Characterization of Czech coal combustion ashes and their hydrated products

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F19%3A43918791" target="_blank" >RIV/60461373:22310/19:43918791 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60461373:22810/19:43918791

Výsledek na webu

<a href="https://www.tretiruka.cz/media-a-odpady/waste-forum/archiv/a2019/waste-forum-3-2019/" target="_blank" >https://www.tretiruka.cz/media-a-odpady/waste-forum/archiv/a2019/waste-forum-3-2019/</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Characterization of Czech coal combustion ashes and their hydrated products

Popis výsledku v původním jazyce

Czech coal ashes and their hydrated products were characterized primary by X-ray diffraction analysis (XRD), followed by X-ray fluorescence analysis (XRF) and scanning electron microscopy (SEM). The aim of this paper was to determine the phase composition including an amorphous content in the selected pulverized coal combustion ashes (PCC FA), sulfocalcic ashes (SC ash, CFBC ash) and in hardened SC ash slurries. Amorphous phase was determined by the internal standard method using XRD. The phase composition of the slurries and its changes occurring during the time-dependent hydration were studied within 90 days. The results showed different phase composition of both types of ashes. It was found that the selected PCC ashes had about 55% of amorphous content and the SC ashes from 47 to 65%. The phase changes could be observed during the first 7 days of hydration by XRD analysis, then the phase composition remained practically constant until the observed 90 days. For the hydrated slurries, the amorphous content was time independent and ranged from 57 – 64%. Furthermore, it was found that the amount of ettringite and the amount of amorphous phase is affected by the amount of water; the higher the water to binder ration, the higher amount of the ettringite and the lower amount of the amorphous phase, respectively. © 2019 Czech Environment Management Center. All rights reserved.

Název v anglickém jazyce

Characterization of Czech coal combustion ashes and their hydrated products

Popis výsledku anglicky

Czech coal ashes and their hydrated products were characterized primary by X-ray diffraction analysis (XRD), followed by X-ray fluorescence analysis (XRF) and scanning electron microscopy (SEM). The aim of this paper was to determine the phase composition including an amorphous content in the selected pulverized coal combustion ashes (PCC FA), sulfocalcic ashes (SC ash, CFBC ash) and in hardened SC ash slurries. Amorphous phase was determined by the internal standard method using XRD. The phase composition of the slurries and its changes occurring during the time-dependent hydration were studied within 90 days. The results showed different phase composition of both types of ashes. It was found that the selected PCC ashes had about 55% of amorphous content and the SC ashes from 47 to 65%. The phase changes could be observed during the first 7 days of hydration by XRD analysis, then the phase composition remained practically constant until the observed 90 days. For the hydrated slurries, the amorphous content was time independent and ranged from 57 – 64%. Furthermore, it was found that the amount of ettringite and the amount of amorphous phase is affected by the amount of water; the higher the water to binder ration, the higher amount of the ettringite and the lower amount of the amorphous phase, respectively. © 2019 Czech Environment Management Center. All rights reserved.

Druh

J_SC - Článek v periodiku v databázi SCOPUS

CEP obor

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OECD FORD obor

20501 - Materials engineering

Projekt

<a href="/cs/project/FV30062" target="_blank" >FV30062: Možnosti využití deponovaných popílků z uhelných elektráren</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Waste forum

ISSN

1804-0195

e-ISSN

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Svazek periodika

2019

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

11

Strana od-do

276-286

Kód UT WoS článku

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EID výsledku v databázi Scopus

2-s2.0-85072552929