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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
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" }