• 한국건축시공학회지
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• 제7권1호
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• pp.115-121
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• 2007

Ordinary concrete uses aggregate sufficiently soaked with water, and is weighed, mixed with other materials and placed in accord with performances required in the construction field. Recently special concrete with high fluidity and durability is required but it is difficult to use top-quality concrete due to lack of high-quality aggregate, delayed transportation because of traffic jam, etc. In addition, sometimes the use of a remicon is inevitable just for small-sized concrete constructions or it is difficult for a remicon to reach remote construction places such as mountainous areas. To solve these problems, this study attempted to pack concrete materials. In other words, it is to instantize concrete. This study dried aggregate, a material of concrete, and compared the change of absorption phase of the aggregate in water and in paste in order to examine the effect of the dryness of aggregate on its absorption rate and, based on the absorption rate, decided water addition ratio necessary for the reduction of unit quantity caused by the use of dry aggregate in designing concrete mixture, and analyzed the properties of unhardened concrete according to water addition ratio in manufacturing concrete using aggregate in the state of absolute dryness and in the state of surface dryness.

• 한국건축시공학회지
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• 제10권4호
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• pp.113-122
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• 2010

In this study, 150MPa ultra-high-strength concrete was manufactured, and its performance was reviewed. As technically meaningful autogenous shrinkage reportedly occurs at a W/B ratio of 40% or less, although it occurs in all concrete regardless of the W/B ratio, the effects of the use of expansive admixture and shrinkage reducer, or of the friction and restraint of forms that may result in the effective reduction of autogenous shrinkage, were reviewed. As a result, considering the flow and strength characteristics, it was found that the slump flow time was shorter with expansive admixture, and shortest with shrinkage reducer. All specimens with $30kg/m^3$ expansive admixture showed high strength at early material age. Their strength decreased due to the expansion cracks when there was excessive use of expansive admixture, and the use of shrinkage reducer did not influence the change in the strength according to the material age. The expansive admixture had a shrinkage reduction effect of 80%, while the shrinkage reducer had a shrinkage reduction effect of 30%, indicating that the expansive admixture had a stronger effect. It seems that mixing the two will have a synergistic effect. The shrinkage reduction rate was highest when the W/B ratio was 20%. The form suppressed the expansion and shrinkage at the early period, and the demolding time did not significantly influence the shrinkage. The results of the study showed that the excessive addition of expansive admixture leads to expansion cracks, and the expansive admixture and shrinkage reducer have the highest shrinkage reduction effect when they are mixed.

• 한국건설순환자원학회논문집
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• 제6권4호
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• pp.229-235
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• 2018

본 연구에서는 순환골재 콘크리트의 품질안정화를 목표로 기술 개발한 골재 혼합설비를 활용하여 순환골재 및 천연골재를 사전 혼합하였으며, 생산 된 혼합골재를 적용하여 혼합 전과 혼합 후의 콘크리트 특성을 검토하였다. 이렇게 도출된 결과를 토대로 순환골재의 품질 안정화 및 사용 활성화를 위한 새로운 방향을 제시하고자 하였다. 골재 혼합 전 후에 따른 믹서로 비빈 굳지 않은 콘크리트 중의 모르타르와 굵은 골재량의 변화율 시험 결과 사전 골재 혼합 시 혼합 전 콘크리트 대비 모르타르 및 굵은 골재량의 편차가 줄어드는 것으로 확인되었다. 재령 3일과 재령 7일에서의 압축강도 편차 및 평균압축강도는 혼합 전 후 비슷한 결과를 나타냈으며, 28일 강도에서는 재령 3, 7일보다 혼합 전 후 강도 편차가 크게 발생했다. 사전 골재 혼합을 통한 혼합골재 사용 시 강도 편차가 줄어드는 것으로 확인되었으며, 사전 골재 혼합을 통한 혼합골재 사용 시 장기강도 발현이 유리할 것으로 사료된다. 위의 결과를 토대로 순환골재 및 천연골재 사전 혼합을 통해 생산된 혼합골재를 사용한 콘크리트 결과 굵은골재량, 압축강도 편차가 줄어드는 것으로 나타나 사전 골재혼합을 통해 균질한 콘크리트를 생산할 수 있는 것으로 판단된다. 이는 생산되는 순환골재 특성에 따라 천연골재와 사전 혼합을 통해 균질한 골재 특성을 맞춰 생산할 수 있으며, 순환골재의 문제점 중 하나인 품질편차를 해결할 방안으로 고려된다.

• 건축역사연구
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• 제27권3호
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• pp.27-42
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• 2018

This study aims to reinterpret Jeonggwanheon(靜觀軒) in terms of its use and architectural style after restoration work through the recently discovered [Deoksugung Palace's original plan](1915). It is presupposed that the existing interpretation of Jeonggwanheon, such as its status as the banquet hall of the Imperial Empire and the place where Emperor Gojong enjoyed coffee here, was a fantasy made from the transformation after the 1930s. When it was built around 1900, Jeonggwanheon arranged small and large rooms around the corridor in the center, and the porch surrounded the three sides of the building. From 1900 to 1907, there is no remaining record telling us who did what or when something happened in Jeonggwanheon except for several portraits of Emperor Gojong and his son which were drawn in 1902. The mixed use of brickwork and wooden porch are found in many of American style houses built in Incheon and Seoul at that time. Especially, the style and decoration of wooden porch seem to be influenced by Queen Anne style in the 19th century in America.

• 국제초고층학회논문집
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• 제12권1호
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• pp.63-74
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• 2023

Large-capacity public transportation systems, represented by urban metro lines, are the key to alleviating the significant increase in urbanization and motorization in China. But to improve the agglomeration effect of metro stations in a more accurate and targeted way requires scientific evaluation and classification of the surrounding areas of metro stations. As spatial and functional design are the core factors for urban renewal design, this study took Beijing as an example, using multi-source data to evaluate the morphology and functional composition surrounding areas of metro stations, and the Boston Consulting Group (BCG) matrix was used to classify and characterize each type of surrounding areas from morphological-functional dimensions. It shows a negative correlation of the mix-use index with the floor area ratio, and only about 20% of the areas achieve the ideal situation of high construction intensity with high mix-use diversity. Hoping to provide a reference for city managers and designers in dealing with the surrounding metro stations with different construction intensities in a more precise way.

• 한국조경학회지
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• 제38권2호
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• pp.109-118
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• 2010

본 연구는 랜드스케이프 어바니즘을 적용한 도시재생적 실천전략을 모색하기 위해 연구되었다. 특히, 랜드스케이프 어바니즘을 산업사회를 넘어 지식정보산업사회의 도래와 함께 나타나는 도시화의 새로운 특성과 양상, 또 산업화시대의 신도시 이상을 넘어 도시재생이라는 새로운 도시 이상과의 상관성 맥락에서 도시재생에 어떻게 적용할 것인가의 관점에서 수행되었다. 본 연구의 결과, 랜드스케이프 어바니즘에서의 랜드스케이프의 의미가 도시를 대상으로 시각적, 장식적 차원의 정태적 풍경이 아니라, 변화, 진화 등의 맥락에서 동태적 과정을 대상으로 하고 있고, 지식정보산업사회가 지식 정보의 흐름 등 가속적 변화와 과정적 특징을 보이며, 이러한 사회적 특징에 따라 도시화도 형태와 기능 중심에서 흐름, 네트워킹, 중심성과 결절성, 지표면 등의 개념으로 구성되는 가치지향의 과정적, 동태적 특성을 보인다는 점에서 이들 3자간에는 그 본질적 개념에 있어 상호 관통되고 소통되고 있는 것으로 나타났다. 특히, 산업화시대의 도시화에 대한 반성으로서 21세기 새로운 도시이상으로서 대두되고 있는 도시재생은 본질적으로 아스팔트와 콘크리트로 점유된 도시 경관판을 그린 인프라 구축과 디자인이라는 맥락에서 생태판에 문화를 도입한 문화판으로 구축해야 한다는 당위성에서 랜드스케이프 어바니즘과 일정의 괘를 같이 하고 있었다. 본 연구에서 제시된 랜드스케이프 어바니즘을 적용한 8개의 도시재생전략으로는 도시가 자연과 역동적으로 소통하고 진화할 수 있는 생태판의 구축, 생태와 도시민과의 소통을 위한 생태판의 문화판으로의 전환, 주택 및 상업지역에서의 그린 인프라 구축 등의 관점에서, 건폐율 규제, 높이 규제 완화 등의 필요성이 제시 되었다. 또한, 도시이전적지의 공원화, 하천 등 도시워터프론트의 공원화 등의 전략에서 공원의 도시적 관입 및 확산과 더불어 공원혼합용도에 대한 도입이 논의되었다. 이러한 새로운 경관판을 형성하기 위한 실행전략으로 사회의 변화에 역동적으로 부응할 수 있는 전략계획제의 도입이 논의되었고, 특히, 이미지니어링을 통한 가치계획을 추구함으로써 기능중심의 도시화에서 가치창출과 브랜드형성 차원의 도시화로 진화시켜 나아가야 할 것을 제시하였다. 이 모든 전략을 위해 기존의 경관, 토지이용 등 건축 및 도시개발 관련 각종 제도가 개선되어야 할 것으로 제안되었다.

• 한국건축시공학회지
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• 제7권4호
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• pp.153-159
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• 2007

Recently, as a result of the economic growth, the concentration of population towards the cities and the rise in land prices, the demand for high rise buildings has increased significantly, the trend to build high rise buildings such as the mixed-use development buildings by the domestic construction companies continues. It's very important what kind of form work system is applied on the Core Wall of the high rise buildings to determine the economic efficiency for the whole project. That's because the appropriate selection of the Formwork system enables the construction cost lower, makes the good quality of the finished concrete, reduces the construction period, assurance of safety, and further more, it enables to achieve the successful performance of the projects. Therefore, this research, after comparing the strength and the weakness between the construction methods, focus the point to provide a builder the basic data to choose the right Formwork method.

• 한국실내디자인학회논문집
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• 제24권3호
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• pp.197-204
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• 2015

This study investigated the characteristics of architectural planning in the youth training centers, which were introduced to the magazines from 2000 to 2010. The result are as followings. Firstly, the youth training centers were located mainly in general residential area, that the youth could be easily accessible. And, it were located mainly in green natural area, which is adjacent to the mountain or park. The site area of the youth training center was analyzed to approximately $10,000m^2$ below. Secondly, the placement and the form of the youth training center is divided two types, which are a single and two buildings type. A single building case is found the type of 'ㄴ' and 'ㄷ' shape, and two buildings case is found the type of 'ㄴ + ㅡ', 'opened ㅁ', 'ㅡ + ㅡ' shape. It is found mostly the type of 'ㄷ' shape. Thirdly, the youth training center is planned mostly with fifth stories above ground and three underground levels. And, sometimes it is planned a mixed-use buildings with a sports center, community center and senior welfare center. Lastly, the space of youth training center is zoned horizontally for each mass of building, which is planned the educational, cultural and sports facilities. And, it is zoned vertically some of the sports facilities and administrative support facilities in the underground, and a educational and cultural facilities on the ground.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2006년도 춘계학술논문 발표대회 제6권1호
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• pp.23-26
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• 2006

The study about the concrete to use recently a light weight aggregate, processed actively. And concrete pumping with a high pressure pump has been popularized, the mechanical development, such as high pressure pumps or pipes, is progressing rapidly. Concrete placing by pumping has the advantage of the reduction of the construction period with workability, easiness of work and the increase of placing, but the quality variation of concrete is caused by pumping is seldom considered, including the increase of the pipe length by high-rising and large-sizing, there by the loss of the unit quantity of water, with pumpability or workability deteriorated. In this research, we will compare and analyze before pumping and after pumping samples of ready-mixed light weight concrete. The result of study as follow. The case of a light weight concrete which the low slump is more decrement compared with high slump light weight concrete in after pumping samples. After pumping the water by pressure of a pump was absorbed to the aggregate inside, and it showed an increase of compression strength about $5{\sim}20%$.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2007년도 춘계학술논문 발표대회
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• pp.67-70
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• 2007

As construction industry is requiring competitive power and technique in national construction market with rapid fluctuation of construction environment and development, requirements upgrading performance in construction materials are increasing. But, national lightweight aggregate and lightweight concrete's inappropriateness when produced are also increasing. And there are not international standard of aggregates in using these construction materials because standards and characteristics of aggregate in each countries are different. Therefore, in this study, lightweight aggregate acquired due to wide range of use is tested and mixed for concrete to gain practicality and set the authorized manual in international. Also, basic data will be proposed to set a standard for concrete by analyzing lightweight aggregate characteristics. When lightweight aggregate absorptivity is high, concrete shows low strength and when it's density is low, concrete shows low weight of unit volume. Furthermore, compressive strength of lightweight aggregate is steep in first and longtime material age is tendency to cause low strength increasing rate.