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NTIS 바로가기한국건축시공학회지 = Journal of the Korea Institute of Building Construction, v.18 no.6, 2018년, pp.533 - 541
김혁중 (Industry Academic Cooperation Foundation, Hankyong National University) , 장승엽 (Department of Transportation System Engineering, Graduate School of Transportation, Korea National University of Transportation) , 윤용식 (Department of Civil Engineering, Hannam University) , 권성준 (Department of Civil Engineering, Hannam University)
Chloride attack, one of the major deterioration phenomena in RC(Reinforced Concrete) structure, causes corrosion of reinforcement, and this leads degradation of serviceability and structural problems. The application of silicate based impregnant to concrete surface are known for excellent constructa...
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핵심어 | 질문 | 논문에서 추출한 답변 |
---|---|---|
실리케이트 기반 표면함침제의 개발은 어떤 효과를 가지고 있는가? | 최근 들어 표면 보호기법 중 실리케이트 기반 표면함침제의 개발은 콘크리트에 잔존하는 수산화칼슘과 모세관 현상을 통해 침투한 실리케이트와의 반응을 통해 콘크리트와 동일한 재질로 표면의 강화층을 형성하는 효과를 갖고 있다[7,8,9]. 침투층을 증가시키기 위해 가수 분해된 실리케이트, 규산염계 실리케이트 등 점도와 표면장력을 고려하여 다양한 표면 강화재료가 개발되고 있다[12]. | |
염해에 노출된 구조물의 특징은? | 염해에 노출된 구조물은 사용기간의 증가에 따라 매립된 철근의 부식이 발생하며, 이로 인해 사용성 및 구조 안전성의 저하가 발생한다[1,2]. 여러 할로겐 이온 중 염화물 이온(Cl-)은 이온의 전파속도가 가장 빠르며, 철근의 국소적인 부식 (Local corrosion-pitting)을 야기하므로[3], 각국의 시방 규정 또는 지침에서 염해에 대한 내구성 설계 및 물성 평가를 수행하도록 규정되어 있다[4,5,6]. | |
표면 함침제의 열화 이외의 문제점은? | 단순한 외부 열화인자의 차폐를 위해서는 유기계 표면보호재의 사용이 경제성 면에서 선호되지만, 표면 열화이외에 다양한 문제점을 가지게 된다. 특히 구체 콘크리트와의 물리적인 차이점이 발생하는데, 체적변화성(Dimensional Stability)으로 인한 균열 발생이 대표적이다. 콘크리트 구체와 다른 온도 및 습도에 따른 거동은 장기적으로 보수층과 박리(Delamination)를 야기하며, 수분이 배면으로 야기되는 조건에서 이러한 영향은 더욱 가속화된다[10,11]. |
Broomfield JP. Corrosion of Steel in Concrete: Understanding, Investigation and Repair. 1st ed. UK, London: Taylor & Francis; 1997. Chapter 1. p. 1-15.
Sarja A, Vesikari E. Durability Design of Concrete Structures. 1st ed. UK, London: Taylor & Francis; 1994. Chapter 3. p. 28-52.
Lee SK, Zielske J. An FHWA Special Study: Post-Tensioning Tendon Grout Chloride Thresholds. USA: Federal Highway Administration(USA); 2014 May. 200 p. Report No.: FHWA-HRT-14-039.
Japan Society of Civil Engineers (JSCE). Standard Specification for Concrete Structures-Design JSCE Guidelines for Concrete 15. Japan, Tokyo: Japan Society of Civil Engineers (JSCE); 2007. p. 1-10.
European Committee for Standardization. Eurocode 1: Basis of Design and Actions on Structures; EN-1991. Belgium: Comitee Europeeen de Normalization; 2000. p. 4-12.
American Concrete Institute(ACI) Committee-201. Guide to Durable Concrete ACI 201R-08. (Michigan)USA,: American Concrete Institute; 2008. p. 1-14.
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Park SS, Kim YY, Lee BJ, Kwon SJ. Evaluation of concrete durability performance with sodium silicate impregnants. Advances in Materials Science and Engineering. 2014 Aug;2014:1-11.
Emmons PH. Concrete Repair and Maintenance Illustrated: Problem Analysis, Repair Strategty, Techniques. 1st ed. USA, Wiley: RS Means Company; 1993 Oct. p. 10-29.
Bank LC. Composites for Construction: Structural Design with FRP Material. 1st ed. USA, New Jersey: John Wiley & Sons; 2006. Chapter 1. p. 20-8.
Kim HJ. A Study on the development of functional concrete using permeating agents and photocatalyst [dissertation]. [Jeonju (Korea)]: Chonbuk national university; 2010. 192 p.
Thomas MDA, Bamforth PB. Modelling chloride diffusion in concrete: Effect of fly ash and slag. Cement and Concrete Research. 1999 Apr;29(4):487-95.
Lee HS, Kwon SJ. Analysis technique on time-dependent PDF (Probability of Durability Failure) considering equivalent surface chloride content. Journal of the Korea Institute for Structural Maintenance and Inspection. 2017 Mar;21(2):46-52.
Lee JW, Kim KM, Bae YK, Lee JS. Study on the field application according to the early strength of the concrete admixed with polycarboxylate superplasticizer. Proceeding of Korea Concrete Institute; 2004 May 21-22; Pyoengchang (Korea). Seoul (Korea): Korea Concrete Institute; 2004. p. 200-3.
Yoo JG. Durability Design of Concrete and Evaluation of Field Application on Reinforced Concrete Structure Exposed to Marine Environment [Ph.D. thesis]. [Daejeon (Korea)]: Chungnam University; 2010. 25-26 p.
Oh HM. An assessment of concrete durability using inoragnic and organic/inorganic surface penetration agents [Master's thesis]. [Wonju (Korea)]: Sangji University; 2004. 44 p.
Berke NS, Hicks MC. Predicting chloride profiles in concrete. CORROSION. 1994 Mar;50(3):234-9.
Yoon YS, Park JS, Hwang CS, Kwon SJ. Evaluation of relationship between strength and resistance to chloride in concrete containing fly ash with ages. Journal of the Korea Institute for Structural Maintenance and Inspection. 2017 Jul;21(4):53-60.
Jang SY, Yoon YS, Kwon SJ. Derivation of optimum GGBFS replacement with durability design parameters. Journal of the Korea Recycled Construction Resources Institute. 2018 Mar;6(1):36-42.
Lee HS, Kwon SJ. Probabilistic analysis of repairing cost considering random variables of durability design parameters for chloride attack. Journal of the Korea Institute for Structural Maintenance Inspection. 2018 Jan;22(1):32-9.
Thomas MDA, Bentz EC. Computer program for predicting the service life and life-cycle costs of reinforced concrete exposed to chlorides. Life365 Manual. USA: Silica Fume Association (SFA); 2002. p. 2-28.
Lee SH, Kwon SJ. Experimental study on the relationship between time-dependent chloride diffusion coefficient and compressive strength. Journal of the Korea Concrete Institute. 2012 Dec;24(6):715-26.
Polder RB, van der Wegen G, Boutz M. Performance based guideline for service life design of concrete for civil engineering structures - A proposal discussed in the Netherlands. In: Baroghel-Bouny V, Andrade C, Torrent R, Scrivener K, editors. International RILEM Workshop on Performance Based Evaluation and Indicators for Concrete Durability; 2007 Spain, Madrid. France: RILEM; 2007. p. 31-9.
Yoon YS. Evaluation of time-dependent chloride resistance in HPC(High Performance Concrete) containing fly ash [master's thesis]. [Daejeon (Korea)]: Hannam University; 2018. 79 p.
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