CN102830021A - Interlaminar shear device of cylindrical test piece of bituminous paving and shearing method thereof - Google Patents
Interlaminar shear device of cylindrical test piece of bituminous paving and shearing method thereof Download PDFInfo
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- CN102830021A CN102830021A CN2012103029799A CN201210302979A CN102830021A CN 102830021 A CN102830021 A CN 102830021A CN 2012103029799 A CN2012103029799 A CN 2012103029799A CN 201210302979 A CN201210302979 A CN 201210302979A CN 102830021 A CN102830021 A CN 102830021A
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Abstract
The invention discloses an interlaminar shear device of a cylindrical test piece of a bituminous paving and a shearing method thereof. The device comprises shearing assembly, a press machine and a cylindrical test piece, and further comprises a pre-compressed member for locking the cylindrical test piece. The shearing assembly comprises a shearing pressure head and a shearing pedestal, wherein the shearing pedestal is mounted on a loading pedestal and provided with an empty groove in the center thereof, the empty groove is symmetrically provided with contact parts at two sides thereof, and the contact parts are respectively contacted with a first structural layer and a third structural layer. The shearing method provided by the invention can symmetrically apply shear stress, eliminate countertorque to instruments caused by eccentric loading, and therefore prevent damage to loading devices of the instruments.
Description
Technical field
The present invention relates to highway engineering asphalt pavement material and structural research technical field, relate in particular to a kind of bituminous pavement right cylinder test specimen interlayer shear device and cutting method thereof.
Background technology
Spill the asphalt material thin layer of cloth for the bonding between each structural sheet of strengthening bituminous pavement, be called tack coat.Tack coat makes each structural sheet of road surface become integral body, bears the effect of traffic loading jointly.The performance road pavement structure usability influence of tack coat significantly.Bonding is not firm between the road surface structare layer, and under the driving load action, the road surface is prone to passing, gathers around multiple diseases such as bag and cracking.In general, can estimate the performance of tack coat through indoor shear test.2008; The Liu Li of Chang An University has proposed a kind of bituminous pavement interlayer shearing test method in PhD dissertation " bituminous pavement interlayer punishment technical research ": earlier through rolling moulding 2 laminates bulk and the middle right cylinder test specimen that sandwiches tack coat; Bore core then and obtain the right cylinder test specimen, the right cylinder test specimen is used for shear test.
The problem that this test unit and test method exist is: (1) when the right cylinder test specimen was carried out shear test, the eccentric loading of charger produced counter torque, fragile instrument to instrument; (2) bear compressive stress and shear stress effect on the shear surface between the actual road surface structare layer simultaneously, and the shearing test method in the Liu Li PhD dissertation can't apply compressive stress on shear surface.
Summary of the invention
Goal of the invention of the present invention is to the technical deficiency of existing highway engineering bituminous pavement shear and cutting method, and a kind of bituminous pavement right cylinder test specimen interlayer shear device is provided.
Further, a kind of bituminous pavement right cylinder test specimen interlayer shear method is provided.
For realizing the foregoing invention purpose, the technical scheme that the present invention adopts is:
A kind of bituminous pavement right cylinder test specimen interlayer shear device is provided, comprises shearing component and pressing machine;
Also comprise pre-press, pressing machine comprises loaded seat, and pre-press places on the loaded seat, and pre-press is built-in with the right cylinder test specimen; Pre-press is through pressing machine locking right cylinder test specimen;
The right cylinder test specimen comprises first structural sheet, second structural sheet, the 3rd structural sheet, is connected through first tack coat between first structural sheet and second structural sheet, is connected through second tack coat between second structural sheet and the 3rd structural sheet;
Shearing component comprises to be sheared pressure head and shears base; Shear base and be loaded on the loaded seat, and shear center and be provided with dead slot, the relative symmetria bilateralis of dead slot is provided with contact site, and contact site contacts with first structural sheet, the 3rd structural sheet respectively;
Shear pressure head and be installed on the right cylinder test specimen of traverse, and the center line of shearing pressure head, second structural sheet, shearing base and dead slot is on same straight line; Shear the thickness of the surface of contact length of pressure head and right cylinder test specimen less than second structural sheet; The length of dead slot is greater than the thickness sum of second structural sheet, first tack coat and second tack coat, and less than the thickness sum of first structural sheet, second structural sheet, the 3rd structural sheet, first tack coat and second tack coat.
Preferably, said shearing pressure head contacts with the right cylinder test specimen, and the diameter of surface of contact is consistent with the diameter dimension of right cylinder test specimen.
Preferably, said pre-press also comprises base plate, top board and guide rod; Said base plate places the bottom of right cylinder test specimen, and said top board places the top of right cylinder test specimen; Said guide rod one end is installed on the top board through clamping screw, and the other end places on the base plate; Said pressing machine lock onto the right cylinder test specimen in the pre-press through clamping screw.
Preferably, the quantity of said guide rod is 4, and 4 follow guide rod to be in turn connected into square.
One of preferred version, said right cylinder test specimen adopt indoor gyratory compaction method layering to make the right cylinder test specimen.At first selecting internal diameter is that 10cm, length are the die trial of 30cm; In the die trial bottom, make first structural sheet according to the thickness and the material requirements of first structural sheet; When treating that first structural sheet is reduced to room temperature, smear sticking material, form first tack coat at the first structural sheet upper surface; Then, on first tack coat, continue to fill the asphalt of second structural sheet, make second structural sheet; When treating that the second structural sheet temperature is reduced to room temperature, smear sticking material, form second tack coat at the second structural sheet upper surface; At last, on second tack coat, continue to fill the asphalt of the 3rd structural sheet, make the 3rd structural sheet, when treating that right cylinder test specimen temperature is reduced to room temperature, promptly can be used for shear test of the present invention according to the thickness of the 3rd structural sheet.
Two of preferred version, said right cylinder test specimen is for adopting the on-the-spot road surface core of getting core.When bituminous pavement is made up of upper layer, tack coat, middle surface layer, tack coat, following surface layer; And the thickness of each structural sheet is in the thickness range of the present invention's first structural sheet, second structural sheet and the 3rd structural sheet the time; Use corning machine to drill through the core of diameter, be used for shear test of the present invention as the continuous whole of bituminous pavement upper layer, tack coat, middle surface layer, tack coat and the following surface layer of 10cm.
Preferably, the constituent material of first structural sheet, second structural sheet and the 3rd structural sheet is asphalt; First tack coat and second tack coat all adopt asphalt material.
Preferably, said right cylinder test specimen diameter is 9cm～11cm; Wherein, the thickness of first structural sheet is 4cm～10cm; The thickness of second structural sheet is 4cm～6cm; The thickness of the 3rd structural sheet is 4cm～10cm; The thickness of first tack coat and second tack coat is 0mm～2mm.
Further, the present invention provides a kind of bituminous pavement right cylinder test specimen interlayer shear method, may further comprise the steps:
1) pre-press is installed: pre-press comprises base plate, top board, guide rod and clamping screw; Base plate places the bottom of right cylinder test specimen, and top board places the top of right cylinder test specimen, and said guide rod one end is installed on the top board through clamping screw, and the other end places on the base plate;
2) precompressed, locking right cylinder test specimen: the pre-press that the right cylinder test specimen will be housed is placed on the loaded seat of pressing machine vertically, exerts pressure for the right cylinder test specimen through top board; Then, tighten clamping screw gradually, return zero, thereby guarantee that pressing machine lock onto the right cylinder test specimen in the pre-press through clamping screw until the pressure gauge reading of pressing machine;
3) install to shear: will shear on the loaded seat that base is installed in pressing machine; With step 2) in the right cylinder test specimen of locking be disposed across and shear on the base; Shearing component comprises to be sheared pressure head and shears base; Shear base and be loaded on the loaded seat, and shear center and be provided with dead slot, the relative symmetria bilateralis of dead slot is provided with contact site, and contact site contacts with first structural sheet, the 3rd structural sheet respectively; With the right cylinder test specimen traverse after the locking and be loaded on and shear on the base, shear pressure head and be installed on the right cylinder test specimen, and shear pressure head, second structural sheet, the center line of shearing base and dead slot is on same straight line; Shear the thickness of the surface of contact length of pressure head and right cylinder test specimen less than second structural sheet, the length of dead slot is greater than the thickness sum of second structural sheet, first tack coat and second tack coat; Through shearing pressure head the right cylinder test specimen is loaded, thereby carry out shear test.
Preferably, step 2) in, be to reduce the deformation of creep and the stress relaxation that produces after the precompressed of right cylinder test specimen, said right cylinder test specimen is from locking onto time of beginning to shear in 5min.
The present invention has following beneficial effect with respect to prior art:
(1) bituminous pavement right cylinder test specimen interlayer shear device of the present invention and cutting method thereof, symmetry applies shear stress on the right cylinder test specimen, has eliminated the counter torque of eccentric loading to instrument, thereby has avoided the damage to the instrument charger;
(2) bituminous pavement right cylinder test specimen interlayer shear device of the present invention and cutting method thereof, first precompressed is sheared again, can on shear surface, apply compressive stress and shear stress simultaneously, meets the stress on actual road surface more.
Description of drawings
Fig. 1 is the test specimen of the right cylinder test specimen of bituminous pavement right cylinder test specimen interlayer shear device of the present invention and the front view after the pre-press installation;
Fig. 2 is the test specimen of the right cylinder test specimen of bituminous pavement right cylinder test specimen interlayer shear device of the present invention and the vertical view after the pre-press installation;
Fig. 3 is the main cut-open view after right cylinder test specimen of the present invention, pre-press and shearing component are installed;
Fig. 4 is the right view after right cylinder test specimen of the present invention, pre-press and shearing component are installed.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment goal of the invention of the present invention is done to describe in further detail, embodiment can not give unnecessary details at this one by one, but therefore embodiment of the present invention is not defined in following examples.Unless stated otherwise, the material and the job operation of the present invention's employing are present technique field conventional material and job operation.
In the present embodiment, adopt indoor gyratory compaction method layering to make the right cylinder test specimen.
According to " T0736-2011 asphalt gyratory compaction right cylinder test specimen method for making (SGC method) " in " highway engineering pitch and asphalt testing regulations " (JTG E20-2011), right cylinder test specimen required for the present invention is made in layering.The selection internal diameter is 10cm, and length is the die trial of 30cm; In the die trial bottom, making thickness through gyratory compaction AC-25C type asphalt is first structural sheet 51 of 10cm; When treating that first structural sheet, 51 temperature are reduced to room temperature, at first structural sheet, 51 surface modification emulsified asphalts, smearing thickness is 0.3mm, treat the emulsified asphalt breakdown of emulsion after, form first tack coat 54; Then, on first tack coat 54, continue to fill AC-20C type asphalt, making thickness through gyratory compaction is second structural sheet 52 of 6cm; When treating that right cylinder test specimen temperature is reduced to room temperature, smear modified emulsifying asphalt on right cylinder test specimen surface, smearing thickness is 0.3mm, treat the emulsified asphalt breakdown of emulsion after, form second tack coat 55; At last, on second tack coat 55, continue to fill AC-13C type asphalt, making thickness through gyratory compaction is the 3rd structural sheet 53 of 4cm, when treating that right cylinder test specimen 5 temperature are reduced to room temperature, promptly can be used for shear test of the present invention.
These right cylinder test specimen 5 diameters are 10cm.Wherein, first structural sheet 51 adopts AC-25C type asphalt, and thickness is 10cm; Second structural sheet 52 adopts AC-20C type asphalt, and thickness is 6cm; The 3rd structural sheet 53 adopts AC-13C type asphalt, and thickness is 4cm; First tack coat 54 and second tack coat 55 all adopt modified emulsifying asphalt, and thickness is 0.3mm.
(2) pre-press is installed;
Like Fig. 1 and shown in Figure 2.Form by 1 square floor, 3,4 guide rods 2 of 1,1 square top board and 4 clamping screws 4.Base plate 1 is the square steel plate that the length of side is 20cm with top board 3, and thickness is 1cm.
Right cylinder test specimen 5 is placed on base plate 1 middle part of pre-press, and top board 3 is installed.
(3) precompressed, locking right cylinder test specimen.
Be under 20 ℃ the environment, right cylinder test specimen 5 to be placed on the pressing machine loaded seat together with pre-press vertically in room temperature, apply the pressure (that is: the compressive stress that is applied on the shear surface is 0.707MPa) of 5549.95N for the right cylinder test specimen through top board 3; Then, tighten clamping screw 4 gradually, return zero until the manometric reading of pressing machine, thereby guarantee locking right cylinder test specimen 5, the compressive stress on shear surface is 0.707MPa.
(4) shearing component is installed, is carried out shear test.
Like Fig. 3 and shown in Figure 4, form with the shearing pressure head by shearing base.Shearing pressure head and right cylinder test specimen surface of contact is that diameter is the face of cylinder of 10cm.
Wherein, a and c represent to shear the length of the contact site of base 61 among the figure, and wherein, a is 4cm, and c is 4cm; B representes the length of dead slot, and d representes the width of base, and h representes the height of dead slot, and b is second structural sheet, first tack coat and the second adhesive layer thickness sum and adds 1cm; In this enforcement, b is 7.6cm; D is 5cm; H is 4cm.
Shear the surface of contact length that pressure head 62 size e represent to shear pressure head and right cylinder test specimen, f representes to shear the interface width of pressure head and right cylinder test specimen, and g representes to shear the height of pressure head; Wherein, e is 4cm, and f is 5cm, and g is 4cm.
Test temperature is 25 ℃.Be installed on the loaded seat of pressing machine shearing base 61; Right cylinder test specimen 5 with locking is disposed across on the shearing base 61 immediately; To shear pressure head 62 and be installed on the right cylinder test specimen 5, and the center line of the center line of the center line of shearing pressure head 62 and second structural sheet 52 and shearing base 61 is on same straight line.Load through shearing pressure head 62, carry out shear test.The time that locks onto the beginning shear test from right cylinder test specimen 5 is 2min.Test findings shows that maximum shear is 1.51 MPa.
Embodiment 2
Present embodiment is except that subordinate's characteristic, and other are all identical with embodiment 1:
In the present embodiment, adopt the on-the-spot road surface core of getting core.
Certain asphalt pavement of highway upper layer is a SMA-13 type asphalt, and thickness is 4cm; Middle surface layer is an AC-20C type asphalt, and thickness is 6cm; Following surface layer is the AC-25C asphalt, and thickness is 8cm; Upward, the tack coat between the middle surface layer is the thick modified emulsifying asphalt of 0.4mm; In, down the tack coat between the surface layer is the thick modified emulsifying asphalt of 0.5mm.
Behind the pavement construction 3 days, use corning machine to drill through diameter, be used for shear test of the present invention as the bituminous pavement upper layer of 10cm, tack coat, middle surface layer, tack coat, continuous, the complete core of surface layer down.Wherein, following surface layer is first structural sheet of the present invention, and middle surface layer is second structural sheet, and upper layer is the 3rd structural sheet, in, down the tack coat between the surface layer is first tack coat, go up, the tack coat between the middle surface layer is second tack coat.
(2) pre-press is installed.
Like Fig. 1 and shown in Figure 2.Form by 1 square floor, 1 square top board, 4 guide rods and 4 clamping screws.Base plate and top board are the square steel plate that the length of side is 20cm, and thickness is 1cm.
The right cylinder test specimen is placed on the base plate middle part of pre-press, and top board is installed.
(3) precompressed, locking right cylinder test specimen.
Like Fig. 3 and shown in Figure 4; Be under 20 ℃ the environment in room temperature; The right cylinder test specimen is placed on the pressing machine loaded seat together with pre-press vertically, applies the pressure (that is: the compressive stress that is applied on the shear surface is 0.8MPa) of 6280N for the right cylinder test specimen through top board; Then, tighten clamping screw gradually, return zero until the manometric reading of pressing machine, thereby guarantee locking right cylinder test specimen, the compressive stress on shear surface is 0.8MPa.
(4) shearing component is installed, is carried out shear test.
Shear such as Fig. 3 and shown in Figure 4.Form with the shearing pressure head by shearing base.With the test specimen surface of contact be that diameter is the face of cylinder of 10cm.Wherein, the size a of shearing base is 4cm; C is 4cm; B is 7.9cm; D is 5cm; H is 4cm.Shearing pressure head size e is 4cm; F is 5cm; G is 4cm.
Test temperature is 20 ℃.Be installed on the loaded seat of pressing machine shearing base; Test specimen with locking is disposed across on the shearing base immediately; Install and shear pressure head; The center line of the center line of feasible shearing pressure head and the center line of test specimen second structural sheet and shearing base is on same straight line.Load through shearing pressure head, carry out shear test.The time that locks onto the beginning shear test from test specimen is 3min.Test findings shows that maximum shear is 1.72 MPa.
The foregoing description is merely preferred embodiment of the present invention, is not to be used for limiting practical range of the present invention.Be that all equalizations of doing according to content of the present invention change and modification, all contained by claim of the present invention scope required for protection.
Claims (10)
1. a bituminous pavement right cylinder test specimen interlayer shear device comprises shearing component and pressing machine; It is characterized in that:
Also comprise pre-press, pressing machine comprises loaded seat, and pre-press places on the loaded seat, and pre-press is built-in with the right cylinder test specimen; Pre-press is through pressing machine locking right cylinder test specimen;
The right cylinder test specimen comprises first structural sheet, second structural sheet and the 3rd structural sheet, is connected through first tack coat between first structural sheet and second structural sheet, is connected through second tack coat between second structural sheet and the 3rd structural sheet;
Shearing component comprises to be sheared pressure head and shears base; Shear base and be loaded on the loaded seat, and shear center and be provided with dead slot, the dead slot symmetria bilateralis is provided with contact site, and contact site contacts with first structural sheet, the 3rd structural sheet respectively;
Shear pressure head and be installed on the right cylinder test specimen of traverse, and the center line of shearing pressure head, second structural sheet, shearing base and dead slot is on same straight line; Shear the thickness of the surface of contact length of pressure head and right cylinder test specimen less than second structural sheet; The length of dead slot is greater than the thickness sum of second structural sheet, first tack coat and second tack coat, and less than the thickness sum of first structural sheet, second structural sheet, the 3rd structural sheet, first tack coat and second tack coat.
2. bituminous pavement right cylinder test specimen interlayer shear device according to claim 1, it is characterized in that: said shearing pressure head contacts with the right cylinder test specimen, and the diameter of surface of contact is consistent with the diameter dimension of right cylinder test specimen.
3. bituminous pavement right cylinder test specimen interlayer shear device according to claim 1, it is characterized in that: said pre-press also comprises base plate, top board and guide rod; Said base plate places the bottom of right cylinder test specimen, and said top board places the top of right cylinder test specimen; Said guide rod one end is installed on the top board through clamping screw, and the other end places on the base plate; Said pressing machine lock onto the right cylinder test specimen in the pre-press through clamping screw.
4. bituminous pavement right cylinder test specimen interlayer shear device according to claim 3, it is characterized in that: the quantity of said guide rod is 4,4 follow guide rod to be in turn connected into square.
5. bituminous pavement right cylinder test specimen interlayer shear device according to claim 1 is characterized in that: said right cylinder test specimen adopts indoor gyratory compaction method layering to make.
6. bituminous pavement right cylinder test specimen interlayer shear device according to claim 1 is characterized in that: said right cylinder test specimen is for adopting the on-the-spot road surface core of getting core.
7. bituminous pavement right cylinder test specimen interlayer shear device according to claim 1, it is characterized in that: the constituent material of first structural sheet, second structural sheet and the 3rd structural sheet is asphalt; First tack coat and second tack coat all adopt asphalt material.
8. according to each described bituminous pavement right cylinder test specimen interlayer shear device of claim 1-7, it is characterized in that: said right cylinder test specimen diameter is 9cm～11cm; Wherein, the thickness of first structural sheet is 4cm～10cm; The thickness of second structural sheet is 4cm～6cm; The thickness of the 3rd structural sheet is 4cm～10cm; The thickness of first tack coat and second tack coat is 0mm～2mm.
9. one kind like each described bituminous pavement right cylinder test specimen interlayer shear method of claim 1-8, it is characterized in that may further comprise the steps:
1) pre-press is installed: pre-press comprises base plate, top board, guide rod and clamping screw; Base plate places the bottom of right cylinder test specimen, and top board places the top of right cylinder test specimen, and said guide rod one end is installed on the top board through clamping screw, and the other end places on the base plate;
2) precompressed, locking right cylinder test specimen: the pre-press that the right cylinder test specimen will be housed is placed on the loaded seat of pressing machine vertically, exerts pressure for the right cylinder test specimen through top board; Then, tighten clamping screw gradually, return zero, thereby guarantee that pressing machine lock onto the right cylinder test specimen in the pre-press through clamping screw until the pressure gauge reading of pressing machine;
3) install to shear: will shear on the loaded seat that base is installed in pressing machine; With step 2) in the right cylinder test specimen of locking be disposed across and shear on the base; Shearing component comprises to be sheared pressure head and shears base; Shear base and be loaded on the loaded seat, and shear center and be provided with dead slot, the relative symmetria bilateralis of dead slot is provided with contact site, and contact site contacts with first structural sheet, the 3rd structural sheet respectively; With the right cylinder test specimen traverse after the locking and be loaded on and shear on the base, shear pressure head and be installed on the right cylinder test specimen, and shear pressure head, second structural sheet, the center line of shearing base and dead slot is on same straight line; Shear the thickness of the surface of contact length of pressure head and right cylinder test specimen less than second structural sheet, the length of dead slot is greater than the thickness sum of second structural sheet, first tack coat and second tack coat; Through shearing pressure head the right cylinder test specimen is loaded, thereby carry out shear test.
10. bituminous pavement right cylinder test specimen interlayer shear method according to claim 9; It is characterized in that: step 2) in; Be to reduce the deformation of creep and the stress relaxation that produce after the precompressed of right cylinder test specimen, said right cylinder test specimen is from locking onto time of beginning to shear in 5min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210302979.9A CN102830021B (en) | 2012-08-24 | 2012-08-24 | Interlaminar shear device of cylindrical test piece of bituminous paving and shearing method thereof |
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| CN201210302979.9A CN102830021B (en) | 2012-08-24 | 2012-08-24 | Interlaminar shear device of cylindrical test piece of bituminous paving and shearing method thereof |
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| CN103207120A (en) * | 2013-03-12 | 2013-07-17 | 大连理工大学 | Test device and test method for asphalt rotational shear creep and repeated creep recovery |
| CN104215365A (en) * | 2014-09-03 | 2014-12-17 | 哈尔滨工业大学 | Pavement structure layer internal shearing stress testing sensor and embedding technology and application thereof |
| CN104316416A (en) * | 2014-11-18 | 2015-01-28 | 东南大学 | Semicircle loading direct shear test device and method for bituminous mixture |
| CN105300758A (en) * | 2015-09-24 | 2016-02-03 | 哈尔滨工业大学 | Asphalt mortar molding and measuring devices and testing method of dynamic shear parameters of asphalt mortar |
| CN110376038A (en) * | 2019-08-02 | 2019-10-25 | 哈尔滨工业大学 | A kind of sandwich specimen molding device accurately controlling asphalt membrane thickness |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103207120A (en) * | 2013-03-12 | 2013-07-17 | 大连理工大学 | Test device and test method for asphalt rotational shear creep and repeated creep recovery |
| CN103207120B (en) * | 2013-03-12 | 2014-12-24 | 大连理工大学 | Test device and test method for asphalt rotational shear creep and repeated creep recovery |
| CN104215365A (en) * | 2014-09-03 | 2014-12-17 | 哈尔滨工业大学 | Pavement structure layer internal shearing stress testing sensor and embedding technology and application thereof |
| CN104316416A (en) * | 2014-11-18 | 2015-01-28 | 东南大学 | Semicircle loading direct shear test device and method for bituminous mixture |
| CN104316416B (en) * | 2014-11-18 | 2016-09-14 | 东南大学 | A kind of asphalt semicircle loads direct shear test device and test method thereof |
| CN105300758A (en) * | 2015-09-24 | 2016-02-03 | 哈尔滨工业大学 | Asphalt mortar molding and measuring devices and testing method of dynamic shear parameters of asphalt mortar |
| CN105300758B (en) * | 2015-09-24 | 2018-04-24 | 哈尔滨工业大学 | The test method of asphalt mortar, bituminous mortar shaping, measuring device and its asphalt mortar, bituminous mortar dynamic shearing parameter |
| CN110376038A (en) * | 2019-08-02 | 2019-10-25 | 哈尔滨工业大学 | A kind of sandwich specimen molding device accurately controlling asphalt membrane thickness |
| CN110376038B (en) * | 2019-08-02 | 2021-12-10 | 哈尔滨工业大学 | Sandwich test piece forming device capable of accurately controlling thickness of asphalt film |
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| CN102830021B (en) | 2014-06-11 |
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