Heat-resistant composites based on ternary binders with a low cement content: Characterization and performance

• Published in: Developments in the built environment Vol. 18; p. 100400
• Main Authors: Koňáková, Dana, Pommer, Vojtěch, Šádková, Kateřina, Záleská, Martina, Böhm, Martin, Keppert, Martin, Vejmelková, Eva
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.04.2024; Elsevier
• Subjects: Calcium aluminate cement; Heat-resistant composite; Material characterization; Mechanical properties; Supplementary cementitious materials; Ternary binder; Thermal expansion; Material characterization; Thermal expansion; Supplementary cementitious materials; Calcium aluminate cement; Mechanical properties; Heat-resistant composite; Ternary binder
• ISSN: 2666-1659; 2666-1659
• DOI: 10.1016/j.dibe.2024.100400

A reduction in cement consumption can be achieved through the use of supplementary cementitious materials (SCMs). In addition, the utilization of more than one SCM can show a beneficial synergic performance. In this paper, a combination of calcium aluminate cement, alumina admixtures and one other type of SCM was investigated. Namely: microsilica, ferrite powder, ceramic dust, calcined shale and sintered mullite were employed. The phase compositions of the designed binders were primarily characterized by XRD, XRF, DSC and SEM. Subsequently, the basic physical and mechanical properties as well as thermal expansion of the ternary binder-based composites up to 1400 °C were determined. The results revealed the synergic performance of used components. Calcined shale and ceramic powder were the most promising admixtures, exhibiting compressive strength of 80 MPa at room temperature and 117 and 128 MPa for ceramic powder and calcined shale, respectively, after exposure to 1400 °C. •Ternary binders composed of CAC, aluminates admixture, and one other SCMs.•Either microsilica, ferrite powder, ceramic dust, calcined shale or sintered mullite was used.•The phase compositions of the hardened binders were noticeably modified.•The designed binders showed synergic improvement of mechanical properties.•Ternary binders with calcined shale or ceramic powder were the most promising.