Low density insulating compositions containing combusted bark particles
AssigneeW. R. Grace & Co.
InventorsRobert W. Sterrett, Larry S. Shu, Robert J. Ostertog
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Abstract
Low density cementitious compositions are disclosed which are essentially the hydrated products from mixtures of inorganic hydratable binders such as gypsum and Portland cement with a novel lightweight aggregate material comprised of partially combusted bark particles obtained from bark-burning boiler furnaces of pulp processing concerns. Preferred compositions additionally incorporate conventional additives such as surfactants, fibrous materials, foam stabilizers and conventional lightweight aggregate such as expanded vermiculite to give products useful as lightweight thermal insulation concretes and fireproofings.
Claims23
A hydratable composition which when mixed with water and allowed to hydrate hardens to a low density mass comprising a hydratable inorganic binder in admixture with from about 1 to about 50 percent by weight based on said composition of a lightweight aggregate comprised of combusted bark particles obtained by partially combusting essentially the bark, in particulate form, removed from logs in a furnace.
A hydratable composition which when mixed with water and allowed to hydrate hardens into a mass having a density of less than about 45 pounds per cubic foot, comprising a hydratable inorganic binder in admixture with a lightweight aggregate comprised of combusted bark particles recovered from the flue gases produced in a boiler furnace during the partial combustion of essentially bark removed from logs, the bark being combusted while in the form of particles of less than about 1 to 2 inches in size.
A hydratable composition which when mixed with water and allowed to hydrate hardens to a low density mass comprising a hydratable inorganic binder in admixture with from about 1 to about 50 percent by weight based on said composition of a lightweight comprised of combusted bark particles obtained by partially combusting essentially the bark, in particulate form, removed from logs in a furnace, from about 0.1 to about 2 percent by weight of said composition of a surface active agent, from about 0.1 to about 1.5 percent by weight of said composition of a stabilizing component selected from the group consisting of cellulose ethers, starches, gums and admixtures thereof, and from about 0.1 to about 15 percent by weight of said composition of reinforcing fibers.
Dependencies are inferred from the claim text.