CN102830021B - 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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- CN102830021B CN102830021B CN201210302979.9A CN201210302979A CN102830021B CN 102830021 B CN102830021 B CN 102830021B CN 201210302979 A CN201210302979 A CN 201210302979A CN 102830021 B CN102830021 B CN 102830021B
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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
For the asphalt material thin layer of the bonding spread between each structural sheet of reinforcement bituminous pavement, be called tack coat.Tack coat makes the each structural sheet in road surface become entirety, jointly bears the effect of traffic loading.The performance road pavement structure usability impact of tack coat significantly.Between road surface structare layer, bonding is not firm, and under Driving Loading, road surface is prone to passing, gathers around the multiple diseases such as bag and cracking.In general, can evaluate 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 ": the first and middle right cylinder test specimen that sandwich tack coat block by rolling moulding 2 laminates, then bore core and obtain right cylinder test specimen, right cylinder test specimen is used for to shear test.
The problem that this test unit and test method exist is: (1), in the time that right cylinder test specimen is carried out to shear test, charger bias-load produces counter torque to instrument, fragile instrument; (2) on the shear surface between actual road surface structare layer, bear compressive stress and shear stress effect, and shearing test method in Liu Li PhD dissertation cannot apply compressive stress on shear surface simultaneously.
Summary of the invention
Goal of the invention of the present invention 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.
Further, provide a kind of bituminous pavement right cylinder test specimen interlayer shear method.
For achieving the above object, the technical solution used in the present invention 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 is placed in loaded seat, and pre-press is built-in with right cylinder test specimen; Pre-press is locked right cylinder test specimen by pressing machine;
Right cylinder test specimen comprises the first structural sheet, the second structural sheet, the 3rd structural sheet, between the first structural sheet and the second structural sheet, is connected by the first tack coat, between the second structural sheet and the 3rd structural sheet, is connected by the second tack coat;
Shearing component comprises to be sheared pressure head and shears base; Shear base be loaded in loaded seat, and shear base center be provided with dead slot, the relative symmetria bilateralis of dead slot is provided with contact site, 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 same straight line; The surface of contact length of shearing pressure head and right cylinder test specimen is 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 is 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 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 is placed in the bottom of right cylinder test specimen, and described top board is placed in the top of right cylinder test specimen; Described guide rod one end is installed on top board by clamping screw, and the other end is placed on base plate; Described pressing machine lock onto right cylinder test specimen in pre-press by clamping screw.
Preferably, the quantity of described guide rod is 4, and 4 are in turn connected into square with guide rod.
One of preferred version, described right cylinder test specimen adopts indoor gyratory compaction method layering to make right cylinder test specimen.First selecting internal diameter is the die trial that 10cm, length are 30cm; In die trial bottom, make the first structural sheet according to the thickness of the first structural sheet and material requirements; In the time 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, on the first tack coat, continue to fill the asphalt of the second structural sheet, make the second structural sheet; In the time 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; Finally, on the second tack coat, continue to fill the asphalt of the 3rd structural sheet, make the 3rd structural sheet according to the thickness of the 3rd structural sheet, in the time that right cylinder test specimen temperature is down to room temperature, can be used for shear test of the present invention.
Two of preferred version, described right cylinder test specimen is to adopt 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, lower surface layer, and the thickness of each structural sheet is in the thickness range of the present invention's the first structural sheet, the second structural sheet and the 3rd structural sheet time, drill through the core of the continuous whole of bituminous pavement upper layer, tack coat, middle surface layer, tack coat and lower surface layer that diameter is 10cm with corning machine, for shear test of the present invention.
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 invention provides a kind of bituminous pavement right cylinder test specimen interlayer shear method, comprise the following steps:
1) pre-press is installed: pre-press comprises base plate, top board, guide rod and clamping screw; Base plate is placed in the bottom of right cylinder test specimen, and top board is placed in the top of right cylinder test specimen, and described guide rod one end is installed on top board by clamping screw, and the other end is placed on base plate;
2) precompressed, locking right cylinder test specimen: the pre-press that right cylinder test specimen is housed is placed in the loaded seat of pressing machine vertically, exerts pressure to right cylinder test specimen by top board; Then, tighten gradually clamping screw, until the pressure gauge reading back to zero of pressing machine, thereby guarantee that pressing machine lock onto right cylinder test specimen in pre-press by clamping screw;
3) install and shear: will shear floor installation in the loaded seat of pressing machine; By step 2) in the right cylinder test specimen of locking be disposed across and shear on base; Shearing component comprises to be sheared pressure head and shears base; Shear base be loaded in loaded seat, and shear base center be provided with dead slot, the relative symmetria bilateralis of dead slot is provided with contact site, contact site contacts with the first structural sheet, the 3rd structural sheet respectively; By the right cylinder test specimen traverse after locking and be loaded on and shear on base, shear pressure head and be installed on right cylinder test specimen, and shear pressure head, the second structural sheet, the center line of shearing base and dead slot is on same straight line; The surface of contact length of shearing pressure head and right cylinder test specimen is less than the thickness of the second structural sheet, and 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, right cylinder test specimen is loaded, thereby carry out shear test.
Preferably, step 2) in, for reducing the deformation of creep and the stress relaxation that produce after the precompressed of right cylinder test specimen, described right cylinder test specimen is from locking onto the time that starts to shear in 5min.
The present invention, with respect to prior art, has following beneficial effect:
(1) bituminous pavement right cylinder test specimen interlayer shear device of the present invention and cutting method thereof, on right cylinder test specimen, symmetry applies shear stress, has eliminated the counter torque of bias-load to instrument, thereby has avoided the damage to 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, the stress on more realistic road surface simultaneously.
Accompanying drawing explanation
Fig. 1 is the front view after the test specimen of right cylinder test specimen of bituminous pavement right cylinder test specimen interlayer shear device of the present invention and pre-press are installed;
Fig. 2 is the vertical view after the test specimen of right cylinder test specimen of bituminous pavement right cylinder test specimen interlayer shear device of the present invention and pre-press are installed;
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 the drawings and specific embodiments, goal of the invention of the present invention is described in further detail, embodiment can not repeat one by one at this, but therefore embodiments of the present invention are not defined in following examples.Unless stated otherwise, the present invention adopts material and job operation are the art conventional material and job operation.
In the present embodiment, adopt indoor gyratory compaction method layering to make 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), right cylinder test specimen required for the present invention is made in layering.Selection internal diameter is 10cm, the die trial that length is 30cm; In die trial bottom, make by gyratory compaction AC-25C type asphalt the first structural sheet 51 that thickness is 10cm; In the time 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, after emulsified asphalt breakdown of emulsion, forms the first tack coat 54; Then, on the first tack coat 54, continue to fill AC-20C type asphalt, make by gyratory compaction the second structural sheet 52 that thickness is 6cm; In the time 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, after emulsified asphalt breakdown of emulsion, forms the second tack coat 55; Finally, on the second tack coat 55, continue to fill AC-13C type asphalt, make by gyratory compaction the 3rd structural sheet 53 that thickness is 4cm, in the time that right cylinder test specimen 5 temperature are down to room temperature, can be used for shear test of the present invention.
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;
As shown in Figures 1 and 2.Formed by 2 and 4 clamping screws 4 of 1 square floor, 3,4 guide rods of 1,1 square top board.Base plate 1 is with top board 3 the square steel plate that the length of side is 20cm, and thickness is 1cm.
Right cylinder test specimen 5 is placed on to base plate 1 middle part of pre-press, and top board 3 is installed.
(3) precompressed, locking right cylinder test specimen.
Be, under the environment of 20 ℃, right cylinder test specimen 5 to be placed in pressing machine loaded seat vertically together with pre-press in room temperature, apply the pressure (that is: the compressive stress being applied on shear surface is 0.707MPa) of 5549.95N to right cylinder test specimen by top board 3; Then, tighten gradually clamping screw 4, until the manometric reading back to zero of pressing machine, thereby guaranteeing 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, in figure, a and c represent the length of the contact site of shearing base 61, 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 arranged in the loaded seat of pressing machine shearing base 61; Immediately the right cylinder test specimen 5 of locking is disposed across and shears on base 61; Shearing pressure head 62 is installed on right cylinder test specimen 5, and the center line of shearing the center line of pressure head 62 and the center line of the second structural sheet 52 and shearing base 61 is on same straight line.Load by shearing pressure head 62, carry out shear test.The time that locks onto beginning shear test from right cylinder test specimen 5 is 2min.Test findings demonstration, maximum shear is 1.51 MPa.
embodiment 2
The 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; Lower surface layer is AC-25C asphalt, and thickness is 8cm; Above, the tack coat between middle surface layer is the modified emulsifying asphalt that 0.4mm is thick; In, tack coat between lower surface layer is the modified emulsifying asphalt that 0.5mm is thick.
After 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, lower surface layer with corning machine, for shear test of the present invention.Wherein, lower surface layer is the first structural sheet of the present invention, and middle surface layer is the second structural sheet, and upper layer is the 3rd structural sheet, in, tack coat between lower surface layer is the first tack coat, the tack coat between upper, middle surface layer is the second tack coat.
(2) pre-press is installed.
As shown in Figures 1 and 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.
Right cylinder test specimen is placed on to 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 the environment of 20 ℃ in room temperature, right cylinder test specimen is placed in pressing machine loaded seat vertically together with pre-press, applies the pressure (that is: the compressive stress being applied on shear surface is 0.8MPa) of 6280N by top board to right cylinder test specimen; Then, tighten gradually clamping screw, until the manometric reading back to zero of pressing machine, thereby guaranteeing 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 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 in the loaded seat of pressing machine; Immediately the test specimen of locking is disposed across and shears on base; Install and shear pressure head; Make the center line of shearing the center line of pressure head and the center line of test specimen the second structural sheet and shearing base on same straight line.Load by shearing pressure head, carry out shear test.The time that locks onto beginning shear test from test specimen is 3min.Test findings demonstration, maximum shear is 1.72 MPa.
Above-described embodiment is only preferred embodiment of the present invention, is not used for limiting practical range of the present invention.Be that all equalizations of doing according to content of the present invention change and modify, all by the claims in the present invention scope required for protection is contained.
Claims (9)
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 is placed in loaded seat, and pre-press is built-in with right cylinder test specimen; Pre-press is locked right cylinder test specimen by pressing machine;
Right cylinder test specimen comprises the first structural sheet, the second structural sheet and the 3rd structural sheet, between the first structural sheet and the second structural sheet, is connected by the first tack coat, between the second structural sheet and the 3rd structural sheet, is connected by the second tack coat;
Shearing component comprises to be sheared pressure head and shears base; Shear base be loaded in loaded seat, and shear base center be provided with dead slot, dead slot symmetria bilateralis is provided with contact site, 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 same straight line; The surface of contact length of shearing pressure head and right cylinder test specimen is 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 is 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, is characterized in that: described shearing pressure head contacts with 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, is characterized in that: described pre-press also comprises base plate, top board and guide rod; Described base plate is placed in the bottom of right cylinder test specimen, and described top board is placed in the top of right cylinder test specimen; Described guide rod one end is installed on top board by clamping screw, and the other end is placed on base plate; Described pressing machine lock onto right cylinder test specimen in pre-press by clamping screw.
4. bituminous pavement right cylinder test specimen interlayer shear device according to claim 3, is characterized in that: the quantity of described guide rod is 4, and 4 guide rods are in turn connected into square.
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 to adopt the on-the-spot road surface core of getting core.
7. bituminous pavement right cylinder test specimen interlayer shear device according to claim 1, 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. the bituminous pavement right cylinder test specimen interlayer shear device of utilization as described in claim 1-7 any one carries out a method for interlayer shear to test specimen, it is characterized in that comprising the following steps:
1) pre-press is installed: pre-press comprises base plate, top board, guide rod and clamping screw; Base plate is placed in the bottom of right cylinder test specimen, and top board is placed in the top of right cylinder test specimen, and described guide rod one end is installed on top board by clamping screw, and the other end is placed on base plate;
2) precompressed, locking right cylinder test specimen: the pre-press that right cylinder test specimen is housed is placed in the loaded seat of pressing machine vertically, exerts pressure to right cylinder test specimen by top board; Then, tighten gradually clamping screw, until the pressure gauge reading back to zero of pressing machine, thereby guarantee that pressing machine lock onto right cylinder test specimen in pre-press by clamping screw;
3) install and shear: will shear floor installation in the loaded seat of pressing machine; By step 2) in the right cylinder test specimen of locking be disposed across and shear on base; Shearing component comprises to be sheared pressure head and shears base; Shear base be loaded in loaded seat, and shear base center be provided with dead slot, the relative symmetria bilateralis of dead slot is provided with contact site, contact site contacts with the first structural sheet, the 3rd structural sheet respectively; By the right cylinder test specimen traverse after locking and be loaded on and shear on base, shear pressure head and be installed on right cylinder test specimen, and shear pressure head, the second structural sheet, the center line of shearing base and dead slot is on same straight line; The surface of contact length of shearing pressure head and right cylinder test specimen is 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 is 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; By shearing pressure head, right cylinder test specimen is loaded, thereby carry out shear test.
9. bituminous pavement right cylinder test specimen interlayer shear method according to claim 8, it is characterized in that: step 2) in, for reducing the deformation of creep and the stress relaxation that produce after the precompressed of right cylinder test specimen, described right cylinder test specimen is from locking onto the time that starts 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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| CN102830021B true CN102830021B (en) | 2014-06-11 |
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| 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 |
| CN104215365B (en) * | 2014-09-03 | 2017-01-25 | 哈尔滨工业大学 | Pavement structure layer internal shearing stress testing sensor and embedding technology and application thereof |
| 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 |
| 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 |
| 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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| WO1996025653A1 (en) * | 1995-02-17 | 1996-08-22 | Trautwein Stephen J | Methods and apparatus for measuring double-interface shear in geosynthetics and geomaterials |
| CN2447769Y (en) * | 2000-10-10 | 2001-09-12 | 上海申雅密封件有限公司 | Connecting adapter for material testing machine |
| CN101788431A (en) * | 2010-02-10 | 2010-07-28 | 长沙理工大学 | Device and method for testing shear performance of asphalt mixture |
| CN202748276U (en) * | 2012-08-24 | 2013-02-20 | 华南理工大学 | Shearing device for asphalt pavement cylinder test specimen layer |
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