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dc.creatorLasheras-Zubiate, M. (María)-
dc.creatorNavarro-Blasco, I. (Iñigo)-
dc.creatorFernandez-Alvarez, J.M. (José María)-
dc.creatorAlvarez-Galindo, J. I. (José Ignacio)-
dc.date.accessioned2013-01-30T17:36:04Z-
dc.date.available2013-01-30T17:36:04Z-
dc.date.issued2012-09-02-
dc.identifier.citationLasheras-Zubiate M, Navarro-Blasco I, Fernández JM, Álvarez JI. Effect of the addition of chitosan ethers on the fresh state properties of cement mortars. Cement and Concrete Composites 2012 9;34(8):964-973es_ES
dc.identifier.issn0958-9465-
dc.identifier.urihttp://hdl.handle.net/10171/27725-
dc.description.abstractThe effect of two non-ionic chitosan derivatives (hydroxypropyl (HPCH) and hydroxyethyl (HECH) chitosans) and one ionic derivative (carboxymethylchitosan, CMCH) on the fresh-state properties of cement mortars was studied. Zeta potential measurements and particle size distribution were carried out in order to elucidate the action mechanism of the admixtures. Results were seen to be strongly dependent on substituents of the chitosan. Non-ionic derivatives had a weak dosage-related influence on the fresh-state properties. The ionic CMCH showed the more marked effect: it was found to act as a powerful thickener and to reduce the workable life of the fresh mixtures, whereas it caused a delay in the hydration of the cement particles. CMCH reduced the slump by 50% while commercial viscosity enhancers exhibiting larger molecular weights (hydroxypropylmethylcellulose, HPMC, and hydroxypropyl guaran, HPG) only reduced it by ca. 25%. The negative values of zeta-potential and the strong flocculating effect point to an adsorption of CMCH onto the positively charged cement particles. Optical microscopy and TEM observations showed the polymer giving rise to interlinking between cement particles.es_ES
dc.language.isoenges_ES
dc.publisherElsevieres_ES
dc.rightsinfo:eu-repo/semantics/openAccesses_ES
dc.subjectEtherified chitosanses_ES
dc.subjectAdmixtureses_ES
dc.subjectPolymerses_ES
dc.subjectWorkabilityes_ES
dc.subjectParticle size distributiones_ES
dc.subjectTEMes_ES
dc.titleEffect of the addition of chitosan ethers on the fresh state properties of cement mortarses_ES
dc.typeinfo:eu-repo/semantics/articlees_ES
dc.relation.publisherversionhttp://dx.doi.org/10.1016/j.cemconcomp.2012.04.010es_ES
dc.type.driverinfo:eu-repo/semantics/articlees_ES

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