Preparation and characterization of calcium aluminate by chemical synthesis

Feng Chen1), Yanruo Hong1), Jialin Sun1), and Jinglong Bu1,2) 1) Materials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China 2) Hebei Physical and Engineering Institute, Tangshan 063009, China

摘 要：<正>Saturated Ca（OH）₂ and AlCl₃ solutions were used to synthesize calcium aluminate hydrate precipitates at room temperature; high purity calcium aluminate powders with stable phases were made by calcination of the precursors at a temperature as low as 1100℃. PSD and BET analysis revealed the particles with sizes ranging from submicrometer to several micrometers and with a specific area of 13 nr/g. The measurement of hydraulic exotherm revealed that the exothermal rate is in peak for about 2 h. The exothermal quantities are 449.24 J/g at 12 h and 488.38 J/g at 24 h. Its strength development is quick and the 1 day curing strength is almost equal to 100％ of the 3 days curing strength in the mortar test.

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