CN103926157A - Auxiliary measuring device of interlayer shear strength of asphalt mixture - Google Patents
Auxiliary measuring device of interlayer shear strength of asphalt mixture Download PDFInfo
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- CN103926157A CN103926157A CN201410181079.2A CN201410181079A CN103926157A CN 103926157 A CN103926157 A CN 103926157A CN 201410181079 A CN201410181079 A CN 201410181079A CN 103926157 A CN103926157 A CN 103926157A
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Abstract
The invention relates to the field of interlayer measuring devices of asphalt mixtures, and specifically discloses an auxiliary measuring device of interlayer shear strength of an asphalt mixture. The auxiliary measuring device comprises a Marshall test specimen mould (8) and a normal force applying mechanism, wherein the normal force applying mechanism comprises a bottom plate (1), a jack (6), a spring (9), a pull pressure sensor (5), a secondary display instrument (12) and a spring supporting device; the Marshall test piece mold (8) and the jack (6) are installed on the bottom plate (1); the spring (9) is connected with the spring supporting device and the Marshall test piece mold (8), and the pull pressure sensor (5) is connected with the jack (6) and the spring supporting device, and is further connected with the secondary display instrument (12). The auxiliary measuring device can be used for measuring interlayer shear strength under the comprehensive action of a normal force and a tangential force, and has the advantages of simple and compact structure, convenience for use, low cost and the like.
Description
Technical field
The present invention relates to asphalt interlayer measurement mechanism field, be specifically related to a kind of asphalt inter-layer shearing strength aided measurement device.
Background technology
Inter-layer shearing strength is an important indicator evaluating asphalt interlayer contact state, is also an important evaluation index of Service Performance of Asphalt Pavement.
At present, the equipment of interface layer shearing strength only can carry out to compound test specimen the direct shear strength mensuration of tangential force effect, and in actual conditions, asphalt layer also can be subject to the effect of normal force, and current checkout equipment cannot complete the determination of shear strength based on normal force combined action to compound test specimen.Asphalt inter-layer shearing strength based on normal force is stressed more consistent with bituminous pavement interlayer, more can accurately reflect actual loading characteristic between supercrust, and current sensing equipment is unfavorable for the interlayer characteristic of deep study and analysis asphaltic road-mix surface course.Along with pavement construction and maintenance arrive on a large scale, in-place regeneration, road surface overlays certainly will bring new interlayer contact problem, and bituminous pavement interlayer is also more and more subject to people in conjunction with problem and pays close attention to.Therefore be necessary to develop a set of asphalt inter-layer shearing strength device based on normal force combined action, for the interlayer characteristic of deep study and analysis asphaltic road-mix surface course.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of asphalt inter-layer shearing strength aided measurement device, and this device can apply at the trial normal force and carry out shear strength test.
The present invention addresses the above problem adopted technical scheme:
Asphalt inter-layer shearing strength aided measurement device, comprise marshal piece mould, also comprise normal force force application mechanism, described normal force force application mechanism comprises base plate, lifting jack, spring, tension-compression sensor, baffle plate, secondary Displaying Meter, spring supporting device; Described marshal piece mould, baffle plate, lifting jack are arranged on base plate; Described spring is connected between spring supporting device and marshal piece mould, described tension-compression sensor is connected between lifting jack and spring supporting device, one end that lifting jack does not connect tension-compression sensor is connected on baffle plate, and described tension-compression sensor is also connected with secondary Displaying Meter.In prior art, in the test of asphalt inter-layer shearing strength, substantially do not consider the effect of normal force, and inventor finds in long-term research and test, bituminous pavement is not only subject to the effect of tangential force, its normal force effect is also very important, Given this, inventor has proposed the aided measurement device in this programme, this device adopts lifting jack and spring to coordinate, can impose normal force to the test specimen in marshal piece mould, this acting force can be pulling force or pressure, carries out shear test with abundant simulated roadway force-bearing situation.
As a further improvement on the present invention, above-mentioned spring supporting device comprises locating shaft, support bar, crossbeam, described locating shaft quantity is 2, every locating shaft is fixed on base plate by two support bars, described crossbeam two ends are connected on two locating shafts and can on locating shaft, horizontally slip, described marshal piece mould, baffle plate, lifting jack, tension-compression sensor, crossbeam right-to-left or arrange successively from left to right, described spring is connected on crossbeam.Spring supporting device adopts above-mentioned setting to provide pulling force for marshal piece mould, when the lifting jack application of force, promote crossbeam to moving away from the direction of marshal piece mould, thereby spring is produced to pulling force, further the test specimen in marshal piece mould is produced to pulling force.In this programme, inventor has considered the simulation that normal tension is provided first, according to normal custom, the consideration of road pavement pressure, those of ordinary skill is generally only expected pressure, and in shear strength test, its habituation is not considered, and conventionally ignored because road surface deforms, the pulling force bringing to the mix asphalt bed of material that the reasons such as material layer is thinner cause, and inventor finds that this is also the problem of can not ignore in long-term observation and research, thereby propose can apply in this programme the aided measurement device of normal tension, situation with abundant simulated roadway is carried out shear test.
Further, above-mentioned number of springs is 2, and two springs be arranged in parallel, and two springs are connected with both sides before and after marshal piece mould respectively, adopt 2 springs to apply pulling force to marshal piece mould in this programme, and the application of force is balance more, and test effect more.
Further, the structure that above-mentioned baffle plate is high in the middle of being, both sides are low, not affect the stretching of spring.
Further, on above-mentioned baffle plate, be provided with two through holes that pass for spring, not affect the stretching of spring.
Further, above-mentioned crossbeam two ends are set in respectively on two locating shafts, and the slip of crossbeam on locating shaft is more prone to, resistance is less.
Further, above-mentioned tension-compression sensor is bolted on crossbeam and lifting jack mould, and spring is connected on crossbeam and marshal piece mould by pin.
As another improvement of the present invention, above-mentioned spring supporting device is back up pad, described marshal piece mould, spring, back up pad, tension-compression sensor, lifting jack, baffle plate right-to-left or arrange successively from left to right.In this programme, the said structure of spring supporting device can provide pressure for marshal piece mould, when the lifting jack application of force, promote back up pad and move to the direction of marshal piece mould, thereby extrusion spring applies normal pressure to marshal piece mould.
Further, between above-mentioned spring and marshal piece mould, be also provided with circular top plate, described back up pad is circular slab, circular top plate contacts with the test specimen on marshal piece mould, the pressure of spring transmission is carried on test specimen by this circular top plate, stressed more even, more approach true stressing conditions.
Further, above-mentioned asphalt inter-layer shearing strength aided measurement device also comprises the second normal force force application mechanism; This second normal force force application mechanism comprises the second two Displaying Meters that are arranged on marshal piece mould right side and the second circular top plate, the second spring, the second back up pad, the second tension-compression sensor, the second lifting jack, the second baffle arranged successively from left to right and are connected with the second tension-compression sensor; Described the second circular top plate is connected with marshal piece mould; Described the second spring left end connects the second circular top plate, right-hand member is connected with the second back up pad; Described the second tension-compression sensor two ends are connected with the second lifting jack with the second back up pad respectively by bolt; The baffle plate of described normal force force application mechanism, lifting jack, tension-compression sensor, crossbeam right-to-left are arranged successively, and are positioned at marshal piece mould left side.In this programme, marshal piece mould left side arranges normal force force application mechanism, can apply pulling force to the test specimen in marshal piece mould, right side arranges the second normal force force application mechanism that can exert pressure, two normal force force application mechanisms can both be dismantled and be connected on base plate, can apply pulling force to test specimen, can exert pressure again, can fully imitate the actual loading situation that asphalt layer does road surface and carry out shear test, two cover normal force force application mechanisms can switch easily, easy to use, simple to operate.
To sum up, the invention has the beneficial effects as follows:
1, the present invention can impose normal force to the test specimen in marshal piece mould, this acting force can be pulling force or pressure, carry out shear test with abundant simulated roadway force-bearing situation, by lifting jack controlled pressure meter reading, can realize for bitumen mixture specimen based on normal direction draw, the direct shear strength of pressure measures;
2, counterweight of the present invention is arranged on the outside of combination unit, and convenient loading avoided because load, device being produced and perturbing and then measurement result is impacted;
3, data collector simple installation of the present invention, is easy to reading out data;
4, the present invention is simple and compact for structure, with low cost;
5, when the present invention adopts two normal force force application mechanisms, can apply pulling force to test specimen, can exert pressure again, can fully imitate the actual loading situation that asphalt layer does road surface and carry out shear test, two cover normal force force application mechanisms can switch easily, easy to use, simple to operate.
Brief description of the drawings
Fig. 1 is the vertical view of embodiment 2 Asphalt Mixture inter-layer shearing strength aided measurement devices;
Fig. 2 is the structural representation of marshal piece mould;
Fig. 3 is the structural representation of embodiment 2 Asphalt Mixture inter-layer shearing strength aided measurement devices;
Fig. 4 is the vertical view of embodiment 3 Asphalt Mixture inter-layer shearing strength aided measurement devices;
Fig. 5 is the structural representation of embodiment 3 Asphalt Mixture inter-layer shearing strength aided measurement devices;
Fig. 6 is the structural representation of embodiment 4.
Mark and corresponding parts title in accompanying drawing: 1-base plate, 2-locating shaft, 3-support bar, 4-crossbeam, 5-tension-compression sensor, 6-lifting jack, 8-marshal piece mould, 9-spring, 10-bolt, 11-baffle plate, bis-Displaying Meters of 12-, 13-data line, 14-pin, 15-back up pad, 16-the second lifting jack, 17-the second spring, 18-the second tension-compression sensor, 19-second baffle, 20-the second circular top plate, 21-the second back up pad, 22-circular top plate.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is done to detailed description further, but embodiments of the present invention are not limited to this.
Embodiment 1:
Asphalt inter-layer shearing strength aided measurement device, comprise marshal piece mould 8, normal force force application mechanism, this normal force force application mechanism comprises baffle plate 11, secondary Displaying Meter 12, the spring supporting device of base plate 1, lifting jack 6, spring 9, tension-compression sensor 5, fixing lifting jack 6: marshal piece mould 8, baffle plate 11, lifting jack 6 are arranged on base plate 1; Spring 9 is connected between spring supporting device and marshal piece mould 8; Tension-compression sensor 5 is connected between lifting jack 6 and spring supporting device, and one end that lifting jack 6 does not connect tension-compression sensor 5 is connected on baffle plate 11, and tension-compression sensor 5 is also connected with secondary Displaying Meter 12 by data line 13.Marshal piece mould 8 adopts compound marshal piece mould conventional in prior art, and its concrete structure is referring to Fig. 2, and bitumen mixture specimen is just placed in this marshal piece mould 8 and carries out shearing strength test, and when test, tangential forces applies from top.The power that act as support spring 9 and lifting jack 6 is applied of the spring supporting device in the present embodiment passes to spring 9, it can be the structures such as tabular, shaft-like, the strip that can move left and right, its mounting means can be unsettled, also can have the supporting support that can slide on base plate 1.
Embodiment 2:
As shown in figures 1 and 3, Fig. 1 is the vertical view of asphalt inter-layer shearing strength aided measurement device to asphalt inter-layer shearing strength aided measurement device in the present embodiment, and Fig. 3 is the front elevation of asphalt inter-layer shearing strength aided measurement device.
On the basis of embodiment 1, the spring supporting device of the asphalt inter-layer shearing strength aided measurement device in the present embodiment comprises 3,1 crossbeam 4 of 2,4 support bars of 2 locating shafts: every locating shaft 2 is fixed on base plate 1 by two support bars 3, crossbeam 4 two ends are connected on two locating shafts 2, and can on locating shaft 2, horizontally slip, spring 9 is connected on crossbeam 4, above-mentioned marshal piece mould 8, baffle plate 11, lifting jack 6, tension-compression sensor 5, crossbeam 4 right-to-lefts or arrange successively from left to right.Spring 9 quantity are 2, and two springs 9 be arranged in parallel and index, length are identical, and two springs 9 are connected with marshal piece mould 8 both sides, front and back respectively.
The present embodiment is to realize the asphalt inter-layer shearing strength aided measurement device that applies normal tension, below be arranged as successively all parts of the asphalt inter-layer shearing strength aided measurement device of example explanation the present embodiment with marshal piece mould 8, baffle plate 11, lifting jack 6, tension-compression sensor 5, crossbeam 4 right-to-lefts concrete fit system and normal tension apply principle:
As shown in Figure 1,4 support bars 3 are fixed on base plate 1, it is also base plate 1 top that 2 locating shafts 2 are installed to support bar 3 tops along the length direction of base plate 1 abreast, between support bar 3 and base plate 1 and locating shaft 2, is connected by bolt 10, and the height that 2 locating shafts 2 arrive base plate 1 is identical; Crossbeam 4 two ends are set on locating shaft 2, and can on locating shaft 2, horizontally slip, and 2 pins are installed on crossbeam 4.Marshal piece mould 8 is arranged on crossbeam 4 right sides, be bolted on base 1, marshal piece mould 8 both sides, front and back also respectively correspondence be provided with two pins 14, two springs 9 can be arranged between crossbeam 4 and marshal piece mould 8 abreast.Baffle plate 11 is arranged on marshal piece mould 8 left sides, it is between crossbeam 4 and baffle plate 11 that lifting jack 6 is arranged on baffle plate 11 left sides, lifting jack 6 left ends are connected with tension-compression sensor 5 by bolt 10, right side is fixed by baffle plate 11, tension-compression sensor 5 left ends are fixed on crossbeam 4 centre positions by bolt 10, and tension-compression sensor 5 is connected with secondary Displaying Meter 12 by data line 13.
Above-mentioned baffle plate 11 is for being provided with two through holes that pass for springs 9 on middle high, structure that both sides are low or baffle plate 11, not affect the stretching of spring.In practical application, baffle plate 11 also can adopt other structures.
In the present embodiment, spring 9, crossbeam 4, marshal piece mould 8 are at same level height; Crossbeam 4 can slide on locating shaft 2, in order to eliminate self friction power, test findings affected, and the accuracy of warranty test, crossbeam 4 uses light-high-strength to be difficult for the material that gets rusty as far as possible, such as but not limited to aluminium alloy, titanium alloy, almag; Locating shaft 2, because needs long term exposure is in air, need select the material that is difficult for getting rusty to make, such as but not limited to stainless steel, copper, steel chromium plating; Spring 9 can be processed to the monomer of different stiffness factors, to be suitable for different situations.
Its principle that applies normal tension is as follows:
After test unit assembling, according to test needs, select a suitable normal tension.Use this device, by lifting jack 6, marshal piece mould 8 is applied to selected normal tension, the normal tension that lifting jack 6 applies passes to marshal piece mould 8 by crossbeam 4, spring 9, in the situation that applying normal tension, carry out direct shear test, measure the inter-layer shearing strength of asphalt under normal tension and tangential force combined action, the size of its normal tension can be read according to the secondary Displaying Meter 12 being connected with tension-compression sensor 5.
In addition, in order to ensure the accuracy of image data, need to select suitable tension-compression sensor, in this example, adopting maximum range is the tension-compression sensor of 10KN, in practical application, can select according to specific needs the range of tension-compression sensor 5.
Embodiment 3:
As shown in Figure 4 and Figure 5, on the basis of embodiment 1, the present embodiment medi-spring bracing or strutting arrangement is circular base slab 15, between described spring 9 and marshal piece mould 8, is also provided with circular top plate 22; Described marshal piece mould 8, circular top plate 22, spring 9, back up pad 15, tension-compression sensor 5, lifting jack 6, baffle plate 11 right-to-lefts or arrange successively from left to right, the present embodiment is to realize the asphalt inter-layer shearing strength aided measurement device that applies normal pressure, below the mode of arranging successively from left to right with marshal piece mould 8, circular top plate 22, spring 9, back up pad 15, tension-compression sensor 5, lifting jack 6, baffle plate 11 concrete matching relationship that all parts in this device is described with and apply the principle of normal pressure:
Marshal piece mould 8 is arranged on baffle plate 11 left sides, tension-compression sensor 5 is bolted in back up pad 15, by bolt, tension-compression sensor 5 is connected with lifting jack 6 again, back up pad 15 is connected by spring 9 with circular top plate 22, and circular top plate 22 is contacted with compound test specimen in marshal piece mould 8.Circular top plate 22 sizes are preferably identical with sample dimensions size with size, when installation, ensure that lifting jack 6, circular top plate 22 and back up pad 15 are in identical height.
After test unit assembling, according to test needs, select a suitable normal pressure, by lifting jack 6, marshal piece mould 8 is applied to selected normal pressure, the normal pressure that lifting jack 6 applies passes to test specimen via back up pad 15, spring 9 and circular top plate 22, finally, in the situation that applying normal pressure, carry out direct shear test, measure the inter-layer shearing strength of asphalt under normal pressure and tangential force combined action.Its normal pressure applying can be read by the secondary Displaying Meter 12 being connected with tension-compression sensor 5.
Embodiment 4:
As shown in Figure 6, on the basis of embodiment 2, asphalt inter-layer shearing strength aided measurement device in the present embodiment comprises two cover normal force force application mechanisms, first set normal force force application mechanism is the normal force force application mechanism in embodiment 2, its baffle plate 11, lifting jack 6, tension-compression sensor 5, crossbeam 4 right-to-lefts are arranged successively, and are positioned at marshal piece mould 8 left sides.
And the second normal force force application mechanism comprises the second two Displaying Meters that are arranged on marshal piece mould 8 right sides and the second circular top plate 20, the second spring 17, the second back up pad 21, the second tension-compression sensor 18, the second lifting jack 16, the second baffle 19 arranged successively from left to right and are connected with the second tension-compression sensor 18; Described the second circular top plate 20 is connected with marshal piece mould 8; Described the second spring 17 left ends connect the second circular top plate 20, right-hand member is connected with the second back up pad 21; Described the second tension-compression sensor 18 two ends are connected with the second lifting jack 16 with the second back up pad 21 respectively by bolt.
In the present embodiment, two cover normal force force application mechanisms are set, both can apply normal tension, also can apply normal pressure, the conversion of two cover normal force force application mechanisms is also very convenient, the simple normal direction force application mechanism of exerting pressure of removing in the time need to applying pulling force, vice versa, can not only measure the inter-layer shearing strength of asphalt under normal force and tangential force combined action, and can select as required to apply normal tension or pressure, and switch easy to use.
Below be only the preferred embodiment of the present invention, protection scope of the present invention is also not only confined to above-described embodiment, and all technical schemes belonging under thinking of the present invention all belong to protection scope of the present invention.It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, should be considered as protection scope of the present invention.
Claims (10)
1. asphalt inter-layer shearing strength aided measurement device, comprise marshal piece mould (8), it is characterized in that, also comprise normal force force application mechanism, described normal force force application mechanism comprises base plate (1), lifting jack (6), spring (9), tension-compression sensor (5), baffle plate (11), secondary Displaying Meter (12), spring supporting device; Described marshal piece mould (8), lifting jack (6), baffle plate (11) are arranged on base plate (1); Described spring (9) is connected between spring supporting device and marshal piece mould (8), described tension-compression sensor (5) is connected between lifting jack (6) and spring supporting device, one end that lifting jack (6) does not connect tension-compression sensor (5) is connected to baffle plate (11) above, and described tension-compression sensor (5) is also connected with secondary Displaying Meter (12).
2. asphalt inter-layer shearing strength aided measurement device according to claim 1, it is characterized in that, described spring supporting device comprises locating shaft (2), support bar (3), crossbeam (4), described locating shaft (2) quantity is 2, every locating shaft (2) is fixed on base plate (1) by two support bars (3), described crossbeam (4) two ends are connected to two locating shafts (2) above and can on locating shaft (2), horizontally slip, described marshal piece mould (8), baffle plate (11), lifting jack (6), tension-compression sensor (5), crossbeam (4) right-to-left or from left to right successively arrange, described spring (9) is connected on crossbeam (4).
3. asphalt inter-layer shearing strength aided measurement device according to claim 2, it is characterized in that, described spring (9) quantity is 2, and two springs (9) be arranged in parallel, and two springs (9) are connected with both sides before and after marshal piece mould (8) respectively.
4. asphalt inter-layer shearing strength aided measurement device according to claim 2, is characterized in that, described baffle plate (11) is the structure that centre is high, both sides are low.
5. asphalt inter-layer shearing strength aided measurement device according to claim 2, is characterized in that, is provided with two through holes that pass for spring (9) on described baffle plate (11).
6. asphalt inter-layer shearing strength aided measurement device according to claim 2, is characterized in that, described crossbeam (4) two ends are set in respectively on two locating shafts (2).
7. according to the arbitrary described asphalt inter-layer shearing strength aided measurement device of claim 2 to 6, it is characterized in that, described tension-compression sensor (5) is fixed on crossbeam (4) by bolt (10) and lifting jack (6) is upper, and spring (9) is connected on crossbeam (4) and marshal piece mould (8) by pin (14).
8. asphalt inter-layer shearing strength aided measurement device according to claim 1, it is characterized in that, described spring supporting device is back up pad (15), described marshal piece mould (8), spring (9), back up pad (15), tension-compression sensor (5), lifting jack (6), baffle plate (11) right-to-left or arrange successively from left to right.
9. asphalt inter-layer shearing strength aided measurement device according to claim 8, is characterized in that, between described spring (9) and marshal piece mould (8), is also provided with circular top plate (22), and described back up pad (15) is circular slab.
10. according to the arbitrary described asphalt inter-layer shearing strength aided measurement device of claim 1 to 6, it is characterized in that, also comprise the second normal force force application mechanism;
Described the second normal force force application mechanism comprises the second two Displaying Meters that are arranged on marshal piece mould (8) right side and the second circular top plate (20), the second spring (17), the second back up pad (21), the second tension-compression sensor (18), the second lifting jack (16), the second baffle (19) arranged successively from left to right and are connected with the second tension-compression sensor (18); Described the second circular top plate (20) is connected with marshal piece mould (8); Described the second spring (17) left end connects the second circular top plate (20), right-hand member is connected with the second back up pad (21); Described the second tension-compression sensor (18) two ends are connected with the second lifting jack (16) with the second back up pad (21) respectively by bolt;
The baffle plate (11) of described normal force force application mechanism, lifting jack (6), tension-compression sensor (5), crossbeam (4) right-to-left are arranged successively, and are positioned at marshal piece mould (8) left side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410181079.2A CN103926157B (en) | 2014-04-30 | 2014-04-30 | Asphalt inter-layer shearing strength aided measurement device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410181079.2A CN103926157B (en) | 2014-04-30 | 2014-04-30 | Asphalt inter-layer shearing strength aided measurement device |
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| CN103926157A true CN103926157A (en) | 2014-07-16 |
| CN103926157B CN103926157B (en) | 2016-06-15 |
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| CN201410181079.2A Expired - Fee Related CN103926157B (en) | 2014-04-30 | 2014-04-30 | Asphalt inter-layer shearing strength aided measurement device |
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| CN105424504A (en) * | 2015-11-04 | 2016-03-23 | 长沙理工大学 | Asphalt mixture torsion shear test device capable of applying normal stress |
| CN107655826A (en) * | 2017-09-06 | 2018-02-02 | 河海大学 | A kind of device and its measuring method for measuring steel and concrete interface shearing |
| CN109142155A (en) * | 2018-06-28 | 2019-01-04 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Road interface characteristic test device and method |
| CN111141624A (en) * | 2020-02-25 | 2020-05-12 | 中南大学 | Test device and method for measuring interlayer shearing performance of pavement |
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| CN111141624A (en) * | 2020-02-25 | 2020-05-12 | 中南大学 | Test device and method for measuring interlayer shearing performance of pavement |
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| Publication number | Publication date |
|---|---|
| CN103926157B (en) | 2016-06-15 |
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