INFLUENCE OF MODERN CONCRETE MICROSTRUCTURE ON THE DIFFUSION OF CORROSION AGENTS

1 NOVÁKOVÁ Radka
Co-authors:
1 KOUŘIL Milan 2 DOBIÁŠ Daniel 1 SEDLÁŘOVÁ Ivona 1 STOULIL Jan
Institutions:
1 University of Chemistry and Technology, Prague – Department of Metals and Corrosion Engineering, Prague, Czech Republic, EU
2 Czech Technical University in Prague – Klokner Institute, Prague, Czech Republic, EU
Conference:
25th Anniversary International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 25th - 27th 2016
Proceedings:
Proceedings 25th Anniversary International Conference on Metallurgy and Materials
Pages:
1127-1132
ISBN:
978-80-87294-67-3
ISSN:
2694-9296
Published:
14th December 2016
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
47 views / 15 downloads
Abstract

The durability of reinforced concrete structures is limited mainly by the reinforcement material, as which a carbon steel is widely used. Carbon steel corrosion rate increases due to carbonation or contamination with chloride anions. The activation time is strongly influenced by the concrete structure as it influences the diffusion rate of corrosion agents. Therefore, modern ultra-high performance concrete materials are designed to provide less porous structure. Electrochemical impedance spectroscopy (EIS) was used to determine microstructure of different concrete types; ordinary portland cement concrete (OPC), and two ultra-high performance concretes with different water/cement ratio. The microstructure was compared between the different concrete types, and as influenced by the time of curing. Results obtained from EIS correlate well with those of traditionally used mercury intrusion porosimetry.

Keywords: Concrete microstructure, UHPC, OPC, EIS

© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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