Thermal behaviour of ladle slag mortars containing ferrochrome slag aggregates

Elijah Adesanya, Marjaana Karhu, Arnold Ismailov, Katja Ohenoja, Paivo Kinnunen, Mirja Illikainen

Research output: Contribution to journalArticleScientificpeer-review

14 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)168-182
Number of pages15
Issue number4
Publication statusPublished - 2021
Publication typeA1 Journal article-refereed


  • Alkali-activated cements
  • High-alumina cement
  • Thermal behaviour

Publication forum classification

  • Publication forum level 1

ASJC Scopus subject areas

  • Building and Construction
  • General Materials Science


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