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Microbiological Influenced Corrosion (MIC) in Florida Marine Environment

A preliminary research to identify the possible susceptibility of a case study marine bridge infrastructure to MIC is the main objective. This will be supported by determining the bacteria, nutrient levels, environmental conditions and other factors that could support MIC.

 

Product Number: 51317--9536-SG
ISBN: 9536 2017 CP
Author: Mayrén Echeverría Boan
Publication Date: 2017
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Microbiologically Influenced Corrosion (MIC) is an important degradation mechanism for materials in a wide variety of industries. Although MIC has not traditionally been a major durability concern for Florida coastal and inland bridges a recent finding of severe corrosion of steel bridge piles associated with microbial activity compounded by greater service life performance expectations for transportation infrastructure has made identification of material degradation susceptibility of vital interest. Testing of metal samples and water from the bridge indicated strong presence of microbial growth that can be associated with MIC. Anaerobic sulfate reducing bacteria acid producing bacteria and slime producing bacteria were recovered. Additional sampling and testing of steel coupons and water at varying depth were made to verify environmental conditions in Florida marine environments that can support MIC. Sampling of water from five Florida locations were tested to characterize the chemical makeup including pH biochemical oxygen demand chemical oxygen demand total organic carbon inorganic compound (phosphate nitrate sulfate sulfide chloride ammonium) and microbe content. The results from the preliminary survey and literature review will help to identify the supportive environmental condition for colonization and sustained microbial activities for Florida coastal and inland bridges.

Keywords: Microbiological Influenced Corrosion, Steel bridge Piles, Marine Environment

Microbiologically Influenced Corrosion (MIC) is an important degradation mechanism for materials in a wide variety of industries. Although MIC has not traditionally been a major durability concern for Florida coastal and inland bridges a recent finding of severe corrosion of steel bridge piles associated with microbial activity compounded by greater service life performance expectations for transportation infrastructure has made identification of material degradation susceptibility of vital interest. Testing of metal samples and water from the bridge indicated strong presence of microbial growth that can be associated with MIC. Anaerobic sulfate reducing bacteria acid producing bacteria and slime producing bacteria were recovered. Additional sampling and testing of steel coupons and water at varying depth were made to verify environmental conditions in Florida marine environments that can support MIC. Sampling of water from five Florida locations were tested to characterize the chemical makeup including pH biochemical oxygen demand chemical oxygen demand total organic carbon inorganic compound (phosphate nitrate sulfate sulfide chloride ammonium) and microbe content. The results from the preliminary survey and literature review will help to identify the supportive environmental condition for colonization and sustained microbial activities for Florida coastal and inland bridges.

Keywords: Microbiological Influenced Corrosion, Steel bridge Piles, Marine Environment

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