• Title/Summary/Keyword: 노출콘크리트

Search Result 511, Processing Time 0.031 seconds

A Study on the Defects of Exposed Concrete Finishing Work Using AHP (AHP기법을 활용한 노출콘크리트 마감공법 하자 도출)

  • Choi, Seongmi;Song, Yeongwoong;Lee, Kiseok;Yoo, Seonghoon;Choi, Yoonki
    • Korean Journal of Construction Engineering and Management
    • /
    • v.20 no.4
    • /
    • pp.46-55
    • /
    • 2019
  • The exposed concrete has been widely used in building construction. Therefore, many researches are presented to secure a proper construction quality of exposed concrete. Low quality and management absence, however, still remained in construction fields. Thus, many studies have been conducted to improve the quality, but defects still occur in the exposed concrete finishing work. In this study, the causes of defects were analyzed by process in order to prevent the generation of defects and to enhance the need for integrated management to secure quality. In addition, a case study and AHP analysis have derived the importance of defects occurring in the exposed concrete finishing work. The study concluded that the occurrence of the exposed concrete finishing work needs to be managed throughout the process, not the management limited by one process, according to the causes of the existing defects, and integrated management is required to prevent defects and improve quality of exposed concrete finishing work.

The Design and Construction Management of Exposed Concrete Finish Work through the Construction Process Analysis (노출콘크리트 마감공법의 시공 프로세스 분석을 통한 설계 시공관리 방안)

  • Song, Young-Woong;Choi, Yoon-Ki
    • Korean Journal of Construction Engineering and Management
    • /
    • v.6 no.6 s.28
    • /
    • pp.160-170
    • /
    • 2005
  • Because designers want to express various elevation, architectural concrete has recently paid attention to finish material and has increasingly used in the construction. architectural concrete needs more careful and professional supervision works such as controling quality of color, texture, construction plan, and design plan. none the less, It is not clear to define process and manage methods for the construction life-cycle, which causes the expense to increase and the quality to be poor. this study will analyze concrete finish method by dividing three parts which are common, exposed and architectural concrete finish method. definition and the limit of application in architectural concrete finish method will be present by comparing three methods. Throughout an interview with a staff in charge and a case study, this paper shows the requirement and the keynote of management which are divided by three steps; the design, construction and maintenance. finally, this research provides management methods of individual steps for effective construction.

An Experimental Study and Field Application of Exposed Concrete (노출 콘크리트 실험 및 현장 적용)

  • 신성우;안종문
    • Magazine of the Korea Concrete Institute
    • /
    • v.13 no.4
    • /
    • pp.46-53
    • /
    • 2001
  • 노출 콘크리트는 별도의 마감없이 콘크리트 면이 외부에 노출되는 특성상 최적의 품질을 가지는 콘크리트를 제조.시공하여야하는데 이러한 노출 콘크리트는 제조 및 시공 방안이 까다로울 뿐만 아니라 그 내용이 각국 소속 회사의 기술 보유 차원에서 보호되고 있어 기술 도입이 어려운 점 이외에도 시멘트, 골재 등 국산 재료 사용과 시공 방안에 근거한 국내 실정에 적합한 제조 시공 기술과 이를 위한 시방서의 제작이 필요한 시점에 있다. 또한 국내의 경우에도 2002년 월드컵 부산, 광주(<사진 1>), 서귀포 경기장(<사진 2>)등등의 경기장 건설에 노출 콘크리트를 사용하여 콘크리트 마감을 실시하고 있는 등 노출 콘크리트에 대한 요구 및 사용이 증가하고 있는 실정이다. 따라서 본고에서는 경부고속철도 천안역사나 제주월드컵경기장, 그리고 부산 아시안경기 주경기장에 노출 콘크리트를 적용하기 위한 실험 및 현장 적용 사례를 소개한다.

An Experimental Study on Quality Control Standards of Exposed Concrete in Construction Stage (노출콘크리트 시공단계 품질관리 기준에 관한 실험연구)

  • Jeong, Jae-Soo;Lee, Chan-Sik
    • Korean Journal of Construction Engineering and Management
    • /
    • v.13 no.2
    • /
    • pp.48-57
    • /
    • 2012
  • A variety of studies on concrete have been performed to examine the advantages for structural material, but less attention has been paid to the contribution of concrete to finishing. Due to this matter, specific management guidelines for construction and quality on exposed concrete have not been clearly established despite more construction cost and quality control are required. This study analyzed a impact factors on the quality by survey of the existing research and practice. Field tests were performed using mock-up models to analyze the quality of exposed concrete according to form manufacture method, concrete mix proportion, and concrete placing method. Results indicate that the quality of exposed concrete was determined by concrete mix proportion and construction managements. Guidelines of quality control on exposed concrete in construction stages were proposed.

A Study on the Quality Properties of Exposed High Fluidity Concrete using Fly Ash and Limestone Powder (플라이애시 및 석회석 미분말을 사용한 고유동 노출 콘크리트의 품질특성에 관한 연구)

  • Choi, Yun-Wang;Oh, Sung-Rok;Kim, Ji-Hoon;Kim, Kyung-Hwan
    • Journal of the Korean Recycled Construction Resources Institute
    • /
    • v.1 no.1
    • /
    • pp.67-75
    • /
    • 2013
  • Recently, the interest is increasing about the exposed concrete, accordingly, exposed concrete is expanding the use. However, concrete structures is difficult to apply the general concrete for exposed concrete, due to complex section and compact reinforcement, increasingly. Therefore, in this paper, for application of high fluidity concrete as exposed concrete, exposed high fluidity concrete using fly ash and lime stone powder was manufactured and observed quality property(fluidity properties, mechanical properties and Surface Properties) of exposed high fluidity concrete. The experiments are based on the OPC and LSP10, was evaluated Impact on the quality of concrete according to mixing ratio of FA(0, 10, 15 and 20). As a result, fluidity properties, mechanical properties and Surface Properties of exposed high fluidity concrete were satisfied to requirement conditions, fluidity and surface finishability was improved depending on mix of fly ash and limestone powder. Through this, we utilize of basic research data for development of high fluidity concrete for exposed concrete.

A Study on the Optimum Mix and Exposing Method of the Fine-Size Exposed Aggregate PCC Pavements (소입경 골재노출콘크리트포장의 최적 배합 및 노출기법에 관한 연구)

  • Kim, Young-Kyu;Lee, Seung-Woo;Yoo, Tae-Seok;Kim, Hyung-Bae
    • International Journal of Highway Engineering
    • /
    • v.11 no.2
    • /
    • pp.1-15
    • /
    • 2009
  • Surface of exposed aggregate concrete pavements is consists of exposed coarse aggregate by removing upper 2$\sim$3mm mortar of concrete slab. Exposed aggregate concrete pavements have advantages of maintaining low-noise and adequate skid-resistance level during the performance period. In order to provide the successful exposed concrete aggregate pavement, uniform distribution of the coarse aggregate on pavement surface through adequate the mix design and exposing method. The mix design in concrete pavement is generally designed on the basis of strength, but mix design of exposed aggregate pavement employed in this study includes the consideration of noise and skid resistance, as well as strength. Smaller of maximum coarse aggregate is known to be effective for reduce noise level. Optimum mix design and exposing method of fine-size exposed aggregate portland cement concrete pavement that can reducing the noise and maintain the adequate level of skid resistance are proposed in this study. To consider the variation of optimum exposing time due to the hardening speed of mortar by climatic condition, quantitative is also suggested measurement of hardening state.

  • PDF

Initial Performance Evaluation of Fine-size Exposed Aggregate PCC Pavement by Experimental Construction (시험시공을 통한 소입경 골재노출 콘크리트포장의 초기 공용성 평가)

  • Kim, Young-Kyu;Choi, Don-Hwa;Lee, Seung-Woo;Kim, Hyung-Bae
    • International Journal of Highway Engineering
    • /
    • v.12 no.1
    • /
    • pp.87-98
    • /
    • 2010
  • Surface of fine-size exposed aggregate Portland cement concrete pavements is consists of exposed coarse aggregate by removing upper 2~3mm mortar of concrete slab. Fine-size exposed aggregate PCC pavements have advantages of maintaining low-noise and adequate skid-resistance level during the performance period. In order to provide the successful exposed concrete aggregate pavement, uniform distribution of the coarse aggregate on pavement surface through adequate the mix design and exposing method. In this study, evaluated initial performance of fine-size exposed aggregate PCC pavement by experimental construction. And it was known that fine-size exposed aggregate concrete pavement which can reduce the noise and maintain the adequate level of skid resistance and strength.

Penetration of De-icing Salt in Bare Concrete Bridge Decks in Highways (고속도로 콘크리트 노출 바닥판에서의 제설 염화물의 침투 특성)

  • Suh, Jin Won;Ku, Bon Sung;Rhee, Ji Young
    • Journal of the Korea institute for structural maintenance and inspection
    • /
    • v.11 no.2
    • /
    • pp.85-92
    • /
    • 2007
  • In 1980s, a number of bridges with bare concrete deck were constructed on the Korea highway. After 20 years service, many bare concrete decks are still in good condition without special maintenance activity. Therefore, the application of the bare concrete deck is being reestimated from the view of construction and maintenance. As a part of the program, the characteristic of penetration(surface chloride and apparent diffusion coefficient) of de-icing salt into bare concrete bridge deck was analyzed in order to predict the service life of bridge on Korea highway.

A Study on Field Application of 150MPa Ultra Strength Surface-Exposed Concrete (150MPa급 초고강도 노출콘크리트의 현장적용에 관한 연구)

  • Kong, Tae-Woong;Lee, Soo-Hyung;Jang, Jae-Hwan;Lee, Han-Baek
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 2008.04a
    • /
    • pp.989-992
    • /
    • 2008
  • In this paper, we are presenting a case that integrates ultra high strength concrete(150MPa) with surface-exposed concrete. Ahead of the field application, we carried out laboratory experiment and B/P Test for a basic property of concrete(slump flow, air content, 50cm flow time, elapse time change and compression strength) and productivity. The next, we conducted Mock-up Test using simulation specimen to evaluate infilling, surface-finishing and hydration heat of concrete. We had satisfactory results for a basic property and hydration heat of concrete. However at the time of field application, it was occurred rupture of formwork because of high lateral pressure of concrete, and then formwork was reinforced and case-in-place time was adjusted. And regardless of low and high frequency vibration, it occurred to surface-pockmark. In case that applies ultra high strength concrete to surface-exposed concrete, we estimate that it is important of systematic management and improvement of construction.

  • PDF

The mold form coating material research for the exposure concrete surface control (노출콘크리트 표면처리를 위한 거푸집 코팅재료 연구)

  • Lee, Young-Do
    • Journal of the Korea Institute of Building Construction
    • /
    • v.10 no.5
    • /
    • pp.137-143
    • /
    • 2010
  • This research is a comparative analysis of the surface gloss of concrete depending on the coating material added to the cast, and includes analyses of the surface gloss of specimens made of cement mortar, with and without the addition of superplasticizer. In terms of coating material, the 7th material, which is part of a liquid packaging material, was shown to have the highest gloss, and was followed by the 3rd material, which uses transparent film. As the level of gloss is shown to vary depending on the material used for the coating film, it can be interpreted that the surface gloss can differ depending on surface particles and chemical composition factors. To make a concrete surface smooth, it is more effective to use a coating material with impermeability and a highly dense surface.