Nanoparticles in Concrete: Application in Fresh and Hardened State

Abstract:

The paper summarizes utilization of nanoparticles (NP) in concrete for enhancing its mechanical, transport or other properties. The first part is devoted to review of NPs used in fresh concrete mixtures that have been reported previously in the literature while the second part shows original results from utilization of nanoparticles as healing agents for reparing of existing concrete structures. In the second case, nanoparticles are delivered to concrete via electrokinetic principle by using their surface charge provided in colloidal solutions. Particles are transported in the pore liquid of concrete due to electric field applied between the concrete surface and steel reinforcement. In this way, distressed concrete can be repaired, cracks sealed and risk of corrosion diminished. The injection of NPs can be complemented with extraction of chlorides that are the main deteriorating chemicals in reinforced concrete structures. Finally, the paper shows a framework developed for the electrokinetic transport of ionic species in concrete applied to chloride extraction from concrete and how it can be modified also for transport of nanoparticles.

• Periodical: Key Engineering Materials (Volume 760)
• Pages: 3-9
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.760.3
• Online since: January 2018
• Authors: Jiří Němeček*, Rostislav Šulc, Jitka Němečková, Jaroslav Kruis
• Keywords: Chlorides, Concrete, Electrokinetics, Migration, Nanoparticles

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