Effect of chitosan ethers on fresh state properties of lime mortars

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dc.contributor.authorVyšvařil, Martincs
dc.contributor.authorŽižlavský, Tomášcs
dc.coverage.issue1cs
dc.coverage.volume251cs
dc.date.accessioned2018-12-06T18:59:51Z
dc.date.available2018-12-06T18:59:51Z
dc.date.issued2017-10-25cs
dc.description.abstractThe fresh state properties of mortars are eminently important since determine the material workability and also have a great influence on its hardened state characteristics. In this paper, the behaviour of fresh lime mortars modified by etherified derivatives of chitosan (hydroxypropylchitosan (HPCH) and carboxymethylchitosan (CMCH)) is assessed with the purpose of exploring a new application of such derivatives as lime mortar admixtures. The rheological parameters (relative yield stress, consistency coefficient and fluidity index) and viscoelastic properties were correlated with flow table tests, relative density measurements, water retention abilities of mortars and air content in mortars. Results were seen to be strongly dependent on substituents of the chitosan. Non-ionic derivative (HPCH) had a plasticizing influence on the mortars; the ionic CMCH showed the thickening effect. The effect of chitosan ethers was found to be dosage-dependent. CMCH had low impact on water retention, while HPCH displayed high water retention capability. It was concluded, that the ionic derivative (CMCH) is very similar by its viscosity enhancing effect to starch ether.en
dc.formattextcs
dc.format.extent1-8cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationIOP Conference Series: Materials Science and Engineering. 2017, vol. 251, issue 1, p. 1-8.en
dc.identifier.doi10.1088/1757-899X/251/1/012039cs
dc.identifier.issn1757-8981cs
dc.identifier.other140851cs
dc.identifier.urihttp://hdl.handle.net/11012/137137
dc.language.isoencs
dc.publisherIOP Publishingcs
dc.relation.ispartofIOP Conference Series: Materials Science and Engineeringcs
dc.relation.urihttp://iopscience.iop.org/article/10.1088/1757-899X/251/1/012039cs
dc.rightsCreative Commons Attribution 3.0 Unportedcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/1757-8981/cs
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/cs
dc.subjectlime mortaren
dc.subjectchitosan ethersen
dc.subjectrheologyen
dc.subjectwater retentionen
dc.subjectair contenten
dc.subjectyield stressen
dc.subjectviscosityen
dc.titleEffect of chitosan ethers on fresh state properties of lime mortarsen
dc.title.alternativeVliv etherů chitosanu na vlastnosti vápenných malt v čerstvém stavucs
dc.type.driverconferenceObjecten
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
sync.item.dbidVAV-140851en
sync.item.dbtypeVAVen
sync.item.insts2020.03.31 00:58:28en
sync.item.modts2020.03.30 22:54:20en
thesis.grantorVysoké učení technické v Brně. Fakulta stavební. Ústav chemiecs
thesis.grantorVysoké učení technické v Brně. Fakulta stavební. AdMaS Divize MSHcs
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