Title:
Corrosion Resistance of Concrete Incorporating Supplementary Cementing Materials in a Marine Environment
Author(s):
Andrew Fahim, Edward G. Moffatt and Michael D.A. Thomas
Publication:
Symposium Paper
Volume:
320
Issue:
Appears on pages(s):
18.1-18.14
Keywords:
chloride ingress, corrosion, corrosion monitoring, marine environment, servicelife modeling, supplementary cementing materials, durability
DOI:
10.14359/51701056
Date:
8/1/2017
Abstract:
This paper presents results obtained from steel-reinforced concrete specimens retrieved after 25 to 27 years of exposure in a marine environment. The specimens included mixtures with various SCM blends (25% fly ash, 10% silica fume and 50% slag), as well as a mixture without any SCM, all at a W/CM of 0.50. Testing included chloride-ion depth determination, rapid chloride permeability test, bulk electrical resistivity test and
electrochemical corrosion-monitoring. The chloride profiles revealed that SCM incorporation leads to a significant decrease in chloride-ion penetration, which was supported by rapid
chloride permeability and bulk electrical resistivity tests. Electrochemical corrosionmonitoring showed passivity for all reinforcements at a cover depth of 70 mm or more for
specimens incorporating SCMs, while for specimens not containing SCMs, all reinforcements, up to a cover depth of 140 mm, showed active corrosion. Finally, it was found that the reinforcement corrosion rate in SCM concrete was significantly lower than that for portland cement concrete.
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