Iron speciation in blast furnace slag cements
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Date
2021-02
Publication Type
Journal Article
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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.
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Publication status
published
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Journal / series
Volume
140
Pages / Article No.
106287
Publisher
Elsevier
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Edition / version
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Subject
Slag; Iron; Corrosion; XAS; Thermodynamic model
Organisational unit
03328 - Wehrli, Bernhard (emeritus) / Wehrli, Bernhard (emeritus)