Detail publikace

Long-term mechanical properties of lime-pozzolan mortars: The role of amorphous Al2O3

VYŠVAŘIL, M. ŽIŽLAVSKÝ, T. DVOŘÁK, K. SPYCHAL, E.

Originální název

Long-term mechanical properties of lime-pozzolan mortars: The role of amorphous Al2O3

Typ

článek ve sborníku mimo WoS a Scopus

Jazyk

angličtina

Originální abstrakt

Today, lime-pozzolan mortars are being used in the repair of historic buildings, replacing the lime-cement mortars that were previously used in this practice, but were incompatible with historic mortars. It has been observed in laboratory research and also in practice that some lime-pozzolan mortars can lose strength over time. The cause of this behaviour is not fully understood, but the main reason seems to be the instability and breakdown of the aluminate phases. In this paper, the role of amorphous Al2O3 content in pozzolans on the long-term mechanical properties of lime-pozzolan mortars is studied. Lime-pozzolan mortars with 40% replacement of lime with pozzolans with different contents of amorphous Al2O3 (metakaolin, pumice, pozzolanic earth, trass, zeolite) were prepared and the changes in strength, porosity and mineralogical composition of the mortars (determined by XRD and TG/DTA) over time were monitored. Mortars containing pozzolans with a high content of amorphous Al2O3 (over 30% by weight) showed a dramatic decrease in strength, changes in porosity and a decrease in the content of monocarboaluminate (C4AcH11) with a simultaneous increase in the content of vaterite and aragonite. The negative effects of carbonation of the aluminate phases are particularly evident in pozzolans with a high content of amorphous Al2O3.

Klíčová slova

lime-pozzolan mortar; amorphous Al2O3, metakaolin, monocarboaluminate; decrease in strength; carbonation

Autoři

VYŠVAŘIL, M.; ŽIŽLAVSKÝ, T.; DVOŘÁK, K.; SPYCHAL, E.

Vydáno

16. 9. 2024

Nakladatel

MATEC Web of Conferences

ISSN

2261-236X

Periodikum

MATEC Web of Conferences

Ročník

403

Stát

Francouzská republika

Strany počet

13

BibTex

@inproceedings{BUT190094,
  author="Martin {Vyšvařil} and Tomáš {Žižlavský} and Karel {Dvořák} and Edyta {Spychal}",
  title="Long-term mechanical properties of lime-pozzolan mortars: The role of amorphous Al2O3",
  booktitle="SUBLime Conference 2024 – Towards the Next Generation of Sustainable Masonry Systems: Mortars, Renders, Plasters and Other Challenges
",
  year="2024",
  journal="MATEC Web of Conferences",
  volume="403",
  pages="13",
  publisher="MATEC Web of Conferences",
  doi="https://doi.org/10.1051/matecconf/202440302009",
  issn="2261-236X"
}