Analysis of the influence of reactions between galvanized steel and fresh concrete in the bond stress of reinforced concrete

ABSTRACT

Hot-dip galvanized steel is widely used to control corrosion in reinforced concrete structures exposed to aggressive environments. This makes it important to analyze the behavior of this steel in the structural performance of these structures. The literature presents uncertainties and few studies on this topic. Thus, the objective of this work was to analyze the influence of initial corrosion of galvanized steel due to the high alkalinity of fresh concrete on the bond strength of reinforced concrete. For analysis, specimens composed of a concrete cube with a bar located in the center with a defined length of adhesion were used, using steel bars (galvanized and non-­galvanized) in diameters of 10 mm and 20 mm. Adherence was evaluated using the simple pull-out test. The results showed that the loss of thickness of the galvanizing layer for all bars due to initial corrosion arising from contact with fresh concrete did not cause significant damage to the protection provided by this layer to the steel, nor did it decrease its adhesion stress to the steel. concrete.

Keywords
Corrosion; galvanized reinforcement; reinforced concrete; bond strength; hot-dip galvanizing