CN202748276U - Shearing device for asphalt pavement cylinder test specimen layer - Google Patents
Shearing device for asphalt pavement cylinder test specimen layer Download PDFInfo
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- CN202748276U CN202748276U CN 201220421810 CN201220421810U CN202748276U CN 202748276 U CN202748276 U CN 202748276U CN 201220421810 CN201220421810 CN 201220421810 CN 201220421810 U CN201220421810 U CN 201220421810U CN 202748276 U CN202748276 U CN 202748276U
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Abstract
The utility mode discloses a shearing device for an asphalt pavement cylinder test specimen layer. The shearing device for the asphalt pavement cylinder test specimen layer comprises a shearing assembly, a press machine, and a cylinder test specimen, and further comprises a prepressing component which is used to tightly lock the cylinder test specimen. The shearing assembly comprises a shearing pressure head and a shearing base. The shearing base is arranged on a loading base, and an empty groove is arranged in the center of the shearing base. Contact parts are arranged on two sides of the empty groove in a symmetrical mode. The contact parts are respectively connected with a first structure layer and a third structure layer. According to the shearing device for the asphalt pavement cylinder test specimen layer, shearing strength is exerted in a symmetrical mode, and therefore counter torque to an instrument caused by eccentric loading is eliminated, and damages to an instrumental loading device are avoided.
Description
Technical field
The utility model relates to highway engineering asphalt pavement material and structural research technical field, relates in particular to a kind of bituminous pavement right cylinder test specimen interlayer shear device.
Background technology
Asphalt material thin layer for the bonding spread between each structural sheet of strengthening bituminous pavement is called tack coat.Tack coat bears the effect of traffic loading jointly so that each structural sheet of road surface becomes integral body.The performance road pavement structure usability impact of tack coat significantly.Bonding is not firm between the road surface structare layer, and under Driving Loading, the road surface is prone to passing, gathers around the multiple diseases such as bag and cracking.In general, can estimate by indoor shear test the performance of tack coat.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 ": and centre block by rolling moulding 2 laminates sandwiches the right cylinder test specimen of tack coat first, then bore core 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 charger bias-load produced counter torque to instrument, fragile instrument; (2) bear simultaneously compressive stress and shear stress effect on the shear surface between the actual road surface structare layer, and the shearing test method in the Liu Li PhD dissertation can't apply compressive stress at shear surface.
The utility model content
Goal of the invention of the present utility model is the technical deficiency for existing highway engineering bituminous pavement shear and cutting method, and a kind of bituminous pavement right cylinder test specimen interlayer shear device is provided.
For achieving the above object, the technical solution adopted in the utility model 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 by pressing machine locking right cylinder test specimen;
Comprise that also pressing machine comprises loaded seat and mechanics sensor for the pre-press of locking right cylinder test specimen, described mechanics sensor is connected with the clamping screw of pre-press, is used for measuring pre-press to right cylinder test specimen applied pressure;
The right cylinder test specimen comprises the first structural sheet, the second structural sheet, the 3rd structural sheet, is connected by the first tack coat between the first structural sheet and the second structural sheet, is connected by the second tack coat between the 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 the base center and be provided with dead slot, the relative symmetria bilateralis of dead slot is provided with contact site, and contact site contacts with the 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, the second structural sheet, shearing base and dead slot is on the same straight line; Shear the surface of contact length of pressure head and right cylinder test specimen less than the thickness of the second structural sheet; The length of dead slot is greater than the thickness sum of the second structural sheet, the first tack coat and the second tack coat, and less than the thickness sum of the first structural sheet, the second structural sheet, the 3rd structural sheet, the first tack coat and the second tack coat.
Preferably, described 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, described pre-press also comprises base plate, top board and guide rod; Described base plate places the bottom of right cylinder test specimen, and described top board places the top of right cylinder test specimen; Described guide rod one end is installed on the top board by clamping screw, and the other end places on the base plate; Described pressing machine lock onto the right cylinder test specimen in the pre-press by clamping screw.
Preferably, the quantity of described guide rod is 4, and 4 follow guide rod to be in turn connected into square.
One of preferred version, described 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 the first structural sheet according to thickness and the material requirements of the first structural sheet; When treating that the first structural sheet is down to room temperature, smear sticking material at the first structural sheet upper surface, form the first tack coat; Then, at the asphalt of the first tack coat continuation filling the second structural sheet, make the second structural sheet; When treating that the second structural sheet temperature is down to room temperature, smear sticking material at the second structural sheet upper surface, form the second tack coat; At last, at the asphalt of the second tack coat continuation filling the 3rd structural sheet, make the 3rd structural sheet according to the thickness of the 3rd structural sheet, when treating that right cylinder test specimen temperature is down to room temperature, namely can be used for shear test of the present utility model.
Two of preferred version, described right cylinder test specimen is for adopting the on-the-spot road surface core of getting core.When bituminous pavement is made of upper layer, tack coat, middle surface layer, tack coat, the Sub, and the thickness of each structural sheet is in the thickness range of the utility model the first structural sheet, the second structural sheet and the 3rd structural sheet the time, drill through the core of the continuous whole of bituminous pavement upper layer, tack coat, middle surface layer, tack coat and the Sub that diameter is 10cm with corning machine, be used for the utility model shear test.
Preferably, the constituent material of the first structural sheet, the second structural sheet and the 3rd structural sheet is asphalt; The first tack coat and the second tack coat all adopt asphalt material.
Preferably, described right cylinder test specimen diameter is 9cm～11cm; Wherein, the thickness of the first structural sheet is 4cm～10cm; The thickness of the second structural sheet is 4cm～6cm; The thickness of the 3rd structural sheet is 4cm～10cm; The thickness of the first tack coat and the second tack coat is 0mm～2mm.
Further, the utility model 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 described guide rod one end is installed on the top board by 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 to the right cylinder test specimen by top board; Then, tighten gradually clamping screw, until the pressure gauge reading of pressing machine returns zero, thereby guarantee that pressing machine lock onto the right cylinder test specimen in the pre-press by clamping screw;
3) shearing is installed: will shear floor installation on the loaded seat of 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 the base center and be provided with dead slot, the relative symmetria bilateralis of dead slot is provided with contact site, and contact site contacts with the 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, the second structural sheet, shear the center line of base and dead slot on the same straight line; Shear the surface of contact length of pressure head and right cylinder test specimen less than the thickness of the second structural sheet, the length of dead slot is greater than the thickness sum of the second structural sheet, the first tack coat and the second tack coat; By 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, described right cylinder test specimen is from locking onto time of beginning to shear in 5min.
The utility model has following beneficial effect with respect to prior art:
(1) the utility model bituminous pavement right cylinder test specimen interlayer shear device and cutting method thereof, symmetry applies shear stress on the right cylinder test specimen, has eliminated the counter torque of bias-load to instrument, thereby has avoided the damage to the instrument charger;
(2) the utility model bituminous pavement right cylinder test specimen interlayer shear device and cutting method thereof, first precompressed is sheared again, can apply simultaneously compressive stress and shear stress, the stress on more realistic road surface on shear surface.
Description of drawings
Fig. 1 is the front view after the test specimen of right cylinder test specimen of the utility model bituminous pavement right cylinder test specimen interlayer shear device and pre-press are installed;
Fig. 2 is the vertical view after the test specimen of right cylinder test specimen of the utility model bituminous pavement right cylinder test specimen interlayer shear device and pre-press are installed;
Fig. 3 is the main cut-open view after right cylinder test specimen of the present utility model, pre-press and shearing component are installed;
Fig. 4 is the right view after right cylinder test specimen of the present utility model, pre-press and shearing component are installed.
Embodiment
Below in conjunction with the drawings and specific embodiments utility model purpose of the present utility model is described in further detail, embodiment can not give unnecessary details one by one at this, but therefore embodiment of the present utility model is not defined in following examples.Unless stated otherwise, material and the job operation of the utility model employing are the art conventional material and job operation.
Embodiment 1
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 Mixture Experiment rules " (JTG E20-2011), the required right cylinder test specimen of the utility model 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 by gyratory compaction AC-25C type asphalt is the first structural sheet 51 of 10cm; When treating that the first structural sheet 51 temperature are down to room temperature, at the first structural sheet 51 surface modification emulsified asphalts, smearing thickness is 0.3mm, behind the emulsified asphalt breakdown of emulsion, forms the first tack coat 54; Then, continue to fill AC-20C type asphalt at the first tack coat 54, making thickness by gyratory compaction is the second structural sheet 52 of 6cm; When treating that right cylinder test specimen temperature is down to room temperature, smear modified emulsifying asphalt on right cylinder test specimen surface, smearing thickness is 0.3mm, behind the emulsified asphalt breakdown of emulsion, forms the second tack coat 55; At last, continue to fill AC-13C type asphalt at the second tack coat 55, making thickness by gyratory compaction is the 3rd structural sheet 53 of 4cm, when treating that right cylinder test specimen 5 temperature are down to room temperature, namely can be used for shear test of the present utility model.
These right cylinder test specimen 5 diameters are 10cm.Wherein, the first structural sheet 51 adopts AC-25C type asphalt, and thickness is 10cm; The 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; The first tack coat 54 and the second tack coat 55 all adopt modified emulsifying asphalt, and thickness is 0.3mm.
(2) pre-press is installed;
Such as Fig. 1 and shown in Figure 2.Formed by 1 square floor 1,1 square top board 3,4 guide rods 2 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 vertically together with pre-press 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 by top board 3; Then, tighten gradually clamping screw 4, until the manometric reading of pressing machine returns zero, 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.
As shown in Figure 3 and Figure 4, form by shearing base and shearing pressure head.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 represents the length of dead slot, and d represents the width of base, and h represents the height of dead slot, and b is the second structural sheet, the 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 represents to shear the interface width of pressure head and right cylinder test specimen, and g represents 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 the second structural sheet 52 and shearing base 61 is on the same straight line.Load by 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 subordinate's feature, 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 SMA-13 type asphalt, and thickness is 4cm; Middle surface layer is AC-20C type asphalt, and thickness is 6cm; The Sub 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, the tack coat between the Sub is the thick modified emulsifying asphalt of 0.5mm.
Behind the pavement construction 3 days, drill through continuous, the complete core of bituminous pavement upper layer that diameter is 10cm, tack coat, middle surface layer, tack coat, the Sub with corning machine, be used for the utility model shear test.Wherein, the Sub is the first structural sheet of the present utility model, and middle surface layer is the second structural sheet, and upper layer is the 3rd structural sheet, in, the tack coat between the Sub is the first tack coat, the tack coat between upper, the middle surface layer is the second tack coat.
(2) pre-press is installed.
Such as Fig. 1 and shown in Figure 2.Formed 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.
As shown in Figure 3 and Figure 4, be under 20 ℃ the environment in room temperature, the right cylinder test specimen is placed on the pressing machine loaded seat vertically together with pre-press, applies the pressure (that is: the compressive stress that is applied on the shear surface is 0.8MPa) of 6280N by top board to the right cylinder test specimen; Then, tighten gradually clamping screw, until the manometric reading of pressing machine returns zero, 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 as shown in Figure 3 and Figure 4.Form by shearing base and shearing pressure head.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 ℃.To shear floor installation on the loaded seat of pressing machine; Test specimen with locking is disposed across on the shearing base immediately; Install and shear pressure head; So that the center line of the center line of the center line of shearing pressure head and test specimen the second structural sheet and shearing base is on the same straight line.Load by 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.
Above-described embodiment is preferred embodiment of the present utility model only, is not to limit practical range of the present utility model.Be that all equalizations of doing according to the utility model content change and modification, all contained by the utility model claim scope required for protection.
Claims (8)
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 by pressing machine locking right cylinder test specimen;
The right cylinder test specimen comprises the first structural sheet, the second structural sheet and the 3rd structural sheet, is connected by the first tack coat between the first structural sheet and the second structural sheet, is connected by the second tack coat between the 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 the base center and be provided with dead slot, the dead slot symmetria bilateralis is provided with contact site, and contact site contacts with the 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, the second structural sheet, shearing base and dead slot is on the same straight line; Shear the surface of contact length of pressure head and right cylinder test specimen less than the thickness of the second structural sheet; The length of dead slot is greater than the thickness sum of the second structural sheet, the first tack coat and the second tack coat, and less than the thickness sum of the first structural sheet, the second structural sheet, the 3rd structural sheet, the first tack coat and the second tack coat.
2. bituminous pavement right cylinder test specimen interlayer shear device according to claim 1, it is characterized in that: described 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: described pre-press also comprises base plate, top board and guide rod; Described base plate places the bottom of right cylinder test specimen, and described top board places the top of right cylinder test specimen; Described guide rod one end is installed on the top board by clamping screw, and the other end places on the base plate; Described pressing machine lock onto the right cylinder test specimen in the pre-press by clamping screw.
4. bituminous pavement right cylinder test specimen interlayer shear device according to claim 3, it is characterized in that: the quantity of described guide rod is 4,4 are in turn connected into square with guide rod.
5. bituminous pavement right cylinder test specimen interlayer shear device according to claim 1 is characterized in that: described 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: described 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 the first structural sheet, the second structural sheet and the 3rd structural sheet is asphalt; The first tack coat and the second tack coat all adopt asphalt material.
8. each described bituminous pavement right cylinder test specimen interlayer shear device according to claim 1-7, it is characterized in that: described right cylinder test specimen diameter is 9cm～11cm; Wherein, the thickness of the first structural sheet is 4cm～10cm; The thickness of the second structural sheet is 4cm～6cm; The thickness of the 3rd structural sheet is 4cm～10cm; The thickness of the first tack coat and the second tack coat is 0mm～2mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220421810 CN202748276U (en) | 2012-08-24 | 2012-08-24 | Shearing device for asphalt pavement cylinder test specimen layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220421810 CN202748276U (en) | 2012-08-24 | 2012-08-24 | Shearing device for asphalt pavement cylinder test specimen layer |
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| CN202748276U true CN202748276U (en) | 2013-02-20 |
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| CN 201220421810 Withdrawn - After Issue CN202748276U (en) | 2012-08-24 | 2012-08-24 | Shearing device for asphalt pavement cylinder test specimen layer |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102830021A (en) * | 2012-08-24 | 2012-12-19 | 华南理工大学 | Interlaminar shear device of cylindrical test piece of bituminous paving and shearing method thereof |
| CN103698229A (en) * | 2013-12-04 | 2014-04-02 | 长安大学 | Testing device for anti-fatigue shear performance between bonding layers of asphalt pavement and testing method thereof |
| CN105181493A (en) * | 2015-10-09 | 2015-12-23 | 南京理工大学 | Steel and concrete interface fatigue test device |
| CN106338436A (en) * | 2016-08-24 | 2017-01-18 | 济南金光仪器设备制造有限公司 | Intelligent hydraulic modeling sand strength tester and testing method thereof |
| CN106644685A (en) * | 2016-08-11 | 2017-05-10 | 重庆大学 | Pressure loading device for pressing test |
| CN108240965A (en) * | 2017-12-06 | 2018-07-03 | 江西省高速公路投资集团有限责任公司 | A kind of bituminous paving interlayer adhesion strength detection device and its detection method |
| CN109374434A (en) * | 2018-09-05 | 2019-02-22 | 华北水利水电大学 | Asphalt concrete pavement material shearing performance test device |
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2012
- 2012-08-24 CN CN 201220421810 patent/CN202748276U/en not_active Withdrawn - After Issue
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102830021A (en) * | 2012-08-24 | 2012-12-19 | 华南理工大学 | Interlaminar shear device of cylindrical test piece of bituminous paving and shearing method thereof |
| CN103698229A (en) * | 2013-12-04 | 2014-04-02 | 长安大学 | Testing device for anti-fatigue shear performance between bonding layers of asphalt pavement and testing method thereof |
| CN105181493A (en) * | 2015-10-09 | 2015-12-23 | 南京理工大学 | Steel and concrete interface fatigue test device |
| CN105181493B (en) * | 2015-10-09 | 2018-10-02 | 南京理工大学 | Steel and concrete interface fatigue experimental device |
| CN106644685A (en) * | 2016-08-11 | 2017-05-10 | 重庆大学 | Pressure loading device for pressing test |
| CN106338436A (en) * | 2016-08-24 | 2017-01-18 | 济南金光仪器设备制造有限公司 | Intelligent hydraulic modeling sand strength tester and testing method thereof |
| CN108240965A (en) * | 2017-12-06 | 2018-07-03 | 江西省高速公路投资集团有限责任公司 | A kind of bituminous paving interlayer adhesion strength detection device and its detection method |
| CN109374434A (en) * | 2018-09-05 | 2019-02-22 | 华北水利水电大学 | Asphalt concrete pavement material shearing performance test device |
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Granted publication date: 20130220 Effective date of abandoning: 20140611 |
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