Publication detail

Bond Properties of NHL-Based Mortars with Viscosity-Modifying Water-Retentive Admixtures

ŽIŽLAVSKÝ, T. BAYER, P. VYŠVAŘIL, M.

Original Title

Bond Properties of NHL-Based Mortars with Viscosity-Modifying Water-Retentive Admixtures

Type

journal article in Web of Science

Language

English

Original Abstract

This article studies the influence of biopolymeric viscosity-modifying admixtures with water-retentive function on the physico-mechanical properties of natural hydraulic lime-based mortars and their adherence to the traditional fired-clay brick substrate. The use of admixtures increases the water/binder ratio, which in turn leads to a decrease in the strength of the mortars. The viscosity-modifying function improves the adhesive strength between mortar and pre-wetter brick by increasing the binder paste viscosity, while the water-retentive function along with increased water content may lead to a decrease in adhesive strength. On the contrary, water retention and increased water content are beneficial on a dry surface, while paste viscosity plays only a minor role. When subjected to temperature-varying cycles, the mortars are more prone to in-mortar failure during the pull-off test. The air-entraining function of some admixtures improves the frost resistance of the mortars; however, it would negatively affect the adhesive strength by incorporating pores into the contact zone between the mortar and brick substrate. This study showed that the use of some of the studied admixtures may improve the adhesion of mortar to the brick substrate.

Keywords

NHL-based mortar; viscosity-modifying admixture; water retention; air content; adhesive strength; flexural strength; compressive strength; porosity; hygric properties; contact zone

Authors

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

Released

25. 6. 2021

Publisher

MDPI

Location

Basel, Switzerland

ISBN

2075-163X

Periodical

Minerals

Year of study

11

Number

7

State

Swiss Confederation

Pages from

1

Pages to

16

Pages count

16

URL

https://www.mdpi.com/2075-163X/11/7/685

Full text in the Digital Library

http://hdl.handle.net/11012/200959

BibTex

@article{BUT171901,
  author="Tomáš {Žižlavský} and Patrik {Bayer} and Martin {Vyšvařil}",
  title="Bond Properties of NHL-Based Mortars with Viscosity-Modifying Water-Retentive Admixtures",
  journal="Minerals",
  year="2021",
  volume="11",
  number="7",
  pages="1--16",
  doi="10.3390/min11070685",
  issn="2075-163X",
  url="https://www.mdpi.com/2075-163X/11/7/685"
}