An integrated road surface self-generating device and its preparation method

Abstract

The present invention belongs to the field of green energy collection and utilization in road engineering, and specifically relates to an integrated pavement self-generating device and a preparation method thereof. The preparation method is: 1) using piezoelectric materials, matrix materials, water and admixtures to prepare piezoelectric aggregates; 2) using waste soil, cement, piezoelectric aggregates, water and admixtures used in engineering construction to prepare piezoelectric dynamic cement soil fillers; 3) laying the lower insulation layer, burying the wires, pouring the piezoelectric dynamic cement soil fillers and curing them to the designed age, and then laying the upper insulation layer and waterproof layer, and then connecting the wires to the piezoelectric energy recovery and storage device to obtain an integrated pavement self-generating device. The technical solution of the present invention is low-cost and green and environmentally friendly. It can be used to power equipment such as engineering inspection, temporary lighting, and safety monitoring of construction projects in remote areas. It is of great significance to promote energy collection and reuse in the field of highway transportation construction, and carbon peak and carbon neutrality in the construction industry.

Description

Technical Field

[0001] The present invention belongs to the field of green energy collection and utilization in road engineering, and specifically relates to an integrated road surface self-generating device and a preparation method thereof. Background Art

[0002] With rapid socioeconomic development, energy consumption and demand are increasing worldwide, while traditional fossil fuels are becoming increasingly depleted. Coupled with the impacts of global warming and environmental pollution, many countries have long incorporated the development of clean and renewable energy and energy conservation into their energy strategies. This means maximizing the use of clean and renewable energy (such as hydropower, solar energy, wind energy, biomass energy, and tidal energy) and recyclable energy (such as geothermal energy, waste heat, exhaust gas, and mechanical vibration energy). Statistics show that China's overall energy efficiency is only 33%, significantly lower than that of developed countries. There is a serious imbalance between China's energy growth and consumption rates, resulting in significant potential for energy conservation. Developing relevant scientific and technological fields to replace traditional energy with new energy has become an inevitable choice. Increasing efforts to recycle and reuse various energies and improving energy efficiency are effective ways to address China's energy challenges.

[0003] The pavement experiences stress, strain, displacement, and vibration under the action of vehicles. These responses generate strain energy, which can be converted into electrical energy for recycling through the piezoelectric effect. However, existing piezoelectric pavements primarily consist of piezoelectric components embedded in a secondary excavation after the concrete slab is poured. This results in poor interoperability between the piezoelectric components and the concrete matrix, and low energy collection efficiency. Therefore, there is an urgent need for a pavement self-generating device that is simple to manufacture, features well-coordinated components, and high energy conversion efficiency. Summary of the Invention

[0004] In response to the problems existing in the prior art, the purpose of the present invention is to provide an integrated self-generating pavement power generation device and its preparation method, so as to solve the problems that the existing piezoelectric pavement requires secondary excavation, and there are also problems such as poor coordination between piezoelectric devices and base concrete, and low energy collection efficiency.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] The present invention provides a method for preparing an integrated road surface self-generating device, comprising the following steps:

[0007] 1) mixing the piezoelectric material and the matrix material, ultrasonically dispersing the mixture to obtain a dry powder, adding water and an admixture to obtain a uniform composite, vacuum curing the uniform composite, crushing it into particles, and then polarizing it to obtain the piezoelectric aggregate;

[0008] 2) mixing construction waste soil, cement and piezoelectric aggregate and dry-mixing them, then adding water and admixtures to obtain a piezoelectric cement soil filler (101);

[0009] 3) After laying the lower insulating layer (102), the electric wire (106) is buried, the piezoelectric dynamic cement soil filler (101) is poured and maintained to the designed age, and then the upper insulating layer (103) and the waterproof layer (104) are laid, and then the electric wire (106) is connected to the piezoelectric energy recovery and storage device (105) to obtain an integrated road surface self-generating device.

[0010] Preferably, the raw materials in step 1) are calculated in parts by weight as follows: 50-65 parts of piezoelectric material, 10-20 parts of matrix material, 15-30 parts of water, and 7-11 parts of admixture; the piezoelectric aggregate is a 0-3 type piezoelectric composite material with a particle size of 5-25 mm.

[0011] Preferably, in step 1), the ultrasonic frequency of ultrasonic dispersion is 19-30 kHz; the vacuum degree of vacuum curing is 20-75 kPa, and the curing time is 3-28 days; the polarization method is thermal polarization method, and the conditions are: polarization temperature is 70-120°C, polarization voltage is 2-5 kV / mm, and polarization time is 20-50 min.

[0012] Preferably, the piezoelectric material is in powder form, comprising lead zirconate titanate piezoelectric ceramics, barium zirconate titanate piezoelectric ceramics or lead zirconate titanate piezoelectric ceramics modified with carbon nanotubes; the matrix material comprises cement, fly ash or blast furnace slag.

[0013] Preferably, in step 2), the raw materials are calculated in parts by weight as follows: 30-50 parts of waste soil for construction, 5-20 parts of cement, 15-30 parts of water, 20-30 parts of piezoelectric aggregate, and 1-5 parts of admixture.

[0014] Preferably, the admixture in step 1) comprises one or more of sodium aluminate, potassium aluminate and calcium aluminate; and the admixture in step 2) comprises one or more of polycarboxylate water reducer, calcium formate early strength agent, air-entraining pumping agent, calcium oxide expansion agent and polyether defoaming agent.

[0015] Preferably, in step 3), the upper insulating layer (103) and the lower insulating layer (102) are made of rubber and have an independent thickness of 5 to 20 mm; the waterproof layer (104) is an epoxy resin modified asphalt waterproof coating and has a thickness of 1 to 5 mm.

[0016] Preferably, in step 3), the curing conditions are a temperature of 5 to 50° C. and a relative humidity of 90% to 97%; the design age is 3 to 28 days; and after curing to the design age, the strength of the piezoelectric cement soil filler (101) is 0.2 to 1.0 MPa.

[0017] Preferably, in step 3), the piezoelectric energy recovery and storage device (105) is distributed on both sides of the road along the road direction, and the interval between two adjacent piezoelectric energy recovery and storage devices (105) is 1000 to 2000 m; the piezoelectric energy recovery and storage device (105) includes a primary energy storage element supercapacitor, a secondary energy storage element battery and a DC / DC voltage converter.

[0018] Another object of the present invention is to provide an integrated pavement self-generating device prepared by the preparation method, wherein the integrated pavement self-generating device comprises a piezoelectric cement-soil filler (101), a lower insulating layer (102), an upper insulating layer (103), a waterproof layer (104), a piezoelectric energy recovery and storage device (105) and an electric wire (106).

[0019] The purpose of using fluidized cement soil in the present invention is that fluidized cement soil has strong fluidity, fast construction speed, adjustable strength, lower modulus than traditional concrete panels, and will generate greater deformation and strain energy when vehicles pass through than traditional concrete panels. It is a high-potential subgrade for pressurized road surfaces.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention takes into account the characteristics of fluidized cement soil, such as fast construction speed, adjustable strength and low cost, and comprehensively considers vehicle load, environmental conditions and material properties, to provide an integrated pavement self-generating device based on fluidized cement soil. It does not require secondary excavation to bury piezoelectric devices, has a simple preparation method, and has a fast setting speed. The present invention crushes 0-3 type cement-based piezoelectric composite materials into piezoelectric aggregates, disperses them in fluidized cement soil, and casts them into a pavement. The entire pavement is a power generation device, which can collect more electricity and can be used to power engineering inspection, temporary lighting, security monitoring and other equipment for construction projects in remote areas. It is low-cost, green and environmentally friendly, and is of great significance to promoting energy collection and reuse in the field of highway transportation construction and carbon peak and carbon neutrality in the construction industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The diagram is a structural diagram of an integrated pavement self-generating device based on piezoelectric cement soil.

[0023] Legend: 101, piezoelectric dynamic cement soil filler; 102, lower insulation layer; 103, upper insulation layer; 104, waterproof layer; 105, piezoelectric energy recovery and storage device; 106, electric wire. DETAILED DESCRIPTION

[0024] The present invention provides a method for preparing an integrated road surface self-generating device, comprising the following steps:

[0025] 1) mixing the piezoelectric material and the matrix material, ultrasonically dispersing the mixture to obtain a dry powder, adding water and an admixture to obtain a uniform composite, vacuum curing the uniform composite, crushing it into particles, and then polarizing it to obtain the piezoelectric aggregate;

[0026] 2) mixing construction waste soil, cement and piezoelectric aggregate and dry-mixing them, then adding water and admixtures to obtain a piezoelectric cement soil filler (101);

[0027] 3) After laying the lower insulating layer (102), burying the electric wire (106), pouring the piezoelectric dynamic cement soil filler (101) and curing it to the designed age, laying the upper insulating layer (103) and the waterproof layer (104) after the piezoelectric dynamic cement soil filler (101) solidifies, and then connecting the electric wire (106) to the piezoelectric energy recovery and storage device (105) to obtain an integrated road surface self-generating device.

[0028] In the present invention, in step 1), the amount of each raw material added is preferably 50 to 65 parts by weight, more preferably 52 to 62 parts, and more preferably 55 to 60 parts; the amount of the matrix material added is preferably 10 to 20 parts, more preferably 12 to 18 parts, and more preferably 14 to 16 parts; the amount of water added is preferably 15 to 30 parts, more preferably 18 to 25 parts, and more preferably 20 to 22 parts; the amount of the admixture added is preferably 7 to 11 parts, more preferably 8 to 10 parts, and more preferably 9 to 10 parts;

[0029] In the present invention, the piezoelectric aggregate in step 1) is a 0-3 type piezoelectric composite material, and the particle size is preferably 5 to 25 mm, more preferably 10 to 20 mm, and even more preferably 12 to 18 mm.

[0030] In the present invention, in step 1), the ultrasonic frequency of ultrasonic dispersion is preferably 19 to 30 kHz, more preferably 21 to 27 kHz, and even more preferably 25 to 26 kHz.

[0031] In the present invention, in step 1), after adding water and additives, the mixture is preferably stirred to obtain a uniform composite. The stirring time is preferably 5 to 10 minutes, more preferably 6 to 9 minutes, and even more preferably 7 to 8 minutes.

[0032] In the present invention, in step 1), vacuum treatment is preferably performed before vacuum curing, and the vacuum treatment time is preferably 5 to 10 minutes, more preferably 6 to 9 minutes, and more preferably 7 to 8 minutes; the vacuum degree of vacuum curing is preferably 20 to 75 kPa, more preferably 35 to 70 kPa, and more preferably 40 to 65 kPa; the curing time is preferably 3 to 28 days, more preferably 5 to 25 days, and more preferably 10 to 20 days.

[0033] In the present invention, in step 1), the polarization method is thermal polarization, and the polarization temperature is preferably 70-120°C, more preferably 90-115°C, and more preferably 100-110°C; the polarization voltage is preferably 2-5 kV / mm, more preferably 2.5-4 kV / mm, and more preferably 3-3.5 kV / mm; the polarization time is preferably 20-50 min, more preferably 25-40 min, and more preferably 30-35 min.

[0034] In the present invention, the piezoelectric material is in powder form and includes lead zirconate titanate piezoelectric ceramics (PZT), barium zirconate titanate piezoelectric ceramics (BZT) or PZT modified by carbon nanotubes; the matrix material includes cement, fly ash or blast furnace slag.

[0035] In the present invention, the additive in step 1) comprises one or more of sodium aluminate, potassium aluminate and calcium aluminate.

[0036] In the present invention, in step 2), the dry mixing time is preferably 0.5 to 1.5 min, preferably 0.8 to 1.2 min, and more preferably 1 min.

[0037] In the present invention, in step 2), the method of mixing to obtain the piezoelectric dynamic cement soil filler is preferably stirring, and the stirring time is preferably 1.5 to 3 minutes, more preferably 1.8 to 2.5 minutes, and even more preferably 2 to 2.2 minutes.

[0038] In the present invention, in step 2), the amount of each raw material added is preferably 30 to 50 parts by weight, more preferably 35 to 45 parts, and more preferably 38 to 42 parts; the amount of cement added is preferably 5 to 20 parts, more preferably 8 to 16 parts, and more preferably 10 to 14 parts; the amount of water added is 15 to 30 parts, more preferably 18 to 26 parts, and more preferably 20 to 24 parts; the amount of piezoelectric aggregate added is 20 to 30 parts, more preferably 22 to 28 parts, and more preferably 24 to 26 parts; the amount of admixture added is 1 to 5 parts, more preferably 2 to 4 parts, and more preferably 3 to 4 parts;

[0039] In the present invention, the admixture in step 2) comprises one or more of a polycarboxylate water-reducing agent, a calcium formate early strength agent, an air-entraining pumping agent, a calcium oxide expansion agent, and a polyether defoaming agent.

[0040] In the present invention, in step 3), the upper insulating layer (103) and the lower insulating layer (102) are made of rubber material, and their thickness is preferably 5 to 20 mm, more preferably 8 to 16 mm, and more preferably 10 to 14 mm; the waterproof layer (104) is an epoxy resin modified asphalt waterproof coating, and its thickness is preferably 1 to 5 mm, more preferably 2 to 4 mm, and more preferably 3 to 4 mm.

[0041] In the present invention, in step 3), the curing conditions are preferably a temperature of 5 to 50° C., more preferably 10 to 40° C., and more preferably 20 to 30° C.; the relative humidity is preferably 90% to 97%, more preferably 92% to 96%, and more preferably 93% to 95%; after curing to the design age, the strength of the piezoelectric cement soil filler (101) is preferably 0.2 to 1.0 MPa, more preferably 0.3 to 0.9 MPa, and more preferably 0.5 to 0.8 MPa.

[0042] In the present invention, the piezoelectric energy recovery and storage device (105) is distributed on both sides of the road along the road direction, and the interval between two adjacent piezoelectric energy recovery and storage devices (105) is preferably 1000 to 2000 m, more preferably 1200 to 1800 m, and more preferably 1400 to 1600 m; the piezoelectric energy recovery and storage device (105) includes a primary energy storage element supercapacitor, a secondary energy storage element battery and a DC / DC voltage converter. The use of this device can improve the energy storage efficiency and stabilize the output voltage.

[0043] Another object of the present invention is to provide an integrated pavement self-generating device prepared by the preparation method, wherein the integrated pavement self-generating device comprises a piezoelectric cement-soil filler (101), a lower insulating layer (102), an upper insulating layer (103), a waterproof layer (104), a piezoelectric energy recovery and storage device (105) and an electric wire (106).

[0044] The technical solutions provided by the present invention are described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0045] Example 1

[0046] 1) Weigh 55 parts of lead zirconate titanate piezoelectric ceramic PZT powder and 20 parts of cement by weight, stir them evenly, and ultrasonically disperse them at a frequency of 25 kHz for 2 hours to obtain a mixed dry powder, add 20 parts of water and 7 parts of sodium aluminate, and stir for 5 minutes to obtain a uniform composite, place the uniform composite in a mold, evacuate it at a vacuum degree of 50 kPa for 5 minutes, and then place it in a curing box for curing for 3 days. After solidification and molding, take it out and crush it into 15 mm particles, and then polarize it using a hot electrode method at a polarization temperature of 80° C., a polarization voltage of 2.5 kV / mm, and a polarization time of 25 minutes to obtain a piezoelectric aggregate for later use;

[0047] 2) According to the "Cement-Soil Mix Design Code" (JCJ / T233-2011), 40 parts by weight of construction waste soil, 10 parts of cement, and 30 parts of piezoelectric aggregate were weighed and mixed and dry-mixed for 0.5 min to evenly disperse the piezoelectric aggregate in the soil and cement. 20 parts of water, 1 part of a polycarboxylate water reducer (HWR-AQ017, Shaanxi Qinfen Building Materials Co., Ltd.), and 2 parts of a calcium formate early strength agent (Jinan Xingjian Biotechnology Co., Ltd.) were then added and stirred evenly for 1.5 min to obtain a piezoelectric dynamic cement-soil filler.

[0048] 3) Lay a 5mm rubber lower insulation layer, bury the wires, pour the piezoelectric dynamic cement soil filler, and maintain it at a temperature of 10°C and a relative humidity of 90% for 5 days to allow the piezoelectric dynamic cement soil filler to solidify (strength of 0.3MPa). Then lay a 5mm rubber upper insulation layer and a 2mm epoxy resin modified asphalt waterproof coating waterproof layer, and use wires to connect them to the piezoelectric energy recovery and storage device. The adjacent piezoelectric energy recovery and storage devices are spaced 1000m apart.

[0049] Example 2

[0050] 1) Weigh 60 parts by weight of lead zirconate titanate piezoelectric ceramic PZT powder and 15 parts of cement, stir them evenly, and ultrasonically disperse them at a frequency of 30 kHz for 3 hours to obtain a mixed dry powder, add 15 parts of water and 10 parts of potassium aluminate, and stir for 10 minutes to obtain a uniform composite, place the uniform composite in a mold, evacuate it at a vacuum degree of 75 kPa for 10 minutes, and then place it in a curing box for curing for 7 days. After solidification and molding, take it out and crush it into 20 mm particles, and then polarize it using a hot electrode method at a polarization temperature of 90° C., a polarization voltage of 3 kV / mm, and a polarization time of 30 minutes to obtain a piezoelectric aggregate for later use;

[0051] 2) According to the "Cement-Soil Mix Design Code" (JCJ / T233-2011), 45 parts by weight of construction waste soil, 10 parts by weight of cement, and 25 parts by weight of piezoelectric aggregate were weighed and mixed and dry-mixed for 1 minute to evenly disperse the piezoelectric aggregate in the soil and cement. 15 parts by weight of water, 1.5 parts by weight of a polycarboxylate water-reducing agent (HWR-AQ017, Shaanxi Qinfen Building Materials Co., Ltd.), and 3.5 parts by weight of an air-entraining pumping agent (Jinan Dewen Chemical Co., Ltd.) were then added and stirred evenly for 1.5 minutes to obtain a piezoelectric dynamic cement-soil filler.

[0052] 3) Lay a 10mm rubber lower insulation layer, bury the wires, pour the piezoelectric dynamic cement soil filler, and maintain it at a temperature of 30°C and a relative humidity of 95% for 20 days to allow the piezoelectric dynamic cement soil filler to solidify (strength of 0.7MPa). Then lay a 10mm rubber insulation layer and a 2mm epoxy resin modified asphalt waterproof coating waterproof layer, and use wires to connect them to the piezoelectric energy recovery and storage device. The adjacent piezoelectric energy recovery and storage devices are spaced 1500m apart.

[0053] Example 3

[0054] 1) Weigh 50 parts by weight of lead zirconate titanate piezoelectric ceramic PZT powder and 10 parts of cement, stir them evenly, and ultrasonically disperse them at a frequency of 20 kHz for 2.5 hours to obtain a mixed dry powder, add 30 parts of water and 10 parts of calcium aluminate, and stir for 7 minutes to obtain a uniform composite, place the uniform composite in a mold, evacuate it at a vacuum degree of 60 kPa for 8 minutes, and then place it in a curing box for curing for 28 days. After solidification and molding, take it out and crush it into 10 mm particles, and then polarize it using a hot electrode method at a polarization temperature of 110° C., a polarization voltage of 5 kV / mm, and a polarization time of 50 minutes to obtain a piezoelectric aggregate for later use;

[0055] 2) According to the "Cement-Soil Mix Design Code" (JCJ / T233-2011), 48 parts by weight of construction waste soil, 18 parts of cement, and 20 parts of piezoelectric aggregate were weighed and mixed and dry-mixed for 1.5 minutes to evenly disperse the piezoelectric aggregate in the soil and cement. Then, 20 parts of water, 1 part of calcium formate early strength agent (Jinan Xingjian Biotechnology Co., Ltd.), 1 part of air-entraining pumping agent (Jinan Dewen Chemical Co., Ltd.), and 1 part of calcium oxide expansion agent (HP-CSA high-performance concrete expansion agent, Shenzhen Beisike New Materials Co., Ltd.) were added and evenly stirred for 3 minutes to obtain a piezoelectric dynamic cement soil filler.

[0056] 3) Lay a 20mm lower insulating layer of rubber material, bury the wires, pour the piezoelectric dynamic cement soil filler, and maintain it for 15 days under the conditions of an Aqi temperature of 20°C and a relative humidity of 94% to allow the piezoelectric dynamic cement soil filler to solidify (the strength is 0.6MPa). Then lay a 20mm upper insulating layer of rubber material and a 5mm epoxy resin modified asphalt waterproof coating waterproof layer, and use wires to connect them to the piezoelectric energy recovery and storage device. The adjacent piezoelectric energy recovery and storage devices are spaced 2000m apart.

[0057] Example 4

[0058] 1) Weigh 65 parts of lead zirconate titanate piezoelectric ceramic PZT powder and 15 parts of cement by weight, stir them evenly, and ultrasonically disperse them at a frequency of 19 kHz for 2 hours to obtain a mixed dry powder, add 25 parts of water and 11 parts of sodium aluminate accelerator, and stir for 8 minutes to obtain a uniform composite, place the uniform composite in a mold, evacuate it at a vacuum degree of 20 kPa for 7 minutes, and then place it in a curing box for curing for 15 days. After solidification and molding, take it out and crush it into 5 mm particles, and then polarize it using a hot electrode method at a polarization temperature of 120° C., a polarization voltage of 2 kV / mm, and a polarization time of 20 minutes to obtain a piezoelectric aggregate for later use;

[0059] 2) According to the "Cement-Soil Mix Design Code" (JCJ / T233-2011), 30 parts by weight of construction waste soil, 5 parts of cement, and 25 parts of piezoelectric aggregate were weighed and mixed and dry-mixed for 1 minute to evenly disperse the piezoelectric aggregate in the soil and cement. Then, 50 parts of water, 2 parts of polycarboxylate water reducer (HWR-AQ017, Shaanxi Qinfen Building Materials Co., Ltd.), 1 part of calcium oxide expansion agent (HP-CSA high-performance concrete expansion agent, Shenzhen Besco New Materials Co., Ltd.), and 1 part of polyether defoamer (P80A, Shenzhen Besco New Materials Co., Ltd.) were added and evenly stirred for 2 minutes to obtain a piezoelectric dynamic cement soil filler;

[0060] 3) Lay a 15mm rubber lower insulation layer, bury the wires, pour the piezoelectric dynamic cement soil filler, and maintain it at a temperature of 50°C and a relative humidity of 96% for 28 days to allow the piezoelectric dynamic cement soil filler to solidify (strength of 1.0 MPa). Then lay a 15mm rubber upper insulation layer and a 4mm epoxy resin modified asphalt waterproof coating waterproof layer, and use wires to connect them to the piezoelectric energy recovery and storage device. The adjacent piezoelectric energy recovery and storage devices are spaced 1800m apart.

[0061] In the above-mentioned embodiments 1-4, the piezoelectric aggregate is evenly distributed in the fluid cement soil, and the electric wires are led out to the outside of the road surface when the piezoelectric fluid cement soil is poured.

[0062] In the above-mentioned embodiments 1-4, the piezoelectric energy recovery and storage devices are evenly distributed along the road surface direction, and the piezoelectric energy recovery and storage devices can be connected in series or in parallel.

[0063] The integrated pavement self-generating device based on piezoelectric cement-soil filler prepared in Example 1 was subjected to the following test to test its ability to collect vibration piezoelectric energy.

[0064] Test Example 1

[0065] The conditions of this test example are: the modulus of the piezoelectric cement soil is the same, the weight percentage of the piezoelectric aggregate is the same, and the axle load tire pressure is different.

[0066] Indoor testing was conducted using piezoelectric cement soil with a modulus of 600 MPa. 25 parts by weight of piezoelectric aggregate were cast into piezoelectric cement soil. This was then poured into a rutting plate test mold. After curing for 3 days, the rutting plate specimen, along with the mold, was placed on the test bench of a rutting test machine. The test wheel could be positioned anywhere on the rutting plate, with the running direction consistent with the driving direction. The positive and negative poles of the road surface were connected to the output terminals through the lead wires. The rutting test machine was started, and the test wheel was driven back and forth. Rubber tires with tire pressures of 0.7 MPa, 0.95 MPa, and 1.17 MPa (corresponding to axle loads of 100 kN, 160 kN, and 220 kN for a single-axle, dual-wheel set, respectively) were used to run over the rutting plate. Three parallel tests were performed for each parameter. If there was no variation, the average value was taken. When the output end is connected to an oscilloscope, the maximum peak voltages are 56V, 77V, and 87V respectively, which meet the power supply requirements of engineering monitoring, temporary lighting, security monitoring and other equipment in construction projects in remote areas.

[0067] Test Example 2

[0068] The conditions of this test example are: the modulus of the piezoelectric cement soil is the same, the weight percentage of the piezoelectric aggregate is different, and the axle load tire pressure is the same.

[0069] Indoor testing was conducted using piezoelectric cement-soil with a modulus of 600 MPa. 20, 25, and 30 parts by weight of piezoelectric aggregate were used to form the piezoelectric cement-soil. The piezoelectric cement-soil was then cast into a rutting plate test mold. After three days of curing, the rutting plate specimen, along with the mold, was placed on the test bench of a rutting test machine. The test wheel could be positioned anywhere on the rutting plate, with the running direction aligned with the vehicle's direction of travel. The positive and negative poles of the road surface were connected to the output terminals via lead wires. The rutting test machine was started, and the test wheel was driven back and forth, using rubber tires with a tire pressure of 0.7 MPa to roll over the rutting plate. Three parallel tests were performed for each parameter, and the average value was taken if no variation was observed. The output terminal was connected to an oscilloscope, and the maximum peak voltages were 47V, 56V, and 71V, respectively, meeting the power requirements for engineering monitoring, temporary lighting, and security monitoring equipment in remote construction projects.

[0070] Test Example 3

[0071] The conditions of this test example are: different moduli of the piezoelectric cement soil, the same weight percentage of the piezoelectric aggregate, and the same axle load tire pressure.

[0072] Indoor tests were conducted using piezoelectric cement-soil with moduli of 400 MPa, 600 MPa, and 800 MPa, respectively. Three replicate tests were performed for each parameter, and the average value was used if no variation was observed. 25 parts by weight of piezoelectric aggregate were cast into piezoelectric cement-soil. This piezoelectric cement-soil was then poured into a rutting plate test mold and cured for 3 days. The rutting plate specimen, along with the mold, was then placed on the test bench of a rutting test machine. The test wheel could be positioned anywhere on the rutting plate, with the running direction aligned with the vehicle's direction of travel. The positive and negative poles of the road surface were connected to the output terminals via lead wires. The rutting test machine was started, and the test wheel was driven back and forth across the rutting plate using rubber tires with a tire pressure of 0.7 MPa. Three replicate tests were performed for each parameter, and the average value was used if no variation was observed. The output terminals were connected to an oscilloscope, and the maximum peak voltages were 81 V, 56 V, and 41 V, respectively, meeting the power requirements for engineering monitoring, temporary lighting, and security surveillance equipment in remote construction projects.

[0073] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A method for preparing an integrated road surface self-generating device, characterized in that: The following steps are involved: 1) The piezoelectric material and the matrix material are mixed and ultrasonically dispersed to obtain a mixed dry powder, water and admixtures are added to obtain a uniform composite, the uniform composite is vacuum cured and then crushed into particles, and then polarized to obtain the piezoelectric aggregate; 2) mixing construction waste soil, cement and piezoelectric aggregate and dry-mixing them, then adding water and admixtures to obtain piezoelectric dynamic cement soil filler (101); 3) After laying the lower insulating layer (102), bury the electric wire (106), pour the piezoelectric dynamic cement soil filler (101) and maintain it to the designed age, then lay the upper insulating layer (103) and the waterproof layer (104), and then connect the electric wire (106) to the piezoelectric energy recovery and storage device (105), so as to obtain an integrated road surface self-generating device; The raw materials in step 1) are calculated in parts by weight as follows: 50-65 parts of piezoelectric material, 10-20 parts of matrix material, 15-30 parts of water, and 7-11 parts of admixture; the piezoelectric aggregate is a 0-3 type piezoelectric composite material with a particle size of 5-25 mm; The admixture in step 1) comprises one or more of sodium aluminate, potassium aluminate and calcium aluminate; The piezoelectric material is in powder form and includes lead zirconate titanate piezoelectric ceramics, barium zirconate titanate piezoelectric ceramics or lead zirconate titanate piezoelectric ceramics modified with carbon nanotubes; the matrix material includes cement, fly ash or blast furnace slag; In step 2), the raw materials are calculated in parts by weight as follows: 30-50 parts of waste soil for construction, 5-20 parts of cement, 15-30 parts of water, 20-30 parts of piezoelectric aggregate, and 1-5 parts of admixture.

2. The method for preparing the integrated road surface self-generating device according to claim 1, characterized in that: In step 1), the ultrasonic frequency of ultrasonic dispersion is 19-30 kHz; the vacuum degree of vacuum curing is 20-75 kPa, and the curing time is 3-28 days; The polarization method is thermal polarization method, and the conditions are: polarization temperature is 70~120℃, polarization voltage is 2~5kV / mm, and polarization time is 20~50min.

3. The method for preparing the integrated road surface self-generating device according to claim 1, characterized in that: The admixture in step 2) includes one or more of a polycarboxylate water reducer, a calcium formate early strength agent, an air-entraining pumping agent, a calcium oxide expansion agent, and a polyether defoaming agent.

4. The method for preparing the integrated road surface self-generating device according to claim 3, characterized in that: In step 3), the upper insulating layer (103) and the lower insulating layer (102) are made of rubber, and both have a thickness of 5 to 20 mm; the waterproof layer (104) is an epoxy resin modified asphalt waterproof coating, and has a thickness of 1 to 5 mm.

5. The method for preparing the integrated road surface self-generating device according to claim 4, characterized in that: In step 3), the curing conditions are a temperature of 5-50°C and a relative humidity of 90%-97%; The design age is 3~28d; after curing to the design age, the strength of the piezoelectric cement soil filler (101) is 0.2~1.0MPa.

6. The method for preparing the integrated road surface self-generating device according to claim 5, characterized in that: In step 3), the piezoelectric energy recovery and storage devices (105) are distributed on both sides of the road along the road direction, and the interval between two adjacent piezoelectric energy recovery and storage devices (105) is 1000~2000m; the piezoelectric energy recovery and storage device (105) includes a primary energy storage element supercapacitor, a secondary energy storage element battery and a DC / DC voltage converter.

7. The integrated pavement self-generating device prepared by the method for preparing an integrated pavement self-generating device according to any one of claims 1 to 6 is characterized in that: The integrated pavement self-generating device comprises a piezoelectric dynamic cement soil filler (101), a lower insulating layer (102), an upper insulating layer (103), a waterproof layer (104), a piezoelectric energy recovery and storage device (105), and an electric wire (106).

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