Showing papers on "Screed published in 2004"

VOC- and SVOC-emissions from adhesives, floor coverings and complete floor structures.

Abstract: area (loading about 0.4 m 2 /m 3 ) with about 100 g/m 2 (primer), 1000 g/m 2 /mm (screed) and 300-600 g/m 2 (adhesive) making them an important possible source for VOC/SVOC-emissions, additionally to those from the floor covering. Within the research project ''Environmental and health quality of composite building products'' which Abstract Emissions of volatile organic compounds (VOC) and semivolatile organic compounds (SVOC) from materials for flooring installation (primer, screed, adhesive, floor covering) were measured by means of emission test chambers and cells over a time period of at least 28 days at 23 � C, 50% relative humidity and an area specific air flow rate of q ¼ 1.25 m 3 /m 2 h. Single com- ponents were tested in comparison to three complete structures (same concrete, primer, screed, adhesive) with different types of floor covering (PVC, carpet, linoleum). Sorption into concrete/screed and different permeability of flooring materials affected the emissions from the complete structures. The complete structures with linoleum and PVC showed the same types of emission and emission rates as the individual floor coverings themselves. Emissions from the carpet-covered structure resulted also from the lower layers. In all cases emis- sions from the complete structures were lower than the sum of emissions from the single components. For two adhesives the formation of secondary emissions (aldehydes and organic acids) was observed starting after the standard testing time of 28 days.

Apparatus and method for improving the control of a concrete screed head assembly

Abstract: A soft landing control system (10) for a screeding device (12) is operable to automatically lower a vibrating member (24) of a screed head assembly (14) into engagement with a concrete surface at a time and place where the vibrating member is not positioned over an overlap area of already screeded concrete. The vibrating member is automatically lowered onto newly placed concrete at or near the junction or cold-joint between the already screeded concrete and the area of newly placed concrete, so as to avoid depressions in the already placed concrete. Optionally, the soft landing control system may include a timing device and may lower the vibrating member after a period of time following an activating event. Optionally, the control system may detect when the vibrating device is positioned at or near the newly placed concrete and may lower the vibrating member in response to such detection.

Screed comprising recycled glass waste

Abstract: A screed for applying to eg a concrete slab, etc to give a smooth surface finish comprises recycled glass waste sand residue. In a preferred embodiment the screed comprises (i) recycled glass waste or a recycled glass waste sand residue in the form of an agregate or powder; and (ii) a calcium sulphate powder binder.. A method for production of a screed is described as well as a method for remediation of recycled glass waste.

Pavement recycling machine and method of recycling pavement

Abstract: A pavement recycling assembly includes a frame defining a grinding chamber and a mixing chamber. The grinding chamber carries a rotatable laterally-extending toothed grinding drum and the mixing chamber houses at least one toothed rotatable mixing wheel. A screed assembly is disposed behind the mixing chamber for extruding said mixture at a desired height so as to form a pavement. Pavement is recycled in-situ using the recycling assembly by grinding existing pavement, adding fluid asphalt to the pavement, optionally adding supplemental pavement, and mixing the fluid asphalt with the existing and/or supplemental pavement. The mixture is then extruded at the proper height by an adjustable screed. The recycling assembly may be suspended under a self-propelled chassis so that it can be shifted laterally to engage a pavement surface selected for repair without moving the entire chassis.

Extension screed for a paving vehicle

Abstract: An extension screed is for a paving vehicle screed assembly that includes a main screed. The extension screed includes two base members movably connectable with the main screed and two vertical actuators each extending between the main screed and a separate base member. Each vertical actuator linearly displaces the connected base member with respect to the main screed in opposing vertical directions. A carriage preferably includes an inner frame movably connected with the base members and an outer frame slidably disposed about the inner frame and configured to support a screed plate. The vertical actuators vertically displace the carriage and alternatively pivot the carriage within a vertical plane. Further, a first horizontal actuator displaces the inner frame with respect to the two base members in opposing horizontal directions and a second horizontal actuator displaces the outer frame with respect to the inner frame in opposing horizontal directions.

Screed mold method

Abstract: A process of molding using a screed mold including a metal plate (A110) having slots (A111), mold cores (A113), a perimeter (A115) and bolt holes (A116).

Apparatus and method for working asphalt pavement

Abstract: A method and apparatus for working asphalt pavement, comprising one or both of a mechanical, hydraulic, electric, or pneumatic means for providing high-speed rotation; a rotary tool comprising a first end comprising a working surface and a second end adapted for connection to the means for providing high-speed rotation; and a screed, cooperatively arranged with the rotary tool, and comprising a working surface adjacent the working surface of the rotary tool, wherein the rotary tool is spun at high speed and applied to the asphalt pavement, frictionally heating the asphalt pavement to a temperature sufficient to work the pavement locally adjacent rotary tool and the screed. The screed and rotary tool comprising abrasion resistant materials selected from the group consisting of high-strength steel, hardened alloys, cemented metal carbide, polycrystalline diamond, and cubic boron nitride. The rotary tool and the screed apparatus may comprise a closed loop control system.

Portable vibratory concrete screed

Abstract: A portable vibratory concrete screed is described. The screed includes a screed blade including a flat bottom surface extending between a front edge of the screed blade and a rear edge of the screed blade. The screed also includes a vibrator cartridge assembly, with an eccentric weight, releasably coupled to the screed blade. The blade assembly is capable of receiving many different blade styles. The screed includes a handle assembly extending from both sides of the vibratory assembly. The handle assembly includes adjustable and lockable grips.

Segmented concrete screed

Abstract: A segmented concrete screed for screeding concrete on a concrete casting bed includes a plurality of individual screed units each of which may be raised and lowered independently of the others such that screeding operations may selectively bypass obstructions in the concrete to be screeded.

Screed bar for vibratory screed

Abstract: A screed bar for a vibratory concrete screed is formed from a long hollow extrusion having generally flat enclosing walls and defining in cross section two triangular sections that share a common interior wall.

Folding end gate for screed assembly

Abstract: An end gate assembly for a screed for a paving machine, where the screed is provided with a screed hinge component, includes a frame having a frame hinge portion that is adapted to mate with the screed hinge component to form a hinge having a hinge axis about which the frame may pivot. In a preferred embodiment of the invention, the end gate has a pair of hinges. More specifically, the preferred end gate has a first frame portion having a first hinge portion and a second hinge portion. The first hinge portion is adapted to mate with the screed hinge component to form a first hinge having a first hinge axis about which the first frame portion may pivot. This preferred assembly also includes a second frame portion having a hinge member that is adapted to mate with the second hinge portion of the first frame portion to form a second hinge having a second hinge axis about which the second frame portion may pivot.

Which instruments should surveyors use to monitor moisture condition

Abstract: This paper discusses the concept of “monitoring” moisture content (MC) as a surveying aid in connection with appraisal of buildings and when assessing the drying out of buildings, for example, after flooding damage. It also presents the findings of testing of various instruments to record the drying out of brick, timber and cement screed specimens. Conclusions are drawn on the most appropriate methods for the surveyor to use when monitoring the MC of construction materials.

Paving material smoothing device and paving material smoothing method, and compacting device and pavement surface compacting method

Abstract: A three-dimensional position of a paving material smoothing device is measured by a GPS, and a paving material supplied onto a pavement surface is smoothed out according to the measured position while the shape of the bottom of a screed is varied so as to match a target shape of the pavement surface corresponding to the three-dimensional position. Alternatively, a three-dimensional position of a compacting device is measured by a GPS, and a pavement surface is compacted according to the measured position while the shape of a compacting surface of a compaction roller is varied so as to match a target shape of the pavement surface corresponding to the three-dimensional position. These enable a pavement surface to be easily constructed to a target shape.

Process for heating a screed of a road paver and corresponding road paver

Abstract: of EP1036883The method involves using a heater (H) built into the application board (B) with several electrical heating elements (E) driven by a three-phase generator (G). At least one of the heating elements is switched on and off during the application phase An Independent claim is also included for an electrical heater.

Vibratory screed for a paving machine

Abstract: A screed assembly (14) for a paving machine (10) is provided The screed assembly (14) includes at least one screed plate (22) having an electrically actuated vibratory unit (26) positioned at a location sufficient to controllably vibrate the screed plate (22) The vibratory unit (26) is a self-contained vibratory system having an electric motor (30) driving a rotating mass (34) Each screed plate (22) included in the screed assembly (14) may be provided with a respective electronically actuated vibratory unit (26)

Cement-bonded screed

Abstract: Cement-bound flooring comprises cement, additives and water. The mixture contains 200-500 kg/m3> crushed stone having a maximum grain size of 0.09 mm and an average grain size of 0.03-0.05 mm. The additive is a mixture of 0.5-6 % solvent, 0.02-0.25 % aluminum powder and 1-3 % plastic dispersion.

Vibrating Character of Compacting Mechanism of Paver

Abstract: The pavement medium is compacted and finished by screed mechanism,and the dynamic perfor- mance of the mechanism effects on pavement density and levelingBased on a dynamic model of a vibratory compacting mechanism and computer simulation,dynamic governing of the mechanism are studied and the in- fluence of parameter variety to the dynamic characteristic in the system are analyzedThe multi-function paver was tested for different pavement materials through adjusting tampering frequent and vibrating amplitudes of compacting mechanism of paver,and analyzing this effect on density and leveling in pavement

Heat and impact sound-insulating materials

Abstract: The invention relates to insulating materials for impact sound and heat insulation, which are obtained from water and an insulator composition. Said materials are characterized in that they comprise a closed-cell foam granulate, a cementous binder and at least one water retention agent and have a water/cement ratio of 0.7 to 3.0. The insulator compositions can be formulated to have a very large ratio of foam granulate and very little cement. The insulators produced on the basis thereof have good mechanical and insulating properties. The inventive insulator compositions are mainly used in floor screed works.

Expansion joint for concrete work

Abstract: An expansion joint for concrete works, especially for paving concrete-based surfaces, in which said joint initially acts as a screed bar and guide rail for classic surface vibrators, which is formed by means of the functional combination of two profiled metallic pieces (1, 2), having a considerable length, essentially having a right triangular section, coupled by means of tongue and groove through one of their lateral sides (3), corresponding to one of the catheti of their section, such that both pieces together configure an isosceles triangle profile resting on the ground by means of height-adjustable supports and incorporating in correspondence with their top edge a pair of plastic strips (9) forming said guide for the surface vibrators.

Two-layer ironing board for road paver

Abstract: The utility model belongs to the road surface machinery, and relates to a screed part for road surface pavers, in particular to a dual-layer screed for road surface pavers. The screed comprises a frame fixedly connected with the vehicle body of the road surface paver, a front screed and a rear screed arranged in the front part and the rear part of the frame respectively. The frame is equipped with two upright fixed baffle plates on the right side and the left side respectively, and the baffle plates are equipped with a horizontal hydraulic cylinder on the internal sides respectively. The hydraulic cylinders are so positioned as to correspond to the front screed and the rear screed respectively, and the front ends of the hydraulic pushing rods of the hydraulic cylinders are separately connected with the sides of the inner ends of the front screed and the rear screed respectively. The utility model is capable of adjusting the working width of the screed within a certain scope to fulfill the requirement for construction on different road surfaces, with the advantage of flexible and reliable actions.

Installation method for coverings of natural or agglomerated stones by assembling preformed regular elements

Abstract: The invention relates to a method for the installation of coverings, in particular floors, of natural or agglomerated stones, or other materials. The method consists in the dry installation of a plurality of tiles (1, 2) on a suitable screed or mortar bed, and is characterized in that modules of proper shape and dimension are pre-assembled before installation by joining at least two tiles together.

Concrete finishing screed

Abstract: A cement finishing screed is provided which comprises a frame member extending a length of the screed. The frame member includes a first lower beam member, a second lower beam member, an upper beam member, and a plurality of truss members securing the first and second lower beam members and the upper beam member together in a fixed relationship. Each truss member has two arcuate rod portions extending from the first lower beam member and the second lower beam member, respectively, to the upper beam member, and a strut portion extending from a lower end of one of the rod portions to a lower end of another of the rod portions.

Apparatus for forming an accurate screeding profile

Abstract: A method has a guide beam (4) incorporating a spirit level and a slide (2) fitted onto the top of the beam. One side of the slide has an adjustable wedge (3) which funnels screed (9) to the bottom lip where a defined strip of screed is laid as the slide is moved along the beam. The slide is U-shaped and the beam can be fitted with leveling means at one end to cater for sloping base layers. The system can also be used for wall coatings.

Screed for a road paver

Abstract: not available for EP0974699Abstract of corresponding document: US6190087A paver screed has a main screed with two outer side walls, at least one of the side walls being provided with insertion orifices for the releasable mounting of at least one lateral screed extension by means of fastening elements capable of being inserted through the insertion orifices. A screed extension has fastening elements that comprise hydraulic cylinders which each have a piston that is spring-biased into an initial, retracted position. The cylinders are actuated by hydraulic fluid to displace or extend the piston against the biasing action of the spring. Preferably, the hydraulic cylinders are connected a hydraulic circuit of the main screed. The piston of each hydraulic cylinder carries a shank capable of being inserted through a proximal insertion orifice and which are preferably provided with an abutment element configured for attaching the cylinder to the sidewall of the main screed.

Effect of Dynamic Stiffness and Mass of Resilient Sound Mat Material on the Impact Sound Performance of Floor-Ceiling Assemblies

Abstract: This paper describes how it is becoming more common in buildings in North America to require construction of floor-ceiling assemblies that address impact and airborne sound. Resilient sound mats composed of either rubber or plastic materials are commonly used in these assemblies to improve their sound reduction capability. Rubber mats are typically heavy, and can be manufactured in a wide range of dynamic stiffness. In this case rubber mats were used that varied between 6 and 8 kg/m2 and of dynamic stiffness of 16 to 52 MN/m3. Plastic weave mats are typically lighter, 0.8 kg/m2 and have a dynamic stiffness of 28 MN/m3. On top of these mats is poured a screed material, typically composed of lightweight concrete. Finished flooring is then placed on top to complete a floor assembly. All of these materials are non-proprietary and generally available. This combination of products may be referred to collectively as floor toppings. The effectiveness of the resilient materials were measured on both massive (concrete floor) and less massive (joist floor with lightweight sub floor) structures for performance comparison.

Expansion joint for concrete works

Abstract: An expansion joint for concrete works, especially for paving concrete-based surfaces, in which said joint initially acts as a screed bar and guide rail for classic surface vibrators, which is formed by means of the functional combination of two profiled metallic pieces ( 1, 2 ), having a considerable length, essentially having a right triangular section, coupled by means of tongue and groove through one of their lateral sides ( 3 ), corresponding to one of the catheti of their section, such that both pieces together configure an isosceles triangle profile resting on the ground by means of height-adjustable supports and incorporating in correspondence with their top edge a pair of plastic strips ( 9 ) forming said guide for the surface vibrators.

Panel for climate control of enclosed spaces

Abstract: An unfinished panel (1), particularly for climate control systems, comprising a first layer (2) of insulating material that has, at a first surface (3), seats (4) for the arrangement of a plurality of pipes (5) adapted to convey a heat transfer fluid, the pipes being anchored and/or embedded in the seats by a second screed layer (10) that is associated at the first surface, the first layer having, on the opposite side with respect to the first surface, means (19) for abutment and/or connection to a wall and/or floor and/or ceiling.

Partition device for preventing intrusion of plied timber into screed part of road paving machine

Abstract: PROBLEM TO BE SOLVED: To easily adjust the height of a partition plate from the outside, without interrupting paving work, in a road paving machine whose screed part is provided with a partition device for preventing intrusion of a composite material. SOLUTION: A cover bracket 17 is provided in a suspended state in a lower part of a supporting arm 13 between a back end of a main screed 12 and a front end of a second expansion screed 15. The partition plate 18, which is formed in an almost rectangular shape in a side view, is provided inside a lower part of the cover bracket 17; a front end of the partition plate 18 is pivotally mounted on the back end of the main screed 12; and a back part of the partition plate 18 is supported on the supporting arm 13 via a suspension adjusting means 20. The partition device is formed so that the height of the back ed of the partition plate 18 can be adjusted by the means 20. COPYRIGHT: (C)2005,JPO&NCIPI

Screed and compacting vibrating board for compacting and profiling the concrete of a tunnel floor comprises a construction support having wheels connected via vibration dampers

Abstract: Screed and compacting vibrating board (10) comprises a vibrating board shell (11) which is placed on concrete, and a construction support (12) supporting the vibrating board shell and having wheels (4) for traveling on a floor shell wagon (5) which supports the upper edge of the concrete of the tunnel floor and the concrete of the raised region of the flank (6). The wheels are connected via vibration dampers (3) to the construction support of the vibrating board. Preferred Features: The vibration dampers are made of rubber-metal.

Apparatus for applying a binder for an asphaltic paving on a traffic surface

Abstract: There is provided an apparatus for applying a binder for an asphalt pavement on a road surface with an asphalt paver, supported with the frame (1) of the asphalt finisher, of a distribution device for the asphalt mix in the direction of travel (7) downstream screed (8) for compressing and smoothing the built- described asphalt mix and with a device connected to a storage container for the binder, of the distribution device for the asphalt mix upstream, with spray nozzles (6, 26, 27) assembled spray bar (2) comprising a central part (3) and retractable side members (4). In order to provide simple constructional conditions, it is proposed that the extensible side parts (4) of the spray bar (2) around a deflection roller (16) guided and the guide roller (16) in a along the longitudinal side of the chassis (1) and a transversely thereto having extending strand (18) divided plate-link chain (15) such that the extending transversely to each vehicle longitudinal side branch ((18) of the plate link chain (15) of the two extendable side parts (4) of the spray bar (2) on a pull-out side portion (11) of the screed 8) engages, while the (along the longitudinal side of the vehicle frame 1) extending chain strand (17) with a return actuator (20) is connected, and that the link chains (15) carrying individually controllable spray nozzles (26).