• Title/Summary/Keyword: 한상묵

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An Experimental Study on the Properties of High Volume Reclaimed Coal Ash Concrete (매립석탄회 고배합 콘크리트의 특성)

  • 한상묵;이종림;하재담;김태홍
    • Proceedings of the Korea Concrete Institute Conference
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    • 2003.11a
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    • pp.7-10
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    • 2003
  • The amount of coal ash has been increasing and development of effective use is urgently needed. Various by-products and waste are expected to be used as resources from the point of reduction in environmental load. This is an experimental study to compare the properties of high volume coal ash concrete using the reclaimed coal ash. For this purpose, the mix proportion of concrete according to the content ratio of below 5mm reclaimed coal ash (0.65, 0.70, 0.75 and 0.80). And then air content, slump, compressive strength test were performed. According to test results, it was found that the compressive strength of reclaimed coal ash concrete was similar to the content ratio of below 5mm reclaimed coal ash. And the slump of reclaimed coal ash concrete decreased as the content ratio of below 5mm.

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The Experimental Study of Behaviors in Prestressed Concrete Beam made of Ultra High Performance Cementitiou Composites without Stirrups (초고성능 섬유보강 시멘트 복합체로 제작된 전단보강이 없는 PSC 보의 거동에 대한 실험적 연구)

  • Kang Su Tae;Park Jung Jun;Ryu Gum Sung;Koh Kyung Taek;Kim Sung Wook;Han Sang Muk
    • Proceedings of the Korea Concrete Institute Conference
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    • 2005.11a
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    • pp.403-406
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    • 2005
  • Ultra high performance cementitious composites(UHPCC), which is composed of micro-sized ultra fine particles, is characterized by high strength, high ductility and excellent durability. so if we make prestressed concrete bridge girder using UHPCC, we can obtain the safety and economical efficiency in bridge girder construction. In this study, we performed the experiments to evaluate the load capacity, failure process and mode of prestressed concrete without stirrups using UHPCC.

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A Proposal of the Compressive Stress Distribution Model of Ultra High-Strength Concrete (초고강도 콘크리트에 적합한 응력분포 모델의 제안)

  • 박훈규;윤영수;한상묵;장일영
    • Proceedings of the Korea Concrete Institute Conference
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    • 1997.10a
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    • pp.436-441
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    • 1997
  • This paper presents the compressive stress distribution model appropriate to predict the ultimate strength of structural elements using ultra high-strength concrete. From the results of this investigation, the following conclusions are drawn: 1. The constant value of strain at extreme concrete compression fiber of 0.0027 is seen to represent satisfactorily the experimental result for ultra high-strength concrete. 2. The current ACI-318 rectangular stress block parameters were found to overestimate the moment capacity of ultra high-strength concrete columns with eccentrically loaded. 3. The equivalent trapezoidal stress distribution model with new parameter $\lambda_1$ and $\lambda_2$ was developed.

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Study of Light Weight Concrete Using Aggregate of Waste Plastic Materials (폐플라스틱 제품의 골재를 이용한 경량 콘크리트에 관한 연구)

  • 한상묵;조명석;송영철
    • Proceedings of the Korea Concrete Institute Conference
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    • 2003.05a
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    • pp.7-12
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    • 2003
  • In scrapped material field, about ten millions ton of waste plastic materials are produced in korea. However recycling rate of waste plastic materials have above 25%. Therefore, it is urgently needed that they are used as recycled materials in order to prevent environment pollution and grain economic profits. In this paper, physical and mechanical properties of light weight concrete using waste plastic materials for aggregates are described in order to develop a light weight concrete with the aggregate made from waste plastic goods, it was carried out many experiments on mix proportion and strength. According to the experimental results, high-strength mortar was necessary to make light weight concrete using aggregate of waste plastic materials. Especially, considering the side of recycling of plastic wastes, it is recommended that recycled aggregates made from waste plastic materials is applied to light weight concrete.

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A Study on the Strength and Ductility Effect of High-Strength Concrete Columns Confined by Tied Hoops (띠근에 의한 고강도 콘크리트 기둥부재의 강도 및 연성효과에 관한 연구)

  • 박훈규;송재호;한상묵;장일열
    • Proceedings of the Korea Concrete Institute Conference
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    • 1998.10b
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    • pp.609-614
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    • 1998
  • Lateral pressure by tied reinforcement greatly enhances the maximum strength and ductility of columns under concentric loading. The lateral confinement effects will be improves ductility of high-strength concrete. The major purpose of this paper is to study on the improvements of maximum strength and strain at the point of tied high-strength concrete columns subject to axial loads. For this purpose, this study collected the other analytical results and the experimental data that has been performed by a lot of worldwide researchers and also analyzed it statistically. As the result, the theoretical equation for predict maximum strength and strain at the point was proposed. It is based on calculation of lateral confinement pressure generate from tensile that develop in transverse reinforcement.

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A Comparative Study on the Elastic Modulus Equations for High-Strength Concrete (고강도 콘크리트에 대한 탄성계수식 비교연구)

  • 박훈규;윤영수;한상묵;장일영
    • Proceedings of the Korea Concrete Institute Conference
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    • 1996.10a
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    • pp.239-244
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    • 1996
  • The aim of this study is to present the elastic modulus equation that suits to a domestic situation to coincide the improved mechanical properties of high-strength concrete. For this purpose, this study collected the laboratory data more than 400 connected with the modulus of elasticity that performed in this country and also compared with the existing equations compressive strength of investigated concrete ranged from 400 to 1, 400kg/$\textrm{cm}^2$. As a result, it could confirm that the existing equations which were proposed by the ACI 363R. CEB-FIP, NS 3473, and New-RC have a tendency to the overestimation in general.

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A Experimental Study on the Freezing and Thawing of High-Strength Light Weight Aggregates Concrete (고강도 경량골재콘크리트의 동결융해에 대한 실험적 연구)

  • 박정권;최세규;한상묵;김생빈
    • Proceedings of the Korea Concrete Institute Conference
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    • 1997.04a
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    • pp.155-161
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    • 1997
  • This Expriment is performed to describe the properties of the freezing-thawing and to find the method to enhance the freezing-thawing resistance of the high strength light weight aggregates concrete. For this purpose, we made 8 kinds of specimen of concrete mold. The light weight coarse aggregate concrete which contained AE was appeared in good condition and its durability index was more than 90% by the buffer action which owing to entained air. The light weight aggregates concrete which admixture of silca fume, was appeared that the durability index was 46.74% in spite of its high strength. I might conclude that the most important factor for freezing-thawing resistance of high strength light weight aggregate concrete is the entrained air.

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Development and Operation of Durability Mock-Up Test Facilities for Offshore Electricity Structures (해상 전력구조물 내구성 실증 실험장 구축 및 운영)

  • Pang Gi-Sung;Han Sang-Mook;Song Young-Chul;Kwon Byeong-Soo
    • Proceedings of the Korea Concrete Institute Conference
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    • 2005.05b
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    • pp.265-268
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    • 2005
  • This paper discusses a strategy and status for development and operation of durability mock-up test facilities for offshore structures. The strategy is examplified and facilitated using an offshore transmission tower crossing the West sea and the Shihwha lake, which was designed and constructed 345kV T/L lines transmitting power from Yeong-Heung fossil power plant to Seoul metropolitan area. Various data for corrosion protection, aging, life-prediction of concrete and steel offshore structures can be obtained using the proposed mock-up test facility. Acquired data will be used for further research on durability, life-prediction, and retrofit of structures. It is important to maintain the safety of 345 kV Yeong-Heung transmission line crossing the Shihwha lake because the offshore structure is one of the critical electric facilities transmitting large power to the metropolitan area. Operation of the offshore transmission tower mock-up is expected to make a significant contribution to stable power supply.

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Development of manufacturing technology of Artificial Reef Mixed with Reclamation Coal Ash (매립석탄회를 활용한 인공어초 제조기술 개발)

  • Han Sang-Mook;Cho Myoung-Suk;Song Young-Chul
    • Proceedings of the Korea Concrete Institute Conference
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    • 2005.05b
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    • pp.125-128
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    • 2005
  • Coal ash, which is generated as a byproduct at a coal thermal power plant, can be classified into fly ash and bottom ash. Most of fly ash is recycled as an admixture for concrete, while bottom ash is not recycled but dumped into an ash landfill disposal site. So, if a technology for recycling bottom ash efficiently, which is increasingly generated year by year, is not developed, environmental problems will take place as a matter course and further an enormous economical cost will be required for construction of additional ash landfill disposal sites. In this study an optimum mix proportion design and a quality control method for utilizing the reclamation coal ash as an aggregate for secondary concrete products such as an artificial reef was successfully developed.

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Development of manufacturing technology of Wave Dissipating Block with industrial byproduct (산업부산물을 활용한 소파블럭 제조기술 개발)

  • Han Sang-Mook;Cho Myoung-Suk;Song Young-Chul
    • Proceedings of the Korea Concrete Institute Conference
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    • 2005.05b
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    • pp.129-132
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    • 2005
  • Reclamation coal ash, which is generated as a byproduct at a coal thermal power plant is not recycled but dumped into an ash landfill disposal site. Furthermore, various byproducts and wastes have been proposed for use from the point of reduction in the environmental load. Authors have started research to develope manufacturing technology of concrete mixture design method with large amount of land reclamation coal ash. In this study an optimum mix proportion design for utilizing the reclamation coal ash and containing copper slags as an aggregate for secondary concrete products such as a wave dissipating blocks was successfully developed.

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