Abstract: A reinforced concrete wall, such as a road barrier or barricade, has a monolithic surface ornamentation thereon constituted by pigmented cements and grooves simulating mortar joints. In the horizontally oriented top portions of the wall where the pigmented cements are substantially thicker than the layers of pigmented cements monolithically joined to the vertical oriented portions of the wall so that these portions, which are subject to chipping and the like during handling and use will retain their aesthetically pleasing appearance. In the molding process, ribs on the mold surface which will form the grooves have a retardant applied thereto so that the cement forming the mortar joint will set at a slower rate than the rest of the body of the concrete wall and when removed from the mold can be brushed. When the wall is in the form of a road barrier, the ends are provided with a conical projection and a conical recess, respectively, to provide coupling between adjacent wall units.

Abstract: A body having a large number of protrusions is aligned with a honeycomb surface having a greater number of openings, selected openings being engaged by the protrusions when the body is aligned, by positioning the body against the honeycomb surface and vibrating it until the protrusions engage. The method is of particular use in aligning flexible masks to end faces of honeycomb structures in the fabrication of solid particulate filter bodies. Particular mask and honeycomb structure geometries are suggested for automation of the process.

Abstract: A method of repairing windshields that have been chipped or cracked comprising the steps of removing damaged glass from a break in the surface of the glass, fixing a pressure applier over the break, impact vibrating the windshield and heating the reverse side of the windshield to increase the size of the opening being filled and to drive air from the opening, injecting a resin into the damaged area while vibrating and heating and, if necessary, removing any additional air by developing a suction over the damaged area. The apparatus of the invention includes a frame that is suction held in place, and that mounts the injection plunger and a vibrator to vibrate the glass as a resin is injected into openings in the glass.

Abstract: Several advantages as to ease of cell fabrication, maximum cell size, fiber breakage, tubesheet tightness, resistance to tubesheet deformation in prolonged service, safety, etc., can be realized by using as the tubesheet in a hollow fiber type battery cell one which is elongated in shape, has a substantially smaller diameter than the fiber "bundle" depending from it and in which the fiber ends passing through it are closely packed.

Abstract: The invention relates to a ceramic molding which is manufactured from high-temperature resistant, fire-resistant or refractory fibers and fine-grain, fire-resistant or refractory materials and, in certain cases, from other customary additives. The ceramic molding is characterized by the fact that its porosity gradually and continuously increases along an axis of the molding from less than 20% to more than 70%. The areas with low porosity comprise the fine-grain, fire-resistant or refractory materials. The areas of high porosity comprise ceramic fiber, such as, fibers of Al.sub.2 O.sub.3, SiO.sub.2, ZrO.sub.2, C, SiC or mixtures thereof. The intermediate areas are constructed of mixtures of ceramic fiber and fire-resistant or refractory materials. The invention also relates to the use of such a ceramic molding method for the manufacture of compound moldings saturated or infiltrated with organic resins, pitch, tar, metals, metal alloys or glasses.

Abstract: In a process wherein parts are pressed into a predetermined shape by filling a die cavity with a powder material, compressing the powder under pressure to form a compressed part of said shape, an improvement to that process comprises subjecting a portion of the cavity to vibrations during the filling of the die cavity.

Abstract: Extrusion of a mixture of vegetable bits with a binder, particularly wood chips with a weather-resistant binder, involves precompressing in a compression chamber of an extrusion press the mixture by a compression stroke transverse to the extrusion axis, the compression stroke being delivered by at least one precompression piston. Prior to the precompression elongated bits of the mixture are acted on by an orienting influence so that the elongated bits are deposited substantially parallel to the extrusion axis. The outer layers of the mixture are compressed with a reduced precompression ratio so that the bits oriented prior to precompression remain fixed in position during the subsequent extrusion stroke.

Abstract: Apparatus for making injection molded polymeric articles, comprising a vibratory pneumatic cooling assembly adapted to dissipate thermal energy from the polymeric articles after they are ejected from the mold cavities through use of an oscillating perforated vibratory grid adapted to maintain the articles in relative motion while at least partially supporting them on a substantially uniform cushion of air. A method for employing the apparatus of the invention to substantially reduce the cycle time required for injection molding polymeric articles is also provided.

Abstract: In an arrangement for and a method of producing shaped parts of a non-swellable mixture of fibers and heat-hardenable resin, a pressing mass divider is introduced into lower pressing tool during filling of the mixture.

Abstract: The present invention relates to conformable tile products which may be formed from aggregate material and relatively low weight percentages of unsaturated polyester resin precursors. When cured, the tiles may be adhered to subfloors utilizing ordinary resilient flooring-type adhesives. Further, they will be conformable to subsurface irregularities, and will have high strength and impact resistance when installed as a flooring surface.

Abstract: A method and apparatus for curing concrete cement by packing the concrete with aid of a vibrator having a variable vibration speed. The vibration speed is selected according to the viscosity of the cement, as is the time period. The disclosed method and apparatus causes the cement to be uniformly settled and distributed throughout the objective space field.

Abstract: This invention is directed to means for expediting the fabrication of selectively-manifolded honeycomb structures for use as fluid filter elements. The method comprises the use of flexible masks which are properly aligned to the end faces of a honeycomb structure utilizing vibratory motion in conjunction with a locating wire. By varying the configuration of the masks, it is possible to fabricate a fluid filter element having a center zone which is selectively manifolded and an outer portion wherein at least the ends of the honeycomb structure cells are completely filled.

Abstract: A method and apparatus for leveling a batch of pulverulent constituents in making a vitreous cellular material. A screen structure having at least one substantially flat screen layer is impressed down into and through at least a portion of the batch of pulverulent constituents. The screen structure is vibrated horizontally in a circular orbital motion while impressing the screen structure down into and through at least a portion of the batch of pulverulent constituents.

Abstract: A method of making imprints on the walls of portions of a tube obtained by the continuous molding of a ceramics-based paste and the cutting up of the tube, wherein immediately after the tube portions have been molded and are still deformable, they are placed on means parallel with the axis of the tube portions for rotating them around their axes of revolution, means are applied to the rotary means for exerting a pressure on at least a portion of the tubes so that such portions are clamped between the rotary means and the pressure-exerting means, the pressure-exerting means or the rotary means are provided with at least one imprint-making tool, the or each tool having a main direction which does not coincide with the direction of the axes of revolution of the tube portions, and means are applied to create a second relative movement between the tube portion and the or each tool, so that there is substantially no sliding between the tube portion and the or each tool.

Abstract: A method of making a cast concrete panel with coarse aggregate exposed on its upper face as cast comprising the steps of pouring and compacting wet concrete having a coarse aggregate content into a casting bed, leveling the upper surface of the concrete to the desired height by means that includes the passage thereover of a screed roller rotating in a direction to push excess surface concrete in advance of the screed roller, lifting coarse aggregate towards the upper surface of the concrete in advance of the screed roller by passing the free ends of rotating aggregate lifter arms through the concrete, the aggregate lifter-arms being spaced apart a distance to support coarse aggregate therebetween, whereby to lift and concentrate coarse aggregate in the wet concrete towards the surface, and to deposit a high concentration of coarse aggregate in front of said screed roller, said aggregate lifter arms being mounted radially of a rotating shaft that rotates in the opposite direction to the direction of rotation o

Abstract: The invention is a shaped article of boron nitride having a density of at least 95% of the theoretical density which consists of polycrystalline hexagonal boron nitride in the form of a homogeneous isotropic microstructure and which has been manufactured from pure boron nitride powder without the concomitant use of sintering aids by isostatic hot-pressing in a vacuum-tight casing at temperatures of from about 1200.degree. to 1500.degree. C. under a pressure of from about 50 to 300 MPa. Boron nitride powders having a free boric oxide content of not more than 1.0% by weight and having a specific surface area of from 5 to 30 m.sup.2 /g are used as starting material. The powders either are filled into prefabricated casings consisting of steel or glass and densified by vibration or are preshaped to form green bodies having pores open to the surface and then placed in prefabricated casings or coated with a material which forms a vacuum-tight casing.

Abstract: A method of making a magnetic core for a coil so that the coil obtains a desired final inductance value. The core is introduced into the coil by partly filling the inner volume of a coil former with a soft magnetic powdery material which is subsequently maintained in the correct position by the deposition of a tough liquid material on the powdery material surface, said tough liquid material forming a cover plate after curing.

Abstract: A method for manufacturing porous shaped articles, such as flat or channel shaped insulation plates, blocks and similar building elements, in particular for building completely insulated houses, the articles obtained by this method and building constructions erected from these articles, in which method spheres of expanded porous resinous foamed material are blended with a binder, comprising a mixture of a bituminous product, and waterglass with a waterglass content of at the most 75% by weight, while at the end of this blending operation a quantity of particulate or powdery material including an additive such as sand is added to and co-blended with said blend until the mass again consists mainly of loose spheres, whereupon cement is added to the blend and the entire mixture is subjected again to a second mixing operation, while metering a quantity of water, and the mixture thus finally obtained is formed into the desired articles by compression and vibration followed by drying said articles in a self-supporti

Abstract: An apparatus for automatically advancing a concrete screed as the screed tamps and levels concrete. The apparatus includes cable reeling means attached to either end of the concrete screed for winding a drive cable. The drive cable is adapted for attachment to a fixed location downstream from the screed so that winding of the cable on the reeling means propels the concrete screed towards the fixed location. The cable reeling means is driven by a power transfer means including a driven pulley and a slave pulley with an endless belt loosely mounted around the pulleys so that when the driven pulley is rotated, the belt will normally not drive the slave pulley. The apparatus also includes an assembly positioned to tension the belt between the drive and slave pulleys to cause the driven pulley to drive the slave pulley through the belt, and therefore drive the cable reeling means, propelling the concrete screed across the concrete.

Abstract: A method of filling a sleeve 4 of cable stay anchorage with a filling material comprising aggregate particles and a curable liquid mixture of an epoxy resin and a powder, comprising the steps of first filling the sleeve 4 with the curable liquid mixture (via pipe 10), secondly adding the aggregate particles (via pipe 11) and then allowing the liquid mixture to cure to form a solid mass containing the aggregate particles. The method of filling the anchorage is considerably easier than prior art methods, does not require the use of injection pumps and provides a filling material with low shrinkage and good corrosion and friction preventing properties. The anchorage also has plastics locating members 7, 8 to hold the wires 1 out of contact with the sleeve wall, to prevent friction under cyclic loads.

Abstract: Composites, comprising organic polymeric fibers and solid particles, are described which exhibit a wide range of functional characteristics. The materials are light in weight, structurally strong and are air permeable. The fabrication of protective clothing for use in chemical warfare environments is a typical use for which these composites are suitable.

Abstract: A concrete plate assembly, e.g. as load carrying members or for building facades, comprises an inner concrete slab, an outer concrete slab spaced from the inner slab, and at least one main or stress-absorbing anchor embedded and interconnecting the slabs which are reinforced. The intervening space can be filled with an insulation and/or can constitute an insulating air space. According to the invention, at least one of the concrete slabs in the region of the connecting anchor, is provided with a closed reinforcing ring which lies in the plane of the slab, preferably midway of the cross section thereof, the anchor being embedded in the concrete within the reinforcing ring and preferably centrally thereof.

Abstract: A method is provided for making a cement composite product such as a flat or profiled sheet, or a pipe, containing glass fibre as reinforcement instead of the traditional asbestos, wherein a cement and water slurry of flowable consistency is made with high shear agitation, the glass fibre is mixed with the slurry in a static mixing apparatus (i.e. having no moving parts) by bringing together flows of the slurry and of the glass fibre and then altering the path of the conjoined flow, and the glass fibre-containing mixture is immediately subjected to the conventional deposition on a water-permeable web, formation of a profile if desired, drainage of the water from the slurry through the web, and curing the deposited cement to form the product.

Abstract: Bubble- or void-free electrical laminates such as unclad or metal clad laminates are produced by impregnating a porous fibrous substrate with a solvent-free liquid resin capable of curing to a rigid state without producing a volatile by-product, combining a plurality of impregnated substrates to form a unitary member, allowing substantially all of entrapped air bubbles retained in the combination to disappear by dissolving into the liquid resin, and then curing the combination.

Abstract: A method and apparatus for the production of a composite sheet material and a material produced thereby are described, a typical product being a lightweight permanent or temporary formwork sheet of accurate thickness and parallelism made from material including glass fiber reinforced cement. A base or mould is moved through successive stations at which uncured but curable material is deposited in layers thereon. At least the final layer is consolidated by a local surface treatment with a vibratory screeder, the influence of which spreads through the material to promote intimate bonding together of the uncured layers. In a preferred form, the material comprises three layers, the first and third being of glass fiber reinforced cement and the central second layer being of cementitious material including a lightweight aggregate such as hollow microspheres.

Abstract: A process for making a porous sintered body of calcium phosphate having continuous and fine pores distributed uniformly throughout the porous body is provided which comprises the steps of: preparing a slurry of amorphous calcium phosphate having a molar ratio of calcium to phosphor ranging within 1.59 to 1.80; adding a foaming agent to said slurry; dipping a porous body of an organic material having continuous and fine void channels into said slurry prior to or after foaming said slurry to allow said slurry to adhere on the internal walls of said void channels; heating said porous body of said organic material at a temperature high enough for decomposing said organic material to varnish into smoke and concurrently for thermally converting said amorphous calcium phosphate into hydroxyapatite to form a network of hydroxyapatite; and sintering said network of hydroxyapatite to form said porous sintered body.

Abstract: A synthetic onyx material and method of preparation having veined coloring marks, within a matrix, in a smoothly flowing, variegated pattern resembling the flow of colored contaminants in natural onyx; the patterns are in juxtaposed portions revealing an optical boundary.

Abstract: A light-weight, portable and sturdy vibratory concrete screed which may be fabricated in modular fashion from a plurality of interconnected, separable frame units. A framework is provided, having a series of spaced, parallel unitary frame members of triangular configuration, the corners of the base of each frame member being attached to a pair of screed plates and maintaining the screed plates in spaced-apart relationship. Side braces and base braces extend between adjacent frame members for framework rigidity. An eccentric shaft is supported for rotation in bearings mounted in the frame members. The shaft may be symmetrically located in order to impart uniform vibrations to the two screed plates, or may be offset in order to self-propel the concrete screed.

Abstract: The present invention is concerned with regulation of evolutive pulp. It offers a regulation process and mechanism, said mechanism including an elastic shape-changing pneumatic valve, valve opening control means, and modulating means causing a variation of said valve opening either way from an opening setting achieved through control means. The present invention can be applied to a continuous process for mixing plaster.

Abstract: An electrical component which includes a circuit element such as a solid electrolytic capacitor arranged within a metallic casing or can. One electrical lead of the component is connected to the casing; the other lead is connected to the circuit element and extends through an opening in the casing. This opening is filled with a first plastic material to seal the circuit element within the casing against environmental conditions. A conformable coating of a second plastic material is disposed over the outer surface of the casing and extends over the edges of the casing into the opening so as to join with the first plastic material disposed in the opening.

Abstract: This invention provides a process of producing a building product, particularly a gypsum slab having preferably a density of below 800 kg/m.sup.3, with gypsum and mixing water. The quantity of mixing water required for rehydration and molding is at least substantially completely introduced into the gypsum by means of water saturated porous particles added in a distributed form. The process comprises the steps of intimately mixing water saturated particles with pulverous gypsum to form a fluid mixture; converting said fluid mixture at least almost completely without the application of pressure to the shape of a gypsum building product; permitting mixing water of the water saturated particles to be absorbed by the pulverous gypsum, and permitting the resulting mixture to set and harden.

Abstract: Method for making a refractory valve is disclosed. The sliding gate valve slide plate in a can has an integral collector nozzle and is formed as two conjoined refractory concrete mouldings with a cup or trough shaped metal foil lying in the joint therebetween. The foil is oxidisable in service to form a bond between the concretes. The concretes may be of different formulations, and the moulding with which molten metal makes contact is preferably the more resistant to the rigorous environment presented by flowing molten metal.The slide plate is cast in two steps using the shaped foil and the can as respective lost mould members which coact with a planar polished surface to produce a cast slide plate needing effectively no finish grinding before installation in a valve.

Abstract: The invention relates to a process for the production of molded elements of mineralic components and hardenable organic binders, which are mixed, filled into suitable molds and, by applying heat are hardened, wherein the heat to be supplied to the mass to be hardened is provided by a dielectric heater.The invention relates also to the apparatus for performing the process wherein two electrode plates arranged at a variable distance relative to each other, a dielectric heater and a mold provided therebetween to receive the mass to be hardened of said molded element is provided.

Abstract: Hollow plastic microspheres made from thermoplastic or thermosetting plastic compositions are described.The hollow plastic microspheres are made by forming a liquid film of thermoplastic or thermosetting plastic composition across a coaxial blowing nozzle, applying a blowing gas at a positive pressure to the inner surface of the plastic film to blow the film and form an elongated cylinder shaped liquid film of plastic. A transverse jet is used to direct an entraining fluid over and around the blowing nozzle at an angle to the axis of the blowing nozzle. The entraining fluid as it passes over and around the blowing nozzle fluid dynamically induces a pulsating or fluctuating pressure field at the opposite or lee side of the blowing nozzle in the wake or shadow of the coaxial blowing nozzle.

Abstract: A continuous method and apparatus are disclosed for forming and electrostatically orienting a mat of discrete particles of lignocellulosic material on an electrically nonconductive transfer surface and then transferring the directionally oriented mat onto a grounded, moving, electrically conductive mat receiving surface under the continuing influence of an electrostatic field without loss of orientation of the particles of lignocellulosic material making up the mat.

Abstract: A method for forming a concrete floor as a monolithic unit is disclosed wherein wet concrete mix is deposited and screeded to achieve a generally uniform thickness of concrete with the aggregate being densified or settled to produce a thin upper layer formed substantially from sand and cement, thereafter floating the concrete to substantially remove surface irregularities, and then grinding the upper surface of the concrete floor after it is hardened to produce a flat surface having a "sanded" finish.

Abstract: A process and apparatus for making a plurality of building modules each having a foam core encased in a shell of fiber reinforced cement. A bottom layer is cast and fiber reinforced in a casting zone having side rails along a base and division members corresponding to the lengths of the modules being formed. End members are placed on top of the division members and foam cores are placed on the bottom layer between end members leaving free space between the core member, the side rails and the end members. Wet cement is applied to fill the free space surrounding each core member and to form a top layer which covers each core member thereby separately encasing each core member. Fiber reinforcement is applied to the top layer and a plurality of cured modules are removed from the casting zone.

Abstract: Electrical power, instrument and communication cables constructed with combustible coverings can provide a pathway by which fire might spread. Cable fires within a room or compartment can be arrested by the construction of a properly designed "fire break" placed periodically along a cable run; and cable fire spread between rooms can be arrested by a properly placed "fire stop". Cable runs generally include a cable tray or raceway to contain the cables. An effective fire barrier, e.g., "fire break" or "fire stop" may be constructed in such a cable tray or raceway by filling a portion of the tray or raceway with a gypsum composition comprising gypsum plaster, an inert filler mixture of diatomaceous earth and lightweight expanded aggregate, and very small amounts of glycerin, boric acid and a corrosion inhibitor such as a boron nitride, boron nitrile or mixture of such boron compounds.

Abstract: Concrete building panels include a decorative embossed pattern on an outer surface. A plurality of concrete reinforcing ribs are disposed along an inner surface of the concrete building panels. Nailing strips are anchored into tips of the respective concrete reinforcing ribs. A method for making the building panels include a step of placing anchored nailing strips into tapered rib sections of a horizontal fiberglass mold is disclosed wherein reinforcing bars and mesh and moist concrete are placed into the mold and allowed to cure until the exposed upper surface of the moist concrete is plastically deformable. The horizontal mold is passed beneath a rotating embossing roller having a cylindrical embossing pattern thereon. The plastically deformable concrete contacts the embossing pattern, producing a complementary pattern on the concrete surface. The embossed concrete is cured in the mold to produce the building panel. The concrete building panel is then separated from the mold.

Abstract: A process for simultaneously batch-coating a number of electric components having radial connections wires extending in approximately parallel relation from the element to be covered utilizes a plate having a hole pattern therein for receiving the wires to retain the elements during coating. A synthetic foil is first placed over the plate and the wires are forced through the foil into the holes. A grid having openings therein formed by perpendicular walls for surrounding the elements is placed over the plate for use as a casting mold. A casting resin is deposited over the grid in excess quantity, and is then smoothed by moving a doctor over the grid. After the resin has hardened, the grid is removed and the individual elements, with the resin adhering to the synthetic foil, are separated.

Abstract: An improved method for the fabrication of a reinforced composite. The method includes assembling rigid rods into a geometric structure such that all interstitial voids are interconnected, infiltrating the geometric structure with particles, impregnating the infiltrated geometric structure with an appropriate liquid matrix binder or precursor, and treating the impregnated geometric structure such that the binder solidifies to form the reinforced composite.

Abstract: A method of encapsulating electrical apparatus in a particulate filler material which is cohesively bonded together by a binder material which forms beads around the points of contact between contiguous particles. The filler material includes uncoated and dry, resin-coated particles, with the dry resin being redistributed after the particles of filler are in position about the electrical apparatus by the step of liquifying the resin coating with a liquid solvent, to form beads around the points of contact between contiguous particles.

Abstract: A pourable substance is introduced into a container having a perforated bottom which defines, together with a mold, a forming space which is to be filled with the pourable substance. The forming space has a configuration substantially corresponding to that of the preform to be made, and the pourable substance passes through the perforations of the bottom of the container and is distributed throughout the forming space, owing to vibrations to which the perforated bottom of the container, either alone or together with the container, is subjected. The pourable substance is compacted within the forming space due to the vibration of the perforated bottom so that the preform can be subsequently taken out of the mold and compressed elsewhere into a profiled article, or the profiled article can be produced from the preform directly in the mold.

Abstract: A machine for molding pipe type elements such as steel fabric reinforced concrete pipes, provided with a funnel having protrusions on its inner surface mounted rotatably in relation to an external mold on rolling elements, a core tube being provided with preferably three guiding members arranged inside the core tube, at least one of the guiding members being filled with lubricating liquid and a seat at the lower ends of the guiding members fitted separably with a lubricating gasket, the seat consisting of at least two parts arranged symmetrically about a cylinder whereby the inner opening of the seat is fitted slidably to the outer diameter of the cylinder with the guiding members guided slidably in the openings of a guide forming the tip of the cylinder.

Abstract: In the formation of cylindrically shaped heat regenerators from ceramic honeycomb structures for use in gas turbine engines, a gas-impervious seal of the peripheral honeycomb cells and a high strength outer ring are formed simultaneously in an apparatus which provides for surrounding the outer wall of the honeycomb structure with a castable ceramic composition suitable for forming the outer ring, contacting a peripheral area of the upper surface of the honeycomb structure defining a predetermined number of peripheral cell openings with a (different) ceramic slurry composition, evacuating the honeycomb cells whose openings are contacted with the slurry composition through corresponding openings in the lower surface of the honeycomb structure in order to promote flow of the slurry into the evacuated cells, thereby forming a gas impervious seal of these peripheral cells, while simultaneously vibrating the honeycomb structure and castable composition in order to promote flow and intimate contact of the castable c

Abstract: We have prepared a new class of polymeric fibers and masses which are produced by precipitation from solutions of the polymer. The fibers and fiber masses have novel and useful characteristics. A fiber mass of this invention is a coherent, three-dimensional network of interconnected crystalline polymeric fibers and fiber bundles randomly arrayed in all directions. The fibers are smaller in diameter than can be consistently produced by conventional fiber drawing and spinning techniques.The novel fiber masses are produced from solutions of fiber-forming linear organic polymers having regularly repeated chain structures. The polymers are precipitated from these solutions by simultaneously cooling and agitating the polymer solution at vibrations in the sonic frequency range. The fiber masses may then be removed from the solvent or, in the case of a polymerizable solvent, a composite may be formed.

Abstract: A method of producing an electrically conductive plastic material, the conductive pigment in said material being selected from lamp black, graphite and a mixture of lamp black and graphite wherein the conductive pigment is dispersed in a hydrocarbon solvent, the pigment-hydrocarbon dispersion then being subjected to a vibrational force to cause swelling of the conductive pigment in the solvent and adding a bonding agent having an interface surface tension substantially equal to that of the solvent.

Abstract: A textile product formed of at least one thermoplastic yarn is texturized by subjecting the yarn simultaneously to a mechanical traction force and a high frequency electrical field applied at local points on the yarn. In order to increase the efficiency of texturizing, the yarn is moistened before it is subjected to the electrical field.

Abstract: A process for preparing olefin polymer fibrils is disclosed. A high molecular weight ethylene polymer is dissolved in methylene chloride in a first zone that is heated to develop a superatmospheric pressure. The polymer solution is fed to a second zone which is maintained at atmospheric pressure. The polymer solution is discharged into vigorously stirred isopropanol to form fibrils. Polymer solvent is distilled from the resulting slurry. The fibrils are refined in the isopropanol slurry. The polymer solvent and the isopropanol are recycled to the process.

Abstract: Reinforced panel structures include a panel core formed from a cementitious composition that has controlled bleed characteristics. For example, the cementitious composition may comprise hydraulic cement, a dispersing agent, a gelling agent, and water. At least one woven, fabric reinforcing layer in the form of a sheet is laminated in the panel core closely adjacent at least one of its faces. The controlled bleed characteristic of the core composition insures that the reinforcing layer is bonded tightly thereto. The fabric from which the layer is made has a tensile strain that is compatible with the compression strain of the panel core to permit the panel to be cold formed.