Susceptibility of Bridge Steel and Concrete Components to Microbiological Influenced Corrosion (MIC) and Microbiological Influenced Deterioration (MID) in Florida
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2019-05-01
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Edition:Final Report
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Abstract:Submerged steel piles had localized corrosion associated with microbiologically influenced corrosion (MIC). The site also had heavy marine growth. The effect of crevice environments created by the macrofoulers may support MIC. Also, concrete may be subject to deterioration by microbiologically influenced deterioration (MID). Field visits to Florida natural water sites and a review of the literature and databases indicated that there are locations in Florida that support MIC. Steel samples were installed at three sites (brackish and fresh waters). The presence of marine fouling was an important part of the corrosion system. Laboratory testing identified the effects of crevices and availability of bacteria and nutrients on MIC. The use of steel coatings and galvanic cathodic protection was assessed for mitigation of MIC in environments with marine fouling. The use of polyurea and a water-based copper-free antifouling coating was examined to identify mitigation. The anti-fouling coating showed less barnacle growth compared to polyurea and had generally lower surface populations of SRB, IRB, APB, and SFB. Complications in cathodic protection (CP) arise with the presence of MIC and marine fouling. Steel field specimens were coupled to a zinc anode at the test sites. Application of CP reduced the corrosion rate, but results indicated that there were portions of the steel array under marine fouling that did not receive sufficient cathodic polarization. In field testing of concrete immersed in the test sites, heavy marine fouling and bacteria developed on the specimen surface. No differentiation in bulk concrete characteristics relating to MID were identified. Application of a polyurea did not mitigate marine fouling or bacteria formation.
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