532 results about "Pavement maintenance" patented technology

The invention relates to waterborne polyurethane epoxy resin modified emulsified asphalt, which comprises an ingredient A and an ingredient B, wherein the ingredient A is modified alicyclic amine epoxy resin curing agent aqueous solution, the ingredient B consists of the following ingredients in mass parts: 5 to 40 parts of waterborne polyurethane epoxy resin and 60 to 95 parts of emulsified asphalt, and the mass percent ratio of the ingredient A to an ingredient B is 1 / 10 to 1 / 30. During application, the ingredient A and the ingredient B are proportionably and uniformly mixed, and the waterborne polyurethane epoxy resin modified emulsified asphalt is obtained. Various indexes of the modified emulsified asphalt are all superior to those of the modified emulsified asphalt in common use in markets, good low-temperature flexibitity and high-temperature stability are realized, the brittle rupture is not easily caused under the loading effect, the adhesivity with stone materials and pavements is good, the binding force is strong, and the waterborne polyurethane epoxy resin modified emulsified asphalt can be used for pavement maintenance or can be used as cementing materials of preventive maintenance and pot hole repair materials.

The invention belongs to the technical of bituminous pavement maintenance materials, and particularly relates top a cold mixing bituminous concrete and a preparation method thereof. The self temperature adjustment cold mixing bituminous concrete is characterized by being prepared from the following raw mateirals in percentage by weight: 70-80 percent for the aggregate, 1-3 percent for the filler, 5-10 percent for the composite phase change material, 8-10 percent for water and 6-8 percent for the modified emulsified asphalt. The composite phase change material is made of wax and expanded graphite composited together, the mass ratio of the expanded graphite and the wax is 1:8-9, the phase change temperature of the composite phase change material is 40-50 DEG C, and the phase change heat is 150-160kJ / kg. The process is simple, the cost is low and implementation is easy. The concrete has the function of reducing pavement temperature.

The invention discloses an aqueous epoxy resin modified emulsified asphalt, and a preparation method and an application thereof. The aqueous epoxy resin modified emulsified asphalt comprises 100 parts of emulsified asphalt, 10-300 parts of aqueous epoxy resin, and a curing agent accounting for 3-60% of the use amount of the epoxy resin. The modified emulsified asphalt obtained in the invention has high-temperature stability and low-temperature flexibility, and the bonding strength of the modified emulsified asphalt at a low temperature and a high temperature of 60DEG C is 2-6 times that of commercial common emulsified asphalt or SBR and SBS modified emulsified asphalt when used as road bonding oil. The aqueous epoxy resin modified emulsified asphalt is a single-component system, has excellent storage stability, can be directly applied in field, is simple to construct, can be mechanically constructed, and overcomes the disadvantage of wheel sticking of common or the SBR and SBS modified emulsified asphalt bonding oil in the construction process. The modified asphalt has good bonding performance with stones, concrete pavements and asphalt pavements, and can be widely applied to pavement maintenance or preventive maintenance.

The invention relates to a bituminous pavement digging-milling-repairing integrated system device comprising a car body, wherein a digging-milling part, a crushed return material part, a microwave stirring and blanking part and a compaction part are sequentially arranged in front and back of the car body; the digging-milling part is used for carrying out digging-milling treatment on a bituminous damaged part of a pavement; the crushed return material part is used for collecting dug and milled bituminous concrete waste; the microwave stirring and blanking part is used for treating the collected dug and milled bituminous concrete waste and blanking to a digging-milling area again; the compaction part is used for carrying out compaction treatment on a dropped material and complementary bituminous concrete. According to the bituminous pavement digging-milling-repairing integrated system device, digging-milling, recycling regeneration, padding and repairing parts are integrated into a whole, dug and milled waste is recycled to be added with appropriate emulsified asphalt to heat to reuse, and the bituminous pavement digging-milling-repairing integrated system device is high in environmental protection and high in working efficiency. The bituminous pavement digging-milling-repairing integrated system device is small in number of transmission links, compact in structure and high in space utilization. By utilizing the bituminous pavement digging-milling-repairing integrated system device, the operation efficiency of pavement maintenance is effectively improved, the labor intensity is lightened, the off-time of each process is effectively shortened, the compaction uniformity of a reworked material of the bituminous concrete is improved, the pavement maintenance quality is improved and service life is prolonged.

The invention discloses inorganic nano-material modified asphalt and a preparation method thereof; the inorganic nano-material modified asphalt is prepared by a modifier composed of carbon nanotubes and nanometer cerium dioxide, and asphalt, wherein the inorganic nano-material modified asphalt comprises the following components by weight: 90-95% of asphalt, 0.1-0.5% of carbon nanotubes, and 4.9-9.5% of nanometer cerium dioxide. The modified asphalt of the invention has good high temperature and low temperature resistance and aging resistance, can prolong the service life of roads, reduce pavement maintenance cost, and is applicable to the paving of engineering such as high-grade roads, airport runways, parking lots, bridges, etc.

The invention is applicable to the technical field of image recognition, and provides a pavement damage detection method, a device and a terminal device. The method comprises the following steps: firstly, a pavement image collected by a collecting device is acquired; Then the pavement image is inputted into the first depth learning model to obtain the pavement abnormality detection results; finally, the pavement abnormality detection results are sent to the monitoring center, so that the monitoring center can alarm according to the pavement abnormality detection results. The pavement image iscollected by the collecting device, and input to the first depth learning model through the image recognition method for calculation, the abnormality detection result of that pavement is obtained, Atthe same time, by presetting the first depth learning model in the terminal equipment, the detection of the pavement image can be completed in the terminal equipment, so as to disperse the pavement detection task, improve the detection efficiency of the pavement damage, and further provide high-efficient and high-quality data support for the pavement maintenance work.

The invention relates to an environmental-protection self-snow-melting asphalt pavement admixture and a preparation method thereof. The environmental-protection self-snow-melting asphalt pavement admixture is prepared from a component A, a component B and a component C, wherein the component A is solid particles formed by K<+> or Na<+> or Ca<2+> or Mg<2+>, and NO<3-> or SO4<2+> or CH3COO<-> or PO4<3-> or Cl<->; the component B is glycerin or silicone oil or tung oil or vaseline or lanolin; and the component C is NaOH powder or Na2CO3 powder or ore powder. The preparation method comprises the following steps: mixing the component A and the component B, so that the surface of the component A is evenly coated with a layer of component B, and the component C is attached onto the surface of the component A through the component B to form coating particles; and screening, and cooling to obtain the environmental-protection self-snow-melting asphalt pavement admixture. When in use, the admixture is added into the asphalt mixture to be used on the asphalt pavement, thereby reducing the snow melting by salt sprinkling, solving the problems of environment pollution and waste of resources when the snow melting agent is used, effectively preventing the pavement from icing for a long time, lowering the pavement maintenance cost in winter, keeping the roads clear in snowy days, and reducing the incidence rate of traffic accidents.

The invention discloses a method for predicting residual service life of an asphalt pavement according to fatigue-modulus comprehensive performance of a core sample. The method comprises the following steps: boring a core and sampling at a typical disease position of an asphalt pavement; determining resilience modulus of the core sample under the action of dynamic loading; determining a deformation-cyclic loading frequency curve for a core sample fatigue test; modeling to predict the residual service life of the asphalt pavement. The method further comprises a step of combining with a temperature factor to obtain the practical life of the pavement, and further comprises a step of combining with a traffic factor to obtain the practical life of the pavement. According to the method provided by the invention, the viscoelastic property of an asphalt mixture is comprehensively considered; due to the dynamic loading action, the practical stress situation of the pavement is stimulated, the modulus of different positions is analyzed and compared, the residual service of the pavement is described by a fatigue curve, quantitative residual life prediction is provided for maintenance of an asphalt concrete pavement, and randomness of the selection on pavement maintenance time for a long time can be overcome.

The AirScene™ Pavement Management System of the present invention automatically tracks data required to determine various factors in an assessment of current and future pavement maintenance needs and utilizes this data to quantify the pavement damage caused by each individual aircraft movement and thus compute pavement condition based on an initial survey and the calculations of accrued damage over time. This information can be displayed through AirScene™ in the form of tables, graphs, or graphically represented on an airport diagram showing present conditions, rates of accruing damage, and future wear rates and areas. The system draws on the data from the AirScene™ Data Warehouse (ADW), a single repository for all the information acquired from a number of different sources. These data include: Aircraft or vehicle type (wheel layout, weight, vehicle specific parameters, and the like), Aircraft or vehicle location (ground track, position, gate used, and the like), Aircraft or vehicle dynamics (velocity, acceleration, take off, touchdown, and the like), Aircraft or vehicle actual weight (cargo load, fuel load, and the like), as well as Future operational data (flight schedules, increasing flight loads and demand, and the like).

The invention discloses a microwave heated and cured emulsified asphalt concrete material and a preparation method thereof. The emulsified asphalt concrete comprises the following components by mass: 79%-88% of basalt or limestone aggregate, 3%-6% of limestone mineral powder, 1%-4% of ordinary portland cement, 8%-11% of microwave heated and demulsified emulsified asphalt. The preparation method consists of the steps of: mixing the aggregate, mineral powder and cement at normal temperature for 1min, adding the microwave heated and demulsified special emulsified asphalt, and mixing the mixture for 2min, spreading out and pre-pressing the mixture to compactness of 50%, conducting microwave heating to a temperature above 50DEG C and implementing demulsification for draining, continuing heating the mixture to a temperature above 100DEG C, and carrying out final pressing, thus obtaining the concrete material. The method of the invention employs demulsification for draining after microwave heating as well as final pressing for curing, so that the demulsification time of the emulsified asphalt is controllable, and the pavement performance of the emulsified asphalt concrete is greatly improved. Being green and environmentally friendly as well as construction convenient, the method provided in the invention is suitable for application of the emulsified asphalt concrete to high-grade pavement layers, rapid pavement maintenance, asphalt concrete factory prefabrication, and other fields.

The invention discloses bridge pavement maintenance equipment. The bridge pavement maintenance equipment comprises a base plate, a cone frustum arranged on the base plate and a hopper arranged on the cone frustum, wherein corner columns are arranged at four corners at the bottom of the base plate, wheels are arranged at the bottoms of the corner columns, a handle is fixedly connected to the left end of the base plate, the top end face of the base plate is fixedly connected with the bottom end face of the hopper, the hopper comprises a first bucket part, a second bucket part and a third bucket part, the second bucket part is arranged at the bottom of the first bucket part, the third bucket part is arranged at the bottom of the second bucket part, a first accommodating cavity is arranged in the cone frustum, the top of the left side of the first accommodating cavity is provided with a first port communicated with the third bucket part, the bottom of the right side of the first accommodating cavity is provided with a second port, a second accommodating cavity is arranged in the cone frustum at the bottom of the second port, and a slide groove is arranged in the cone frustum at the bottom of the second accommodating cavity. The bridge pavement maintenance equipment is simple in structure, capable of achieving automatic control, convenient to operate, capable of reducing labor force and worker labor intensity, capable of automatically controlling stirring and discharge and high in cleanliness.

The embodiment of the invention discloses a pavement performance prediction and maintenance method and device based on maintenance history correction. The method is based on road conditions, traffic volume data and maintenance history data of a route over the years, and adopts a modeling idea of "model grouping, year-by-year accumulation and elimination of maintenance history influences, data update dynamic correction" to finally obtain a pavement performance decay model that is based on untreated actual road condition data over the years and considers traffic volume cumulative axle-load influences. The model established by the method not only can be used to accurately predict the natural attenuation index of road conditions of a pavement in future years, but also can be used to assist incalculating preventive maintenance benefits and judging the best maintenance time in the aspects of pavement maintenance planning and decision-making, and meanwhile, when performing multi-year planning, more scientific and reasonable maintenance schemes and plans can be formulated based on accurately predicted road condition attenuation values, and the reasonable forecast of pavement maintenance funds can be achieved.

The invention discloses a multifunctional asphalt pavement maintenance vehicle and belongs to the technical field of road maintenance and construction equipment. The multifunctional asphalt pavement maintenance vehicle comprises a vehicle chassis and further comprises an auxiliary power system (2), a direct combustion type fuel oil hot blast heater (3), a rotary stock bin (4), a feeding device (5), an asphalt pavement hot air type heating wall (6), an emulsified asphalt spraying system (7), a dust and smoke removing device (8), a hot asphalt spraying device, an auxiliary tool and a control system (9). All the devices are mounted on the vehicle so that the maintenance vehicle is multifunctional; ground surface heating type or patching type pit slot repairing can be realized; crack pouring repairing of a newly-built pavement, and spraying of emulsified asphalt or hot asphalt on a lower sealing layer, a sticking layer and an upper sealing layer of the partial newly-built pavement can also be considered; and a special maintenance tool is driven by hydraulic and power output so that the construction efficiency is effectively improved.

The invention provides a low-energy-consumption asphalt concrete pavement hot in-place recycling method to solve the problems existing in the pavement heating process of three heating machines in an existing hot in-place recycling technology, and belongs to the technical field of asphalt concrete pavement maintenance. The method includes the steps of pavement sweeping, guide line drawing, pavement heating, pavement milling and planing, regenerant and new asphalt adding, recycled mixture re-stirring and paving, pavement compaction, high-permeability asphalt spraying to seal a recycled pavement and the like. Two heating machines are adopted for heating the pavement in a gradient heating manner, and the phenomenon that the pavement is heated to be too hot under the condition that the temperature of the pavement is high in summer or in South China is avoided; and for a road section aging seriously, after hot recycling construction is finished, the service life of the pavement is prolonged in a high-permeability asphalt spraying manner.

The invention discloses a cement concrete pavement crack damage grooving type repair method. The repair method is characterized in that the method includes the following steps: traffic control, lofting and lining, cutting and grooving, anchoring steel nail and iron wire mesh installation, groove inside cleaning, concrete pavement pouring, concrete pavement maintenance, and control removal and traffic opening in order. The grooving type repair method is to groove a groove with the width being 20 cm and the depth being about half of the plate thickness, arrange anchoring steel nails and iron wire mesh in the groove, and pour micro-expansion concrete of the same strength grade as a conventional pavement into the groove to the level flushing with the pavement. The grooving repair method do notneed to break the whole pavement, thereby saving huge cost. The road closure scope during construction is small, thereby ensuring road smooth. The micro-expansion concrete can be used to make the joint between the concrete pavement poured during the repair and the conventional concrete pavement smaller and enhance the crack resistance of the repaired concrete.

The present invention discloses a pavement damage type identification method based on a classifier ensemble. The method comprises the following steps of: 1) performing homomorphic filter preprocessing on detected damaged pavement images; 2) establishing a pavement damage image database by using the preprocessed pavement images, and guaranteeing the balance of image samples in the database, namely, guaranteeing the images to be same in size and number, wherein the database comprises horizontal crack, longitudinal crack, net crack and precipitation damage types; 3) extracting eigenvectors of the pavement damage images by respectively using Contourlet conversion and edge direction histogram methods, and establishing union eigenvectors of the pavement damage images by using a serial combined policy; and 4) based on a cross kernel support vector machine, establishing a random subspace ensemble classifier to identify the pavement damage images. The pavement damage type identification method based on the classifier ensemble, provided by the present invention, effectively improves the efficiency of pavement damage image type identification,and provides an efficient and intelligent management basis for road management work, particularly pavement maintenance.

The invention discloses a municipal road asphalt concrete pavement maintenance structure. The municipal road asphalt concrete pavement maintenance structure comprises a trolley used for moving, a cleaning device arranged on the trolley and used for cleaning dust and impurities of a slot seam, a melting kettle used for heating and stirring the asphalt and a leveling device used for flattening and compacting the asphalt; the cleaning device comprises a dust collection assembly used for removing dust and removing impurities of the slot seam, a scrubbing assembly used for scrubbing the slot seam and a drying component used for drying the slot seam which are sequentially distributed along the X-axis direction; the melting kettle comprises a kettle body used for temporarily storing the asphalt, a kettle cover and a stirring assembly used for stirring the asphalt; and the leveling device comprises a plurality of flattening assemblies used for flattening the asphalt in the slot seam and a compaction assembly used for compacting the asphalt in the slot seam. The municipal road asphalt concrete pavement maintenance structure is specially designed for a highway pouring seam, and is reasonable in structure, good in pouring effect and high in repairing quality.

The present invention discloses a method for detecting pavement damage based on a joint detector. The method comprises the following steps of: 1) eliminating marking information of a pavement image by using gray constraint; 2) eliminating a shadow region of the pavement image by using a brightness elevation model; 3) performing preprocessing on the pavement image by using a wavelet thresholding method to eliminate noise in the pavement image; 4) constructing a pavement damage joint detector by using a neighborhood gray difference method, a local gray minimum analysis method and a block marking method, and performing damage detection on the preprocessed pavement image. and 5) locating a damaged region of the pavement image by using a target connected domain. The method for detecting pavement damage based on the joint detector, disclosed by the present invention, is used for improving the efficiency of pavement damage detection, and provides an efficient and intelligent management basis for road management work, particularly pavement maintenance.

The invention relates to a highway pavement condition detection system based on novel visual sensing equipment. The system comprises a controller and a plurality of roadside visual monitoring base stations which are connected with the controller and are arranged on the roadside of an expressway; each roadside visual monitoring base station comprises a visible light camera and an infrared camera, aprogram is carried in the controller, and when the controller executes the program: road surface anomaly detection: adopting a semantic classification network, capturing image data of local anomaly and diseases of a road surface, and detecting a classification result of abnormal conditions of the road surface; multi-element road section image splicing: collecting local road surface images captured by the visual monitoring base stations on each side, extracting feature vectors for matching, and realizing image splicing among different road sections; and multi-source image data fusion: analyzing the difference of overlapped parts of different road section images, and realizing transition fusion of the road section images through a fusion algorithm. Compared with the prior art, the method has the advantages that the anti-interference capability is high, the timeliness of pavement maintenance and management is improved, and the like.

The invention is related to a pavement construction technology in the direction of bridge engineering in the field of highway engineering, and discloses a construction method of a T-shaped girder bridge deck pavement by means of the heating principle of a graphene heating film. At present, thawing speed of snow on a bridge deck is increased by spreading a snow-melting agent usually, which occupies large amount of manpower and resources; and what is more, using the snow-melting agent for long time may cause corrosion on the bridge deck and bridge structure and further causes reduction of the service life of the bridge. The method includes the steps of: paving a reinforced concrete layer by 10 cm; 2) removing foreign matters from a bridge base layer; 3) paving the graphene heating film; 4) detecting heating performance of the graphene heating film; 5) paving a waterproof layer by 1 cm; 6) paving a cement concrete protective layer by 4 cm; 7) paving modified asphalt concrete by 5 cm; 8) testing ground surface temperature by an infrared temperature detector. The method solves problems of slow thawing speed of ice and water and corrosion on the bridge body due to the snow-melting agent after the T-shaped girder bridge pavement ices in winter. The method increases the service life of the T-shaped girder bridge pavement and reduces expenses of pavement maintenance and the snow-melting agent.

The invention belongs to the field of bituminous pavement maintenance of roads, and in particular relates to a flexible micro-surfacing sealing slurry mixture and a preparation method thereof. The flexible micro-surfacing sealing slurry mixture is characterized in that the mixture is prepared from the following materials in part by weight: 100 parts of aggregate, 2 to 4 parts of filling materials, 7 to 11 parts of water, 9 to 14 parts of SBR / FCC slurry oil compound modified emulsified asphalt and 1 to 3 parts of inorganic fiber, wherein the SBR / FCC slurry oil compound modified emulsified asphalt is prepared from the following materials in part by weight: 2 to 4 parts of styrene butadiene rubber (SBR), 5 to 15 parts of FCC slurry oil, 100 parts of matrix asphalt, 1.5 to 2.5 parts of cationic emulsifier, and 65 to 75 parts of the water. Asphalt pavement micro-surfacing sealing paved by using the flexible micro-surfacing sealing slurry mixture has high low-temperature anti-cracking performance.

The invention discloses a thermal insulation bunker on a bituminous pavement maintenance vehicle. The thermal insulation bunker comprises a V-shaped bituminous mixture bunker, a heat-conducting oil circulation heating system, an anti-caking device, a spiral transporting system and a material door opening mechanism. The main technology is to adopt a double heat source series cyclic heating mode of heating a heat-conducting oil fire-tube by a diesel-fired burner and electrically-heating a heat-conducting oil groove. By the double heat source series cyclic heating mode, heat-conducting oil temperature is detected and controlled by multiple points. The technology has advantages of high heat efficiency, uniform heating and strong adaptability. By the use of an elliptic heat-conducting oil coil arranged in an ''S'' shape, tube wall and bunker wall are in surface contact. Thus, heat exchange area is large, airtightness is good, and the difficulty that heating efficiency is low by line contact of a circular heat-conducting oil pipe and the bunker wall and heat-conducting oil is easy to leak when heated by the bunker outer lining heat-conducting oil groove is solved. The thermal insulation bunker has a good thermal insulation effect, and is energy-saving and efficient. By the anti-caking device for real-time stirring, a bituminous mixture is effectively prevented from being cooled, caked and separated. By supplementary stirring for discharging, discharging is continuous and fast, and there is no material-blocking phenomenon.

The invention relates to a road surface damage data space-time analysis method based on multi-source feature fusion, which comprises the following steps: road surface damage detection: capturing image data of local anomaly and disease of a road surface by adopting a semantic classification network, and detecting a classification result of an abnormal condition of the road surface; performing GPS positioning and video positioning space fusion of damage data, and establishing a global road surface coordinate system through a multivariate road section image splicing algorithm and by realizing multi-source image data fusion; tracing a damage data time sequence based on form matching, extracting road surface damage features under the time sequence, taking rough matching of spatial position features as a basis, and simultaneously matching high-frequency images acquired for multiple times; and constructing a natural pavement state high-frequency data set, including high-frequency lightweight pavement state data acquisition, multi-source data information extraction and fusion technology and data set interface establishment. Compared with the prior art, the invention has the advantages that the anti-interference capability is high, and the timeliness of pavement maintenance and management is improved.

The invention relates to a material for maintenance of tunnel asphalt pavement, in particular to a pavement maintenance mixture for solving the problems of organic flame retardance and environmental protection, belonging to the technical field of manufacture of road asphalt pavement materials. The mixture comprises the following components in percentage by weight: 71-86% of macadam, 6-10% of modified emulsified asphalt, 1-3% of padding, 1-2% of organic flame retardant, 1-2% of assistant and the balance water. The environment-friendly asphalt flame retardant is applied to micro-surfacing maintenance and treatment of the tunnel asphalt pavement, and the flame retardance of the micro-surfacing mixture is improved without changing each property of the micro-surfacing mixture for the pavement, thereby solving the problems of fire safety and environmental protection of the tunnel asphalt pavement. The formula can not influence various service properties of the original pavement and does not increase the construction difficulty. Thus, the environment-friendly flame-retardant micro-surfacing mixture for the tunnel has better popularization value and can better solve the problem of flame retardance of the tunnel asphalt pavement in the process of maintenance.

The invention discloses an ultra-viscous fiber resin asphalt wearing layer mixture and a preparation method thereof. The ultra-viscous fiber resin asphalt wearing layer mixture is prepared from the following raw materials in parts by weight: 2 to 10 parts of bisphenol-a epoxy resin, 6.5 to 8.5 parts of asphalt, 90 to 110 parts of minerals, 0.5 to 1.5 parts of a filler, 0.1 to 1 part of water and 0.01 to 0.2 part of fibers. The preparation method of the ultra-viscous fiber resin asphalt wearing layer mixture comprises the following steps: (1) firstly preparing resin asphalt: heating the asphalt to be 120 to 150 DEG C, adding the heated asphalt into a mixture A in the bisphenol-a epoxy resin, stirring for 10 to 20 min, then mixing and stirring the mixture A with a mixture B, so as to obtain the resin asphalt; (2) adding the minerals, the filler, the water and the fibers according to parts by weight, and blending the asphalt mixture under low temperature. Compared with a conventional preventive pavement maintenance micro-surface treatment technology, an ultra-viscous fiber resin asphalt wearing layer prepared from the mixture has obvious advantages.

The invention relates to the technical field of pavement maintenance equipment and discloses a pavement milling machine with a cleaning function. The pavement milling machine comprises a body and a rack, wherein a milling component extending to the bottom of the rack is fixedly inserted into the left side of the top of the rack; a rolling brush is rotationally connected to the bottom of the rack and positioned on the right side of the milling component; a motor connected with the rolling brush is fixedly connected to the top of the rack; and a coaming is fixedly connected to the bottom of therack and positioned on the outer side of the milling component and the rolling brush. According to the pavement milling machine with the cleaning function, chippings and dust produced by milling are crowded around by the coaming and a floating plate, the chippings are swept onto a transfer component by the rolling brush and then transferred into a waste tank, air containing lots of dust is dissociated by an exhaust fan, and the dust is filtered in a dust collection box by a filtering net. According to the manner, the pavement milling machine is capable of cleaning and collecting the chippingsand dust during operation, the environment and body health of operators can be protected, the working efficiency is improved, and the machine is convenient to use.

The invention discloses a method for determining optimum maintenance opportunities of pavements on basis of pavement performance models before and after maintenance. The method comprises the followingsteps of: determining two pavement performance decay models before and after maintenance according to performance detection indexes of a practical pavement maintenance project over the years, whereinthe performance detection indexes over the years comprise a flatness index IRI, a track depth RD and the like; establishing relationship between parameters of the two models, predicting a pavement performance model after the maintenance by using a pavement performance model before the maintenance, defining a maintenance benefit as enveloping areas between performance curves before and after the maintenance and a maintenance threshold value, and expressing the enveloping areas by functions of the parameters of the performance model before the maintenance; and finally, determining a value of acorresponding parameter when the maintenance benefit is the maximum so as to determine an optimum maintenance opportunity and providing important basis for road maintenance and management decisions. When the method is used for determining the optimum maintenance opportunity, an analysis period does not need to be determined in advance, so that the method has wide applicability.

The invention relates to an inorganic flame retardant-mixed micro-surfacing pavement maintenance material which is a material for an asphalt pavement of a tunnel, in particular to an asphalt pavement maintenance mixing material for solving the problem of inorganic flame retardancy, belonging to the technical field of preparation of an asphalt pavement material of a road. The mixing material comprises the following components by a mixing ratio range: 78-87 percent of broken stone, 6-10 percent of modified emulsifying asphalt, 0.5-2 percent of padding, 0.5-2 percent of inorganic flame retardant, 1-2 percent of auxiliary agent and the balance of water. By applying in the micro-surfacing maintenance of the asphalt pavement of the tunnel, the inorganic flame retardant effectively improves the flame retardancy of the asphalt pavement of the tunnel in the use process under the premise of not changing all road performances of the original micro-surfacing asphalt mixing material, thereby solving the problem of fire safety of the asphalt pavement of the tunnel. The prescription not only can not influence various use performances of the original pavement but also does not improve construction difficulty, therefore, the inorganic flame retardant-mixed micro-surfacing pavement maintenance material has more favorable popularization value in the asphalt pavement maintenance of the tunnel.