Klasyczne i nowoczesne spojrzenie badawcze na procesy hydratacji cementów glinowo-wapniowych

• Autorzy: Madej Dominika , Kruk Andrzej

Identyfikatory

DOI

10.32047/CWB.2023.28.5.3

Warianty tytułu

EN

Classical and new insights into the methodology for characterizing the hydration of calcium aluminate cements

• Języki publikacji: PL EN

Abstrakty

PL

Cementy glinowo-wapniowe [CAC] ze względu na ich unikalne właściwości stosowane są zazwyczaj w konstrukcjach odlewanych w miejscu instalacji oraz w aplikacjach wysokotemperaturowych. Klinkier cementowy CaAl2O4 [CA] oraz klinkier domieszkowany jonami Sm [CA:Sm], otrzymano metodą klasyczną i scharakteryzowano za pomocą proszkowej dyfrakcji rentgenowskiej [XRD], skaningowej mikroskopii elektronowej [SEM] wraz z spektroskopią rentgenowską z dyspersją energii [EDS] oraz spektroskopią luminescencyjną. Analiza dyfraktometryczna ujawniła obecność wyłącznie fazy CaAl2O4. Następnie, klasycznymi metodami badawczymi prześledzono postęp hydratacji obu cementów, w tym kalorymetrii izotermicznej, XRD, SEM oraz technikami najnowocześniejszymi: czasowo rozdzielczą elektrochemiczną spektroskopią impedancyjną [TR-EIS] oraz spektroskopii fotoluminescencyjnej [PS]. Badania TR-EIS przeprowadzono za pomocą Kamery Impedancyjnej w zakresie częstotliwości od 100 Hz do 1 MHz. Ewolucja uzyskanych widm impedancyjnych i widm luminescencyjnych z łatwością wskazała początek formowania nowej fazy stałej oraz kolejnych etapów hydratacji. Dynamikę procesu hydratacji skutecznie zobrazowano poprzez śledzenie zmian intensywności widma luminescencyjnego jonów Sm3+. Obie techniki są ze sobą komplementarne i spójne z klasycznymi metodami badawczymi stosowanymi w chemii cementu, zwłaszcza w badaniach m.in. hydratacji cementów portlandzkich i innych spoiw.

EN

Calcium aluminate cements [CACs] are typically used for cast-in-place structural work and high temperature applications due to their unique properties. The CaAl2O4 [CA] and Sm-doped CaAl2O4 [CA:Sm] cement clinkers obtained by the solid-state reaction were investigated using X-ray powder diffraction [XRD], scanning electron microscopy [SEM] and energy dispersive X-ray spectroscopy [EDS] and luminescence spectroscopy. The XRD result shows that the powders are pure CaAl2O4. As a next step, hydration behavior of as-synthesized cements was investigated by both classical methods including isothermal calorimetry and XRD, and the state-of-the-art techniques including time resolved electrochemical impedance spectroscopy [TR-EIS] and luminescence spectroscopy. The TR-EIS investigations were obtained by the Impedance Camera over the range of 100 Hz to 1 MHz frequencies. The evolution of obtained EIS and luminescence spectra easily manifested the beginning of the new solid formation and the hydration kinetics. The dynamics of hydration processes were also successfully traced by the changes of the luminescence intensity from the Sm3+ ions. This technique seems to be complementary, and consistent with other methods implemented in the cement chemistry, especially to investigate e.g. hydration of ordinary Portland cements [OPCs] and other binders.

Słowa kluczowe

PL

cement glinowo-wapniowy; hydratacja; luminescencja; spektroskopia elektrochemiczna impedancyjna

EN

calcium aluminate cement; hydration; luminescence; electrochemical impedance spectroscopy

• Wydawca: Fundacja Cement, Wapno, Beton
• Czasopismo: Cement Wapno Beton
• Rocznik: 2023
• Tom: R. 28, nr 5
• Strony: 318--338
• Opis fizyczny: Bibliogr. 28 poz., il., tab.

Twórcy

autor

Madej Dominika

• AGH University of Krakow, Faculty of Materials Science and Ceramics, Department of Ceramics and Refractories, Krakow, Poland

autor

Kruk Andrzej

• University of the National Education Commission, Institute of Technology, Kraków, Poland

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2024).