Construction system and process of flowing mucilage asphalt mixture

Abstract

The invention discloses a construction system and process for a flowing mucilage asphalt mixture, and the system is characterized in that the mixing temperature T DEG C of a mixing unit is determined by the equal viscosity temperature corresponding to the mucilage viscosity 0.5 Pa.s, a transportation unit comprises a box body and a cylinder body which divides the box body into a thermal medium chamber and a storage chamber, the storage chamber is provided with a feeding port, a discharging port and a rotatable discharging device, and the discharging port is provided with a discharging port. A turnover device and a conveying device are arranged in the storage chamber, a heating element and a first temperature sensor are arranged in the thermal medium chamber, a second temperature sensor is arranged in the storage chamber, the operation unit is connected with the discharging device in a matched mode, the initial pressing temperature of the rolling unit is T-10-T + 10 DEG C, and the re-pressing temperature of the rolling unit is larger than or equal to T-20 DEG C. The process comprises the steps of mixing, transporting, operating and rolling. Through precise temperature control, continuous stirring, rotatable discharging and high-temperature rolling, the problems of segregation and accumulation caused by high fluidity of FMA mucilage are solved, framework-ultra-dense structure forming is achieved, the quality of a pavement is improved, and the service life of the pavement is prolonged.

Description

Technical Field

[0001] This invention relates to the field of road construction technology, specifically to a construction system and process for a flowable asphalt mixture. Background Technology

[0002] Over the past four decades, my country's highway infrastructure has achieved leapfrog development. By the end of 2024, the total length of highways nationwide exceeded 5.4904 million kilometers, with the expressway network ranking first in the world at 190,700 kilometers. In the field of asphalt pavement technology, my country has established a modified asphalt technology system with independent intellectual property rights and has made significant progress in mixture design theory and structural analysis methods. However, industry statistics show that 60% of my country's expressways require major or medium-scale repairs after 10-12 years of use, and 17% after 6-8 years. This situation highlights the core technical challenge of insufficient durability of current asphalt pavements. This problem not only leads to high life-cycle costs for asphalt pavements but also disrupts traffic due to frequent maintenance, reducing road capacity and service levels, and placing enormous pressure on pavement material resources and the environment.

[0003] Tracing back to its origins, the current hot-mix asphalt (HMA) system is based on the theoretical foundation of "viscous mortar (non-leaking)," which has long dominated its research and development direction, limiting the space for optimization of asphalt mixture materials and improvement of durability. Current HMA design methods all follow this requirement to meet construction processes. Due to the "viscous mortar (non-leaking)" characteristic of HMA, its construction process uses ordinary transport vehicles, and the mortar does not leak during transportation, allowing for a temperature loss of about 20°C during transportation and paving. Rolling and forming generally adopts a combination of light steel wheel rollers (initial compaction), heavy steel wheel rollers (secondary compaction), heavy pneumatic tire rollers (optional), and light steel wheel rollers (final compaction).

[0004] Based on the common characteristic of "viscous binder (non-leakage)," conflicts exist among the various properties of HMA, making it difficult to increase the amount of asphalt used and limiting measures to improve gradation. This has led to a long-term focus of HMA research on asphalt binder performance and modification. Simultaneously, to ensure rutting resistance, a relatively large void ratio (typically 4%) needs to be designed. Coupled with segregation and insufficient compaction, the local void ratio can reach 6% to 8% or more. These factors make it difficult to comprehensively improve the overall performance of HMA, resulting in an inability to balance performance across different areas. Furthermore, issues such as construction segregation lead to early pavement distress, limiting the improvement of HMA pavement durability.

[0005] Existing technologies have proposed theories and design methods for fluidized asphalt mixtures (FMA). Fluidized asphalt mixtures refer to skeleton-ultra-dense asphalt mixtures formed by filling the gaps in the asphalt skeleton with highly fluid asphalt slurry through its own flow or vibration-assisted compaction techniques, resulting in an internal porosity close to zero. During construction, due to the flow of the slurry, FMA, while possessing rutting resistance, allows for increased and significantly adjustable asphalt content, forming a skeleton-ultra-dense structure with an internal "zero" porosity. This structure helps solve problems such as water damage, fatigue cracking, reflective cracking, aging, and surface skid durability, and is expected to extend the service life of asphalt pavements.

[0006] Compared to the current HMA system's requirement for "viscous mortar (non-segregating)," FMA requires the mortar to have sufficient fluidity during paving and compaction. If the current HMA construction process is used, FMA will experience segregation, leading to uneven distribution. Furthermore, temperature drops during transportation may cause insufficient mortar fluidity during compaction, making it impossible to achieve "zero" voids and even resulting in insufficient rutting resistance.

[0007] Therefore, how to develop a construction system and process that is compatible with the material properties of flowable asphalt mixture (FMA) is an urgent problem that needs to be solved. Summary of the Invention

[0008] To address the technical problems existing in the prior art, the first objective of this invention is to provide a construction system for fluidized asphalt mortar mixtures. This system employs temperature-controlled mixing and transportation, a rotatable unloading device connected to the work unit, and high-temperature compaction. Through a separation structure between the heat medium chamber and the storage chamber, an intelligent temperature control system consisting of dual temperature sensors and a controller, and an upper and lower arranged turning and conveying device, the system ensures that the FMA mixture maintains a uniform mortar coating and precise temperature control during transportation. It also prevents material accumulation during operation and achieves stable skeleton formation during compaction. This solves the problems of leakage, segregation, temperature loss, and insufficient compaction caused by the mismatch between the current HMA construction process and the high fluidity characteristics of FMA.

[0009] The second objective of this invention is to provide a construction process for fluidized asphalt mortar (FMA) mixtures. This process employs temperature-controlled mixing and transportation to ensure the fluidity of the FMA mixture, resulting in uniform mortar coating of particles and consistent discharge. It eliminates the paver hopper, allowing direct connection between the unloading and paving devices, preventing material accumulation and pauses during paving. High-temperature compaction of the FMA is performed at near-mixing temperatures, increasing the compaction temperature by 20-30°C compared to current high-mold asphalt (HMA) construction methods. Utilizing the FMA skeleton's non-shifting characteristic at high temperatures, seamless integration of initial compaction and paving is achieved. High-temperature compaction improves compaction efficiency, allowing for single-pass thicknesses exceeding 20cm, ensuring the formation of a "skeleton-ultra-dense" structure, enhancing asphalt pavement quality, and significantly extending pavement life.

[0010] To achieve the above objectives, the present invention adopts the following technical solution: A construction system for a flowable asphalt mixture includes: The mixing unit is used to prepare coarse and fine aggregates, asphalt and fillers according to the gradation curve and composition parameters of the flowable asphalt mixture. The mixing temperature T℃ of the mixing unit is determined by the isoviscous temperature corresponding to a viscosity of 0.5 Pa·s in the asphalt mixture. The transport unit includes a mobile device and a box disposed on the upper part of the mobile device. A cylindrical body is disposed inside the box, and the cylindrical body divides the space inside the box into a heat medium chamber and a storage chamber. The upper part of the storage chamber is provided with a feed inlet, and the rear end wall of the storage chamber is provided with a discharge outlet, wherein the discharge outlet is provided with a rotatable unloading device. The storage chamber is equipped with a turning device and a conveying device arranged vertically. The turning device is used to maintain the uniform coating state of the fluidized asphalt mixture, and the conveying device is used to transport the fluidized asphalt mixture to the discharge port. The heat medium chamber is provided with a medium inlet and a medium outlet. The heat medium chamber is provided with a heating element and a first temperature sensor. The storage chamber is provided with a second temperature sensor. The heating element, the first temperature sensor and the second temperature sensor are used to control the temperature of the mixture within the range of T-10~T+10℃ during transportation. The work unit is connected to the unloading device of the transport unit and is used to receive the fluidized asphalt mixture and perform paving or repair operations. The compaction unit is used to compact the fluidized asphalt mixture after paving or repair. The initial compaction temperature of the compaction unit is controlled at T-10~T+10℃, and the secondary compaction temperature is ≥T-20℃.

[0011] According to one example, the tumbling device includes a pair of rotating shafts extending along the length of the storage chamber, the two ends of the rotating shafts being rotatably disposed at the two ends of the storage chamber, and the outer walls of the rotating shafts being provided with a plurality of tumbling blades along their length. The conveying device is a screw conveyor, which includes a main shaft and helical blades fixed on the main shaft. The main shaft is supported on the end wall of the lower part of the storage chamber, and one end of the main shaft is provided with a power input component, while the other end extends to the discharge port.

[0012] According to one example, the unloading device includes a unloading valve disposed at the discharge port, a base fixed to the upper part of the moving device, a rotating column rotatably disposed on the base, and an inclined plate disposed at the upper end of the rotating column. The unloading valve is used to control the unloading of the flowing asphalt mixture, and the inclined plate is located below the discharge port to receive and guide the unloaded mixture. The rotating column can drive the inclined plate to rotate between a retracted position and an extended position.

[0013] According to one example, the working unit is a paving device, which includes a frame, a auger distributor disposed on the front side of the frame, and a screed disposed on the rear side of the frame. The auger distributor is connected to the unloading device for receiving the flowing asphalt mixture, and the screed is used to vibrate and level the paved flowing asphalt mixture.

[0014] According to one example, the transport unit further includes a controller disposed on the mobile device, the controller being electrically connected to the first temperature sensor, the second temperature sensor, the heating element, the tumbling device, and the conveying device, respectively.

[0015] According to one example, the compaction unit includes a steel-wheeled vibratory roller and a rubber-tired roller, and the compaction unit is configured to first compact with the steel-wheeled vibratory roller and then compact with the rubber-tired roller.

[0016] A construction process for fluidized asphalt mixture using a construction system includes the following steps: In the mixing process, the mixing unit is used to prepare coarse and fine aggregates, asphalt and fillers according to the gradation curve of the flowing mortar asphalt mixture. Dry mixing is carried out for 30~45s, wet mixing for 10~15s, and the mixing temperature T℃ is determined by the isoviscosity temperature corresponding to the mortar viscosity of 0.5Pa·s. In the transportation process, the flowable asphalt mixture is transported using the aforementioned transportation unit. During transportation, the temperature is detected by the first and second temperature sensors, and the heating element is controlled by the controller to maintain the temperature of the flowable asphalt mixture within the range of T-10 to T+10℃. The heat preservation transportation time is ≤180min. During transportation, the mixture is continuously turned over by the turning device, and the flowable asphalt mixture is transported to the discharge port by the conveying device. The transportation follows the principle of "mixing and transportation, intelligent temperature control," using a dedicated mixing and transportation vehicle equipped with heating and heat preservation, continuous mixing, and intelligent temperature control systems, with the temperature controlled within (T-10 to T+10)℃. The heat preservation time from discharge to completion of paving should be controlled within 3 hours.

[0017] The work process involves unloading the fluidized asphalt mixture from the transport unit into the work unit via the unloading device for paving or repair work. The compaction process is carried out immediately after paving or repair, using the compaction unit. The initial compaction temperature is controlled at T-10~T+10℃, the secondary compaction temperature is ≥T-20℃, and compaction is carried out until the skeleton is stably formed.

[0018] According to one example, in the compaction process, a steel-wheeled vibratory roller is first used for compaction, followed by a rubber-tired roller.

[0019] According to one example, the construction thickness of the fluidized asphalt mixture in a single paving and compaction is 2 to 20 cm.

[0020] According to one example, the process also includes testing procedures, such as using a mixture screening method to test the fluidity of the asphalt mixture and using a combustion test to quantitatively sample and check the asphalt-aggregate ratio.

[0021] The present invention has the following advantages: This invention addresses the technical problems of segregation, leakage, temperature loss, and insufficient compaction caused by the mismatch between existing hot-mix asphalt (HMA) construction techniques and the high fluidity characteristics of flowable asphalt mixtures. It provides a dedicated construction system and process adapted to the properties of FMA materials. During transportation, this invention employs a dedicated transportation unit equipped with heating and insulation, continuous stirring, and intelligent temperature control systems. Through a separation structure between the heat medium chamber and storage chamber, real-time monitoring by dual temperature sensors, and centralized control by a controller, the mixture temperature is precisely controlled within the range of T ± 10℃. Simultaneously, continuous agitation by a turning device maintains uniform coating of the particles with the mortar. This effectively solves the problems of insufficient mortar fluidity caused by temperature drop during traditional transportation and uneven mixture distribution due to segregation during static setting, ensuring that the mixture maintains optimal fluidity and uniformity upon arrival at the construction site.

[0022] In repair operations, this invention features a rotatable unloading device at the discharge port, including an unloading valve, a base, a rotating column, and an inclined plate. During repair work, the inclined plate can be rotated to the extended position, allowing the mixture to directly fill the area to be repaired. This prevents the mixture from piling up or accumulating during transport, effectively preventing mortar enrichment and unevenness. Compared to traditional repair methods, this simplifies the work process and improves on-site construction efficiency. In paving operations, this invention uses a paving device that removes the hopper, allowing the auger distributor to directly connect with the unloading device of the transport unit. After the mixture is discharged from the discharge port, it slides down the inclined plate directly into the auger distributor, without passing through an intermediate hopper. This strictly adheres to the principle of no piling up or lingering of the mixture, effectively avoiding the problem of uneven mortar leakage caused by the accumulation and lingering of the mixture in the hopper of traditional pavers. It also reduces temperature loss in intermediate stages, ensuring that the mixture maintains sufficient fluidity and uniformity during paving.

[0023] In the compaction process, this invention fully utilizes the high-temperature non-displacement characteristic of FMA (Fiber Aggregate Mixture). Compaction is carried out immediately after paving while the aggregate is still hot, with the initial compaction temperature controlled at T±10℃, which is 20-30℃ higher than the current HMA (High-Mount Aggregate Mixture) process. A compaction method is adopted, first using steel wheel belt vibration, then rubber wheel kneading. Vibratory compaction causes the coarse aggregate to interlock and form a stable skeleton, while rubber wheel kneading ensures the mortar fully fills the gaps in the skeleton, ultimately forming a skeleton-ultra-dense structure with near-zero internal porosity and a textured surface. This effectively eliminates compaction-type rutting and instability-type rutting deformation that may occur during subsequent road use.

[0024] In summary, this invention, through the coordinated operation of mixing, transportation, operation, compaction, and testing processes, fully leverages the performance advantages of FMA, achieves synergistic molding of the mortar and the framework, eliminates the contradictions between the road performance of FMA after molding, significantly improves engineering efficiency and pavement construction quality, and effectively extends the service life of the pavement, providing standardized technical support for the large-scale engineering application of FMA. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the construction system for the fluidized asphalt mixture of the present invention.

[0026] Figure 2 This is a three-dimensional structural diagram of the transport unit of the present invention.

[0027] Figure 3 This is a three-dimensional structural diagram of the transport unit of the present invention from another angle.

[0028] Figure 4 This is a three-dimensional structural diagram of the container of the transport unit of the present invention.

[0029] Figure 5 This is a three-dimensional sectional view of the transport unit of the present invention.

[0030] Figure 6 This is a three-dimensional enlarged view of the unloading device of the transport unit of the present invention.

[0031] Figure 7 This is a schematic diagram of the construction process of the fluidized asphalt mixture of the present invention.

[0032] Figure 8 This is a viscosity-temperature curve of SHV high-viscosity modified asphalt mastic with different powder-to-binder ratios according to the present invention.

[0033] Figure 9 These are actual images of core samples taken on-site after construction using the construction method of this invention.

[0034] In this system, A is the mixing unit, B is the transportation unit, 1 is the moving device, 101 is the flat plate, 102 is the wheel, 2 is the box body, 2a is the hot medium chamber, 2b is the storage chamber, 201 is the medium inlet, 202 is the medium outlet, 203 is the support plate, 204 is the maintenance port, 3 is the cylinder body, 301 is the feed inlet, 302 is the discharge outlet, 303 is the turning device, 303a is the rotating shaft, 303b is the turning blade, 303c is the power input component, 304 is the conveying device, 304a is the main shaft, 304b is the spiral blade, 304c is the power input component, 4 is the unloading device, 401 is the unloading valve, 402 is the base, 403 is the rotating column, 404 is the inclined plate, 5 is the controller, C is the working unit, and D is the compaction unit. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0036] Reference Figure 1 This paper illustrates a specific embodiment of a construction system for flowable asphalt mixtures (FMA). The construction system is designed for the material properties of FMA and includes, in sequence, a mixing unit A, a transportation unit B, a working unit C, and a compaction unit D along the construction process flow. The mixing unit A is used to prepare the mixture according to the design gradation and determine the mixing temperature. The transportation unit B is used to heat and insulate the mixture, continuously stir and control the temperature during transportation to ensure that the mixture remains in a uniform flow state when it arrives at the work site. The working unit C is used to receive the mixture and perform paving or repair operations. The compaction unit D is used to compact the paved or repaired mixture into shape, ultimately forming a skeleton-ultra-dense structure.

[0037] Among them, fluidized asphalt mixture refers to a mixture characterized by highly fluidized asphalt slurry, which fills the gaps in the coarse aggregate skeleton through techniques such as the slurry's own flow or vibration-assisted compaction, resulting in an internal porosity close to zero after molding. The material properties of fluidized asphalt mixture dictate that it has special requirements for temperature control, segregation prevention, and compaction processes during construction. The construction system of this invention is specifically designed to meet these requirements.

[0038] In one embodiment, mixing unit A is used to prepare coarse and fine aggregates, asphalt, and fillers according to the gradation curve and composition parameters of the flowing asphalt mixture. Mixing unit A can be a conventional intermittent forced mixing equipment in the art, such as including a cold aggregate feeder, a drying drum, a hot aggregate elevator, a vibrating screen, a hot aggregate bin, a metering device, and a mixing pot connected sequentially along the material flow direction. The cold aggregate feeder is used to convey cold aggregates to the drying drum according to a set ratio. The drying drum is used to heat and dry the cold aggregates and convey them to the hot aggregate elevator. The hot aggregate elevator is used to lift the hot aggregates to the vibrating screen. The vibrating screen is used to classify and screen the hot aggregates according to particle size and store them separately in the compartments of the hot aggregate bin. The metering device is used to accurately weigh the aggregates, asphalt, and fillers in the hot aggregate bin. The mixing pot is used to mix and stir the weighed components to produce a uniform flowing asphalt mixture. During construction, coarse and fine aggregates are fed proportionally to a drying drum via a cold feeder for heating and drying. They are then conveyed by a hot feed elevator to a vibrating screen for grading and screening. The aggregates are stored in hot aggregate bins according to the designed gradation. A metering device weighs each grade of hot aggregate, asphalt, and filler according to the composition parameters, and these are then added to a mixing pot for dry mixing for 30-45 seconds and wet mixing for 10-15 seconds. The mixing temperature T℃ of mixing unit A is determined by the isoviscous temperature corresponding to a mortar viscosity of 0.5 Pa·s, ensuring that the mortar maintains suitable fluidity throughout subsequent transportation, operation, and compaction processes, achieving a skeleton-ultra-dense structure.

[0039] In another embodiment, mixing unit A may also employ a continuous drum mixer, which includes a cold aggregate feeding device, a drying mixing drum, an asphalt supply system, and a filler supply system. The cold aggregate feeding device continuously feeds cold aggregate into the drying mixing drum according to the designed gradation. Asphalt and filler are simultaneously and continuously metered and added. The drying, heating, and mixing processes are completed simultaneously within the drum, and the mixture is continuously discharged to produce a flowable asphalt-mortar mixture.

[0040] Reference Figure 2-5 This illustrates a preferred embodiment of transport unit B. Transport unit B includes a moving device 1 and a housing 2 disposed on the upper part of the moving device 1. The moving device 1 includes a horizontally arranged flat plate 101 and a plurality of wheels 102 disposed at the bottom of the flat plate 101. Figure 2 and Figure 3The X direction shown is the direction of travel of the mobile device 1. The front end of the flat plate 101 is used to dock with traction equipment such as the tractor head to realize the movement of the whole vehicle.

[0041] The box 2 has a hollow rectangular structure and extends along the length (X direction) of the flat plate 101. Inside the box 2 is a hollow, sealed cylinder 3, whose shape is approximately the same as that of the box 2. The cylinder 3 is fixedly connected to the inner wall of the box 2 by multiple reinforcing ribs. The cylinder 3 divides the space inside the box 2 into two relatively independent areas: an inner and an outer chamber. The inner space of the cylinder 3 forms a storage chamber 2b for containing the flowing asphalt mixture, and the annular space between the cylinder 3 and the box 2 forms a heat transfer medium chamber 2a for containing the heat transfer medium. This arrangement allows for uniform heating of the storage chamber 2b by the heat transfer medium chamber 2a while ensuring that the heat transfer medium is isolated from the mixture, avoiding direct contact.

[0042] A feed inlet 301 is provided at the upper part of storage chamber 2b. The feed inlet 301 extends upward through the heat medium chamber 2a and to the top of the box body 2, for receiving the flowing asphalt mixture from mixing unit A. A discharge outlet 302 is provided on the rear wall of storage chamber 2b. The discharge outlet 302 extends outward through the rear wall of the heat medium chamber 2a, and its end bends downward to facilitate unloading with subsequent operation unit C. Sealing rings or sealing fillers are provided at the locations where the feed inlet 301 and discharge outlet 302 penetrate the box body 2 to ensure the airtightness of the box body 2.

[0043] The heat medium chamber 2a is provided with a medium inlet 201 and a medium outlet 202 for the circulation of the heat transfer medium. The medium inlet 201 is located at the upper part of the heat medium chamber 2a, and the medium outlet 202 is located at the lower part of the heat medium chamber 2a, so that the medium flows from top to bottom, which is conducive to uniform heat transfer.

[0044] A heating element (not shown in the figure) is installed in the heat medium chamber 2a to heat the heat-conducting medium. The heating element can be a conventional heating method such as an electric heating tube, heating wire, or electromagnetic heating coil, as long as it can heat the heat-conducting medium. A first temperature sensor is also installed in the heat medium chamber 2a to detect the temperature of the heat-conducting medium, and a second temperature sensor is installed in the storage chamber 2b to detect the actual temperature of the flowing asphalt mixture. The heating element, the first temperature sensor, and the second temperature sensor work together to accurately control the mixture temperature within the range of T-10 to T+10℃ during transportation. Specifically, the second temperature sensor uses the mixture temperature as the primary control parameter, while the first temperature sensor uses the heat medium temperature as an auxiliary control parameter. Their combined action prevents overheating or underheating, ensuring that the mixture maintains a suitable flow state throughout the entire transportation process.

[0045] In one embodiment, a support plate 203 is provided at the bottom of the enclosure 2, which creates a certain gap between the bottom of the enclosure 2 and the flat plate 101 of the mobile device 1 for arranging pipes or cables, and also facilitates heat dissipation or insulation at the bottom of the enclosure 2. An inspection port 204 is also provided at the top of the enclosure 2, allowing operators to enter the enclosure 2 for maintenance and cleaning.

[0046] Reference Figure 5 A turning device 303 is installed in the storage chamber 2b to continuously turn the flowing asphalt mixture to maintain the uniform distribution of the components in the mixture, prevent segregation, and ensure that the surface of the aggregate particles is always uniformly coated with slurry. The turning device 303 includes a pair of rotating shafts 303a, which extend parallel to each other along the length of the storage chamber 2b and are arranged horizontally side by side. The two ends of each rotating shaft 303a are rotatably mounted on the two end walls of the storage chamber 2b. One end of the rotating shaft 303a passes through the end wall of the storage chamber 2b and the end wall of the heat medium chamber 2a in sequence, and extends to the outside of the box body 2, where it is rotatably supported on the outer wall of the box body 2 by bearings. The other end of the rotating shaft 303a passes through the end wall of the storage chamber 2b near the discharge port 302 and is rotatably supported on the outside of the end wall of the storage chamber 2b by bearings. The end of the rotating shaft 303a away from the discharge port 302 (i.e. the end extending out of the outer side of the housing 2) is equipped with a power input component 303c. The power input component 303c is a drive motor, which is fixedly installed on the outer wall of the housing 2 and connected to the rotating shaft 303a through a coupling to drive the rotating shaft 303a to rotate.

[0047] Multiple agitator blades 303b are arranged along the length of the outer wall of the rotating shaft 303a. These blades extend radially outward from the outer wall of the rotating shaft 303a and are used to agitate the mixture during rotation. The agitator blades 303b are straight blades without any twist angle to reduce rotational resistance, achieve agitation, and avoid damaging the gradation of the mixture. The multiple agitator blades 303b are arranged in groups along the length of the rotating shaft 303a, with every four blades forming a group of agitator components. The four blades 303b in the same group are evenly distributed around the circumference of the rotating shaft 303a. The included angle between two adjacent blades 303b is preferably 90°, but can be set to other angles according to actual agitation requirements. Adjacent groups of agitator components are arranged at certain intervals along the length of the rotating shaft 303a, and this interval can be adjusted according to the viscosity and flowability of the mixture.

[0048] Among them, the tumbling components on a pair of rotating shafts 303a are arranged in an alternating manner, that is, the tumbling component on one rotating shaft 303a is located in the interval area between two adjacent sets of tumbling components on the other rotating shaft 303a. This arrangement allows the tumbling blades 303b on the two rotating shafts 303a to cooperate with each other during rotation, ensuring that the mixture in each area of ​​the storage chamber 2b can be fully agitated.

[0049] With the addition of the turning device 303, the FMA mixture can be continuously and evenly turned over throughout the transportation process, effectively preventing aggregates from sinking and mortar from floating, and ensuring that the mixture remains uniformly coated with mortar when it arrives at the construction site.

[0050] In an embodiment not shown, a sealing element is provided at the position where the rotating shaft 303a passes through the end wall of the storage chamber 2b and the end wall of the heat medium chamber 2a. The sealing element can be in the form of a skeleton oil seal, a mechanical seal or a packing seal, and is installed on the inner side of the end wall of the storage chamber 2b and / or the outer side of the end wall of the heat medium chamber 2a, respectively, so as to achieve effective sealing between the storage chamber 2b and the heat medium chamber 2a.

[0051] Continue to refer to Figure 5 The storage chamber 2b is equipped with a conveying device 304, which is used to convey the flowing asphalt mixture to the discharge port 302. The turning device 303 and the conveying device 304 are arranged vertically. The turning device 303 is located at the upper part of the storage chamber 2b and is used to turn and stir the mixture. The conveying device 304 is located at the bottom of the storage chamber 2b and is used to directionally convey the turned mixture to the discharge port 302, thus realizing the turning and conveying.

[0052] The conveying device 304 is a screw conveyor, which includes a main shaft 304a and a screw blade 304b fixed on the main shaft 304a. The main shaft 304a extends along the length of the storage chamber 2b, and its two ends are rotatably disposed at both ends of the storage chamber 2b.

[0053] One end of the main shaft 304a, away from the discharge port 302, passes through the end wall of the storage chamber 2b and the end wall of the heat medium chamber 2a in sequence, and extends to the outside of the housing 2. It is rotatably supported on the outer wall of the housing 2 by bearings. The other end of the main shaft 304a, near the discharge port 302, passes through the end wall of the storage chamber 2b and is rotatably supported on the outside of the end wall of the storage chamber 2b by bearings. A power input component 304c, which is a drive motor, is provided at the end of the main shaft 304a away from the discharge port 302. The power input component 304c is fixedly installed on the outer wall of the housing 2 and connected to the main shaft 304a through a coupling to drive the main shaft 304a to rotate.

[0054] A spiral blade 304b is provided on the outer wall of the main shaft 304a. The spiral blade 304b extends continuously along the spiral direction of the main shaft 304a. When the main shaft 304a rotates, the spiral blade 304b pushes the mixture to move axially, gradually conveying the mixture from the far end to the near end of the storage chamber 2b. The discharge end of the main shaft 304a extends to the end wall of the storage chamber 2b near the discharge port 302, and is connected to the discharge port 302, which extends horizontally and bends downward from the rear end wall of the storage chamber 2b. This allows the mixture pushed to the near end to directly enter the inlet of the discharge port 302 and flow out smoothly along the curved channel.

[0055] By coordinating the vertical arrangement of the turning device 303 and the conveying device 304, only the turning device 303 works continuously during transportation to turn the mixture over to prevent segregation and ensure that the aggregate is evenly coated with slurry. When the material arrives at the construction site for unloading, the turning device 303 remains in operation while the conveying device 304 is activated to directionally convey the turned mixture to the discharge port 302, ensuring that the mixture can flow out smoothly and evenly during unloading.

[0056] In an embodiment not shown, a seal is provided at the location where the main shaft 304a passes through the end wall of the storage chamber 2b and the end wall of the heat medium chamber 2a. The seal can be in the form of a skeleton oil seal, a mechanical seal or a packing seal, and is installed on the inner side of the end wall of the storage chamber 2b and / or the outer side of the end wall of the heat medium chamber 2a, respectively, to prevent leakage of the mixture or mutual penetration of the heat transfer medium.

[0057] In one embodiment, the transport unit B further includes a controller 5 for intelligent control and automated management of the transport process. The controller 5 is mounted on the mobile device 1, preferably on the outer wall of the housing 2 or on the flat plate 101 of the mobile device 1. The controller 5 is electrically connected to the first temperature sensor, the second temperature sensor, the heating element, the turning device 303, and the conveying device 304. The controller 5 can be a programmable controller, industrial control computer, or microcontroller, as is commonly used in the art.

[0058] The controller 5 is electrically connected to the first temperature sensor to receive the temperature signal of the heat-conducting medium in the heat medium chamber 2a in real time. The controller 5 is also electrically connected to the second temperature sensor to receive the temperature signal of the flowing asphalt mixture in the storage chamber 2b in real time. The controller 5 uses the mixture temperature detected by the second temperature sensor as the main control target and the heat medium temperature detected by the first temperature sensor as the auxiliary control parameter to generate control commands according to the preset control algorithm.

[0059] The controller 5 is electrically connected to the heating element and is used to control the start / stop or power adjustment of the heating element according to the above control instructions, thereby adjusting the temperature of the heat transfer medium in the heat medium chamber 2a, and indirectly controlling the temperature of the mixture in the storage chamber 2b, so as to ensure that the mixture remains stable within the set range of T-10~T+10℃ throughout the entire transportation process.

[0060] The controller 5 is electrically connected to the power input component 303c of the turning device 303, and is used to control the start / stop, speed, and operating mode of the turning device 303. During transportation, the controller 5 controls the turning device 303 to operate continuously, turning the mixture continuously to prevent aggregate from sinking and slurry from floating. The controller 5 is also electrically connected to the power input component 304c of the conveying device 304, and is used to control the start / stop and speed of the conveying device 304. During transportation, the controller 5 controls the conveying device 304 to be in a stopped state to prevent the mixture from being pushed to the discharge port 302 prematurely. When the mixture arrives at the construction site for unloading, the controller 5 starts the conveying device 304 and adjusts its speed according to the unloading speed requirements, while keeping the turning device 303 running continuously, realizing the coordinated work of turning and conveying to ensure that the mixture can flow out smoothly and evenly. In a preferred embodiment, when the transportation time exceeds a preset threshold and no unloading operation is performed, the controller 5 starts the conveyor 304 to rotate forward for a certain period of time at regular intervals, and then immediately reverses to rotate in the same direction, causing slight disturbance to the bottom mixture, breaking up any possible static accumulation layer, and ensuring that the mixture as a whole is not pushed to the discharge port 302. When unloading is carried out at the construction site, the controller 5 switches to continuous conveying mode, so that the conveyor 304 continues to rotate forward, smoothly conveying the mixture to the discharge port 302. Through the centralized control of the controller 5, temperature detection, heating regulation, agitation and mixing, and conveying and unloading can be coordinated to ensure the temperature stability and uniformity of the FMA mixture during transportation, and to achieve efficient and smooth discharge during unloading.

[0061] Reference Figure 2 and Figure 6The discharge port 302 is equipped with a rotatable unloading device 4 for unloading the flowing asphalt mixture from the transport unit B and guiding it to the operating unit C. The unloading device 4 includes a unloading valve 401, a base 402, a rotating column 403, and an inclined plate 404. The unloading valve 401 is located at the discharge port 302 and controls the unloading of the flowing asphalt mixture. In one embodiment, the unloading valve 401 includes two symmetrically arranged arc-shaped petals connected in an openable manner, forming a bucket-shaped space. The upper end of each arc-shaped petal is rotatably connected to the side edge of the discharge port 302. A handle is provided on the outer side of each arc-shaped petal, allowing the operator to control the opening and closing degree of the two arc-shaped petals by operating the handle. By adjusting the opening angle of the handle, the opening degree of the unloading valve 401 can be controlled, thereby regulating the flow rate of the mixture being unloaded. Of course, the discharge valve 401 can be a gate valve or butterfly valve, which are conventional in this field, and the discharge flow rate of the mixture can be controlled by opening or closing it.

[0062] The base 402 is fixed to the upper part of the mobile device 1, specifically mounted on the flat plate 101 of the mobile device 1 near the discharge port 302. The rotating column 403 is rotatably mounted on the base 402 via bearings. The axis of the rotating column 403 is arranged vertically, allowing it to rotate in the horizontal plane around its axis. An inclined plate 404 is fixedly mounted on the upper end of the rotating column 403. The inclined plate 404 is located below the discharge port 302, with its inlet end corresponding to the discharge end of the discharge port 302. It is used to receive the mixture discharged from the discharge port 302 and guide it along the inclined plate 404 to the subsequent working unit C.

[0063] The rotating column 403 can drive the inclined plate 404 to rotate between a retracted position and an extended position. The retracted position is defined as the inclined plate 404 retracting to a position close to the transport unit B, and the extended position is defined as the inclined plate 404 extending to a position away from the transport unit B. The outlet end of the inclined plate 404 is aligned with the receiving port of the working unit C for easy unloading. In addition, the length of the rotating column 403 can be configured according to actual needs.

[0064] In addition, the rotation of the inclined plate 404 can be driven manually or electrically. In one embodiment, a handle is provided on the outer side of the inclined plate 404. The operator can pull the handle to make the inclined plate 404 rotate around the rotating column 403, thereby switching the inclined plate 404 between the retracted position and the extended position.

[0065] In an embodiment not shown, a locking component is also provided at the storage position to limit and lock the inclined plate 404. For example, the locking component includes a retaining ring, a retaining hole, and a pin. The retaining ring is fixedly disposed on the side of the inclined plate 404, and the retaining hole is correspondingly disposed on the flat plate 101 of the moving device 1, located directly below the retaining ring when the inclined plate 404 is rotated to the storage position. When the inclined plate 404 is rotated to the storage position, the retaining ring and the retaining hole are aligned vertically. The operator then passes the pin through the retaining ring and the retaining hole in sequence to lock the inclined plate 404 in the storage position, preventing it from loosening or rotating due to vibration during transportation. Of course, the locking component can also be in the form of a buckle or a spring-loaded locking plate.

[0066] In one embodiment, the working unit C is connected to the unloading device 4 of the transport unit B to receive the fluidized asphalt mixture and perform paving or repair work. For example, the working unit C is a paving device, which includes a frame, a auger distributor located at the front of the frame, and a screed located at the rear of the frame. The auger distributor is connected to the unloading device 4 to receive the fluidized asphalt mixture, and the screed is used to vibrate and level the paved fluidized asphalt mixture. The paving device does not need to be equipped with a paving hopper to avoid the mixture from accumulating and remaining in the paver hopper, thereby preventing uneven separation of the mortar and reducing the fluidity of the mortar due to temperature loss.

[0067] The paving device includes a frame, a auger distributor, and a screed. The frame serves as the supporting foundation for the paving device, and its lower part is equipped with a traveling mechanism, allowing the paving device to move autonomously along the construction direction. The auger distributor is located on the front side of the frame, extending laterally, and is used to evenly distribute the received mixture across the paving width. The screed is located on the rear side of the frame and is hinged to the frame via a traction arm. It can float up and down on the paving surface, and is used for preliminary compaction and leveling of the distributed mixture.

[0068] The auger distributor is connected to the unloading device 4 of transport unit B to receive the flowing asphalt mixture discharged from the unloading device 4. The paving device is configured to remove the hopper of a conventional paver, so that the inlet 301 of the auger distributor directly corresponds to the outlet end of the unloading device 4. When the inclined plate 404 of the unloading device 4 rotates to the extended position, its outlet end is exactly above the auger distributor, and the mixture slides down the inclined plate 404 directly into the auger distributor without passing through the intermediate hopper. By removing the hopper to achieve direct connection between the auger distributor and the unloading device 4, the mixture can be prevented from accumulating and remaining in the hopper of a conventional paver, thereby effectively preventing uneven precipitation caused by the enrichment of the asphalt slurry. At the same time, it reduces the temperature loss of the mixture in the intermediate stage, ensuring that the mixture maintains sufficient fluidity and uniformity during paving. It should be noted that the specific structure of the paving device described above is only an exemplary embodiment of the present invention. Any other structural forms that can be directly connected with the unloading device 4 to receive the mixture and carry out paving operations should be regarded as equivalent to the technical solutions in this embodiment.

[0069] In one embodiment, compaction unit D is used to compact the fluidized asphalt mixture after paving or repair work, thereby densifying it. The operating temperature of compaction unit D needs to be controlled according to the material properties of FMA, with the initial compaction temperature controlled within the range of T-10~T+10℃ and the secondary compaction temperature ≥T-20℃, to ensure that the mortar maintains sufficient fluidity during compaction, fully filling the gaps in the aggregate, while avoiding asphalt aging due to excessively high temperatures or insufficient compaction due to excessively low temperatures.

[0070] Compaction unit D includes a steel-wheeled vibratory roller and a rubber-tired roller. Compaction unit D is configured to first use the steel-wheeled vibratory roller for compaction, followed by the rubber-tired roller. Immediately after paving or repair, the steel-wheeled vibratory roller is started for initial and secondary compaction. The steel-wheeled vibratory roller utilizes the static weight and vibration of its steel wheels to apply significant compaction energy to the mixture, forcing the coarse aggregates to interlock and form a stable skeleton structure. Because FMA (fiber-modified aggregate) does not shift at high temperatures, it can be directly vibrated and compacted at temperatures close to the mixing temperature, without waiting for the mixture to cool down, achieving a seamless transition between initial compaction and paving. After the steel-wheeled vibratory roller completes the secondary compaction, the rubber-tired roller is used for kneading compaction. The rubber-tired roller, through the kneading action of its rubber tires, evenly squeezes the surface and internal rubber slurry into the skeleton gaps, ensuring the slurry fully fills the voids while eliminating surface wheel tracks, forming a dense and smooth paving layer. The kneading action of the rubber-tired roller further promotes the coating of the rubber slurry and aggregate, improving the integrity and durability of the mixture. The compaction temperature of compaction unit D is 20-30℃ higher than that of the current hot-mix asphalt mixture construction process, making full use of the high-temperature non-displacement characteristic of FMA, improving compaction efficiency, and achieving a single-pass thickness of 2-20cm, effectively shortening the construction cycle and reducing construction costs.

[0071] Reference Figure 7 This application also provides a construction process for a fluidized bed asphalt mixture using a construction system, comprising the following steps: S1. Mixing process Raw material preparation and testing: The mixing process begins with the preparation and testing of raw materials. In this embodiment, limestone is used for both coarse and fine aggregates, SBS modified asphalt is used for asphalt, and mineral powder obtained by grinding limestone aggregate is used as filler. All raw materials must undergo index testing according to relevant standards before entering the site, and can only be used after all test results are qualified.

[0072] Determination of mixing temperature: The apparent viscosity of SHV high-viscosity modified asphalt mastic with different powder-to-binder ratios was measured at different temperatures using a Blockfield viscometer, and viscosity-temperature curves were plotted as follows: Figure 8 As shown. Figure 8 The viscosity-temperature curves of SHV asphalt mortar with powder-to-binder ratios of 1.5, 1.0, and 0.5, as well as the SHV high-viscosity modified asphalt itself, are shown. The test results indicate that when the mortar viscosity is ≤0.5 Pa·s, the mortar flowability requirements for FMA mixture paving construction are met. Further experimental verification and preliminary construction verification show that when the mortar viscosity is around 0.5 Pa·s, the mortar has suitable flowability and can fully fill the skeleton voids during paving and compaction, forming a skeleton-ultra-dense structure. Therefore, in the construction system of this invention, the isoviscous temperature corresponding to a mortar viscosity of 0.5 Pa·s is used as the control benchmark for the mixing temperature T℃. Figure 8 The viscosity-temperature curve shows that when the viscosity is 0.5 Pa·s, the corresponding temperature is approximately 190℃. Therefore, in this embodiment, T=190℃ is taken. The mixing temperature of mixing unit A is controlled within the range of T±10℃, i.e., 190~200℃, to ensure that the mortar maintains suitable fluidity in subsequent processes. When conditions permit, the construction temperature can be appropriately increased, but it must be controlled within a reasonable range to avoid asphalt aging.

[0073] Mixture preparation and mixing: According to the FMA gradation curve and mixture composition parameters, weigh out the coarse and fine aggregates, asphalt and filler respectively. Pour the weighed coarse and fine aggregates and filler into the mixing pot in sequence for dry mixing. The dry mixing time is 30~45s to make the aggregates and fillers initially mixed evenly. Then add the weighed asphalt for wet mixing. The wet mixing time is 10~15s to make the asphalt evenly coat the surface of the aggregate particles.

[0074] Mixing quality requirements: After mixing, the quality of the mixture should be inspected. Qualified FMA mixture should meet the following requirements: the surface of all aggregate particles is evenly coated with asphalt mortar, the mixture is black and shiny, the mortar has obvious fluidity, and there is no separation of aggregate and mortar. If uneven mixing or segregation occurs, the mixing parameters should be adjusted or the quality of raw materials should be checked until the above requirements are met before the mixture can be discharged.

[0075] S2, Transportation Process Transportation equipment: The transportation process uses a dedicated mixer truck as transportation unit B. Transportation unit B includes a mobile device 1 and a box 2 located on the upper part of the mobile device 1. A cylinder 3 is installed inside the box 2, which divides the space inside the box 2 into a heat medium chamber 2a and a storage chamber 2b. A heating element and a first temperature sensor are installed in the heat medium chamber 2a. A second temperature sensor, a turning device 303, and a conveying device 304 are installed in the storage chamber 2b. Transportation unit B is also equipped with a controller 5, which is electrically connected to the first temperature sensor, the second temperature sensor, the heating element, the turning device 303, and the conveying device 304, respectively, to realize intelligent control of the transportation process.

[0076] Loading and Transportation: The mixed asphalt slurry is unloaded from mixing unit A and loaded into storage chamber 2b through inlet 301 at the top of storage chamber 2b. After loading, transportation unit B proceeds to the construction site. During transportation, controller 5 controls the heating element to start / stop or adjust its power based on the detection signals from the first and second temperature sensors, precisely controlling the mixture temperature within the range of T-10 to T+10℃. In this embodiment, T=190℃, meaning the temperature is controlled between 180 and 200℃. Simultaneously, controller 5 controls the turning device 303 to operate continuously, constantly turning the mixture to prevent aggregates from sinking and slurry from floating, ensuring uniform slurry coating on particles. Conveying device 304 remains stopped during transportation to prevent the mixture from being prematurely pushed to outlet 302.

[0077] Transportation time control: The transportation time should be controlled within 180 minutes. Excessive high-temperature mixing time will cause asphalt components to age, weaken the tensile deformation capacity of the mixture, and shorten its service life. Therefore, the transportation route and time should be planned reasonably to ensure that the mixture arrives at the construction site in the best condition.

[0078] Requirements for unloading: After transport unit B arrives at the construction site, the condition of the mixture should be checked before unloading. Qualified FMA mixture should meet the following requirements: the mixture is uniform and consistent, with a glossy black color, and the mortar has obvious fluidity. There is no separation of aggregates and mortar. If segregation or insufficient fluidity occurs, the cause should be checked and the transport parameters adjusted.

[0079] Continuous paving: When carrying out large-scale paving operations, the number of transport units B should be reasonably arranged according to the paving speed to ensure that there are always transport vehicles waiting to unload in front of the paving equipment at the construction site, so as to achieve continuous paving operations and avoid downtime or paving interruption caused by waiting for unloading.

[0080] S3, Work Procedure Unloading Preparation: After transport unit B arrives at the construction site, it enters the work process. At this time, controller 5 starts the conveying device 304 to transport the uniformly flowing asphalt mixture, which has been continuously agitated by the turning device 303 in storage chamber 2b, to the discharge port 302. Simultaneously, according to the work requirements, the operator rotates the inclined plate 404 of the unloading device 4 to the extended position, ready to connect with work unit C.

[0081] Paving Operation: During large-scale paving operations, work unit C is the paving device, which is configured to remove the hopper of a conventional paver. Its auger distributor is directly connected to the unloading device 4 of transport unit B. After the mixture is discharged from the outlet 302 of transport unit B, it slides down the inclined plate 404 and directly enters the auger distributor without passing through the intermediate hopper, following the principle of no piling up and no stagnation of the mixture.

[0082] During the paving process, transport unit B moves synchronously with the paving device. Specifically, transport unit B is driven by a tractor and reverses to the front of the paving device, so that the outlet end of the inclined plate 404 of the unloading device 4 is above the auger distributor. After docking, the paving device starts and moves along the construction direction at a set speed. At the same time, transport unit B, driven by the tractor, follows at the same speed, ensuring that the unloading device 4 and the auger distributor remain docked at all times. During this process, controller 5 controls the conveying device 304 to operate continuously, continuously conveying the mixture to the outlet 302, achieving uninterrupted paving operation.

[0083] During the paving operation, the paving device moves continuously at a constant speed of 0.8~2m / min, with fluctuations controlled within ±0.3m / min. The rotation speed of the auger distributor is linked to the moving speed to ensure uniform distribution of the mixture across the entire paving width. The screed width is 2.5~4.5m, with tight joints and a maximum joint width not exceeding 10m to prevent mortar segregation. The screed is equipped with vibrators and tampers, with a vibration frequency controlled at 280~320 times / min and a tamping frequency controlled at 90~110 times / min, used for initial compaction and leveling of the paved layer. Once a transport unit B is emptied of its mixture, it leaves the construction site, and simultaneously, the next transport unit B fully loaded with mixture is positioned, repeating the docking and synchronous movement process to ensure the continuity of the paving operation. By removing the hopper and directly connecting the auger distributor with the unloading device 4, the accumulation and retention of the mixture in the hopper of the traditional paver can be effectively avoided, thereby preventing uneven precipitation caused by the enrichment of the adhesive. At the same time, the temperature loss of the mixture in the intermediate stage is reduced, ensuring that the mixture maintains sufficient fluidity and uniformity during paving.

[0084] Repair Operation: When performing localized repairs, the unloading device 4 is used directly for repairs, eliminating the need for additional repair equipment. The operator rotates the inclined plate 404 of the unloading device 4 to the extended position, aligning its outlet directly with the pit or crack to be repaired. By controlling the opening and closing of the unloading valve 401 and the rotation speed of the conveying device 304, the mixture is evenly filled into the repair area. After filling, the operator performs simple manual leveling. Using the rotatable unloading device 4 for direct repair work avoids the mixture piling up during transport, preventing mortar enrichment and unevenness, while simplifying the repair process and improving on-site construction efficiency.

[0085] S4, Compaction Process Compaction Principles and Temperature Control: The compaction process follows the principle of compacting at high temperatures until the skeleton is stable. Due to the unique skeleton structure of FMA, it possesses non-displacement characteristics during high-temperature compaction. Therefore, compaction should be carried out immediately after paving or repair while the temperature is still high to achieve a seamless connection between initial compaction and paving. The initial compaction temperature of compaction unit D is controlled within the range of T-10~T+10℃, which is approximately 180~200℃ in this embodiment, 20~30℃ higher than the initial compaction temperature of current hot-mix asphalt mixture construction technology. The secondary compaction temperature is ≥T-20℃, which is ≥170℃ in this embodiment. The final compaction temperature can be determined according to the actual site conditions and generally does not need to be strictly controlled within a specific range.

[0086] Compaction Method and Sequence: Compaction Unit D includes a steel-wheeled vibratory roller and a rubber-tired roller. First, the steel-wheeled vibratory roller is used for initial and secondary compaction. The steel-wheeled roller utilizes the static weight and vibration of its steel wheels to apply significant compaction energy to the high-temperature FMA mixture, forcing the coarse aggregates to interlock and form a stable skeleton structure. At this point, due to the non-dumping characteristic of FMA at high temperatures, vibratory compaction can be performed directly at temperatures close to the mixing temperature, without waiting for the mixture to cool down, thus improving compaction efficiency and effect. After the secondary compaction by the steel-wheeled vibratory roller, the rubber-tired roller is immediately used for kneading compaction. The rubber-tired roller, through the kneading action of its rubber tires, evenly squeezes the surface and internal rubber paste into the skeleton gaps, ensuring the rubber paste fully fills the voids and eliminating surface wheel tracks, forming a dense and smooth pavement. Depending on the actual site conditions, a light steel-wheeled roller can be selected for final compaction and leveling to further eliminate wheel tracks and improve road surface smoothness.

[0087] Compaction mechanism: Vibratory compaction first stabilizes the skeleton, and rubber-tired roller compaction fully fills the grout. The two do not interfere with each other but cooperate with each other. During the compaction process, the FMA skeleton is formed by vibration compaction at high temperature. After the skeleton is compacted, the interior of the FMA remains at a high temperature. The grout, relying on its own fluidity and combined with the vibration assistance of the roller, can fully flow and fill the gaps in the skeleton, ultimately forming a skeleton with a near-zero internal porosity and a surface with structural depth - an ultra-dense structure. This forming method can effectively eliminate compaction-type rutting and unstable rutting deformation that may occur on the road surface during subsequent traffic use.

[0088] Quality control and adjustment: During and after compaction, the quality of the paving layer should be inspected. If localized oil bleeding or non-compliance with filling requirements occurs, rework measures should be taken while the layer is still hot, such as additional compaction or local patching. If systemic oil bleeding or non-compliance with filling requirements occurs, the mix proportion of the mixture should be checked, and measures such as adjusting the amount of adhesive mortar should be taken to improve the situation.

[0089] Thick layer construction: Due to the high temperature non-displacement property and good compaction efficiency of FMA, thick layer construction can be carried out. In this embodiment, the construction thickness of a single paving and compaction can reach 2~20cm, which effectively shortens the construction cycle and reduces construction costs.

[0090] S5, Inspection Procedure During construction, key performance indicators of the mixture need to be dynamically monitored, mainly including two aspects: mortar fluidity testing and asphalt-aggregate ratio testing. Mortar fluidity testing uses a mixture sieve analysis method to determine the fluidity of the flowable mortar asphalt mixture. The mixture is sieved through a standard sieve to analyze its ability and speed of passing through the sieve, thus judging the flow state of the mortar. A qualified FMA mixture should have good mortar fluidity, ensuring that the mortar can fully fill the gaps in the aggregate skeleton during paving and compaction. If insufficient mortar fluidity is detected, the mixture temperature, gradation, or asphalt content should be checked and adjusted promptly. Asphalt-aggregate ratio testing uses a combustion test method to quantitatively sample and test the asphalt-aggregate ratio of the flowable mortar asphalt mixture. By measuring the variation range of the asphalt-aggregate ratio in multiple batches of transport vehicles, the uniformity and stability of the mixture are tested. A qualified FMA mixture should have a stable asphalt-aggregate ratio within the set range, with minimal fluctuations. If an abnormal asphalt-aggregate ratio is found, the metering devices and raw material quality of mixing unit A should be checked to ensure the accuracy of the mixture proportions.

[0091] After construction was completed, core samples taken from the site were tested and analyzed to verify the actual effectiveness of the construction method of this invention. (Refer to...) Figure 9 The paper presents photographs of core samples taken from the site, shows the porosity of the samples, and analyzes the core samples using CT scans. The results indicate that the pavement prepared using the construction method of this invention has an internal porosity close to zero, achieving the ideal state of skeleton-ultra-dense. Road performance testing was then conducted, including semi-circular bending tests, uniaxial penetration tests, and interlayer shear tests. All test indicators met or exceeded the established standards, fully verifying the scientific validity and feasibility of the construction method of this invention.

[0092] This invention fully leverages the performance advantages of FMA through the coordinated operation of mixing, transportation, operation, compaction, and testing processes, achieving stable molding of the skeleton-ultra-dense structure, effectively extending the service life of the pavement, providing standardized technical support for the large-scale engineering application of FMA, and significantly improving the quality of pavement construction and service life.

[0093] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention should be considered equivalent substitutions and are included within the protection scope of the present invention. The embodiments described in this disclosure are intended as non-limiting examples, and other embodiments may take various and alternative forms. Furthermore, the drawings are not necessarily to scale and may present simplified expressions of various features of the present disclosure, including, for example, specific dimensions, orientations, positions, and shapes. Details associated with such features will be determined in part by the intended application and usage environment of the described embodiments.

[0094] The detailed description and accompanying drawings are supporting and descriptive of this teaching, but the scope of this teaching is defined only by the claims. While the best mode and some other embodiments for carrying out this teaching have been described in detail, various alternative designs and embodiments exist for practicing the teaching as defined in the appended claims. Furthermore, this disclosure expressly includes combinations and sub-combinations of the elements and features set forth above and below.

Claims

1. A construction system for a fluidized asphalt mixture, characterized in that, include: The mixing unit is used to prepare coarse and fine aggregates, asphalt and fillers according to the gradation curve and composition parameters of the flowable asphalt mixture. The mixing temperature T℃ of the mixing unit is determined by the isoviscous temperature corresponding to a viscosity of 0.5 Pa·s in the asphalt mixture. The transport unit includes a mobile device and a box disposed on the upper part of the mobile device. A cylindrical body is disposed inside the box, and the cylindrical body divides the space inside the box into a heat medium chamber and a storage chamber. The upper part of the storage chamber is provided with a feed inlet, and the rear end wall of the storage chamber is provided with a discharge outlet, wherein the discharge outlet is provided with a rotatable unloading device. The storage chamber is equipped with a turning device and a conveying device arranged vertically. The turning device is used to maintain the uniform coating state of the fluidized asphalt mixture, and the conveying device is used to transport the fluidized asphalt mixture to the discharge port. The heat medium chamber is provided with a medium inlet and a medium outlet. The heat medium chamber is provided with a heating element and a first temperature sensor. The storage chamber is provided with a second temperature sensor. The heating element, the first temperature sensor and the second temperature sensor are used to control the temperature of the mixture within the range of T-10~T+10℃ during transportation. The work unit is connected to the unloading device of the transport unit and is used to receive the fluidized asphalt mixture and perform paving or repair operations. The compaction unit is used to compact the fluidized asphalt mixture after paving or repair. The initial compaction temperature of the compaction unit is controlled at T-10~T+10℃, and the secondary compaction temperature is ≥T-20℃.

2. The construction system according to claim 1, characterized in that, The turning device includes a pair of rotating shafts extending along the length of the storage chamber, with the two ends of the rotating shafts rotatably disposed at the two ends of the storage chamber, and a plurality of turning blades disposed on the outer wall of the rotating shafts along their length. The conveying device is a screw conveyor, which includes a main shaft and helical blades fixed on the main shaft. The main shaft is supported on the end wall of the lower part of the storage chamber, and one end of the main shaft is provided with a power input component, while the other end extends to the discharge port.

3. The construction system according to claim 1, characterized in that, The unloading device includes a unloading valve disposed at the discharge port, a base fixed to the upper part of the moving device, a rotating column rotatably disposed on the base, and an inclined plate disposed at the upper end of the rotating column. The unloading valve is used to control the unloading of the flowing asphalt mixture. The inclined plate is located below the discharge port and is used to receive and guide the unloaded mixture. The rotating column can drive the inclined plate to rotate between a retracted position and an extended position.

4. The construction system according to claim 1, characterized in that, The working unit is a paving device, which includes a frame, a auger distributor located on the front side of the frame, and a screed located on the rear side of the frame. The auger distributor is connected to the unloading device and is used to receive the flowing asphalt mixture. The screed is used to vibrate and level the flowing asphalt mixture after paving.

5. The construction system according to claim 1, characterized in that, The transport unit also includes a controller, which is mounted on the mobile device and is electrically connected to the first temperature sensor, the second temperature sensor, the heating element, the turning device, and the conveying device.

6. The construction system according to claim 1, characterized in that, The compaction unit includes a steel-wheeled vibratory roller and a rubber-tired roller. The compaction unit is configured to first use the steel-wheeled vibratory roller for compaction, and then use the rubber-tired roller for compaction.

7. A construction process for a flowable asphalt mixture using the construction system described in any one of claims 1-6, characterized in that, The process includes the following steps: In the mixing process, the mixing unit is used to prepare coarse and fine aggregates, asphalt and fillers according to the gradation curve of the flowing mortar asphalt mixture. Dry mixing is carried out for 30~45s, wet mixing for 10~15s, and the mixing temperature T℃ is determined by the isoviscosity temperature corresponding to the mortar viscosity of 0.5Pa·s. In the transportation process, the transportation unit is used to transport the fluidized asphalt mixture. During transportation, the temperature is detected by the first temperature sensor and the second temperature sensor, and the heating element is controlled by the controller to keep the temperature of the fluidized asphalt mixture within the range of T-10~T+10℃. The heat preservation transportation time is ≤180min. During transportation, the turning device keeps the mixture constantly turning, and the conveying device transports the fluidized asphalt mixture to the discharge port. The work process involves unloading the fluidized asphalt mixture from the transport unit into the work unit via the unloading device for paving or repair work. The compaction process is carried out immediately after paving or repair, using the compaction unit. The initial compaction temperature is controlled at T-10~T+10℃, the secondary compaction temperature is ≥T-20℃, and compaction is carried out until the skeleton is stably formed.

8. The construction process according to claim 7, characterized in that, In the compaction process, a steel-wheeled vibratory roller is first used for compaction, followed by a rubber-tired roller.

9. The construction process according to claim 7, characterized in that, The thickness of the flowable asphalt mixture during a single paving and compaction process is 2-20 cm.

10. The construction process according to claim 7, characterized in that, It also includes testing procedures, such as using the mixture screening method to test the fluidity of the asphalt mixture and using a combustion test to quantitatively sample and check the asphalt-aggregate ratio.

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