Showing papers on "Screed published in 1984"

Asphalt surface renewal method and apparatus

Abstract: A method and apparatus for renewing the surface of asphaltic paving at low cost and for immediate reuse. The asphalt surface is heated to about 300°-500° F. The surface is broken to a depth of about two inches and the lower material thoroughly mixed in situ with the broken surface material. After mixing, the material is further heated to fuse the heated mixture into a homogeneous surface. The surface is screeded for leveling and compacted by a road roller. A road machine is disclosed having a steam manifold for heating the asphalt, transversely reciprocating breaker bars having teeth adjusted to the depth desired, toothed mixing cylinders for mixing the broken material, and a second steam manifold for reheating the mixed material. Reciprocating screed bars on the road machine level the mixed and heated material. Final compacting may be done with a conventional road roller.

Placement of Asphalt Concrete Mixtures

Abstract: A brief description of the history of the development of the asphalt paver is given in this paper. It discusses the principle of the floating screed and the operation of the paver tractor unit and screed unit. The forces that act on the screed and keep it in balance (level) to provide a smooth asphalt concrete mat are explained. Improvements in paver design and operation are detailed, and the most recent innovation of the self-widening screed is described. It is pointed out, however, that the basic operational functions of a modern paver are still the same as developed over 50 years ago. The paper also describes the causes of and cures for twelve different common problems that can occur in the asphalt concrete mat behind the paver. Emphasis is placed on why the various deficiencies have occurred and on what can be done to correct the problem when it does happen. Finally, for each mat problem area, the paper discusses the affect of each defect on the long-term performance of the asphalt concrete pavement structure. (Author)

Concrete screed with curb forming apparatus

Abstract: The present invention simultaneously finishes the surface of an area of plastic concrete and forms a curb along one or both sides of the area as the apparatus is translated along the length of the area. The apparatus includes a vibratory concrete finishing machine such as a triangular truss concrete screed having first and second sides and spaced apart front and rear screed blades. The two sides of the finishing machine are supported by roller support units which engage each of the spaced apart forms. Coupling means connects the first roller support unit to the first side of the finishing machine, adjusts the lateral spacing between the first side of the finishing machine and the form, and adjusts the elevation of the screed blades with respect to the form. A curb form is coupled to the finishing machine between the form and the first side of the finishing machine.

Sound insulating marginal strip for floor structures, and method of manufacturing it.

Abstract: In the strip for floor structures comprising bare floor, footstep sound insulating layer and screed, it is proposed to fashion a holding flange (6) from a foamed plastic strip, eg under the action of pressure and heat, in which process a step (7) is formed This step (7) can however also be formed by mechanical means, eg by cutting off and/or cutting in It is also possible to produce the profile for the sound insulating marginal strip (1), even during extrusion with the aid of an extruder and suitable tools, from a thermoplastic to which a foaming agent is added The sound insulating marginal strip (1) in the angled-off state fits snugly against the associated wall or masonry and, when mounted, is securely held by the holding flange (6)

Vibratory concrete screed

Abstract: A device for screeding and finishing concrete pavements having an elongate sectional framework, turnbuckles between framework sections to provide a crown or sag, a rotating shaft with eccentric weights driven by an internal combustion engine to impart vibration, hydraulic pumps and motors driving winches for self-propulsion of the device across the concrete. The screed bars are hollow rectangular members having two useable wearing surfaces. The screed bars may be rotated to bring their second wearing surfaces into contact with the concrete.

Prefabricated masonry structure

Abstract: A description is given of a prefabricated masonry structure having a plurality of rows of masonry blocks which are arranged one above the other and are provided at least partially with cavities, recesses or pockets passing through in the vertical direction. Said prefabricated masonry structure exhibits a lowermost row (1) which comprises blocks (2), filled at least partially with concrete, or one or more concrete screeds or steel cross-members, and an uppermost row (3) which comprises a row of blocks, reinforced by concrete, or one or more upper concrete screeds. The upper row of blocks or the upper concrete screed is provided with holes (4) which pass through vertically. These holes are in at least partial alignment with the cavities (10) of masonry blocks (2) located therebeneath. At least two vertical columns (23) of cavities are filled with concrete and steel bars, strips or the like, which reach to the lowermost row of blocks (1) and thus connect the latter to the uppermost row (3).

Screed floating floor

Abstract: During application of a screed floating floor, the edge insulating strip, which produces a lateral insulation between this screed floating floor and the wall of the building, is not, as previously, fastened on the bottom edge of the wall prior to application of the insulating material layer on the crude floor, but is formed as an angled profile, one leg of which is bonded adhesively to the surface of the insulating material layer to the surface after the latter has been applied. It is thus possible, in spite of different thicknesses of insulating material layers, always to use an equally wide edge insulating strip. Moreover, the formation of footstep sound bridges from screed material is prevented as a result of the good seal against liquids between the edge insulating material and the surface of the layer of insulating material.

Method for drying materials below screed floors

Abstract: The invention relates to a method for drying materials, in particular insulating layers, below screed floors. The dry air is forced in through a gap (6) between screed end face (4) and adjoining building wall (5) at at least one edge of the screed (3) and the moist air is sucked out through a gap (6) between screed end face (4) and adjoining wall (5) at at least one opposite edge of the screed.

Method for the production of flow screed

Abstract: A method for the production of flowable concrete masses, in particular flow screed, in which a segregation-resistant cement paste with a predeterminable water/cement ratio is produced, to which a proportion of sand is added in order to form a homogeneous mortar mixture which no longer separates into its components during its use and the minimum required fluidity of which is set approximately by the addition of a proportion of flow agent determined by preliminary tests and then brought to the desired set point flow value by the addition of further sand. After the mortar mixture has been thoroughly mixed, the additives are added in an amount such that the desired fluidity of the concrete mass is achieved.

Edge-protecting border

Abstract: 1. Arris cover screed angle (10, 10') as corner reinforcement for a stopper coat (13) which is to be applied on the heat-insulating layer (18, 19) of a building provided with a full heat protection jacket and which is to serve as carrier for the screening layer (17) and is reinforced with glass fiber (FRP) fabric mats (11, 12), or arris cover screed angle (70, 70') as reinforcement for at least the corner area of a mineral screening layer (71) to be applied directly upon the - brick or concrete - walls (72, 73) of the building, comprising at least one strip of an FRP material (22, 23') in the form of an angle section made from an FRP fabric suitable for use as reinforcement for the stopper layer, the said strip of fabric reinforced in the corner area, i. e. along the corner of the angle section and the inner, strip-shaped portions of the adjacent legs of the angle and having free - not reinforced - marginal strips (38, 39) exhibiting a width of approx. 4cm which extend beyond the outer longitudinal edges of the reinforced corner area of the section and which - in the applied position of the arris cover screed cover, if the latter is used for reinforcing the stopper and adhesive coat of a full heat protection system - overlaps an adjacent glass fibre mat reinforcement (11, 12) of the stopper and adhesive coat (13) over the greatest part of its width, characterized in that the corner reinforcement of the angle section (10, 10' ; 70, 70') formed by the said reinforcing strip of fabric (23 ; 23') consists of another FRP fabric strip (24 ; 24' ; 24") arranged immediately adjacent the said reinforcing fabric strip (23 ; 23') and is embedded in a plastic material, at least at points distributed evenly over the contact surface of the said two fabric strips (23 and 24 ; 23' and 24', 23 and 24") where fiber bundles of the reinforcing fabric strip (23 ; 23') intersect or are in contact with fibre bundles of the said reinforcing fabric strip (24 ; 24', 24") so that the greatest effective thickness of the plastic layer and/or plastic layer elements formed thereby is equal to the effective total thickness of the said fabric strips (23 and 24 ; 23' and 24' ; 23 and 24") in their contact areas, leaving thin top film layers out or regard.

Device for producing an expansion joint

Abstract: Device which remains in the material and is intended for producing an expansion joint, in particular one in the screed. For this purpose, use is made of a spacer, consisting of compliant material and being in the form of at least one upright leg, and at least one foot for fixing the spacer in position. The device can be produced as a single part or comprise a plurality of parts. The latter includes the use of the upright leg with separate feet for fixing the leg in position.

Thin polymer concrete bridge deck overlays

Abstract: Polymer concrete bridge deck overlay systems that have been used include mixtures containing epoxy, coal tar modified epoxy, polyester, methyl methacrylate and polyurethanes. For thin polymer concrete overlay, a mixture of liquid binder and aggregate is spread uniformly and then struck off using a vibrating screed. Immediately after strike-off, additional aggregate is spread over the surface to improve skid resistance.

Floor-levelling compound

Abstract: Floor-levelling compound for finishing or making good solid floors consisting predominantly of cement screed or anhydrite screed with the aim of minimal damage in the levelling layer and an increase in adhesion as compared with gypsum masses. The object of improving the swelling and shrinking behaviour in addition the an improvement in strength is achieved according to the invention in that the starting mass consists of 50 to 99.8 parts of anhydrite and activator salts, zero to 50 parts of superfine aggregates, 0.1 to 1 part of plasticiser and 0.1 to 1 part of an adhesion promoter.

Apparatus for producing screed

Abstract: An apparatus for producing screed ready for working is described, in which the dry screed supply line and the water supply line lead, strictly separated, into the mixing container of a compressed air-generating screed machine. This apparatus is to be designed according to the invention in such a way that it is also suitable for producing flowing or ... screed, which is not pneumatically conveyable. For this purpose, a pump, preferably a diaphragm or hose pump, which can be driven by the compressed air from the screed machine is provided in the delivery line. In a preferred exemplary embodiment, the supply of the raw materials to the mixing container is regulated by means of at least one filling-level detector.

Device for insulation in the door region

Abstract: Insulating profile for the regions of a door case (4) lying in screed and an expansion joint running between these case regions in the screed, which profile has two profile parts (1), positively enclosing the case (4), and a web part (2), which is displaceable in a perpendicular groove (3) of the profile parts (1), has a lower height than the profile parts (1) and corresponds in its width to the width of a screed expansion joint. The approximately U-shaped profile parts (1) of the insulating profile have a reveal bar (5), wall bars (6, 6'), arranged perpendicularly thereto, and an offset (7) between a wall bar (6') and the reveal bar (5) in the region of the door leaf stop of the case.

Method laying a floating floor and device for implementating the method

Abstract: A method of laying a floating floor, in which the complete surface area of an underfloor, onto which the floating floor (composite floor or floating screed floor) is to be applied, is divided mosaic-like into a plurality of individual surfaces having sides of from 0.5 to 3 m, preferably 1.2 m, and the individual surfaces are each singly provided with the floating floor covering, there being provided between the individual surfaces shrinkage joints, which, after curing of the floating floor covering, are filled with a hardenable material. A device for implementing the method, having a plurality of positioning elements, which can be placed on the underfloor or fastened to it for example toy gluing and which are provided on their surfaces facing away from the underfloor with one or more grooves, and having a plurality of strips which can be introduced in a removable fashion into the grooves of the holding elements in order to form a desired lattice pattern (for example grid formation).

Device for preparing batches of screed, sealing compounds or the like and transferring them to the place of use

Abstract: In order to make it possible to rationalise the work of floor layers and similar workmen using simple and inexpensive means, not only with respect to the amount of work and time required per unit of area or volume of laid screed or poured sealing compound, both during preparation of the individual batches and during transportation thereof to the place of use or laying and during application of the screed or introduction of the sealing compound, and hence considerably to reduce the production costs, but in particular also to eliminate as far as possible the risk of damage to health by considerably facilitating the handling of the batch vessel during all associated operations, from preparation of the batch, to its transfer to the place of use and its application or introduction at this place, and furthermore to increase substantially also the quality of the applied covering or introduced seal by evening out the consistency thereof over its surface, a device for floor layers, workmen or the like for preparing batches of screed, sealing compounds or the like and transferring them to the place of use by means of a transporting frame, capable of moving on the ground and on which the mixing vessel is pivotably mountable as the transporting vessel, is provided.