의 초기수축 및 공극구조 특성, 공학박사학위 논문, 강원대학교대학원.
11 ASTM C 457-82a (1982) Standard Practice for Microscopical Determination of Air-Void Content and Parameters of the Air- Void System in Hardened Concrete, ASTM.
12 한천구 외 (2003) 팽창재 및 수축저감제를 이용한 고성능 콘크리트의 수축특성, 콘크리트학회 논문집, 제15권 제6호 pp.785-793.   과학기술학회마을