Title: The Role of Corrosion Inhibitors in High-Performance Concrete

Author(s): Theodor A. Burge

Publication: Symposium Paper

Volume: 172

Issue:

Appears on pages(s): 375-396

Keywords: Admixtures; concretes; mixed corrosion resistance; reinforcing steels

DOI: 10.14359/6142

Date: 12/1/1999

Abstract:
This paper deals with a new generation of corrosion inhibitors, the so called mixed inhibitors. Mixed inhibitors influence both the anodic and the cathodic sites in reinforced concrete by the formation of an adsorbed layer. Nitrogen is usually the active atom in the adsorbed layer. Typical compounds of nitrogen used as inhibitors are amines. The bond strength of the adsorbed layers is due to the nitrogen atom’s high density of electrons and ability to form co-ordinate bonds. Extensive tests have shown that this type of corrosion inhibitors do not negatively influence the fresh and hardened concrete properties. The mode of action of these inhibitors has been investigated by different methods, cracked beam tests, X-ray Photoelectron Microscopy (XPM), X-ray Photoelectron Spectroscopy (XPS), Secondary Ion Mass Spectroscopy (SIMS) and Secondary Neutron Mass Spectroscopy (SNMS).