CN103114515B - Piezoelectricity flush type damnification self-diagnosis asphalt concrete pavement structure - Google Patents
Piezoelectricity flush type damnification self-diagnosis asphalt concrete pavement structure Download PDFInfo
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Abstract
The present invention relates to Intelligent road engineering material, particularly relate to piezoelectricity flush type damnification self-diagnosis asphalt concrete pavement structure.Piezoelectricity flush type damnification self-diagnosis asphalt concrete pavement structure, it is characterized in that it comprises: the asphalt concrete pavement structure of being built by bituminous concrete, at least two the piezoelectricity self-diagnosis unit switches be layered in asphalt concrete pavement structure are buried when building, and the auxiliary diagnostic equipment be electrically connected with piezoelectricity self-diagnosis unit switches.This asphalt concrete pavement structure can pass through piezo-electric effect, utilizes the structural damage of the characteristic value change self diagnosis asphalt concrete pavement of stress wave propagation.
Description
Technical field
The present invention relates to Intelligent road engineering material, particularly relate to piezoelectricity flush type damnification self-diagnosis asphalt concrete pavement structure.
Background technology
It is good that asphalt concrete pavement has without seam, surface finish, and smooth ride, mechanization of building operation degree is high, progress is fast, quality is good, safeguard the advantages such as simple, and therefore, asphalt concrete pavement more and more comes into one's own, and is used widely.By the end of the end of the year 2011, highway in China mileage open to traffic will reach 410.02 ten thousand kilometers, and wherein speedway mileage reaches 8.49 ten thousand kilometers, occupies second place of the world.Due to the increasing rapidly of the traffic volume, increasing that load-carrying vehicle axle is heavy, cause asphalt concrete pavement to there is serious early damage, increase maintenance cost.Therefore, within the flexible pavement operating period, make road surface remain on best using state, reduce the focus that maintenance cost is highway administration and unit in charge of construction.
Piezo-electric effect is the phenomenon that in material, a kind of mechanical energy and electric energy exchange, and when some dielectric is subject to the effect of external force and is out of shape in a certain direction, its inside can produce polarization phenomena, occurs positive and negative contrary electric charge on its two apparent surfaces simultaneously.After external force is removed, it can return to uncharged state again, and this phenomenon is called direct piezoelectric effect.When the direction of active force changes, the polarity of electric charge also changes thereupon.On the contrary, when applying electric field on polarization of dielectric direction, these dielectrics also can deform, and after electric field removes, dielectric distortion disappears thereupon, and this phenomenon is called inverse piezoelectric effect,
Utilize piezo-electric effect, piezoelectric can use as driver and sensor, and the healthy self diagnosis that can realize road surface that it combined with asphalt concrete pavement is monitored.
Summary of the invention
The object of the present invention is to provide a kind of piezoelectricity flush type damnification self-diagnosis asphalt concrete pavement structure, this asphalt concrete pavement structure can pass through piezo-electric effect, utilizes the structural damage of the characteristic value change self diagnosis asphalt concrete pavement of stress wave propagation.
To achieve these goals, the technical solution adopted in the present invention is: piezoelectricity flush type damnification self-diagnosis asphalt concrete pavement structure, it is characterized in that it comprises: the asphalt concrete pavement structure of being built by bituminous concrete, at least two the piezoelectricity self-diagnosis unit switches be layered in asphalt concrete pavement structure are buried when building, and the auxiliary diagnostic equipment be electrically connected with piezoelectricity self-diagnosis unit switches.
Described bituminous concrete is composited by coarse aggregate, fine aggregate, pitch and breeze, and its pavement performance reaches bituminous mixture technical requirements.
Described coarse aggregate, fine aggregate all can adopt basalt, dolomite, granite, limestone or quartzite.Pitch can adopt heavily hands over petroleum bitumen or the modified bitumen as matrix; Breeze is limestone mineral powder.The particle diameter of coarse aggregate, for being greater than 4.75mm, is less than 35mm; The particle diameter of fine aggregate is for being less than or equal to 4.75mm.
Described piezoelectricity self-diagnosis unit switches is volume is 4 ~ 12cm
3cuboid; Adopt in each piezoelectricity self-diagnosis unit switches and stack formula structure, carry out connecting or parallel combination as electrode by conductive metal material using piezoceramic material, there is good piezoelectric property.
Described auxiliary diagnostic equipment as shown in Figure 3, is made up of signal excitation equipment (inverse piezoelectric effect 6) 1 and signal receiver (direct piezoelectric effect 8) 2; Signal excitation equipment (is produce pumping signal by signal projector and piezoelectric drive signal amplifier by signal projector and piezoelectric drive signal amplifier, piezoelectricity self-diagnosis unit switches is made to utilize piezo-electric effect to produce stress wave) composition, the output of signal projector is connected with the input of piezoelectric drive signal amplifier, and the output of piezoelectric drive signal amplifier is electrically connected with a piezoelectricity self-diagnosis unit switches 3; Signal receiver 2 is oscillograph, and signal receiver 2 is electrically connected with another piezoelectricity self-diagnosis unit switches 4 (utilizing the characteristic value of stress wave propagation to change the structural damage of self diagnosis asphalt concrete pavement).
Described asphalt concrete pavement structure 5 is divided into three, upper, middle and lower surface layer, wherein the thickness 2.5cm ~ 5cm of upper layer, the thickness 4cm ~ 7cm of middle surface layer, the thickness 5cm ~ 9cm of cutting optimal.Piezoelectricity self-diagnosis unit switches is buried in the middle of the different surface layer of paving, and mutual distance can not wait, and distance L0=1 ~ 50cm is partially formed array.
Above-mentioned piezoelectricity flush type damnification self-diagnosis asphalt concrete pavement structure is applied to high-grade highway, tunnel, deck paving or airport runways road surface, and city highway and People's Bank of China street.
Principle of the present invention is: utilize the change of the stress wave propagation characteristic value between piezoelectricity self-diagnosis unit switches to diagnose asphalt concrete pavement structure damage.At least plural piezoelectricity self-diagnosis unit switches of paving is buried in asphalt concrete pavement structure middle level, by the excitation of external signal excitation apparatus (signal generator), a piezoelectricity self-diagnosis unit switches is made to produce stress wave, this stress wave is propagated among bituminous concrete, when this wave loops is to another piezoelectricity self-diagnosis unit switches, because the structural damage of bituminous concrete inside and the impact in space 7 cause the energy of stress wave to have certain loss, observed the change of voltage output by oscillograph.Therefore by setting up relation between the characteristic value of stress wave propagation and asphalt concrete structure damage type, bituminous concrete is made to possess the function of self diagnosis.
The invention provides a kind of pattern completely newly utilizing piezo-electric effect to diagnose asphalt concrete pavement damage, it relates to the sustainable development of China's communication, the problem of Novel lossless detection development and utilization.Therefore, there is following major advantage:
1. the invention provides a kind of piezoelectricity flush type damnification self-diagnosis asphalt concrete pavement structure of novel simple, quick, clean, environmental protection nondestructive testing, without the need to heavy checkout equipment, support for asphalt concrete pavement pipe and decision data quantitative is efficiently provided.The method prepares asphalt concrete pavement structure by piezo-electric effect, can utilize the structural damage of the characteristic value change self diagnosis asphalt concrete pavement of stress wave propagation.
2. piezoelectricity self-diagnosis unit switches provided by the invention, has rational size and intensity, does not affect and meet the use of asphalt concrete pavement to asphalt concrete structure performance, identical with common mineral aggregate effect.
3. the functional module of bituminous concrete is intelligent, not only uses as ground surface material, but uses as a kind of novel intelligent concrete.
4. the asphalt concrete pavement being embedded with piezoelectricity self-diagnosis unit switches has good pavement performance and anti-fatigue performance, meets bituminous mixture technical requirements, extensively can promote and progressively replace asphalt concrete road surface.
Accompanying drawing explanation
Fig. 1 is piezo-electric effect principle schematic; (a) direct piezoelectric effect, (b) inverse piezoelectric effect.
Fig. 2 is the pictorial diagram that the present invention stacks the piezoelectricity self-diagnosis unit switches of type.
Fig. 3 is the schematic diagram of piezoelectricity flush type damnification self-diagnosis asphalt concrete pavement structure of the present invention.
Fig. 4 is the pictorial diagram of the embodiment of the present invention 3.
Fig. 5 is the signal graph of the present invention to asphalt concrete pavement damage check.
Number in the figure: 1-signal excitation equipment, 2-signal receiver, 3-piezoelectricity self-diagnosis unit switches, another piezoelectricity self-diagnosis unit switches of 4-, 5-asphalt concrete pavement structure, 6-inverse piezoelectric effect, 7-damage and space, 8-direct piezoelectric effect.
Detailed description of the invention
In order to understand the present invention better, illustrate content of the present invention further below in conjunction with embodiment, but content of the present invention is not only confined to the following examples.
In following embodiment 1-5:
As shown in Figure 3, piezoelectricity flush type damnification self-diagnosis asphalt concrete pavement structure, it comprises: the asphalt concrete pavement structure 5 of being built by bituminous concrete, at least two the piezoelectricity self-diagnosis unit switches (a piezoelectricity self-diagnosis unit switches 3 and another piezoelectricity self-diagnosis unit switches 4) be layered in asphalt concrete pavement structure are buried when building, and the auxiliary diagnostic equipment be electrically connected with piezoelectricity self-diagnosis unit switches.
According to " highway asphalt construction technique normalizing " (JTGF40-2004) relevant regulations, select satisfactory coarse aggregate, fine aggregate, pitch and breeze.By the structure such as existing grating AC, SMA, Superpave and the theoretical fully combination of gradation design, optimize and improve original grating, find out optimum gradation, make it form and meet the bituminous concrete that can bury paving piezoelectricity self-diagnosis unit switches and require, and pavement performance reaches bituminous mixture technical requirements.
Described bituminous concrete is composited by coarse aggregate, fine aggregate, pitch and breeze, and its pavement performance reaches bituminous mixture technical requirements.
In each match ratio, the requirement of sieve aperture is as shown in the table.
Described coarse aggregate, fine aggregate all can adopt basalt, dolomite, granite, limestone or quartzite.Pitch can adopt heavily hands over petroleum bitumen or the modified bitumen as matrix; Breeze is limestone mineral powder.The particle diameter of coarse aggregate, for being greater than 4.75mm, is less than 35mm; The particle diameter of fine aggregate is for being less than or equal to 4.75mm.
Road structure layer thickness is one of factor affecting pavement durability, and its thickness and raw material parameter have substantial connection, selects raw material according to above-mentioned, by analog computation asphalt concrete pavement structure layer thickness.Described asphalt concrete pavement structure is divided into three, upper, middle and lower surface layer, wherein the thickness 2.5cm ~ 5cm of upper layer, the thickness 4cm ~ 7cm of middle surface layer, the thickness 5cm ~ 9cm of cutting optimal.Piezoelectricity self-diagnosis unit switches is buried in the middle of the different surface layer of paving, and mutual distance can not wait, and distance L=0 ~ 50cm is partially formed array.
Above-mentioned piezoelectricity self-diagnosis unit switches is the cuboid with a fixed length L, wide W, thick T, and its inside comprises some piezoelectric elements.According to " bituminous pavement design for highway specification " (JTGD50-2006), the two-wheel contact area of every side, be scaled an equivalent circle, be then referred to as single circle load; Two, every side corresponding contact area of tire, be scaled two equivalent circles respectively, be then referred to as two circle load.Two round load diameter of equivalent circle d and single circle load equivalent diameter D:
Can according to long L, wide W, the thick T of the factor design piezoelectricity self-diagnosis unit switches such as different vehicle flowrates, type of vehicle, diameter of equivalent circle d or D; In formula, P represents tire pressure.
Above-mentioned piezoelectricity self-diagnosis unit switches, after design parameter is determined, first can be preset in during construction and bury bunk and put, the synchronous roller-compaction when asphalt concrete pavement construction.
When above-mentioned some piezoelectricity self-diagnosis unit switches bury paving, can at runway, fast, curb optional position is laid, and the distance of horizontal direction two piezoelectricity self-diagnosis unit switches is L0(1-50cm), vertical direction piezoelectricity self-diagnosis unit switches is buried on the surface layer that is layered on and constructed.
Described piezoelectricity self-diagnosis unit switches is volume is 4 ~ 12cm
3cuboid; Adopt in each piezoelectricity self-diagnosis unit switches and stack formula structure, carry out connecting or parallel combination as electrode by conductive metal material using piezoceramic material, there is good piezoelectric property.
Described auxiliary diagnostic equipment as shown in Figure 3, is made up of signal excitation equipment (inverse piezoelectric effect 6) 1 and signal receiver (direct piezoelectric effect 8) 2; Signal excitation equipment (is produce pumping signal by signal projector and piezoelectric drive signal amplifier by signal projector and piezoelectric drive signal amplifier, piezoelectricity self-diagnosis unit switches is made to utilize piezo-electric effect to produce stress wave) composition, the output of signal projector is connected with the input of piezoelectric drive signal amplifier, and the output of piezoelectric drive signal amplifier is electrically connected with a piezoelectricity self-diagnosis unit switches 3; Signal receiver 2 is oscillograph, and signal receiver 2 is electrically connected with another piezoelectricity self-diagnosis unit switches 4 (utilizing the characteristic value of stress wave propagation to change the structural damage of self diagnosis asphalt concrete pavement).
In sum, according to " bituminous pavement design for highway specification " (JTGD50-2006), adopt following raw material to prepare and bury the bituminous concrete being covered with damnification self-diagnosis unit:
A. gather materials (coarse aggregate, fine aggregate): the basalt that Zhenjiang, Jiangsu Mao Di produces, and maximum particle diameter is 13.2mm, is divided into 13.2mm ~ 9.5mm; 9.5mm ~ 4.75mm (not containing 4.75mm); 4.75mm ~ 2.36mm; Be less than 2.36mm fourth gear.
B. pitch: Hubei state wound heavy traffic paving asphalt AH-70;
C. breeze: Ezhou four reaches the limestone mineral powder that building materials company produces, hydrophilic coefficient 0.92, main chemical compositions CaO (53.5%, SiO
2(1.56%);
D. match ratio: coarse aggregate 56%, fine aggregate 40%, breeze 4% (the mass percent sum of coarse aggregate, fine aggregate and breeze is 100%), bitumen aggregate ratio is the addition of 4.8%(pitch is 4.8% of coarse aggregate, fine aggregate and powdered ore quality);
E. piezoceramic material: the piezoelectric ceramics that Shandong Zibo Yu Hai electronic ceramics Co., Ltd produces; Conductive metal material is copper sheet.Piezoceramic material also can adopt high performance, can better effects if.
By Analysis of Pavement Structural Stress, tyre contact area analysis, finite element modelling and specifically testing, apply above-mentioned bituminous concrete Asphalt Concrete Pavement Design structure:
A. asphalt concrete pavement structure layer thickness is: upper layer 4cm, middle surface layer 6cm, cutting optimal 8cm;
B. the long L=2cm of the size of piezoelectricity self-diagnosis unit switches, wide W=2cm, thick T=3cm;
C. piezoelectricity self-diagnosis unit switches is buried and is layered on bottom bituminous concrete upper layer, good by test piezo-electric effect.
Utilize the selection of the mineral aggregate of piezo-electric effect self diagnosis asphalt concrete pavement, breeze, pitch; the design of match ratio; the design of road surface structare layer; and piezoelectricity self-diagnosis unit switches size, bury that bunk is put, buried paving mode, connected mode is not limited to above-mentioned situation; according to the technology of the present invention principle, modifying to above-mentioned achievement and be out of shape all belongs to protection scope of the present invention.
A kind of asphalt concrete pavement utilizing piezo-electric effect damnification self-diagnosis provided by the invention, realizes the nondestructive testing utilizing piezo-electric effect to damage flexible pavement by following steps:
A. various Load materials is investigated, and sampling test, select the material needed for each deck in road surface according to result of the test; Determine the match ratio of compound, and test, determine material design parameters;
B. road surface structare layer is drafted, analog computation thickness;
C. according to step a, the long L of piezoelectricity self-diagnosis unit switches, wide W, thick T is determined, and some unit mutual distance L0;
D. piezo-electric effect is utilized piezoelectric to be made signal generator (inverse piezoelectric effect) or signal receiver (direct piezoelectric effect), both being buried spreads into asphalt concrete pavement, and the interaction between both utilizations and asphalt concrete pavement realizes the damnification self-diagnosis to asphalt concrete pavement
Introduce several embodiment about utilizing piezo-electric effect damnification self-diagnosis asphalt concrete pavement below.
Embodiment 1:
The mass ratio of asphalt concrete (i.e. bituminous concrete) in embodiment 1: coarse aggregate 56%, fine aggregate 40%, the percetage by weight sum of breeze 4%(coarse aggregate, fine aggregate and breeze is 100%, and following examples are identical); Bitumen aggregate ratio is the addition of 4.8%(and pitch is 4.8% of coarse aggregate, fine aggregate and powdered ore quality), imbed the piezoelectricity self-diagnosis unit switches of long L=2cm, wide W=2cm, thick T=3cm.Other sees above-mentioned.Embodiment 1, according to the shaping marshal piece of compacting process of T0702-2011 in " highway engineering pitch and Asphalt Mixture Experiment code " (JTGE20-2011), imbeds piezoelectricity self-diagnosis unit switches time shaping.Its piezoelectric property index is as shown in table 1, and as seen from table, piezoelectricity damnification self-diagnosis bituminous concrete prepared by the present invention has excellent piezoelectric property.
Embodiment 2 and embodiment 3:
The mass ratio of asphalt concrete (i.e. bituminous concrete) in embodiment 2: coarse aggregate 56%, fine aggregate 40%, breeze 4%; Bitumen aggregate ratio is the addition of 4.8%(and pitch is 4.8% of coarse aggregate, fine aggregate and powdered ore quality), do not imbed piezoelectricity self-diagnosis unit switches, as a comparison embodiment.
The mass ratio of asphalt concrete (i.e. bituminous concrete) in embodiment 3: coarse aggregate 56%, fine aggregate 40%, breeze 4%; Bitumen aggregate ratio is the addition of 4.8%(and pitch is 4.8% of coarse aggregate, fine aggregate and powdered ore quality), but wherein imbed the piezoelectricity self-diagnosis unit switches of long L=2cm, wide W=2cm, thick T=3cm.Embodiment 2,3 all according to the wheel milling process forming cart rut plate test specimen of T0703-2011 in " highway engineering pitch and Asphalt Mixture Experiment code " (JTGE20-2011), imbeds piezoelectricity self-diagnosis unit switches when embodiment 3 is shaping.Rut plate sample dimensions is long 300mm × wide 300mm × high 50mm, and piezoelectricity self-diagnosis unit switches is buried and is laid on bottom test specimen.Its pavement performance index is as shown in table 2, and as seen from table, after embodiment 3 imbeds piezoelectricity self-diagnosis unit switches, its pavement performance is compared with embodiment 2, and dynamic stability drops to 1493 times/mm from 1580 times/mm; Marshall stability drops to 10.3kN from 11.5kN; In infiltration test, do not seep water or seldom seep water.
Piezoelectricity damnification self-diagnosis bituminous concrete prepared by embodiment 3 has excellent piezoelectric property (with embodiment 1).
Embodiment 4:
The mass ratio of asphalt concrete (i.e. bituminous concrete) in embodiment 4: coarse aggregate 56%, fine aggregate 40%, breeze 4%; Bitumen aggregate ratio is the addition of 4.8%(and pitch is 4.8% of coarse aggregate, fine aggregate and powdered ore quality).All according to the wheel milling process forming cart rut plate test specimen of T0703-2011 in " highway engineering pitch and Asphalt Mixture Experiment code ", time shaping, imbed piezoelectricity self-diagnosis unit switches.Rut plate sample dimensions is long 300mm × wide 300mm × high 150mm, and piezoelectricity self-diagnosis unit switches is buried and is laid on bottom test specimen.Carry out artificial cutting on bituminous concrete surface, the degree of depth is about 3mm, and connect auxiliary diagnosis equipment and carry out self diagnosis detection to bituminous concrete damage, result as shown in Figure 5.Signal generator applies 20V, the bituminous concrete of the signal that 50kHz produces by there being gap to exist, the voltage magnitude that receiver is produced and the amplitude of asphalt concrete have remarkable difference, thus achieve the damnification self-diagnosis to asphalt concrete pavement.This asphalt concrete pavement structure can pass through piezo-electric effect, utilizes the structural damage of the characteristic value change self diagnosis asphalt concrete pavement of stress wave propagation.
Embodiment 5:
The mass ratio of asphalt concrete in embodiment 5: coarse aggregate 56%, fine aggregate 40%, breeze 4%; Bitumen aggregate ratio is the addition of 4.8%(and pitch is 4.8% of coarse aggregate, fine aggregate and powdered ore quality).All according to the wheel milling process forming cart rut plate test specimen of T0703-2011 in " highway engineering pitch and Asphalt Mixture Experiment code ", time shaping, imbed piezoelectricity self-diagnosis unit switches.Rut plate sample dimensions is long 300mm × wide 300mm × high 150mm, and piezoelectricity self-diagnosis unit switches is buried and is laid on bottom test specimen.The rut plate test specimen of 2 formings is carried out the actual pavement spread of bonding simulation by mulseal.Connect auxiliary diagnosis equipment and carry out damnification self-diagnosis detection to the bonding situation between upper and lower 2 layers of bituminous concrete, result as shown in Figure 5.Signal generator applies 20V, the signal that 50kHz produces is by the bituminous concrete of two-layer connection, the voltage magnitude that receiver is produced and the amplitude of asphalt concrete have remarkable difference, thus achieve the damnification self-diagnosis to asphalt concrete pavement.
The piezoelectric property of table 1 piezoelectricity self-diagnosis unit switches
| Project | Dielectric loss Tan ξ [%] | Piezoelectric constant d 33[pc/N] | Electromechanical coupling factor K 33 | Mechanical quality factor Q m |
| Index | 0.12 | 276 | 0.6 | 745 |
The pavement performance of table 2 piezoelectricity damnification self-diagnosis bituminous concrete
Embodiment 6:
Substantially the same manner as Example 3, difference is: basalt is replaced by " dolomite ", and piezoelectric property, pavement performance are with table 1, table 2.To the damnification self-diagnosis of asphalt concrete pavement with embodiment 4.
Embodiment 7:
Substantially the same manner as Example 3, difference is: basalt is replaced by " granite ", and piezoelectric property, pavement performance are with table 1, table 2.To the damnification self-diagnosis of asphalt concrete pavement with embodiment 4.
Embodiment 8:
Substantially the same manner as Example 3, difference is: basalt is replaced by " limestone ", and piezoelectric property, pavement performance are with table 1, table 2.To the damnification self-diagnosis of asphalt concrete pavement with embodiment 4.
Embodiment 9:
Substantially the same manner as Example 3, difference is: basalt is replaced by " quartzite ", and piezoelectric property, pavement performance are with table 1, table 2.To the damnification self-diagnosis of asphalt concrete pavement with embodiment 4.
Embodiment 10:
Piezoelectricity flush type damnification self-diagnosis asphalt concrete pavement structure, it comprises: the asphalt concrete pavement structure of being built by bituminous concrete, at least two the piezoelectricity self-diagnosis unit switches be layered in asphalt concrete pavement structure are buried when building, and the auxiliary diagnostic equipment be electrically connected with piezoelectricity self-diagnosis unit switches.
Described bituminous concrete is composited by coarse aggregate, fine aggregate, pitch and breeze, the mass ratio of bituminous concrete: coarse aggregate 56%, fine aggregate 40%, breeze 4%; Bitumen aggregate ratio is the addition of 4.8%(and pitch is 4.8% of coarse aggregate, fine aggregate and powdered ore quality), its pavement performance reaches bituminous mixture technical requirements.
Described coarse aggregate, fine aggregate all can adopt basalt.Pitch can adopt and heavily hand over petroleum bitumen; Breeze is limestone mineral powder.The particle diameter of coarse aggregate, for being greater than 4.75mm, is less than 35mm; The particle diameter of fine aggregate is for being less than or equal to 4.75mm.
Described piezoelectricity self-diagnosis unit switches is volume is 4cm
3cuboid; Adopt in each piezoelectricity self-diagnosis unit switches and stack formula structure, carry out tandem compound by conductive metal material as electrode using piezoceramic material, there is good piezoelectric property.Piezoceramic material: the piezoelectric ceramics that Shandong Zibo Yu Hai electronic ceramics Co., Ltd produces; Conductive metal material is copper sheet.
Described auxiliary diagnostic equipment as shown in Figure 3, is made up of signal excitation equipment (inverse piezoelectric effect 6) 1 and signal receiver (direct piezoelectric effect 8) 2; Signal excitation equipment (is produce pumping signal by signal projector and piezoelectric drive signal amplifier by signal projector and piezoelectric drive signal amplifier, piezoelectricity self-diagnosis unit switches is made to utilize piezo-electric effect to produce stress wave) composition, the output of signal projector is connected with the input of piezoelectric drive signal amplifier, and the output of piezoelectric drive signal amplifier is electrically connected with a piezoelectricity self-diagnosis unit switches 3; Signal receiver 2 is oscillograph, and signal receiver 2 is electrically connected with another piezoelectricity self-diagnosis unit switches 4 (utilizing the characteristic value of stress wave propagation to change the structural damage of self diagnosis asphalt concrete pavement).
Described asphalt concrete pavement structure 5 is divided into three, upper, middle and lower surface layer, wherein the thickness 2.5cm of upper layer, the thickness 4cm of middle surface layer, the thickness 5cm of cutting optimal.Piezoelectricity self-diagnosis unit switches is buried in the middle of the different surface layer of paving, and mutual distance can not wait, and distance L=1cm is partially formed array.
Its piezoelectric property, pavement performance are with table 1, table 2.To the damnification self-diagnosis of asphalt concrete pavement with embodiment 4.
Embodiment 11:
Piezoelectricity flush type damnification self-diagnosis asphalt concrete pavement structure, it comprises: the asphalt concrete pavement structure of being built by bituminous concrete, at least two the piezoelectricity self-diagnosis unit switches be layered in asphalt concrete pavement structure are buried when building, and the auxiliary diagnostic equipment be electrically connected with piezoelectricity self-diagnosis unit switches.
Described bituminous concrete is composited by coarse aggregate, fine aggregate, pitch and breeze, the mass ratio of bituminous concrete: coarse aggregate 56%, fine aggregate 40%, breeze 4%; Bitumen aggregate ratio is the addition of 4.8%(and pitch is 4.8% of coarse aggregate, fine aggregate and powdered ore quality).Its pavement performance reaches bituminous mixture technical requirements.
Described coarse aggregate, fine aggregate all can adopt basalt.Pitch can adopt and heavily hand over petroleum bitumen; Breeze is limestone mineral powder.The particle diameter of coarse aggregate, for being greater than 4.75mm, is less than 35mm; The particle diameter of fine aggregate is for being less than or equal to 4.75mm.
Described piezoelectricity self-diagnosis unit switches is volume is 12cm
3cuboid; Adopt in each piezoelectricity self-diagnosis unit switches and stack formula structure, carry out parallel combination by conductive metal material as electrode using piezoceramic material, there is good piezoelectric property.Piezoceramic material: the piezoelectric ceramics that Shandong Zibo Yu Hai electronic ceramics Co., Ltd produces; Conductive metal material is copper sheet.
Described auxiliary diagnostic equipment as shown in Figure 3, is made up of signal excitation equipment (inverse piezoelectric effect 6) 1 and signal receiver (direct piezoelectric effect 8) 2; Signal excitation equipment (is produce pumping signal by signal projector and piezoelectric drive signal amplifier by signal projector and piezoelectric drive signal amplifier, piezoelectricity self-diagnosis unit switches is made to utilize piezo-electric effect to produce stress wave) composition, the output of signal projector is connected with the input of piezoelectric drive signal amplifier, and the output of piezoelectric drive signal amplifier is electrically connected with a piezoelectricity self-diagnosis unit switches 3; Signal receiver 2 is oscillograph, and signal receiver 2 is electrically connected with another piezoelectricity self-diagnosis unit switches 4 (utilizing the characteristic value of stress wave propagation to change the structural damage of self diagnosis asphalt concrete pavement).
Described asphalt concrete pavement structure 5 is divided into three, upper, middle and lower surface layer, wherein the thickness 5cm of upper layer, the thickness 7cm of middle surface layer, the thickness 9cm of cutting optimal.Piezoelectricity self-diagnosis unit switches is buried in the middle of the different surface layer of paving, and distance L=50cm is partially formed array.
Its piezoelectric property, pavement performance are with table 1, table 2.To the damnification self-diagnosis of asphalt concrete pavement with embodiment 4.
Claims (6)
1. piezoelectricity flush type damnification self-diagnosis asphalt concrete pavement structure, it is characterized in that it comprises: the asphalt concrete pavement structure of being built by bituminous concrete, at least two the piezoelectricity self-diagnosis unit switches be layered in asphalt concrete pavement structure are buried when building, and the auxiliary diagnostic equipment be electrically connected with piezoelectricity self-diagnosis unit switches;
Described piezoelectricity self-diagnosis unit switches is volume is 4 ~ 12cm
3cuboid; Adopt in each piezoelectricity self-diagnosis unit switches and stack formula structure, carry out connecting or parallel combination as electrode by conductive metal material using piezoceramic material;
Described auxiliary diagnostic equipment is made up of signal excitation equipment (1) and signal receiver (2); Signal excitation equipment is made up of signal projector and piezoelectric drive signal amplifier, and the output of signal projector is connected with the input of piezoelectric drive signal amplifier, and the output of piezoelectric drive signal amplifier is electrically connected with a piezoelectricity self-diagnosis unit switches (3); Signal receiver (2) is oscillograph, and signal receiver (2) is electrically connected with another piezoelectricity self-diagnosis unit switches (4);
Described asphalt concrete pavement structure is divided into three, upper, middle and lower surface layer, wherein the thickness 2.5cm ~ 5cm of upper layer, the thickness 4cm ~ 7cm of middle surface layer, the thickness 5cm ~ 9cm of cutting optimal; Piezoelectricity self-diagnosis unit switches is buried in the middle of the different surface layer of paving, and distance L0=1 ~ 50cm is partially formed array.
2. piezoelectricity flush type damnification self-diagnosis asphalt concrete pavement structure according to claim 1, it is characterized in that: described bituminous concrete is composited by coarse aggregate, fine aggregate, pitch and breeze, its pavement performance reaches bituminous mixture technical requirements.
3. piezoelectricity flush type damnification self-diagnosis asphalt concrete pavement structure according to claim 2, is characterized in that: described coarse aggregate, fine aggregate all can adopt basalt, dolomite, granite, limestone or quartzite.
4. piezoelectricity flush type damnification self-diagnosis asphalt concrete pavement structure according to claim 2, is characterized in that: pitch can adopt heavily hands over petroleum bitumen or the modified bitumen as matrix; Breeze is limestone mineral powder.
5. the piezoelectricity flush type damnification self-diagnosis asphalt concrete pavement structure according to Claims 2 or 3, is characterized in that: the particle diameter of coarse aggregate, for being greater than 4.75mm, is less than 35mm; The particle diameter of fine aggregate is for being less than or equal to 4.75mm.
6. piezoelectricity flush type damnification self-diagnosis asphalt concrete pavement structure according to claim 2, it is characterized in that, the mass percent of coarse aggregate, fine aggregate and breeze is: coarse aggregate 56%, fine aggregate 40%, breeze 4%; Bitumen aggregate ratio is 4.8%.
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| CN103669151B (en) * | 2013-12-09 | 2015-08-19 | 长安大学 | A kind of power generation pavement structure based on piezoelectric asphalt concrete |
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| CN107628774A (en) * | 2017-09-25 | 2018-01-26 | 长安大学 | A kind of piezoelectric type asphaltmastic road surface electricity generation material and preparation method thereof |
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