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

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

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.

• Jezik: Angleški jezik
• Ključne besede: dolomite-cement mortars, accelerating ageing conditions, dedolomitisation, hydrotalcite-like phase, interlayer anions replacement
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FKKT - Fakulteta za kemijo in kemijsko tehnologijo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Datum objave: 01.01.2023
• Leto izida: 2023
• Št. strani: Str. 371-379
• Številčenje: Vol. 70, no. 3
• PID: 20.500.12556/RUL-153108
• UDK: 666.971.4
• ISSN pri članku: 1580-3155
• DOI: 10.17344/acsi.2022.7907
• COBISS.SI-ID: 177681923
• Datum objave v RUL: 18.12.2023

Gradivo je del revije

• Naslov: Acta chimica slovenica
• Skrajšan naslov: Acta chim. slov.
• Založnik: Slovensko kemijsko društvo, =Slovenian Chemical Society
• ISSN: 1580-3155
• COBISS.SI-ID: 21870085

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: dolomitno cementne malte, pogoji pospešenega staranje, dedolomitizacija, hidrotalcitne faze, anionska medplastna izmenjava

Projekti

• Financer: ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
• Številka projekta: P1-0175
• Naslov: Napredna anorganska kemija