Effect of monocarboaluminate carbonation on mechanical properties and microstructure of lime-metakaolin mortars

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26110%2F26%3A0198532" target="_blank" >RIV/00216305:26110/26:0198532 - isvavai.cz</a>

Alternative codes found

RIV/00216224:14310/25:00142104

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S095006182503185X" target="_blank" >https://www.sciencedirect.com/science/article/pii/S095006182503185X</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.conbuildmat.2025.143034" target="_blank" >10.1016/j.conbuildmat.2025.143034</a>

Result language

angličtina

Original language name

Effect of monocarboaluminate carbonation on mechanical properties and microstructure of lime-metakaolin mortars

Original language description

In order to improve the properties of fresh and hardened lime mortars, hydraulic or pozzolanic materials have been added to air lime since ancient times. It has been observed through laboratory research and in practice that some lime-pozzolan mortars, especially lime-metakaolin mortars, deteriorate in their properties over time. Although the instability of calcium aluminate hydrates in an alkaline environment has been the main explanation for this deterioration, it can be assumed that the carbonation of the monocarboaluminate also has a significant influence, as confirmed in this paper. The consequences of carbonation of lime-metakaolin mortars with five different types of metakaolin in three doses, with the aim of confirming the carbonation products of monocarboaluminate and determining the influence of the metakaolin composition and its dose on the formation of monocarboaluminate were investigated in the framework of an experimental analysis. The carbonation of monocarboaluminate was confirmed with the formation of metastable forms of calcium carbonate (aragonite and vaterite) and cryptocrystalline aluminum hydroxide, identified mainly by X-ray diffraction analysis, thermogravimetry, 27Al MAS NMR spectroscopy and scanning electron microscopy. As a result of the carbonation of monocarboaluminate, the porosity of the mortars increased because the reaction products have a smaller molar volume than the reactants, resulting in a decrease in flexural and compressive strength. Metakaolin with a higher amorphous Al2O3 content than 29 % may present a risk of deterioration in the properties of lime-metakaolin mortars.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20501 - Materials engineering

Project

—

Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Construction and Building Materials

ISSN

0950-0618

e-ISSN

1879-0526

Volume of the periodical

—

Issue of the periodical within the volume

492

Country of publishing house

GB - UNITED KINGDOM

Number of pages

13

Pages from-to

143034

UT code for WoS article

001558375800001

EID of the result in the Scopus database

2-s2.0-105012863517