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2015 Vol.31, Issue 10 Preview Page
Analysis of Influential Factors on Compressive Strength of Concrete Specimens Obtained from a Drilled Shaft Construction Site

현장타설말뚝 콘크리트 공시체 압축강도 데이터 분석을 통한 강도 영향인자 분석

Kicheol Lee1
,
Moonkyung Chung2
,
So Yeun Kim3
,
Dongwook Kim4*
이 기철1
,
정 문경2
,
김 소연3
,
김 동욱4*
1Graduate Student, Dept. of Civil and Environ. Eng., Incheon National Univ.
2Senior Research Fellow, Geotech. Research Eng. Div., KICT
3Assistant Prof., College of Business Management, Hongik Univ.
4Assistant Prof., Dept. of Civil and Environ. Eng., Incheon National Univ.
1인천대학교 건설환경공학과 석사과정
2한국건설기술연구원 지반연구소 선임연구위원
3홍익대학교 상경대학 금융보험학전공 조교수
4인천대학교 건설환경공학과 조교수
*교신저자. *Corresponding Author. 
31 October 2015. pp. 37-47
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Abstract

Recently, the quality of drilled shafts concrete has been improved significantly due to the improved concrete performance, upgraded concrete materials, and better management of on-site constructions. Despite the development, current conventional quality management on concrete constructions is still used without any criticism. In this study, compressive strength test results of more than 200 concrete specimens after 7 and 28 days of curing were collected from one site at Songdo area of Incheon. The concrete specimens were prepared from the concrete with aggregate maximum dimensions of 25 mm, target compressive strength of 40 MPa, and slump of 180 mm. Influential factors including concrete temperature, air temperature, amount of slump, amount of air, amount of salinity on concrete specimen were also examined. The database was established from collected information and statistical analyses were performed. Analyzed results confirm that “the difference between concrete temperature and air temperature” has the largest impact on the compressive strengths of specimens at the durations of 7 and 28 days.

Keywords
Drilled shaft
Specimen
Compressive strength
Temperature
Amount of slump
Amount of air
Amount of salinity
Correlation analysis

최근 콘크리트의 성능 향상 및 현장 공사 품질관리 개선으로 인해 현장타설말뚝의 콘크리트 품질이 많이 향상되었지만 아직까지도 콘크리트에 대하여 기존에 보수적인 품질관리 기준을 적용하고 있다. 본 연구에서는 콘크리트 타설시 슬럼프량, 염분량, 공기량, 외기온도 등이 콘크리트 공시체 강도에 미치는 영향을 분석하였다. 이를 위해서 인천 송도지역 기초시공현장에서 6개월 이상 동안 시공된 현장타설말뚝 타설시 제작한 공시체 200개 이상의 자료를 분석하여 데이터베이스를 구축하고 통계 분석하였다. 굵은 골재 최대치수 25mm, 압축강도 40MPa, 슬럼프 180mm 기준으로 배합한 콘크리트 공시체 자료로부터 재령일별 압축강도 분포와 외기온도, 콘크리트 온도, 슬럼프, 공기량, 염분량 등의 인자가 콘크리트 압축강도에 미치는 영향을 조사하였다. 조사 결과 “콘크리트 타설시 콘크리트 온도와 외기온도의 차이”가 공시체 7일과 28일 압축강도에 미치는 영향이 가장 큰 것으로 확인되었다.

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Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 31
  • No :10
  • Pages :37-47
  • Received Date : 2015-08-19
  • Revised Date : 2015-09-14
  • Accepted Date : 2015-09-14
  • DOI :https://doi.org/10.7843/kgs.2015.31.10.37
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