Please use this identifier to cite or link to this item:
Title: Iron speciation in blast furnace slag cements
Authors: Mancini, A.
Lothenbach, B.
Geng, G. 
Grolimund, D.
Sanchez, D. F.
Fakra, S. C.
Dähn, R.
Wehrli, B.
Wieland, E.
Keywords: Corrosion
Thermodynamic model
Issue Date: 1-Feb-2021
Publisher: Elsevier Ltd
Citation: Mancini, A., Lothenbach, B., Geng, G., Grolimund, D., Sanchez, D. F., Fakra, S. C., Dähn, R., Wehrli, B., Wieland, E. (2021-02-01). Iron speciation in blast furnace slag cements. Cement and Concrete Research 140 : 106287. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
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. © 2020 The Author(s)
Source Title: Cement and Concrete Research
ISSN: 0008-8846
DOI: 10.1016/j.cemconres.2020.106287
Rights: Attribution 4.0 International
Appears in Collections:Elements
Staff Publications

Show full item record
Files in This Item:
File Description SizeFormatAccess SettingsVersion 
10_1016_j_cemconres_2020_106287.pdf3.58 MBAdobe PDF



Google ScholarTM



This item is licensed under a Creative Commons License Creative Commons