Recycling of fly ash and carbide slag in low-carbon cement composites by pre-depolymerization and pre-dissolution treatment

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27360%2F24%3A10256345" target="_blank" >RIV/61989100:27360/24:10256345 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S235271022402970X" target="_blank" >https://www.sciencedirect.com/science/article/pii/S235271022402970X</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jobe.2024.111402" target="_blank" >10.1016/j.jobe.2024.111402</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Recycling of fly ash and carbide slag in low-carbon cement composites by pre-depolymerization and pre-dissolution treatment

Popis výsledku v původním jazyce

The application of high-volume fly ash cement (HVFC) composites is significant for the development of low-carbon building materials, but restricted by poor early and late mechanical properties due to the difficulty in depolymerization of the dense Si-Al network structure on the fly ash (FA) surface without high alkalinity. In this study, aiming to enhance the HVFC performances, a strategy for improving HVFC composites by pre-polymerized FA and pre-dissolved carbide slag waste (CSW) in wet-milling was developed. The mechanochemical process of wet-milling destroyed the Si-Al structure of FA and promoted the leaching of Ca2+ and OH- from CSW, which realizes the pre-polymerization of FA and the pre-dissolution of CSW, producing new phases such as Ca-Al-Cl LDHs and AFt, respectively. The mechanochemical process reduces the reaction threshold between FA and CSW, enabling independent hydration reactions between them. Furthermore, wet milling improves the degree of dissolution of the aluminum phase in FA and OH- in CSW and promotes the Al embedding into the C-S-H gel structure. The early and late compressive strengths of HVFC were greatly improved, with 139 % and 60 % increases in 3 days and 56 days. This work provides feasible strategies to improve the mechanical property limitations of HVFC.

Název v anglickém jazyce

Recycling of fly ash and carbide slag in low-carbon cement composites by pre-depolymerization and pre-dissolution treatment

Popis výsledku anglicky

The application of high-volume fly ash cement (HVFC) composites is significant for the development of low-carbon building materials, but restricted by poor early and late mechanical properties due to the difficulty in depolymerization of the dense Si-Al network structure on the fly ash (FA) surface without high alkalinity. In this study, aiming to enhance the HVFC performances, a strategy for improving HVFC composites by pre-polymerized FA and pre-dissolved carbide slag waste (CSW) in wet-milling was developed. The mechanochemical process of wet-milling destroyed the Si-Al structure of FA and promoted the leaching of Ca2+ and OH- from CSW, which realizes the pre-polymerization of FA and the pre-dissolution of CSW, producing new phases such as Ca-Al-Cl LDHs and AFt, respectively. The mechanochemical process reduces the reaction threshold between FA and CSW, enabling independent hydration reactions between them. Furthermore, wet milling improves the degree of dissolution of the aluminum phase in FA and OH- in CSW and promotes the Al embedding into the C-S-H gel structure. The early and late compressive strengths of HVFC were greatly improved, with 139 % and 60 % increases in 3 days and 56 days. This work provides feasible strategies to improve the mechanical property limitations of HVFC.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

20100 - Civil engineering

Projekt

<a href="/cs/project/EF17_048%2F0007373" target="_blank" >EF17_048/0007373: Predikce poškození konstrukčních materiálů</a><br>

Návaznosti

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

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

Journal of Building Engineering

ISSN

2352-7102

e-ISSN

2352-7102

Svazek periodika

98

Číslo periodika v rámci svazku

111402

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

18

Strana od-do

1-18

Kód UT WoS článku

001368015500001

EID výsledku v databázi Scopus

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