Journal of the Architectural Institute of Korea Structure & Construction (대한건축학회논문집:구조계)

Architectural Institute of Korea (대한건축학회)
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Proposal on the Evaluation Method of Segregation Resistance of Normal Strength Concrete

보통강도 콘크리트의 재료분리 저항성 평가방법 제안

  • Received : 2015.04.25
  • Accepted : 2015.07.08
  • Published : 2015.07.30
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Abstract

Since the currently used segregation evaluation method is quantitative method based on the experience of operator, it has had many difficulties to adopt for practice. In this research, as a solution of this problem, new workability performance evaluation method was suggested using the performance levels based on the evaluation index of segregation for normal concrete (EISN) quantified by the maximum-to-minimum ratio of the flow of slumped concrete by the slump test. As the results of the experiment, when the range of the slump value was 150 to 230 mm, (slump flow value was 300 to 450 mm)the evaluation method was valid. Namely, as a base of 1.09 EISN, lower and higher ranges were determined as a "good" and "segregation", respectively, and further performance leveling was suggested with 1.06 - 1.09 for III level, 1.03 - 1.06 for II level, and 1.00 - 1.03 for I level within the "good" range. Within the good conditions of concrete, the categorized performance levels were suggested with level I, II, and III for 1.00 - 1.03, 1.03 - 1.06, and 1.06 - 1.09, respectively.

Keywords

Acknowledgement

Supported by : 청주대학교 산업과학연구소

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