Abstract Slag-containing pastes and concretes were analysed by element-specific synchrotron-based techniques to determine the speciation of iron on crushed materials through spatially resolved micro-spectroscopic studies. The investigated cement samples were hydrated either in the laboratory, or exposed to river or sea water. Metallic iron, along with minor proportions of iron sulphide and magnetite was detected in the laboratory sample. Iron sulphide, goethite, and siliceous hydrogarnet were discovered in the blended slag cements hydrated in contact with river water for up to 7 years. In contrast, no Fe(0) was observed in blended concretes exposed to sea water. Instead, iron sulphide, iron(II)-hydroxide and -oxide, hematite, magnetite, siliceous hydrogarnet, and goethite were detected as well as ilmenite (FeTiO3) in the aggregates. The strong acceleration of Fe oxidation in samples exposed to sea water and the long-term passivation observed in the other samples indicate comparable processes as those occurring on steel bars.

中文翻译：

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高炉矿渣水泥中的铁形态

摘要 通过基于元素特定同步加速器的技术对含矿渣的糊状物和混凝土进行分析，通过空间分辨显微光谱研究确定粉碎材料上铁的形态。所研究的水泥样品要么在实验室中水化，要么暴露在河流或海水中。在实验室样品中检测到金属铁以及少量硫化铁和磁铁矿。在与河水接触长达 7 年的水化矿渣水泥中发现了硫化铁、针铁矿和硅质水石榴石。相比之下，在暴露于海水的混合混凝土中没有观察到 Fe(0)。相反，在聚集体中检测到硫化铁、氢氧化铁和氧化铁、赤铁矿、磁铁矿、硅质水石榴石和针铁矿以及钛铁矿 (FeTiO3)。