Rapid setting cementitious fireproofing compositions and method of spray applying same
AssigneeW. R. Grace & Co.-Conn.
InventorsDennis M. Hilton, Paul E. Korenberg, Suzanne M. Conroy
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Abstract
A method is provided whereby the setting time of a spray applied hydraulic cement-based fireproofing composition is decreased substantially while improving the yield of the composition. An acidic set accelerating agent is thus introduced into the composition effectively after conveyance through the system and in close proximity to the spray nozzle. At least about 0.5% of a basic material is provided which evolves a gas upon reaction with the accelerating agent. The invention also relates to the sprayable fireproofing compositions resulting from operation of the method.
Claims15
A method comprising the steps of:
- conveying to a spray nozzle a slurry of a hydraulic cement-based fireproofing composition consisting essentially of a hydraulic cement binder selected from the group consisting of Plaster of Paris, gypsum, Portland cement, aluminous cement, and possolanic cement, a set retarding agent and at least about 0.5% of a basic material;
- introducing an acidic set accelerating agent into said slurry in close proximity to said nozzle;
- and
- spraying said slurry onto a substrate;
- wherein (a) the setting of said slurry is accelerated and (b) said basic material and set accelerating agent react prior to the accelerated setting of said slurry to provide a yield increase therein and a density after the composition has set in the range of about 12 to 25 pounds per cubic foot.
Dependencies are inferred from the claim text.