CN104777095A - Equipment and method for testing bonding fatigue performance of pavement crack filling material - Google Patents

Abstract

A device and method for testing the bond fatigue performance of pavement grouting materials. The test equipment for the bond fatigue test includes a test device, a vibrating platform and a base, wherein the vibrating platform and the base are connected by four springs. Two motors are installed on the bottom surface of the vibrating platform, and the motors mesh with two eccentric shafts through gears, and the two eccentric shafts are respectively arranged in the horizontal and vertical directions. The bottom surface of the base is provided with a rubber layer to prevent the whole device from vibrating and sliding during operation. One of the two test pieces is fixed on the vibrating platform, and the other is fixed on the test end equipped with universal wheels at the bottom, which can move freely. Vibration is generated in the direction and horizontal direction, and the cumulative vibration time, vibration level and interface damage level of the bonded interface damage are used to comprehensively and quantitatively evaluate the bond fatigue performance of the pavement joint filling material. The invention is used for testing the bonding fatigue performance of pavement joint filling materials.

Description

A kind of equipment and method for testing the bonding fatigue performance of pavement filling material

Technical field:

The invention relates to a test device, in particular to a device and a method for testing the bonding fatigue performance of pavement joint filling materials.

Background technique

Cracks are one of the main diseases of asphalt pavement. The existence of cracks makes water on the road surface or other impurities enter the road base through the cracks, greatly reducing the overall strength and stability of the road, and causing more serious damage to the road. In the northern part of my country, the temperature changes rapidly, the temperature difference between day and night is large and the weather is cold, so the problem of cracks in asphalt pavement is particularly prominent.

At present, the treatment methods for cracks at home and abroad are usually to repair the cracks with filling materials. Initially, hot base asphalt is used to fill the joints. However, because the performance of the base asphalt does not meet the requirements for use, other problems appear soon after the joints are filled. SBS modified asphalt joint filling material has been widely used in asphalt pavement crack repair due to its excellent performance, but SBS modified asphalt is a non-polar material, the bond strength between it and the old pavement is low, and the low temperature of the pavement When shrinking, it is easy for the joint filling material to peel off from the old pavement and regenerate cracks. Nowadays, the joint filling materials on the market are changing with each passing day, and the performance is also uneven, but there is no simple and effective method to evaluate the performance of joint filling materials.

The joint filling material is not only directly exposed to the external environment, but also bonds two disconnected road surfaces together under the action of the wheel load, so how to test and evaluate the use of the joint filling material under the action of repeated load and deformation Performance improvement is the key to evaluate the performance of joint filling materials. However, among the existing technologies and equipment, it has been reported that there is no equipment used to test the performance of joint filling materials, but none can complete the test process under the above conditions, so it is said that there is still a lack of such equipment at present.

What method to use to simulate repeated wheel loads and repeated relative displacements between two pavement slabs has become a major difficulty and focus in testing the performance of joint filling materials. Timely recording of crack failure failure time is also a difficult point.

Invention content:

The technical problem to be solved by the present invention is to provide a device and method for testing the bonding fatigue performance of pavement grouting materials, which is used to simulate and test the performance of pavement grouting materials, thereby solving the problem of testing the performance of pavement grouting materials Finally, in order to solve the problem of evaluating the quality of pavement filling materials in engineering practice.

The technical scheme that the present invention takes in order to solve the problems of the technologies described above is:

A device for testing the bonding fatigue performance of pavement grouting materials, including a base and a vibrating platform arranged on the base, the base and the vibrating platform are connected by a number of uniformly arranged springs, and the bottom of the vibrating platform is equipped with two Two motors with adjustable speed, the output shafts of the two motors are respectively meshed with the vertical eccentric shaft and the horizontal eccentric shaft fixed on the vibration platform through gears;

A test device is arranged above the vibration platform, and the test device includes a fixed end and a movable end, wherein the fixed end of the test device includes a test fixed end base fixed on the vibration platform and a test fixed end specimen fixed above the test fixed end base The card slot, the movable end of the test device includes the test movable end base and the test movable end specimen card slot fixed above the test movable end base;

During the test, the test piece at the fixed end is fixed in the test piece slot at the fixed end, the test piece at the movable end is fixed in the test piece slot at the movable end, and the test piece at the fixed end and the test piece at the movable end pass through The bonding interface is connected; the separation time recorder used to record the failure time of the bonding interface is set on the test fixed end base.

The further improvement of the present invention lies in that the base is fixed on the test platform, and a rubber anti-slip layer is also arranged between the base and the test platform.

The further improvement of the present invention is that: the upper end of each spring is fixed on the bottom of the vibration platform through the upper spring fixing tube, and the lower end of each spring is fixed on the base through the lower spring fixing tube.

The further improvement of the present invention is that: the test fixed end base is fixed on the vibration platform by the test fixed end base fixing screw; the test fixed end specimen slot is fixed above the test fixed end base by the test fixed end vertical fixing screw; the test fixed end The test piece is fixed in the test piece slot at the test fixed end through the horizontal fixing screw at the test fixed end.

The further improvement of the present invention is that: the base of the test movable end is set on the vibration platform through several evenly arranged universal wheels; The test piece is fixed in the test piece slot at the test movable end through the horizontal fixing screw at the test movable end.

The further improvement of the present invention lies in that: the test movable end base is also provided with a test movable end configuration.

The further improvement of the present invention lies in that two sets of testing devices and a separation time recorder are arranged on the vibrating platform.

A method for testing the bond fatigue performance of pavement filling materials, the method is based on the above-mentioned equipment for testing the bond fatigue performance of pavement filling materials, comprising the following steps:

Step 1. Make the pavement material into a standard rut slab specimen of 300mm*300mm*50mm, use the gap between the two rut slab specimens to simulate the state of the pavement cracks after the grooving treatment, and then fix the two rut slabs through the The screw is fixed on the fixed end and the movable end of the test device;

Step 2: Bond two rutting slabs at a certain distance with quantitative pavement filling materials, and keep them healthy at room temperature for 24 hours for subsequent tests;

Step 3. Fix the separation time recorder on the bonding interface, clear the recorder, start the vibration platform and start timing at the same time. During the test, change the vibration frequency and vibration direction according to the specific preset program until the bond When the interface is damaged, the two rut plate specimens are separated at this time, and the failure time recorded by the separation time recorder is read out;

Step 4. Use the time of bond interface failure, the vibration level of the vibration platform and the bond interface damage level to comprehensively evaluate the bond fatigue performance of the pavement filling material; the time of bond interface damage is directly read by the separation time recorder; the vibration platform The vibration level is determined by the preset vibration mode; the interface exposed at the end of the test is the failure interface of the bonding interface of the grouting material.

Compared with prior art, effective effect of the present invention is:

The test equipment provided by the present invention realizes the performance test of the pavement filling material, and has the advantage that it breaks through the limitation of the loading method, and uses a vibrating platform to apply repeated loads to the tested bonding interface of the joint filling material and generate repetitive loads by using the principle of inertia. relative displacement.

In terms of testing methods, the present invention can complete two groups of tests at the same time, ensuring a strong contrast relationship and test efficiency; in terms of recording data, it can accurately record the time of specimen destruction, ensuring the accuracy of data and the repeatability of tests; The cumulative vibration time, vibration level and interface damage level of bonded interface damage can be used to comprehensively and quantitatively evaluate the bonding fatigue performance of pavement joint filling materials.

To sum up, the present invention is mainly developed to solve the problem of pavement crack treatment in engineering practice, and can be used to test the performance of pavement filling materials.

Description of drawings:

Fig. 1 is the front view of the equipment that the present invention is used for testing the bonding fatigue performance of pavement grouting material;

Fig. 2 is the top view of Fig. 1;

In the figure: 1—vibration platform, 1-1—base, 1-2—rubber anti-skid layer, 1-3—downside spring fixing tube, 1-4—upper side spring fixing tube, 1-5—spring, 2— Motor, 2-1—vertical eccentric shaft, 2-2—horizontal eccentric shaft, 3—test fixed end base, 3-1—test fixed end horizontal fixing screw, 3-2—test fixed end base fixing screw, 3-3 —Test the vertical fixed screw at the fixed end, 3-4—test the specimen slot at the fixed end, 4—test the base of the movable end, 4-1—test the horizontal fixed screw at the movable end, 4-2—the universal wheel, 4-3— Test the counterweight at the movable end, 4-4—test the vertical fixed screw at the movable end, 4-5—test the slot of the specimen at the movable end, 5—test the specimen at the movable end, 6—test the specimen at the fixed end, 7—adhesive interface , 8—separation time recorder.

Detailed ways:

The present invention will be further described in detail below in conjunction with the accompanying drawings.

As shown in Figures 1 and 2, the present invention is a device for testing the bonding fatigue performance of pavement grouting materials, including a base 1-1 and a vibration platform 1 arranged on the base 1-1, the base 1-1 It is fixed on the test platform, and a rubber anti-skid layer 1-2 is also provided between the base 1-1 and the test platform to prevent the sliding caused by vibration during the operation of the whole device; between the base 1-1 and the vibration platform 1, several uniform The arranged springs 1-5 are connected, the upper end of each spring 1-5 is fixed on the bottom of the vibration platform 1 through the upper spring fixing tube 1-4, and the lower end of each spring 1-5 is fixed through the lower spring fixing tube 1-3 is fixed on the base 1-1; two motors 2 with adjustable speed are installed on the bottom of the vibration platform 1, and the output shafts of the two motors 2 are connected to the vertical eccentric shaft 2- fixed on the vibration platform 1 through gears respectively. 1 meshes with the horizontal eccentric shaft 2-2 to provide vibrations in the horizontal and vertical directions respectively;

A test device is arranged above the vibration platform 1, and the test device includes a fixed end and a movable end, wherein the fixed end of the test device includes a test fixed end base 3 fixed on the vibration platform 1 and a test device fixed on the test fixed end base 3. The fixed-end test piece slot 3-4, the movable end of the test device includes a test movable-end base 4 and a test movable-end specimen slot 4-5 fixed on the top of the test movable-end base 4;

During the test, the test piece 6 at the fixed end is fixed in the test piece slot 3-4 at the fixed end, the test piece 5 at the movable end is fixed in the slot 4-5 at the movable end, and the test piece 6 at the fixed end The specimen 5 at the test movable end is bonded together with the joint filling material to form the strength and then used for testing. The recording bonding interface 7 is set on the bonding interface 7. When the bonding interface is damaged, the recording bonding interface 7 will record the failure Time, and the separation time recorder 8 for recording the failure time of the bonding interface 7 is set on the test fixed end base 3 .

The above-mentioned test fixed end base 3 is fixed on the vibration platform 1 by the test fixed end base fixing screw 3-2; the test fixed end specimen slot 3-4 is fixed on the test fixed end base 3 by the test fixed end vertical fixing screw 3-3 above; the test piece 6 at the fixed end is fixed in the slot 3-4 of the test piece at the fixed end through the horizontal fixing screw 3-1 at the fixed end. The base 4 of the test movable end is set on the vibration platform 1 through a number of uniformly arranged universal wheels 4-2, so that it can move freely on the vibration platform 1; The fixing screw 4-4 is fixed on the base 4 of the test movable end; the test piece 5 of the test movable end is fixed in the slot 4-5 of the test movable end through the horizontal fixing screw 4-1 of the test movable end.

Further, a testing movable terminal configuration 4-3 is also provided on the testing movable terminal base 4 .

Furthermore, two sets of test devices and a separation time recorder 8 are set on the vibration platform 1, so that two sets of tests can be carried out simultaneously under the same conditions, which enhances the contrast of the tests and the accuracy of the data and improves the test efficiency.

The present invention is a method for testing the bonding fatigue performance of pavement filling materials, the method is based on the above-mentioned equipment for testing the bonding fatigue performance of road surface filling materials, comprising the following steps:

Step 1. Make the pavement material into a standard rut slab specimen of 300mm*300mm*50mm, use the gap between the two rut slab specimens to simulate the state of the pavement cracks after the grooving treatment, and then fix the two rut slabs through the The screw is fixed on the fixed end and the movable end of the test device;

Step 2: Bond two rutting slabs at a certain distance with quantitative pavement filling materials, and keep them healthy at room temperature for 24 hours for subsequent tests;

Step 3. Fix the separation time recorder on the bonding interface, clear the recorder, start the vibration platform and start timing at the same time. During the test, change the vibration frequency and vibration direction according to the specific preset program. The specific vibration See Table 1 for grades. Continue to vibrate until the bonding interface is broken, at this time the two rutting plate specimens are separated, and read the failure time recorded by the separation time recorder;

Step 4. Use the time of bond interface failure, the vibration level of the vibration platform and the bond interface damage level to comprehensively evaluate the bond fatigue performance of the pavement filling material; the time of bond interface damage is directly read by the separation time recorder; the vibration platform The vibration level is determined by the preset vibration mode, as shown in Table 1; the interface exposed at the end of the test is the failure interface of the bonding interface of the grouting material, and the damage level of the failure interface is shown in Table 2.

Table 1 Vibration level of vibration platform

Higher vibration rating scores indicate higher vibration intensity.

Table 2 Evaluation index of failure interface level

The higher the interface grade score, the more complete the bonding interface between the pavement joint filling material and the pavement at the time of failure.

Claims (8)

1. A device for testing the bonding fatigue performance of pavement grouting materials, characterized in that: comprise a base (1-1) and a vibrating platform (1) arranged on the base (1-1), the base (1 -1) is connected to the vibrating platform (1) through several uniformly arranged springs (1-5), and two motors (2) with adjustable speed are installed on the bottom of the vibrating platform (1), and the two motors (2 The output shaft of ) meshes with the vertical eccentric shaft (2-1) and the horizontal eccentric shaft (2-2) fixed on the vibrating platform (1) respectively through gears; The top of the vibration platform (1) is provided with a test device, the test device includes a fixed end and a movable end, wherein the fixed end of the test device includes a test fixed end base (3) fixed on the vibration platform (1) and a test fixed end base (3) fixed on the test fixed end. The testing fixed end specimen clamping slot (3-4) above the end base (3), the movable end of the test device includes the test movable end base (4) and the test movable end specimen fixed above the test movable end base (4) Card slot (4-5); During the test, the test piece (6) at the fixed end is fixed in the test piece slot (3-4) at the fixed end, and the test piece (5) at the movable end is fixed in the test piece slot (4-5) at the movable end , and the test piece (6) at the fixed end and the test piece (5) at the movable end are connected through the bonding interface (7); the separation time recorder (8) for recording the failure time of the bonding interface (7) Set it on the test fixed end base (3). 2. The device for testing the bonding fatigue performance of pavement grouting materials according to claim 1, characterized in that: the base (1-1) is fixed on the test bench, and the distance between the base (1-1) and the test bench is A rubber anti-slip layer (1-2) is also arranged between them. 3. The device for testing the bond fatigue performance of pavement grouting materials according to claim 1, characterized in that: the upper end of each spring (1-5) is fixed by the upper spring fixing tube (1-4) At the bottom of the vibration platform (1), the lower end of each spring (1-5) is fixed on the base (1-1) through the lower spring fixing tube (1-3). 4. The device for testing the bonding fatigue performance of pavement grouting materials according to claim 1, characterized in that: the test fixed end base (3) is fixed on the vibration platform by the test fixed end base fixing screw (3-2) (1) above; test fixed end specimen slot (3-4) is fixed above the test fixed end base (3) by the test fixed end vertical fixing screw (3-3); test fixed end specimen (6) passes The horizontal fixing screw rod (3-1) of the fixed test end is fixed in the clamping groove (3-4) of the test piece at the fixed end of the test. 5. The device for testing the bonding fatigue performance of pavement grouting materials according to claim 1, characterized in that: the test movable end base (4) is set on a vibrating surface by several uniformly arranged universal wheels (4-2). On the platform (1); the test piece slot (4-5) at the movable end of the test is fixed on the base (4) of the movable end of the test through the vertical fixing screw (4-4) at the movable end of the test; the test piece (5) at the movable end passes through The horizontal fixing screw rod (4-1) of the test movable end is fixed in the specimen clamping groove (4-5) of the test movable end. 6. The device for testing the bond fatigue performance of pavement grouting materials according to claim 1, characterized in that: the test movable end base (4) is also provided with a test movable end configuration (4-3). 7. The device for testing the bond fatigue performance of pavement grouting materials according to claim 1, characterized in that two sets of testing devices and a separation time recorder (8) are arranged on the vibrating platform (1). 8. A method for testing the bond fatigue performance of pavement grouting materials, characterized in that: the method is based on the device for testing the bond fatigue performance of pavement grouting materials according to any one of claims 1 to 7 , including the following steps: Step 1. Make the pavement material into a standard rut slab specimen of 300mm*300mm*50mm, use the gap between the two rut slab specimens to simulate the state of the pavement cracks after the grooving treatment, and then fix the two rut slabs through the The screw is fixed on the fixed end and the movable end of the test device; Step 2: Bond two rutting slabs at a certain distance with quantitative pavement filling materials, and keep them healthy at room temperature for 24 hours for subsequent tests; Step 3. Fix the separation time recorder on the bonding interface, clear the recorder, start the vibration platform and start timing at the same time. During the test, change the vibration frequency and vibration direction according to the specific preset program until the bond When the interface is damaged, the two rut plate specimens are separated at this time, and the failure time recorded by the separation time recorder is read out; Step 4. Use the time of bond interface failure, the vibration level of the vibration platform and the bond interface damage level to comprehensively evaluate the bond fatigue performance of the pavement filling material; the time of bond interface damage is directly read by the separation time recorder; the vibration platform The vibration level is determined by the preset vibration mode; the interface exposed at the end of the test is the failure interface of the bonding interface of the grouting material.