Improved sprayable portland cement-based fireproofing...

C - Chemistry – Metallurgy – 09 – K

Patent

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Details

C09K 21/00 (2006.01) B05D 1/14 (2006.01) C04B 22/14 (2006.01) C04B 28/04 (2006.01) C04B 28/14 (2006.01) C09K 21/02 (2006.01)

Patent

CA 2094112

Sprayable fireproofing compositions for structural members such as steel columns are provided, as well as a method of applying multiple coatings thereof. The compositions comprise a Portland cement-based material, stucco, and an accelerator. The compositions eliminate the long setting times typical of Portland cement-based materials, and improve the hangability thereof. The product is produced by dry blending a mixture of Portland cement, stucco (calcium sulfate hemi-hydrate) and optionally, a stucco set retarder and shredded polystyrene aggregate. Upon the addition of water, sprayable slurries are formed which can be pumped to the point of application. An accelerator is added in close proximity to the point of injection. Other additives may also be included, such as starch, adhesives and cement strength enhancers. The slurries adhere to the structural member in the slurried state and after setting to provide excellent fire and heat protection. Because of the relative quick setting time of the slurry upon spray application, multiple coatings can be applied within the same working day.

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