120 results about "Wearing course" patented technology

The invention discloses a preparation method and application of a full-particle-size steel slag gradient carbonized artificial aggregate suitable for an asphalt ultrathin wearing layer, relates to a preparation method and application of an artificial aggregate, and aims to solve the technical problems that the strength of the existing carbonized steel slag aggregate is low, and multi-element solid waste resources cannot be comprehensively utilized. The method comprises the following steps: carrying out crushing, magnetic separation and screening on steel slag to obtain particles with different particle size grades; and sequentially carrying out pre-curing, granulation curing, pre-curing and post-curing treatment on each grade of particles to obtain the full-particle-size steel slag gradient carbonization artificial aggregate. The average carbon fixation amount of the aggregate is 12.4%, the average free calcium oxide content is 0.32%, the average compressive strength is 54.32 MPa, and the volume expansion rate is 0.32% when the aggregate is kept at the temperature of 60 DEG C for 5 days. When the aggregate is used for preparing an ultrathin wearing layer SMA-10 type asphalt mixture, the dynamic stability is 13285 times / mm, the immersion Marshall is 96.5%, and the anti-skid BPN value is 0.76. The method can be used in highway fields.

The present invention relates to the field of asphalt modification technology, and more particularly to a modified asphalt composite material, a preparation method and its application in ultra-thin wearing layer, including the following parts by mass of raw materials: 4 6 parts of SBS, 3 5 parts of LDPE, 3 5 parts of epoxy castor oil, 2 4 parts of octamercapto POSS modified wood fiber, 1 3 parts of antifreeze agent, 0.1 0.2 parts of mixed catalyst, 6 10 parts of modified asphalt, 5 8 parts of waste tire rubber powder, 100 parts of basalt wear-resistant aggregate; the antifreeze agent is mixed by (0.7 0.9) with AB modified mesoporous copper sulfide, ILs GO, and bisaldehyde PEG in a mass ratio of (0.2 0.3) : (1); the modified asphalt is mixed and kneaded by 10 parts of petroleum asphalt and 0.6 1.2 parts of tetraallylsilane. The modified asphalt composite material prepared by the present invention has good anti-freeze cracking performance, and has certain intrinsic self-repairing performance.

The invention provides a self-adhesive pavement local disease repair blanket and a preparation process and application thereof, the repair blanket is of a rectangular sheet structure, and sequentially comprises an anti-wearing layer, a high-viscosity tough asphalt layer, a self-healing composite structure layer, an anti-crack reinforcing layer and a self-healing bonding layer from top to bottom. The self-healing composite structure layer is composed of a crack limiting induction film layer and a shape memory polyurethane strip. Through the collaborative design of introducing the anti-crack reinforcing layer and the high-viscosity and tough asphalt layer into the repairing blanket structure, the stress fluctuation transmitted by base cracks can be effectively buffered, and the stress concentration degree of the surface layer is reduced, so that the occurrence of reflection cracks is inhibited, and the structural integrity of a pavement repairing area is improved; a self-adhesive composite structure which can be used at normal temperature is adopted, traditional operation steps such as heating, mixing or sealing layer laying are not needed in the construction process, the construction process is simplified, and the maintenance time is shortened.

The invention relates to the technical field of road engineering, and discloses a light-weight long-service-life asphalt pavement composite layer and a construction method of a pavement structure, and the light-weight long-service-life asphalt pavement composite layer sequentially comprises a high-toughness anti-skid ultrathin wearing layer, an anti-rutting composite modified middle surface layer, a high-toughness porous anti-fatigue leveling layer and a high-viscosity asphalt synchronous gravel sealing layer from top to bottom; the thickness of the high-toughness anti-skid ultrathin wearing layer is 1.5-3.0 cm, and the structural depth of the surface of the high-toughness anti-skid ultrathin wearing layer is not less than 0.8 mm; the thickness of the anti-rutting composite modified middle surface layer is 2.5 to 4.5 cm; the thickness of the high-toughness porous anti-fatigue leveling layer is 3.0 to 5.0 cm; and the thickness of the high-viscosity asphalt synchronous gravel sealing layer is 1.0 cm. According to the scheme, by increasing the structure depth of the surface of the high-toughness anti-skid ultrathin wearing layer, the service life equivalent to or even longer than that of a conventional asphalt pavement is maintained while the thickness is greatly reduced, and the problem that the overall service life of the conventional ultrathin asphalt pavement is short due to insufficient anti-skid performance is solved.

The invention discloses a steel bridge deck combined pavement structure with high strength and corrosion resistance and a construction method thereof. The steel bridge deck combined pavement structure sequentially comprises a steel panel base layer, a middle pavement layer, a bonding layer and a wearing layer, wherein the middle pavement layer is formed by basalt chopped fiber UHPC and basalt fiber composite material grid ribs; the middle pavement layer is obtained by casting basalt chopped fiber UHPC on site, and meanwhile, the basalt fiber composite material grid ribs are arranged in the UHPC. On the premise that the overall thickness of the steel bridge deck combined pavement structure is effectively reduced, the overall corrosion resistance and strength of the steel bridge deck combined pavement structure can be greatly improved.

The utility model relates to the technical field of asphalt pavement maintenance, in particular to an ultra-thin wearing layer asphalt pavement maintenance device which comprises a mobile vehicle body, a material storage box is fixed on one side of the mobile vehicle body, a lifting assembly is fixed on the mobile vehicle body, and a paving assembly used for pushing wearing layer materials is fixed at the lifting bottom end of the lifting assembly. A side frame is fixed to one side of the paving assembly, a cleaning assembly used for cleaning the surface of the paving assembly is fixed to one side of the side frame, and a height-adjustable material scraping assembly is fixed to the bottom of the side frame. And then the paving assembly is used for uniformly pushing the wearing layer paving material to the road edge direction, and the scraping assembly with the adjustable height is used for further leveling the wearing layer paving material leveled by the paving assembly, so that the paving thickness of the wearing layer paving material is kept uniform.

The invention discloses a resin type bio-based high-viscosity adhesive material for an anti-skid wearing layer pavement and a preparation method of the resin type bio-based high-viscosity adhesive material, and belongs to the technical field of road engineering materials. The resin type bio-based high-viscosity glue material for the anti-skid wearing layer pavement is prepared from the following raw materials: asphalt, vulcanized rubber powder, a resin matrix, a tackifier, a curing agent, a plasticizer, an antioxidant, a heat stabilizer and an auxiliary agent. Wherein the asphalt is a mixture of plant asphalt, coal asphalt and petroleum asphalt; the resin matrix is a mixture of polyurethane resin, epoxy resin, a polystyrene-butadiene copolymer, 2-methylpropyl methacrylate and a polymer of styrene and 2-ethylhexyl acrylate. The high-viscosity glue provided by the invention not only remarkably improves the bonding capacity of the resin type bio-base of the prefabricated pavement and the original road surface, but also greatly improves the wear resistance, weather resistance, high cohesiveness and toughness of the material, and remarkably improves the pavement performance of the resin type bio-base of the prefabricated pavement.

The utility model discloses a spliced pavement structure of a dilatation reconstruction expressway project, which comprises an old road structure layer, a gravel roadbed, a new roadbed, a drainage component, a drainage layer, a stress dispersion layer, a bearing layer and a wearing layer, old road widening steps are arranged on the old road structure layer, the drainage component is arranged on the old road steps, and the new roadbed is arranged on the old road widening steps. The gravel roadbed is laid at the side end of the old road structure layer, a new roadbed is laid on the gravel roadbed, and a drainage layer is laid on the new roadbed; a new pavement structure and an old pavement structure are lapped in a mode of excavating steps on an old road, an L-shaped gravel drainage structure easy to splice and mount is additionally arranged at the positions of the steps, and a gravel roadbed is adopted as a newly spliced wide roadbed, so that water in the old road is gradually discharged into the gravel roadbed through the L-shaped gravel drainage structure; and the water is discharged into a side drainage facility in a scattered manner, so that the water in the old road pavement structure is effectively removed, and the damage of the old road pavement structure is prevented from being aggravated.

The invention discloses a gradient carbonization-silane coupling synergistically modified steel slag and an ultrathin wearing layer preparation method, and belongs to the field of solid waste recycling and road pavement engineering. The invention aims to solve the problems of insufficient volume stability and poor adhesion with an asphalt interface caused by the fact that a compact calcium carbonate layer on the surface of the carbonized steel slag aggregate hinders an internal reaction. The method comprises the following steps: firstly, carrying out gradient pressure carbonization on the steel slag, rapidly forming a compact calcium carbonate layer on the surface of the steel slag through high-pressure carbonization, and promoting substances such as free calcium oxide in the steel slag to continuously react through low-pressure carbonization; then, treating the carbonized steel slag by adopting a silane coupling agent, and improving the volume stability of the carbonized steel slag and the adhesion of the carbonized steel slag to asphalt by virtue of the chemical bonding effect of the silane coupling agent; finally, the composite modified steel slag is applied to the ultrathin asphalt wearing layer, so that the comprehensive pavement performance of the asphalt mixture can be improved. The method provided by the invention can synergistically solve the problems of utilization of solid waste steel slag, shortage of natural aggregate, insufficient pavement performance and the like, and has environmental protection benefits and engineering application values.

This invention discloses a method for coordinated control of asphalt pavement paving and compaction, relating to the field of asphalt pavement construction technology. Before operation, the invention inputs basic data to the central control unit and calibrates the lower limit of the allowable temperature for compaction. During paving, it collects the three-dimensional position coordinates of the paver, the temperature data of the loose layer, and the thickness data of the loose layer. During compaction, it collects the three-dimensional position coordinates and trajectory of the roller, the temperature data of the compacted layer, and the compaction degree value. The central control unit synchronizes and matches the data, calculates the temperature drop rate, and issues elevation adjustment and additional compaction commands after comparing deviations. This invention enables precise coordination between paving and compaction processes, real-time calculation of the temperature drop rate and remaining compaction time, automatic elevation adjustment, and issuance of additional compaction commands, improving the construction quality and stability of ultra-thin wearing course layers, reducing early-stage defects, and extending the service life of the pavement.

The application belongs to the technical field of polymer materials, and discloses a modified asphalt for durable thin-layer pavement, a preparation method, application and wearing layer thereof; the modified asphalt comprises the following components in mass fraction: 100 parts of asphalt, 10-20 parts of thermoplastic elastomer, 2-5 parts of tackifier and an additive; the tackifier is phthalonitrile resin; the thermoplastic elastomer contains not less than 90 wt% of SBS; the modified asphalt is synergistically modified by the tackifier and the thermoplastic elastomer, so that the obtained modified asphalt has excellent high-temperature performance, low-temperature performance and aging resistance, and is particularly suitable for durable thin-layer pavement; and the wearing layer prepared by the modified asphalt has excellent fatigue durability.

The application relates to a kind of asphalt pavement road surface texture modeling methods based on three-dimensional discrete element model, comprising: step S1: selecting representative coarse aggregate from the aggregate constituting asphalt pavement wearing course, obtaining the surface topography as the first real aggregate profile model after scanning each selected coarse aggregate;Step S2: based on the first real aggregate profile model, the three-dimensional discrete element model of asphalt mixture is constructed as the asphalt pavement model, the micro-mechanical properties between the aggregate particles in the asphalt pavement model are given, and the texture parameters and the inter-particle porosity of the asphalt pavement model are calculated;Step S3: the surface texture parameters and the inter-particle porosity of the real asphalt pavement with the same aggregate and gradation are calculated, and compared with the texture parameters and the inter-particle porosity of the asphalt pavement model, if the error is too large, then return to step S2 to adjust the micro-mechanical properties between the aggregate particles in the asphalt pavement model.Compared with the prior art, the application can accurately simulate pavement texture and establish the corresponding relationship between wearing course texture and skeleton.

The utility model provides a consolid pavement structure with drainage ditches, which belongs to the technical field of road paving and comprises a road and drainage ditches arranged on one side or two sides of the road. The road comprises a roadbed and a first consolid stable layer laid on the upper surface of the roadbed, a first coarse particle reinforcing layer is arranged on the first consolid stable layer, and a wearing layer is laid on the first coarse particle reinforcing layer; second consolid stable layers are arranged on the side walls of the two sides of the drainage ditch. Coarse-grained gravels in the first coarse-grained reinforcing layer are squeezed together after being rolled and have high supporting capacity, the first coarse-grained reinforcing layer enables the roadbed and the first consolid stable layer to have high pressure-bearing capacity, the pressure-bearing capacity of the first coarse-grained reinforcing layer is 2-3 times that of a common consolid road surface, concave lane marks are not prone to being formed on the road surface, and the road surface is not prone to falling off. Accumulated water can also be discharged into the drainage ditch along the road surface, and the service life of the road can be effectively prolonged.

The novel large-span steel bridge deck pavement structure comprises a steel bridge deck slab, an anti-corrosion layer, a bonding layer, a waterproof layer, a drainage layer, a protection layer and a wearing layer are sequentially laid on the steel bridge deck slab from bottom to top, the bonding layer is a hot melting type epoxy resin bonding layer, a drainage groove is formed in the top of the drainage layer, and the protection layer is arranged in the drainage groove. The protective layer is made of cast asphalt concrete, the wearing layer is made of high-performance asphalt concrete, premixed asphalt macadam is embedded in the protective layer, and modified emulsified asphalt tack coat oil is spread between the protective layer and the wearing layer. The utility model provides a novel large-span steel bridge deck pavement structure which is provided with an anti-corrosion layer, a hot-melt epoxy resin bonding layer, a waterproof layer, a drainage layer, a protection layer and a wearing layer, provides an effective protection system for a steel bridge deck, and provides a durable bridge deck with good driving performance for a bridge.

The present application relates to a kind of detachable combined steel bridge deck pavement structure, including steel bridge deck, corrugated steel plate, T-shaped stiffener, ribbed steel bar, ultra-high performance concrete, asphalt concrete wearing layer, high-strength bolt;Wherein, the corrugated steel plate is connected with the top plate of steel bridge deck by high-strength bolt in flat section, and corrugated section is arranged corresponding to longitudinal stiffener of steel bridge deck;The web of T-shaped stiffener is perforated, and the weld is connected with the flat section of corrugated steel plate in the direction of bridge;The ribbed steel bar is passed through the web of T-shaped stiffener perforated, then pours ultra-high performance concrete, realizes and steel bridge deck joint action;Finally, pour asphalt concrete wearing layer, form detachable combined steel bridge deck pavement structure.The present application provides a kind of detachable combined steel bridge deck pavement structure design reasonable, with the advantages such as large rigidity, light weight, easy to disassemble, can effectively improve the fatigue performance of steel bridge deck.

The utility model is applicable to the technical field of asphalt paving, and provides high-viscoelastic asphalt mixture paving equipment for ultra-thin overlay construction, which comprises a machine body, a conveying chain arranged on the machine body and used for conveying asphalt mixture, and two hoppers arranged on the machine body, overturning driving elements are arranged between the left side surface and the right side surface of the machine body and the lower surfaces of the two hoppers located on the two sides of the conveying chain, retractable baffles are arranged in the sides, close to the conveying chain, of the hoppers, rotating bases are arranged on the front sides and the rear sides of the hoppers, and the rotating bases are installed on the machine body; according to the high-viscosity and high-elasticity asphalt mixture conveying device, high-viscosity and high-elasticity asphalt mixtures in the hopper are blocked through the retractable baffles, the problem that the high-viscosity and high-elasticity asphalt mixtures fall onto a conveying chain, and consequently the conveying chain is bent is solved, and the high-viscosity and high-elasticity asphalt mixture conveying device is simple in structure, convenient to use and high in practicability. And normal conveying of the high-viscoelastic asphalt mixture is ensured.

The utility model relates to the technical field of pavement repair, and discloses a self-adhesive pavement local disease repair blanket which comprises a repair blanket body and a limiting device, the repair blanket body comprises an anti-wearing layer, a high-viscosity asphalt layer, an anti-crack layer and a bonding layer, and the anti-wearing layer, the high-viscosity asphalt layer, the anti-crack layer and the bonding layer are sequentially arranged from top to bottom. The top surface of the high-viscosity asphalt layer is bonded with the bottom surface of the anti-wearing layer, the bottom surface of the high-viscosity asphalt layer is bonded with the top surface of the anti-cracking layer, the bottom surface of the anti-cracking layer is bonded with the top surface of the bonding layer, and the limiting device is arranged on the anti-wearing layer. Clamping blocks can be adjusted to different positions through sliding grooves, sliding blocks and first extension springs, repair blanket bodies with different rolling sizes can be conveniently adapted, the distance between two fixing rods can be adjusted according to the use requirements of personnel through arrangement of a connecting assembly, and therefore the repair blanket bodies with different widths can be adapted.

The present invention provides a fully solid waste environmentally friendly road structure containing a steel slag wearing layer and a construction method thereof, belonging to the technical field of road engineering. Coral sand is used to pave a precipitate absorption layer on the roadbed, and modified red mud or modified phosphogypsum is used to fill the roadbed in layers on top of the precipitate absorption layer. Under the condition that the bearing capacity requirements are met, an asphalt structure combination layer of a certain thickness is directly paved on the roadbed, and the anti-skid wear layer in the asphalt structure combination layer is paved with steel slag aggregate instead of part of the stone. The pavement structure has a simple construction process and low cost, and can avoid soil and groundwater pollution caused by the infiltration of residual harmful substances in red mud or phosphogypsum solid waste, while realizing large-scale road use and high-value utilization of materials such as steel slag, red mud, phosphogypsum, and coral sand.

The application discloses a kind of road surface wearing layer materials based on ceramic solid waste and its preparation method and application, belong to the technical field of pavement surface layer material in road engineering.The application solves the defects such as poor bonding effect of ceramic solid waste particles and matrix asphalt in traditional mixture process, significant attenuation of mixture water stability, and utilizes ceramic solid waste to reduce the problems caused by the decline of road performance while fully exerting the advantages of material thermal resistance characteristics and anti-skid characteristics.The application uses thermosetting epoxy asphalt as binder, replaces mineral aggregate with ceramic solid waste broken aggregate, adopts pellet pressing type construction process, so that the prepared road surface wearing layer material has good heat conductivity, and correspondingly improves the fatigue strength of wearing layer material, has excellent anti-skid performance and wear resistance.

The invention discloses a construction method for repairing a broken slab of an airport pavement and a sandwich composite structure. The construction method comprises the following steps: S1, prefabricating a cement concrete pavement slab serving as a main body of a new pavement slab according to parameters; s2, a cement laitance layer on the surface is removed, and an interface binder is brushed after the cement laitance layer is removed; s3, a wearing layer is poured, and a flexible and elastic polymer composite material is adopted; s4, performing anti-skid treatment on the upper surface of the wearing layer to form an anti-skid layer; s5, the damaged old pavement panel is removed; s6, the interface of the base layer is coated with the interface binder; s7, a bed slurry layer is arranged after the interface binder is brushed; s8, the prefabricated new pavement slab is installed on the bed mortar layer and leveled, and then joints are filled; s9, after standing maintenance, joint cutting is conducted, and joint sealing materials are filled; and S10, opening the traffic after cleaning the site. Compared with the prior art, according to the new pavement formed through construction, the combining capacity of the new pavement slab and the old pavement slab or the base layer serving as the base plane is high, and the overall abrasion resistance and durability are remarkably improved.

The utility model relates to the field of pavement maintenance, and discloses a pavement wearing layer maintenance device which comprises a transport vehicle, a heating tank is fixedly connected to the top of the transport vehicle, a first gear is rotatably connected to the top of the inner side of the heating tank, a second gear is slidably connected to the top of the inner side of the heating tank, and the first gear and the second gear are meshed with each other. A gear ring is fixedly connected to the interior of the heating tank, the second gear is meshed with the gear ring, stirring rods are fixedly connected to the bottom of the first gear and the bottom of the second gear, a plurality of evenly-distributed stirring blades are fixedly connected to the peripheries of the two stirring rods, and a feeding pipe is fixedly connected to the periphery of the heating tank. According to the stirring device, the first gear rotates by starting the first motor, and the second gear rotates around the first gear in a planet wheel mode, so that the interior of the stirring device is fully stirred through the stirring rod and the stirring blades, raw materials are stirred more evenly, and the raw materials are heated evenly.

The present application relates to a method for asphalt thin layer overlay construction of cement bridge and pavement and a crack pouring device, the method comprising: 1) old cement bridge and pavement detection and treatment; 2) bonding layer construction: spraying modified emulsified asphalt on the old cement bridge and pavement to form a bonding layer, 3) ultra-thin wearing layer paving: using a synchronous paver, paving on the bonding layer to form an asphalt thin layer overlay, the paving thickness is 1.5-2.5 cm; 4) rolling and opening to traffic: using a steel wheel roller to roll the pavement for 2-4 times. The interlayer bonding strength between the added asphalt thin layer overlay and the old cement pavement is greater than or equal to 1.2 MPa, effectively preventing delamination; the asphalt thin layer overlay can effectively inhibit the generation and expansion of reflection cracks, has excellent high and low temperature performance and water stability, the pavement added thickness is significantly reduced, only 1.5-2.5 cm, reducing the material consumption, structural load and highway auxiliary facility adjustment.

The invention discloses a modified emulsified asphalt mixture and an ultrathin wearing layer preparation method, and belongs to the field of road engineering, the modified emulsified asphalt mixture is prepared from the following components by weight: 10-16 parts of emulsified asphalt, 6-9 parts of epoxy resin, 3-9 parts of a flexibilizer, 0.1-0.5 part of a coupling agent, 90-110 parts of aggregate, and 10-15 parts of a composite filler; the composite filler is one or a mixture of furnace bottom ash, fly ash and polyamide fiber, and through physical crosslinking of the flexibilizer and chemical curing of the epoxy resin, the toughness and bonding performance of the emulsified asphalt are remarkably enhanced; meanwhile, the basalt aggregate is pretreated by adopting the silane coupling agent, so that the surface characteristics of the aggregate are optimized, the interface bonding force between the aggregate and the modified asphalt is greatly improved, and the problem of insufficient performance of a traditional material under traffic load is fundamentally solved.

The present invention belongs to the technical field of pavement construction, and discloses a pavement grinding device for laying a crack-resistant wear layer on a pavement, comprising a frame, a water tank fixedly mounted in the middle of the top of the frame, a water inlet provided at the top of the water tank, a water storage pipe fixedly connected to the middle of the bottom of the water tank, the water storage pipe and the frame being embedded and installed, and a fixed sleeve provided at the bottom of the inner cavity of the frame. The present invention realizes the automatic expansion of the grinding head by the pressure of cooling water. Since the cooling water is always in a released state during the grinding process, that is, the pressure provided by the cooling water replaces the pressure provided by the traditional oil cylinder or electric cylinder, the device structure can be simplified while the endurance of the device can be improved. At the same time, when the grinding head contacts the ground, the cooling water can be automatically discharged, and vice versa, the cooling water can be automatically closed, thereby realizing the automatic opening of the cooling water during grinding and the automatic closing of the cooling water when the machine is shut down, which can significantly reduce the cost of use and the consumption of water resources.

The invention discloses a large-area bridge deck pavement rapid repairing structure and a construction method. The structure comprises a re-paved asphalt pavement layer, a high-performance concrete cast-in-place layer, an original concrete leveling layer and a height self-adaptive adjustment support system. An ultra-thin wearing layer or an asphalt concrete surface layer is selected as the re-paved asphalt pavement layer, the high-performance concrete cast-in-place layer is composed of high-performance fiber concrete and a reinforcing mesh, and the height of the support system is matched with the thickness of a bridge deck pavement system so as to ensure that the elevation is not changed before and after bridge deck pavement repair. According to the structure, only the leveling layer of about 1cm is finely milled and planed on the surface layer, the high-performance concrete cast-in-place layer acts together with the original concrete leveling layer and the main beam, and the weight reduction effect of the bridge deck pavement layer is achieved through self-adaptive matching of the height of the support system. The problems that according to a traditional scheme, the construction period is long, the number of on-site operating personnel is large, the clearing volume of construction waste is large, an original bridge is prone to being damaged and the like are solved, and the construction efficiency of the operation expressway bridge floor is seriously influenced are solved.

The utility model relates to the technical field of wharf surface wearing layer leakage prevention, and discloses a wharf surface wearing layer expansion joint leakage prevention structure which comprises a wharf surface base body and a plurality of C-shaped steel channels used for forming an expansion joint in the wharf surface base body, and every two C-shaped steel channels form a group to be arranged at the top of the wharf surface base body. And each group of C-shaped channel steel is internally provided with an anti-leakage assembly for preventing the wearing layer of the wharf surface base body from leaking. By means of the anti-leakage assembly, in the using process, it can be guaranteed that the C-shaped steel channel is stably installed, loosening and falling are avoided in the using process, water can be prevented from entering a wharf face base body wearing layer along with gaps of a cement layer, and meanwhile the problem that a bearing rubber pad deforms can be avoided; by means of the connecting assembly, the problem that in the using process, a large gap exists between every two adjacent sets of C-shaped steel channels before a cement layer is poured, and consequently the later anti-seepage effect is reduced can be solved.

The invention relates to the technical field of pavement pothole rapid maintenance methods, in particular to a pavement pothole rapid maintenance method covering an ultrathin wearing layer, which comprises the following steps: (1) preparing a modified cold patch material; (2) preparing an ultrathin wearing layer material; (3) cleaning the pit slot; (4) coating a bonding layer; (5) filling a cold patch material; (6) laying an ultrathin wearing layer; (7) curing; (8) opening traffic; according to the invention, the modified cold patch material and the ultrathin wearing layer are innovatively combined, so that the contradiction between the material performance and the construction process is ingeniously solved. The use of the modified cold patch material solves the problem of insufficient strength of the traditional cold patch material, and the introduction of the ultrathin wearing layer greatly improves the durability and aging resistance of the repaired area. The multi-layer structural design not only realizes the complementation of the performance of each component, but also generates a remarkable synergistic effect.

The invention discloses a novel assembly type pavement composite structure for pavement maintenance and a construction method thereof. The structure is composed of a structural layer obtained after finish milling of an old road, a flexible leveling transition layer, a concrete prefabricated slab structural layer, a stress absorption functional layer and an ultra-thin overlay wearing layer. A flexible leveling transition layer is laid on a structural layer after finish milling of an old road, then concrete prefabricated slabs are installed and spliced, a concrete prefabricated slab structural layer is obtained after connection between the concrete prefabricated slabs and slab joint treatment, an anti-crack patch is laid, and a stress absorption layer and an ultrathin cover wearing layer are sequentially laid. The invention focuses on key technologies such as a flexible leveling transition layer fine leveling method, a concrete precast slab efficient load transfer connection method, a durable anti-seepage joint filling method between concrete precast slabs, an ultrathin cover surface anti-sliding and anti-cracking construction method and the like, and establishes a perfect fabricated pavement novel combined structure and system for pavement maintenance. And the blank of large-scale application of the fabricated pavement technology in the highway field is filled.

The invention discloses an asphalt concrete wearing layer based on an RAP material and a construction method, belongs to the technical field of building materials, and aims at solving the problems that in the prior art, a wearing layer material is large in porosity and high in requirement for adhesion of asphalt and aggregate; and the asphalt concrete wearing layer adopting the RAP material is poor in high and low temperature resistance and mechanical property. A construction method of an asphalt concrete wearing layer based on an RAP material comprises the following steps that coarse aggregate, fine aggregate, mineral powder, recycled RAP waste and a composite warm mixing agent are mixed, and a uniform mixture is obtained; the uniform mixture is subjected to paving, initial pressing, re-pressing and final pressing, and the asphalt concrete wearing layer of the RAP material is prepared. The prepared asphalt concrete wearing layer based on the RAP material has the characteristics of excellent high and low temperature resistance, excellent mechanical strength such as shear strength and the like.

The utility model relates to the technical field of aging test devices, and discloses an asphalt wearing layer accelerated aging test device which comprises an annular test bed, a laying groove is formed in the upper surface of the test bed, an asphalt wearing layer body is laid in the laying groove, and a test tire is arranged on the asphalt wearing layer body. A driving motor used for driving the test tire to move on the asphalt wearing layer body is arranged in the middle of the test bed, and a water spraying unit used for controlling the humidity of the asphalt wearing layer body, a heating lamp used for controlling the temperature of the asphalt wearing layer body and an ultraviolet lamp used for irradiating the asphalt wearing layer body are further arranged on the side face of the test bed. According to the utility model, the test tire performs a friction test on the asphalt wearing layer body, the water spraying unit controls the humidity of the asphalt wearing layer body, the heating lamp controls the temperature of the asphalt wearing layer body, and the ultraviolet lamp irradiates the asphalt wearing layer body, so that the asphalt wearing layer can be simulated under various conditions; and the accuracy of accelerated aging test data of the asphalt wearing layer body is improved.