CN108801908B - On-site testing device and testing method for pavement interlayer bonding strength - Google Patents
On-site testing device and testing method for pavement interlayer bonding strength Download PDFInfo
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- CN108801908B CN108801908B CN201810623437.9A CN201810623437A CN108801908B CN 108801908 B CN108801908 B CN 108801908B CN 201810623437 A CN201810623437 A CN 201810623437A CN 108801908 B CN108801908 B CN 108801908B
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Abstract
The invention discloses a field test device for bonding strength between pavement layers, which comprises: a base; the fixing device comprises a first fixing device and a second fixing device which are fixedly arranged on the base, and the first fixing device and the second fixing device can clamp or release the structural layer to be detected; and the rotating device is fixedly arranged on the base through a support and is connected with the second fixing device and used for driving the second fixing device to rotate. The method for testing the bonding strength between the road surface layers on site can test the bonding strength between different structural layers of a road surface structure on site, easily solves the problem of large test error caused by unreasonable loading mode, and has relatively small damage area to the original road surface and simpler test method.
Description
Technical Field
The invention relates to the technical field of highway engineering detection, in particular to a field testing device and a field testing method for pavement interlayer bonding strength.
Background
In the construction of expressway in China, asphalt pavement is generally adopted. In order to ensure that the multi-layer assembly system of the asphalt pavement of the expressway has good integrity, ensure the coordination of stress and strain change when the pavement is under the action of vehicle load, prevent rainwater from permeating into the interior of a pavement structure, improve the water damage resistance, and lead more and more bonding conditions among asphalt pavement layers to cause wide attention of engineering builders. The multilayer pavement is generally paved in layers, binding materials are spread among the layers to improve the bonding performance among the layers, the binding materials among the layers are often disabled due to construction pollution, material property difference and the like, and the pavement layers become weak links of a pavement structure. When a large driving load (particularly a horizontal load) is applied, a large shearing stress is generated between layers, when the force exceeds the shearing strength of an interlayer bonding material, a surface layer can be displaced on a joint surface, the pavement can be damaged in a form of damage caused by insufficient interlayer bonding strength due to the fact that the pavement is subjected to hugging, pushing, dropping, peeling and the like in severe cases, the pavement is damaged in an aggravated manner due to the entrance of moisture, and the service performance and durability of the pavement are seriously influenced.
Therefore, if the bonding strength between the road surface layers can be accurately tested, the method can be beneficial to distinguishing the advantages and disadvantages of bonding materials between the layers, selecting proper bonding materials for paving the asphalt road surface or the bridge deck, evaluating the bonding condition between the conventional road surface layers and the like.
At present, a commonly used instrument for testing the shearing force of an asphalt pavement or a bridge deck interlayer bonding material belongs to a direct shear type tester, an asphalt mixture test piece is firstly fixed on a clamp in the test, as shown in figure 1, and then a force parallel to the plane of a bonding layer is applied on another loading test piece until the two test pieces slide relatively, so that the shearing strength of the bonding layer can be tested; in addition, there is a relatively rare rotary tester (the testing method mentioned in patent CN 101275903 a), as shown in fig. 2, during the test, a test piece of asphalt mixture is fixed on a fixture, then a head of the fixture is bonded to the other end of the asphalt mixture, and the fixture head is rotated until the two test pieces slide relatively, so as to measure the shear strength of the bonding layer. During the test, the shearing force of the instrument for testing the interlayer bonding material indoors and outdoors is found to be obviously insufficient: (1) the loading mode of the direct shear type instrument generates larger bending moment at the bonding layer part and generates tensile stress vertical to an interlayer interface, so that the interlayer damage is not completely caused by the shearing force, and a part of tensile stress is torn, thereby bringing larger error to the test result; (2) when a direct shear type instrument is used for field test, in order to apply shear stress to the lateral side of a test piece, the pavement must be damaged to a greater extent so that the shearing equipment can be seen and put down sufficiently, and therefore the damage to the pavement in the test process is greater; (3) when the clamp rotating type instrument is tested, the clamp and the road surface are bonded together by using specific glue, the bonding strength forming time is long, generally 3-4 h, and the clamp and the road surface are easily damaged, so that the test fails; (4) when the two types of instruments are tested on site, as can be seen from the attached drawings 1 and 2, the direct shear type instrument can only measure the bonding strength of the lowermost layer of the structural layer, and when the bonding strength between different layers needs to be tested on site, the damage to the original pavement is large; due to the difference of the bonding between different structural layers, the clamp rotating type instrument only can be used for testing the layer with the worst bonding between the layers, namely, only the minimum bonding between the layers can be tested, the bonding strength between different layers cannot be tested, and the bonding strength between the layers at a required position cannot be tested.
In view of the above-mentioned drawbacks of the conventional bonding layer strength testing device, the present inventors have conducted extensive practical experience and professional knowledge for many years in designing and manufacturing such products, and have conducted research and innovation in cooperation with the application of theory, in order to create a field testing device and testing method for bonding strength between pavement layers, so that the field testing device and testing method are more practical. After continuous research and design and repeated trial production and improvement, the invention with practical value is finally created.
Disclosure of Invention
The invention aims to overcome the defects of the conventional bonding layer strength detection device and provide a field testing device and a testing method for the bonding strength between pavement layers, so that the field testing device and the testing method are more practical and have industrial utilization value.
The purpose of the invention and the technical problem to be solved are realized by adopting the following technical scheme.
An on-site testing device for bonding strength between pavement layers comprises:
a base;
the fixing device comprises a first fixing device and a second fixing device which are fixedly arranged on the base, and the first fixing device and the second fixing device can clamp or release the structural layer to be detected;
and the rotating device is fixedly arranged on the base through a support and is connected with the second fixing device and used for driving the second fixing device to rotate.
As a preferred technical scheme, the base is a cylindrical base with a hollow inner part, and the base is fixed on a road surface to be detected through bolts.
As a preferred technical solution, the first fixing device and the second fixing device are pneumatic clamping jaw devices, and the pneumatic clamping jaw devices include:
a cylinder;
the clamping jaws are arranged at the end parts of the piston rods of the cylinders, and each group of the pneumatic clamping jaw devices comprises two groups of symmetrically arranged clamping jaws.
As a preferred technical scheme, the rotating device is a pneumatic turntable, and the pneumatic turntable and the second fixing device are fixed through bolts.
As a preferred technical scheme, the support is a telescopic support.
As a preferable technical scheme, the clamping surfaces of the clamping jaws are provided with anti-skidding layers.
The field test method for the interlayer bonding strength of the pavement adopts the field test device for the interlayer bonding strength of the pavement, and comprises the following steps:
step 1, drilling a cylindrical core sample on an asphalt concrete layer by using a core drilling machine, and cleaning impurities on the periphery of the core sample;
and 3, starting the rotating device to drive the second fixing device to rotate so as to perform a torsion shear test, and acquiring the torsion force required by rotating the second fixing device to obtain the interlayer bonding strength of the measured structure.
As a preferable technical solution, in the step 1, a core drilling machine is used to drill a cylindrical core sample into the asphalt concrete layer, and the concrete on the periphery of the core sample is taken out, and the area of the concrete on the periphery of the core sample taken out is not less than the area of the base.
As a preferable technical solution, in the step 2, the rotational loading speed of the rotating device is 0.1 to 10N/s.
As a preferred technical solution, the torsional force is collected every 0.5 s.
By adopting the technical scheme, the following technical effects can be realized:
1) the method for testing the bonding strength between the road surface layers on site can test the bonding strength between different structural layers of a road surface structure on site, easily solves the problem of large test error caused by unreasonable loading mode, has relatively small damage area to the original road surface and is simpler in test method;
2) in addition, the method for testing the interlayer bonding strength of the pavement has accurate and reliable field test data and is convenient to carry; the method can drill the core on site once, test the interlayer bonding strength of different contact interfaces, accurately evaluate the bonding condition between the pavements of the active asphalt pavement or the bridge deck, and further guide the selection of a proper interlayer bonding material.
Drawings
FIG. 1 is a schematic diagram of a prior art application of horizontal force to measure the shear strength of a bond line;
FIG. 2 is a schematic diagram of a prior art method for measuring the shear strength of a bond layer by applying a horizontal rotational force;
FIG. 3 is a schematic structural diagram of the on-site testing device for the bonding strength between the pavement layers according to the present invention;
wherein: 1-base, 2-first fixing device, 3-second fixing device, 31-air cylinder, 32-clamping jaw, 33-piston rod, 4-rotating device and 5-core sample.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description will be given of the specific embodiments, features and effects of the on-site testing device for interlayer adhesion strength of pavement according to the present invention.
As shown in fig. 3, the present invention discloses a field test device for pavement interlayer bonding strength, comprising:
the core sample detection device comprises a base 1 and a cylindrical base 1, wherein a cavity is formed in the base 1, the base 1 is directly sleeved on a core sample 5 to be detected in a test process, the base 1 serves as the integral foundation of the device and can serve as a leveling base layer firstly, and the phenomenon that the bottom of the core sample is uneven when the core sample is taken is prevented, so that a rotating device 4 applies non-horizontal force to the core sample 5 to be detected, and a detection result generates large errors;
the fixing device comprises a first fixing device 2 and a second fixing device 3 which are fixedly arranged on the base 1, the first fixing device 2 and the second fixing device 3 can clamp or release the structural layer to be detected, specifically, the first fixing device 2 is used for fixing the lower structural layer, and the second fixing device 3 is used for clamping and providing rotary power for the upper structural layer, so that a torsion test is realized;
and the rotating device 4 is fixedly arranged on the base 1 through a support, the rotating device 4 is connected with the second fixing device 3 and used for driving the second fixing device 3 to rotate, and the support is a bearing support of the second fixing device 3.
As a preferred technical scheme, base 1 is the cylindrical base 1 of hollow inside, and base 1 passes through the bolt fastening and waits to detect the road surface.
As a preferred solution, the first fixing device 2 and the second fixing device 3 are pneumatic clamping jaw devices, which comprise:
a cylinder 31;
the clamping jaw 32 sets up the tip at the piston rod 33 of cylinder 31, and every pneumatic clamping jaw device of group includes the clamping jaw 32 that two sets of symmetries set up, and the stability that pneumatic clamping jaw device got can effectively be increased in the setting of two sets of clamping jaws 32.
As a preferred technical solution, the rotating device 4 is a pneumatic turntable, and the pneumatic turntable and the second fixing device 3 are fixed by bolts.
As a preferred technical scheme, the support is telescopic bracket, and telescopic bracket can realize the altitude mixture control of first fixing device 2 and second fixing device 3 to satisfy the detection of the adhesive force of different structural layers.
As a preferable technical solution, the clamping surface of the clamping jaw 32 is provided with an anti-slip layer, specifically, the anti-slip layer is a frosted layer, and the contact between the clamping surface of the clamping jaw 32 and the core sample 5 is increased through the frosted surface.
The invention also discloses a field test method of the bonding strength between the road surface layers, which adopts the field test device of the bonding strength between the road surface layers and comprises the following steps:
step 1, drilling a cylindrical core sample 5 on an asphalt concrete layer by using a core drilling machine, cleaning impurities around the core sample 5, and specifically, cleaning the impurities around the core sample 5 by using an electric hair drier;
and 3, starting the rotating device 4 to drive the second fixing device 3 to rotate, so as to perform a torsion shear test, and acquiring the torsion force required by rotating the second fixing device 3 to obtain the interlayer bonding strength of the measured structure.
As a preferable technical solution, in step 1, a core drilling machine is used to drill the asphalt concrete layer into the cylindrical core sample 5, and the concrete around the core sample 5 is taken out, and the area of the concrete around the core sample 5 taken out is not less than the area of the base 1.
As a preferable technical scheme, in the step 2, the rotation loading speed of the rotating device 4 is 0.1-10N/s, and the adaptability adjustment can be carried out according to the structural strength of the core sample to be detected.
As a preferred solution, the torsional force is collected every 0.5 s.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. The utility model provides a road surface interlayer bonding strength field test device which characterized in that includes: the device comprises a base (1), wherein the base (1) is a cylindrical base (1) with a hollow inner part; the fixing device comprises a first fixing device (2) and a second fixing device (3) which are fixedly arranged on the base (1), and the first fixing device (2) and the second fixing device (3) can clamp or release the structural layer to be detected; the rotating device (4) is fixedly arranged on the base (1) through a support, and the rotating device (4) is connected with the second fixing device (3) and used for driving the second fixing device (3) to rotate; the first fixing device (2) and the second fixing device (3) are pneumatic clamping jaw devices, and the pneumatic clamping jaw devices comprise: a cylinder (31); the clamping jaws (32) are arranged at the end part of a piston rod (33) of the cylinder (31), and each group of pneumatic clamping jaw devices comprises two groups of symmetrically arranged clamping jaws (32);
the field test device for the bonding strength between the pavement layers adopts the following test method, and comprises the following steps:
the method comprises the following steps of 1, drilling a cylindrical core sample (5) in an asphalt concrete layer by using a core drilling machine, and cleaning impurities around the core sample (5);
step 2, placing the on-site testing device for the bonding strength between the pavement layers on the periphery of the core sample (5), adjusting the height of the fixing device, and fixing the lower structural layer by adopting the first fixing device (2) and fixing the upper structural layer by adopting the second fixing device (3);
step 3, starting the rotating device (4) to drive the second fixing device (3) to rotate, so as to perform a torsion shear test, and acquiring the torsion force required by rotating the second fixing device (3) to obtain the interlayer bonding strength of the measured structure;
in the step 1, a core drilling machine is adopted to drill a cylindrical core sample (5) on the asphalt concrete layer, concrete on the periphery of the core sample (5) is taken out, and the area of the concrete on the periphery of the core sample (5) which is taken out is not smaller than that of the base (1).
2. The on-site testing device for the bonding strength between the pavement layers as claimed in claim 1, wherein the base (1) is fixed on the pavement to be tested by bolts.
3. The on-site testing device for the bonding strength between the pavement layers as claimed in claim 1, wherein the rotating device (4) is a pneumatic turntable, and the pneumatic turntable is fixed with the second fixing device (3) through bolts.
4. The field testing device for the bonding strength between the pavement layers as recited in claim 1, wherein said stand is a retractable stand.
5. The on-site testing device for the bonding strength between the pavement layers as claimed in claim 1, wherein the gripping surfaces of the gripping jaws (32) are provided with an anti-slip layer.
6. The on-site pavement interlayer bonding strength testing device according to claim 1, wherein in the step 2, the rotating and loading speed of the rotating device (4) is 0.1-10N/s.
7. The field test device for testing interlayer bonding strength of a pavement according to claim 6, wherein the torsional force is collected every 0.5 s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810623437.9A CN108801908B (en) | 2018-06-15 | 2018-06-15 | On-site testing device and testing method for pavement interlayer bonding strength |
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| CN201810623437.9A CN108801908B (en) | 2018-06-15 | 2018-06-15 | On-site testing device and testing method for pavement interlayer bonding strength |
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| CN108801908A CN108801908A (en) | 2018-11-13 |
| CN108801908B true CN108801908B (en) | 2021-05-14 |
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| CN2589966Y (en) * | 2002-12-28 | 2003-12-03 | 达式宇 | Multifunction portable architectural materials tester |
| US7041384B2 (en) * | 2004-03-10 | 2006-05-09 | Honeywell International, Inc. | High bond strength interlayer for rhenium hot gas erosion protective coatings |
| CN101464249B (en) * | 2009-01-09 | 2011-04-27 | 长安大学 | Interlayer tensile strength detecting instrument for asphalt pavement |
| CN102608025B (en) * | 2012-03-06 | 2014-07-16 | 长安大学 | Pavement interlayer bonding strength detector |
| CN102692352A (en) * | 2012-06-25 | 2012-09-26 | 长安大学 | Bridge deck bonding layer torsional shearing device and detection method thereof |
| CN204116208U (en) * | 2014-10-21 | 2015-01-21 | 长安大学 | A kind of pavement structure interlayer cohesive strength pick-up unit |
| CN105181441B (en) * | 2015-10-12 | 2017-12-01 | 济南时代试金试验机有限公司 | A kind of material tensile sample centralising device |
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