refractory concrete[ri′frak·trē ′kän‚krēt]
concrete capable of retaining its physicomechanical properties within predetermined limits during prolonged exposure to high temperatures. Binders used in refractory concrete include portland cement; slag-portland cement; high-alumina, alumina, or periclase cement; water glass; and phosphate bonds. Finely divided additives are added to the binders in many cases. Crushed heat-resistant or refractory rocks, chips of fired heat-resistant products, and some other materials are used as fillers. According to the degree of fire resistance, refractory concrete is subdivided into highly refractory (fire resistance above 1770°C), refractory (1580°- 1770°C), and heat-resistant (below 1580°C) varieties. Refractory concrete is used in the construction of thermal units and the foundations of industrial furnaces and other structures subjected to prolonged heating.
REFERENCESNekrasov, K. D., and A. P. Tarasova. Zharostoikii be ton na portlandtsemente. Moscow, 1969.
Instruktsiia po tekhnologii prigotovleniia i primeneniiu zharostoikikh betonov: SN 156–67. Moscow, 1967.
K. D. NEKRASOV