Formation and evolution of the hydrotalcite-like phase during ageing of dolomite-cement mortars under various conditions

Sutormina, Elena (author), Marinšek, Marjan (author), Meden, Anton (author)

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
• UDC: 666.971.4
• ISSN on article: 1580-3155
• DOI: 10.17344/acsi.2022.7907
• COBISS.SI-ID: 177681923
• Publication date in RUL: 18.12.2023

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

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