Detail publikace

Alkaline activation of low-reactivity ceramics: Peculiarities induced by the precursors' dual character

FOŘT, J. VEJMELKOVÁ, E. KEPPERT, M. ROVNANÍKOVÁ, P. BEZDIČKA, P. ČERNÝ, R.

Originální název

Alkaline activation of low-reactivity ceramics: Peculiarities induced by the precursors' dual character

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

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 nM(2)O center dot pCaO center dot Al2O3 center dot xSiO(2)center dot yH(2)O are derived in dependence on activator alkalinity and curing temperature. The dependence of flexural strength upon Al/(Na+ 1/2 Ca) 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.

Klíčová slova

Low-reactivity ceramics; Alkaline activation; Curing temperature; Composite effects

Autoři

FOŘT, J.; VEJMELKOVÁ, E.; KEPPERT, M.; ROVNANÍKOVÁ, P.; BEZDIČKA, P.; ČERNÝ, R.

Vydáno

20. 1. 2020

Nakladatel

ELSEVIER SCI LTD

Místo

OXFORD

ISSN

0958-9465

Periodikum

CEMENT & CONCRETE COMPOSITES

Ročník

105

Číslo

105

Stát

Spojené království Velké Británie a Severního Irska

Strany od

1

Strany do

9

Strany počet

9

URL

https://reader.elsevier.com/reader/sd/pii/S0958946519312831?token=0F7264B55ABCE1CE2DCE807684B61038D13561731B4807F04C8E01BCC24400FCBA35FCE04369D90706D652C02A8596B4

BibTex

@article{BUT162706,
  author="Jan {Fořt} and Eva {Vejmelková} and Martin {Keppert} and Pavla {Rovnaníková} and Petr {Bezdička} and Robert {Černý}",
  title="Alkaline activation of low-reactivity ceramics: Peculiarities induced by the precursors' dual character",
  journal="CEMENT & CONCRETE COMPOSITES",
  year="2020",
  volume="105",
  number="105",
  pages="1--9",
  doi="10.1016/j.cemconcomp.2019.103440",
  issn="0958-9465",
  url="https://reader.elsevier.com/reader/sd/pii/S0958946519312831?token=0F7264B55ABCE1CE2DCE807684B61038D13561731B4807F04C8E01BCC24400FCBA35FCE04369D90706D652C02A8596B4"
}