• Journal of the Korea Concrete Institute
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• v.13 no.3
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• pp.206-212
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• 2001

The purpose of this experimental study was to investigate the material properties of concrete surface preparator with inorganic composite, which was modified with plaster and admixture. A series of experiment were conducted to appraise the properties according to KS F 4716. The experimental results were as follows ; When the concrete surface preparator with inorganic composite was used, the hair crack and split, due to early drying shrinkage, was little. So it is superior to concrete surface preparator with cement paste plaster The bonding strength of concrete surface preparator with inorganic composite increased about 60% compared to that of concrete surface preparator with cement paste plaster. The workability of surface flatness and finishing was superior compared to that of existing concrete surface preparator. All specifications on concrete surface preparator were satisfied in the series of this experiments. Therefore, the concrete surface preparator with inorganic composite might be satisfactory applied in field due to its superior material properties.

• Magazine of the Korea Concrete Institute
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• v.8 no.3
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• pp.5-18
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• 1996

• Magazine of korean Tunnelling and Underground Space Association
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• v.20 no.4
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• pp.74-86
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• 2018

• Proceedings of the Korean Institute of Industrial Safety Conference
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• 2001.11a
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• pp.42-45
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• 2001

최근 기능 및 기술인력의 부족과 인건비 상승에 따른 공사비 증가에 능동적인 대처, 건설공사의 품질향상, 공기단축 등을 위하여 각종 건설공사 부분에서 합리화, 기계화가 활발히 진행되고 있다. 그러나 이러한 것들을 적용하기 위하여 개발된 신기술 혹은 신공법에 대한 건설기술자의 미숙지, 부적절한 시공, 무리한 적용 등의 다양한 원인이 결부되어 콘크리트구조물에서 균열발생이 발생되는 경우가 종종 발생되고 있다.(중략)

• Proceedings of the Korea Concrete Institute Conference
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• 2009.05a
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• pp.157-158
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• 2009

In this study, We analyze structural behavior feature of column under reinforced-bar and concrete strength and load conditions and analyze optimal column diameter and construction cost through parameter study. In case we use the 40MPa high strength concrete instead of 27MPa concrete in pier, the results show positive effect in appearance of pier and cost because of small column diameter and low construction cost. Also, practical effect is proved by applying this results in pier of Shin Hou Bridge on Hum-Sung ${\sim}$ Chung-Ju highway construction work.

• Korean Journal of Construction Engineering and Management
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• v.13 no.6
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• pp.24-32
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• 2012

Reinforced Concrete is the most dominant structure type for buildings in South Korea. Reinforced Concrete is one of materials having the most cost and quantity at construction projects. It is important to manage concrete quantity so that the total project cost is not affected due to underestimate or overestimate of its quantity. Generally the concrete quantity is taken-off based on the volume of the space inside forms without subtracting volumes of rebar embedded, which cannot be considered to make quite accurate results. Resource waste and extra cost due to over or under estimate of quantity occur since they cannot estimate accurate quantity at practices. Therefore, the objective of this paper is to analyze the effect of the volume for rebars embedded in reinforced concrete members. By comparing the quantity based on the existing method with the one from BIM data, it was found that about 1~2% of quantity discrepancy was observed while the typical concrete waste rate is 1 % at the current practice.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• autumn
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• pp.202-213
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• 2003

Tower Palace III project is the highest residential and commercial high-rise complex building in Korea. In order to construct a high-rise building, advanced construction and engineering technology is required. Therefore, with more developed construction and engineering technology based upon accumulated knowledge, construction speed of 13.4 days per floor including finish work was achieved in this project. To achieve this project successfully, three main advanced construction technology were applied: 1) Construction methods for 3-day cycle of structural work and curtain wall, 2) Tact scheduling method for finish work, 3) Management system of material, labor, work, and information. Also, four main engineering technology were applied: 1) New material such as high -flowing concrete and high strength concrete of 800 kgf/cm2, 2) New method such as a pipe-cooling system of a cool water circulating type, 3) Mechanical system such as smart-fan controlling kitchen-ventilation system, 4) Electrical system such as false car system.

• Land and Housing Review
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• v.4 no.2
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• pp.193-200
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• 2013

Construction duration in construction project is an important factor which affects project cost. Advanced countries have reduced project cost by time shortening. Even though domestic construction companies have tried to time shortening, they yet failed to find systematic method for time shortening. Typically, duration of structural framework is affected by stripping time of form. Therefore, it need to shorten the stripping time of form for time shortening of structural framework. In this study, specimens of high-early-strength concrete were manufactured with variety conditions and compressive strength was tested. This study proposed stripping time of side and slab forms using test results. The stripping time of form was shortened when using high-early-strength concrete in structural framework by the test results. The result of this study will be useful for time shortening of structural framework.

• Journal of the Korea Concrete Institute
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• v.16 no.5 s.83
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• pp.645-650
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• 2004

As time passes, bridge structures require extension work on bridge in use from various effects such as social economical, or traffic environment change. When the concrete is poured at the connection of extension work initial curing concrete is influenced by vibration of vehicles that are passing through the old bridge superstructure. Concrete at early curing stage in construction site should be properly protected, enough to have established sufficient integrity to withstand outside vibration, impact etc. Currently there is no standard specification or regulation in our country. In this paper, experimental variables were divided by vibration velocity and time of loading, and concrete compressive strength and bond strength were measured.

• Journal of the Korea institute for structural maintenance and inspection
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• v.6 no.1
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• pp.141-147
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• 2002

국내 주거의 주종인 아파트의 구조형식은 벽식 철근콘크리트조로 경제성 때문에 대부분 고층으로 지어지고 있다. 철근 콘크리트구조 건물을 구체공사비중 상당부분이 거푸집공사에 투입되고 있다. 구체공사의 공기(工期)는 층당 소요일수로 산정할 수 있는데 공사비 절감 및 공기단축을 통한 시공효율상의 향상을 위해서는 지주시스템의 효율적인 전용(轉用)이 필수적이라 할 수 있다. 본 연구에서는 벽식구조 아파트의 현장조사를 토대로, 현재 사용되고 있는 지주시스템 및 바닥슬래브에 대한 응력해석을 수행하고, 이를 분석하여 공기단축의 가능성을 검토하였다.