Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
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Influence of Drying Methods on Measurement of Hydration Degree of Hydraulic Inorganic Materials: 1) Ordinary Portland cement paste and mortar

수경성 무기재료의 수화도 측정에 대한 건조방법의 영향: 1) 보통 포틀랜드 시멘트 페이스트 및 모르타르

  • 이효경 (조선대학교 건축학부 (건축공학전공)) ;
  • 김형기 (조선대학교 건축학부 (건축공학전공))
  • Received : 2018.01.12
  • Accepted : 2018.02.14
  • Published : 2018.02.28
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Abstract

The present study was carried out to find a suitable drying method for measuring non-evaporable water contents of various hydraulic inorganic materials. In Part 1 of the paper, the case Ordinary Portland cement is discussed. Various drying methods including vacuum and oven drying, and an ignition, were used for the OPC paste and mortar having different w/c. The sole vacuum drying under room temperature led a fluctuation on measurement of hydration degree, while the sole oven drying also yielded unwanted hydration promotion at the early age. A combination of the vacuum and oven drying was considered as a suitable drying method for the OPC case.

본 연구는 여러 수경성 무기재료를 사용한 배합의 고정수량 측정을 위해 적절히 사용할 수 있는 건조방법을 찾기 위해 수행되었으며, 본 제1보에서는 보통 포틀랜드 시멘트의 경우에 대해 다루었다. 다양한 w/c를 갖는 시멘트 페이스트 및 모르타르에 대해 진공건조 및 오븐건조, 이 둘의 조합 그리고 작열법이 사용되었다. 실험결과, 상대적으로 상온 진공건조 만으로는 신뢰도가 낮은 수화도 결과를 얻을 수 밖에 없으며, 오븐건조 만을 사용하면 1일 전후의 극초기 재령에 고온에서 수화촉진이 발생해 실제보다 더 큰 수화도 결과값을 얻게 되는 문제가 있음을 확인 하였다. 따라서 진공건조 후 오븐건조를 사용하는 것이 보통 포틀랜드 시멘트를 위해 바람직한 수화도 측정방법일 수 있음을 확인하였다.

Keywords

References

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