The peculiarities of mayenite formation from synthetic katoite and calcium monocarboaluminate samples in temperature range 25–1150 °C

Eisinas, Anatolijus; Dambrauskas, Tadas; Baltakys, K.; Ruginyte, K.

doi:10.1007/s10973-019-08482-4

Cited by 16 publications

(4 citation statements)

References 25 publications

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“…Katoite was identified in a signal at 3660 cm -1 , visible only on the 20%MK and 25%MK spectra, and the narrowing of the peak at 860 cm -1 , more intensely at the higher replacement ratio [49]. Nonetheless, as C3AH6 also generates a signal at 3660 cm -1 , that peak might be attributable to the formation of both aforementioned minerals [50].…”

Section: Ft-ir-determined Mineralogymentioning

confidence: 99%

New scientific evidence of the effect of high temperatures and long curing times on MK-blended cement paste mineralogy

Frı́as

Martínez-Ramírez

Villa

et al. 2022

Cement and Concrete Research

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Section: Ft-ir-determined Mineralogymentioning

confidence: 99%

New scientific evidence of the effect of high temperatures and long curing times on MK-blended cement paste mineralogy

Frı́as

Martínez-Ramírez

Villa

et al. 2022

Cement and Concrete Research

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“…In addition, calcite (COD 9000966) was identified at a low concentration because of the calciumbased reagent impurity and also some inevitable sample carbonation that may occur. As previously reported [15,16,18], the synthesis method used here is simpler than those used in other studies, where the latter obtained katoite through hydrothermal synthesis [21,22] or the production of tricalcium aluminate [12,23].…”

Section: Results and Discussion Xrf And Xrd Analysesmentioning

confidence: 99%

Rehydration of katoite as a layered double hydroxide: an in situ study

et al. 2021

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Calcium aluminate layered double hydroxides (Ca-Al LDHs) constitute a considerable part of cementitious waste fines. Although cementitious waste fines have proven to be recyclable by thermal treatment at moderate temperatures (400–700 °C), understanding how each phase rehydrates and contributes to the binding properties of rehydrated cementitious materials is still necessary. In this study, the de(re)hydration of katoite is investigated through in situ techniques, and its applicability as an alternative cement or supplementary cementitious material (SCM) is discussed. The research employed X-ray diffraction, isothermal calorimetry, in situ wide-angle X-ray scattering (WAXS), and rotational/oscillatory rheometry. Katoite synthesized by a mechanochemical process was dehydrated at 400 °C, producing mainly mayenite. During rehydration, calorimetry presents high heat production in the first minutes. WAXS shows prompt recovery of katoite and increasing formation of monocarboaluminate (Ca-Al LDH) after 30 s of rehydration. The findings confirm the direct association between rapid heat release and phase reformation. Rehydrated pastes present a high yield stress and an increasing storage modulus, indicating rapid binding properties. The consolidation is also correlated with cumulative heat and monocarboaluminate formation. The results indicate the potential of calcined katoite for use as rapid set alternative cement or SCM.

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“…The ML in these ranges are as follow (Table 5) I st range-1.00-1.53%, II nd range-0.46-0.91%, III rd range-2.65-7.23%, and IV th range-2.46-31.04%. The distribution of ML in the ranges is related to: -I st range, Dehydratation (40-250 °С) [13,19,[42][43][44][45][46][47][48] Figure 7b shows the thermal behavior of Portland cement, characterized by total ML of just over 5% due to: (i) dehydration of crystal bonded water molecules (up to 220 • C); (ii) Ca(OH) 2 and C-S-H gel dehydroxylation of structural OH-anions; and (iii) dolomite decabonation (most of the mass losses (ML)).…”

Section: Thermal Analysismentioning

confidence: 99%

“…In this temperature range, the dehydroxylation of crystal bonded water molecules in hydrated phases (ettringite, monocarboaluminate, hillebrandite, etc.) occurs [48,[50][51][52][53][54][55][56][57][58].…”

Section: Th Decarbonation and Desulphuration (730-850 °с)mentioning

confidence: 99%

Crystal-Chemical and Thermal Properties of Decorative Cement Composites

et al. 2021

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The advanced tendencies in building materials development are related to the design of cement composites with a reduced amount of Portland cement, contributing to reduced CO2 emissions, sustainable development of used non-renewal raw materials, and decreased energy consumption. This work deals with water cured for 28 and 120 days cement composites: Sample A—reference (white Portland cement + sand + water); Sample B—white Portland cement + marble powder + water; and Sample C white Portland cement + marble powder + polycarboxylate-based water reducer + water. By powder X-ray diffraction and FTIR spectroscopy, the redistribution of CO32−, SO42−, SiO44−, AlO45−, and OH− (as O-H bond in structural OH− anions and O-H bond belonging to crystal bonded water molecules) from raw minerals to newly formed minerals have been studied, and the scheme of samples hydration has been defined. By thermal analysis, the ranges of the sample’s decomposition mechanisms were distinct: dehydration, dehydroxylation, decarbonation, and desulphuration. Using mass spectroscopic analysis of evolving gases during thermal analysis, the reaction mechanism of samples thermal decomposition has been determined. These results have both practical (architecture and construction) and fundamental (study of archaeological artifacts as ancient mortars) applications.

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The peculiarities of mayenite formation from synthetic katoite and calcium monocarboaluminate samples in temperature range 25–1150 °C

Cited by 16 publications

References 25 publications

New scientific evidence of the effect of high temperatures and long curing times on MK-blended cement paste mineralogy

New scientific evidence of the effect of high temperatures and long curing times on MK-blended cement paste mineralogy

Rehydration of katoite as a layered double hydroxide: an in situ study

Crystal-Chemical and Thermal Properties of Decorative Cement Composites

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