Thermal behaviour of ladle slag mortars containing ferrochrome slag aggregates

Concretes, depending on their application, may be exposed to elevated temperatures during their lifetime, especially when placed near or in a furnace or during an accidental fire. The thermal stability of alkali-activated mortars and hydrated mortars prepared using ladle slag and two different aggre...

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Bibliographic Details
Published in:Advances in cement research 2021-04, Vol.33 (4), p.168-182
Main Authors: Adesanya, Elijah, Karhu, Marjaana, Ismailov, Arnold, Ohenoja, Katja, Kinnunen, Paivo, Illikainen, Mirja
Format: Article
Language:English
Subjects:
Aggregates
Aluminous cements
Calcium aluminate
Carbon dioxide
Dehydration
Dilatometry
Fire resistance
Fire resistant materials
Fireplaces
High temperature
Incompatibility
Ladles
Mortars (material)
Slag
Temperature dependence
Thermal stability
Thermodynamic properties
Thermogravimetric analysis
Ultrasonic testing
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Summary:Concretes, depending on their application, may be exposed to elevated temperatures during their lifetime, especially when placed near or in a furnace or during an accidental fire. The thermal stability of alkali-activated mortars and hydrated mortars prepared using ladle slag and two different aggregates was studied. A commercial calcium aluminate cement was used as a comparison for the properties after exposure to temperatures up to 1000°C. All samples were characterised and analysed through a strength test, dilatometric analysis, thermogravimetric analysis, ultrasonic pulse velocity and scanning electron microscopy. The hydrated ladle slag mortars exhibited properties similar to or better than the commercial calcium aluminate cement, while the alkali-activated ladle slag's thermal properties were inferior to the hydrated ladle slag mortars. The tests also showed that the use of ferrochrome slag aggregates in hydrated ladle slag mortars exhibited similar properties to those using sand aggregate mortars. The damage behaviours of the mortars were dependent on the temperature-induced dehydration, dehydroxylation and thermal incompatibility between the paste and aggregates. The results from this study specify the possibilities of using 100% industrial by-product-based mortar and near-zero carbon dioxide emissions as a fire-resistant material in furnaces, buildings and fireplaces.
ISSN:0951-7197
1751-7605
DOI:10.1680/jadcr.19.00040