The study of polyester-acrylate composite’s stability in the humid maritime operating conditions

Erofeev, Vladimir; Smirnov, V.F.; Myshkin, Anton

doi:10.1016/j.matpr.2019.07.547

Cited by 12 publications

(6 citation statements)

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“…Evaluation of sample fouling by microorganisms was carried out with the subsequent exposure to them in an open area of the Black Sea coast (Novorossiysk). It is known that the action of various climatic factors leads to a change in the composition and structure of building materials [7,16,17,18,19]. Under these conditions, the species composition of microorganisms involved in destructive processes also changes [6,16].…”

Section: Resultsmentioning

confidence: 99%

“…In many buildings and structures, along with physical and chemical influences, the structures can undergo microbiological damage [1,2,3,4]. The risk of biodeterioration increases with the increased humidity of the environment, as well as with contact of materials with an aggressive environment [5,6,7]. Biodeterioration is enhanced by the materials and products' aging [8,9,10,11].…”

Section: Introductionmentioning

confidence: 99%

“…In the sea coast constructions (moorings, lowering wells, etc. ), the structures are exposed to sea water, salt fog, high humidity, and ultraviolet radiation [7,12]. Depending on the climatic conditions that vary with the time of year, the objects' geographical location, the individual factors' impact degree is different.…”

Section: Introductionmentioning

confidence: 99%

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Cement Composites’ Biostability

Rodin

Karpushin

Smirnov

2020

MSF

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The studies to establish the species composition of micro-mycetes inhabiting the surface of cement composites after aging in sea water have been carried out. Cement stone made on the basis of Portland cement clinker, a mineral additive and a fungicidal preparation was considered as the studied material. To determine the materials’ fouling by microorganisms, their species composition, imprints and sampling methods were used. A change in the species composition of mycobiota isolated from the cement composites’ surface modified with sodium sulfate and sodium fluoride depending on the amount of active filler, gypsum, and biocidal additives was experimentally revealed. The effectiveness of using the biocidal cement composites with an active mineral additive has been confirmed. It was found that the composites on the developed compositions showed higher resistance compared to the materials on ordinary cement. The compositions modified with biocidal additives showed a fungicidal effect.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cement Composites’ Biostability

Rodin

Karpushin

Smirnov

2020

MSF

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“…Pore space thermal conductivity λ12, filled with vapor-air mixture with thermal conductivity λ1 and heat transfer fluid λ2, can be determined by the formula (16) [19]: Calculation of the thermal conductivity of saline building material is different for fully moistened material and for dry and partially moistened material. In the first case, the calculation is performed according to the formula (11), in the second -according to the formula (17) [19]:…”

Section: The Change In Thermal Conductivity Of the Vapor-air Mixture ...mentioning

confidence: 99%

“…The presence of salts reduces the structures' durability. The increased humidity of a saline building material is a favorable environment for reproduction of various microorganisms that cause biodeterioration on the surface and inside the wall structure [10,11].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Salts’ Presence in the Materials on their Moisture and Thermal Conductivity

Elchishcheva

Erofeev

2020

MSF

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Energy saving in buildings is largely determined by the energy efficiency of the external building envelopes. The latter, as a rule, are the multilayer and incorporate structural and heat-insulating layers. The presence of individual hygroscopic salts and their mixtures in building materials changes their physical and chemical properties. Due to the increase in the sorption properties of building materials and changes in the inter-pore substance composition, humidity increases and the heat-protective properties decrease. This paper presents the results of the experimental and theoretical studies on the salts’ effect assessment on the change in moisture content and thermal conductivity of building materials due to the salt solutions and crystals’ presence in the pore space. To study the saline building materials’ thermal conductivity, the mathematical modeling methods using the theory of flow and bringing the materials’ structure to a unit cell are used. It is shown that the change in thermal conductivity occurs due to the crystalline salt precipitation from the solutions in the material’s pores, to the changes in their initial chemical properties, to the changes in the properties of the vapor-air mixture above the salt solutions due to diffusion. The results obtained make it possible to establish the hygroscopic salts’ influence significance in solid and liquid phases on the building materials’ thermal conductivity. A scheme for determining the thermal conductivity of building materials is proposed, taking into account salt effects, including the determination of: the components’ volume concentrations; sequentially the thermal conductivity of the material’s shell; salt crystals, a solid phase consisting of the material’s shell and crystalline salt, a binary and multicomponent saline solution, the pore space and the pore substance inside. The general formula for determining the thermal conductivity of a saline building material is given.

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