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콘크리트 교면포장의 자기균열치유 특성에 대한 검토 연구
전성일,윤경구,안지환,최판길,Jeon, Sung IL,Yun, Kyung Ku,An, Ji Hwan,Choi, Pan Gil 한국도로학회 2017 한국도로학회논문집 Vol.19 No.1
PURPOSES : The purpose of this study is to verify the property of self-healing, and to propose an appropriate duration for wet curing of bridge deck concrete overlays. METHODS : In this study, reinforced bars were inserted into concrete molds in order to prevent brittle fracture and induced cracks in the concrete resulting from indirect tension mode. The induced time of concrete cracking was 3 to 7 days, following which the concrete specimens were cured in water. The resulting concrete crack width was measured using image analysis equipment. Additionally, the self-healing tests were performed using the following three mixtures: OPC, SFC, and LMC. RESULTS : Concrete mixtures with crack widths of $150{\mu}m$ or lower were completely healed by Day 28. Hydrates of crack fills were found to be the calcium carbonate. CONCLUSIONS : The cement-based mixtures exhibit properties of self-healing. Considering these properties, it is necessary to increase the curing duration of concrete overlays for bridge decks.
홍승호,이경하,김낙영,윤경구,Hong, Seung-Ho,Lee, Kyung-Ha,Kim, Nag-Young,Yun, Kyong-Ku 한국터널지하공간학회 2005 터널기술 Vol.7 No.3
본 논문에서는 터널별로 매설된 온도계의 연중계측을 통하여 년 중 온도변화특성과 갱구부로부터의 길이별 온도변화특성, 터널연장별 대기 온도변화특성, 지표부 온도 변화특성을 분석하였다. 터널의 연장별 터널내 바닥부 온도 분포에 대한 분석 결과 입구부와 출구부가 다른 온도분포를 보임을 알 수 있었다. 출구부에서의 터널내 바닥부 표면온도 분포는 출구부에서 50m 지점까지는 온도가 변하다가 50m 이후 깊이에서는 터널연장에 상관없이 거의 일정한 온도분포를 보임을 알 수 있었다. 그러나 입구부에서의 터널내 바닥부 표면온도 분포는 출구부와 달리 터널내 길이 약 125~150m 지점에서 본도분포가 변하고 있음을 알 수 있었다. 이는 입구부로 유입되는 찬공기가 풍향 및 풍속의 영향을 받아 터널깊이 약 125~150m 지점까지 영형을 끼치는 것으로 보인다. This paper analyzed characteristic of temperature change as well as bottom of tunnel with thermometer according to tunnel length and region during one year. And it measured temperature distribution near tunnel portal. In the paper it was known that tunnel entrance and exit have different characteristic temperature distribution in accordiance with bottom of tunnel per tunnel length. Temperature of tunnel changed from tunnel exit to fifty meter and distribution of tunnel temperature was established uniform regardless of tunnel length. But temperature distribution of tunnel changed in tunnel entrance differ from tunnel exit in the location of one hundred twenty five meter and one hundred fifty meter. Cold air inflowed from tunnel entrance have influenced with the location of one hundred twenty five meter and one hundred fifty meter.
국산 저가형 실리카퓸을 이용한 고성능 콘크리트의 물리적 특성 분석
김상도(Kim Sang Do),윤경구(Yun Kyung Ku),한승연(Ham Seung Yeon),이겨레(Lee Kyeo Re) 강원대학교 산업기술연구소 2017 産業技術硏究 Vol.37 No.1
In this study, as part of a research on the development of economical high-performance concrete with high strength and high quality, the physical properties of high-performance concrete were analyzed by substituting a certain amount of low-cost domestic silica fume exempted from the re-importation type distribution structure of the domestic production and the existing high-priced silica fume distribution structure. Performing tests to identify the physical properties of the fresh and hardened concrete and durability analogy of the concrete which use low-cost domestic silica fume and imported silica fume, the chloride ion penetration resistance test result showed that the strength difference between the low-cost silica fume and the imported silica fume is not big but the strength of the low-cost silica fume was measured higher than the imported silica fume. The chloride ion penetration resistance of all variables was measured as “very low”. Since the low-cost domestic silica fume can be used as a high-performance admixture of concrete, the results suggest that it is possible to produce a more economical high-performance concrete.
박제선(Park Je Seon),이주형(Lee Joo Hyung),김태경(Kim Tea Kyung),윤경구(Yun Kyung Ku) 강원대학교 산업기술연구소 1998 産業技術硏究 Vol.18 No.-
This study focused on the development of an alternative stress estimation procedure to instantly calculate the critical stresses bonded concrete pavement. Closed form analysis is commonly used to analyze pavement structures. This type of analysis assumes linearelastic material properties and static loading conditions. The well-known ILLI-SLAB finite element program was used for the analysis. Bonded concrete overlay analyzed the stress distribution, behavior and load carrying capacity under track load is made evaluation standard of bonded concrete overlay. In the study, the following results were derived ; The properties of strength is that compress and 3-point bending strength of existing pavement is deteriorated with 184 kg/㎠, 59 kg/㎠ but compress and splitting tensile strength of overlay is satisfied with 465 kg/㎠, 45 kg/㎠. Load transfers is happen at adjacent slab by interlocking under track load. The stress distribution under interior, corner and edge load is described high loading position surrounding then loading position.
김성환(Kim Seong-Hwan),김성권(Kim Seong-Kwon),윤경구(Yun Kyung-Ku),이일화(Lee Il-Hwa) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
It had been already studied up on the strength characteristic of pre-packed concrete for paved track. the results also were represented. However, the study on estimation of durability about pre-packed concrete for paved track is in lack. Durability index could be estimated conducting such items as resistance of freezing-thawing, resistance of corrosion by acid, chloride and water flowing, electric current and reinforcing bar, environmental effects. Accordingly, in this study, durability index of pre-packed concrete for paved track is estimated though the various experiments which are resistance of chloride ion penetration and chemicals, absorption ratio of concrete, dry-shrinkage. Based on the results of various tests, they showed that the durability index of pre-packed concrete for paved track is excellent.