Computers and Concrete

  • 제32권1호
  • /
  • Pages.45-60
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  • 2023
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  • 1598-8198(pISSN)
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  • 1598-818X(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Numerical simulation on integrated curing-leaching process of slag-blended cement pastes

  • Xiang-Nan Li (Department of Civil Engineering, School of Science, Nanjing University of Science & Technology) ;
  • Xiao-Bao Zuo (Department of Civil Engineering, School of Science, Nanjing University of Science & Technology) ;
  • Yu-Xiao Zou (Department of Civil Engineering, School of Science, Nanjing University of Science & Technology) ;
  • Guang-Pan Zhou (Department of Civil Engineering, School of Science, Nanjing University of Science & Technology)
  • 투고 : 2021.12.10
  • 심사 : 2023.03.21
  • 발행 : 2023.07.25
⟨ 이전 논문 다음 논문 ⟩

초록

Concrete in water environment is easily subjected to the attack of leaching, which causes its mechanical reduction and durability deterioration, and the key to improving the leaching resistance of concrete is to increase the compaction of its microstructure formed by the curing. This paper performs a numerical investigation on the intrinsic relationship between microstructures formed by the hydration of cement and slag and leaching resistance of concrete in water environment. Firstly, a shrinking-core hydration model of blended cement and slag is presented, in which the interaction of hydration process of cement and slag is considered and the microstructure composition is characterized by the hydration products, solution composition and pore structure. Secondly, based on Fick's law and mass conservation law, a leaching model of hardened paste is proposed, in which the multi-species ionic diffusion equation and modified Gérard model are established, and the model is numerically solved by applying the finite difference method. Finally, two models are combined by microstructure composition to form an integrated curing-leaching model, and it is used to investigate the relationship between microstructure composition and leaching resistance of slag-blended cement pastes.

키워드

과제정보

The study of this paper is financially supported by the National Natural Science Foundation of China (52078252, 51778297), Natural Science Foundation of Jiangsu Province (BK20200494) and Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX21_0289).

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