Publication detail

Effect of chitosan ethers on fresh state properties of lime mortars

VYŠVAŘIL, M. ŽIŽLAVSKÝ, T.

Original Title

Effect of chitosan ethers on fresh state properties of lime mortars

Type

conference paper

Language

English

Original Abstract

The 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.

Keywords

lime mortar, chitosan ethers, rheology, water retention, air content, yield stress, viscosity

Authors

VYŠVAŘIL, M.; ŽIŽLAVSKÝ, T.

Released

25. 10. 2017

Publisher

IOP Publishing

ISBN

1757-8981

Periodical

IOP Conference Series: Materials Science and Engineering

Year of study

251

Number

1

State

United Kingdom of Great Britain and Northern Ireland

Pages from

1

Pages to

8

Pages count

8

URL

http://iopscience.iop.org/article/10.1088/1757-899X/251/1/012039

Full text in the Digital Library

http://hdl.handle.net/11012/137137

BibTex

@inproceedings{BUT140851,
  author="Martin {Vyšvařil} and Tomáš {Žižlavský}",
  title="Effect of chitosan ethers on fresh state properties of lime mortars
",
  booktitle="3rd International Conference on Innovative Materials, Structures and Technologies (IMST 2017)",
  year="2017",
  journal="IOP Conference Series: Materials Science and Engineering",
  volume="251",
  number="1",
  pages="1--8",
  publisher="IOP Publishing",
  doi="10.1088/1757-899X/251/1/012039",
  issn="1757-8981",
  url="http://iopscience.iop.org/article/10.1088/1757-899X/251/1/012039"
}