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Concrete biodeterioration associated to diesel fuel oil contamination and selecting test attempt for repairing material



Title: Concrete biodeterioration associated to diesel fuel oil contamination and selecting test attempt for repairing material
Author(s): M. Shirakawa, V. M. John, M. A. Cincotto, W. Gambale
Paper category : conference
Book title: First International RILEM Workshop on Microbial Impact on Building Materials
Editor(s): M. Ribas Silva
Print-ISBN: None
e-ISBN: 2351580133
Publisher: RILEM Publications SARL
Publication year: 2000
Pages: 70 - 75
Total Pages: 6
Nb references: 2
Language: English


Abstract: This paper discusses the effect of contaminated groundwater with diesel fuel oil in the microbial colonisation on shotcrete tunnel in São Paulo City, Brazil. The concrete microbiological analysis showed high concentrations of sulphate reducing bacteria, sulphur oxidising bacteria, heterotrophic bacteria, and filamentous fungi. The presence of diesel fuel oil in the groundwater was confirmed. The process began by the leaching of the concrete by acid water and infiltration of contaminated water with diesel fuel oil, which was taken as a nutrient source by aerobic heterotrophic bacteria and fungi. In anaerobic micro-niches sulphate reducing bacteria were able to grow producing hydrogen sulphide. The latter could be used as an energy source by sulphur oxidising bacteria to produce sulphuric acid, justifying the lower pH measured in the deteriorated area. Sludge collected from the tunnel, containing several genera of micro-organisms, was used to carry out a test to select an admixture for repairing and application of the second layer tunnel lining. An attempt to evaluate the biological attack was made through the mechanical strength. Two acrylic resins, styrene butadiene and a silico-aluminate admixtures were tested. Styrene butadiene, comparatively to others admixtures, presented the worst performance.


Online publication: 2000-06-30
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2351580133.011