Microstructure and mechanical properties of activated high-alumina ferronickel slag with carbide slag and alkaline salts

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27690%2F22%3A10250449" target="_blank" >RIV/61989100:27690/22:10250449 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S2352710222000596" target="_blank" >https://www.sciencedirect.com/science/article/pii/S2352710222000596</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jobe.2022.104046" target="_blank" >10.1016/j.jobe.2022.104046</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Microstructure and mechanical properties of activated high-alumina ferronickel slag with carbide slag and alkaline salts

Popis výsledku v původním jazyce

Alkali-activated materials have several remarkable advantages over Portland cement particularly in carbon emission and energy consumption. However, less work has focus on the feasibility of preparing geopolymers from high-alumina ferronickel slag (AFS) with alkaline salts as activators. This article reports the microstructure and mechanical properties of activated high-alumina ferronickel slag (AAFS) with a combination of carbide slag (CS) and Na2CO3 (SC) or Na2SO4 (SS). Results indicate that the AAFS pastes properties are affected by concentration (Na2O equivalent) and nature of activator. The hydration of high-alumina ferronickel slag (FNS) is accelerated as the Na2O equivalent increases from 0.5% to 3% regardless of alkaline salt type, while the early age hydration will be restricted when Na2O equivalent is higher than 3%. The pH of pore solution in SS-activated series is lower than that of SC-activated series. As such, SC-activated FNS pastes have higher exothermic heat in the initial hydration period than SS dosed specimens. Although SC activated pastes have more gel products and smaller critical pore diameter, the SS-activated specimens can achieve higher compressive strength due to compact interfacial transition zone and reasonable hydration products composition.

Název v anglickém jazyce

Microstructure and mechanical properties of activated high-alumina ferronickel slag with carbide slag and alkaline salts

Popis výsledku anglicky

Alkali-activated materials have several remarkable advantages over Portland cement particularly in carbon emission and energy consumption. However, less work has focus on the feasibility of preparing geopolymers from high-alumina ferronickel slag (AFS) with alkaline salts as activators. This article reports the microstructure and mechanical properties of activated high-alumina ferronickel slag (AAFS) with a combination of carbide slag (CS) and Na2CO3 (SC) or Na2SO4 (SS). Results indicate that the AAFS pastes properties are affected by concentration (Na2O equivalent) and nature of activator. The hydration of high-alumina ferronickel slag (FNS) is accelerated as the Na2O equivalent increases from 0.5% to 3% regardless of alkaline salt type, while the early age hydration will be restricted when Na2O equivalent is higher than 3%. The pH of pore solution in SS-activated series is lower than that of SC-activated series. As such, SC-activated FNS pastes have higher exothermic heat in the initial hydration period than SS dosed specimens. Although SC activated pastes have more gel products and smaller critical pore diameter, the SS-activated specimens can achieve higher compressive strength due to compact interfacial transition zone and reasonable hydration products composition.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

20100 - Civil engineering

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

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

—

Svazek periodika

49

Číslo periodika v rámci svazku

49

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

12

Strana od-do

nestrankovano

Kód UT WoS článku

000776443700002

EID výsledku v databázi Scopus

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