1400 results about "Base course" patented technology

The invention provides an ardealite road base material and a preparation method thereof, and belongs to the field of road base materials. The road base material is prepared from the following raw materials in parts by weight: 850 to 900 parts of phosphogypsum, 5 to 15 parts of quick lime, 40 to 60 parts of cement, 55 to 85 parts of composite curing agent and 8.5 to 13 parts of curing exciting agent. The phosphogypsum is modified, so that soluble phosphorus and soluble fluorine in the phosphogypsum are cured; the curing exciting agent is atomized and added into the mixture of the modified phosphogypsum, the cement and the composite curing agent, so that all the components are in full contact, the hydration effect is promoted, and the strength and stability of the base material are improved. The pavement base material provided by the invention consumes a large amount of phosphogypsum, can effectively relieve the problem of accumulation of a large amount of phosphogypsum, reduces environmental pollution, has good mechanical properties, water stability and durability, is applied to highway construction, and has important environmental protection significance and social benefits.

The invention belongs to the technical field of road construction, and particularly relates to a copper-doped tailing pavement base material as well as a proportion confirmation method and application thereof. The preparation method comprises the following steps: S1, preparing raw materials; s2, a compaction test method is adopted, and the void ratio of the compacted aggregate wrapped with the cement mortar is calculated; s3, according to the volume filling principle, the gravels form a basic framework, the void ratio of the gravels in the compaction state is measured, cement adhesive cement adheres to aggregate, the aggregate is filled in gaps of the framework formed by the gravels, and finally the blending proportion of the copper tailings, the gravels and the aggregate is determined by combining the composition mechanism and volume parameters of the mixture; and S4, calculating the using amount of the steel slag composite cementing material mucilage according to the thickness of the steel slag composite cementing material mucilage wrapping film and the specific surface area of the copper tailings. A skeleton filling theoretical method is adopted, the shrinkage effect of the filler in the skeleton is controlled, the cracking risk is reduced, and meanwhile the high strength is achieved.

The invention provides a design method and system for an ultra-large-particle-size long-service-life asphalt pavement, and belongs to the technical field of long-service-life asphalt pavement design. The method comprises the steps of obtaining basic parameter information of a pavement design project; according to the basic parameter information, the thickness and variation parameters of the pavement structure layers meeting the thickness requirement are initially planned, and the material Poisson's ratio, the temperature distribution of each structure layer and the material modulus are determined; randomly generating pavement structure layer thickness, temperature distribution, material modulus and traffic load parameters by adopting a Monte Carlo method, and carrying out pavement mechanical response calculation; checking the reliability and fatigue damage of the flexible base asphalt pavement according to a fatigue limit theory and a cumulative damage theory respectively; according to the flexible base asphalt pavement rut prediction model, pavement rut checking calculation is performed, the reliability of a pavement structure under the environment-load coupling effect is improved, and the long service life of the pavement structure is achieved.

The invention discloses a cementing material for a solid waste-based road of a coal-fired power plant and a preparation method of the cementing material. The cementing material mainly comprises a cementing component, an alkali-activated component and a reinforcing component, the gelling component is a mixture of coal-fired power plant fly ash and furnace slag; the alkali-activated component is a mixture of alkali residues, red mud, blast furnace slag and coal-fired power plant desulfurized gypsum; the reinforcing component is rice hull ash or peanut hull ash. The mass ratio of the gelling component to the alkali-activated component is (4 / 1)-(10 / 1); and the addition amount of the reinforcing component is 1-3% of that of the main body material. The coal-fired power plant solid waste fly ash, the furnace slag and the desulfurized gypsum are used as main bodies, a small amount of other industrial solid waste is added, and the cementing material belongs to a full-solid-waste low-carbon cementing material and can be applied to a road base, a subbase or a base layer. The invention has the characteristics of low carbon emission, high solid waste consumption, simple production process and strong pavement performance, and in addition, the invention has a good stabilization effect on the problem that part of solid waste heavy metals and sulfate ions in a coal-fired power plant exceed the standard.

The invention discloses an asphalt pavement base crack identification method and device based on a ground penetrating radar, and belongs to the technical field of road engineering pavement maintenance. The method comprises the following steps: 1) carrying out crack image identification on a radar slice map through a YOLOv8n model; 2) based on an identification result, extracting A-scan signals of a crack area, and classifying time-frequency features by using a Light GBM model; and 3) clustering classification results through a'multi-segment clustering + PCA 'analysis method, and filtering false detection cracks. The device is used for executing the method. According to the method, the map and the time-frequency characteristics are fused, the problem that the false detection rate is high due to subjective labeling or objective interference of a single identification method is solved, experiments show that the false detection rate is reduced to 2.8% from 11.2%, and the accuracy and engineering applicability of crack identification are improved.

The invention discloses a semi-rigid base asphalt pavement recessive disease quantitative evaluation method, which comprises the following steps: S1, detecting a pavement in a detection area by using a ground penetrating radar, and carrying out image processing on acquired data to obtain high-quality detection data; s2, analyzing the detection data, performing classification marking on the images of the abnormal areas, recording the positions and sizes of the abnormal areas, and performing core drilling sampling on part of the abnormal areas to determine the disease types of the abnormal areas; s3, collecting deflection values of a normal road surface and an abnormal area by using a falling weight deflectometer, and determining an influence coefficient of the disease on the structural strength of the road surface; and S4, performing quantitative evaluation on the semi-rigid base asphalt pavement according to the influence coefficient and the disease area of the recessive disease. According to the method, the influence of the recessive diseases on the strength of the semi-rigid asphalt pavement can be quantified, the internal condition of the semi-rigid asphalt pavement can be evaluated, and reference can be provided for detection diagnosis and maintenance decision of the recessive diseases in the asphalt pavement.

The invention belongs to the technical field of comprehensive utilization of industrial solid wastes, and particularly relates to a sawing mud-graphite tailing road base material as well as a preparation method and application thereof. The road base material is prepared by mixing saw mud, graphite tailings, a red mud-based cementing material, a reinforcing agent and water. The sawn mud-graphite tailing road base material is applied to a heavy traffic load road base with the strength requirement of 4.0-6.0 MPa. According to the sawing mud-graphite tailing road base material, all aggregates in a traditional road base material are jointly replaced by sawing mud-graphite tailings, and the red mud-based cementing material is adopted for curing, so that the utilization efficiency of solid waste recycling is greatly improved; and the problems of shortage of sand and gravel resources and high material cost of construction engineering in the road engineering construction process are relieved.

The invention relates to the technical field of pavement materials, in particular to a solid waste-based cementing material stable coal-based solid waste road base material and a preparation method thereof. According to the material, secondary modified regenerated coarse and fine aggregate is used as a framework, coal gangue powder and granulated blast furnace slag micro powder are matched, and two-step engineering of dopamine / double-amino-terminated polyethylene glycol co-deposition grafting and high-modulus silicate pre-coating is adopted, so that the synergistic improvement of the surface wettability and the interface density of the aggregate is realized. The system is cooperated with low-modulus excitation liquid and polypropylene fibers, and the mixing uniformity of the material and the quality of an interface transition area are optimized through a thin-pulp stone-wrapping and densification segmentation process. The material gives consideration to high resilience modulus, rut resistance and durability, significantly reduces the problems of high water absorption, weak interface, early cracks and the like of the recycled aggregate, is adaptive to a traditional road construction window, and has good application prospects.

The utility model discloses a rigid-flexible composite honeycomb long-life pavement structure capable of melting snow and ice, which comprises a roadbed layer, a cushion layer, a base layer, a rigid layer and a flexible layer from bottom to top; the rigid layer is composed of honeycomb prefabricated blocks; geothermal heat pipes are placed in the gaps and concave surfaces between the honeycomb prefabricated blocks of the rigid layer itself, the geothermal heat pipes are placed in the width direction of the road surface, the geothermal heat pipes themselves are located at both ends in the width direction of the road surface and are aligned with the positions on both sides of the width of the road surface itself, the geothermal pad pipes themselves are located at both ends in the width direction of the road surface and extend downward to the ground to be connected to the pipe mouth of an air power pump; the flexible layer comprises the concave surfaces in which the geothermal heat pipes are placed between the honeycomb prefabricated blocks of the rigid layer, a flexible filling layer in the gap and a flexible surface layer arranged on the rigid layer; the geothermal heat pipes are made of metal; the utility model ensures that the rigid asphalt pavement can be used for a long time while taking into account the ability to melt snow and ice.

The invention discloses a method for comparing and selecting road base programs in seasonal frozen soil areas, comprising the following steps: step 1: analyzing the special geographical environment of seasonal frozen soil areas, clarifying the evaluation object system of the program, and listing the influencing factors of the research object; step 2: analyzing the manifestation of the influencing factors at all levels, describing the influence mechanism of the manifestation of the influencing factors on the research object, determining the evaluation index system, and constructing a pre-analysis framework for comprehensive evaluation; step 3: based on a data evaluation model, unifying the original observation point data of the evaluation index, obtaining a forward matrix and performing normalization processing to eliminate the influence of the dimensions of the indicators at all levels, and determining the analysis data matrix; step 4: calculating the distance between each evaluation object and the optimal program and the worst program, and using this as the basis for evaluating the pros and cons; step 5: sorting the distance between the evaluation object and the optimal solution and the worst solution, judging the relative closeness of each evaluation object to the optimal program, and realizing the optimal comparison and selection of the program.

The invention discloses a paving device for road base construction, and relates to the technical field of road construction, the paving device comprises a mobile vehicle, a paving mechanism mounted at one end of a base of the mobile vehicle, a stock bin mounted on the base of the mobile vehicle, a discharge pipe communicated with the bottom of the stock bin and an electric gate valve mounted on the discharge pipe, and a stirring mechanism is mounted in the stock bin; the stirring mechanism comprises a transverse plate fixedly connected to the top of the stock bin, a stirring motor mounted at the top of the transverse plate, a stirring shaft fixedly connected to an output shaft of the stirring motor and a plurality of stirring paddles fixedly connected to the side wall of the stirring shaft; the two sides of the stock bin are each provided with a stirring mechanism used for stirring materials. According to the invention, the mixing uniformity of materials in the stock bin can be improved.

The application relates to the technical field of waterproof coiled materials, in particular to a preparation method of an anti-aging modified asphalt waterproof coiled material, which comprises a polyethylene film, a base layer and a modified asphalt base body, wherein the modified asphalt base body comprises the following raw materials in parts by weight: 45-60 parts of asphalt, 10-15 parts of SBS elastomer, 8-12 parts of a softening agent, 3-5 parts of a waterproof functional agent, 4-6 parts of an anti-aging agent, 5-9 parts of SBR, 5-10 parts of a composite filler and 0.03-0.05 parts of an initiator; the anti-aging modified asphalt waterproof coiled material prepared by the method has excellent waterproof performance, heat aging resistance and ultraviolet aging resistance, and the anti-aging modified asphalt waterproof coiled material also has a complex network structure, which endows the base body with excellent mechanical properties.

The invention relates to the technical field of steel bridge deck pavement, in particular to a rivet-free lane-level combined ultra-high-performance concrete pavement structure and a preparation method thereof, and the rivet-free lane-level combined ultra-high-performance concrete pavement structure sequentially comprises a steel panel base layer, a rivet-free composite bonding layer, an unreinforced super-tough cement concrete pavement layer, a shear-resistant bonding layer and a resin concrete functional wearing layer from bottom to top. The ultra-high performance concrete serves as a pavement structure, overall deflection deformation of the bridge deck is reduced, and rigidity reinforcement is achieved. The resin gravel shear-resistant bonding layer effectively enhances the overall synergy and interface safety of the pavement structure through the dual effects of concave-convex surface physical occlusion and interface agent chemical bonding; by adopting the resin concrete functional wearing layer, the pavement flatness and the driving comfort and safety can be effectively improved, meanwhile, through cracks can be prevented from being generated by adopting the upper and lower step seams, and the trapezoidal tongue-and-groove seam structure increases interface bonding to guarantee the durability and usability of construction joints.

The invention relates to the technical field of waterproof coiled materials, in particular to a preparation method of an anti-aging modified asphalt waterproof coiled material, the anti-aging modified asphalt waterproof coiled material comprises a polyethylene film, a tire base layer and a modified asphalt matrix, comprising the following raw materials: 45-60 parts of asphalt, 10-15 parts of an SBS elastomer, 8-12 parts of a softening agent, 3-5 parts of a waterproof functional agent, 4-6 parts of an anti-aging agent, 5-9 parts of SBR, 5-10 parts of a composite filler and 0.03-0.05 part of an initiator. The aging-resistant modified asphalt waterproof coiled material prepared by the preparation method disclosed by the invention has excellent waterproof performance, thermal aging resistance and ultraviolet aging resistance, and the aging-resistant modified asphalt waterproof coiled material also has a complex net-shaped structure, so that a matrix is endowed with excellent mechanical properties.

The invention relates to the technical field of road construction, in particular to a repairing and trimming device for road base paving construction, which comprises a trimming scraper, a first rotating shaft is rotatably arranged on the front side of the top of the trimming scraper, the bottom end of the first rotating shaft is connected with a second rotating shaft through a universal transmission assembly, and a material scattering assembly is arranged at one end, away from the universal transmission assembly, of the second rotating shaft. A shaking generation assembly is arranged on the trimming scraper and used for controlling the side, facing the road, of the material dredging assembly to incline and the front side of the material dredging assembly to tilt. The device has the beneficial effects that when the rotating disc rotates by a half circle, the multiple fixing columns not only knock lump materials in a shaking state, but also bring the materials located at the slope bottom to the position of the slope top, and when the rotating disc rotates by another half circle, the materials are uniformly spread downwards from the slope top, so that the materials are fully scattered and uniformly spread; and the problem that the thickness of the edge of a road is not uniform or the compactness is greatly different due to material caking or non-uniform thickness is avoided.

The invention discloses a nondestructive testing method and system for the modulus of an asphalt road structure layer, and belongs to the technical field of nondestructive testing. According to the structure size of an actual to-be-tested road, a finite element model of the asphalt road structure layer is established, and a deflection point set corresponding to actual deflection detection and a dynamic drop weight load loading area are created; road structure parameter combinations are generated, mechanical responses of the asphalt road structure layer finite element model established by different road structure parameter combinations under the dynamic drop hammer load are calculated in a dynamic drop hammer load loading area, deflection values of a plurality of deflection points in a deflection point set are obtained, a deflection basin database is constructed to serve as a training sample, and the dynamic drop hammer load is calculated; the deflection values of the multiple deflection points serve as input, parameters of the surface layer modulus, the base layer modulus and the soil base modulus serve as output, and an inverse calculation model used for conducting nondestructive testing on the asphalt road structure layer modulus is obtained through training. According to the method, the structural layer modulus can be obtained by directly inputting deflection value data, so that the back calculation process is more accurate and efficient.

The invention relates to the technical field of road deicing, in particular to a road surface ice melting system. The road surface ice melting system comprises a temperature measuring optical fiber, a DTS host, a control end and a plurality of ice melting devices. The temperature measuring optical fibers are laid on two sides of the pavement base layer; the plurality of ice melting devices are arranged on the two sides of the road surface; the temperature measuring optical fiber is divided into a plurality of temperature measuring sections, and the plurality of temperature measuring sections are in one-to-one correspondence with the plurality of ice melting devices; the DTS host can obtain the temperature values detected by the multiple temperature measuring sections in real time, and when the temperature values, obtained by the DTS host, of one or more temperature measuring sections reach the icing temperature threshold value, the control end controls the ice melting device corresponding to the temperature measuring section reaching the icing temperature threshold value to be started, so that hot water is sprayed to the road surface through the spraying head. According to the road surface ice melting system, the problems that an existing system for monitoring road surface icing has great misjudgment performance, if an organic snow melting agent is sprayed, the manufacturing cost is too high, and spraying of inorganic snow melting agents causes corrosive damage to a road are solved.

The invention provides a pavement structure design method based on fatigue damage of a semi-rigid base asphalt pavement, and relates to the technical field of road engineering design. According to traffic parameters of the semi-rigid base asphalt pavement within a design age limit, an equivalent damage method is utilized to calculate an accumulated equivalent axis number of a semi-rigid base and an asphalt layer, and an initial design scheme of the semi-rigid base asphalt pavement is determined; calculating accumulated damage and modulus attenuation values of the semi-rigid base layer under the load action by utilizing a semi-rigid base layer modulus attenuation model in analysis periods one by one, acquiring pavement structure response of the semi-rigid base layer asphalt pavement based on an elastic stratified theory, and calculating the fatigue life of the semi-rigid base layer and accumulated fatigue damage of the asphalt layer by utilizing a fatigue estimation model. And updating and adjusting the design scheme of the semi-rigid base asphalt pavement until all analysis periods are traversed, and determining the optimal design scheme of the semi-rigid base asphalt pavement. The influence of modulus attenuation of the semi-rigid base is fully considered, and the long-term durability of the asphalt pavement is guaranteed.

The utility model provides a roadbed structure capable of preventing roadbed softening, which comprises a soil base layer, an anchoring structure is arranged in the soil base layer, and the anchoring structure is used for anchoring the soil base layer; a first gravel layer is laid on the soil base layer, a lime-soil cushion layer is laid on the first gravel layer, a drainage layer is laid on the lime-soil cushion layer, the drainage layer comprises two rows of concrete slopes arranged on the lime-soil cushion layer in a left-right spaced mode, and a waterproof layer is laid in the middle of the upper surface of the lime-soil cushion layer and located between the two rows of concrete slopes. The waterproof layer is lower than the concrete side slope, a second gravel layer is laid on the waterproof layer, and the second gravel layer is flush with the concrete side slope; according to the roadbed structure capable of preventing the roadbed from being softened, rainwater permeating into the roadbed can be drained, so that roadbed softening caused by the fact that the interior of the roadbed is in a humid state for a long time is avoided, meanwhile, the maintenance cost is low, the supporting performance of the whole structure is good, the influence of thermal expansion and cold contraction and humidity is small, and the drainage layer is not prone to being damaged.

The invention discloses a polymer emulsion composite modified road base material and a preparation method thereof, and belongs to the technical field of traffic infrastructure engineering materials. The polymer emulsion composite modified road base material is prepared from the following raw materials: graded aggregate, super sulfate cement or geopolymer cement, water for mixing, vinyl acetate-ethylene (VAE) copolymer emulsion and a silane coupling agent. The preparation method comprises the following steps: mixing the VAE emulsion with water for mixing to obtain a polymer diluent; mixing graded aggregate with an inorganic cementing material, then adding the polymer diluent, and mixing to obtain a mixture; and then paving, compacting, forming and curing are carried out. By forming a VAE flexible network-C-S-H / ettringite hybrid network, the material has the remarkable advantages of higher mechanical strength and low cost, and can greatly improve and enhance the crack resistance and durability of the road base.

The utility model relates to a two-stage road pavement structure for an unstable roadbed, which is particularly suitable for an unstable area easy to settle and comprises a first-stage pavement structure and a second-stage pavement structure positioned behind the first-stage pavement structure for construction, wherein the first-stage pavement structure is provided with a pre-sedimentation pavement base layer and a prefabricated high-strength concrete interlocking block surface layer, the prefabricated high-strength concrete interlocking block surface layer is arranged on the pre-sedimentation pavement base layer, the second-stage pavement structure comprises a leveling layer and an asphalt surface layer, the leveling layer is located on the prefabricated high-strength concrete interlocking block surface layer, and the asphalt surface layer is located on the leveling layer. And the asphalt surface layer is positioned on the leveling layer. The utility model has the advantages of low manufacturing cost, high bearing capacity, good durability, convenience in construction, easiness in maintenance and replacement and strong adaptability to settlement deformation, and can fully ensure the use of the whole life cycle of the road; subgrade settlement is accelerated; construction is completed in a short time, and the influence on current traffic is small; dismounting and reconstruction are not needed, and resources are saved.

The invention discloses an asphalt pavement maintenance decision-making method based on multi-layer disease data, which comprises the following steps: S1, collecting information, and arranging a test line; s2, synchronously collecting appearance and internal structure detection data of the asphalt pavement; s3, classifying and identifying the diseases, and quantifying according to the road surface damage condition index; s4, identifying disease category, horizon, area and depth information; s5, quantifying the internal structure of the asphalt pavement through PSCI; s6, constructing a maintenance scheme decision tree, and determining a maintenance part and a scheme; and S7, collecting the unit price of each maintenance scheme, and calculating and determining the investment fund of the maintenance scheme. The pavement integrity is evaluated through PCI and PSCI, a corresponding maintenance scheme is formulated, and the cost of the maintenance scheme is calculated, so that the treatment precision of the surface layer and the base layer can be positioned to reach the centimeter level, the traditional full-section, full-depth and full-width extensive maintenance is avoided, a large amount of maintenance cost can be saved, and good economic and social benefits are achieved.

The invention belongs to the field of waterproof coiled materials, and discloses an ionic crosslinking wide damping temperature range self-healing asphalt waterproof coiled material. The waterproof coiled material comprises an upper surface isolating layer, an upper surface modified asphalt coating material layer, an upper inner modified asphalt coating material layer, a tire base layer, a lower inner modified asphalt coating material layer, a lower surface modified asphalt coating material layer and a lower surface isolating layer which are sequentially arranged from top to bottom, the coating material raw materials of each modified asphalt coating material layer comprise the following components: an asphalt matrix, a maleic anhydride modified styrene-butadiene-styrene thermoplastic elastomer, carboxy nitrile rubber, nitrile rubber, ethylene vinyl acetate rubber, an auxiliary agent, rubber powder and an inorganic filler. By means of designing a coating material formula, a production process and the like of the waterproof coiled material, the waterproof performance, the self-healing performance and the damping performance of the waterproof coiled material are improved, the damping problem of a building is effectively solved, and the waterproof performance, the damping performance and the self-healing performance are effectively considered fundamentally.

The invention discloses a green low-carbon road construction technical system based on a basalt product and a construction mode. The method comprises the following steps: (1) early-stage preparation work: roadbed excavation and material preparation; (2) paving plain soil, and spreading water, cement, basalt solid waste and an alkali-activated material; (3) mixing and curing a roadbed layer; (4) laying thin slurry layers; (5) pavement layer materials are laid, and a cement concrete pavement with basalt fiber reinforcements is formed; (6) installing a pavement intelligent temperature control system; and (7) maintaining the pavement layer. According to the green low-carbon road construction technical system based on the basalt product, the basalt solid waste is adopted as an improved soil roadbed material, the cement consumption and cost are saved, and the carbon emission in the road construction process is effectively reduced.

The utility model relates to the technical field of template mounting and dismounting, and discloses a device for quickly mounting and dismounting a template in a limited space, which comprises a main body mechanism, and is characterized in that the main body mechanism comprises a ditch body, a pavement base layer, a leveling layer, a steel pipe, universal wheels, a steel plate, a cast-in-place reinforced concrete cover plate, I-shaped steel, a pull rod hole, a through hole, a pull rod body and a matched nut, the pavement base layer is fixedly arranged at the outer end of the ditch body, the leveling layer is fixedly arranged at the upper end of the pavement base layer, the steel pipe is located in the ditch body, the universal wheels are fixedly installed at the lower end of the steel pipe, the universal wheels are located at the upper end of the pavement base layer, and the universal wheels are movably connected with the pavement base layer. According to the quick mounting and dismounting device for the formwork in the limited space, by mounting the main body mechanism, a traditional cast-in-place cover plate support construction technology is changed, original ground welding assembly is adopted, the whole formwork is hoisted to the corresponding position to be fixed, and the quick mounting and dismounting device has the advantages that time consumption is low, the support body can be recycled, cost is saved, and the safety risk is low.

The invention provides an optimization design method of a fiber rubber gravel seal layer for inhibiting pavement reflection cracks. The optimization design method comprises the following steps: determining optimal fibers; determining an optimal aggregate; preparing a plurality of groups of third test pieces by taking the optimal fiber dosage, the optimal aggregate spreading amount and the optimal rubber asphalt dosage as variables through an orthogonal test; and combining the third test piece with the base layer with the crack and the overlay layer, preparing a fourth test piece, carrying out a reflection crack simulation test, and determining the combination of the material with the optimal crack resistance according to the test result. The method takes the reflection crack resistance of the fiber rubber asphalt macadam seal as a main evaluation index, and has the advantages of scientificity, reasonability and accuracy compared with the prior art. The fiber rubber gravel sealing layer obtained through the design method has excellent reflection crack resistance, the crack resistance of the composite pavement can be remarkably improved, the pavement maintenance and repair cost can be reduced, the pavement service cycle can be prolonged, and the fiber rubber gravel sealing layer has wide popularization and application prospects.

The invention discloses a municipal road rapid repairing structure and a construction method thereof.The municipal road rapid repairing structure comprises a plurality of base layer repairing blocks, the base layer repairing blocks are installed in grooves formed in damaged parts of a roadbed, every two adjacent base layer repairing blocks are connected in an inserted mode, and buffer repairing blocks are arranged on the upper surfaces of the base layer repairing blocks; the buffer repairing blocks are connected in an inserted mode, the upper surfaces of the buffer repairing blocks are covered with surface layers, the base layer repairing blocks are connected in an adhesive mode through fast curing adhesives, and the base layer repairing blocks and the roadbed are connected in an adhesive mode through fast curing adhesives. And the base layer repairing block and the buffer repairing blocks as well as the adjacent buffer repairing blocks are also bonded and connected through the rapid curing adhesive. The prefabricated base layer repairing block and the buffer repairing block are adopted, so that the cast-in-place and maintenance time is shortened, road repairing can be completed in a short time, and the influence on traffic is reduced. And the repairing blocks are further reinforced through rapid bonding glue, so that the strength of the whole repairing structure is improved.

The invention relates to the field of road engineering detection and maintenance, and discloses a rapid evaluation method and system for the bearing capacity of bottom grouting of a road assembly type prefabricated slab, and the method comprises the following steps: scanning a bottom grouting layer of the assembly type prefabricated slab, and obtaining radar image data of a void area; testing pavement deflection basin data, and obtaining a corresponding relation between a deflection value and a position in combination with geometric information of the void area; a void recognition model based on deep learning analyzes radar image data, recognizes an unfilled area and extracts spatial geometric features of the unfilled area; in combination with a modulus inversion calculation model, performing inversion calculation on a grouting layer modulus, a base layer modulus and a roadbed modulus; based on a mechanical model, evaluating the bearing capacity reduction rate of the void area and the condition that the bearing capacity of the veneer is insufficient; and the grouting effect is judged according to the evaluation result, and an optimized construction suggestion is generated. The quality of the grouting layer can be evaluated quickly and accurately, scientific construction guidance is provided, and the grouting construction quality and maintenance efficiency of the fabricated pavement slab are remarkably improved.

The invention provides an efficient grouting widening construction method for a new and old water-stabilized base layer, and belongs to the technical field of grouting construction.The efficient grouting widening construction method comprises the steps that foundation treatment is conducted on a widening area, and an old road side line is kept straight; excavating steps and setting elevation control; preparing a water-stable mixture and a cement grouting body according to a designed ratio; a synchronous grouting machine is fixed to one side of a splicing seam of the paver; blending cement paste and carrying out double-layer stirring; a cement paste permeation and diffusion control system is adopted for precise grouting, and the cement paste outlet amount is dynamically adjusted; an Euler loop rolling path planning system is used for guiding rolling operation, and a splicing area is rolled twice through a small road roller; after completion, immediately covering and preserving for seven days; and the optimal material composition is designed through a water-stable mixture proportioning optimization system. According to the method, efficient connection and integrity improvement of the splicing position of the new and old cement-stabilized base layers are achieved through a systematic process and an accurate control means.

The invention discloses a multistage phase-change temperature-regulating asphalt pavement structure for relieving urban heat island effect, which sequentially comprises an upper surface layer, a lower surface layer, a base layer and a subbase layer from top to bottom, the upper surface layer is formed by a first asphalt mixture doped with a wide-temperature-range phase-change temperature-regulating system A, and the lower surface layer is formed by a second asphalt mixture doped with a wide-temperature-range phase-change temperature-regulating system B; the volume of the wide-temperature-range phase-change temperature-adjusting system A is 7-10% of the volume of the first asphalt mixture, and the wide-temperature-range phase-change temperature-adjusting system A is formed by compounding a plurality of different composite organic eutectic phase-change materials; the lower surface layer is formed by a second asphalt mixture doped with a wide-temperature-range phase-change temperature-adjusting system B, the volume of the wide-temperature-range phase-change temperature-adjusting system B is 5-10% of that of the second asphalt mixture, and the wide-temperature-range phase-change temperature-adjusting system B is formed by compounding a plurality of different composite organic eutectic phase-change materials. The composite organic eutectic phase change materials with different wide temperature range phase changes are introduced into the upper surface layer and the lower surface layer of the asphalt pavement respectively, and heat in the pavement structure can be greatly absorbed through combination of the organic eutectic phase change materials.