Nanoparticle Injection into Concrete Using Electromigration

Abstract:

This paper aims at investigation of possibilities and effectiveness of chloride extraction from concrete and nanoparticle injection into existing reinforced concrete structures by means of electromigration technique. Concrete specimens are exposed to accelerated chloride penetration tests in order to simulate a natural chloride exposure. The developed chloride profile is removed by electroextraction by reversing the polarity in the testing chamber. In a similar manner, concrete specimens are injected with different concentrations of colloidal nanosilica particles. It was shown in the paper that chlorides can be effectively extracted from the concrete using small voltage lasting for several days. Higher concentration solutions of nanosilica can also be effectively transported into concrete via the electric field. Once injected nanosilica can act as microstructure densifier and further reduce chloride penetration as demonstrated by decreased diffusivity of the treated concrete.

• Periodical: Advanced Materials Research (Volume 1054)
• Pages: 6-10
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1054.6
• Online since: October 2014
• Authors: Jiří Němeček*, Yun Ping Xi
• Keywords: Chlorides, Concrete, Electromigration, Nanoparticle, Nanosilica

References

[1] U. Angst U, Ø. Vennesland, Critical chloride content in reinforced concrete – State of the art, Concrete Repair, Rehabilitation and Retrofitting II, Alexander et al (eds), Taylor and Francis Group, London, (2009).

DOI: 10.1201/9781439828403.ch41

[2] K.Y. Ann, H.W. Song, Chloride threshold level for corrosion of steel in concrete, Corrosion Science 49 (2007), 4113–4133.

DOI: 10.1016/j.corsci.2007.05.007

[3] Y. Liu, X. Shi, Electrochemical Chloride Extraction and Electrochemical Injection of Corrosion Inhibitor in Concrete: State of the knowledge, Corrosion Reviews 27(1–2) (2009), 53–81.

DOI: 10.1515/corrrev.2009.27.1-2.53

[4] G.G. Clemeña, D.R. Jackson, Trial Application of Electrochemical Chloride Extraction on Concrete Bridge Components in Virginia, Final report FHWA/VTRC 00–R18, Virginia Transportation Research Council, Charlottesville, (2000).

[5] T.A. Söylev, M.G. Richardson, Corrosion inhibitors for steel in concrete: state of the art report, Construction and Building Materials 22 (2008), 609–622.

DOI: 10.1016/j.conbuildmat.2006.10.013

[6] C.L. Page, V.T. Ngala, M.M. Page, Corrosion inhibitors in concrete repair systems, Magazine of Concrete Research 52 (1) (2000), 25–37.

DOI: 10.1680/macr.2000.52.1.25

[7] S. Sawada, C.L. Page, M.M. Page, Electrochemical injection of organic corrosion inhibitors into concrete, Corrosion Science 47(8) (2005), 2063–207.

DOI: 10.1016/j.corsci.2004.10.001

[8] G. Quercia , G. Hüsken, H.J.H. Brouwers, Water demand of amorphous nano silica and its impact on the workability of cement paste, Cement and Concrete Research 42 (2012), 344–357.

DOI: 10.1016/j.cemconres.2011.10.008