Advances in concrete construction

  • 제7권3호
  • /
  • Pages.175-181
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  • 2019
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  • 2287-5301(pISSN)
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  • 2287-531X(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Effect of low-calcium fly ash on sulfate resistance of cement paste under different exposure conditions

  • Zhang, Wuman (Department of Civil Engineering, School of Transportation Science and Engineering, Beihang University) ;
  • Zhang, Yingchen (Department of Civil Engineering, School of Transportation Science and Engineering, Beihang University) ;
  • Gao, Longxin (Department of Civil Engineering, School of Transportation Science and Engineering, Beihang University)
  • 투고 : 2018.10.24
  • 심사 : 2019.03.17
  • 발행 : 2019.05.25
⟨ 이전 논문 다음 논문 ⟩

초록

Low-calcium fly ash (LCFA) were used to prepare cement/LCFA specimens in this study. The basic physical properties including water demand, fluidity, setting time, soundness and drying shrinkage of cement/LCFA paste were investigated. The effects of curing time, immersion time and wet-dry cycles in 3% $Na_2SO_4$ solution on the compressive strength and the microstructures of specimens were also discussed. The results show that LCFA increases the water demand, setting time, soundness of cement paste samples. 50% and 60% LCFA replacement ratio decrease the drying shrinkage of hardened cement paste. The compressive strength of plain cement specimens decreases at the later immersion stage in 3% $Na_2SO_4$ solution. The addition of LCFA can decrease this strength reduction of cement specimens. For all specimens with LCFA, the compressive strength increases with increasing immersion time. During the wet-dry cycles, the compressive strength of plain cement specimens decreases with increasing wet-dry cycles. However, the pores in the specimens with 30% and 40% LCFA at early ages could be large enough for the crystal of sodium sulfate, which leads to the compressive strength increase with the increase of wet-dry cycles in 3% $Na_2SO_4$ solution. The microstructures of cement/LCFA specimens are in good agreement with the compressive strength.

키워드

과제정보

연구 과제 주관 기관 : National Natural Science Foundation of P. R. China

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피인용 문헌

  1. Effect of sulfate activators on mechanical property of high replacement low-calcium ultrafine fly ash blended cement paste vol.11, pp.3, 2019, https://doi.org/10.12989/acc.2021.11.3.183