The Role of Microorganisms in the Destruction of Concrete and Reinforced Concrete Structures

Bryukhanov, A. L.; Vlasov, Dmitry Yu.; Maiorova, M. A.; Tsarovtseva, Inga M.

doi:10.1007/s10749-020-01260-5

Cited by 13 publications

(3 citation statements)

References 28 publications

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“…In addition, the percentage of release of toxic gases increases. On the other hand, the authors of the work [13] investigated that an acidic medium is favorable for the development of pathogenic microorganisms, viruses, fungi, and, taking this into account, the preliminary treatment of polystyrene with an acid solution is questioned.…”

Section: Fig 2 Scheme Of Hydration Of Final Fragments Of Polystyrene ...mentioning

confidence: 99%

Development of a fire-proof coating containing silica for polystyrene

Lysak,

Skorodumova,

Chernukha

2023

PES

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The possibility of applying a silica-containing coating to the surface of XPS extruded polystyrene foam, which is characterized by a high degree of flammability, was evaluated. The effect of the content and concentration (11, 22, 44 and 85 %) of orthophosphate acid on the optical properties of silicic acid sols obtained by the exchange reaction between aqueous solutions of liquid glass and acetic acid was studied. The fact of incorporation of orthophosphate acid into the gel structure was confirmed by the results of acid-base titration with a sodium hydroxide solution of the intermicellar liquid isolated as a result of gel syneresis. Using an optical microscope, the structure of the polystyrene film coating after treatment with orthophosphate and sulfuric acid solutions was investigated. In both cases, the effect of an increase in the pore area and a general increase in the looseness of the surface was noted, which can help reduce its hydrophobicity and improve adhesion to the coating. The increase in hydrophilicity of the surfaces of polystyrene films after treatment with acids was also confirmed by the flatter, non-spherical shape of the drops of the composition on them. The structure of the obtained coatings on polystyrene films was analyzed. The similarity of the directions of the cracks in the case of treatment of the films with solutions of both acids was noted, and an assumption was made about the presence of uniform deformation stresses during gel shrinkage. A microscopic study of coatings on the surface of extruded polystyrene foam was conducted, and a positive effect of orthophosphate acid on the density of their structure was established. It was determined that the optimal solution for obtaining a uniform coating is the modification of the sol with the help of a 22 % solution of orthophosphate acid. Schemes of the interaction of the silica coating and the polystyrene base in cases of electrostatic interaction and in the case of the formation of covalent bonds between the coating and the polystyrene surface are proposed.

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Section: Fig 2 Scheme Of Hydration Of Final Fragments Of Polystyrene ...mentioning

confidence: 99%

Development of a fire-proof coating containing silica for polystyrene

Lysak,

Skorodumova,

Chernukha

2023

PES

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“…The destruction of concrete and reinforced concrete products and structures under the influence of microorganisms attracts more and more attention of scientists from the point of view of violation of structural integrity and reduction of the service life of bridge structures and various hydraulic structures [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…The more reaction products are dissolved and carried away by the aggressive solution, the faster the concrete is destroyed. Microorganisms dissolve the cement matrix with the leaching of structural elements and their accumulation in the biofilm [1,3].…”

Section: Introductionmentioning

confidence: 99%

Increasing the Biostability of Concrete by the Introduction Of Additives

Rumyantseva,

Konovalova,

Narmaniya

et al. 2023

E3S Web Conf.

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To increase the resistance to fungal corrosion and improve the performance of concrete cement stone, it is proposed to introduce calcium stearate and active metal nitrates in an amount of 0.5% by weight of cement into the cement mixture at the manufacturing stage. To determine the degree of corrosion damage of cement stone by fungal microorganisms Aspergillus niger, porosity, density, water absorption and strength were determined. It has been found that the introduction of a hydrophobic additive of calcium stearate into the cement mixture during the manufacture of concrete reduces water absorption, reduces porosity and increases strength. Additives of nitrates of active metals do not affect the characteristics of the cement stone of concrete. As a result of 6 months of fungal corrosion, the water absorption, porosity and density of cement stone containing calcium stearate did not change, and the strength decreased by 4%. Metal nitrates do not prevent damage to the cement stone by microorganisms, but slow down the flow of aggressive substances to the surface of the reinforcement in concrete. The combined introduction of calcium stearate and nitrates into the cement mixture will improve the characteristics of concrete, increase its corrosion resistance and ensure the safety of reinforcement in concrete.

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