Biological Corrosion of Polymer-modified Cement Bound Materials Exposed to Activated Sludge in Sewage Treatment Plants

Fiertak, Maria; Stanaszek-Tomal, Elżbieta

doi:10.1016/j.proeng.2013.09.051

Cited by 8 publications

(4 citation statements)

References 5 publications

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“…The research carried out on the influence of mold fungi on cement materials modified with polycarboxylic resin showed that these resins, used in concrete technology as superplasticizers, tighten and slightly unseal the already sealed initial structure of cement mortars, which reduces the susceptibility of these materials to the action of microorganisms. Unfavorable changes in humidity, water absorption and COD prove that these mortars are also, although to a lesser extent, subject to biodeterioration, the estimated rate of which is four times lower compared to polymer-free materials [18].…”

Section: Discussionmentioning

confidence: 99%

“…As a result of the action of filamentous fungi of the genus Penicillium and Cladosporium, two opposing processes occur in cement-polymer composites, related to the deposition of sulphate corrosion products (ettringite, gypsum) [18] and calcium carbonate (the result of mineralization of organic substances, including polymer modifiers in the microcracks. cement mortars and, on the other hand, unsealing of the structure (microcracks), as well as increasing porosity.…”

Section: Discussionmentioning

confidence: 99%

“…The increase in strength may be related to the deposition of corrosion products in the pores and their mineralization with CaCO 3 . Results are presented in [18] in which the sealing of the structure was noticeable due to the formation of calcium carbonate. However, in these tests, 3% polycarboxylate admixture was used.…”

Section: Plos Onementioning

confidence: 99%

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Sealing and unsealing effect of filamentous fungi in CEM I cement mortars with polycarboxylic admixture

Stanaszek-Tomal

2024

PLoS ONE

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Biodeterioration may take place due to the influence of microorganisms, leading to the deterioration or destruction of materials. This process involves distinct mechanisms of material breakdown, such as mechanical damage, decomposition, corrosion induced by microorganisms, and fouling caused by living organisms. Research and literature data on biological corrosion of polymer-modified cement materials (polycarboxylate resin) are ambiguous and even contradictory. Samples, 20x20x160 mm in size, made of cement-polymer mortar with 5% polycarboxylate resin were prepared for the test, with 6 specimens for each determination. The study determined the level of contamination of the material, using the culture method and COD, after 18 months of exposure to Penicillium and Cladosporium fungi. In addition to this, bulk moisture content, water absorption, flexural strength and internal structure were determined using a scanning microscope and EDS analysis was carried out. The beneficial role of polymers has been demonstrated, e.g. by sealing the structure of cement-polymer materials. However, there is also an increased development of biocorrosion associated with organic material as a food source, especially for molds that colonize materials in favorable conditions. The test results showed that there was a strong growth of mold fungi on the material and the mass humidity was high. However, the strength increased slightly, and after further exposure to a corrosive environment it decreased again.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Sealing and unsealing effect of filamentous fungi in CEM I cement mortars with polycarboxylic admixture

Stanaszek-Tomal

2024

PLoS ONE

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“…These resins are modifiers of cement-polymer materials used in building engineering. Preliminary tests [17] indicated that 3% content of pre-mix polymers to cement within a relatively short period of time (6 months) has an effect on susceptibility to microorganism growth. For a testing purpose the rods of 20×20×160 mm in size made of cement-polymer mortars were prepared.…”

Section: Methodsmentioning

confidence: 99%

Biological and chemical corrosion of cement materials modified with polymer

Stanaszek-Tomal¹,

Fiertak²

2015

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. The article presents the effect of the addition of polymer to mortars with CEMI and its influence on durability under conditions of sulfuric acid or nitric and sulphur bacteria or nitrogen (nitrification and denitrification). Both acids corresponds to the products of metabolism of bacteria Acidithiobacillus thiooxidans and Thiobacillus denitrificans, Paracoccus denitrificans by the literature is about 0.15 mmol/dm 3 . The changes in tightness materials studied by determining moisture mass and absorption. Corrosion processes were identified by examination in a scanning microscope equipped with an X-ray microanalyzer and a mercury porosimeter. The research results presented showed that the solution has a significantly weaker effect on the composite cement and cement-polymer compared with the action of bacteria. The action of both environments caused two opposing processes: unsealing the structure and deposition of corrosion products.

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Effectiveness of Surface Coatings Against Intensified Sewage Corrosion of Concrete

Kong

Fang

Zhang

2019

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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Biological Corrosion of Polymer-modified Cement Bound Materials Exposed to Activated Sludge in Sewage Treatment Plants

Cited by 8 publications

References 5 publications

Sealing and unsealing effect of filamentous fungi in CEM I cement mortars with polycarboxylic admixture

Sealing and unsealing effect of filamentous fungi in CEM I cement mortars with polycarboxylic admixture

Biological and chemical corrosion of cement materials modified with polymer

Effectiveness of Surface Coatings Against Intensified Sewage Corrosion of Concrete

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