Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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Prediction Equation of Setting Time for Mortar Using Super Retarding Agent Using Equivalent Age

등가재령을 이용한 초지연 모르타르의 응결시간 예측식 제안

  • Han, Min-Cheol (Department of Architectural Engineering, Cheongju University) ;
  • Hyun, Seung-Yong (Department of Architectural Engineering, Cheongju University) ;
  • Kim, Jong (Department of Architectural Engineering, Cheongju University)
  • 한민철 (청주대학교 건축공학과) ;
  • 현승용 (청주대학교 건축공학과) ;
  • 김종 (청주대학교 건축공학과)
  • Received : 2022.02.25
  • Accepted : 2022.03.15
  • Published : 2022.03.30
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Abstract

This study is to provide an prediction model of setting time of super retarding mortar based on equivalent age method under various super retarding agent contents, curing temperature, and water-binder ratio (W/B). An equation for predicting setting time using maturity was proposed. Test results indicated that the setting time can be predicted by determining the curing temperature, W/B, and super retarding agent contents and substituting it into the equation proposed in this study. The coefficient of determination of the equation is 0.9 or more, and the reliability was confirmed through the F-test. Finally, using the equation proposed in this paper, reasonable quality control is possible regarding the setting of super retarding concrete in practice.

본 연구에서는 초지연제 혼입률, 양생온도 및 강도수준 변화에 따른 응결지연 특성을 실험적으로 고찰하고, 응결시간과 수화반응속도 관점에서 이들의 영향을 정량적으로 평가할 수 있는 적산온도를 이용한 응결시간 예측식을 제안하고자 하였다. 그 결과, 양생온도, 강도수준(물결합재비) 및 초지연제 혼입률을 결정한 뒤 본 연구에서 제안한 모델식에 대입하면 응결시간을 예측할 수 있다. 모델식의 경우에는 결정계수가 0.9 이상으로 나타났으며, F-검정을 통해 그 신뢰성을 확인하였다. 최종적으로 본 논문에서 제안한 모델식을 활용하면 실무에서 초지연 콘크리트의 응결과 관련하여 합리적인 품질관리가 가능할 것으로 판단된다.

Keywords

Acknowledgement

본 논문은 2021년 한국연구재단의 개인기초연구사업(중견연구)(과제번호:NRF-2021R1A2C2011273)의 지원을 받아 수행된 연구입니다.

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