The present study advances the understanding of deterioration progress in concrete foundations containing iron-sulfide bearing aggregates through electrochemical accelerated testing, coupled with non-destructive damage evaluation. The method addresses the challenge of time constraints in conventional laboratory studies by expediting the iron-sulfide oxidation process and subsequent concrete deterioration mechanisms in a controlled environment. Concrete cylinders cast in the laboratory and cored from an affected foundation in the field were subjected to the acceleration method under varied applied voltage and electrolyte exposure. Samples with iron-sulfide aggregates showed field-typical signs of deterioration within days to weeks, while those without these aggregates did not exhibit any measurable damage. The deterioration progressed with increased exposure time and applied voltage, evidenced by visual observation, quantified by decreased resonance frequency and increased total crack length. Complemented by microstructural and phase analyses, the results showed the successful accelerated replication of pyrrhotite oxidation and subsequent concrete deterioration.

中文翻译：

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含硫化铁骨料混凝土加速劣化的电化学研究


本研究通过电化学加速测试与无损损伤评估相结合，加深了对含有硫化铁骨料的混凝土地基劣化进展的理解。该方法通过在受控环境中加速硫化铁氧化过程和随后的混凝土劣化机制，解决了传统实验室研究中时间限制的挑战。在实验室浇筑并在现场从受影响的地基中取芯的混凝土圆柱体在不同的施加电压和电解质暴露下进行了加速方法。含有硫化铁聚集体的样品在几天到几周内表现出现场典型的恶化迹象，而那些没有这些聚集体的样品则没有表现出任何可测量的损坏。随着暴露时间和施加电压的增加，劣化不断进展，通过目视观察证明，通过共振频率降低和总裂纹长度增加来量化。辅以微观结构和相分析，结果表明磁黄铁矿氧化和随后的混凝土劣化成功加速复制。