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이한철(李漢哲)의 고건축 실측·수리 활동과 저술에 관한 연구
이정아,Lee, Joung-Ah 한국건축역사학회 2017 건축역사연구 Vol.26 No.1
This paper studied Lee Han-Choel's career who was known as the first Korean who had participated in several survey and repair projects of Korean historic buildings as a field engineer during the Japanese colonial era. This paper investigated documents and drawings to find out what he had done specifically in the field, and distinguished the records he had written by handwriting comparison method. In addition, the author analyzed the contents of the articles he published and clarified their significance in Korean architectural history. Through this study, the author expected to clarify Lee's historical status as the first Korean modern expert in the field of historic building conservation, and to supplement the research for the history of Korean during the Japanese colonial era.
중국 영파 보국사(保國寺) 대전의 7포작 양초양앙(兩抄兩昻) 공포의 외출목거리에 대한 연구
이정아,Lee, Joung-Ah 한국건축역사학회 2018 건축역사연구 Vol.27 No.2
The purpose of this study is to estimate the dimensions of the Protruding distance of Seven-layered Gongpo of Baoguosi Temple Main Hall in Ningbo, China, and to analyze the meaning of the dimension through the "Yingzaofashi(營造法式)" and other similar cases. Through this study, it is clarified that the "Yingzaofashi" stipulates the limited use of the structural role of Ha-ang, but Baoguosi Temple Main Hall has expanded the structural role of Ha-ang actively by increasing the total Protruding Distance and effectively controlling the Protruding Distance of the layer where Ha-ang is placed. And as a result, the effect of lowering the total height of the protruding part was confirmed.
이정아(Lee Joung-Ah),백대현(Baek Dae-Hyun),박종호(Park Jong-Ho),한민철(Han Min-Cheol),한천구(Han Cheon-Goo) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)
This study analyzed the basic characteristics and the revealing aspects of initial strength of the mortar mixing high fineness blast furnace slag powder (BS) and plaster to use as the basic experiment to complement the problems of the mortar using FA in the great quantity and the results are summarized as the followings. In case that BS and plaster are substitute for aggregateand for cement, respecively the liquidity of mortar was improved as compared with plain and then the improvement of workability was expected. Air content was decreased due that the occurrence of air bubble is restricted by micro filler effect of high fineness BS. In case of no metathesis of plaster at the strength characteristic of mortar using FA in the great quantity showed the lower strength at aging 1day, 3days and 7days than plain but showed the higher strength at aging 28days than plain. But, in case that the plaster was as 2%, along with the increase of metathesis of high fineness BS, the strength of aging 1day was appeared to be remarkably high rather than plain but that of aging 25 was appeared to be dulled. Synthetically, regarding the substitution method, BS cements rate was 2.5% at inside adding methasis rather than outside adding methasis and the addition of plaster by 1% is judged as the most efficient rate at the aspect of fluidity, strength and economical efficiency.
소듐계 조기 강도 발현형 혼화제를 사용한 플라이애쉬 다량 치환 콘크리트의 공학적 특성
이정아(Lee Joung-Ah),전규남(Jeon Kyu-Nam),백대현(Baek Dae-Hyun),박종호(Park Jong-Ho),한민철(Han Min-Cheol),한천구(Han Cheon-Goo) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(구조계)
For the purpose of improving the quality of FA concrete according to change in W/B, this study evaluated the effect of sodium mixture (called GA hereafter) developed by authors of a preceding study on dynamic performance and durability evaluation for FA concretes with stimulants on engineering characteristics of FA substituted concrete. The results of this study can be su㎜arized as follows. First, 15% FA mix was used as plain mix by using naphthalene mixture (called NA hereafter). Concretes with 20% FA and 25% using GA were prepared to compare accompanying characteristics to those of plain mix. As fresh concrete characteristics, flow satisfied the objective slump value with the help of satisfactory distribution of GA and improvement with substitution of FA. Particularly for W/B of 60%, slump loss was reduced by about 35~70 ㎜ in comparison to the plain mix, showing an advantage in maintenance of flow. In addition, air capacity was satisfied for the objective range in all mixes. Setting time of GA was similar to the time shown by plain mix. If GA is used, setting delay can be reduced while increasing W/B. Expression of identical compressive strength was verified by use of GA and plain mixes regardless of W/B and curing temperature as characteristics of hardened concrete. Satisfactory early strength expression is anticipated from use of GA.
조강형 혼화제에 의한 플라이애시 다량 치환 콘크리트의 품질 향상
한천구,박종호,이정아,Han, Cheon-Goo,Park, Jong-Ho,Lee, Joung-Ah 한국건설순환자원학회 2009 한국건설순환자원학회지 Vol.4 No.4
본 연구에서는 FA 다량 치환 콘크리트의 품질 개선 및 기타 품질 향상을 목적으로 선행 연구에서 개발된 조강형 혼화제(GA)로 FA 다량 치환 콘크리트의 품질 향상 가능성을 평가하였다. 실험은 우선 FA 15%를 치환한 배합에 나프탈렌계 혼화제(이하 NA)를 사용한 것을 Plain으로 하였고, FA 20, 25% 및 30%를 치환한 경우, GA를 사용하여 콘크리트의 제반특성을 Plain과 비교 실험 하였다. 굳지 않은 콘크리트 특성으로 유동성은 GA를 사용할 경우 저하하므로 그 사용량을 증가시켜주어야 하는데, 단 W/B 60%의 경우는 Plain 보다 슬럼프 로스가 약 35~70 mm 감소하여 유리한 것으로 나타났다. 공기량은 FA 사용량 증가에 따라 FA에 포함된 미연소탄분의 AE제 흡착작용에 기인하여 감소함으로서 AE제 사용을 비례적으로 증가시켜 주어야함을 알 수 있었다. 블리딩은 FA 20%에서 블리딩 발생량이 가장 적게 나타나 블리딩 저감 효과를 기대할 수 있었다. 경화 콘크리트의 특성으로 응결시간은 GA를 사용한 경우 Plain과 동등한 수준으로 나타나, 응결 지연현상을 줄일 수 있는 것으로 판단된다. 압축강도는 W/B 및 양생온도와 관계없이 GA를 사용한 경우 Plain과 동등한 강도 발현을 확인 할 수 있었으나, FA 30% 치환한 경우는 사용상에 주의가 필요할 것으로 사료된다. 동결융해 저항성은 Plain보다 초기 값이 작게 나타났으나, 전반적으로 큰 차이가 아니기 때문에 내동해성 문제가 없을 것으로 판단된다. 촉진 중성화는 GA를 사용함에 따라, FA를 다량 사용할 경우 단점으로 지적되는 중성화 취약에 대한 문제는 어느 정도 해결 할 수 있을 것으로 분석되었다. The purpose of the study was to improve quality of high volume fly ash concrete. The study evaluated on the possibility of early quality improvement of high volume fly ash concrete with early strength gain admixture ('GA' below) developed by the preceding research. The study regarded applying naphthalene admixture ('NA' below) to mix proportion substituting FA 15 % to be plain. In the event of substituting FA 20, 25 and 30 %, the study compared engineering properties of concrete with plain by applying GA. Because of features of fresh concrete, fluidity falls down when GA is applied. Therefore, its use amount shall be increased. Only, in W/B 60 %, it was beneficial since slump loss was reduced about 35~70 mm than plain. The study could see that AE use should be increased proportionally since air content was reduced by coming from AE absorption operation of unburned coal content included in FA according to an increase in the amount of FA use. Reduction effect of bleeding could be anticipated since the amount of bleeding appeared at least in FA 20 %. Because of hardened concrete, time of setting appeared in the same level as plain when GA was applied. Therefore, it is judged that delay of setting can be reduced. In compressive strength, the study could check the same strength development as plain when GA was applied, having nothing to do with W/B and curing temperature. However, it is thought that we shall pay attention to GA use in the event of FA 30 % substitution. Freezing and melting resistance had less early value than plain. However, it is judged that there will be no problem of frost resistance since there is no a large difference between freezing and melting resistance and plain in overall. In accelerated neutralization, it was analyzed that a problem of weakening in neutralization appointed as a demerit when FA was applied in mass in proportion with GA use could be settled to some extent.
손호정 ( Son Ho-jung ),이정아 ( Lee Joung-ah ),한창평 ( Han Chang-pyung ),이성연 ( Lee Seong-yeun ),양성환 ( Yang Seong-hwan ),한천구 ( Han Cheon-goo ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.2
This research analyzed the heat resistant characteristics of high strength concrete by varied thicknesses of CFT steel plate for 300×300×600 mm RC column member, and has shown the following results. As for the characteristics of unhardened concrete, the air amount and slump flow did not show any difference whether fiber is mixed, however both were shown to satisfy the target range. On the characteristics of hardened concrete, the compression strength by the ages, which is over 83.9 MPa, showed high strength range, and the case where NY+PP(0.05) fiber is mixed in showed a tendency to increase minutely compared to plane where fiber is not mixed in. As for heat resistant characteristics, the cases of 3.0 mm, 4.5 mm and 6.0 mm CFT thicknesses where fiber is not mixed in showed slight improvement of heat resistance as steel plate became thicker, but showed fracture phenomenon, and 6.0 mm thickness CFT where NY+PP(0.05) fiber is mixed in maintained the original look of test body, implying sound condition, which in turn signifies the importance of organic fiber mix-in in CFT structure as well. At this time, main bar highest temperature, 520.8℃, showed relatively good temperature history.