Microbiologically induced corrosion
Article Abstract:
Sulfate-oxiding bacteria had heavily corroded the steel H-columns of the Cary Farber Sherman Hall at the State University of New York, though soundly built with four-hour fire ratings. Dirty water used in the concrete sheathing and a moist vermiculite fireproofing might have stimulated bacterial growth in the steel sections. Repairs called for column stripping, biocide treatment and refireproofing. The biocide - chlorhexidine digluconate in denatured ethanol - totally wiped out the bacteria while the new fireproofing - cement binded with vitreous slag fiber - maintained the columns' four-hour fire ratings.
Publication Name: Civil Engineering
Subject: Science and technology
ISSN: 0885-7024
Year: 1992
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Fiber jackets put the wraps on bridge columns
Article Abstract:
High-strength fiber composite jackets present a viable alternative for seismic and corrosion protection of concrete columns. The latest project to employ the technique is the Nugget Hotel in Reno, NV. The composite jacket's advantages include the increase in flexural/shear strength and flexibility, cost-competitiveness with steel and easy installation. Post-tensioning may be done by applying cement or grout which can also fill out column cracks. The technique still needs refining and engineers want to ensure that lab mixture formulas are applied in actual work.
Publication Name: Civil Engineering
Subject: Science and technology
ISSN: 0885-7024
Year: 1993
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Study shows aluminium deck resists corrosion
Article Abstract:
An analysis of an aluminum bridge deck in Pittsburg, PA by Reynolds Metals revealed that aluminum decks were highly resistant to corrosion. Aluminum could outperform other materials in terms of performance if modern alloy and design improvement were made. The study found that fastener corrosion, water and silt accumulation, and galvanic attack were preventable causes of limited corrosion. These effects could be capped by design modification and applying modern coatings.
Publication Name: Civil Engineering
Subject: Science and technology
ISSN: 0885-7024
Year: 1995
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