Proceedings of the Korean Institute of Building Construction Conference (한국건축시공학회:학술대회논문집)

The Korean Institute of Building Construction (한국건축시공학회)
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A Study on Sodium Sulfate Activited the Hydration Properties of Fly Ash-cement Paste

황산염나트륨 자극제를 사용한 플라이 애쉬 혼입 시멘트 페이스트의 초기 수화 특성에 관한 기초적 연구

  • 왕자호 (한양대학교 스마트시티학과) ;
  • 순양 (한양대학교 스마트시티학과) ;
  • 이한승 (한양대학교 건축학부)
  • Published : 2021.05.20
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Abstract

In order to solve the problem of low early-age compressive strength of high volume fly ash concrete. This paper studies the effect of 2% sodium sulfate (Na2SO4) as a chemical activator on the paste with 40% fly ash content and a water-binder ratio of 0.30. The results indicate that the addition of Na2SO4 can effectively improve the early-age compressive strength of the fly ash-cement system, and the strength improvement rate on the first day reached nearly 70%. In addition, calorimetric analysis reveals that the incorporation of Na2SO4 promotes the early hydration of cement and fly ash, increases the cumulative hydration heat and delays the heat peak of the aluminum phase.

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Acknowledgement

This research was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (No. 2015R1A5A1037548).