Journal of the Korea Institute of Building Construction (한국건축시공학회지)

The Korean Institute of Building Construction (한국건축시공학회)
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Estimation of Setting Time of Super Retarding Mortar Using Settimeter

세티메타를 이용한 초지연 모르타르의 응결시간 추정

  • Jeong, Yeong-Jin (Dept. of Architectural Engineering, Cheong-ju University) ;
  • Hyun, Seung-Yong (Construction Certification Center, Korea Institute of Civil Engineering and Building Technology) ;
  • Han, Jun-Hui (Dept. of Architectural Engineering, Cheong-ju University) ;
  • Kim, Jong (Dept. of Architectural Engineering, Cheong-ju University) ;
  • Han, Min-Cheol (Department of Architectural Engineering, Cheong ju University)
  • Received : 2023.10.05
  • Accepted : 2023.11.04
  • Published : 2023.12.20
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Abstract

This study investigates the delay in setting characteristics of mortar influenced by variations in super retarding agent(SRA) content, curing temperature, and strength levels. Utilizing a settimeter, the research introduces an objective approach to accurately determine the setting time of concrete with SRA under diverse environmental and material mixing conditions at construction sites. The findings indicate that the settimeter, in conjunction with a nonlinear regression model, can effectively estimate the setting time of super retarding mortar. Optimal management of the initial setting is recommended at approximately 45ST and the final setting around 80ST. This methodology enables more effective quality control in the setting times of super retarding concrete.

본 연구에서는 모르타르 조건하에서 초지연제 혼입률, 양생온도 및 강도수준 변화에 따른 응결지연 특성을 고찰하고자 하였으며, 세티메타를 이용하여 공사현장의 다양한 외기조건 및 재료배합 조건하에서 초지연제를 사용한 콘크리트의 응결시간을 효율적으로 추정할 수 있는 객관적 방법을 제시하고자 하였다. 그 결과, 비선형 회귀모델의 추정식 및 세티메타을 이용하여 초지연 모르타르의 응결시간을 추정할 수 있을 것으로 사료되며, 초결은 45 ST, 종결은 80 ST 전후로 관리하는 것이 바람직할 것으로 판단된다. 또한, 이를 통해 초지연 콘크리트의 응결시관과 관련한 효율적인 품질관리가 가능할 것으로 사료된다.

Keywords

Acknowledgement

This paper was conducted with the support of the National Research Foundation of Korea's Individual Basic Research Program(Mid-Career Research)(Project Number: NRF-2021R1A2C2011273) in 2021.

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