• 제목/요약/키워드: concrete quality

검색결과 2,018건 처리시간 0.037초

파이넥스 수쇄 슬래그 잔골재의 혼합률에 따른 콘크리트의 품질특성 평가 (Evaluation of Quality Properties of Concrete according to Mixing Proportion of Finex Water Granulated Slag Fine Aggregate)

  • 최연왕;조봉석;오성록;박만석
    • 한국건설순환자원학회논문집
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    • 제2권2호
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    • pp.145-151
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    • 2014
  • 본 연구에서는 국내에서 발생되고 있는 파이넥스 수쇄 슬래그를 콘크리트용 잔골재로써 활용하기 위한 연구의 일환으로 파이넥스 수쇄 슬래그 잔골재의 기초물성을 평가하였으며, 파이넥스 수쇄 슬래그 잔골재를 사용한 굳지않은 콘크리트의 특성, 경화된 콘크리트의 역학적 특성을 보통강도 및 고강도 영역에서 강사와 비교 평가하여 콘크리트용 잔골재로써 사용성 검토를 수행하였다. 실험결과, 파이넥스 수쇄 슬래그를 사용한 콘크리트와 강사를 사용한 콘크리트의 품질특성은 동등수준인 것으로 나타났다.

고객요구에 따른 한중레미콘 품질의 영향 (Influence of Cold weather Ready Mixed Concrete Quality according to Needs of Customer)

  • 조일호;양재성;김성욱
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2001년도 봄 학술발표회 논문집
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    • pp.647-650
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    • 2001
  • The purpose of this study was the influence of cold weather ready mixed concrete quality according to needs of customer were investigated by measurements of slump, air content, temperature and compressive strength. As a results, cold weather ready mixed concrete using high standard admixtures, high early strength admixtures and cold weather concrete plant were similarly to slump, air content, temperature and compressive strength.

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650kgf/$\textrm{cm}^2$ 고강도 콘크리트 한중 시공사례 (Field Application of High Strength Concrete under Cold Weather Conditions)

  • 정재동;노재호;한정호;조일호
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 1994년도 봄 학술발표회 논문집
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    • pp.260-265
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    • 1994
  • High strength concrete(65MPa) was used for construction of the bulk cement storage silo by using sliding form. This paper presents mix design, production, quality control and experience with field application of high strength concrete under cold weather conditions. It is shown to be possible to produce high strength concrete of compressive strength of 50~60 MPa by using high-range water reducer to lower w/c ratio with appropriate quality control.

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자극제를 이용한 플라이애쉬 콘크리트의 품질 향상에 관한 연구 (The Study of Quality Improvement of Fly Ash Concrete U sing Activator)

  • 박종호;김정빈;정용;박봉순;이정아;한천구
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2009년도 춘계 학술대회 제21권1호
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    • pp.349-350
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    • 2009
  • 자극제를 이용한 플라이애쉬 콘크리트의 품질 향상에 관한 연구 결과 자극제를 이용하여 굳지 않은 콘크리트 특성 변동 없이 압축강도를 향상 시킬 수 있는 것으로 나타났다.

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건축자재 활용을 위한 순환골재 콘크리트의 품질개선 방안 연구 (A study on the quality improvement plan of recycled aggregate concrete for the use of building materials)

  • 김태현;홍성인;최윤정;안재홍
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2022년도 봄 학술논문 발표대회
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    • pp.162-163
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    • 2022
  • Recycled aggregate has structural limitations in that it cannot be actively used for use as a structural building material due to quality deviations such as increase in cracks, decrease in constructability during in-situ casting, and decrease in strength. Although the government gives incentives to use recycled aggregate concrete for major structural parts of buildings to revitalize recycled aggregate concrete, there is a perception that the quality control of recycled aggregate producers that produce raw materials is insufficient. In this study, recycled aggregate, I checked the quality of the company that handles the quality. We are working on this.

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현장 타설용 콘크리트의 시공품질 검토를 위한 연구 (A Study on Construction Quality Inspection of Field use Concrete)

  • 김민석;강병훈;강태경;박선길;이종균;정상진
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2000년도 가을 학술발표회 논문집(II)
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    • pp.1057-1062
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    • 2000
  • The purpose of this study is to practice the method which can estimate 28-days strength of concrete in advance. This method is made for reliant quality control. Based on existing experiment, concrete that flyash added and normal concrete are placed into wall structure, and it is examined the difference between experiment use concrete and field use concrete. The result of this study are as follows : 1) Core test specimen have 10% lower strength to standard curing specimen. 2) At 28-days accelerated strength by microwave, average 35% in normal concrete, average 23% in flyash added concrete. 3) At coefficient of determination between compressive strength and accelerated strength, 0.84 in normal concrete core, 0.86 in standard curing normal concrete, 0.86 in flyash added concrete, 0.90 in standard curing flyash added concrete.

혼화재를 사용한 고강도콘크리트의 품질개선에 관한 실험적 연구 (An Experimental Stud on The Quality Improvement of High Strength Concrete using Mineral Admixtures)

  • 류영호;박정국;이보근;박칠림
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 1993년도 봄 학술발표회 논문집
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    • pp.79-88
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    • 1993
  • The purpose of this study is to provide a firm base for the quality improvement of high strength concrete and the development of ultra high strength concrete as well as enviromental con-servation and utilization of byproducts from industrial processing such as Fly ash and Silica fume. A comprehensive experimental study was performed to investigate the effects on the quality improvement of high strength concrete using mineral admixtures. As results, 400~500kg/$\textrm{cm}^2$ compressive strength and excellent flowability can be obtained if fly ash is replaced with cement in the range of 305. In case of using powder type silica fume, 600~700 kg/$\textrm{cm}^2$ compressive strength is showed and 600~800kg/$\textrm{cm}^2$ compressive strength cam be obtained with liquid type silica fume. But it is necessary to increase dosage of high range water reducer for flowability using powder type silica fume. Especially, higher strength concrete cam be obtained when maximum size of coarse aggregate is lower than 25mm.

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전기저항 및 유전율을 이용한 모래의 함수율 측정에 관한 연구 (The Study on Evaluation of percentage of water content using electric resistivity and dielectric constant)

  • 김화중;박정민;김태곤;최신호;이승조
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 1995년도 봄 학술발표회 논문집
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    • pp.118-123
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    • 1995
  • Evaluating the moisture content for sand is useful for quality cotnrol of concrete. If water content of evaluate instantly and apply for mix proportion sand of concrete, in mixing propertion of concrete, it can makes to improve of concrete quality. In this study, the evaluating method for moisture content of sand, using the electric velocity and dielectric constant was proposed as a study of quality control of concrete. The obtained results are summarized as follow. The resistance ratio was decreased as the increase of moisture content The dielectric constant was decreased as the sand of the moisture content increase.

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해양콘크리트의 품질관리 방안 및 마감성 개선에 관한 연구 (A Study on the Quality Control and the Finishability Improvement of Durable Marine Concrete)

  • 유재강;김영진;정기성;임현칠
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2006년도 춘계학술발표회 논문집(I)
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    • pp.614-617
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    • 2006
  • This study investigates the quality control and the finishability improvement properties of durable marine concrete under construct in Geo-je Ka-duk fixed link project. Below $3.5\times10^{-12}m^2/s$ chloride migration coefficient and above 40MPa compressive strength are required for the caisson structure concrete. The quality control was performed from physical-chemical analysis of raw materials to concrete test. Also, the efficiency of vibration type and action interval were tested to remove the entrapped air on the faced to form. And kinds of form and remolding agent were also tested. This paper aim to enhance the practical use of high performance concrete to construction field.

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지표투과레이더와 적외선카메라를 이용한 아스팔트 포장 시공 관리 방법 (Construction Management Method for Asphalt Paving Using Ground Penetrating Radar and an Infrared Camera)

  • 백종은;박희문;유평준;임재규
    • 한국도로학회논문집
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    • 제17권6호
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    • pp.1-9
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    • 2015
  • PURPOSES : The objective of this study is to propose a quality control and quality assurance method for use during asphalt pavement construction using non-destructive methods, such as ground penetrating radar (GPR) and an infrared (IR) camera. METHODS : A 1.0 GHz air-coupled GPR system was used to measure the thickness and in situ density of asphalt concrete overlay during the placement and compaction of the asphalt layer in two test construction sections. The in situ density of the asphalt layer was estimated based on the dielectric constant of the asphalt concrete, which was measured as the ratio of the amplitude of the surface reflection of the asphalt mat to that of a metal plate. In addition, an IR camera was used to monitor the surface temperature of the asphalt mat to ensure its uniformity, for both conventional asphalt concrete and fiber-reinforced asphalt (FRA) concrete. RESULTS : From the GPR test, the measured in situ air void of the asphalt concrete overlay gradually decreased from 12.6% at placement to 8.1% after five roller passes for conventional asphalt concrete, and from 10.7% to 5.9% for the FRA concrete. The thickness of the asphalt concrete overlay was reduced from 7.0 cm to 6.0 cm for the conventional material, and from 9.2 cm to 6.4 cm for the FRA concrete. From the IR camera measurements, the temperature differences in the asphalt mat ranged from $10^{\circ}C$ to $30^{\circ}C$ in the two test sections. CONCLUSIONS : During asphalt concrete construction, GPR and IR tests can be applicable for monitoring the changes in in situ density, thickness, and temperature differences of the overlay, which are the most important factors for quality control. For easier and more reliable quality control of asphalt overlay construction, it is better to use the thickness measurement from the GPR.