Počet záznamů: 1
Red-clay ceramic powders as geopolymer precursors: Consideration of amorphous portion and CaO content
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SYSNO ASEP 0489350 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Red-clay ceramic powders as geopolymer precursors: Consideration of amorphous portion and CaO content Tvůrce(i) Keppert, M. (CZ)
Vejmelková, E. (CZ)
Bezdička, Petr (UACH-T) SAI, RID, ORCID
Doleželová, M. (CZ)
Čáchová, M. (CZ)
Scheinherrová, L. (CZ)
Pokorný, J. (CZ)
Vyšvařil, M. (CZ)
Rovnaníková, P. (CZ)
Černý, R. (CZ)Celkový počet autorů 10 Zdroj.dok. Applied Clay Science. - : Elsevier - ISSN 0169-1317
Roč. 161, SEP (2018), s. 82-89Poč.str. 8 s. Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova Amorphous content ; Calcium oxide ; Composition ; Geopolymers ; Red-clay ceramics Vědní obor RIV CA - Anorganická chemie Obor OECD Inorganic and nuclear chemistry Institucionální podpora UACH-T - RVO:61388980 UT WOS 000436916600011 EID SCOPUS 85045702890 DOI 10.1016/j.clay.2018.04.019 Anotace Geopolymers are conventionally prepared from metakaolin, fly ash, or blast furnace slag. In this paper, geopolymer synthesis using two different red-clay ceramic powders and a varying amount of Na2O/SiO2 activator is presented. Experimental results show that despite of the high content of crystalline minerals and lower concentration of amorphous matter, both tested precursors enable to prepare geopolymers with satisfactory mechanical properties. The discussion of measured values of compressive strength with respect to SiO2 /Al2O3 and Al2O3 /(Na2O + K2O) ratios in the prepared geopolymer mixes reveals that the consideration of only amorphous portion of ceramics is appropriate. A higher content of CaO in the precursor is found to cause a broader pore size distribution and higher porosity of resulting geopolymers, which is due to the formation of calcium silicate hydrates. Pracoviště Ústav anorganické chemie Kontakt Jana Kroneislová, krone@iic.cas.cz, Tel.: 311 236 931 Rok sběru 2019
Počet záznamů: 1