547 results about "Pitch blende" patented technology

The invention discloses an efficient preparation and construction optimization system and method for a cold patch asphalt mixture, and belongs to the technical field of construction optimization. Environmental parameters of a construction site are collected, including altitude, an air pressure correction coefficient and a light volatile factor, and a multi-scale mixture model coupled with air pressure response is constructed; analyzing the volatilization path, the structural stability and the initial bonding strength of the mixture in combination with discrete elements and fluid mechanics simulation, and further extracting a structural retention threshold value and reversely deducing the proportion adjustment amount of medium-high boiling point solvent components; meanwhile, a microcapsule controlled release technology is adopted to delay release of light components, adaptive construction parameters are output based on a simulation platform and a machine learning model, the paving temperature and the compaction frequency are dynamically optimized, and efficient cooperation and intelligent regulation and control of the cold patch material performance and the site construction technology are achieved.

The invention belongs to the technical field of engineering material detection, and particularly discloses an asphalt mixture dynamic water stability comprehensive detection system which comprises a standard test piece preparation module, a dynamic load loading module, a diffusion behavior analysis module, a sealing failure verification module and a water stability evaluation module. A detection area is limited through closed sealing treatment, a staged progressive increase dynamic load is applied to simulate an actual working condition, a three-dimensional moisture diffusion map is constructed to analyze diffusion behavior parameters, and a dynamic water stability grade evaluation result is generated in combination with an intelligent matching algorithm. According to the method, edge water seepage interference can be effectively avoided, the moisture diffusion process is accurately monitored, the performance of the asphalt mixture is comprehensively evaluated, and a scientific basis is provided for pavement structure design and material optimization.

The invention discloses an asphalt mixture component segmentation method, device and equipment, and relates to the technical field of asphalt pavement construction control, and the method comprises the steps: obtaining an initial two-dimensional image of an asphalt mixture section, and carrying out the preprocessing of the initial two-dimensional scanning image, and the preprocessing comprises the contrast enhancement and light field correction. Component division is carried out on the preprocessed image through a double-threshold segmentation method, morphological post-processing is carried out on the initial segmentation image, and each separated component segmentation image is obtained; and calculating the difference value between the image area ratio and the actual volume ratio of each component segmentation image, and calculating the relative error between the image screening grading and the actual screening grading of the aggregate components. When the difference value or the relative error exceeds the preset threshold range, the image processing parameters are adjusted, the segmentation operation is executed again, the target segmented image is obtained, the difference value and the relative error of the target segmented image are both within the preset threshold range, and the problem that the segmentation precision of the asphalt mixture components is insufficient is solved.

The invention provides an all-component multi-source solid waste asphalt mixture design method and system, and relates to the technical field of data processing, and the method comprises the steps: carrying out the preprocessing of obtained test proportion data of a solid waste asphalt mixture, and generating a mixture data set; screening the mixture data set by using a preset constraint condition to obtain a plurality of candidate matching points meeting the performance index characteristics; the performance index characteristics comprise gradation structure characteristics related to particle size, bonding system characteristics related to high-temperature fluidity and water sensitivity, molding volume and construction characteristics related to porosity and saturation, and context embedding characteristics related to a service scene; splicing the performance index features and inputting the spliced performance index features into a trained gating expert network to obtain a corresponding performance prediction mean value and a performance fluctuation mean value; and performing reliability analysis on the candidate matching points based on the performance prediction mean value and the performance fluctuation mean value, and determining the candidate matching points of which the reliability is greater than a preset threshold value as target matching points.

The invention belongs to the technical field of RAP recycled asphalt mixtures, and particularly relates to a high-dosage RAP recycled asphalt mixture for alpine regions and a preparation method of the high-dosage RAP recycled asphalt mixture. The high-dosage RAP recycled asphalt mixture for the alpine region is characterized by comprising the following components in percentage by mass: 50-60% of RAP, 3-6% of mineral powder, 1-3% of new asphalt, 1-2% of a composite regenerant, 1-2% of a modifier and the balance of a new aggregate, the composite regenerant is composed of pine tar, plant-based epoxy ester oil, cashew nut shell oil and a penetrant. The modifier is prepared from regenerated low-density polyvinyl chloride, hyperbranched epoxy resin and liquid polybutadiene rubber coated waste rubber powder. According to the technical scheme provided by the invention, the technical problems of poor low-temperature performance, water stability and freeze-thaw cycle stability when a high-dosage RAP recycled asphalt mixture is used in an alpine region are solved.

The invention discloses an early strength type modified emulsified asphalt mixture and a preparation method thereof, the content of each substance in the asphalt mixture is as follows: 70-80 wt% of aggregate, 8-12 wt% of SBS modified emulsified asphalt, 8-10 wt% of an early strength agent and 4-8 wt% of mineral powder, the addition amount of the early strength agent is increased along with the increase of the addition amount of the SBS modified emulsified asphalt, and the addition amount of the mineral powder is increased along with the increase of the addition amount of the SBS modified emulsified asphalt. When the addition amount of the SBS modified emulsified asphalt is increased by 1 wt%, the addition amount of the early strength agent is correspondingly increased by 0.4-0.6 wt%. The preparation method comprises the following steps: preparing SBS modified asphalt and preserving heat for later use; preparing SBS modified emulsified asphalt, and sealing and storing; preparing an early strength agent and storing at normal temperature for later use; the aggregate, the early strength agent and the mineral powder are put into a mixing pot to be stirred; and adding the SBS modified emulsified asphalt into the mixing pot, and continuously stirring to obtain the early-strength modified emulsified asphalt mixture. The emulsified asphalt mixture prepared by the invention has the advantages of high initial strength, quick strength increase, good pavement performance and the like, can be used for paving an upper surface layer of a high-grade pavement, and can quickly open traffic after paving.

The invention provides a method for analyzing and predicting the water stability of an asphalt mixture, which comprises the following steps of: acquiring multi-dimensional service environment, material composition and standard water stability test data, and carrying out standardization and stratified sampling division on the multi-dimensional service environment, the material composition and the standard water stability test data; a context sensing multi-layer perceptron network supporting feature parameter sharing and gradient accumulation is constructed, and the importance weight of each dimension of features under different data distributions is automatically evaluated and normalized. An attention mechanism and a graph convolutional network are introduced, association between features is quantified, and a key high-order interaction relationship is deduced; by means of K-fold cross validation and meta-learning optimization, the generalization ability of the model for new distribution data is improved, prediction accuracy and feature interpretation are improved, and intelligent analysis and proportion design of the water stability of the asphalt mixture are promoted.

The application provides a regenerative asphalt mixture prefabricated member forming device, which comprises a rotating disc mechanism, the rotating disc mechanism is provided with a rotating disc support, the upper end of the rotating disc support is rotationally provided with a bearing rotating disc, and at least six lower molds are arranged in a circumferential array on the bearing rotating disc; a support rack is arranged outside the rotating disc mechanism, and a distributing mechanism, a lower-pressing forming mechanism, an air-cooling cooling mechanism, a blanking and carrying mechanism, a lower mold cleaning mechanism and a release agent brushing mechanism corresponding to the lower molds are sequentially arranged on the support rack along the circumference of the bearing rotating disc; and the application can realize multi-station sequential and simultaneous processing, thereby improving the processing efficiency.

The invention relates to the technical field of pavement materials, and particularly discloses an all-solid waste asphalt mixture as well as a preparation method and application thereof. The all-solid waste asphalt mixture is prepared from the following raw material components: activated waste rubber powder, waste rubber powder modified emulsified asphalt, a waste asphalt-based pavement material, aggregate, a fiber material and an additive, wherein the aggregate comprises coal gangue powder, waste magnesia carbon brick powder, nut shell powder, coarse aggregate, steel slag powder and fine aggregate; the fiber material comprises activated aramid fiber and waste rubber powder modified glass fiber reinforced plastic fiber; the additive comprises a smoke suppression viscosity reducer and a styrene-butadiene-styrene block copolymer. The all-solid waste asphalt mixture with excellent pavement performance is prepared by utilizing the synergistic effect of all the component raw materials, and the problem that the pavement performance of an asphalt regenerated mixture is poor due to the fact that existing solid waste is poor in compatibility with other components when being applied to the asphalt regenerated mixture is effectively solved.

The invention provides a high-mixing-amount RAP recycled asphalt mixture design method based on a fine separation process, which is characterized in that based on the RAP fine separation process, an RAP material is treated through a grading stripping and high-frequency screening (frequency is greater than or equal to 25Hz) process, so that the grading variation coefficient is less than or equal to 6.59%, and the caking rate is less than or equal to 5.2%; the mass ratio of the coarse material to the fine material of the RAP is controlled to be 10: 2.5-10: 4.5, the reference value of the total mixing amount of the RAP is obtained through the equilibrium design (changing cross point) of an indoor performance test, and then the actual value of the total mixing amount of the RAP is determined through a correction formula. The invention further provides the high-mixing-amount RAP recycled asphalt mixture designed according to the design. According to the design method of the high-doping-amount RAP recycled asphalt mixture and the designed high-doping-amount RAP recycled asphalt mixture, the problem of collaborative optimization of the ratio of coarse and fine materials and the doping amount threshold value can be solved, and collaborative optimization of high doping amount and high performance can be achieved.

The invention relates to the field of old asphalt regeneration, in particular to an old asphalt mixture regeneration device and a regeneration process thereof.The old asphalt mixture regeneration device comprises a storage device used for storing materials, a fluidized bed drying system, a roller drying system, a stirring main machine and a dust removal system; the fluidized bed drying system is used for drying and metering small-particle-size asphaltic sand and comprises a feeding hopper, a fluidized bed, a first metering device and a first smoke exhaust device. The material storage device comprises a stock bin, a material overturning mechanism arranged in the middle of the stock bin and used for lifting and overturning materials and a discharging mechanism arranged at the lower end of the stock bin, an air inlet and an air outlet are formed in the two opposite side walls of the stock bin respectively, a feeding port and a discharging port are formed in the stock bin, and the discharging port is communicated with the discharging mechanism; and hot air circulating systems are arranged on the air inlet and the air outlet. The technical problem that asphaltic sand is easy to accumulate and adhere is solved.

The utility model discloses an asphalt mixture rut sample forming machine which comprises a carrying box body, a supporting frame fixedly connected to the carrying box body, a controller fixedly connected to the front end of the supporting frame, a test trolley located at the upper end of the carrying box body and located below the supporting frame, and a sample disc detachably connected to the test trolley. The upper end of the supporting frame is fixedly connected with an air cylinder. The output end of the air cylinder is detachably connected with a connecting frame. The lower end of the connecting frame is detachably connected with a grinding wheel; and the connecting frame is rotationally connected with a cleaning part for cleaning the lower surface of the runner wheel. Compared with the prior art, the cleaning device has the advantages that by arranging the cleaning scraper, after the rocking rod is rocked, the cleaning scraper moves along the radian direction of the lower surface of the runner wheel under the support of the connecting rod, so that the asphalt mixture adhered to the lower surface of the runner wheel is cleaned, and a heat insulation material is wound on the rocking rod, so that a worker is prevented from being scalded; the cleaning efficiency is improved, and the test completion time is shortened.

The invention relates to the technical field of asphalt mixtures, and particularly discloses a pavement asphalt mixture applied to an alpine region and a preparation method of the pavement asphalt mixture. According to the invention, the rubber powder modified asphalt is selected, the type of the coarse aggregate is limited to be steel slag, and the diatomite and the polyester fiber are also added as additives. Under the synergistic effect of the rubber powder modified asphalt, the steel slag and the additive, the asphalt mixture disclosed by the invention can overcome cracking stress generated under a low-temperature condition, so that low-temperature damage is effectively resisted, the low-temperature crack resistance of the asphalt mixture is improved, and the application requirements of a pavement structure in an alpine region can be fully met.

The invention provides recycled asphalt mixture stirring equipment, and belongs to the technical field of recycled asphalt mixture production. The recycled asphalt mixture stirring equipment comprises a support and a stirring cylinder fixedly connected to the interior of the support; a discharging opening is formed in the bottom of the stirring cylinder, driving mechanisms are arranged on the front side wall and the rear side wall of the stirring cylinder, an arc-shaped baffle matched with the discharging opening is arranged between the front driving mechanism and the rear driving mechanism which correspond to each other, and the driving mechanisms are used for driving the arc-shaped baffle to vertically move and then rotate along the axis of the inner arc face of the stirring cylinder to open the discharging opening. When the arc-shaped baffle is closed, the arc-shaped baffle is matched with the inner arc surface of the stirring cylinder to form a smooth curved surface, an auxiliary discharger is fixedly arranged on the outer arc surface of the stirring cylinder and used for assisting in discharging materials on the surface of the arc-shaped baffle when the arc-shaped baffle is opened, and connecting shafts are arranged on the left side and the right side of the discharging opening correspondingly; the outer arc surfaces of the connecting shafts are rotationally connected with connecting strips; the problem that the quality of the recycled asphalt mixture is affected due to the fact that discharging on the surface of the arc-shaped baffle is not thorough can be solved.

Disclosed in the present invention are a raw material composition for a steel slag-asphalt mixture, and a steel slag-asphalt mixture and the preparation and use thereof. The raw material composition for a steel slag-asphalt mixture comprises the following components in parts by mass: 100 parts of steel slag, 2-8 parts of a steel slag modifier, 20-40 parts of modified emulsified asphalt, and 3-8 parts of a surfactant, wherein the modified emulsified asphalt comprises the following components in parts by mass: 100 parts of matrix asphalt, 15-20 parts of EVA, 0.08-0.5 parts of a stabilizer, 1.5-5 parts of an emulsifier, and 0.5-2 parts of a defoaming agent. The operable time of the steel slag-asphalt mixture of the present invention is greatly prolonged; moreover, the curing time is shortened, and the strength after curing is maintained.

The invention provides an asphalt mixture aggregate uniformity analysis method and system based on a Thiessen polygon distribution rule. According to the asphalt mixture aggregate uniformity analysis method and system based on the Thiessen polygon distribution rule, the asphalt aggregate uniformity is analyzed, the aggregate distribution uniformity can be accurately quantified, and a local non-uniform area is detected; and a scientific basis is provided for optimization of the mix proportion of the asphalt mixture and adjustment of a construction process. Compared with a traditional manual detection method, the detection efficiency is improved, the detection precision is improved, subjectivity and errors are effectively reduced, and the high-precision and high-efficiency requirements of engineering practice on aggregate uniformity detection are met.

The invention provides a method for predicting the stability of a basalt fiber asphalt mixture, relates to the field of road engineering and intelligent prediction, and aims to optimize the mix proportion design process of the basalt fiber asphalt mixture and accurately predict the stability of the basalt fiber asphalt mixture. By combining feature engineering, regression algorithm comparison, model optimization and interpretability analysis, the mechanical property, the crack resistance and the high temperature resistance of the asphalt mixture are remarkably improved, and meanwhile, the dynamic optimization of the performance of the mixture under different use conditions is realized; according to the method, the problem of accurate prediction of the performance change of the asphalt mixture under different environmental conditions is solved through a more scientific, intelligent and adaptive novel mix proportion design thought, and the comprehensive performance of the asphalt mixture and the sustainability of road engineering are improved; based on the characteristics of the basalt fiber, the mix proportion of the asphalt mixture is optimized, the manual intervention and test times are reduced, and the design efficiency and accuracy are improved.

The invention discloses a preparation method of a nano silicon dioxide modified asphalt recycled fine aggregate plant-mixed hot recycled high-performance mixture, and belongs to the field of road engineering materials. The method specifically comprises the following steps: firstly, crushing and screening the waste asphalt mixture to obtain regenerated fine aggregate with the particle size of less than or equal to 2.36 mm, and activating the regenerated fine aggregate with a silane coupling agent KH-560; secondly, nano SiO2 with the particle size of 20-50 nm is subjected to ultrasonic dispersion and then modified with a silane coupling agent KH-570; mixing the aged asphalt and new asphalt according to a certain proportion, adding a proper amount of regenerant and modified nano SiO2, and carrying out shear modification treatment; and finally, mixing the modified recycled fine aggregate, the new coarse aggregate and the new mineral powder according to the target gradation, and fully mixing with the nano-modified recycled asphalt to obtain the mixture. The interface bonding performance of the recycled fine aggregate and asphalt is remarkably improved through dual modification, the problems that a traditional recycled mixture is poor in durability and insufficient in high-temperature stability are solved, and the high-performance mixture is prepared.

The invention relates to the technical field of road engineering materials, and particularly discloses a composite fiber modified asphalt mixture and a preparation method thereof. The composite fiber modified asphalt mixture comprises the following raw materials: asphalt, composite fibers, aggregate and mineral powder, wherein the composite fibers comprise aramid fibers and alkali-treated bamboo fibers. According to the composite fiber modified asphalt mixture provided by the invention, the aramid fibers and the alkali-treated bamboo fibers are synergistically compounded, so that the high-temperature stability, the low-temperature crack resistance, the water damage resistance and other properties of the asphalt mixture are comprehensively improved.

The utility model provides an auxiliary feeding device and an asphalt mixture mixer, and relates to the technical field of waste asphalt mixture regeneration stirring, the auxiliary feeding device comprises a lifting platform, a pressurizing mechanism and a conveying mechanism, the lifting platform is provided with a filling mechanism; the pressurizing mechanism comprises an air cylinder, an execution element and an air conveying pipe, the air conveying pipe communicates with the air cylinder and the filling mechanism, the execution element is connected with the lifting table, and air in the air cylinder is pressurized and conveyed into the filling structure through movement of the execution element; the conveying mechanism communicates with the filling mechanism. The device has the advantages of being simple in structure, convenient to operate and more uniform in regenerant dispersion, a power system does not need to be additionally arranged, and uniform spraying of the regenerant in the mixing process of the regenerated mixture can be achieved; the problem that the performance of the indoor regenerated mixture cannot accurately reflect the performance of the regenerated mixture in the mixing station due to the fact that the difference between the adding mode of the regenerant and the adding mode of the mixing station is too large in the indoor test is solved.

The invention relates to the technical field of recycled asphalt, in particular to a high-consumption RAP fine aggregate recycled asphalt mixture and a preparation method thereof.The high-consumption RAP fine aggregate recycled asphalt mixture is prepared from, by weight, 30-50 parts of RAP fine aggregate, 10-30 parts of RAP coarse aggregate, 25-30 parts of new coarse aggregate, 4-5.2 parts of matrix asphalt, 3-5 parts of cold additive recycled rubber cement, 3-5 parts of mineral powder and 0.2-0.26 part of warm mixing agent. When the total doping amount of the RAP is 60%, the proportion of the fine materials in the total RAP is larger than or equal to 50%, the fine materials can be stably doped, the discarding rate and energy consumption of the fine materials are remarkably reduced, and the RAP fine materials can be consumed in a high proportion.

The utility model discloses road asphalt mixture temperature monitoring equipment, and belongs to the technical field of asphalt mixture monitoring. Comprising a guide pipe, the bottom end of the guide pipe is fixedly connected with a moving seat, a sliding pipe is slidably installed in the guide pipe, the bottom end of the sliding pipe is sleeved with a threaded rod in a threaded mode, the threaded rod movably penetrates through the guide pipe and is fixedly connected with a wobble plate, an L-shaped sliding rod is slidably inserted in the sliding pipe, and a probe is installed on the L-shaped sliding rod in a threaded mode. A soil-shaped seat is fixedly arranged outside the guide pipe, a ruler plate is slidably mounted on the soil-shaped seat, an electronic temperature measuring instrument is fixed on the soil-shaped seat through a bolt thread, and a cable is electrically connected between the electronic temperature measuring instrument and the probe; the monitoring device can be used for monitoring the temperature of the asphalt mixture on the upper layer of the carriage of the special transport vehicle for the road asphalt mixture, the insertion depth and the insertion position of the probe can be conveniently regulated and controlled, and the temperature monitoring of the asphalt mixture at multiple points of the carriage is realized.

The application relates to a drainage asphalt mixture grading design method based on a single particle size main skeleton concept, which comprises the following steps: selecting raw materials; adding 6mm, 8mm and 11mm screen meshes to finely divide coarse aggregate particle size subintervals; designing coarse aggregate grading, selecting single particle size coarse aggregates with different particle size subinterval proportions to construct a coarse aggregate main skeleton structure; proposing a particle size distribution index, calculating the particle size distribution index corresponding to the single particle size coarse aggregates with different particle size subinterval proportions; designing fine aggregate grading; adopting a coarse aggregate void filling method to determine asphalt content and coarse and fine aggregate ratios; forming test pieces to conduct mechanical property verification tests and drainage performance evaluation tests; and taking the particle size distribution index value to guide coarse aggregate grading design. The coarse aggregate main skeleton structure has good embedding and extruding capacity and internal friction resistance, the mixture prepared by optimizing grading has the characteristics of good skid resistance and strong drainage performance, and the rain environment high-speed driving safety can be significantly improved.

The invention relates to the technical field of combustor test, and discloses a test platform for an asphalt mixture equipment combustor, the test platform comprises a base, a test platform hearth, a hybrid demisting tower and a first induced draft fan, the upper end of the base is provided with a combustor, and the output end of the combustor is connected with the test platform hearth; the air outlet end of the test platform hearth is connected with the hybrid demisting tower and the detection pipeline, the air outlet end of the hybrid demisting tower is connected with the first induced draft fan, the hybrid demisting tower comprises a tower frame, a spraying mechanism and a first water pump, the tower frame is provided with a water tank, the upper end of the tower frame is provided with a demisting cavity, the side wall of the water tank is provided with an air inlet, and the upper end of the demisting cavity is provided with an air outlet; a communicating pipe is arranged between the water tank and the demisting cavity, a rotational flow plate is arranged in the communicating pipe, the first water pump is installed on the side wall of the water tank, the spraying mechanism is arranged in the demisting cavity, and the first water pump is connected with the spraying mechanism. According to the invention, generated waste gas is subjected to four-stage treatment of rotational flow, spraying, filtering and centrifugal demisting, and is discharged after reaching the standard through a tail end fan.

This invention discloses an asphalt mixture transfer and metering device for a traction trolley used for slope paving. It includes an upper platform on the trolley, with a cantilever beam load cell fixedly installed at the upper end of the platform. A supporting frame is fixedly installed on the cantilever beam load cell, and a transfer hopper is fixedly installed on the supporting frame. A discharge port is provided through the lower end of the transfer hopper, and a support plate is fixedly connected to the lower end of the hopper. A connecting plate is rotatably connected to the support plate via a rotating shaft, and a sealing plate is fixedly connected to the lower end of the connecting plate. This device, through structural optimization and functional integration, comprehensively improves construction efficiency, paving quality, and control precision. The transfer hopper buffers materials, eliminating "waiting for materials and stopping the machine," and reducing scheduling difficulty. Dual temperature control maintains the optimal temperature of the mixture, avoiding construction defects. The cantilever beam load cell can measure and precisely discharge materials in real time, controlling the amount used as needed to ensure uniform paving and accurate material usage, meeting the construction standards for high-grade asphalt pavement.

The application discloses an evaluation method for the coordinated deformation behavior of an embedded sensor and asphalt mixture, and there is no specification and accurate evaluation method for the coordinated deformation behavior of the embedded sensor and the asphalt mixture at present. The evaluation method is used for obtaining the tire action times corresponding to the cracking of an asphalt mixture rut test piece, the tire action times corresponding to the sensor misalignment node, and the tire action times corresponding to the sensor failure node as evolution evaluation indexes, and the coordinated deformation behavior between the sensor and the mixture is calculated and evaluated by using the three evolution evaluation indexes. The application can obtain the service life of the embedded sensor intelligent sensing structure under different load sizes and loading frequencies, is beneficial to subsequent determination of the best embedding process, embedding position of the sensor and mixture mix design matched with the deformation of the sensor or other related key parameters, and provides accurate data support for the design of a long-service-life and high-precision intelligent road embedded sensing system.

This disclosure relates to a non-volatile room-temperature modified asphalt binder, a non-volatile room-temperature recycled asphalt mixture containing the same, and a method for repairing potholes and cracks using the same. [Solution] A non-volatile, room-temperature recycled asphalt mixture according to one embodiment has the advantages of improved fluidity, prevention of conventional asphalt cracking, improved peeling, and enhanced thermal stability.

The present application relates to the technical field of asphalt extraction, and relates to a separation experiment device for determining the gradation of modified asphalt mixture, which comprises a water tank, the top surface of which is open; a storage tank, which is arranged on the inner side of the water tank and has a gap between the inner wall of the water tank, the inside of the storage tank is provided with a stirring assembly, the outer side wall of the storage tank is provided with an ultrasonic assembly and a discharge port, the discharge port is provided with a filter screen, the inner side wall of the water tank is provided with a baffle, the position of the baffle corresponds to that of the filter screen; a rotary positioner, which is arranged above the water tank and has an output end connected to the top of the storage tank. The storage tank has a spherical structure, and comprises a first shell and a second shell, the first shell and the second shell are detachably connected. In use, the ultrasonic assembly and the storage tank are connected together and can move synchronously, so that the operation steps are simplified, the ultrasonic assembly and the storage tank will not collide, and the service life of the device is prolonged.

The invention provides a hierarchical mixture design index and optimization method according to functional requirements of different pavement layers (a surface layer, a middle surface layer and a lower surface layer) in combination with climate zoning and traffic load characteristics. According to the method, key mechanical parameters (the dynamic stability of a surface layer is greater than or equal to 6000 times / mm, and the low-temperature bending strain of a lower surface layer is greater than or equal to 2500 mu epsilon) are determined according to the horizon function, and then the mineral aggregate gradation and the special asphalt dosage are optimized through coupling analysis of volume parameters (the void ratio is 3%-5%, and the mineral aggregate void ratio is greater than or equal to 17%) and mechanical properties. And meanwhile, a bonding layer interface shear strength test (greater than or equal to 1.2 MPa) is introduced, so that the structural integrity is ensured.

This invention discloses a method and equipment for evaluating the tensile toughness of recycled asphalt mixtures, relating to the field of analytical techniques for recycled asphalt mixtures. The method includes: acquiring variables related to the internal structure and external environment of the recycled asphalt mixture to be evaluated; the variables related to the internal structure include: internal structural state variables, the length of the aggregate-binder two-phase interface transition zone, and the elastic modulus; the variables related to the external environment include: tensile strain ratio, loading frequency, and dynamic modulus; and calculating the tensile toughness evaluation value of the cold recycled asphalt mixture based on a predetermined multi-parameter coupling relationship using the variables related to the internal structure and the external environment. This invention introduces environmental factors and internal structural parameters of the recycled asphalt mixture to establish a multi-parameter tensile toughness evaluation model, fully considering the material composition, microstructural distribution characteristics, load factors, and ambient temperature of the recycled asphalt mixture under stress in the structural layer, enabling accurate evaluation of the tensile toughness of the recycled asphalt mixture.