Information collection device and method of intelligent pavement structure

Abstract

The application discloses an information collection device and method of intelligent pavement structure, and the method is based on piezoresistive cement-based composite material and comprises the following steps: laying a first strain gauge, a second electrode and a first electrode in a piezoresistive cement-based material prefabricated component; connecting an information collection system to the first electrode and the second electrode respectively; connecting the information collection system to a computer, and using the computer to display signal change; when a vehicle drives on the road and rolls on the piezoresistive cement-based material prefabricated component, the first strain gauge, the second electrode and the first electrode all change; and the information collection system transmits the resistance change information to the computer to display the resistance change size. Through the assembled self-sensing piezoresistive cement-based material, the pavement can be locally replaced, which is convenient for future maintenance and replacement, does not affect the existing cement concrete pavement structure, and saves the cost.

Description

Technical Field

[0001] This invention belongs to the field of materials and road technology, and relates to an information acquisition device and method for intelligent road structure. Background Technology

[0002] In recent years, many new research results have emerged in intelligent pavement. The main purpose of researching intelligent pavement is to achieve the monitoring of the structural health of the pavement itself and the collection of road information such as traffic flow, that is, the intelligentization of roads and traffic. Among them, the structural health monitoring of cement pavement is achieved through piezoresistive cement-based composite materials. Through analysis of relevant research, it can be found that the conductivity of cement-based composite materials is the basis of piezoresistive performance. Conductive phase materials such as graphite, carbon nanotubes, carbon fibers, graphene, and steel fibers are often used as cement modifiers to change the conductivity of cement itself, thereby enabling cement-based composite materials to have conductivity and piezoresistive properties.

[0003] Traditional structural monitoring methods primarily focus on detecting concrete strain, strength, and internal defects. These methods mainly include sensor-based monitoring using sensing elements such as strain gauges, resistance strain gauges, and fiber optic sensors. Sensors effectively transmit vehicle and road surface condition information, and their low cost allows for widespread deployment, playing a significant role in intelligent road systems. However, traditional sensors have limitations. There is a modulus mismatch between the sensor and the concrete pavement structure, resulting in poor compatibility. Furthermore, the sensors themselves have poor durability, are prone to failure, and are difficult to replace, making long-term stable operation challenging. Summary of the Invention

[0004] The purpose of this invention is to solve the problems in the prior art where sensors cannot be well compatible with concrete pavement structures, sensors are prone to failure, and cannot be replaced in real time, and to provide an information acquisition device and method for intelligent pavement structures.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] An information acquisition device for a smart pavement structure includes: a piezoresistive sensing system, an information acquisition system, and a computer;

[0007] The piezoresistive sensing system includes a first electrode, a second electrode, a first strain gauge, and a precast piezoresistive cement-based material component; the precast piezoresistive cement-based material component is placed in a concrete pavement.

[0008] The first strain gauge, the second electrode, and the first electrode are laid inside the piezoresistive cement-based precast component;

[0009] The information acquisition system is connected to the first electrode and the second electrode respectively; the information acquisition system is connected to a computer, which is used to display the signal changes.

[0010] A further improvement of the present invention is as follows:

[0011] The information acquisition system includes: a first resistor, a second resistor, a third resistor, a fourth resistor, a power supply, a second strain gauge, and a piezoresistive cement-based material sensor;

[0012] One end of the first resistor is connected to one end of the power supply, one end of the third resistor, and one end of the second strain gauge; the other end of the first resistor is connected to one end of the piezoresistive cement-based material sensor; the other end of the second strain gauge is connected to the other end of the second resistor; the other end of the third resistor is connected to one end of the fourth resistor; the other end of the fourth resistor is connected to the other end of the second resistor, the other end of the power supply, and the other end of the piezoresistive cement-based material sensor; the second strain gauge is composed of several first strain gauges connected in series.

[0013] Precast components made of pressure-resistive cement-based materials also include: pressure-resistive cement-based composite materials and reinforcing steel;

[0014] The first electrode, the first strain gauge, the second electrode, and the reinforcing steel are laid in sequence, and the piezoresistive cement-based composite material is poured between the first electrode, the first strain gauge, the second electrode, and the reinforcing steel to form a piezoresistive cement-based precast component; the piezoresistive cement-based composite material and the concrete are homogeneous cement-based materials.

[0015] The piezoresistive cement-based composite material includes cement, water, sand, conductive phase material, and dispersant. The preparation method of the piezoresistive cement-based composite material is as follows: cement, water, sand, conductive phase material, and dispersant are placed in a mixing pot in sequence, and stirring is carried out after each material is added to obtain the piezoresistive cement-based composite material. The conductive phase material includes graphite, carbon fiber, carbon nanotubes, and steel fiber.

[0016] The resistance of the first strain gauge is 120 ohms; the materials of the first and second electrodes are galvanized iron wire mesh.

[0017] The first and second electrodes are placed horizontally at a distance of 2.5 cm from the top and bottom of the concrete panel, respectively, with a spacing of 5 cm; both electrodes are 1500 mm × 150 mm in size.

[0018] The information collection system is connected to the computer, specifically as follows:

[0019] The other end of the second strain gauge and the other end of the third resistor are respectively connected to the computer; the first electrode and the second electrode are located at both ends of the piezoresistive cement-based material sensor; the first electrode and the second electrode are respectively connected to the computer.

[0020] A method for collecting information on intelligent road structures includes:

[0021] The first electrode, the first strain gauge, the second electrode, and the reinforcing steel are laid out in sequence, and the piezoresistive cement-based composite material is poured between the first electrode, the first strain gauge, the second electrode, and the reinforcing steel to form a precast piezoresistive cement-based component; this component is then placed in the road surface; an information acquisition system is connected to the first electrode, the second electrode, and the first strain gauge; the information acquisition system is connected to a computer, which is used to display signal changes;

[0022] When a vehicle travels on the road and runs over a precast component made of piezoresistive cementitious material, the resistance of the first strain gauge, the second electrode, and the first electrode will all change; the information acquisition system transmits the resistance change information to the computer to display the magnitude of the resistance change.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] This invention involves embedding a first strain gauge, a second electrode, and a first electrode inside a precast piezoresistive cement-based material component. The precast component is placed within a concrete pavement. An information acquisition system is connected to the first electrode, the second electrode, and the first strain gauge. This system is also connected to a computer. When a vehicle passes by, the first strain gauge, the second electrode, and the first electrode all change position. The information acquisition system transmits this information to the computer for display. Furthermore, this invention achieves compatibility with concrete pavement structures through a prefabricated, self-sensing piezoresistive cement-based material. It also allows for partial replacement of the pavement, facilitating future maintenance and replacement without affecting the existing cement concrete pavement structure, thus saving costs.

[0025] Furthermore, since conductive phase materials are introduced into cement-based composite materials, they can also serve as reinforcing elements to improve the strength and durability of pavement structures. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 A diagram of an information acquisition device for a smart road structure provided by the present invention;

[0028] Figure 2 This is a structural diagram of a precast component made of pressure-resistance cement-based material according to an embodiment of the present invention;

[0029] Figure 3Another structural diagram of the precast component of the pressure-resistance cement-based material provided by the present invention;

[0030] Figure 4 This is a test path layout diagram for information acquisition of piezoresistive cement-based materials provided by the present invention.

[0031] Wherein, 1-first electrode; 2-second electrode; 3-first strain gauge; 4-reinforcing bar; 9-vehicle; 10-concrete pavement; 11-groove; 12-first resistor; 13-piezoresistive cement-based material sensor; 14-second strain gauge; 15-second resistor; 16-third resistor; 17-fourth resistor; 18-computer; 19-power supply. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0035] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0036] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0037] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0038] The present invention will now be described in further detail with reference to the accompanying drawings:

[0039] See Figure 1 This invention discloses an information acquisition device for a smart road structure, comprising: a piezoresistive sensing system, an information acquisition system, and a computer 18;

[0040] The piezoresistive sensing system includes a first electrode 1, a second electrode 2, a first strain gauge 3, and a precast piezoresistive cement-based material component; the precast piezoresistive cement-based material component is placed in the concrete pavement 10;

[0041] The first strain gauge 3, the second electrode 2 and the first electrode 1 are laid inside the piezoresistive cement-based precast component;

[0042] The information acquisition system is connected to the first electrode 1 and the second electrode 2 respectively; the information acquisition system is connected to the computer 18, which is used to display the signal changes. The second strain gauge 14 is composed of several first strain gauges 3 connected in series.

[0043] The information acquisition system includes: a first resistor 12, a second resistor 15, a third resistor 16, a fourth resistor 17, a power supply 19, a second strain gauge 14, and a piezoresistive cement-based material sensor 13; one end of the first resistor 12 is connected to one end of the power supply 19, one end of the third resistor 16, and one end of the second strain gauge 14; the other end of the first resistor 12 is connected to one end of the piezoresistive cement-based material sensor 13; the other end of the second strain gauge 14 is connected to the other end of the second resistor 15; the other end of the third resistor 16 is connected to one end of the fourth resistor 17; and the other end of the fourth resistor 17 is connected to the other end of the second resistor 15, the other end of the power supply 19, and the other end of the piezoresistive cement-based material sensor 13.

[0044] The information acquisition system is connected to the computer 18, specifically: the other end of the second strain gauge 14 and the other end of the third resistor 16 are respectively connected to the computer 18; the first electrode 1 and the second electrode 2 are respectively connected to the computer 18; the first electrode 1 and the second electrode 2 are located at the two ends of the piezoresistive cement-based material sensor 13.

[0045] See Figure 2The precast component made of piezoresistive cement-based material consists of piezoresistive cement-based composite material, three steel bars 4, three first strain gauges 3, a first electrode 1 and a second electrode 2, and several wires. This structure is fabricated by injecting the piezoresistive cement-based composite material into a template with dimensions of 160cm × 20cm × 10cm.

[0046] When pouring cement-based composite materials, a vibrating table is used to ensure compaction. After pouring, the concrete sensor should be surface-smoothed and covered with a film to prevent moisture evaporation, and then cured at room temperature for 28 days.

[0047] The first electrode 1, the first strain gauge 3, the second electrode 2 and the reinforcing bar 4 are laid in sequence, and the piezoresistive cement-based composite material is poured between the first electrode 1, the first strain gauge 3, the second electrode 2 and the reinforcing bar 5 to form a piezoresistive cement-based precast component.

[0048] The piezoresistive cement-based composite material comprises cement, water, sand, a conductive phase material, and a dispersant; the preparation method of the piezoresistive cement-based composite material is as follows: cement, water, sand, conductive phase material, and dispersant are placed in a mixing pot in sequence, and stirring is performed after each material is added to obtain the piezoresistive cement-based composite material; the conductive phase material includes: graphite, carbon fiber, carbon nanotubes, and steel fiber.

[0049] The spacing between adjacent strain gauges 3 is 50 cm. The resistance of strain gauge 3 is 120 ohms, and it can monitor deformation displacement of 60 mm longitudinally and 1 mm horizontally.

[0050] See Figure 3 The first electrode 1 and the second electrode 2 are made of galvanized iron wire mesh and are placed horizontally 2.5 cm away from the top and bottom of the concrete panel, respectively, with a spacing of 5 cm between them. Both the first electrode 1 and the second electrode 2 are 1500 mm × 150 mm in size. Three steel bars 4 are made of 6 mm diameter plain round steel bars and are arranged horizontally along the length of the structure.

[0051] See Figure 4 A groove 11, measuring 165*25*10cm, is cut into the existing cement concrete pavement. A prefabricated piezoresistive cement-based composite material sensor is fixed inside the groove 11 using cement mortar, forming a piezoresistive sensing system together with the cement concrete pavement 10. It is then covered and cured for 30 days to complete its formation.

[0052] The installation of the electrical wires and the prefabricated components of the piezoresistive cement-based material were carried out simultaneously, and the electrical wires were copper core PVC insulated wires.

[0053] This invention discloses a method for collecting information on intelligent road structures, including...

[0054] The first electrode 1, the first strain gauge 3, the second electrode 2, and the reinforcing bar 4 are laid in sequence, and the piezoresistive cement-based composite material is poured between the first electrode 1, the first strain gauge 3, the second electrode 2, and the reinforcing bar 4 to form a precast piezoresistive cement-based component; and placed in the road surface; the information acquisition system is connected to the first electrode 1, the second electrode 2, and the first strain gauge 3 respectively; the information acquisition system is connected to the computer 18, and the computer 18 is used to display the signal changes;

[0055] When a vehicle travels on the road and runs over a precast component made of piezoresistive cementitious material, the resistance of the first strain gauge 3, the second electrode 2, and the first electrode 1 will all change; the information acquisition system transmits the resistance change information to the computer 18 to display the magnitude of the resistance change.

[0056] When a vehicle load is applied to the road surface, the road surface will deform, causing changes in the internal conductive path of the piezoresistive cement-based material sensor, which in turn changes the resistance. At the same time, the first strain gauge will also detect the deformation and receive the electrical signal through the external computer 18. This allows for a comparison of the performance of the piezoresistive sensor structure and the strain gauge system in terms of strain sensing.

[0057] Since the resistance inside the piezoresistive cement-based composite material changes when vehicle 9 passes by, the voltage across the piezoresistive cement-based composite material sensor and the first strain gauge 3 is used as the detection index when vehicle 9 passes by after a stable current is applied. The sampling frequency is 1000 Hz.

[0058] Because concrete is a rigid material, the vehicle load is considered to be at least 0.8 MPa, based on a typical family sedan as the lower limit. For example, the pressure between the vehicle tires and the road surface should be at least 0.8 MPa. Figure 4 The test road layout is shown. The load magnitude, location of action, stress on the cement concrete pavement 10, and damage condition are determined based on the voltage changes of the piezoresistive cement-based sensing system measured before and after vehicle 9 passes.

[0059] In this embodiment of the invention, the thickness of the piezoresistive cement-based material sensor can be adjusted appropriately according to the actual thickness of the existing road surface, but the minimum protective layer thickness of the electrode mesh must be guaranteed.

[0060] The working principle of this invention is as follows: When a vehicle's tires act on or near an existing concrete road surface on or near a piezoresistive cement-based sensor, the resistance of both the sensor and the strain gauge changes due to internal deformation or cracking. The magnitude of this resistance change can be used to determine the current condition of the road surface, thereby achieving intelligent monitoring of road health. Furthermore, the information acquisition by the piezoresistive cement-based material is reversible within its ultimate load range.

[0061] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1.A method for information collection of a smart pavement structure, characterized in that, The information acquisition device based on a smart pavement structure comprises a piezoresistive sensing system, an information acquisition system and a computer (18). The piezoresistive sensing system comprises a first electrode (1), a second electrode (2), a first strain gauge (3) and a piezoresistive cement-based material prefabricated component in a plate shape; the piezoresistive cement-based material prefabricated component is placed in a concrete pavement, the first electrode (1) and the second electrode (2) are respectively placed horizontally at a distance of 2.5 cm from the top and bottom of the concrete panel, and the interval is 5 cm; The first strain gauge (3), the second electrode (2) and the first electrode (1) are laid inside the piezoresistive cement-based material prefabricated component; The information acquisition system is connected with the first electrode (1) and the second electrode (2) respectively; the information acquisition system is connected with the computer (18), and the computer (18) is used for displaying signal change conditions; The information acquisition system comprises a first resistor (12), a second resistor (15), a third resistor (16), a fourth resistor (17), a power supply (19), a second strain gauge (14) and a piezoresistive cement-based material sensor (13); One end of the first resistor (12) is connected with one end of the power supply (19), one end of the third resistor (16) and one end of the second strain gauge (14) respectively; the other end of the first resistor (12) is connected with one end of the piezoresistive cement-based material sensor (13); the other end of the second strain gauge (14) is connected with the other end of the second resistor (15); the other end of the third resistor (16) is connected with one end of the fourth resistor (17); the other end of the fourth resistor (17) is connected with the other end of the second resistor (15), the other end of the power supply (19) and the other end of the piezoresistive cement-based material sensor (13) respectively; the second strain gauge (14) is formed by connecting a plurality of first strain gauges (3) in series; The piezoresistive cement-based material prefabricated component further comprises a piezoresistive cement-based composite material and a steel bar (4); The first electrode (1), the first strain gauge (3), the second electrode (2) and the steel bar (4) are laid in sequence, the piezoresistive cement-based composite material is poured between the first electrode (1), the first strain gauge (3), the second electrode (2) and the steel bar (4) to form the piezoresistive cement-based material prefabricated component; the piezoresistive cement-based composite material and the concrete are homogeneous cement-based materials; The piezoresistive cement-based composite material comprises cement, water, sand, conductive phase material and dispersant; a preparation method of the piezoresistive cement-based composite material is that the cement, the water, the sand, the conductive phase material and the dispersant are sequentially placed in a mixing pot, and stirring is performed after adding each material to obtain the piezoresistive cement-based composite material; the conductive phase material comprises graphite, carbon fiber, carbon nanotube and steel fiber; The information acquisition system is connected with the computer (18), and specifically The other end of the second strain gauge (14) and the other end of the third resistor (16) are connected to a computer (18) respectively; the first electrode (1) and the second electrode (2) are located at two ends of the piezoresistive cement-based material sensor (13); the first electrode (1) and the second electrode (2) are connected to the computer (18) respectively; The first electrode (1), the first strain gauge (3), the second electrode (2) and the steel bar (4) are laid in sequence, and the piezoresistive cement-based composite material is poured between the first electrode (1), the first strain gauge (3), the second electrode (2) and the steel bar (4) to form a piezoresistive cement-based material prefabricated component; and the piezoresistive cement-based material prefabricated component is fixed in the groove of the road surface; an information acquisition system is connected to the first electrode (1), the second electrode (2) and the first strain gauge (3) respectively; the information acquisition system is connected to the computer (18), and the computer (18) is used for displaying signal change conditions; When the vehicle drives on the road and rolls on the piezoresistive cement-based material prefabricated component, the resistances of the first strain gauge (3), the second electrode (2) and the first electrode (1) all change; the information acquisition system transmits the resistance change information to the computer (18) to display the size of the resistance change. 2.The information collection method of the smart pavement structure according to claim 1, wherein, The resistance value of the first strain gauge (3) is 120 ohms; the materials of the first electrode (1) and the second electrode (2) are galvanized iron wire meshes. 3.The information collection method of the smart pavement structure according to claim 2, characterized in that, The sizes of the two electrodes are both 1500mm*150mm.

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