Nina Gartner (Author), Miha Hren (Author), Tadeja Kosec Mikić (Author), Andraž Legat (Author)

Abstract

Alkali-activated materials (AAMs) present a promising potential alternative to ordinary Portland cement (OPC). The service life of reinforced concrete structures depends greatly on the corrosion resistance of the steel used for reinforcement. Due to the wide range and diverse properties of AAMs, the corrosion processes of steel in these materials is still relatively unknown. Three different alkali-activated mortar mixes, based on fly ash, slag, or metakaolin, were prepared for this research. An ordinary carbon-steel reinforcing bar was installed in each of the mortar mixes. In order to study the corrosion properties of steel in the selected mortars, the specimens were exposed to a saline solution in wet/dry cycles for 17 weeks, and periodic electrochemical impedance spectroscopy (EIS) measurements were performed. The propagation of corrosion damage on the embedded steel bars was followed using X-ray computed microtomography (XCT). Periodic EIS measurements of the AAMs showed different impedance response in individual AAMs. Moreover, these impedance responses also changed over the time of exposure. Interpretation of the results was based on visual and numerical analysis of the corrosion damages obtained by XCT, which confirmed corrosion damage of varying type and extent on steel bars embedded in the tested AAMs.

Keywords

korozija;alkalijsko-aktivirane malte;armaturno jeklo;elektrokemijska impedančna spektroskopija;rentgenska računalniška mikrotomografija;vizualna analiza;odprti dostop;corrosion;alkali-activated mortars;steel reinforcement;electrochemical impedance spectroscopy;X-ray computed microtomography;visual analysis;open access;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: ZAG - Slovenian National Building and Civil Engineering Institute
Publisher: Molecular Diversity Preservation International
UDC: 620.1/.2
COBISS: 88913923 Link will open in a new window
ISSN: 1996-1944
Views: 20
Downloads: 4
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Metadata: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Other data

Secondary language: Slovenian
Secondary keywords: korozija;alkalijsko-aktivirane malte;armaturno jeklo;elektrokemijska impedančna spektroskopija;rentgenska računalniška mikrotomografija;vizualna analiza;
Source comment: Nasl. z nasl. zaslona; Opis vira z dne 10. 12. 2021; Št. članka 7366;
Pages: str. 1-14
Volume: ǂVol. ǂ14
Issue: ǂiss. ǂ23
Chronology: 2021
DOI: 10.3390/ma14237366
ID: 19478719