Abstract: A process of producing an asphalt-impregnated fiberboard comprises the steps of forming an aqueous slurry of a fibrous material and asphalt, the solids content of the slurry being less than about 8 weight percent, mixing the slurry to uniformly distribute its components, dewatering the slurry to form a wet mat, pressing the wet mat to consolidate it, and drying the consolidated wet mat. Fiberboards made by the process can be employed as durable resilient expansion joints between various types of structural members.

Abstract: A method of forming an insulation product includes heating a thermoplastic material to a softened condition, and applying the thermoplastic material to a blanket of fibrous insulation material to form a laminated insulation material comprising a layer of the thermoplastic material bonded to the fibrous insulation material. The laminated insulation material is heated to soften it and molded to form it into a desired shape, and the molded laminated insulation material is cooled to form an insulation product.

Abstract: A method for casting friable asbestos-containing material into a non-friable mass includes the steps of: (1) mixing portland cement, molding plaster, plasticizer, water and friable asbestos-containing material in a mixer; (2) pouring the mixture into a plastic bag positioned in a form; (3) compressing the mixture within the form prior to the curing process; (4) embedding a lifting eye in the mixture; (5) allowing the mixture to cure to a hardened state; (6) removing the form from the hardened mass; and (7) sealing the upper end of the plastic bag to enclose the hardened mass.

Abstract: A method for long-term storage of radioactive waste in a solid bitumen is here taught. A granular ion-exchange resin (including radioactive ions) is mixed with a bitumen and water emulsion to produce a swollen aqueous product for encapsulation. The method is carried out at room temperature and optionally includes a cationic emulsion having a pH value of less than 4. The emulsion has a water content form 15-50% by weight and preferably is saturated with the water.

Abstract: This invention provides a method for the manufacture of a fibrous plate rich in water resistance, which comprises the steps of uniformly mixing and dispersing fibrous raw material and finely divided bituminous substance in water, molding the resultant aqueous dispersion in the shape of a plate, and heating the plate with a hot press thereby melting the bituminous substance contained in the fibrous material and converting the plate into a fibrous plate having the bituminous substance uniformly dispersed therein. The fibrous plate obtained by this method excels in water resistance, weatherability, and thermal insulation and passes the standard specification concerning joint plates for use in concrete structures.

Abstract: A method of overlaying sulphur concrete is adapted for use in placing sulphur concrete against or over an existing solid surface such as the exterior surface of a wall, floor, or column base. The existing surface, which typically is a portland cement concrete surface, is prepared by first applying a layer of a bituminous material containing a bitumen which liquifies at temperatures corresponding to the pour temperatures of the sulphur concrete. The sulphur concrete is poured against or over the bitumen-containing surface so that the bitumen therein melts to form a liquid slip plane. The shrinkage of the sulphur concrete which occurs during its temperature-reduction setting occurs without producing cracks because of the relative slippage permitted between the existing wall surface and the sulphur concrete.

Abstract: Radioactive waste concentrates encapsulated into non-deformable asphalt at the inlet of an extruder feeding hard asphalt granules and hydrocarbon oil for mixing therein and downstream of the initial mixing adding the radioactive waste concentrates for mixing with the initial mixture.