Effect of CAC content on the strength of castables at temperatures between 300 and 1000 °C. Issue 10 (July 2020)

• Record Type: Journal Article
• Authors: Gao, Song; Zhang, Peixiong; Li, Na; Zhang, Ju; Luan, Jian; Ye, Guotian; Liao, Guihua
• Is Part Of: Ceramics international. Volume 46:Issue 10(2020)Part A
• Page Start: 14957
• Page End: 14963
• Publication Date: 2020-07
• Subjects: Calcium aluminate cement -- Castables -- Hydrates -- Strength -- Phase -- Microstructure; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2020.03.024
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: This study investigates the strength progression of calcium aluminate cement (CAC)-bonded castables with a CAC content ranging from 2 to 16 wt% in the temperatures between 300 and 1000 °C. Focusing on the phase changes and microstructure evolution of the hydrates due to heating, we discovered that castables with higher CAC contents have increased strengths between 300 and 800 °C because the morphology and structure of the dehydrated C3 AH6 and AH3 remain similar. At 1000 °C, a higher strength of the 16 wt% CAC castable results from the higher degree of coalescence/sintering between the particles formed from the decomposition products of CAC hydrates. The CAC-bonded castables were prepared using tabular alumina aggregates and α-Al2 O3 micro-powder as starting materials, and CAC as the binder. The phase compositions and the microstructures of the castable matrices were characterised by X-ray powder diffraction and scanning electron microscopy, respectively.