Simulation of Microbiologically and Chemically Influenced Corrosion of Natural Sandstone

Mansch, R.; Bock, E.

doi:10.1520/stp12936s

Cited by 2 publications

(3 citation statements)

References 13 publications

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“…Growth of nitrifying organisms on concrete is not sequential as observed for the sulfur-oxidizing bacteria. However, in controlled experiments (using a simulation chamber), it was found that mixed cultures of Nitrosomonas and Nitrobacter inoculated on concrete blocks produced about 14 mL of 65% nitric acid per block per year (Mansch and Bock 1992). This was sufficient acid to dissolve the concrete and produce the breakdown product calcium nitrate.…”

Section: Technical Backgroundmentioning

confidence: 99%

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Microbial degradation of low-level radioactive waste. Volume 2, Annual report for FY 1994

Rogers¹,

Hamilton²,

Veeh³

et al. 1995

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The Nuclear Regulatory Commission stipulates in 10 CFR 61 that disposed lowlevel radioactive waste (LLW) be stabilized. To provide guidance to disposal vendors and nuclear station waste generators for implementing those requirements, the NRC developed the Technical Position on Waste Form, Revision 1. That document details a specified set of recommended testing procedures and criteria, including several tests for determining the biodegradation properties of waste forms. Cement has been widely used to solidify LLW; however, the resulting waste forms are sometimes susceptible to failure due to the actions of waste constituents, stress, and environment. The purpose of this research program is to develop modified microbial degradation test procedures that will be more appropriate than the existing procedures for evaluating the effects of microbiologically influenced chemical attack on cement-solidified LLW. Groups of microorganisms indigenous to LLW disposal sites are being employed that can metabolically convert organic and inorganic substrates into organic and mineral acids. Such acids aggressively react with cement and can ultimately lead to structural failure. Results over the past year on the application of mechanisms inherent in microbially influenced degradation of cement-based material are the focus of this annual report. Data-validated evidence of the potential for microbially influenced deterioration of cement-solidified LLW and subsequent release of radionuclides has been developed during this study.

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Section: Technical Backgroundmentioning

confidence: 99%

“…1993). However, data from the literature (Diercks et al 1991;Mansch and Bock 1992) indicate that these bacteria do grow on the surface of concrete under natural and laboratory conditions. The question of how to initiate growth on fresh concrete was answered by Bock.…”

Section: Nureg/cr-6188mentioning

confidence: 99%

Microbial degradation of low-level radioactive waste. Volume 2, Annual report for FY 1994

Rogers¹,

Hamilton²,

Veeh³

et al. 1995

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“…Microbial involvement in the biodegradation of concrete has been studied extensively (Jozsa et al 1996;Mansch and Bock 1994).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of ozone for preventing fungal influenced corrosion of reinforced concrete bridges over the River Nile, Egypt

Geweely

2010

Biodegradation

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Fungal influenced corrosion (FIC) of some corroded sites in three selected bridges [Embaba bridge (E-bridge), Kasr al-Nile-bridge (K-bridge) and University bridge (U-bridge)] located over the River Nile in Egypt were investigated. Six fungal species, belong to 12 fungal genera, were isolated from the corroded reinforced concrete of the three tested bridges. Fourier transform infrared spectroscopy (FTIR) was screened for the most dominant fungal species (Fusarium oxysporium) which showed in all tested bridges that indicated the presence of amine group accompanied with polysaccharides contents. FIC of the most deteriorated bridge (K-bridge) was documented with FTIR. The association of fungal spores with corrosion products was recorded with scanning electron microscope (SEM). Evaluation of ozone for preventing FIC of the K-bridge was carried out by recording the corrosion rate and the corresponding inhibition efficiency (IE%). No mycelial growth with 100% IE was observed at 3 ppm ozone concentration after 120 min exposure time. With longer duration of ozone exposure, the membrane permeability of F. oxysporium was compromised as indicated by protein and nucleic acid leakages accompanied with lipid and tryptophan oxidation. The total intracellular and extracellular proteins of F. oxysporium were run on sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) indicated the increasing of the supernatant protein on the expense of the cellular protein bands with extending ozone exposure time (0-80 min).

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Simulation of Microbiologically and Chemically Influenced Corrosion of Natural Sandstone

Cited by 2 publications

References 13 publications

Microbial degradation of low-level radioactive waste. Volume 2, Annual report for FY 1994

Microbial degradation of low-level radioactive waste. Volume 2, Annual report for FY 1994

Evaluation of ozone for preventing fungal influenced corrosion of reinforced concrete bridges over the River Nile, Egypt

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