Abstract: A method and an apparatus are disclosed for cutting rumble strips in the surface of a roadway. The apparatus is a self-propelled machine which includes a frame and a drive mechanism mounted to the frame and adapted for advancing the machine across the surface of the roadway. The machine also includes a generally cylindrical cutting drum that is mounted on the frame for rotation about an axis that is disposed generally parallel to the surface of the roadway. A plurality of cutting teeth are mounted on the outer surface of the drum in a predetermined pattern, and a mechanism is provided for rotating the cutting drum about its axis. The drum is maintained at a predetermined position with respect to the surface of the roadway so that the cutting teeth will cut into said surface a relatively constant, predetermined depth as the drum is rotated about its axis while the machine is advanced along the surface of the roadway.

Abstract: A roadway crack repair system includes a crack cleaning module and a crack sealing module. Each module includes a steerable vehicle for navigating the roadway, a platform being laterally movable on the vehicle in response to a control signal, a sensor being mounted on the platform for detecting local variations in the roadway during movement of the vehicle, a sensed continuous local deviation indicating a roadway crack. A controller is responsive to the sensor for generating the control signal as a sensed lateral position of the crack relative to the sensor, causing the sensor to accurately follow the crack when the vehicle is generally driven along the crack. A router is mounted on the platform behind the sensor of the crack cleaning module for cleaning and widening the crack, and a vacuum system removes loose material from the roadway behind the router.

Abstract: An installation for quick thermal treatment of suspended powder substances, in particular for flash calcining of mineral substances, comprises modules advantageously arranged in mobile units including elements for supplying powder substances, a combustion chamber wherein the substances are introduced suspended in a hot air flux and a cooling assembly where the calcined substances are recuperated to pre-heat the combustion air. The substances are pneumatically transported in the heated air downstream of the supplying elements, via a pre-heating device up to the combustion chamber.

Abstract: An aggregate spreader for spreading a layer of loose aggregate onto a road surface includes a first hopper for receiving the loose aggregate, a plurality of gates or other suitable means associated with the first hopper for dispensing the loose aggregate onto the road surface, a plurality of sensors or other suitable means for sensing characteristics of the road surface, and an electronic controller or other means responsive to the sensors or sensing means and operably associated with the gates or dispensing means for controlling the placement of the layer of loose aggregate onto the road surface. In the preferred embodiment, each of the gates is independently controllable by an associated actuator, and the electronic controller is in electronic communication with the sensing means and in electronic communication with the plurality of actuators for controlling the placement of the layer of loose aggregate onto the road surface by independently controlling each gate of the plurality of gates.

Abstract: A screeding assembly and method is disclosed for spreading, grading, consolidating and smoothing loose or plastic material such as poured, uncured concrete when the assembly moved over an area of the material. The assembly includes a rotatable auger to move the material laterally across the path of travel, a vibratory screed positioned behind the auger to smooth and finish the material, and an elongated engaging member reciprocated laterally across the path at a position between the auger and vibratory screed to facilitate consolidation of the material. Preferably, a plow/striker is positioned in front of the auger to and remove excess material. The assembly may be mounted on a self-propelled vehicle or other support on a boom for moving the assembly over the material, and is preferably controlled by a laser beam responsive elevation control. A kit for attaching the reciprocating engaging member to an existing screed assembly is also provided.

Abstract: This invention provides for painting a second coat upon a set of parallel striped lines in exact registration in one pass of a motorized painting vehicle for such applications as painting aircraft taxi stripes at airports. Beads are also registered on one of the lines in the same pass. Provisions are made for maintaining registration about curved lines by steering around curves with a shortened wheelbase vehicle and by extending paint nozzles for striping a plurality of parallel lines, typically a center twelve inch wide yellow line between two six inch wide black lines, outboard from one side of the painting vehicle. The vehicle comprises two four wheeled units articulated together by a universal articulation joint permitting vertical articulation so that the leading and trailing wheels may be lifted off the ground to reduce the wheelbase for steering around curves.

Abstract: A bi-directional concrete finishing machine finishes a concrete surface in both a forward and a reverse direction, and includes a leading finishing roller and a trailing finishing roller which rotate in a first direction, and two tramming rollers disposed between the leading and trailing finishing rollers, which rotate in a second direction, such that the tramming rollers can be driven in the second direction to move the concrete finishing machine forward and, with the trailing finishing roller disengaged, the leading finishing roller can rotate in the first direction and level the concrete to grade. When the machine is reversed by driving the tramming rollers in the first direction, the leading finishing roller is disengaged, and the trailing finishing roller is driven in the second direction and levels the concrete to grade. Another embodiment of the machine includes a concrete auger for roughing the concrete and spreading it out evenly, which is added as a fifth roller to the machine.

Abstract: Environmental porous pavement materials are formed by encapsulating inner aggregates with cementitious material, adhesive admixture and sealant compounds. Recycled asphalt and recycled concrete products can be used. A mixing machine produces a homogeneous mix of the paving material by surrounding at least part of an aggregate with a coating liquid.

Abstract: Method and apparatus for depositing roadway material on a road bed using a road paving machine having a spreader for laterally spreading the material and a screed for leveling the material. A guide underneath the spreader and the screed is used to control the height of the screed above the road bed. The guide also confines the width of the material deposited by the road paving machine to less than the width of the screed which is normally the standard width of material deposited by the road paving machine.

Abstract: A method of repairing cracks and apertures in a roadway, including the step of filling the crack or aperture with petroleum emulsion and overlapping the crack or aperture with the emulsion to preferably up to one inch or greater beyond the edge of the aperture on each side; applying a layer of an organic, cover blotter material and mounding said cover blotter material to cover substantially the entirety of said petroleum emulsion layer. The emulsion penetrates and softens the pavement surrounding the site. When the emulsion cures, it coagulates with the cover blotter material. The roadway is reopened to allow traffic to pass over the site to further compact and smooth out the roadway repaired surface to eventually form a pliable smooth patch.

Abstract: A method for restoring load transfer capability across a joint between two adjacent concrete slabs includes cutting a slot perpendicularly to the joint and extending into each of the adjoining slabs. The slot and joint are then integrally filled with polymer concrete to tie the slabs together. A joint tie may be placed in the slot and encased by the polymer concrete when restoring load transfer capability.

Abstract: This invention provides for painting a second coat upon a set of parallel striped lines in exact registration in one pass of a motorized painting vehicle for such applications as painting aircraft taxi stripes at airports. Beads are also registered on one of the lines in the same pass. Provisions are made for maintaining registration about curved lines by steering around curves with a shortened wheelbase vehicle and by extending paint nozzles for striping a plurality of parallel lines, typically a center twelve inch wide yellow line between two six inch wide black lines, outboard from one side of the painting vehicle. The vehicle comprises two four wheeled units articulated together by a universal articulation joint permitting vertical articulation so that the leading and trailing wheels may be lifted off the ground to reduce the wheelbase for steering around curves.

Abstract: A control device for controlling the application of a material which is adapted to be applied to a subgrade by means of a road finisher, said road finisher comprising a tractor and a floating screed, which is attached by means of at least one drawarm to the tractor in such a way that said screed is arranged behind said tractor in the direction in which the road finisher is moving when in operation, a first end of said at least one drawarm being secured to the tractor by means of a vertically adjustable coupling device, and a second end of said at least one drawarm being rigidly secured to the floating screed, said control device comprising a device for detecting the height of a screed edge in relation to a reference height, said screed edge being the rear lower edge of the screed in the direction of movement. The control device further comprises a device for detecting the inclination of said at least one drawarm in relation to a reference plane.

Abstract: A portable device is shown for transporting asphalt repair materials for use in repairing potholes in asphalt pavements. The device has a body with a hopper compartment for transporting and dispensing asphalt mix materials. A dry, radiant heat source is located below the hopper compartment and heats the asphalt mix. Tack oils are held and dispensed from a separate tack oil tank.

Abstract: A hot-mix motorized paver is used to deliver fresh pervious pavement mix to form one or more lanes of pavement. The paver is supported on ski-type support runners on parallel side forms. A compacting roller is connected to the paver and rolls along the top of each side form to compact the fresh pavement down to the top of the forms. Indentations are cut into the fresh compacted pavement by rolling a hand powered roller, containing a pointed hoop, across the fresh pavement at select locations to form expansion joints. The pavement is covered with polyethylene sheeting within 20 minutes after completion of placement and finishing, the sheeting is removed after a curing time of approximately seven days, and a concrete saw is used to remove excess pervious pavement that extends beyond the desired paved area.

Abstract: A method of milling is disclosed wherein mill actions from at least two cutting tools cooperate to form each respective depression in a surface of a road. These depression are generally utilized in series to inform an operator of a motor vehicle, using the produced vibration and/or noise, that the motor vehicle has left a normal driving area of the road. Variations of the invention include different methods of regulating elevational movement of each respective cutting tool. These methods include use of eccentric wheels, cam members and electronic control. Stationary positioning of each respective cutting tool on the depression installation machine is explained as is displaceable positioning wherein each respective cutting tool may be moved in a reciprocating manner to decrease operating time where the cutting tool is not capable of performing a milling action. Use of multiple cutting tool sets provide for each respective set to cooperate to form select depressions within a series of depressions.

Abstract: A method of sealing and marking pavement with recognizable indicia. The method can be used in connection with newly formed pavement surfaces or existing pavement which is to be resurfaced. The method includes the steps of providing a marking material to form recognizable indicia on a surface of pavement and applying the marking material to the surface to form such recognizable indicia. The method further includes the steps of providing a protective layer for protecting the recognizable indicia and positioning the protective layer over the recognizable indicia. Next a sealant is provided and applied to an area immediately adjacent the protective layer. The sealant is applied such that its thickness is substantially equal to the thickness of the recognizable indicia. As such, the top surface of the recognizable indicia is in substantially the same plane as the top surface of the sealant.

Abstract: A method of installing a patch in a pothole in a paved road including the steps of (1) undercutting the edges of the pavement defining the pothole to a uniform angle from the vertical; (2) excavating a portion of substratum beneath the pavement to undercut the pavement around the pothole, both undercuttings to increase the size of the patch's footing; (3) lining the undercut with a layer of filler material and tamping; (4) inserting an underlining wire mesh fitted to reach into the undercut beneath the pavement; (5) inserting and tamping additional filler material to an intermediate level of the pothole; (6) inserting a second wire mesh preferably fitted to the periphery of the pothole at the intermediate level; (7) around the periphery of the pothole spacing and anchoring a plurality support dowels into the undercut pavement edges at about the intermediate level; and (8) filling and tamping the pothole level with existing pavement surface.

Abstract: An excavated opening (10) through a pavement (12) of a highway and through the underlying base material (14) to expose a gas main (16) is filled by (i) mixing on site cement, foaming agent and water to produce a fluid grout (26), (ii) mixing the grout with loose excavated spoil (22) in the opening, (iii) agitating the mixture using a hand-held poker vibrator (30), (iv) and repeating this procedure until the level (40) is reached. The level (40) corresponds to the underside of a protective layer (50) which is subsequently applied. The majority of the excavated loose spoil from the opening is reused.

Abstract: Apparatus and methods for recycling concrete pavement in a coordinated procession include a breaker which turns the concrete into rubble first backhoe which rips up and cuts the concrete to rubble chunks, then another backhoe loads the chunks into a self-propelled crusher. If the concrete is reinforced with metallic structures, the first backhoe cuts those along with the concrete. The crusher separates the concrete from any steel and fines in the rubble. The crusher discharges the steels in collection bins mounted thereon. Various bins and ways of dumping them are disclosed. The crushed concrete is discharged to the roadway as multi-gradated aggregate. The crusher can also be made self-leveling by a slope control, slope sensors, and hydraulic cylinders arranged thereon in a closed loop feedback circuit.

Abstract: A paving machine employs in combination a gravity feed HMA hopper and a tack spray assembly and storage tank. Use of the gravity feed hopper permits all HMA or other paving material stored therein to be discharged directly on top of the paving machine's distributing auger. Moreover, because the gravity feed hopper takes up a relatively small percentage of the horizontal area of the paving machine, a chassis of standard or near standard dimensions can receive a tack storage tank of sufficient capacity to permit the paving machine to operate an entire day without stopping the machine to refill the storage tank. Therefore, if used in conjunction with an HMA shuttling apparatus, the paving machine can simultaneously coat a surface to be paved with a tack material and pave that surface with HMA for prolonged periods of time without stopping to refill either the HMA hopper of the tack storage tank.

Abstract: A chemical solution for neutralizing treading surfaces includes a neutralizing agent such as an alkaline silicate neutralizing solution, a suitable dyestuff (non-indicator dye) and a masking agent (indicator dye) for masking the true color of the dyestuff. The masking agent becomes colorless at a pH of 7.0 or greater. The chemical solution is applied to a suitable treading surface, such as a ceramic tile floor, a suitable time after an acid treatment solution of hydrofluoric acid and nitric acid has been applied to the treading surface. Use of the indicator dye in combination with the non-indicator dye in the chemical solution yields a strongly visible color change which distinguishes the areas that have been sufficiently supplied with neutralizing solution from those that have not been sufficiently supplied with the neutralizing solution.

Abstract: A tactile warning surface has an array of tactile elements made of a composite material formed on the surface of an existing substrate. The preferred composite material is a mixture of a dry powder aggregate and a liquid SBR latex. The tactile elements are in the form of truncated cones or flattened domes having a height of about 0.20 inch and a diameter of about 1.0 inch. A method for installing the tactile warning surface includes the steps of placing a mold sheet having an array of mold apertures with shapes corresponding to the tactile elements over the substrate area, injecting the composite material in a semi-liquid state under pressure into the apertures of the mold sheet, allowing the injected composite material to cure and harden, then removing the mold sheet. For increased durability in traffic-bearing applications, a pigment/aggregate mixture can be applied as a coating over the tactile elements and substrate area.

Abstract: Apparatus for pretreating a pothole preparatory to filling thereof including determining the size and/or path of revolution of a treatment member responsive to determining the location and size of the pothole to be repaired; lowering the treatment member into the pothole; selectively revolving said treatment member and/or rotating said treatment member to abrade, compact and densify the portion of the pothole surrounding the surface thereof. Debris or other particulate in the pothole or developed by the abrading operation may be removed by a vacuum member. The pothole may be sprayed with a fluent material to either harden the surface or reduce the porosity of or render the sticky the surface of the pothole to provide a better bond between the pothole and the filler material. The force applied by the treatment member to the pothole surface is sensed and used as feedback information to control the abrading/compressing/densifying force.

Abstract: A method for protecting reflective delineator stripes includes the use of spacer beads disposed along the stripe to protect reflective beads disposed thereon. The spacer beads are of a greater diameter than the reflective beads so that snowplow blades and the like will contact the spacer beads but not the reflective beads. As the snowplow blades impact the spacer beads, the snowplow blades travel along the top of the spacer beads, thereby avoiding contact with the reflective beads.

Abstract: A process and a machine for forming a bonding layer for bonding a bituminous coated material layer on a support. The process includes application of a surface-active agent on the support, application of a bituminous emulsion on the surface-active agent on the support, and application of a breaking agent on the bituminous emulsion to form the bonding layer. A road-type coating made by the process and, therefore, including such a support layer, a bonding layer on the support, and a bituminous coated materials layer on the bonding layer. To perform the process, a machine includes a frame, a displacement mechanism on the frame, a bituminous-emulsion spreader on the frame, a surface-active agent applicator on the frame, and a breaking agent applicator on the frame.

Abstract: Apparatus and methods for recycling concrete pavement in a coordinated procession include a breaker which turns the concrete into rubble first backhoe which rips up and cuts the concrete to rubble chunks, then another backhoe loads the chunks into a self-propelled crusher. If the concrete is reinforced with metallic structures, the first backhoe cuts those along with the concrete. The crusher separates the concrete from any steel and fines in the rubble. The crusher discharges the steels in collection bins mounted thereon. Various bins and ways of dumping them are disclosed. The crushed concrete is discharged to the roadway as multi-gradated aggregate. The crusher can also be made self-leveling by a slope control, slope sensors, and hydraulic cylinders arranged thereon in a closed loop feedback circuit.

Abstract: A method of repairing potholes and oil spots in pavement surfaces including removing the deteriorated asphalt, applying a degreaser to the interior of the void, then applying a sealer, filling the void with fiber reinforced concrete which is allowed to set and overlying the fiber reinforced concrete with a polymer fortified cement and applying a waterproof sealer over the entire repair area to create a waterproof sealed patch to the pavement.

Abstract: In a process and an apparatus for the stabilization or repair of damaged roads, the road surface is milled off and the material is crushed on the site. The surface material so obtained is added with binders of cement, cement sludge, water and/or bitumen emulsion and/or pre-mixed addition material and/or mineral components of the required grain size and amount, and the material so prepared is again built into the road surface.

Abstract: A method for reinforcing materials already in place in the ground using fibrous additives.

Abstract: A method for compensating differential compaction in an asphalt paving mat wherein an asphalt paver has a compaction compensating system that includes a nominal reference, such as an elongate averaging ski, for determining the general profile of the underlying terrain on which a mat of asphalt material is being placed by the paver and a compensating ski for determining localized irregularities of the subgrade and a control system for responsively altering the thickness of the mat being placed by the paver to compensate for differential compaction of the asphalt material such that a generally planar asphalt paving surface is obtained after compaction thereof. Variations of the method include using a stringline for the reference and/or one or two non-contacting sensors for communicating the general profile and localized irregularity determinations of the subgrade to the control system.

Abstract: A modified asphalt composition having improved low-temperature fracture properties is obtained by devulcanizing crumb rubber, preferably ground rubber tire. The devulcanization is effected without the use of harsh oxidizing treatments or the addition of potentially hazardous solvents, by fractional distillation of a mixture of the rubber and crude oil to a temperature at which substantially complete devulcanization occurs and harmful volatiles are driven off, around 300.degree. C. The resulting compositions are relatively inexpensive and simple to produce and, not having been oxidized, may be expected to show better long-term aging and fatigue performance compared to air-blown asphalts and the like. They are also preferable, on grounds of health and safety, to prior paving asphalts containing significant proportions of volatile organic aliphatic or aromatic hydrocarbons.

Abstract: An advertising display method involves marking grass sports fields by bending the grass blades in definite zones and bending or leaving them straight in other zones in order to form an image or a word. The difference in the direction given to the grass blades is quite visible to the spectator. The grass blades are directed by means of an apparatus mounted on rollers which runs on the grass surface. The apparatus also has brushes and/or additional rollers which rotate to straighten the grass blades on definite sectors. The sectors form an image or the letters of a words. The engines which drive the apparatus and the brushes and/or rollers are electrical and are controlled by a computer. The image or word to represent on the grass, as well as the position of the apparatus on the surface to work, are entered in the memory of a computer.

Abstract: A method for operating a hydraulically driven road roller, primarily for compacting bitumen, with which repeated passes are made over a bitumen coating and in which the roller's speed, acceleration, deceleration and direction of travel (forward or reverse) are selected with an operating lever 1 which, via a control panel 8, electrically acts on hydraulic valves (10, 11, 13) controlling a servo 14 which acts on a hydraulic pump 15 driving the propulsion motors of the road roller. The operating lever is moveable from a neutral position to full lever deflection and equipped with a forward/reverse switch 2 for selecting the roller driving direction. The speed of the road roller decreases at a programmed deceleration, when this switch is actuated, until the roller stops, followed by acceleration at a programmed rate to a programmed driving speed in the opposite direction. The roller is brought to standstill at the maximum permissible deceleration when the lever is pulled back.

Abstract: A method for repairing cracks in an asphalt or concrete parking lot includes brushing out the cracks to remove loose soil, filling the crack with an adhesive mixture formed of roofing materials, and placing a relatively flat molded cap of a mat saturated with a rubber and a high quality asphalt after the adhesive mixture has cured for a few minutes.

Abstract: A paving machine has a gravity feed hopper which is capable of delivering by gravity to the paving apparatus substantially all of the paving materials stored in the hopper without employing any internal conveyors. The discharge opening of the hopper is selectively closed by a feeder gate, the degree of opening of which is preferably coordinated with other operating parameters of the machine such as vehicle speed, distributing auger height and/or speed, and screed operation. Use of the gravity feed hopper significantly reduces construction and maintenance costs, provides a more uniform feed of materials from the hopper, and permits the use of a smaller engine. The paving machine as thus constructed is also relatively easy to operate and thus can be controlled by a single operator seated in the vicinity of the screed.

Abstract: Pavement repairs are made by a single person working alone with the new repair apparatus. Blacktop is stored in a sander bin on a truck. An operator periodically replenishes a hopper from the sander bin by aligning the hopper under a discharge assistant of the sander bin and activating the discharge assistant. Standing on a platform at the side of the frame, the operator moves hydraulic controls to move a carriage with hydraulic cylinders from side to side and back and forth on a frame cantilevered from the rear of the truck and anchored to the truck body beneath the sloping sides of the sander bin. The operator aligns an auger guide mounted on the carriage with a hole and lowers a digging auger into the hole. Loose material is removed by air blasts and vacuum. The operator then raises the digging auger and moves the carriage to align the lower end of a sloping discharge chute over the hole.

Abstract: A hydration system having one or more units (10, 10', 10") for providing a continuous flow of water to newly placed concrete has a plurality of spaced elongated soaker tubes (12) extending parallel to a longitudinal axis (14) of the unit. Respective manifold tubes (16-19) are attached to each end of soaker tubes (12) and a supply coupler (32) is in turn attached to the manifold tubes at one end of the unit and an additional coupler (34) is attached to the manifold tubes at the opposite end of the unit. An upper impervious layer (28) is disposed over the tubes (12, 16-19) and a lower pervious layer (28) is disposed under the tubes (12, 16-19). Layers (26, 28) are attached to each other along the outer periphery of the unit and on opposite sides of the tubes by rivets (30) or stitching (42).

Abstract: The invention provides melt-spun polyolefin/polyarylate alloy fibers having an elevated softening point. These fibers are useful in staple lengths for the reinforcement of synthetic geoways (e.g., roadways, runways), especially those fabricated from asphalt-based pavements. The improved softening point of the fibers allows their incorporation into the hot-mix pavement used to fabricate and repair such surfaces without degradation of the fibers by the elevated temperatures found in plants for these manufacture of hot-mix pavements. This invention also provides an improved process for making melts of such allows.

Abstract: A method is shown for recycling asphalt pavement. A high solids lime slurry is prepared by either slaking quicklime or by slurrying dry, hydrated lime. The high solids lime slurry is mixed with crushed aggregate which has been collected by scraping the top surface of an old roadway. The treated aggregate is deposited onto the old roadway and compacted to form a new roadway.

Abstract: In the method for applying horizontal markings to road surfaces, a water-thinnable emulsion paint which is acid-coagulable is used and is brought into contact with an acid. This acid is scattered or sprayed onto or into the sprayed paint, the acid being in the form of an aqueous solution, a powder or particles wetted with acid. The method brings about drying within one or a few minutes. Using road-marking vehicles, horizontal markings can thus be put down with virtually no closing-off of the mobile operations site.

Abstract: A paving machine discharges HMA or other paving materials directly on top of a distributing auger located between the paving material storage hopper and the screed. The distributing auger is then capable of remixing any partially segregated paving materials and of uniformly distributing the paving materials directly adjacent a previously-paved segment. Materials may be discharged on top of the distributing auger from a discharge opening of a gravity feed hopper located adjacent the distributing auger or from an inclined conveyor delivering materials from a more standard hopper mounted near the front end of the paving machine.

Abstract: A method of laying a road characterized by spraying and impregnating a roadbed with 1 g/m.sup.2 to 500 g/m.sup.2 of a liquid water-repellent agent and then laying a road on said roadbed wherein said liquid water repellent agent is fluid at ordinary temperatures and contains as the main ingredients one or more compounds chosen from among silane-type compounds and organopolysiloxane derivatives.

Abstract: The present invention provides a stress absorbing composite for road repair that comprises a low stiffness geotextile, a viscoelastic material disposed over the low stiffness geotextile, and a high stiffness geotextile disposed over the viscoelastic material. Also provided is a method for retarding reflective cracking in an overlay using a stress absorbing composite and a repaired road containing a stress absorbing composite.

Abstract: A method of surface treating workpieces formed of cement, bituminous or other bonding materials to be coated with a cover layer, such as roads, airport and bridge surfaces, and the like, including the steps of roughening the surface to be coated and then cleaning the surface before applying the cover layer, where the roughness depth (RT) corresponds to one-half of the diameter of the largest grain (1) of the surface to be coated or of the cover layer and the width of the undulations of the surface to be coated correspond to the diameter of the largest grain. The undulations can be formed along a single axis or along two axes.

Abstract: An apparatus and method for simultaneously cutting parallel slots in a pavement surface is provided, especially for dowel bar retrofit load transfer restoration at joints. The apparatus includes a movable frame lockable with a brake, plurality of parallel cutting blades rotatably mounted on twin cutting heads on the frame, vertical travel unit for raising and lowering the blades independently or in unison, and horizontal travel units for moving the blades horizontally. One of the twin cutting heads is mounted on each side of the frame, with hydraulic adjusting rams for independently setting the width therebetween. A slurry control system which is mounted on the frame provides the blades with coolant and vacuums up the slurry produced during cutting.

Abstract: An internal metal stitching method for repairing cracks in concrete comprising the steps of cutting slots to facilitate large metal brackets installed every two feet and at alternating angles to the crack. Saw cuts are made in the concrete and near the ends of each large bracket to accommodate end brackets which when fitted resemble a double "t". The saw cuts are cleaned and dryed, filled with a filler resin, and the metal brackets are reinserted and are submerged 1/4 below the concrete surface. The filler is smoothed out to a level flush with the concrete surface. Additional decorative surfaces may then be applied, such as ceramic tiles, carpeting, linoleum or paint.

Abstract: A process for de-icing roadways to which is applied a melting agent to lower the freezing point. In order to save melting agent (salt), the melt water running off the roadway is collected and re-used for de-icing purposes provided that its melting agent content is adequate. To implement the process, use is made of a device for de-icing roadways including, along the length of the roadway, components such as spray nozzles (34) to apply the melting agent and run-off channels (16) to divert the water into a drainage channel (18) connected to a collector channel in its cycle. According to the invention, the run-off channels (16) lead into at least one collector tank (20) which returns the adequately concentrated melt water to the spray nozzles (34) via a supply line (26).

Abstract: Pavement repair equipment designed to hold sand-blasting hoses or other similar devices to clean joints preparatory to sealing those joints. The equipment is mobile being adapted to be moved by an outside powered device and is adapted to move a sand-blasting nozzle along either a longitudinal or transverse joint in the paved surface and to hold a nozzle adjustable at a plurality of angles to the surface. Other equipment which might be held by the equipment would include vacuum nozzles or sealant applicators.

Abstract: There is provided a method and apparatus for repairing pavement quickly, durably, and at low cost which may employ the use of recycled plastic material. The method includes the steps of: lining the hole to be repaired with a cross-laminated plastic vapor barrier, placing a plastic mesh and one or more plastic pencil rods in the hole, optionally supporting the pencil rods with plastic pencil rod supports, and filling the hole with patch material such as asphalt or concrete. The method is useful in the repair or repaving of pot holes, utility crossings and channels, sink holes, wash out damage, edge collapse, intersection grid repair, and similar conditions.