Publication detail

Impact of guar gum and chitosan ethers on physico-mechanical properties and durability of natural hydraulic lime mortars

ŽIŽLAVSKÝ, T. VYŠVAŘIL, M. BAYER, P. ROVNANÍKOVÁ, P.

Original Title

Impact of guar gum and chitosan ethers on physico-mechanical properties and durability of natural hydraulic lime mortars

Type

conference paper

Language

English

Original Abstract

The addittion of guar gum derivatives and chitosan ethers has been studied in the natural hydraulic lime (NHL) mortars. These types of polysaccharides can be possibly used as viscosity enhancing admixtures or water retaining agents for the mortars instead of cellulose ethers. The water retention capacity is an essential property of the mortars to enhance the hydration of NHL and mortar adhesion to the substrate. The main part of this study is addressed to the physico-mechanical properties, microstructure, and durability of NHL mortars. The hydroxypropyl- derivatives showed air-entraining function, which is beneficial for the durability of mortars and affects porosity of mortars, as well as water absorption coefficient. The biopolymer addition slightly improved initial flexural strength with the increasing difference for later ages, the only exception being hydroxypropyl guar, which showed slight decrease of flexural strength. Compressive strength decreased by the addition of biopolymeric admixture in all cases; the degree od decrease was dependent on the type and dosage of the admixture.

Keywords

hydraulic lime mortar; guar gum; chitosan ether; air content; water retention; strength; porosity; durability

Authors

ŽIŽLAVSKÝ, T.; VYŠVAŘIL, M.; BAYER, P.; ROVNANÍKOVÁ, P.

Released

16. 7. 2019

Publisher

RILEM Publications S.A.R.L.

Location

Francie

ISBN

978-2-35158-221-3

Book

PRO 130: 5th Historic Mortars Conference

Pages from

1279

Pages to

1290

Pages count

12

BibTex

@inproceedings{BUT157716,
  author="Tomáš {Žižlavský} and Martin {Vyšvařil} and Patrik {Bayer} and Pavla {Rovnaníková}",
  title="Impact of guar gum and chitosan ethers on physico-mechanical properties and durability of natural hydraulic lime mortars",
  booktitle="PRO 130: 5th Historic Mortars Conference",
  year="2019",
  pages="1279--1290",
  publisher="RILEM  Publications S.A.R.L.",
  address="Francie",
  isbn="978-2-35158-221-3"
}