Pavement compaction quality detection and deformation sensing aggregate based on 3D printing

Abstract

The invention relates to a pavement compaction quality detection and deformation sensing aggregate based on 3D printing. The aggregate comprises a wireless sensing module and a 3D printing aggregate shell. The wireless sensing module is formed by connecting a plurality of elements and comprises a sensing element, a wireless transmission element, a remote switch element, a voltage stabilizing element, a wireless charging element and a button battery; the 3D printing material collecting shell is of a multi-layer composite material structure and comprises a porous vacuum silicon heat insulation layer, a polyamide cured rubber modified epoxy resin buffer layer and a carbon fiber reinforced thermoplastic polyester composite material 3D printing stress layer from inside to outside. The device has the characteristics of simplicity in installation, high detection efficiency, small environmental influence and capability of being embedded into a pavement structure as aggregate particles, and real-time dynamic response information of the internal structure of the asphalt mixture in compaction and service stages can be accurately known under the conditions that the road structure is not damaged and the road service is not influenced; further, the pavement compaction strategy and the maintenance time are accurately regulated and selected, so that the pavement compaction quality is improved, and the maintenance cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of pavement compaction quality detection and deformation perception, and particularly relates to an aggregate for pavement compaction quality detection and deformation perception based on 3D printing. Background Art

[0002] Asphalt pavements are widely used in road engineering construction and bear vehicle loads under the influence of different environments. During the road construction stage, compaction refers to the process in which aggregates continuously move and interact under the action of external loads and asphalt lubrication, and the voids gradually decrease and finally form a stable structure. Good compaction quality can effectively improve the strength and durability of asphalt pavements, while problems such as rutting and cracking caused by under-compaction and aggregate crushing and bleeding caused by over-compaction will affect the road performance and structural life of the road. During the road service stage, asphalt pavements usually suffer from various pavement diseases as the service time increases. Among them, pavement deformation, as one of the common diseases of roads, not only exacerbates the pavement damage process, consumes additional maintenance costs, but also affects driving comfort and safety. Therefore, it is particularly important to conduct real-time and accurate compaction quality detection during the road construction stage to adjust the compaction strategy, and to repair the pavement deformation diseases in a timely manner when slight deformation occurs in the early stage of the road service stage, for the economy of road construction and operation and the comfort and safety of drivers.

[0003] Traditional pavement compaction quality detection methods mainly include core drilling method, density meter method, etc., which have the disadvantages of low detection efficiency and damage to the pavement structure; ground penetrating radar method can perform non-destructive detection on the pavement compaction situation, but the detection accuracy is interfered by factors such as medium uniformity and road surface conditions; and the above methods can only provide post-construction information and cannot help adjust the compaction strategy through real-time data feedback. Common pavement deformation detection technologies include image detection, laser scanning detection, ground penetrating radar detection, infrared thermal imaging detection, etc., which have problems such as low detection efficiency, high detection cost, large influence of detection results on environmental factors, inability to detect diseases and repair them in a timely manner, resulting in increased maintenance costs. Among the pavement deformation detection methods using sensors, the disadvantages of fiber optic sensor detection are difficult installation and damage to the road structure, and the accuracy of vehicle-mounted inertial sensor detection results seriously depends on the stability of vehicle speed.

[0004] Aggregates account for more than 90% of the mass of asphalt mixture materials and have relatively significant movement characteristics during pavement compaction and deformation. Real-time collection of the dynamic response information of aggregate particles during the compaction process of asphalt mixture can study the compaction mechanism of asphalt mixture from the particle scale, evaluate the compaction state of asphalt pavement in real time, and improve the compaction quality through feedback control. Based on the real-time collection of the movement characteristics of aggregate particles during the road service stage, early detection of pavement deformation diseases can effectively avoid greater deformation diseases on the pavement.

[0005] In summary, the present application proposes a road surface compaction quality detection and deformation perception aggregate based on 3D printing, which has the characteristics of simple installation, low cost, high detection efficiency, little influence from the environment, and can be embedded in the road surface structure as aggregate particles. It can accurately understand the movement characteristics of the aggregate during the compaction stage and service stage without damaging the road structure and affecting road service, obtain real-time dynamic response information of the internal structure of asphalt mixture, so as to improve the road surface compaction quality, timely detect road surface deformation diseases and maintain them, which has important significance for extending the service life of roads and optimizing road operation economy. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a road surface compaction quality detection and deformation perception aggregate based on 3D printing.

[0007] The technical solution adopted by the present invention to solve the above technical problem is as follows:

[0008] A road surface compaction quality detection and road surface deformation perception aggregate based on 3D printing, including a wireless sensing module and a 3D printed aggregate shell; characterized in that the wireless sensing module is composed of multiple elements connected, including a sensing element, a wireless transmission element, a remote switch element, a voltage stabilizing element, a wireless charging element and a button battery; the 3D printed aggregate shell is a multi-layer composite material structure, including a heat insulation layer, a buffer layer and a stress layer in order from the inside to the outside.

[0009] The sensing element and the wireless transmission element are connected in parallel through the VCC, RX, TX, GND serial ports. One end of the live wire and the ground wire in the remote switch element is connected to the wireless transmission element, and the other end is connected in series with the V0 and G of the voltage stabilizing element. The voltage stabilizing element is connected in series with the wireless charging element through V1 and G, and finally connected to the button battery to form a circuit. The above elements are all connected by wires and fixed by soldering.

[0010] The heat insulation layer is a porous vacuum silicon material, the buffer layer is a polyamide-cured rubber-modified epoxy resin material, and the stress layer is made of a carbon fiber-reinforced thermoplastic polyester composite material 3D printed based on an aggregate model defined according to the aggregate shape standard.

[0011] The sensing element is a six-axis or nine-axis attitude sensor, which records various parameters such as acceleration, angular velocity, magnetic field, temperature, etc. through the TTL serial port communication method, and its size is 15*15*2mm.

[0012] The wireless transmission element adopts the Zigbee self-organizing network transmission mode, can receive data sent by multiple transmission elements simultaneously through the data receiving end, and the farthest transmission distance reaches 150m, and its size is 18*16*2.3mm.

[0013] The remote switch element is controlled by a supporting remote control device to switch the wireless sensing module through radio frequency signals, and its size is 17.5*11*5 mm.

[0014] The voltage stabilizing element controls the voltage in the circuit by winding the coil to ensure that the wireless sensing module is at a safe operating voltage, and its size is 10.8*7.7*5.6 mm.

[0015] The wireless charging element consists of a receiving coil, a rectifying circuit and a control chip. The rectifying circuit and the control chip are integrated designs. An external charger composed of a transmitting coil and a control circuit can charge wirelessly within a specified distance, ensuring that the 3D printing-based pavement compaction quality detection and deformation perception aggregate with a shallow burial depth has good battery life.

[0016] The button battery is formed by connecting multiple button batteries in parallel, with a total capacity of 360 mA. The size of a single battery is 20*20*5 mm, and it supports rechargeable cyclic use.

[0017] The heat insulation layer is wrapped around the wireless sensing module, with a thickness of 1.5 mm. There are a large number of pores in the silicon matrix of the porous vacuum silicon material, and the interior of the pores is approximately in a vacuum state.

[0018] The buffer layer has good elasticity, impact resistance and flexibility, with a thickness of 1.5 mm. The standard buffer layer is mass-produced by 3D printing technology and silicone mold turning process.

[0019] The stress-bearing layer has good heat resistance and toughness, with a thickness of 2 mm. Compared with natural aggregates, it has standard sizes, shapes and approximate mechanical properties.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] (1) The present invention can be buried inside the asphalt mixture during the paving process according to a certain layout rule, serving as aggregate particles for compaction quality detection and deformation perception, and collecting and transmitting in real time the dynamic response information inside the asphalt mixture such as the acceleration, rotation angle, and temperature of the pavement compaction quality detection and deformation perception aggregate based on 3D printing. During the compaction stage, the motion characteristics of the pavement compaction quality detection and deformation perception aggregate based on 3D printing with reasonable layout in each layer can reflect the compaction state of the asphalt mixture. During the operation stage, the pavement compaction quality detection and deformation perception aggregate based on 3D printing with a relatively shallow burial depth can undertake the task of detecting pavement deformation, enabling the staff to timely understand the compaction state and deformation degree of the pavement structure, and then precisely adjust and select the compaction strategy and maintenance timing; the pavement compaction quality detection and deformation perception aggregate based on 3D printing conforms to the standard definition of the aggregate shape, can evaluate the motion characteristics of aggregates with different shapes, and provides data reference for the selection of aggregates in road design; the pavement compaction quality detection and deformation perception aggregate based on 3D printing has the advantages of simple installation, low cost, high detection efficiency, little influence from the environment, no damage to the pavement structure, and no impact on the pavement service life.

[0022] (2) The present invention uses the Zigbee self-organizing network module as the wireless transmission element. While effectively increasing the transmission distance, it ensures that only elements on the same channel can send and receive, avoiding data disorder of multiple elements; the data receiving end can also receive data sent by multiple elements, realizing the control of a single machine over multiple groups of pavement compaction quality detection and deformation perception aggregates based on 3D printing.

[0023] (3) The present invention uses button batteries, effectively reducing the size of the power supply while avoiding the problems of battery life and leakage that may occur when using small lithium batteries. The use of an external charger and an internal wireless charging element further ensures that the pavement compaction quality detection and deformation perception aggregate based on 3D printing with a relatively shallow burial depth has good battery life, and avoids the problems that the protruding wire in wired charging affects the pavement flatness or the wire damage causes the pavement compaction quality detection and deformation perception aggregate based on 3D printing to be unable to work continuously.

[0024] (4) The 3D-printed aggregate shell of the present invention adopts a multi-layer composite material structure with an inner heat insulation layer, a buffer layer, and a stress layer from the inside to the outside, taking into account the heat insulation requirements of the wireless sensing module of the pavement compaction quality detection and deformation perception aggregate based on 3D printing during the asphalt mixture compaction stage, the anti-impact requirements under the action of compaction equipment load and vehicle repeated load, as well as the strength and durability requirements during compaction and long-term monitoring, improving the economy while having performance similar to natural aggregates. Description of the Drawings

[0025] Figure 1 is the overall structural schematic diagram of the present invention;

[0026] Figure 2 Schematic diagram of the connection structure of the wireless sensing module according to an embodiment of the present invention;

[0027] Figure 3 Schematic diagram of the stress-bearing layer of 3D printed aggregate shells with different shapes according to an embodiment of the present invention.

[0028] In the figure, 1 - sensing element; 2 - wireless transmission element; 3 - remote switch element; 4 - voltage stabilizing element; 5 - wireless charging element; 6 - button battery; 7 - heat insulation layer; 8 - buffer layer; 9 - stress-bearing layer; 31 - remote control device. Specific implementation manners

[0029] The technical solutions of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, and are not used to limit the protection scope of the present application.

[0030] Embodiment: As Figures 1-3 shown, an aggregate for pavement compaction quality detection and deformation perception based on 3D printing in this embodiment includes a wireless sensing module and a 3D printed aggregate shell; characterized in that the wireless sensing module is composed of multiple elements connected, including a sensing element 1, a wireless transmission element 2, a remote switch element 3, a voltage stabilizing element 4, a wireless charging element 5 and a button battery 6, and each element is connected by wires and fixed by soldering; the 3D printed aggregate shell is a multi-layer composite material structure, and includes a heat insulation layer 7, a buffer layer 8 and a stress-bearing layer 9 in order from the inside to the outside.

[0031] The sensing element 1 and the wireless transmission element 2 are connected in parallel through the VCC, RX, TX, GND serial ports. One end of the live wire and the ground wire in the remote switch element 3 is connected to the wireless transmission element 2, and the other end is connected in series with the V0 and G ports of the voltage stabilizing element 4. The voltage stabilizing element 4 is connected in series with the wireless charging element 5 through V1 and G, and finally connected to the button battery 6 to form a circuit.

[0032] The heat insulation layer 7 is a porous vacuum silicon material, the buffer layer 8 is a polyamide-cured rubber-modified epoxy resin material, and the stress-bearing layer 9 is made of a carbon fiber-reinforced thermoplastic polyester composite material 3D printed based on an aggregate model defined according to the aggregate shape standard.

[0033] The sensing element 1 is a six-axis attitude sensor, and records various parameters such as triaxial acceleration, angular velocity, and temperature in the space coordinates through the TTL serial port communication method, and the size is 15*15*2 mm. The parameter information is shown in Table 1.

[0034] Table 1 Parameter information of the sensing element 1

[0035]

[0036] The wireless transmission component 2 adopts the Zigbee self-organizing network transmission mode and can receive data sent by multiple transmission components simultaneously through the data receiving end. The wireless transmission component 2 needs to be set to the same transmission baud rate as the sensing component 1, with an adjustable baud rate range of 38400 - 115200, and its size is 18 * 16 * 2.3 mm. The parameter information is shown in Table 2.

[0037] Table 2 Parameter Information of Wireless Transmission Component 2

[0038]

[0039] The remote switch component 3 is controlled by the supporting remote control device 31 to switch the wireless sensing module through radio frequency signals, and its size is 17.5 * 11 * 5 mm. The parameter information is shown in Table 3.

[0040] Table 3 Parameter Information of Remote Switch Component 3

[0041]

[0042] The voltage stabilizing component 4 controls the voltage in the circuit by winding the coil, controls the voltage of 3.3 - 6.5V to 3.3V, and ensures that the wireless sensing module is in a safe operating voltage. Its size is 10.8 * 7.7 * 5.6 mm.

[0043] The wireless charging component 5 consists of an internal receiving coil, a rectifying circuit and a control chip. The rectifying circuit and the control chip are integrally designed, and can be wirelessly charged within a specified distance through an external charger composed of a transmitting coil and a control circuit, ensuring that the 3D printing-based pavement compaction quality detection and deformation perception aggregate with a shallow burial depth has good battery life. Its size is 18 * 15 * 2 mm. The parameter information is shown in Table 4.

[0044] Table 4 Parameter Information of Wireless Charging Component 5

[0045]

[0046] The button battery 6 is formed by connecting multiple button batteries in parallel, with a total capacity of 360 mA. The size of a single battery is 20 * 20 * 5 mm. It replaces the conventional lithium battery as the power supply module, avoids reducing the service life of the 3D printing-based pavement compaction quality detection and deformation perception aggregate due to leakage, has a more durable battery life and supports charging and recycling.

[0047] The heat insulation layer 7 is wrapped around the wireless sensing module, with a thickness of 1.5 mm. There are a large number of pores in the silicon matrix of the porous vacuum silicon material, and the inside of the pores is approximately in a vacuum state.

[0048] The elastic, impact-resistant and flexible properties of the buffer layer 8 are good, and its thickness is 1.5 mm. The standard buffer layer is mass-produced through 3D printing technology and silicone mold turning process.

[0049] The heat resistance and toughness of the stress-bearing layer 9 are good, and its thickness is 2 mm. It is made by 3D printing of carbon fiber reinforced thermoplastic polyester composite material with three standard aggregate shapes: angular, spherical and flaky. Compared with natural aggregates, it has standard size, shape and approximate mechanical properties.

[0050] The working process of the present invention is as follows: The 3D printing-based road compaction quality detection and deformation sensing aggregate is buried in the asphalt mixture during the paving process according to a certain layout rule. During the road compaction stage and service stage, when it is necessary to detect the road compaction quality and sense the road deformation, click the remote control device 31 to start the 3D printing-based road compaction quality detection and deformation sensing aggregate. After the sensing element 1 records the data, it is transmitted to the remote data receiving end by the wireless transmission element 2. After the work is completed, click the remote control device 31 to turn off the 3D printing-based road compaction quality detection and deformation sensing aggregate. After the power of the 3D printing-based road compaction quality detection and deformation sensing aggregate is exhausted, the staff can carry an external charger to the layout location to charge the 3D printing-based road compaction quality detection and deformation sensing aggregate with a relatively shallow burial depth, and the wireless charging element 5 is responsible for receiving the current.

[0051] Matters not described in the present invention are applicable to the prior art.

Claims

1. A pavement compaction quality detection and pavement deformation perception aggregate based on 3D printing, comprising a wireless sensing module and a 3D printed aggregate shell; characterized in that, The wireless sensing module is composed of multiple components connected together, including a sensing component, a wireless transmission component, a remote switch component, a voltage stabilizing component, a wireless charging component, and a button battery. The 3D printed aggregate shell is a multi-layer composite structure, which includes a heat insulation layer, a buffer layer, and a stress-bearing layer in order from the inside to the outside; The sensing component and the wireless transmission component are connected in parallel through the VCC, RX, TX, and GND serial ports. One end of the live wire and the ground wire in the remote switch component is connected to the wireless transmission component, and the other end is connected in series with V0 and G of the voltage stabilizing component. The voltage stabilizing component is connected in series with the wireless charging component through V1 and G, and finally connected to the button battery to form a circuit. The above components are all connected by wires and fixed by soldering; The heat insulation layer is made of porous vacuum silicon material, the buffer layer is made of polyamide-cured rubber-modified epoxy resin material, and the stress-bearing layer is made by 3D printing of carbon fiber-reinforced thermoplastic polyester composite material based on the aggregate model defined by the aggregate shape standard.

2. The aggregate for pavement compaction quality detection and pavement deformation perception based on 3D printing according to claim 1, wherein The sensing component is a six-axis or nine-axis attitude sensor, which records various parameters such as acceleration, angular velocity, magnetic field, and temperature through the TTL serial communication method, and its size is 15*15*2mm; the wireless transmission component adopts the Zigbee self-organizing network transmission mode, and receives data sent by multiple transmission components simultaneously through the data receiving end, with a maximum transmission distance of 150m, and its size is 18*16*2.3mm; the remote switch component is controlled by a supporting remote control device to switch the wireless sensing module through radio frequency signals, and its size is 17.5*11*5mm; the voltage stabilizing component controls the voltage in the circuit by winding coils to make the wireless sensing module operate at a safe working voltage, and its size is 10.8*7.7*5.6mm.

3. A kind of aggregate for detecting pavement compaction quality and sensing pavement deformation based on 3D printing according to claim 1, characterized in that, The wireless charging component is composed of a receiving coil, a rectifying circuit, and a control chip. The rectifying circuit and the control chip are integrated designs, and can be wirelessly charged within a specified distance by an external charger composed of a transmitting coil and a control circuit, ensuring that the 3D printed pavement compaction quality detection and deformation perception aggregate with a shallow burial depth has good battery life; the button battery is composed of multiple button batteries connected in parallel, with a total capacity of 360mA, and the size of a single battery is 20*20*5mm, supporting charging and recycling.

4. A kind of aggregate for detecting the compaction quality of road surface and perceiving road surface deformation based on 3D printing according to claim 1, characterized in that The heat insulation layer is wrapped around the wireless sensing module, with a thickness of 1.5mm. There are a large number of pores in the silicon matrix of the porous vacuum silicon material, and the inside of the pores is approximately in a vacuum state; the buffer layer has good elasticity, impact resistance, and flexibility, with a thickness of 1.5mm. The standard buffer layer is mass-produced through 3D printing technology and silicone mold turning process; the stress-bearing layer has good heat resistance and toughness, with a thickness of 2mm. Compared with natural aggregates, it has standard dimensions, shapes, and approximate mechanical properties.

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