Number of the records: 1

Red-clay ceramic powders as geopolymer precursors: Consideration of amorphous portion and CaO content

SYSNO ASEP	0489350
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Red-clay ceramic powders as geopolymer precursors: Consideration of amorphous portion and CaO content
Author(s)	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)
Number of authors	10
Source Title	Applied Clay Science. - : Elsevier - ISSN 0169-1317 Roč. 161, SEP (2018), s. 82-89
Number of pages	8 s.
Language	eng - English
Country	NL - Netherlands
Keywords	Amorphous content ; Calcium oxide ; Composition ; Geopolymers ; Red-clay ceramics
Subject RIV	CA - Inorganic Chemistry
OECD category	Inorganic and nuclear chemistry
Institutional support	UACH-T - RVO:61388980
UT WOS	000436916600011
EID SCOPUS	85045702890
DOI	10.1016/j.clay.2018.04.019
Annotation	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.
Workplace	Institute of Inorganic Chemistry
Contact	Jana Kroneislová, krone@iic.cas.cz, Tel.: 311 236 931
Year of Publishing	2019

Number of the records: 1