Specification of the process of chloride extraction from reinforced concrete based on the inverse task of the diffusion equation

• Autorzy: Alsabry A. , Zybura A.

Identyfikatory

DOI

10.1515/ijame-2016-0016

• Języki publikacji: EN

Abstrakty

EN

When the structure of reinforcement is in danger of chloride corrosion it is possible to prevent this disadvantageous phenomenon through exposing the cover to the influence of an electric field. The forces of an electric field considerably reduce chloride ions in pore liquid in concrete, which helps to rebuild a passive layer on the surface of the reinforcement and stops corrosion. The process of removing chlorides can be described with multi-component diffusion equations. However, an essential parameter of these equations, the diffusion coefficient, can be determined on the basis of an inverse task. Since the solution was achieved for one-dimension flow, the method applied can be confirmed by experimental results and the material parameters of the process can be determined theoretically. Some examples of numerical calculations of the effective electro-diffusion coefficient of chloride ions confirmed the usefulness of the theoretical solution for generalizing experimental results. Moreover, the calculation process of the numerical example provides some practical clues for future experimental research, which could be carried out in close connection with the theoretical solution.

Słowa kluczowe

EN

corrosion; diffusion; inverse task; removing chlorides; extraction

PL

korozja; dyfuzja; ekstrakcja

• Wydawca: Oficyna Wydawnicza Uniwersytetu Zielonogórskiego
• Czasopismo: International Journal of Applied Mechanics and Engineering
• Rocznik: 2016
• Tom: Vol. 21, no. 2
• Strony: 261--271
• Opis fizyczny: Bibliogr. 12 poz., rys., tab., wykr.

Twórcy

autor

Alsabry A.

• University of Zielona Góra Prof. Szafrana 1 Str. 65-516 Zielona Góra, POLAND

autor

Zybura A.

• Silesian University of Technology Gliwice, POLAND

Bibliografia

• [1] Elsener B., Molina M. and Böhni H. (1993): The electrochemical removal of chlorides from reinforced concrete. – Corrosion Science, vol.35, 5-8, pp.1563-1570.
• [2] Jungwirth D., Grübl P. and Windisch A. (1991): Elektrochemische Schutzverfahren für bewehrte Bauteile aus baupraktischer Sicht. – Beton und Stahlbetonbau vol.86, H, No.7, pp.167–171.
• [3] Mietz J. (1993): Elektrochemische Schutzverfahren zur Beseitigung von Korrosionsrisiken an Stahlbetonbauwerken. – Bauingenieur, vol.68, pp.533–538.
• [4] Tritthart J., Pettersson K. and Sorensen B. (1993): Electrochemical removal of chlorides from hardened cement paste. – Cement and Concrete Research, vol.23, pp.1095-1104.
• [5] Hansson I.L.H. and Hansson C.M. (1993): Electrochemical extraction of chlorides from concrete Part I – A Qualitative model of the process. – Cement and Concrete Research, vol.23, pp.1141-1152.
• [6] Andrade C., Diez J.M., Alamàn A. and Alonso C. (1995): Mathematical modelling of electrochemical chloride extraction from concrete. – Cement and Concrete Research, vol.25, No.4, pp.727-740.
• [7] Polder R.B., Walker R.J. and Page C.L. (1995): Electrochemical desalination of cores from a reinforced concrete coastal structure. – Magazine of Concrete Research, vol.47, pp.321–327.
• [8] Alsabry A. and Wilmański K. (2011): Iterative description of freezing and thawing processes in porous materials. – ZAMM - Zeitschrift für Angewandte Mathematik und Mechanik, vol.91, No.9, pp.753-760.
• [9] Ściślewski Z. (1999): Protection of reinforced concrete structures. – Warsaw: Arkady.
• [10] Kossecka E. (1993): Methodology for preparing measurement data while determining the thermal resistance of building walls. – Materials IV Conference on Building Physics in Theory and Practice, pp.128-135, Łódź.
• [11] Kossecka E. (1991): Balance of simple thermal helios-heating systems and building walls over long time intervals. – Civil Engineering Archives, Vol. XXXVII z. 2, pp.249-264.
• [12] Kubik J. and Rybczyńska A. (1995): Measuring the water diffusion coefficient with component absorption – inverse task. – XLI Scientific Conference of the Civil Engineering Committee of the Polish Academy of Sciences and the Scientific Committee of the Polish Association of Construction Engineers and Technicians, Kraków-Krynica, pp.107-114.

Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę