• 레미콘
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• no.4 s.55
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• pp.39-53
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• 1998

• Proceedings of the Korean Institute of Building Construction Conference
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• 2016.05a
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• pp.9-10
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• 2016

This study is purposed to review the confirm method of pumping efficiency using the concrete flow table test in Korea environment. This test method is registered as the "EN 12350-5, Testing fresh concrete. Flow table test" in Eurocode. When applying this test in the Korea construction environment, we reviewed that reasonably apply on the Korean construction Environment. As a result, test results analysis showed that the reality looks a big difference. Its cause is believed to be due to the shape of coarse & fine aggregate. But it will be better predict method, through the correlation analysis of construction data and the standard(Placing Concrete by pumping Methods(ACI Manual of concrete Practice 304.2R-96)).

• Magazine of RCR
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• v.13 no.4
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• pp.54-60
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• 2018

• Proceedings of the Korean Institute of Building Construction Conference
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• 2023.05a
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• pp.239-240
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• 2023

In this study, concrete pumpability was investigated using a sliding pipe rheometer when the slump was different, and the cause was analyzed by comparing the actual field pump pressure. As a result of the experiment, it was found that the concrete pumpability was greatly affected by the slump measurement value.

• Journal of the Korea Institute of Building Construction
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• v.10 no.5
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• pp.113-119
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• 2010

Fire resistance and field tests for high-strength concrete(HSC) of 80MPa were carried out to evaluate whether or not it shows the same material properties even in the field condition of being mass-produced and supplied. As a result, it was found that fire resistant HSCs containing composite fiber(NY, PP) of 0.075% have great resistance to fire and spalling. In the field test, before the pumping air contents, slump flow, U-box, L-flow, compressive strength, gap of hydration temperature of interior and exterior of specimen and placing ratio per hour satisfied the required properties of HSC. However, after the pumping of HSC, as slump flow and L-flow were slightly less than required criterion, they need to be improved. In terms of hydration temperature of HSC, it was found to satisfy the related criterion. Packing ability as well as placing ratio per hour of HSC, which was about $44m^3$, show outstanding results. If slump flow of developed ternary HSC is improved after the pumping it can be useful for the construction of high-rise buildings.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.1393_1395
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• 2009

지중송전라인에서 전압등급의 상승은 선로손실을 줄이면서 밀집된 전력수요에 대응하거나 특별히 고전압 수요를 맞추기 위한 것으로 이것은 XLPE Cable의 제조기술이 향상되면서 지속적으로 진행되어온 초고압송전계통의 일반적 추세이다. 이러한 경향으로 국내에서는 지중송전선로로서 최고전압인 345kV가 시공되어 운전중에 있으며 해외에서는 220kV~275kV급을 넘어서 400kV급 초고압케이블라인의 수요가 증가하고 있는데, 이러한 지중송전라인의 초고압화는 높은 신뢰성이 함께 요구되며 특히 접속재 분야에서 매우 높은 신뢰성이 요구된다. 당사는 UAE 400kV AL TAWEELAH Project에 400kV XLPE 1Cx630SQ 광복합 초고압송전라인을 준공하였는데 본고에서는 여기에 적용된 400kV XLPE 1Cx630SQ 광복합 케이블 부속재의 신뢰성을 높이기 위한 설계방법, 시험 및 시공에 대하여 요약하였다.

• The magazine of the Korean Society for Advanced Composite Structures
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• v.5 no.3
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• pp.38-52
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• 2014

도시주민생활에 없어서는 안 될 주요한 사회간접자본시설인 하수도, 하수도처리시설 등의 콘크리트 구조물에 대한 부식열화는 현재 세계 각국에서 급속히 진행되고 있다. 콘크리트 구조물은 반영구적인 것으로 인식하고 있다. 그러나 각종 열화 인자에 의해 구조물의 사용수명은 급속히 단축된다. 하수시설 내에서는 황산이외에도 다양한 염류에 의하여 콘크리트구조물이 부식될 가능성이 있지만 황산에 의한 부식이 가장 대상범위가 넓고 부식속도가 빠르기 때문에 부식현상이 발견되면 급속하고 적절한 대응조치가 필요하다. 열화예측결과 및 구조물의 공용연수를 감안한 신뢰성이 높은 공법의 도입이 필요하며 이러한 조건에 적합한 유기재료와 무기재료의 복합 특성을 발휘하는 갱생공법에 사용되는 주요 소재의 실험적 특성에 관하여 고찰하였다. 그 결과 경질염화비닐(이하 프로파일)은 내외수압 저항성에서 3분간 $1kgf/cm^2$의 압력에도 누수 및 압력의 이동이 없었으며 약품침지에 따른 중량변화량이 $0.2mg/cm^2$이하로 산에 대한 변화량은 거의 없었다. 주입재인 모르타르의 산성에 대한 저항성은 일반 콘크리트에 비해 우수하였으며 기존 모르타르에 비해 비확선성 또한 우수하였다. 장거리압송시험은 200m까지 안정적인 압송이 가능하여 이 기술에 필요한 요구 성능을 확보한 것으로 나타났다.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2009.05c
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• pp.69-73
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• 2009

Plan of concrete pumpability test or the theoretical character knowledge in the mechanic is become accomplished with character. But the character knowledge of the concrete is not considered appropriately, The theoretical background and assumed fact is a little different representative characteristic of the concrete. Concrete pumping experiment result it leads consequently and is produced the coefficient of friction which in concrete type and sending in more pressure it follows changes must grasp the tendency which. But until currently the majority experiment and research did not pass by this process. Grasps the coefficient of friction change tendency which it follows in concrete type and when pumping concrete more pressure data fundamentally from the experimental research which it sees consequently under providing the man with underdeveloped genital organ.

• 전기의세계
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• v.21 no.2
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• pp.47-51
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• 1972

한전은 앞으로의 전력수요의 증가에 대처하기 위해 전력계통망의 강화, 전력공급의 경제성향상등을 목표로 하여 345KV 초고압송전전압을 채택하였다. 345KV초고압설비의 절연조합전반에 대해서는 한전내 각부서에서 검토하고 있을것으로 알며 여기서는 345KV 송전선로의 절연설계만을 지난 71년 10월 "345KV 송전선 Insulator string검토"회의에서 논의결정된 바에 따라 종합하였다. 본고에서는 송전선로의 절연설계는 내개폐 Surge설계, 내뢰설계 내오손설계를 종합하여 결정되며, 이 방법에 의해서 345KV 송전선로의 애자개수 및 Horn간격을 결정해본다.간격을 결정해본다.

• Journal of Animal Environmental Science
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• v.11 no.1
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• pp.25-34
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• 2005

The study aimed to develop a tractor drawn animal slurry manure sub-soil injector for arable land and thus, can reduce the waste management cost through effective treatment and utilization of animal slurry manure. The application of animal slurry manure to agricultural land will probably be one of the most effective ways to enrich the soil with vital nutrients. However, some existing slurry manure spenders are not suitable in the field because of their adverse effects to the environment. Based on this premise, a prototype was designed and assembled using 5 sub-soiling standards attached to the sin injector device. The traction force of the Prototype measured in the depth of 10 cm and 15 cm from the ground surface of a paddy field was 1,062 kgf and 1,214 kgf, respectively. A unique feature of the machine was that there was an equal volume of slurry manure flowing from each delivery pipe and regulated by a pressurized container that was likewise synchronized with the speed of the tractor The sub-soiling manure injection system can mitigate or reduce the harmful emission of obnoxious gases and malodor during the injection operation.