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Fundamental Properties of Alumina Cement Mortar by Insulation Curing Method under Low Temperature

저온환경에서 알루미나시멘트를 사용한 모르타르의 단열양생에 따른 기초물성 평가

  • Received : 2017.05.16
  • Accepted : 2017.08.16
  • Published : 2017.10.20

Abstract

In order to examine the possibility of practical use of aluminate cement concrete at low-temperature environment with insulation method, an experimental studies on flowability, setting time, freezing temperature, size variation and compressive strength of the mortar at low-temperature were conducted. Compressive strength was increased in use of CSA, aluminate cement with gypsum. Workability and physical properties were improved by using aluminate cement and gypsum. In addition, freezing resistance and physical properties were improved by applying the insulation curing method. Especially, when alumina cement and gypsum were used together, the insulation curing method was more effective in improving the compressive strength.

동절기에 콘크리트를 시공할 경우 초기동해와 강도발현이 지연되는 문제가 있으며, 이를 방지하기 위해서는 콘크리트가 동결하기 이전에 시멘트의 수화반응이 일정수준 이하 진행되는 것이 중요하다. 이에 본 연구는 저온에서도 수화열이 높게 발생되는 $Al_2O_3$성분이 함량이 높은 CSA, 알루미나시멘트를 OPC에 치환하여 물성평가를 수행하였다. 그 결과 CSA, 알루미나시멘트를 사용하여 $-5^{\circ}C$의 저온환경에서 초기에 수화반응이 빠르게 진행되며, 급결현상 및 유동성저하현상이 발생되었고, 석고를 사용하여 응결시간을 지연하며 유동성을 확보하여 작업성을 개선하였다. 또한 단열양생공법을 적용하여 모르타르의 동결시간을 지연하였으며 수축보상효과를 증진시켰고 3일, 7일 강도가 증진되었다. 따라서 본 연구 결과 저온환경에서 CSA, 알루미나시멘트 및 석고를 사용하여 조기에 강도발현 증진효과가 우수하였으며, 석고 및 단열양생공법을 적용하여 작업성, 동결저항성, 조기강도 발현 성능이 개선되어 초기동해를 방지하는데 효과가 있을 것으로 판단된다.

Keywords

References

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