Effect of nano cementitious composites on corrosion resistance and residual bond strength of concrete

Abstract

The interconnection between the steel and concrete is frequently weakened by corrosion. Interestingly, it has been observed that nano pozalonic materials offer an economical approach for lowering the permeability of concrete by enhancing its morphological characteristics. This research discusses the impact of nano pozalonic materials on strengthening the corrosion resistance and pull-out behaviour of steel reinforcement in concrete. In order to treat concrete specimens with accelerated or immersion-based corrosion procedures, the cement is replaced with nanocement (NC) or nano fly ash (NFA).The performance of concrete is tested by evaluating its compressive strength, chloride ion penetration, corrosion potential, and water permeability. The steel reinforcement is examined to assess the residual yield strength and mass loss. In order to assess the bond-slip behaviour between concrete and the reinforcing steel, pull-out tests are performed. Our findings indicate that concrete with nano cement and nano fly ash exhibited excellent corrosion resistance by retaining the yield strength of reinforcement steel and corresponding bond strength.

Keywords

• Nano fly ash
• Accelerated corrosion
• Half cell potential
• Water permeability
• Bond strength
• Corrosion resistance