Application of secondary calcined shale in the design of low-cement binder for thermal-resistant composites

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F23%3A00362403" target="_blank" >RIV/68407700:21110/23:00362403 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.ceramint.2022.12.220" target="_blank" >https://doi.org/10.1016/j.ceramint.2022.12.220</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ceramint.2022.12.220" target="_blank" >10.1016/j.ceramint.2022.12.220</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Application of secondary calcined shale in the design of low-cement binder for thermal-resistant composites

Popis výsledku v původním jazyce

This paper deals with the possibility of partial replacement of aluminate cement in refractory concretes with waste material from calcined shale production. The waste “metashale” was combined with super-reactive alumina and boehmite powder in order to design a low-cement binder for high-temperature-resistant composites. Designed binders were studied at ambient temperature as well as after exposures to temperatures of 400 °C, 1000 °C and 1400 °C. Firstly, blended binder-based pastes were observed in an electron microscope to determine structural changes in the material, while XRD and DSC characterization was performed as well for determining phase compositions and their changes. Metashale application lead to the creation of different C-A-S-H phases, which were found to be contributing to the higher temperature resistance of designed binders. The further monitored parameters were basic physical and mechanical properties and thermal strain. Despite that the application of metashale caused an increase of porosity at an ambient temperature, the designed low cement binder showed more stable properties during the temperature exposures. Considering the reached properties and the environmental aspects, the most promising mixture was found to be the one, with metashale and cement in a 60:40 ratio. This binder was used to prepare refractory. Because it reached substantially better performance compared to the pure calcium aluminate-based composite, the designed binder proved its applicability.

Název v anglickém jazyce

Application of secondary calcined shale in the design of low-cement binder for thermal-resistant composites

Popis výsledku anglicky

This paper deals with the possibility of partial replacement of aluminate cement in refractory concretes with waste material from calcined shale production. The waste “metashale” was combined with super-reactive alumina and boehmite powder in order to design a low-cement binder for high-temperature-resistant composites. Designed binders were studied at ambient temperature as well as after exposures to temperatures of 400 °C, 1000 °C and 1400 °C. Firstly, blended binder-based pastes were observed in an electron microscope to determine structural changes in the material, while XRD and DSC characterization was performed as well for determining phase compositions and their changes. Metashale application lead to the creation of different C-A-S-H phases, which were found to be contributing to the higher temperature resistance of designed binders. The further monitored parameters were basic physical and mechanical properties and thermal strain. Despite that the application of metashale caused an increase of porosity at an ambient temperature, the designed low cement binder showed more stable properties during the temperature exposures. Considering the reached properties and the environmental aspects, the most promising mixture was found to be the one, with metashale and cement in a 60:40 ratio. This binder was used to prepare refractory. Because it reached substantially better performance compared to the pure calcium aluminate-based composite, the designed binder proved its applicability.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20505 - Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics; filled composites)

Projekt

<a href="/cs/project/GA20-00653S" target="_blank" >GA20-00653S: Fyzikální a chemické procesy v nízkocementových tepelně odolných kompozitech</a><br>

Návaznosti

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

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

Ceramics International

ISSN

0272-8842

e-ISSN

1873-3956

Svazek periodika

49

Číslo periodika v rámci svazku

9

Stát vydavatele periodika

IT - Italská republika

Počet stran výsledku

17

Strana od-do

13452-13468

Kód UT WoS článku

000966435600001

EID výsledku v databázi Scopus

2-s2.0-85148762230