Concrete specimens biodeterioration by bacteria of<i>Acidithiobacillus thiooxidans</i>and<i>Desulfovibrio</i>genera

Harbulakova, Vlasta Ondrejka; Estokova, Adriana; Luptáková, Alena; Števulová, Nadežda; Janak, G.

doi:10.1556/pollack.4.2009.1.9

Cited by 8 publications

(2 citation statements)

References 5 publications

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“…The increase in weight was measured for "G" type composites with bacteria influence as well as for its abiotic control. These results corresponds to noticeable formation of solid phases on the composites surfaces as referred in [18][19][20][21] such as gypsum, ettringite or thaumasite. Deterioration of cement based materials under bacteria influence was confirmed by many researches [6,[22][23][24][25] but according to literature needs relatively long time.…”

Section: Resultsmentioning

confidence: 71%

Study of durability of fibrous cement based materials exposed to microorganisms

Harbulakova

Estokova

2014

The 9th International Conference "Environmental Engineering 2014"

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Fibrous cement based materials belong to the main long-lasting building materials. Few building materials offer a combination of architectural scope and strong technical specification as convincing as fibrous cement based materials e.g. cladding and roofing. One of the most desirable qualities of fibrous cement based board is its durability due to its ability to resist all kinds of weather conditions. Frost and thaw, heat, hale or rain does not pose a threat to fibrous cement based materials. Unlike wood siding, fibre board siding doesn't rot or require frequent repainting. Inside buildings fibrous cement based materials are applied as backer board in wet areas or for dry walls in heavy duty applications where fire resistance and strength are the dominant requirements. The paper is primarily concerned with fibrous cement based specimens' microbially influenced under laboratory conditions during 3 months. In the experiment, sulphate-reducing bacteria (SRB) genera Desulfovibrio spp. and sulphur-oxidising bacteria Acidithiobacillus thiooxidans were used. The role of bacteria mentioned above has been linked to the generation of biogenic sulphuric acid resulting in corrosion process by dissolution of calcium containing minerals from the matrices of building materials. Cement fibres boards exposed to simultaneous deleterious effect of bacteria were evaluated by weight and surface changes of the specimens and pH values changes in leachates.

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Section: Resultsmentioning

confidence: 71%

Study of durability of fibrous cement based materials exposed to microorganisms

Harbulakova

Estokova

2014

The 9th International Conference "Environmental Engineering 2014"

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“…Their main effect is that they breathe the sulphur and all of its compounds as sulphate, sulphite, etc. to produce a sulphide or hydrogen sulphide as a by-product of the breathing metabolism process as well as they produce H 2 in the process formation of iron sulphide, FeS [21], [22]. SRB exist widely in deep geological repository and they influence iron corrosion by releasing free Fe ions in the solution surroundings the glass, which are expected to create different kinds of iron carbonate minerals [23].…”

Section: Iron Corrosion Productsmentioning

confidence: 99%

Corrosion of glass used for radioactive waste disposal – state of the art

Dabbas

Kopecskó

2019

Pollack Periodica

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Iron corrosion products of the steel canister in the nuclear waste container are highly silica sorptive materials and very much expected to delay formation of the protective layer (gel) on the nuclear glass interface. This study is focusing on the role of the iron carbonates (ankerite), which is probably one of iron corrosion products and already exists in the clay structure of the disposal depth. French SON68 inactive reference glass (alternative to the R7T7type) samples are planned to leach in different series of experimental models with dissimilar quantities of natural ankerite. All batch experiments will be cultivated in synthetic Callovo-Oxfordian groundwater; where different pH (4-9) values and temperatures (35, 50, 90 °C) are considered. In this paper the state of the art of the radioactive waste glass corrosion in the circumstances of deep geological disposal were extensively studied.

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