Formation and evolution of the hydrotalcite-like phase during ageing of dolomite-cement mortars under various conditionsSutormina, Elena (Avtor) Marinšek, Marjan (Avtor) Meden, Anton (Avtor) dolomite-cement mortarsaccelerating ageing conditionsdedolomitisationhydrotalcite-like phaseinterlayer anions replacementThis 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.20232023-12-18 10:36:46Članek v reviji153108sl