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철근의 부식량 비파괴 측정기법 개발을 위한 적외선 열화상 DB구축
백인관(Paik In-Kwan),성진경(Sung Jin-Kyung),조승호(Cho Seung-Ho),정란(Chung Lan) 한국구조물진단유지관리학회 2003 한국구조물진단학회 학술발표회논문집 Vol.- No.-
Corrosion of reinforcing bars in concrete structures influences lifespan negatively and makes losses. In order to make longer lifespan and prevent losses, a qualitative measurement technique which can measure the extent of corrosion of reinforcing bar need to be developed. The purpose of this study is to develope technique to measure corrosion of reinforcing bars using infrared thermal photography graphic data. The result of experimental study shows that a test body emits stronger infrared thermal distribution on concrete surface which contains relatively more corroded reinforcing bar.
철근의 부식량 비파괴 측정기법 개발을 위한 적외선 열화상 DB구축
백인관 ( Paik In-kwan ),성진경 ( Sung Jin-kyung ),조승호 ( Cho Seung-ho ),정란 ( Chung Lan ) 한국구조물진단유지관리공학회 2003 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.7 No.1
Corrosion of reinforcing bars in concrete structures influences lifespan negatively and makes losses. In order to make longer lifespan and prevent losses, a qualitative measurement technique which can measure the extent of corrosion of reinforcing bar need to be developed. The purpose of this study is to develope technique to measure corrosion of reinforcing bars using infrared thermal photography graphic data. The result of experimental study shows that a test body emits stronger infrared thermal distribution on concrete surface which contains relatively more corroded reinforcing bar.
적외선 열화상 처리기법을 이용한 철근 부식률 비파괴 측정기법(Ⅱ)
백인관(Paik In-Kwan),조승호(Cho Seung-Ho),정란(Chung Lan) 대한건축학회 2005 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.25 No.1(구조계)
Corrosion of reinforcing bars embedded in concrete structures influences lifespan negatively and makes losses. In order to make longer lifespan and prevent losses, a qualitative measurement technique which can measure the corrosion level of reinforcing bar need to be developed. The purpose of this study is to develope the technique to measure the corrosion of reinforcing bars using infrared thermal photography graphic data. The result of experimental study shows that a test body emits stronger infrared thermal distribution on concrete surface which contains relatively more corroded reinforcing bar. Based on the infrared thermography database which constructed by the atmosphere temperature and concrete cover depth and many other test parameters, a qualitative corrosion evaluation can be made by comparing laboratory test results and the real site test results.
적외선 열화상 데이터를 이용한 초기온도 상승률에 따른 철근의 부식률 예측 기법
유주영,백인관,조승호,노영숙,정란,Yun,Ju-Young,Paik,In-Kwan,Cho,Seung-Ho,Roh,Young-Sook,Chung,Lan 한국방재학회 2007 한국방재학회 학술발표대회논문집 Vol.2007 No.1
In order to measure corrosion level of reinforcement rebar which is inside reinforced concrete structure, infrared thermographic technique was employed. Experimental test parameters were ambient temperatures, various levels of corrosion states. After analysis of temperature distributions of concrete surface, the amount of heat flux from the concrete surface is directly proportional to the corrosion level which is inside of concrete.
임종진,조승호,백인관,엄태성,이인오,한주연,Lim. Jongjin,Cho. Seungho,Paik. Inkwan,Um. Taesung,Lee. Inoh,Han. Juyeon 한국방재학회 2013 한국방재학회논문집 Vol.13 No.6
판형태 중공재를 사용한 중공슬래브는 중공에 의해 자중을 절감시킬 수 있어 제작 및 운송비용을 줄일 수 있다. 하지만 큰 중공률 때문에 전단저항성능이 감소될 수 있고, 중공재를 기준으로 슬래브의 상 하부 플랜지 콘크리트의 일체성에 취약할 수 있다. 본 연구에서는 판형 중공재를 사용하는 중공슬래브의 전단파괴모드와 전단강도에 대하여 연구하였다. 12개의 전단 실험체에 2점 가력을 수행하였다. 실험 변수는 중공률, 중공재 수직 위치, 수직철근(다월철근)의 설치여부 이다. 실험결과 슬래브 하부에 휨균열이 발생한 직후, 웨브 콘크리트의 상 하에서 수평균열이 발생하여 강성이 크게 저하되었다. 중공률 32.5% 이상의 슬래브 실험체는 웨브 콘크리트 수평균열로 인하여 최종파괴 되었지만, 중공률 28.9% 미만의 실험체는 일반 보에서 흔히 관찰되는 웨브 콘크리트의 대각전단파괴가 발생하였다. 중공슬래브 웨브 콘크리트의 최대 수평전단응력은 중공률이 32.5%에서 41.4%로 증가함에 따라 0.26 <TEX>$\sqrt{f_{ck}}$</TEX>에서 0.51 <TEX>$\sqrt{f_{ck}}$</TEX>로 증가하였다. 또한 수평균열과 직각으로 배근된 수직철근은 슬래브의 전단강도를 강화시켰다. Due to less weight (i.e. greater void ratio), voided concrete slabs with board-type voiding materials take advantages of easier fabrication and less transportation cost. However the shear resistance can be decreased due to the greater void ratio(or the poor integrity between concrete plates at the top and bottom of the voiding material). In the present study, the shear resistance and failure mode of the voided slabs with board-type voiding material were investigated. Two-point loading shear tests were performed for 12 slab specimens. Test parameters were the void ratio, the location of the voids, and the presence of reinforcing vertical bar (or dowel bar). Test results showed that premature horizontal cracking developed at the top and bottom of the web concrete, shortly after flexural cracking at the bottom of the slabs. The slab specimens with void ratios greater than 32.5% were ultimately showed the horizontal shear failure of the web concrete, while the specimens with the void ratios less than 28.9% showed the conventional diagonal shear failure. The maximum horizontal shear stresses of concrete at failure, increased 0.26 <TEX>$\sqrt{f_{ck}}$</TEX> to 0.51 <TEX>$\sqrt{f_{ck}}$</TEX> as the void ratio increased from 32.5 % to 41.4 %. The vertical bars of the web which were perpendicular to the horizontal cracks of the web concrete, enhanced the shear strength of the slabs.
적외선 열화상데이터를 이용한 철근 부식량 비파괴측정기법
정란 ( Chung Lan ),백인관 ( Paik In-kwan ),성진경 ( Sung Jin-kyung ) 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.1
On account of chlorides, the demage of reinforcing concrete structures is getting severely increased. In order to increase the term of existence of the reinforcing concrete structures by measuring the extent of the corrosion of the reinforcing bar and repairing properly, the infrared thermal data were used to introduce the quantitative way of measuring the extent of reinforcing bar corrosion. After making a proper test body with some decay, and giving heat on the reinforcing bar in the test body, infrared thermal data of the concrete surface were measured. As a result, when the extent of corrosion increases, the temperature of the reinforcing bar increases. On the other hand, when the extent of corrosion increases, the corrosion makes the temperature of the concrete body surface become lower.