Abstract
The significance of the chloride ion diffusion rate cannot be overstated when evaluating the durability of concrete structures. Nonetheless, conventional techniques employed for determining the chloride ion diffusion coefficient in concrete, particularly in the case of seawater and sand concrete (SSC), are prone to inaccuracies due to the inherently elevated levels of inherent chloride ions present within SSC. This research introduces a fresh approach for precisely ascertaining the chloride ion diffusion rate within SSC, addressing this issue. Based on the ion concentration gradient conversion mechanism, an exfiltration method was established, and a corresponding apparatus was developed. The study also investigates the effects of W/C, fly ash content, and LC2 content on chloride ion leaching behavior of SSC. Additionally, the determination of the chloride ion diffusion coefficient and the evaluation of SSC's resistance to chloride ingress were carried out by employing Fick's second law in conjunction with analyzing chloride ion profiles following sample submersion.
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