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

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.

Keywords

dolomite-cement mortars;accelerating ageing conditions;dedolomitisation;hydrotalcite-like phase;interlayer anions replacement;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FKKT - Faculty of Chemistry and Chemical Technology
UDC: 666.971.4
COBISS: 177681923 Link will open in a new window
ISSN: 1580-3155
Views: 10
Downloads: 0
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Other data

Secondary language: Slovenian
Secondary keywords: dolomitno cementne malte;pogoji pospešenega staranje;dedolomitizacija;hidrotalcitne faze;anionska medplastna izmenjava;
Type (COBISS): Article
Pages: str. 371-379
Volume: ǂVol. ǂ70
Issue: ǂno. ǂ3
Chronology: 2023
DOI: 10.17344/acsi.2022.7907
ID: 21815786