Apparent diffusion coefficient of oxygen and corrosion control of reinforcement rebar coated with primers

DOI: https://doi.org/10.21041/ra.v8i3.336
Keywords: reinforced concrete, corrosion control, diffusion of oxygen, primers

Abstract

The present work evaluates the influence of different primers applied in the reinforcement steel on the apparent diffusion coefficient of oxygen (Dap (O2)) and on the corrosion intensity (Icorr), comparing the results with a reference cimentitious mortar. Oxygen flow (J (O2)) until the reinforcement steel was measured by potenciostático method in steady state. The Icorr was monitored by the Polarization Resistance technique (Rp). Evaluations related porosity of the primers were made through magnifying glasses, optical microscopy and SEM. Primers that represent barrier protection systems proved to be less permeable to oxygen. The Dap (O2) values ranged from 2.1 x 10-6 cm2/s to 4 x 10-9 cm2/s, causing variation in the Icorr due to cathodic control of the corrosion process.

Downloads

Download data is not yet available.

References

ASTM International. (1999). ASTM G1-90(1999), Standard Practice for Preparing, Cleaning, and Evaluating Corrosion Test Specimens. Retrieved from https://doi.org/10.1520/G0001-90R99E01

Andrade, C.; Alonso, C.; Garcia, M. (1990), Oxygen Availability in the Corrosion of Reinforcements. Advances in Cement Research, v. 3, n. 11, pp. 127-132. https://doi.org/10.1680/adcr.1990.3.11.127

Andrade, C.; Gonzalez, J. A. (1978), Quantitative measurements of corrosion rate of reinforcing steels embedded in concrete using polarization resistance measurements. Werkstoffe und Korrosion. V. 29, p. 515-519. https://doi.org/10.1002/maco.19780290804

Castellote, M.; Alonso, C.; Andrade, C.; Chadbourn, G. A.; Page, C. L. (2001), Oxygen and chloride diffusion in cement pastes as a validation of chloride diffusion coefficients obtained by steady-state migration tests. Elsevier, Cement and Concrete Research. Volume 31, Issue 4, April 2001, Pages 621-625. https://doi.org/10.1016/S0008-8846(01)00469-0

Figueiredo, E. J. P. (1994) Avaliação do Desempenho de Revestimentos para Proteção da Armadura Contra a Corrosão Através de Técnicas Eletroquímicas: Contribuição ao Estudo de Reparo de Estruturas de Concreto Armado. São Paulo, EPUSP, Tese de Doutorado, 423p.

Francinete, P. J; Figueiredo, E. J. P. (1999), Estudo da Difusão de Oxigênio no Concreto. São Paulo. EPUSP, BT/PCC/238, ISSN 0103-9830, 22p.

Gjørv, O.; Vennesland, O.; El-Basaidy, A. H. S. (1986), Diffusion of Dissolved Oxygen through Concrete. Materials Performance, v. 25, pp. 39-44.

Hansson, C. M. (1993), Oxygen Diffusion Through Portland Cement Mortars, Corrosion Science, vol. 35, n. 5-8, pp. 1551 – 1556. https://doi.org/10.1016/0010-938X(93)90383-R

Helene, P. R. L. (1993), Contribuição ao Estudo da Corrosão em Armaduras de Concreto Armado. São Paulo, CPGECC/EPUSP, Tese de Livre Docência.

Kobayashi, K.; Shutton, K. (1991), Oxygen Diffusivity of Various Materials. Cement and Concrete Research, vol. 21, no 2-3, pp. 273 – 284. https://doi.org/10.1016/0008-8846(91)90009-7

McCafferty, E. (2010), Kinetics of Corrosion. In: Introduction to Corrosion Science. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-0455-3

Page, C.; Lambert, P. (1987), Kinetics of Oxygen Diffusion in Hardened Cement Pastes. Journal of Materials Science, v. 22, pp. 942-946.

Stern, M.; Geary, A. L. (1957), Electrochemical Polarization. A theorical Analysis of the Sharp of Polarization Curves. Journal Electrochemical Society, Vol. 104, nº 1, pp 56-63.

Tuutti, K. (1982), Corrosion of steel in concrete. Sweden: CBI, 468 p.

Published
2018-08-31
How to Cite
Pazini, E., & Andrade, C. (2018). Apparent diffusion coefficient of oxygen and corrosion control of reinforcement rebar coated with primers. Revista ALCONPAT, 8(3), 288 - 300. https://doi.org/10.21041/ra.v8i3.336
Issue
Vol. 8 No. 3 (2018)
Section
Basic Research

_______________________________

License in effect from September 2020

You are free to:

  1. Share — copy and redistribute the material in any medium or format for any purpose, even commercially.
  2. Adapt — remix, transform, and build upon the material for any purpose, even commercially.
  3. The licensor cannot revoke these freedoms as long as you follow the license terms.

Under the following terms:

  1. Attribution — You must give appropriate credit , provide a link to the license, and indicate if changes were made . You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
  2. No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.

Notices:

You do not have to comply with the license for elements of the material in the public domain or where your use is permitted by an applicable exception or limitation .

No warranties are given. The license may not give you all of the permissions necessary for your intended use. For example, other rights such as publicity, privacy, or moral rights may limit how you use the material.