Title: Coatings with embedded particles to increase interfacial anchorage of steel and GFRP rebars in concrete

Authors: José De Jesús Pérez Bueno; Jorge Luis Soto Corral; José Luis Reyes Araiza; Maria Luisa Mendoza López; Alejandro Manzano-Ramírez

Addresses: Centro de Investigación y Desarrollo Tecnológico en Electroquímica, S.C., Parque Tecnológico Sanfandila, Pedro Escobedo, Querétaro, 76703, Mexico ' Facultad de Ingeniería Química, Tecnológico Nacional de Mexico, Instituto Tecnológico de Durango, Blvd. Felipe Pescador 1803 Ote., Durango, Dgo., 34080, Mexico ' Facultad de Ingeniería, Universidad Autónoma de Querétaro, Cerro de las Campanas s/n C.P. 76010, Cto. Universitario, Centro Universitario, Santiago de Querétaro, Querétaro, 76010, Mexico ' Tecnológico Nacional de México, Instituto Tecnológico de Querétaro, Av. Tecnológico s/n Esq. M. Escobedo, Col. Centro, Santiago de Querétaro, Querétaro, 76000, Mexico ' Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Unidad Querétaro, Libramiento Norponiente #2000, Fracc. Real de Juriquilla, C.P. 76230, Santiago de Querétaro, Qro., Mexico

Abstract: Three different types of coatings were studied for protecting rebars against corrosion: sol-gel silica, organic polymer (bisphenol A-fumarate), and organic-inorganic hybrid nanometric compound. This work proposes the addition of particles of about 5 mm in size, heterogeneously distributed, such as recycled glass or sand on the coatings to gain mechanical anchorage between the coated steel rebars and the concrete. This surface change was tested in rebars of fiber-reinforced polymer (GFRP) with fiberglass. The result was that this factor increased the force required for the extraction of the rebars. The low thickness of sol-gel SiO2 coatings made with TEOS was unsuitable for this application. The coatings with polymeric resin offered protection against corrosion in an economical and straightforward form. The organic-inorganic hybrid coatings, using silane coupling agents, provide coatings with adequate protection but depending on the preparation process and a cost increase regarding to the polymeric resin.

Keywords: hybrid coatings; rebars; concrete; sol-gel; corrosion; fly ash.

DOI: 10.1504/IJSURFSE.2021.118203

International Journal of Surface Science and Engineering, 2021 Vol.15 No.3, pp.221 - 241

Received: 26 Oct 2020
Accepted: 27 Feb 2021

Published online: 17 Sep 2021 *

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