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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388980%3A_____%2F20%3A00518623" target="_blank" >RIV/61388980:_____/20:00518623 - isvavai.cz</a>

Alternative codes found

RIV/68407700:21110/20:00336460 RIV/00216305:26110/20:PU135847

Result on the web

<a href="http://hdl.handle.net/11104/0304271" target="_blank" >http://hdl.handle.net/11104/0304271</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.cemconcomp.2019.103440" target="_blank" >10.1016/j.cemconcomp.2019.103440</a>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10402 - Inorganic and nuclear chemistry

Project

<a href="/en/project/GA19-01982S" target="_blank" >GA19-01982S: Alkali activated aluminosilicate composites based on ceramic precursors</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Cement and Concrete Composites

ISSN

0958-9465

e-ISSN

—

Volume of the periodical

105

Issue of the periodical within the volume

JAN

Country of publishing house

GB - UNITED KINGDOM

Number of pages

9

Pages from-to

103440

UT code for WoS article

000502883200014

EID of the result in the Scopus database

2-s2.0-85074146013