Electrochemical injection of nanoparticles into concrete

Author(s): Jiří Němeček, Petr Hlaváček, Milan Kouřil, Tereza Jamborová
Paper category: Proceedings
Book title: Proceedings of the International RILEM Conference on Materials, Systems and Structures in Civil Engineering Conference segment on Electrochemistry in Civil Engineering
Editor(s): Lisbeth M. Ottosen
ISBN: 978-2-35158-176-6
e-ISBN: 978-2-35158-177-3
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 92-98
Total Pages: 7
Language : English

Abstract: In this contribution, the possibility of nanoparticle injection by electromigration, as a novel approach for concrete repair, is presented. The electromigration was employed to inject nanosilica particles and an organosiliconate into normal Portland cement concrete. Several different concentrations of solutions were tested. Incorporation of nanosilica to inner pore system and the effect on the densification were studied by means of SEM-EDS and accelerated chloride penetration tests on treated and control samples. It was found that nanosilica can penetrate a few millimeter zone in a reasonable time and further block chloride penetration. The effect is higher if a higher concentration of nanoparticles is used. Large decrease in chloride concentration in outer parts of concrete later exposed to accelerated chloride penetration test was achieved on samples treated with both nanosilica and organosiliconate solution. Several issues still remain open like particles agglomeration or the change in the subsequent chloride profile in the sample compared to natural diffusion or accelerated migration.

Online publication : 2016
Publication type : full_text
Public price (Euros) : 0.00