Effect of cyclic wetting and drying on microstructure, composition and length changes of lime-based plasters

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388980%3A_____%2F19%3A00508679" target="_blank" >RIV/61388980:_____/19:00508679 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21110/19:00332833

Výsledek na webu

<a href="http://hdl.handle.net/11104/0299516" target="_blank" >http://hdl.handle.net/11104/0299516</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.cemconcomp.2019.103411" target="_blank" >10.1016/j.cemconcomp.2019.103411</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Effect of cyclic wetting and drying on microstructure, composition and length changes of lime-based plasters

Popis výsledku v původním jazyce

Plasters as surface layers of building structures are often exposed to cyclic wetting and drying during their service life. In this paper, the impact of cyclic wetting and drying on microstructure, composition, and length changes of lime-based plasters is investigated using mercury intrusion porosimetry, optical microscopy, qualitative and quantitative X-ray diffraction analysis, simultaneous thermal analysis, and contact dilatometry. Lime-cement- and lime-metakaolin plasters as typical representatives of this group are saturated by water at first and then subjected to five consecutive drying-wetting cycles. Hydration processes, together with carbonation and possible partial dissolution of portlandite and calcite after immersion of samples in water, are identified as the most important reactions affecting the microstructure and composition of the lime-cement plaster, while for the lime-metakaolin plaster the pozzolanic reaction resulting in monocarbonate production, together with possible portlandite and calcite dissolution, are probably the most significant factors. The measurements of hygric strain show that the wetting-drying process is near-reversible since the beginning of the second cycle, whereas capillary pressure is the dominant shrinkage/swelling mechanism.

Název v anglickém jazyce

Effect of cyclic wetting and drying on microstructure, composition and length changes of lime-based plasters

Popis výsledku anglicky

Plasters as surface layers of building structures are often exposed to cyclic wetting and drying during their service life. In this paper, the impact of cyclic wetting and drying on microstructure, composition, and length changes of lime-based plasters is investigated using mercury intrusion porosimetry, optical microscopy, qualitative and quantitative X-ray diffraction analysis, simultaneous thermal analysis, and contact dilatometry. Lime-cement- and lime-metakaolin plasters as typical representatives of this group are saturated by water at first and then subjected to five consecutive drying-wetting cycles. Hydration processes, together with carbonation and possible partial dissolution of portlandite and calcite after immersion of samples in water, are identified as the most important reactions affecting the microstructure and composition of the lime-cement plaster, while for the lime-metakaolin plaster the pozzolanic reaction resulting in monocarbonate production, together with possible portlandite and calcite dissolution, are probably the most significant factors. The measurements of hygric strain show that the wetting-drying process is near-reversible since the beginning of the second cycle, whereas capillary pressure is the dominant shrinkage/swelling mechanism.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10402 - Inorganic and nuclear chemistry

Projekt

<a href="/cs/project/GA17-01365S" target="_blank" >GA17-01365S: Modelování a experimentální ověření vlivu zmrazovacích cyklů na degradaci porézních stavebních materiálů</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Cement and Concrete Composites

ISSN

0958-9465

e-ISSN

—

Svazek periodika

104

Číslo periodika v rámci svazku

NOV

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

11

Strana od-do

103411

Kód UT WoS článku

000501649500073

EID výsledku v databázi Scopus

2-s2.0-85071874804