Combined Corrosion Inhibitors and Mechanical Properties of Concrete Embedded Steel (AISI 316L) during Accelerated Saline Corrosion Test

Abstract

The objective of this effort is to study the effect that the combination of fly ash (FA) with a liquid corrosion inhibitor has on the mechanical degradation of 316L rebars embedded in concrete specimens during salt fog testing for a period of four months, as well as the porosity of concrete. Partial replacement of Ordinary Portland Cement (OPC) by FA (0–25%) did not significantly affect the tensile properties of 316L except a small decrease in the elastic modulus and % elongation with FA increasing. Both FA and FA-liquid inhibitor combination resulted in significant reductions in the porosity of the reinforced concrete after 4 m of salt fog testing.

Cyclic Polarization of Corrugated Austenitic Stainless Steel Rebars in Acid Rain: Effect of Fly Ash, pH and Steel Type

“…Furthermore, the increased presence of Ca, S, Si, and minor/traces of Al and Mg in the pits associates pitting with agglomerates of FA. In agreement with previous works [31][32][33]78], it is postulated that FA in large amounts (such as 25 wt.%) tends to form agglomerates, especially when the individual particles are nano-or submicron-sized due to their high surface energy. These agglomerates cannot yield such an intensive pozzolanic or cementitious reaction with Ca(OH) 2 /water as fine individual particles do, owing to their low specific surface area.…”