Improvement in concrete durability using glass-ceramic bonding enameled reinforcement

Author(s): Charles A. Weiss, R.D. Moser, P.G. Allison, P.G. Malone, S.L. Craig, S.W. Morefield
Paper category: Conference
Book title: 2nd International conference on Microstructural-related Durability of Cementitious Composites
Editor(s): Guang Ye, K. Van Breugel, Wei Sun, Changwen Miao
Print ISBN: 978-2-35158-129-2
e-ISBN: 978-2-35158-123-0
Publisher: RILEM Publications SARL
Pages: 1165 - 1172
Total Pages: 7
Language: English

This paper presents the results of microstructural characterization studies that examined a novel enamel coating developed by the US Army Engineer Research and Development Center (ERDC) for reinforcing steels embedded in concrete. The coating consists of an inner enamel layer which protects the steel from corrosion and a hydraulically reactive outer surface containing portland cement which increases bond strength with the surrounding concrete. Such coatings provide many advantages over traditional polymeric coatings which are known to decrease bond strength with concrete. Our research presents a comparison of the mechanical properties and characterizes the microstructure of the interface between uncoated reinforcing steel and reinforcing steel with the reactive enamel coating when embedded in mortar. The interfacial transition zone (ITZ) of the two systems was examined using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and nanoindentation techniques. The characterization studies indicate that the enhanced bond is provided by an increase in density and a change in the microstructure of the ITZ. The coating also exhibited a dense and protective inner enamel layer along with residual anhydrous cement in the outer layer which may provide self-healing capabilities.

Online publication: 2013
Publication Type: full_text
Public price (Euros): 0.00