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

Kód výsledku v 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>

Nalezeny alternativní kódy

RIV/00216224:14310/25:00142104

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Construction and Building Materials

ISSN

0950-0618

e-ISSN

1879-0526

Svazek periodika

—

Číslo periodika v rámci svazku

492

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

13

Strana od-do

143034

Kód UT WoS článku

001558375800001

EID výsledku v databázi Scopus

2-s2.0-105012863517