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Formation and evolution of the hydrotalcite-like phase during ageing of dolomite-cement mortars under various conditions
ID Sutormina, Elena (Author), ID Marinšek, Marjan (Author), ID Meden, Anton (Author)

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Abstract
This work considers the reactions of dolomite powder mixed with Portland cement during ageing under accelerating conditions (60 °C, water or alkaline medium). The phase composition and microstructure of cement-dolomite mortars were studied using X-ray diffraction (XRD), thermogravimetric analysis (TGA), and scanning electron microscopy with X-ray microanalysis (SEM-EDS). The results showed that the alkalinity of the medium increased the dolomite reaction degree but did not affect the reaction products’ composition. The formation of the hydrotalcite-like phase with the gen-eral formula $Mg_4Al_2(CO_3)_{1−x}(OH)_{12+2x}·nH_2O$ proved to be the predominant route of dolomite consumption in the pres-ence of available aluminium in the hardened cement paste. Then, after three months of ageing, an interlayer anions re-placement became noticeable: carbonate anions in the structure of hydrotalcite are gradually replaced by hydroxide ones.

Language:English
Keywords:dolomite-cement mortars, accelerating ageing conditions, dedolomitisation, hydrotalcite-like phase, interlayer anions replacement
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FKKT - Faculty of Chemistry and Chemical Technology
Publication status:Published
Publication version:Version of Record
Publication date:01.01.2023
Year:2023
Number of pages:Str. 371-379
Numbering:Vol. 70, no. 3
PID:20.500.12556/RUL-153108 This link opens in a new window
UDC:666.971.4
ISSN on article:1580-3155
DOI:10.17344/acsi.2022.7907 This link opens in a new window
COBISS.SI-ID:177681923 This link opens in a new window
Publication date in RUL:18.12.2023
Views:161
Downloads:11
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Record is a part of a journal

Title:Acta chimica slovenica
Shortened title:Acta chim. slov.
Publisher:Slovensko kemijsko društvo, =Slovenian Chemical Society
ISSN:1580-3155
COBISS.SI-ID:21870085 This link opens in a new window

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

Language:Slovenian
Keywords:dolomitno cementne malte, pogoji pospešenega staranje, dedolomitizacija, hidrotalcitne faze, anionska medplastna izmenjava

Projects

Funder:ARRS - Slovenian Research Agency
Project number:P1-0175
Name:Napredna anorganska kemija

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