SYMPOSIA PAPER Published: 01 January 1986
STP18306S

X-Ray Permeability of Corrosion Products as a Measure of the Rate of Corrosion of Rebars and of Prediction of Concrete Cracking

Source

Normalized reinforced specimens were placed in 3.5% circulating sodium chloride (NaCl) solution (25°C) under a +850-mV anodic charge. At several time intervals on all of these specimens X-ray radiographies were taken focused on the rebars and on the concrete, and the specimens were placed again in the solutions. Measurements were taken for four months. Because of the direct lowering of the pH in the interface rebar-concrete, the pure electrochemical character of the corrosion overcomes the carbonation, and the concrete cracking is mainly and directly caused by the formation of corrosion products. It was also proved by electron probe micro-analysis (EPMA), a solid state diffusion of Fe2+ through the concrete. It was found that during the exposure the permeability of X-rays in the corrosion products decreases because of mechanical stresses. It is possible to follow the evolution of the corrosion products by X-rays and from their permeability to predict the cracking of the concrete caused by the formation of corrosion products.

Author Information

Skoulikidis, T
National Technical Engineering, Athens, Greece
Marinakis, D
National Technical Engineering, Athens, Greece
Batis, G
National Technical Engineering, Athens, Greece
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Developed by Committee: G01
Pages: 108–117
DOI: 10.1520/STP18306S
ISBN-EB: 978-0-8031-4955-7
ISBN-13: 978-0-8031-0468-6