CONCRETE FIRE LOGS AND REFRACTORY MATERIALS

摘要

A refractory composition is formed by preparing a set retarded fresh cementitious composition formed from a class C fly ash, a set retardant such as boric acid, and an alkali activator such as an alkali metal citrate salt, and contacting the set-retarded fresh cementitious composition with a pH regulator, such as an alkali metal hydroxide or alkali metal carbonate. The set retarded mixture provides workability and avoids equipment fouling caused by premature setting, while the alkali activator provides rapid setting when desired. The cementitious composition is shaped into a brick, panel, slab, concrete fire log, or the like and allowed to harden. The hardened cementitious composition can be heated to form a dried cementitious composition, and further heated to produce a high strength refractory composition. Fibers and/or aggregates may be included.

主权项

1. A method of manufacturing a refractory composition, comprising:
preparing a fresh cementitious composition including Class C fly ash, an alkali activator, and water; shaping the fresh cementitious composition; allowing the shaped cementitious composition to harden; initially heating the hardened cementitious composition to remove water and form an at least partially dried cementitious composition of increased strength; and further heating the partially dried cementitious composition at a higher temperature to at least partially remove any additional water and form the refractory composition.