Monitoring of Ion Mobility in the Cement Matrix to Establish Sensitivity to the ASR Caused by External Sources

Simple item page
dc.contributor.authorMarko, Michalcs
dc.contributor.authorHrubý, Petrcs
dc.contributor.authorJanča, Martincs
dc.contributor.authorKřikala, Jakubcs
dc.contributor.authorHajzler, Jancs
dc.contributor.authorŠoukal, Františekcs
dc.contributor.authorVojtíšek, Jancs
dc.contributor.authorDoležal, Martincs
dc.coverage.issue14cs
dc.coverage.volume15cs
dc.date.issued2022-07-06cs
dc.description.abstractThe possibility of the formation of an alkali-silicate reaction (ASR) is a crucial issue for the service life of concrete. The coexistence of key parameters such as the presence of alkalis, reactive SiO2, humidity, and temperature predetermine the possibility of its formation and application. When an ASR gel forms, it results in the concreting cracking and spalling as well as in the deterioration of its overall properties. The risk of ASR depends on the concentration of alkalis and their mobility, which influence their ability to penetrate the concrete. The objective of this study was to determine the ionic mobility of not only Na+ and K+, but Ca2+ as well, from external sources (0.5 and 1.0 mol/L solutions of Na/K carbonate, nitrate, and hydroxide) to a cementitious matrix as the precursor for ASR. The concentrations of ions in both the immersion solutions (ICP) and the cementitious matrix itself (SEM-EDX) were studied as a function of time, from 0 to 120 days, for leaching, and according to temperature (25 and 40 degrees C). The reaction products were characterized using SEM-EDX. Different diffusion rates and behavior were observed depending on the anion type of the external alkali source. Both sodium and potassium ions in all the three environments studied, namely carbonate, hydroxide, and nitrate, penetrated into the composite and further into its structure by different mechanisms. The action of hydroxides, in particular, transformed the original hydration products into calcium-silicate-hydrate (CASH) or ASR gel, while nitrates crystallized in pores and did not cause any changes in the hydration product. The driving force was the increased temperature of the experiment as well as the increased concentration of the solution to which the test specimen was exposed.en
dc.formattextcs
dc.format.extent1-19cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationMaterials . 2022, vol. 15, issue 14, p. 1-19.en
dc.identifier.doi10.3390/ma15144730cs
dc.identifier.issn1996-1944cs
dc.identifier.orcid0000-0003-0384-1609cs
dc.identifier.orcid0000-0002-0369-2984cs
dc.identifier.orcid0000-0002-8641-9624cs
dc.identifier.orcid0000-0002-4776-9517cs
dc.identifier.orcid0000-0002-4875-4309cs
dc.identifier.orcid0000-0002-0234-3467cs
dc.identifier.orcid0000-0002-0434-1385cs
dc.identifier.other177659cs
dc.identifier.researcheridQ-2440-2015cs
dc.identifier.scopus57202956588cs
dc.identifier.scopus57210973875cs
dc.identifier.urihttp://hdl.handle.net/11012/208169
dc.language.isoencs
dc.publisherMDPIcs
dc.relation.ispartofMaterialscs
dc.relation.urihttps://www.mdpi.com/1996-1944/15/14/4730cs
dc.rightsCreative Commons Attribution 4.0 Internationalcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/1996-1944/cs
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/cs
dc.subjectalkali-silicate reactionen
dc.subjectdiffusionen
dc.subjectionic mobilityen
dc.subjectcementen
dc.subjectdegradationen
dc.titleMonitoring of Ion Mobility in the Cement Matrix to Establish Sensitivity to the ASR Caused by External Sourcesen
dc.type.driverarticleen
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
sync.item.dbidVAV-177659en
sync.item.dbtypeVAVen
sync.item.insts2025.02.03 15:38:24en
sync.item.modts2025.01.17 19:34:35en
thesis.grantorVysoké učení technické v Brně. Fakulta chemická. Ústav chemie materiálůcs
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
materials1504730.pdf
Size:
8.71 MB
Format:
Adobe Portable Document Format
Description:
materials1504730.pdf
Download
Collections
Ústav chemie materiálů