Crystallization and dissolution of common salts - damage potential to porous media

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378297%3A_____%2F18%3A00490642" target="_blank" >RIV/68378297:_____/18:00490642 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1007/978-3-319-91989-8_2" target="_blank" >https://doi.org/10.1007/978-3-319-91989-8_2</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/978-3-319-91989-8_2" target="_blank" >10.1007/978-3-319-91989-8_2</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Crystallization and dissolution of common salts - damage potential to porous media

Popis výsledku v původním jazyce

Growing crystals of soluble salts could cause degradation of porous building materials due to generation of crystallization pressure inducing tensile stress inside porous system. Considerable damage potential has been observed in case of sodium sulfate through phase change and rapid formation of hydrated phase mirabilite from highly supersaturated solution rising from dissolution of anhydrous phase thenardite after changing of surrounding conditions. Crystallization of sodium chloride can also lead to damage but the intensity is not as evident in comparison with sodium sulfate. The extent of salt attack strongly depends particularly on the environmental conditions and salt content in the material. The morphology of crystals (NaCl, Na2SO4 and mixture of both in ratio 1:1) and phenomena related to dissolution were studied with optical microscope. Conclusions from microscopic observation were applied to real porous system - sandstone subjected to salinization and wetting-drying cycles. The massive damage (>50%) showed the specimen containing single sodium sulfate crystals which are during wetting subjected to phase transition accompanied by volume change. The damage caused by sodium chloride and by mixture was much lower - 1% and 3% respectively. Such low mass change could be explained by greater amount of efflorescence and also by lower damage potential of NaCl and the mixture.

Název v anglickém jazyce

Crystallization and dissolution of common salts - damage potential to porous media

Popis výsledku anglicky

Growing crystals of soluble salts could cause degradation of porous building materials due to generation of crystallization pressure inducing tensile stress inside porous system. Considerable damage potential has been observed in case of sodium sulfate through phase change and rapid formation of hydrated phase mirabilite from highly supersaturated solution rising from dissolution of anhydrous phase thenardite after changing of surrounding conditions. Crystallization of sodium chloride can also lead to damage but the intensity is not as evident in comparison with sodium sulfate. The extent of salt attack strongly depends particularly on the environmental conditions and salt content in the material. The morphology of crystals (NaCl, Na2SO4 and mixture of both in ratio 1:1) and phenomena related to dissolution were studied with optical microscope. Conclusions from microscopic observation were applied to real porous system - sandstone subjected to salinization and wetting-drying cycles. The massive damage (>50%) showed the specimen containing single sodium sulfate crystals which are during wetting subjected to phase transition accompanied by volume change. The damage caused by sodium chloride and by mixture was much lower - 1% and 3% respectively. Such low mass change could be explained by greater amount of efflorescence and also by lower damage potential of NaCl and the mixture.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20501 - Materials engineering

Projekt

<a href="/cs/project/GBP105%2F12%2FG059" target="_blank" >GBP105/12/G059: Kumulativní časově závislé procesy ve stavebních materiálech a konstrukcích</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Proceedings of the first International conference on theoretical, applied and experimental mechanics

ISBN

978-3-319-91988-1

ISSN

2522-560X

e-ISSN

—

Počet stran výsledku

6

Strana od-do

8-13

Název nakladatele

Springer

Místo vydání

Cham

Místo konání akce

Paphos

Datum konání akce

17. 6. 2018

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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