Sulfate diffusivity altered by pore crystallization due to chemical sulfate attack of cement-based materials

Conference paper (2021)

Authors

Bo Ran Tsinghua University, China
Othman Omikrine Metalssi Université Paris-Est, France
Teddy Fen-Chong Université Paris-Est, France
Patrick Dangla Université Paris-Est, France
Kefei Li Tsinghua University, China - Université Paris-Est, France
Copyright: © 2021 the authors
Cement Pore refinement External sulfate attack Pore crystallization
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Published Date

29-04-2021

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Abstract

Three models are proposed for the sulfate diffusivity change due to the pore clogging by crystallization from the chemical sulfate attack of cement-based materials. The averaging model takes a linear relationship between the crystallization quantity and diffusivity change while the constriction model takes an inverse linear form and the self-consistent scheme model lies in between. These models are integrated into a diffusion-reaction model for chemical sulfate reactions in cement-based materials and solved numerically. The results show that all the three models can capture the rapid self-deceleration of sulfate ingress by fitting different relative kinetic coefficients k/D0 and reduction parameters θ.