The influence of silicon on the formation and transformation of corrosion products

IF 10.9 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Fabio E. Furcas , Shishir Mundra , Barbara Lothenbach , Camelia N. Borca , Thomas Huthwelker , Ueli M. Angst
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Abstract

Accurate model predictions of corrosion-driven damage in reinforced concrete structures necessitate a comprehensive understanding of the rate of corrosion product formation. Here, we investigate the influence of dissolved Si characteristic of cementitious systems on the rate of corrosion product transformation at alkaline pH. Compared to systems aged in the absence of Si, small amounts of Si decrease the formation rate of the thermodynamically stable corrosion product goethite by a factor of 10. The estimated first order rate constant of transformation k decreases exponentially as a function of the dissolved Si concentration and follows the progression log10k=log10k0 14.65×[Si]0.28. Findings further suggest that the observed retardation is primarily due to the formation of a mobile aqueous Fe-Si complex. The concentration of Si in cementitious systems has a crucial influence, and additional research is required to fully incorporate this factor into reactive transport models, ultimately essential for accurate service life predictions.

硅对腐蚀产物的形成和转化的影响
要对钢筋混凝土结构中的腐蚀驱动破坏进行准确的模型预测,就必须全面了解腐蚀产物的形成速率。在此,我们研究了水泥基体系的溶解硅特性对碱性 pH 下腐蚀产物转化率的影响。与不含硅的老化体系相比,少量硅会使热力学稳定的腐蚀产物网纹石的形成速率降低 10 倍。估计的转化一阶速率常数 k 与溶解的硅浓度成指数关系,并遵循 log10k=log10k0- 14.65×[Si]0.28。研究结果进一步表明,观察到的延缓主要是由于形成了流动的水性铁-硅复合物。硅在水泥基体系中的浓度具有至关重要的影响,需要进行更多的研究,以便将这一因素充分纳入反应迁移模型,最终实现准确的使用寿命预测。
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来源期刊
Cement and Concrete Research
Cement and Concrete Research 工程技术-材料科学:综合
CiteScore
20.90
自引率
12.30%
发文量
318
审稿时长
53 days
期刊介绍: Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.
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