A Raman spectroscopy study of steel corrosion products in activated fly ash mortar containing chlorides

被引：38

作者：

Criado, M. ^{[1
]}

Martinez-Ramirez, S. ^{[2
]}

Bastidas, J. M. ^{[3
]}

机构：

[1] CSIC, Inst Ciencia Mat Madrid, Canto Blanco 28049, Spain

[2] CSIC, Inst Estruct Mat, E-28006 Madrid, Spain

[3] CSIC, Ctr Nacl Invest Met, E-28040 Madrid, Spain

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2015年 / 96卷

关键词：

Raman spectroscopy; Alkali activation; Fly ash; Iron corrosion products; Chloride; CONCRETE PORE SOLUTION; LONG-TERM CORROSION; PASSIVE FILM; IN-SITU; ATMOSPHERIC CORROSION; REINFORCING STEEL; IRON ELECTRODES; LOW-ALLOY; BEHAVIOR; IDENTIFICATION;

D O I：

10.1016/j.conbuildmat.2015.08.034

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Raman spectroscopy was used to characterise the corrosion products of reinforcing steel embedded in activated fly ash mortars in the presence of 0.4% and 2% chlorides. Two alkaline solutions with different soluble silica contents were utilised to activate the fly ash. Raman spectra were obtained using two excitation wavelengths (532 and 633 nm) and making power scans to select the suitable conditions of register for each wavelength. The main steel corrosion products identified were iron oxyhydroxides with low crystallinity, goethite (alpha-FeOOH) and lepidocrocite (gamma-FeOOH). These products need to be studied using a spectrometer with the laser line of 532 nm at low powers from 0.025 to 0.25 mW or a spectrometer with the laser line of 633 nm at high power between 2.5 and 25 mW. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：383 / 390

页数：8

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