biofilm - Concrete Biodeterioration CEE 8813 April 25, 2006...

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1 Concrete Biodeterioration CEE 8813 April 25, 2006 Jonah Kurth Slide 2 Lecture Overview • History of Research • Types of Microbes • Methods of Deterioration • Methods of Remediation
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2 Slide 3 History of Research • Degredation of sewers first detected in 1900 • Original explanation was purely chemical • Australian research in 1945 first to correlate bacteria and deterioration [9] Gu, J.D. et al (1998) Slide 4 Early Australian Research First to link bacteria to deterioration Showed that Thiobacilli concretivorus, not H 2 S, caused most deterioration Proposed multiple species are responsible for deterioration Fig. 1 - Blocks after removal of corroded material [18] Parker, C.D. (1945)
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3 Slide 5 Research in Germany • Identified three strains in Hamburg sewer T. intermedius/novellus (colonizer) T. neapolitanus (pH lowerer) T. thiooxidans (destroyer) • Performed experiment before demolition – Turned on oxygen supply – pH increased, T. Thiooxidans diminished [16] Milde, K. et al (1983) Slide 6 Current Research • Fungi considered for biodeterioration [9],[23] • Nitrifying bacteria discovered on building exteriors [23],[22] – No longer confines research to sewers – Concrete parallels stone and wood deterioration • Use of modern techniques to study microbes – SEM, LVSEM to photograph stains [5] – pCR analysis to identify species [27]
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Slide 7 Types of Microbes Microbes (Fungi, bacteria, algae) Heterotrophs (need organics) Sewers Outside Outside Slide 8 Sewer Microbes Environment – Anaerobic (oxygen poor) – Low light conditions – Sulfur Rich
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This note was uploaded on 08/23/2011 for the course CEE 8813b taught by Professor Kurts during the Spring '07 term at Georgia Institute of Technology.

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biofilm - Concrete Biodeterioration CEE 8813 April 25, 2006...

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