High temperature resistant fly-ash and metakaolin-based alkali-activated foams. Issue 17 (1st September 2021)

• Record Type: Journal Article
• Authors: Traven, Katja; Češnovar, Mark; Škapin, Srečo D.; Ducman, Vilma
• Is Part Of: Ceramics international. Volume 47:Issue 17(2021)
• Page Start: 25105
• Page End: 25120
• Publication Date: 2021-09-01
• Subjects: Alkali-activated foams -- Fly-ash -- Porosity -- Thermal stability -- Mechanical properties -- Microstructural analysis; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.05.241
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Alkali-activated foams (AAFs) present one of the most promising materials for use in the construction sector. Their main advantages lie in their utilization of waste material and their ability to form at temperatures well below 100 °C, while still competing in performance with foamed glass or ceramics. The present body of research has focused on improving the thermal stability of fly-ash foams by i) adding metakaolin, and ii) changing the activator from sodium-based to potassium-based components. It has been confirmed that a certain increase in thermal resistance is achieved through the addition of metakaolin while changing activators played a crucial role. While sodium-based AAFs without metakaolin start to shrink at approximately 600 °C, samples that have had metakaolin added start to shrink at approximately 700 °C. Samples without metakaolin that have used a potassium activator start to shrink at approximately 800 °C, whereas potassium-based samples with the addition of metakaolin start to shrink at approximately 900 °C.