Počet záznamů: 1
Alkaline activation of low-reactivity ceramics: Peculiarities induced by the precursors' dual character
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SYSNO ASEP 0518623 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Alkaline activation of low-reactivity ceramics: Peculiarities induced by the precursors' dual character Tvůrce(i) Fořt, J. (CZ)
Vejmelková, E. (CZ)
Keppert, M. (CZ)
Rovnaníková, P. (CZ)
Bezdička, Petr (UACH-T) SAI, RID, ORCID
Černý, R. (CZ)Celkový počet autorů 6 Číslo článku 103440 Zdroj.dok. Cement and Concrete Composites. - : Elsevier - ISSN 0958-9465
Roč. 105, JAN (2020)Poč.str. 9 s. Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova Alkaline activation ; Composite effects ; Curing temperature ; Low-reactivity ceramics Vědní obor RIV CA - Anorganická chemie Obor OECD Inorganic and nuclear chemistry Způsob publikování Open access s časovým embargem (01.01.2022) Institucionální podpora UACH-T - RVO:61388980 UT WOS 000502883200014 EID SCOPUS 85074146013 DOI 10.1016/j.cemconcomp.2019.103440 Anotace In the alkaline activation process, precursors with high reactivity are mostly used. If low-reactivity materials are utilized, it is necessary to take into account their dual character, i.e., that only their amorphous portion can react and the remaining crystalline part acts as microfiller. The composite character of obtained alkali-activated materials can then induce some peculiarities which are not observed for geopolymers based on high-reactivity precursors. In this paper, alkaline activation of low-reactivity ceramic grinding dust is investigated. Microstructure and phase composition of the prepared aluminosilicates are analyzed at first, and empirical geopolymer formulas in the form nM2O∙pCaO∙Al2O3∙xSiO2∙yH2O are derived in dependence on activator alkalinity and curing temperature. The dependence of flexural strength upon Al/(Na+½Ca) molar ratio calculated for the amorphous portion of the analyzed aluminosilicates is identified as the most distinct feature characterizing the links between microstructure, composition, and properties. The improvement of mechanical properties is related to the enhancement of matrix-aggregate composite effect and refinement of pore structure due to the incorporation of crystalline substances into the aluminosilicate matrix. Pracoviště Ústav anorganické chemie Kontakt Jana Kroneislová, krone@iic.cas.cz, Tel.: 311 236 931 Rok sběru 2021 Elektronická adresa http://hdl.handle.net/11104/0304271
Počet záznamů: 1