Intrinsic chloride ion transport behavior in porous space of pure C-S-H
Cement and Concrete Research(2024)
摘要
Knowing the chloride ingress rate is crucial in predicting the service life of reinforced concrete in chlorine environment. While empirical diffusion model is available, fundamental knowledge of Cl− diffusion in calcium silicate hydrate (C-S-H) is largely lacking as it is experimentally challenging to prepare a bulk pure C-S-H. In this study, synthesized C-S-H powder was compacted to form pellets of controlled pore structure and Ca/Si. Effective diffusion coefficients of Cl− in these C-S-H matrixes were measured using steady-state natural diffusion and electric-migration tests, as a function of Ca/Si and porosity. Increased pore tortuosity significantly reduced diffusivity even when porosity remains nearly unchanged. The influence of pore-solution pH to Cl− diffusion is distinct between natural-diffusion and electric-migration. Our data provides the first direct measure of Cl− diffusion coefficient in pure C-S-H matrix, and new insights into the surface effect for diffusion in extremely small pores.
更多查看译文
关键词
C-S-H,Chloride ion transport,pH,Surface effect,Ca-to-Si ratio
AI 理解论文
溯源树
样例
![](https://originalfileserver.aminer.cn/sys/aminer/pubs/mrt_preview.jpeg)
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要