Computers and Concrete

  • 제16권6호
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  • Pages.847-864
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  • 2015
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  • 1598-8198(pISSN)
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  • 1598-818X(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Modeling of damage in cement paste subject to external sulfate attack

  • Xiong, Chuansheng (College of Mechanics and Materials, Hohai University) ;
  • Jiang, Linhua (College of Mechanics and Materials, Hohai University) ;
  • Zhang, Yan (College of Mechanics and Materials, Hohai University) ;
  • Chu, Hongqiang (College of Mechanics and Materials, Hohai University)
  • 투고 : 2015.08.13
  • 심사 : 2015.12.16
  • 발행 : 2015.12.25
⟨ 이전 논문 다음 논문 ⟩

초록

This study aimed to develop models of sulfate diffusion and ettringite content profile in cement paste for the predication of the damage behavior in cement paste subject to external sulfate. In the models, multiphase reaction equilibrium between ions in pore solution and solid calcium aluminates phases and the microstructure changes in different positions of cement paste were taken into account. The distributions of expansive volume strain and expansion stress in cement paste were calculated based on the ettringite content profile model. In addition, more sulfate diffusion tests and SEM analyses were determined to verify the reliability and veracity of the models. As the results shown, there was a good correlation between the numerical simulation results and experimental evidences. The results indicated that the water to cement ratio (w/c) had a significant influence on the diffusion of sulfate ions, ettringite concentration profile and expansion properties in cement paste specimens. The cracking points caused by ettringite growth in cement paste specimens were predicted through numerical methods. According to the simulation results, the fracture of cement paste would be accelerated when the specimens were prepared with higher w/c or when they were exposed to sulfate solution with higher concentration.

키워드

과제정보

연구 과제 주관 기관 : Ministry of Science and Technology of China, National Natural Science Foundation of China

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피인용 문헌

  1. Numerical investigation on gypsum and ettringite formation in cement pastes subjected to sulfate attack vol.19, pp.1, 2015, https://doi.org/10.12989/cac.2017.19.1.019
  2. Modeling of time-varying stress in concrete under axial loading and sulfate attack vol.19, pp.2, 2015, https://doi.org/10.12989/cac.2017.19.2.143
  3. X-ray CT monitoring of macro void development in mortars exposed to sulfate attack vol.21, pp.4, 2015, https://doi.org/10.12989/cac.2018.21.4.367
  4. Effect of interfacial transition zone on the transport of sulfate ions in concrete vol.192, pp.None, 2015, https://doi.org/10.1016/j.conbuildmat.2018.10.140