CN112345391B - Loading test device and method for road material crack load transfer behavior - Google Patents
Loading test device and method for road material crack load transfer behavior Download PDFInfo
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- CN112345391B CN112345391B CN202011361482.5A CN202011361482A CN112345391B CN 112345391 B CN112345391 B CN 112345391B CN 202011361482 A CN202011361482 A CN 202011361482A CN 112345391 B CN112345391 B CN 112345391B
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- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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Abstract
The invention relates to a loading test device and a loading test method for the load transfer behavior of a pavement material crack, which comprises two symmetrically arranged loading units, wherein a prefabricated crack is arranged between the two loading units; the loading units comprise bottom support plates, the bottom support plates of the two loading units are connected through bolts, and steel sheets are arranged in the middle of the bottom support plates; the bottom support plate is provided with chloroprene rubber, a road material test piece, a small bonding control plate and a large stable loading plate are sequentially arranged on the chloroprene rubber, and a stable control rod is arranged between the large stable loading plate and the bottom support plate and positioned at four corners of the loading unit; the upper part of the large stable loading plate is provided with a tester actuating head; and displacement sensors are symmetrically bonded on the lateral surfaces of the road material test piece on the two sides of the prefabricated crack. The dynamic load loading under the mechanical attenuation condition is realized under the reciprocating load action and under the condition of different crack widths, the dynamic load loading device has integrity and stability, and the complete and stable load transfer process can be realized.
Description
Technical Field
The invention belongs to the technical field of material crack load transfer for road engineering, and particularly relates to a loading test device and method for material crack load transfer behavior for roads.
Background
Most of the high-grade highway pavement structures in China adopt a semi-rigid base asphalt pavement form, transverse cracking is a common disease form of the semi-rigid base asphalt pavement, the transverse cracking occurs in a large amount in the early service stage of the pavement, and most of the semi-rigid base asphalt pavement structures are in a seam-carrying working state for a long time. Along with the increase of the number of times of driving load, the load transfer capacity of the joint can be gradually weakened, and in addition, due to the reasons of design, untight construction control, natural disasters or structural aging and the like, the crack area can be continuously damaged. Therefore, the research on the expansion mechanism and the law of the structural crack of the road material under the action of the reciprocating load has great significance on the safety evaluation of road engineering. In the current test for researching the mechanical attenuation condition of the cracked road material in the road engineering under different loads and crack widths, no special test tool or test device is provided, so that a test device which can conveniently carry out the loading test of the road material, has an easily controlled loading balance point, a small loading device volume and light weight, and can conveniently carry out the test of the mechanical attenuation condition of the cracked road material under different loads and crack widths so as to obtain accurate test data is needed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a loading test device and a loading test method for the crack load transfer behavior of a road material, which realize dynamic load loading under the condition of mechanical attenuation under the action of reciprocating load and different crack widths, have integrity and stability and can realize the complete and stable load transfer process.
A loading test device for the load transfer behavior of a pavement material crack comprises two symmetrically arranged loading units, wherein a prefabricated crack is arranged between the two loading units; the loading units comprise bottom support plates, the bottom support plates of the two loading units are connected through bolts, a steel sheet is arranged in the middle, and the total thickness of the steel sheet is the same as the width of a prefabricated crack; the bottom support plate is provided with chloroprene rubber, a road material test piece, a small bonding control plate and a large stable loading plate are sequentially arranged on the chloroprene rubber, and the upper surface of the small bonding control plate is connected with the large stable loading plate through a bolt; a stable control rod is arranged between the large stable loading plate and the bottom support plate and is positioned at four corners of the loading unit; the upper part of the large stable loading plate is provided with a tester actuating head; and displacement sensors are symmetrically bonded on the lateral surfaces of the road material test piece on two sides of the prefabricated crack.
The steel sheet is made of solid high-carbon steel.
The lower surface of the small bonding control plate is connected with the road material test piece through an epoxy resin adhesive, and the upper surface of the small bonding control plate is connected with the large stable loading plate through a bolt.
The big stable loading plate is provided with a hole through which the stable control rod passes, and a sliding bearing is arranged between the stable control rod and the hole.
The small bonding control plate and the large stable loading plate are steel plates.
The road material test piece is an asphalt mixture surface layer or a semi-rigid base layer.
The test method of the loading test device for the crack load transfer behavior of the road material comprises the following steps:
the method comprises the following steps: manufacturing a road material test piece according to different road materials to be tested;
step two: determining the width of a prefabricated crack according to test requirements, building a loading test device, determining a loading method and determining test parameters:
step three: connecting the tester actuating head of one loading unit with the actuator, and loading according to the loading mode determined in the step two;
step four: finishing the test after the road material test piece loses the failure, namely completely loses the load transfer capability, obtaining the displacement difference of two sides of the road material test piece, and evaluating the load transfer efficiency by using the displacement difference of two sides of the crack;
step five: and (4) changing the width of the prefabricated crack or changing the road to repeatedly test the test piece in the second step to the third step for multiple times so as to obtain different test data.
In the second step, the road material test piece can be loaded in two ways, wherein the first way is to gradually load from zero and increase by 0.1KN each time until the road material test piece fails; the second mode is that the axle load is 100KN, the pressure intensity is 0.7MPa, and the loading time is 0.01-0.1s each time until the road material test piece fails.
The invention has the beneficial effects that: the invention has less gravity influence, more importantly, can provide sufficient reciprocating load, completely controls the width of the crack by the bottom support plate and the steel sheet to realize the load transmission process of the crack under the action of the reciprocating load, is favorable for observing the cracking and expansion conditions of the crack in the road material component under the action of the reciprocating load, and provides experimental conditions for researching the load transmission mechanism of the road material structure under dynamic load. The device has the advantages of convenient operation, safety, controllability, simple structure, low cost, convenient maintenance, convenient disassembly and reutilization, and the prepared road material test piece meets the experimental requirements. The load transfer process of different crack widths under the action of reciprocating load can be completely realized, and experimental conditions are provided for researching the load transfer capability mechanism of the material component for the road under the action of dynamic load.
Drawings
FIG. 1 is a schematic view of the overall structure of the apparatus of the present invention;
FIG. 2 is a front view of FIG. 1;
FIG. 3 is a left side view of FIG. 1;
FIG. 4 is a top view of FIG. 1;
FIG. 5 is an enlarged view of a portion of the fracture junction;
wherein the content of the first and second substances,
1-bottom support plate, 2-chloroprene rubber, 3-stable control rod, 4-road material test piece, 5-small bonding control plate, 6-large stable loading plate, 7-sliding bearing, 8-testing machine actuating head, 9-displacement sensor, 10-steel sheet and 11-internal threaded hole.
Detailed Description
For better understanding of the present invention, the technical solutions and effects of the present invention will be described in detail by the embodiments with reference to the accompanying drawings.
As shown in figures 1-4, the loading test device for the load transfer behavior of the pavement material crack comprises two symmetrically arranged loading units, a prefabricated crack is arranged between the two loading units, each loading unit comprises a bottom support plate 1, as shown in figure 5, the bottom support plates 1 of the two loading units are connected through a bolt, a steel sheet 10 is arranged in the middle of each loading unit, the steel sheet 10 is made of solid high carbon (CK 101) steel, the total thickness of the steel sheet 10 is the same as the width of the prefabricated crack, and the width of the prefabricated crack is controlled through the total thickness of the steel sheet 10 between the two bottom support plates 1.
The bottom support plate 1 is provided with chloroprene rubber 2, the composite rigidity of the chloroprene rubber 2 cushion is equivalent to the roadbed reaction modulus of a reasonable roadbed, and the chloroprene rubber 2 is two plate-shaped chloroprene rubber 2 with the thickness of 7.9mm in the embodiment.
The chloroprene rubber 2 is sequentially provided with a road material test piece 4, a small bonding control plate 5 and a large stable loading plate 6, the lower surface of the small bonding control plate 5 is connected with the road material test piece 4 through an epoxy resin adhesive, and the chloroprene rubber adhesive has high adhesive strength, good stability and convenient disassembly; the upper surface of the small bonding control plate 5 is connected with the large stable loading plate 6 through a bolt, the large stable loading plate 6 is provided with corresponding internal thread holes 11, and six internal thread holes 11 are formed in the large stable loading plate 6 in the implementation. The small bonding control plate 5 and the large stable loading plate 6 are steel plates, and the road material test piece 4 is an asphalt mixture surface layer or a semi-rigid base layer.
The upper part of the large stable loading plate 6 is provided with a testing machine actuating head 8, and the testing machine actuating head 8, the stable control rod 3, the large stable loading plate 6 and the sliding bearing 7 form a reciprocating load loading transmission part on the road material test piece 4.
And displacement sensors 9 are symmetrically bonded on the side surfaces of the road material test piece 4 on two sides of the prefabricated crack, the displacement sensors 9 are high-precision dynamic displacement meters and are connected with a computer, software cataman is arranged in the computer, and when an actuator applies a load through a testing machine actuating head 8, the two displacement sensors 9 transmit acquired signals to the computer so as to obtain a displacement difference and a load and deflection curve of the road material test piece 4.
The test method of the loading test device for the load transfer behavior of the pavement material crack comprises the following steps:
the method comprises the following steps: manufacturing a road material test piece 4 according to different road materials to be tested;
step two: determining the width of a prefabricated crack according to test requirements, building a loading test device, determining a loading method and determining test parameters: the device can load the road material test piece 4 by adopting two modes, wherein the first mode is that the road material test piece 4 is gradually loaded from zero and is increased by 0.1KN each time until the road material test piece 4 fails, namely, the non-load-applying side is not influenced by the loading unit on the load-applying side, and the signal transmitted by the displacement sensor 9 on the non-load-applying side is not changed; the second mode is that the axle load is 100KN, the pressure intensity is 0.7MPa, and the loading time is 0.01-0.1s each time until the road material test piece 4 fails.
Step three: connecting the tester actuating head 8 of one loading unit with the actuator, and loading according to the loading mode determined in the step two;
step four: finishing the test after the road material test piece 4 is failed, namely completely losing the load transfer capability, obtaining the displacement difference of two sides of the road material test piece 4, and evaluating the load transfer efficiency by using the displacement difference of two sides of the crack;
step five: and (4) changing the width of the prefabricated crack or changing the road to repeatedly test the test piece in the second step to the third step, and obtaining different test data.
During the test, a reciprocating load is applied by the tester actuator head 8 to simulate the mechanical action of a pre-crack under the load of a standard axle truck moving wheel. In the test method, pre-cracked cracks are used, the initial cracks are uniform in width and are transmitted to a road material test piece 4 through a large stable loading plate 6, a small bonding control plate 5 and a sliding bearing 7. In order to control the width of the prefabricated crack on the road material test piece 4, the width of the prefabricated crack is controlled by the thickness of the steel sheet 10, and the operation is convenient and fast. The displacement sensor 9 is adhered to the pavement material test piece 4, and the force displacement curve is obtained by transmitting the acquired data to the computer, so that the test can be completed by the pavement material crack load transmission behavior load test device according to different loading requirements. And one loading unit is loaded, and the load transfer efficiency is the difference between the displacements of the loading unit without applied load and the loading unit with applied load, and is used for representing the joint performance of the road material test piece 4.
The road material test piece 4 is bonded with the small bonding control plate 5, so that the damage caused by contact of the tester actuating head 8 and other media can be avoided. When the device is used for testing, the load is only applied to one side of the prefabricated crack, if test data of different crack widths are needed, after the different crack widths are changed, the test is repeated, and then the displacement difference, the load and the deflection curve of the road material test piece 4 under the different crack widths can be obtained. The device can be used for performing joint performance tests under different crack widths and different load cycle times, and can continuously collect data or collect data after various predefined number of load cycles are applied, so that the shear strength under different conditions can be obtained. In order to simulate repeated wheel loads applied at the joint throughout the life of the test specimen, the loads were applied alternately in the upward and downward directions, with the same magnitude of load in both directions, and the entire length of the test specimen was uniformly elastically constrained at the top and bottom during the application of the loads.
Claims (2)
1. A test method of a road material crack load transfer behavior loading test device is characterized in that:
the loading test device for the load transfer behavior of the pavement material crack comprises two symmetrically arranged loading units, and a prefabricated crack is arranged between the two loading units; the loading units comprise bottom support plates, the bottom support plates of the two loading units are connected through bolts, a steel sheet is arranged in the middle, and the total thickness of the steel sheet is the same as the width of a prefabricated crack; the bottom support plate is provided with chloroprene rubber, a road material test piece, a small bonding control plate and a large stable loading plate are sequentially arranged on the chloroprene rubber, and the upper surface of the small bonding control plate is connected with the large stable loading plate through a bolt; a stable control rod is arranged between the large stable loading plate and the bottom support plate and is positioned at four corners of the loading unit; the upper part of the large stable loading plate is provided with a tester actuating head; displacement sensors are symmetrically bonded on the lateral surfaces of the road material test piece on the two sides of the prefabricated crack;
the steel sheet is made of solid high-carbon steel;
the lower surface of the small bonding control plate is connected with the road material test piece through an epoxy resin adhesive, and the upper surface of the small bonding control plate is connected with the large stable loading plate through a bolt;
the large stable loading plate is provided with a hole through which the stable control rod passes, and a sliding bearing is arranged between the stable control rod and the hole;
the road material test piece is an asphalt mixture surface layer or a semi-rigid base layer;
the test method of the loading test device for the load transfer behavior of the pavement material crack comprises the following steps:
the method comprises the following steps: manufacturing a road material test piece according to different road materials to be tested;
step two: determining the width of a prefabricated crack according to test requirements, building a loading test device, determining a loading method and determining test parameters;
step three: connecting the testing machine actuating head of one loading unit with the actuator, and loading according to the loading mode determined in the second step;
step four: finishing the test after the road material test piece loses the failure, namely completely loses the load transfer capability, obtaining the displacement difference of two sides of the road material test piece, and evaluating the load transfer efficiency by using the displacement difference of two sides of the crack;
step five: changing the width of the prefabricated crack or changing the road to repeatedly test the test piece in the second step to the third step for multiple times so as to obtain different test data;
in the second step, the road material test piece can be loaded in two ways, wherein the first way is to gradually load from zero and increase by 0.1KN each time until the road material test piece fails; the second mode is that the axle load is 100KN, the pressure intensity is 0.7MPa, and the loading time is 0.01-0.1s each time until the road material test piece fails.
2. The loading test device for the crack transfer behavior of the road material as claimed in claim 1, wherein: the small bonding control plate and the large stable loading plate are steel plates.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011361482.5A CN112345391B (en) | 2020-11-27 | 2020-11-27 | Loading test device and method for road material crack load transfer behavior |
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| CN202011361482.5A CN112345391B (en) | 2020-11-27 | 2020-11-27 | Loading test device and method for road material crack load transfer behavior |
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| CN112345391B true CN112345391B (en) | 2023-03-31 |
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| CN114459895A (en) * | 2021-12-31 | 2022-05-10 | 广州市交通设计研究院有限公司 | Test method for evaluating anti-reflection crack capability of stress absorption layer |
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| CN101923044A (en) * | 2010-07-27 | 2010-12-22 | 长安大学 | GF (Gravity Force) multifunctional story-force tester |
| US9057163B1 (en) * | 2013-03-15 | 2015-06-16 | William B. Coe | Pavement repair system |
| CN104865108B (en) * | 2015-01-13 | 2017-06-16 | 中国水利水电科学研究院 | Sample preparation device, sample preparation shear and sample preparation shearing test method suitable for jointed rock mass direct shear test |
| CN105043865B (en) * | 2015-06-02 | 2017-08-25 | 水利部交通运输部国家能源局南京水利科学研究院 | Concrete damage fracture property method of testing under double-field coupled |
| CN205749164U (en) * | 2016-04-30 | 2016-11-30 | 山西省交通科学研究院 | A kind of sandwich establishment asphalt Reflection Cracking performance testing device |
| CN210090177U (en) * | 2019-04-10 | 2020-02-18 | 南京工程学院 | Laboratory is with old and new concrete split and draw shear test multifunctional mold |
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