• 한국환경과학회지
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• 제24권11호
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• pp.1417-1430
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• 2015

In this study we were to explore the seasonal variation of water temperature distributions before and after weir construction at Gumi, Chilgok, Gangjung(Goryung), Dalsung in the Nakdong River using Landsat satellite images. Relationship between in-situ water temperature and radiance values of Landsat-5, 7, 8 satellite images showed high correlation. Seasonal variation of water temperature in Nakdong River showed that the fluctuation ranges of water temperature before weir construction were larger than those after weir construction. This indicated that the variation of water temperature is due to the difference of heat storage volume by weir construction and dredging work. In particular, the water temperature after weirs construction in autumn was 4-8 times lower than that before weirs construction. Water temperature after weir construction decreased in spring and summer at the downstream of Gumi weir and Gangjung(Goryung) weir, and the upstream of Dalsung weir. In autumn and winter, the water temperature after weir construction increased in the upstream and downstream of the whole weirs except upstream of Gumi weir. Relationship between water temperature and meteorological elements (air temperature, wind speed, sunshine, radiation) showed high correlation of above 94% in air temperature, and then radiation was high correlation before and after 65%.

• 국제학술발표논문집
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• The 3th International Conference on Construction Engineering and Project Management
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• pp.794-799
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• 2009

The temperature control of in-place concrete is the most important factor for an early age of curing concrete. Heat stress of mass concrete caused by the heat of hydration can induce the crack of concrete, and a frost damage from cold weather casting concrete results defect on compressive strength and degradation of durability. Therefore, success and failure of concrete work is dependant on the measurement and control of concrete temperature. In addition, the compressive strength assessment of in-place concrete obtained from the maturity calculated from the history of temperature make a reduction of construction cycle time, possible. For that purpose, wireless temperature measuring system was developed to control temperature and assess strength of concrete. And, it was possible to monitor the temperature of concrete over 1km apart from site office and to take a proper measure; mesh-type network was developed for wireless sensor. Furthermore, curing control system that contains the program capable to calculate the maturity of concrete from the history of temperature and to assess the compressive strength of concrete was established. In this study, organization and practical method of developed curing control system are presented; base on in-place application case.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2008년도 추계 학술발표회 제20권2호
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• pp.229-232
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• 2008

골조공기단축 시 양생이 충분하지 못한 RC 구조물에 시공하중이 가해질 수 있고 이러한 시공하중은 시공 중 구조물의 안전성과 사용성에 영향을 줄 수 있다. 따라서 골조공사의 공기를 단축하기 위해서는 시공하중에 대한 구조물의 안전성 및 사용성에 대한 검토가 선행되어야 한다. 최근 연구에 따르면 기준에서 정의된 시공하중 뿐만 아니라 온도하중도 시공 중인 구조물의 거동에 큰 영향을 줄 수 있는 것으로 나타났지만 기존의 시공단계해석에서는 이러한 온도하중을 합리적으로 고려하지 않고 있다. 따라서 본 연구에서는 온도하중을 고려한 시공단계해석을 수행하여 동바리 하중 변화와 슬래브 하중 변화를 분석하여 온도하중에 따른 시공 중 구조물의 거동을 분석하였다. 외부 온도변화를 고려한 시공단계해석을 수행한 결과, 주변온도가 하강할 경우 동바리 하중은 감소하고 상승할 경우는 증가하는 경향을 나타냈다. 이러한 동바리 하중 변화는 구조물의 안전성에 큰 영향을 미칠 수 있는 것으로 파악되었다. 따라서 시공계획 시 온도변화에 따른 동바리 하중 변화를 합리적으로 고려해야 한다. 또한 슬래브 하중 변화에서 온도 하강에 의해 슬래브의 모멘트가 커지는 경향을 나타냈다. 공기단축 시온도하중에 의해 증가된 모멘트는 균열모멘트를 초과할 수 있으므로 가설계획 시 온도하중을 추가적으로 고려해야 한다고 판단된다. 외부 온도변화를 고려하여 구조물의 거동을 분석한 본 연구 자료는 향후 RC 구조물의 공기단축 시, 시공 중 안전성과 건축물의 사용성 확보를 위한 가설계획에서 유용한 자료로 사용될 것으로 판단된다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2016년도 추계 학술논문 발표대회
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• pp.17-18
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• 2016

On apartment construction sites in hot weather environments, the high temperature of 30℃ and above and radiation from the sun cause iron and mold temperatures to rise, which lowers worker efficiency and has a negative effect on the deposited concrete. Therefore this study measured the temperature of D10 ~ D16 iron and aluminum items actually used on box frame apartment construction sites currently under construction, in order to give reference information to solve hot weather concrete problems. The temperature measurement results showed that for iron, temperatures rose to around 45℃, and for mold around 58.8℃, calling for safety measures for workers in case of possible burning and other problems.

• 한국안전학회지
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• 제20권2호
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• pp.91-97
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• 2005

The purpose of this study is to provide basic data for establishment of prevention counterplan against construction accidents in preparation for variation of climate conditions. In order to execution of this study, it was analyzed relations of climate factors and cases of construction accident occurred construction sites. In occurrence of construction accidents inducing death upon variation of Climate factors, precipitation and wind velocity were not related directly to construction accidents inducing death. On the other hand, the more temperature and humidity are high, the more construction accidents inducing death occurred. Especially, when temperature and humidity are above $24^{\circ}C,\;70\%$ respectively, field managers must pay attention to safety management of construction sites.

• 환경영향평가
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• 제14권3호
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• pp.135-145
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• 2005

This study was conducted to investigate the characteristics of meteorological environment variation before and after construction of Nak-dong river estuary barrage. We used meteorological data(air temperature, precipitation, relative humidity, visibility, wind) at Gimhae airport meteorological station. The construction of river estuary barrage can change climate at the neighboring districts and influence human's health and vegetable. The construction of Nakdong river estuary barrage brought rise of temperature, decrease of relative humidity and increase of poor visibility frequency.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2019년도 춘계 학술논문 발표대회
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• pp.143-144
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• 2019

This study introduces the production and construction of building interior and exterior materials using UHPC for premix type room temperature curing developed through advance research and development.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2019년도 춘계 학술논문 발표대회
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• pp.36-37
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• 2019

In domestic construction industry progress, construction and quality control of large structures are considered to be important as the superstructure and mass scale of structures. In the case of mass concrete, high hydration heat caused by cement hydration generates temperature stress by generating internal temperature difference with the concrete surface. These temperature stresses cause cracks to penetrate the concrete structure. A method of lowering the heat generation by incorporating Urea in order to reduce the concrete temperature crack has been proposed. In this study, the heat function coefficient for the FEM temperature crack analysis of the mass concrete containing the element was derived and the adiabatic temperature rise test was carried out according to the incorporation of the element. As a result of this experiment, the maximum temperature of 41 ± 1℃ was obtained irrespective of the amount of urea, and the maximum temperature decreased by 16.9℃ in concrete containing 40kg/㎥ of urea.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2016년도 춘계 학술논문 발표대회
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• pp.199-200
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• 2016

Accurate fire diagnoses are needed to properly repair and strengthen buildings affected by fire. The current diagnosis method of fire takes time and is ineffective. In previous research, Melting point temperature of each sequence to grasp easily the temperature of the concrete up to 200 ~ 600 ℃ was to estimate the temperature by utilizing a different sequence representing material.But In the form of conventional hydrothermal temperature prediction simple measuring device, it is difficult in the future buried in application to the construction site, there is a problem of damage when concrete pouring, and only the extension of life measured by the zinc has a problem does not distinguish between 400 ℃ and 500 ℃. Therefore this study is conducted by utilizing a titanium metal changes the color depending on the temperature to check for the applicability of the simple apparatus for measuring the temperature prediction sequence.

• 콘크리트학회지
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• 제8권4호
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• pp.191-199
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• 1996

매스콘크리트 시공시 콘크리트의온도가 급격히 변화하면 콘크리트에는 균열이 발생하게 된다. 매스콘크리트를 타설한 후에는 구조물의 주변환경조건이 콘크리트의 온도를 변화시키게 된다. 그러나 아직도 주변환경조건을 고려하여 콘크리트의 온도이력을 엄밀하게 해석할 수 있는 해석기법이 개발되지 않은 상황이다. 본 연구에서는 대기온도, 양생온도, 거푸집재료, 거푸집의 존치 및 제거, 추가양생 등 주변환경조건이 매스콘크리트 온도이력에 미치는 영향을 정량적으로 해석하기 위하여 유한요소정식와에 열전달계수, 주변환경조건 및 거푸집조건을 도입하였고 이를 해석할 수 있는 알고리즘과 해석프로그램을 개발하였다. 본 연구의 수치모형 해석값을 모형실험값, 타연구 모형실험값 및 기존의 범용프로그램에 의한 해석값과 비교한 결과로부터 본 연구의 온도해석이론의 타당성 및 정확도를 분석하였다.