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

Kód výsledku v 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>

Nalezeny alternativní kódy

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

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10402 - Inorganic and nuclear chemistry

Projekt

<a href="/cs/project/GA19-01982S" target="_blank" >GA19-01982S: Alkalicky aktivované aluminosilikátové kompozity na bázi keramických prekurzorů</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

Cement and Concrete Composites

ISSN

0958-9465

e-ISSN

—

Svazek periodika

105

Číslo periodika v rámci svazku

JAN

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

9

Strana od-do

103440

Kód UT WoS článku

000502883200014

EID výsledku v databázi Scopus

2-s2.0-85074146013