Evaluation of Corrosion in Reinforced Concrete during the Curing Stage, Treated Superficially with Nanoparticles

Abstract

In the present research a corrosion assessment with electrochemical techniques of linear polarized resistance (LPR) and electrochemical impedance spectroscopy (EIS) was made in reinforced concrete that were treated superficially in the curing stage by silicon-based nanoparticles (SN). The concrete was designed with a water/cement ratio of 0.45 and the steels used were AISI 1018 steel and galvanized steel. The SN were obtained through sol – gel synthesis at a temperature 70 °C in a basic medium. After curing, the concrete developed a decrease in pores, due to the reaction of the SN with calcium hydroxide (CH) surface densification of the cementitious matrix was generated by the formation of secondary hydration products. The overprotection against corrosion in both steels was checked with electrochemical techniques.

Influence of nano zirconia on the mechanical and durability properties of high-performance concrete containing nano-silica

“…Nanoparticles are the particles of size ranging from 1-100 nanometer made from metal oxides, graphenes, carbon nanotubes and ceramic materials. Many researchers have used nanoparticles in the casting of concrete and achieved greater strength and durability compared to conventional concrete [6][7][8][9]. For example, Harilal et al developed a high performance green concrete by partially replacing the cement with nanoparticles and fly ash and reported that the optimum mix containing 2 wt% TiO 2 , 2 wt% nano-CaCO 3 and 40 wt% fly ash enhanced the compressive strength, split tensile strength and flexural strength [10].…”