CN211199951U - Prefabricated carpet formula intelligence bituminous paving - Google Patents

Abstract

The utility model relates to a prefabricated carpet formula intelligence bituminous paving, including crimpable asphalt concrete layer and at least one intelligence aggregate unit, intelligence aggregate unit is arranged in with the mode of embedding in the crimpable asphalt concrete layer. The utility model provides a carpet formula bituminous paving of pre-buried intelligent sensor unit has realized bituminous paving's quick restoration to through the road surface dynamic response under the monitoring vehicle load effect, resolve out traffic information, realized the integration of quick maintenance and wisdom traffic technique.

Description

Prefabricated carpet formula intelligence bituminous paving

Technical Field

The utility model relates to a road engineering field, concretely relates to prefabricated carpet formula intelligence bituminous paving.

Background

With the acceleration of urbanization process in China and the large background of intelligent traffic development, urban roads are too large in load bearing and need high-frequency road maintenance and repair. The traditional repairing method has long maintenance time and high cost, not only causes serious traffic jam, but also hinders the realization and development of intelligent traffic. Because a large number of sensors need to be installed in a road for realizing intelligent traffic, the wild pavement construction process brings great threat to the sensors, the acquisition precision of the sensors is influenced slightly, and the sensors fail seriously.

Common road monitoring systems can be classified into embedded type and non-embedded type. Common road monitoring systems can be classified into embedded type and non-embedded type. Non-embedded monitoring technologies are generally used for traffic information monitoring, and include pneumatic pipes, cameras, ultrasonic systems, infrared rays and radar systems, but the non-embedded monitoring technologies cannot acquire vehicle weight information and are susceptible to weather and artificial damage. The sensors adopted by the embedded monitoring system comprise a fiber grating strain sensor, a stress strain (sheet) sensor, a pressure sensor, a quartz piezoelectric sensor, a displacement sensor, a temperature sensor and a humidity sensor. These sensors are usually buried in the road and transmit the monitoring data to the acquisition equipment by cable. Since the front-end sensor is only used for sensing and has no data processing and storing functions, a large amount of monitoring data is difficult to process in real time, and communication blockage and data redundancy are caused. The high power consumption and high cost of the adapter and data acquisition equipment make the system expensive to install, operate and maintain. Furthermore, the embedding of these sensors into the road surface destroys the integrity of the road structure, and as the monitoring duration increases, the monitoring accuracy of the system decreases. Furthermore, the most popular applications in embedded monitoring technology are dynamic weighing technologies, such as flexural plate type dynamic weighing systems and piezoelectric type dynamic weighing systems. These systems have very high requirements on the rigidity and the flatness of the pavement, and when the system is used on the asphalt pavement, the pavement needs to be modified, so that the construction and maintenance cost is increased.

In recent years, with the development of computer communication technology, internet technology, and sensing technology, researchers have developed MEMS sensors that can be applied to the field of road engineering. However, there are many challenges in applying the MEMS sensor to actual road monitoring, and short-term effects such as high temperature, humidity and corrosive environment in construction and long-term effects such as freeze-thaw cycles and vehicle loads in actual road structure must be considered, and communication and energy supply problems of the sensor must be considered. Through the prefabrication technology, before road surface pavement, with sensor and road structure perfect adaptation together, not only can avoid the sensor damage that the construction of roughness formula shop front leads to, can also the accurate control sensor lay position and energy communication component's protection encapsulation.

At present, the research on the technology is still little in China. It is highly desirable to provide a method for realizing the integration of fast maintenance and intelligent transportation technology.

Disclosure of Invention

To the defects and deficiencies in the prior art, the utility model provides a prefabricated carpet type intelligent asphalt pavement and a preparation method thereof. The method realizes the quick repair of the asphalt pavement, and analyzes the traffic information by monitoring the dynamic response of the pavement under the action of vehicle load.

An object of the utility model is to provide a prefabricated carpet formula intelligence bituminous paving, including crimpable asphalt concrete layer and at least one intelligence aggregate unit, intelligence aggregate unit is arranged in with the mode of embedding in the crimpable asphalt concrete layer. The utility model provides a prefabricated "carpet formula" bituminous paving layer of mating formation of mill can roll up and stack like rolling up the carpet after prefabricating, then lay the construction like spreading out the carpet during on-the-spot installation to hot mixing, transportation, process such as rolling and cooling in having avoided traditional bituminous paving maintenance process, realize the quick top facing restoration on road surface and open traffic rapidly. In addition, in the process of prefabricating the carpet type asphalt pavement, the sensor is embedded into the pavement structure in advance, and damage to the sensor and damage to the pavement caused by the construction of the rough pavement are avoided. The sensor-embedded asphalt pavement layer has a self-sensing function, can sense traffic flow information on a pavement, including vehicle speed, vehicle weight, vehicle type and the like, and can sense the internal state of the pavement layer structure, so that integrated monitoring and detection of vehicle information are realized.

According to some preferred embodiments of the present invention, each roll of the crimpable asphalt concrete layer has a length of 10m to 200m, a width of 0.1m to 3.75m, and a thickness of 25mm to 50 mm; preferably, the length is 10m to 50m, the width is 1m to 3.75m, and the thickness is 30mm to 40 mm.

According to some preferred embodiments of the present invention, the intelligent aggregate unit is cylindrical, or square or rectangular in shape, preferably cylindrical, with a diameter of 50-80mm and a height of 20-50 mm.

According to some preferred embodiments of the present invention, the intelligent aggregate units are uniformly arranged along the length direction of the crimpable asphalt concrete layer; preferably, the distance between the intelligent aggregate units is 200mm-500 mm.

According to some preferred embodiments of the present invention, the crimpable asphalt concrete layer is prepared by including the following raw materials in parts by weight: 4.5-12 parts of asphalt, 80-95 parts of mineral aggregate, 0.6-8 parts of modifier and 0.005-0.02 part of fiber; preferably 8 to 12 portions of asphalt, 82 to 90 portions of mineral aggregate, 5 to 8 portions of modifier and 0.01 to 0.02 portion of fiber; wherein the asphalt is base asphalt or SBS modified asphalt.

According to some preferred embodiments of the invention, the nominal maximum particle size of the mineral aggregate is 4.75mm, 9.5mm or 13.2mm, preferably 9.5 mm; the mineral aggregate is 100 percent of 13.2mm, 92 to 100 percent of 9.5mm, 60 to 70 percent of 4.75mm, 40 to 50 percent of 2.36mm, 20 to 30 percent of 1.18mm, 10 to 15 percent of 0.3mm, 5 to 10 percent of 0.15mm and 5 to 8 percent of 0.075 mm.

According to some preferred embodiments of the present invention, the modifier comprises a thermoplastic elastomer and a flow modifier, wherein the weight ratio of the thermoplastic elastomer to the flow modifier is 28-80:20-72, preferably 50-80: 20-50.

According to some preferred embodiments of the present invention, the thermoplastic elastomer is selected from one or more of SBS, POE, EVA and PO, preferably SBS, EVA 60-80: 20-40;

and/or the flow modifier is resin, wax and softener in a weight ratio of 25-55:4-12:8-30, preferably 40-50:4-8: 20-30.

According to some preferred embodiments of the present invention, the resin is a C5 or C9 petroleum resin, preferably a C5 petroleum resin; and/or the softener is selected from one or more of naphthenic oil, raffinate oil, rubber oil, tung oil, castor oil, corn oil, soybean oil, rapeseed oil, linseed oil, sunflower seed oil and palm oil; preferably naphthenic oil; and/or the wax is a saso wax and/or a PE wax, preferably a PE wax.

According to some preferred embodiments of the present invention, the mineral aggregate includes coarse aggregate, fine aggregate and mineral powder; wherein the coarse aggregate is basalt and/or glauconite; the fine aggregate is limestone; the mineral powder is limestone mineral powder; and/or the fibers are selected from one or more of lignin fibers, polyester fibers and basalt fibers.

According to some preferred embodiments of the present invention, the intelligent aggregate unit includes a sensing element, a power supply element, a calculation element, a communication element, and an encapsulation member provided outside. The utility model adopts the above-mentioned intelligence aggregate unit can realize the monitoring of road surface vibration and temperature, possesses resistance to compression, waterproof, low-power consumption, the characteristic of high accuracy, can realize the monitoring of speed of a motor vehicle, axletree, motorcycle type, traffic flow.

According to some preferred embodiments of the present invention, the sensing element includes a stress-strain sensor, an acceleration sensor, and a temperature-humidity sensor, and is configured to sense stress information, structural vibration information, and temperature-humidity information of the road surface; the power supply element adopts an integrated piezoelectric energy storage unit and a battery and is used for converting mechanical energy of vehicle load into electric energy and storing the electric energy, so that self-power supply of the unit is realized, and electric energy is provided for each component; the computing element adopts a microprocessor unit and is embedded with a preprocessing algorithm, so that filtering and denoising and characteristic value extraction of sensing data are realized, and an automatic communication triggering mechanism and an operation mode switching mechanism are realized; the communication element adopts a wireless radio frequency circuit technology and a low-frequency custom communication protocol to realize wireless communication of a local area and wirelessly transmits the data of the intelligent aggregate unit to a receiving device beside a road; the packaging part is made of cement-based materials and is used for protecting various components in the intelligent aggregate unit. The utility model discloses in, automatic communication trigger mechanism, be based on the consideration that reduces the energy consumption, communication element in the intelligence aggregate unit does not communicate with receiving equipment in real time, but when the vehicle passed through the road surface, produced the signal fluctuation under the vehicle load effect, trigger communication, intelligence aggregate unit with information transmission in the receiving equipment. The operation mode switching mechanism means that the intelligent aggregate unit has two modes of multi-dormancy and operation, and mode switching is performed according to time setting, wherein if the node is in the dormancy mode at night, the node is in the operation mode in the day.

The beneficial effects of the utility model reside in at least: the utility model discloses not only can shorten road surface maintenance time, alleviate the traffic jam, can also realize from perception function road surface technique simultaneously, realize intelligent road surface. The utility model discloses break through on material and technology, develop the high performance cementing material to combine carpet formula bituminous paving prefabricated technology, develop pre-buried intelligent sensor unit and data analytic algorithm. The method has the advantages of realizing quick repair of the asphalt pavement and intelligent perception of traffic information, greatly relieving traffic jam caused by road maintenance, realizing intelligent traffic and improving traffic transportation efficiency, and providing a technical platform for developing high-quality, high-performance and special-function pavements. Furthermore, the utility model discloses the road that possesses perception function, executive function, calculation function and communication function that develops uses intelligent sensor unit and pre-buried technology, can test sensitivity, durability and the energy consumption of evaluation sensor unit. The developed road surface dynamic response analysis algorithm analyzes the road surface dynamic response signals under the action of vehicle loads and acquires the state information of environment, traffic and road structures.

Drawings

Fig. 1 is a cross-sectional view of a prefabricated carpet type intelligent asphalt pavement provided by an embodiment of the present invention;

reference numerals: 1-intelligent aggregate unit and 2-lower layer.

Detailed Description

The following examples further illustrate the invention but are not to be construed as limiting the invention. Modifications or substitutions to methods, steps or conditions of the present invention may be made without departing from the spirit and substance of the invention.

Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art, and the materials used are all commercially available products.

The utility model discloses an among the embodiment, the preparation method of prefabricated carpet formula intelligence bituminous paving, including following step:

(1) mixing the raw materials of the crimpable asphalt concrete, uniformly stirring, and rolling to form a crimpable asphalt concrete layer;

(2) embedding the intelligent aggregate unit for the road into a prefabricated curlable asphalt concrete layer;

(3) winding the rollable asphalt concrete layer into a prefabricated carpet type intelligent asphalt surface layer roll;

(4) and forming the prefabricated carpet type intelligent asphalt pavement after paving.

Example 1

1) Mixed crimpable asphalt concrete raw material

1-A) preparation of the modifier

Preparing materials according to the following weight ratio:

the raw materials are mixed and then added into a double-screw extruder for melting and mixing, and then are extruded and granulated to obtain particles with the particle size of less than 3mm, namely the modifier.

Wherein the melting temperature is 120-160 ℃.

The styrene-butadiene-styrene copolymer elastomer in the embodiment is selected from the SBS 1301 in Yuanyang petrochemical form; ethylene-octene copolymer elastomer selection of the United statesDupont EVA 250; the resin is selected from Lanzhou petrochemical C₅Petroleum resin; selecting the wax from industrial grade PE wax of New Material Co., Ltd, Roland, Yangzhou; the softening agent is KN4010 naphthenic oil of a Clarity refinery.

1-B) preparing the following raw materials in parts by weight:

modifier 8 aggregate and filler 82

Esso base asphalt 10 polyester fiber 0.02

In the embodiment, the aggregate consists of coarse aggregate and fine aggregate, and basalt is selected as the coarse aggregate; limestone is selected as the fine aggregate; limestone mineral powder is selected as the filler.

Wherein the nominal maximum particle size of the aggregate is 9.5mm, and the gradation of the aggregate and the filler is shown in the following table 1:

TABLE 1 mineral aggregate gradation table

Screen hole (mm)	13.5	9.5	4.75	2.36	1.18	0.6	0.3	0.15	0.075
										Passage Rate (%)	100	96	65	45	25	15	12	7	5

1-C) under the stirring condition, mixing the modifier with the preheated aggregate, and uniformly stirring to form a first mixed material; wherein the stirring temperature is 165 ℃ and the stirring time is 25 s.

1-D) adding liquid esomeprazole base asphalt into the first mixed material, and uniformly stirring to form a second mixed material; wherein the stirring temperature is 165 ℃ and the stirring time is 50 s.

1-E) adding fibers into the second mixed material, and uniformly stirring to form a third mixed material; wherein the stirring temperature is 165 ℃ and the stirring time is 50 s.

1-F) adding a filler into the third mixed material, and uniformly stirring to obtain the material. Wherein the stirring temperature is 165 ℃ and the stirring time is 85 s.

2) Intelligent aggregate unit for preparing roads

The intelligent aggregate unit is characterized in that a core component of the intelligent aggregate unit is a PCB, the PCB is provided with an MEMS acceleration sensor (ADX 85103), an AD analog-to-digital converter (AD7689), a microprocessor (STM 32L) and a wireless communication module (APC340, radio frequency IC: SX1278 chip).

3) Intelligent aggregate unit for preparing prefabricated asphalt concrete surface layer roll and pre-buried road

3-A) paving the crimpable asphalt concrete prepared in the step 1); wherein the temperature of the paving treatment is 140 ℃;

3-B) marking the paved curlable asphalt concrete surface layer roll, and determining the pre-buried position of the intelligent aggregate unit;

3-C) laying the intelligent aggregate units prepared in the step 2) to a specified position, and packaging the intelligent aggregate units by adopting a cement-based material.

3-D) rolling and paving the curlable asphalt concrete on the prefabricated asphalt concrete surface layer, and sequentially carrying out primary pressing, secondary pressing and final pressing to obtain the curlable asphalt concrete layer embedded with the intelligent aggregate units; wherein the initial pressure temperature is 130 ℃; the temperature of the repressing is 110 ℃; the temperature of the final pressure was 50 ℃.

3-E) adopting special curling equipment to curl the curlable asphalt concrete layer to obtain the prefabricated asphalt concrete surface layer roll. Wherein the curling temperature is 10 ℃ and the curling speed is 0.5 m/min.

3-F) rolling and packing the prefabricated asphalt concrete surface layer, storing the prefabricated asphalt concrete surface layer in a shade place, and covering tarpaulin, waterproof cloth and the like for standby. In the embodiment, each roll of the precast asphalt concrete surface layer is 10m long, 1m wide and 30mm thick. As can be seen from fig. 1, in the section of the prefabricated carpet type intelligent asphalt pavement provided by the embodiment, the intelligent aggregate 1 is embedded into the lower surface layer 2, i.e. the asphalt concrete layer can be curled. The intelligent aggregate unit is cylindrical, the diameter of the intelligent aggregate unit is 50mm, the height of the intelligent aggregate unit is 20mm, and the intelligent aggregate unit is embedded into the curlable asphalt concrete layer along the high direction of the intelligent aggregate unit. The intelligent aggregate units are uniformly arranged along the length direction of the crimpable asphalt concrete layer; the distance between the intelligent aggregate units is 200 mm.

Example 2

The method was the same as in example 1 except that the asphalt was changed to SBS modified asphalt, which was different from example 1.

Example 3

The procedure of example 1 was repeated, except that the gradation was such that the maximum nominal particle diameter was 4.75mm (the gradation of the mineral aggregate is shown in Table 2), in contrast to example 1.

TABLE 2 mineral aggregate gradation table

Screen hole (mm)	9.5	4.75	2.36	1.18	0.6	0.3	0.15	0.075
									Passage Rate (%)	100	75	55	35	25	18	12	7

Comparative example 1

And (3) carrying out mixture forming by using No. 70 matrix asphalt and AC-13 gradation, and carrying out on-site excavation to carry out intelligent aggregate units for the pre-buried roads.

Experimental example 1

The asphalt mixtures prepared in comparative example 1 and examples 1 to 3 were prepared into test pieces by the method of test procedures for road engineering asphalt and asphalt mixtures (JTG E20-2011), and the test results are shown in table 3. The data collected are shown in tables 4 and 5.

Table 3 results of performance testing

TABLE 4 vehicle speed and wheelbase monitoring (comparative example 1)

TABLE 5 vehicle speed and wheelbase monitoring (example)

The measurement result shows that: compared with the comparative example, the utility model discloses the performance of the prefabricated carpet formula bituminous mixture of preparation is showing and is improving: the maximum load can reach 5350N; the dynamic stability reaches 5769 times/mm; the Marshall stability reached 17.4 kN. The compressive strength of the intelligent aggregate unit can reach 67.54Mpa, and the intelligent aggregate unit can completely bear the load of an actual vehicle. The intelligent aggregate unit can realize the monitoring of the vehicle speed and the wheel base, the calculated value is basically consistent with the measured value, the error in the conventional pavement can be controlled within 4 percent, and in the prefabricated asphalt pavement, the error can be controlled within 2 percent due to the improvement of the construction precision. The utility model discloses the fibre bituminous mixture that can curl of preparation has good fatigue resistance, high temperature resistance, resistance to deformation. The intelligent aggregate unit can be customized according to different actual requirements, the packaging method can bear the vehicle load of an actual road, and the precision is improved by 50%.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims (16)

1. The prefabricated carpet type intelligent asphalt pavement is characterized by comprising a crimpable asphalt concrete layer and at least one intelligent aggregate unit, wherein the intelligent aggregate unit is embedded in the crimpable asphalt concrete layer.

2. The prefabricated carpet type intelligent asphalt pavement according to claim 1, wherein each roll of the crimpable asphalt concrete layer has a length of 10-200 m, a width of 0.1-3.75 m and a thickness of 25-50 mm.

3. The prefabricated carpet type intelligent asphalt pavement according to claim 2, wherein each roll of the crimpable asphalt concrete layer has a length of 10-50 m, a width of 1-3.75 m and a thickness of 30-40 mm.

4. The prefabricated carpet type intelligent asphalt pavement according to claim 1, wherein the intelligent aggregate units are cylindrical, square or rectangular.

5. The prefabricated carpet type intelligent asphalt pavement as claimed in claim 4, wherein the intelligent aggregate unit is cylindrical, and has a diameter of 50-80mm and a height of 20-50 mm.

6. The prefabricated carpet type intelligent asphalt pavement according to any one of claims 1 to 5, wherein the intelligent aggregate units are uniformly arranged along the length direction of the crimpable asphalt concrete layer.

7. The prefabricated carpet type intelligent asphalt pavement according to claim 6, wherein the distance between the intelligent aggregate units is 200mm-500 mm.

8. The prefabricated carpet type intelligent asphalt pavement according to any one of claims 1 to 5, wherein the crimpable asphalt concrete layer comprises the following raw materials in parts by weight: 4.5-12 parts of asphalt, 80-95 parts of mineral aggregate, 0.6-8 parts of modifier and 0.005-0.02 part of fiber;

and/or the nominal maximum particle size of the mineral aggregate is 4.75mm, 9.5mm or 13.2 mm.

9. The precast carpet intelligent asphalt pavement of claim 8, wherein the nominal maximum particle size of the mineral aggregate is 9.5 mm; the mineral aggregate is prepared from 100 percent of 13.2mm, 92-100 percent of 9.5mm, 60-70 percent of 4.75mm, 40-50 percent of 2.36mm, 20-30 percent of 1.18mm, 10-15 percent of 0.3mm, 5-10 percent of 0.15mm and 5-8 percent of 0.075 mm.

10. The pre-fabricated carpet smart asphalt pavement of claim 8 wherein the modifier comprises a thermoplastic elastomer and a flow modifier, wherein the weight ratio of the thermoplastic elastomer to the flow modifier is 28-80: 20-72.

11. The pre-fabricated carpet smart asphalt pavement of claim 10 wherein the weight ratio of the thermoplastic elastomer to the flow modifier is 50-80: 20-50.

12. The pre-fabricated carpet smart asphalt pavement of claim 10 wherein the thermoplastic elastomer is selected from one or more of SBS, POE, EVA and PO;

and/or the flow modifier is resin, wax and softener in a weight ratio of 25-55:4-12: 8-30.

13. The prefabricated carpet type intelligent asphalt pavement according to claim 12, wherein the thermoplastic elastomer is SBS (ethylene vinyl acetate) EVA (ethylene vinyl acetate) 60-80: 20-40;

and/or the flow modifier is resin, wax and softener in a weight ratio of 40-50:4-8: 20-30.

14. The prefabricated carpet type intelligent asphalt pavement according to claim 8, wherein the mineral aggregate comprises coarse aggregate, fine aggregate and mineral powder; wherein the coarse aggregate is basalt and/or glauconite; the fine aggregate is limestone; the mineral powder is limestone mineral powder; and/or the fibers are selected from one or more of lignin fibers, polyester fibers and basalt fibers.

15. The prefabricated intelligent asphalt pavement as claimed in any one of claims 1 to 5, wherein the intelligent aggregate unit comprises a sensing element, a power supply element, a computing element, a communication element and an externally provided encapsulation member.

16. The prefabricated carpet type intelligent asphalt pavement according to claim 15, wherein the sensing elements comprise a stress strain sensor, an acceleration sensor and a temperature and humidity sensor, and are used for sensing stress information, structural vibration information and temperature and humidity information of the pavement;

the power supply element adopts an integrated piezoelectric energy storage unit and a battery and is used for converting mechanical energy of vehicle load into electric energy and storing the electric energy, so that self-power supply of the unit is realized, and electric energy is provided for each component;

the computing element adopts a microprocessor unit and is embedded with a preprocessing algorithm, so that filtering and denoising and characteristic value extraction of sensing data are realized, and an automatic communication triggering mechanism and an operation mode switching mechanism are realized;

the communication element adopts a wireless radio frequency circuit technology and a low-frequency custom communication protocol to realize wireless communication of a local area and wirelessly transmits the data of the intelligent aggregate unit to a receiving device beside a road;

the packaging part is made of cement-based materials and is used for protecting various components in the intelligent aggregate unit.

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