CN109946222B - Device and method for evaluating rut influence factors of asphalt pavement - Google Patents
Device and method for evaluating rut influence factors of asphalt pavement Download PDFInfo
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Abstract
The invention relates to a device and a method for evaluating rutting influence factors of an asphalt pavement, wherein a control box of the device is positioned at the lower part of the device, the interior of the control box comprises a power device and a temperature control device, an operation box is positioned above the control box, the interior of the operation box comprises a first display panel, a control panel, a central controller and a second display panel, and a test piece is positioned above the operation box and placed on a rubber base; the concave wheel is a pressure applying device for testing, and the power shaft is a power device for driving the concave wheel to move back and forth; the test box is used for carrying out a test; the method adopts a test piece to complete the comparison tests of different test conditions, and realizes the control of the variables generated by different test pieces so as to accurately test results; the influence of various influencing factors on the generation and development of the tracks on the asphalt pavement can be researched; a set of complete evaluation indexes is established for evaluating the influence degree of simulation states of different test conditions on the generation and development of the tracks on the asphalt pavement.
Description
Technical Field
The invention relates to the field of asphalt pavement rutting, in particular to a device and a method for evaluating asphalt pavement rutting influence factors.
Background
Because the asphalt pavement has the advantages of comfortable driving, low noise, high construction speed, convenient maintenance and the like, the asphalt pavement is basically adopted in the construction of the expressway. The data show that more than 95% of the constructed highways in China adopt asphalt pavements. When a large amount of asphalt pavements are paved, the problem of asphalt pavement diseases is highlighted. Rutting is one of the most prominent. Compared with cracking and water damage, the rutting has higher danger and directly harms traffic safety. Also, rutting is the most difficult to repair because rutting occurs not only at the surface, but often also in the middle and lower layers. The reason why the prevention of rutting is put at the first place in the damage of asphalt pavement in all countries of the world has been all the time.
At present, a plurality of achievements are obtained by utilizing scholars to research the rutting resistance of the asphalt mixture, but certain defects still exist in the research of factors influencing the rutting of the asphalt pavement and a test method. In the conventional rut test, there are mainly the following problems:
(1) the contrast test without test conditions can not be completed by adopting one test piece, and the test result error caused by different test pieces can not be completely controlled;
(2) the influence on the formation of the ruts on the same asphalt pavement under different test conditions cannot be simultaneously carried out;
(3) the research on factors influencing the generation and development of the asphalt pavement is not thorough;
(4) a set of systematic evaluation indexes is lacked for evaluating the influence degree of simulation states of different test conditions on the generation and development of the tracks on the asphalt pavement.
Disclosure of Invention
The technical problem is as follows: the invention aims to provide a device and a method for evaluating rutting influence factors of an asphalt pavement, which are used for solving part of problems in the conventional rutting test. The method comprises the following steps of finishing comparison tests under different test conditions by using one test piece, and controlling variables generated by different test pieces so as to accurately test results; a set of complete evaluation indexes is established for evaluating the influence degree of simulation states of different test conditions on the generation and development of the tracks on the asphalt pavement.
The technical scheme is as follows: the invention relates to a device for evaluating rutting influence factors of an asphalt pavement, which comprises the following parts:
the control box is positioned at the lower part of the device, and internally comprises a power device and a temperature control device, wherein the power device is used for providing power for lifting the isolation plate and power for driving the power shaft to drive the concave wheel to move back and forth, and the temperature control device is used for adjusting and controlling the test temperature of the left part in the test box; the operation box is positioned above the control box, the operation box internally comprises a first display panel, a control panel, a central controller and a second display panel, the first display panel is used for displaying the left test temperature in the test box, the second display panel is used for displaying the right test temperature in the test box, the control panel and the central controller are used for inputting and controlling various test conditions, and the test piece is positioned above the operation box and placed on the rubber base; the concave wheel is a pressure applying device for testing, and the test applies load on the inflatable rubber hose through the concave wheel and indirectly transfers the load to the surface of the test piece; the power shaft is a power device which drives the concave wheel to move back and forth; the test box is used for carrying out a test; the first temperature sensor is used for sensing the test temperature of the left part in the test chamber; the air inlet is positioned at the upper part of the left part in the test box, and can be used for feeding cold air and hot air so as to adjust and control the test temperature of the left part in the test box; the water inlet is positioned at the upper part of the right part in the test box and is used for simulating different rainfall conditions; the second temperature sensor is used for sensing the right test temperature in the test chamber; the isolation plate is used for isolating a test piece into 2 test areas, so that the purpose of testing the same test piece under different test conditions is achieved; the rubber clamping grooves are positioned at the bottom and the rear part of the isolation plate and are used for completely isolating the left part and the right part in the experiment box, so that different experiment conditions are formed.
Wherein the various test conditions are: temperature, precipitation, rolling speed and rolling duration.
The device of the invention explores the method of the influence of different temperatures on the rutting of the asphalt pavement, firstly, the asphalt mixture adopted in the test is insulated for one to three hours at 140-170 ℃ to simulate the short-term aging in the production process of the asphalt mixture, then the asphalt mixture is molded by a wheel rolling machine, the concave wheel load is set to be a N, the inflation pressure of an inflatable rubber hose is b kpa, the operation frequency of the concave wheel is c Hz, namely c round trips/minute, and the test time t is input through a control panel and a central controller;
placing the molded test piece on a rubber base, and adjusting the position of the isolation plate to enable the bottom of the rubber clamping groove to be in close contact with the test piece so as to achieve a sealing effect; the temperature control device is opened, and the required test temperature T is input through the control panel and the central controller1Observing the value in the first display panel until it reaches the target value T1And recording the value T of the second display panel after stabilization2The experiment is started after representing the experiment temperature of the right part in the experiment box; the left part and the right part in the test box start to test at the same time, and wait for the test to finish; after the experiment, the depth of the left and right ruts is measured to be d1And d2The influence of temperature on the generation and development of ruts on the asphalt pavement was evaluated by the following formula:
wherein α is a temperature influence coefficient, d1And d2Respectively measuring the rut depth, T, of the left and right test pieces in the experiment box1And T2The test temperatures in the left and right of the experimental box are indicated.
The device of the invention explores the method of the influence of different precipitation to the rutting of the bituminous pavement, first, keep warm for one to three hours at 140 duC 170 duC of bituminous mixture that the experiment uses, in order to simulate the short-term aging in the production run of bituminous mixture, then utilize the roller compaction appearance to shape, input and set the concave wheel load as a N through control panel and central controller, the inflation pressure of the rubber hose of inflation is b kpa, the concave wheel operating frequency is c Hz, namely c round trips/minute, and test time t;
placing the molded test piece on a rubber base, and adjusting the position of the isolation plate to enable the bottom of the rubber clamping groove to be in close contact with the test piece so as to achieve a sealing effect; opening a water inlet, supplying water by an external water source of the rubber water pipe, inputting a set precipitation L ml through a control panel and a central controller, and controlling the precipitation to be injected within a set range; after the precipitation is finished for a period of time, starting the test through the control panel and the central controller, simultaneously starting the test on the left part and the right part in the test box, and waiting for the test to be finished; after the experiment, the depth of the left and right ruts is measured to be d3And d4The influence of temperature on the generation and development of ruts on the asphalt pavement was evaluated by the following formula:
wherein beta is the influence coefficient of precipitation, d3And d4And respectively measuring the rut depths of the left and right test pieces in the experiment box for the experiment, inputting the set precipitation amount for the control panel and the central controller by L, and respectively setting the surface area of the test piece, namely the area of the left and right test pieces to be S/2 by S.
The method for researching the influence of different axial times on the rutting of the asphalt pavement comprises the steps of firstly, preserving the temperature of an asphalt mixture adopted in a test at 140-170 ℃ for one to three hours to simulate the short-term aging in the production process of the asphalt mixture, then forming by using a wheel rolling machine, inputting and setting the concave wheel load to be a N, the inflation pressure of an inflatable rubber hose to be b kpa, the operation frequency of a concave wheel to be c Hz, namely c times of round trip/minute, and performing the left part test in a test boxTime t1And the right part test time t in the test chamber2；
Placing the molded test piece on a rubber base, and adjusting the position of the isolation plate to enable the bottom of the rubber clamping groove to be in close contact with the test piece so as to achieve a sealing effect; starting the test through the control panel and the central controller, simultaneously starting the test on the left part and the right part in the test box, and waiting for the test to be ended; after the experiment, the depth of the left and right ruts is measured to be d5And d6The influence of the axle times on the generation and development of the tracks on the asphalt pavement is evaluated by the following formula:
wherein gamma is the axial order coefficient of influence, d5And d6The rut depths, t, of the left and right test pieces in the experimental box are respectively measured for the experiment2And t1The test time is respectively carried out at the right part and the left part in the test box, and c is the concave wheel running frequency of c Hz, namely c times of round trip/minute.
The device of the invention explores the method of the influence of different axial times on the rutting of the asphalt pavement, firstly, the asphalt mixture adopted in the test is insulated for one to three hours at 140-170 ℃ to simulate the short-term aging in the production process of the asphalt mixture, then the asphalt mixture is molded by a wheel rolling machine, the concave wheel load is set to be a N through the input of a control panel and a central controller, the inflation pressure of an inflatable rubber hose is b kpa, the running frequency of a left concave wheel in a test box is c Hz, namely c round trips/minute, the right part test time t in the test box, the running frequency of a right concave wheel in the test box is 2c Hz, namely 2c round trips/minute, and the left part test time t/2 in the test box;
placing the molded test piece on a rubber base, and adjusting the position of the isolation plate to enable the bottom of the rubber clamping groove to be in close contact with the test piece so as to achieve a sealing effect; starting the test through the control panel and the central controller, simultaneously starting the test on the left part and the right part in the test box, and waiting for the test to be ended; after the experiment, the depth of the left and right ruts is measured to be d7And d8Disclosure of the inventionThe influence of the rolling speed on the generation and development of the tracks on the asphalt pavement is evaluated by the following formula:
wherein, delta is the influence coefficient of rolling speed, d7And d8And respectively measuring the rutting depths of the left and right test pieces in the test box by the test, wherein the running frequency of the left concave wheel in the test box is c Hz (namely c round trips/minute), and 2c is the running frequency of the right concave wheel in the test box is 2c Hz (namely 2c round trips/minute).
Has the advantages that: compared with the traditional rut test, (1) the test piece is adopted to complete the comparison test of different test conditions, and the variable generated by different test pieces is controlled, so that the test result is accurate; (2) the control method can simultaneously carry out comparison tests, thereby more intuitively reflecting the influence of experimental conditions and rut influence factors on the generation and development of ruts; (3) the influence of various influencing factors on the generation and development of the tracks on the asphalt pavement can be researched; (4) a set of complete evaluation indexes is established for evaluating the influence degree of simulation states of different test conditions on the generation and development of the tracks on the asphalt pavement.
Drawings
FIG. 1 is a front view of the test apparatus;
FIG. 2 is a detail view of the separator plate;
FIG. 3 is a detail view of a specimen portion;
figure 4 is a schematic illustration of the operation of the concave wheel.
In the figure: 1-control box, 2-power device, 3-operation box, 4-display panel, 5-control panel and central controller, 6-test piece, 7-concave wheel, 8-power shaft, 9-test box, 10-sensor, 11-air inlet, 12-water inlet, 13-sensor, 14-isolation plate, 15-display panel, 16-temperature control device, 17-rubber clamping groove, 18-rubber base and 19-inflatable rubber hose.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The test device mainly comprises the following parts: the device comprises a control box 1, a power device 2 and a temperature control device 16, wherein the control box is positioned at the bottommost part of the device, the power device 2 is used for providing power for lifting a separation plate and power for driving a power shaft to drive a concave wheel to move back and forth, and the temperature control device 16 is used for adjusting and controlling the test temperature of the left part in a test box; the operation box is positioned above the control box 1, and the operation box internally comprises a display panel 4, a control panel 5, a central controller and a display panel 15, wherein the display panel 4 is used for displaying the left test temperature in the test box, the display panel 15 is used for displaying the right test temperature in the test box, and the control panel 5 and the central controller are used for inputting and controlling various test conditions, such as temperature, precipitation, rolling speed, rolling time and the like; 6, placing a test piece above the 3 operation boxes on an 18 rubber base; the 7 concave wheel is a pressure applying device for testing, and the test applies load on the inflatable rubber hose through the concave wheel and indirectly transmits the load to the surface of the test piece. 8, the power shaft is a power device for driving the concave wheel to move back and forth; 9 is a test box for testing; the sensor 10 is a temperature sensor and is used for sensing the test temperature of the left part in the test chamber; 11, an air inlet is positioned at the left part in the test box, and cold air and hot air can be fed in the air inlet to adjust and control the left part experiment temperature in the test box; 12 the water inlet is positioned at the right part in the test box and used for simulating different rainfall conditions; the sensor 13 is a temperature sensor and is used for sensing the right test temperature in the test chamber; the 14 isolating plates are used for isolating a test piece into 2 test areas, so that the purpose of testing the same test piece under different test conditions is achieved; and the 17 rubber clamping grooves are positioned at the bottom and the rear part of the 14 isolating plate and are used for completely isolating the left part and the right part in the experiment box, so that different experiment conditions are formed.
Example one: the influence of different temperatures on the ruts of the asphalt pavement is explored
Firstly, the asphalt mixture adopted in the test is kept at 160 ℃ for two hours to simulate the short-term aging in the production process of the asphalt mixture, then the asphalt mixture is molded by using a rolling machine, the load of the concave wheel 7 is set to be a N through the input of the control panel 5 and a central controller, the inflation pressure of a rubber pipe is b kpa, the running frequency of the concave wheel 7 is c Hz, namely c round trips/minute, and the test time t is measured.
Placing the molded test piece 6 on a rubber base 18, and adjusting the position of the isolation plate 14 to enable the bottom of the rubber clamping groove 17 to be tightly contacted with the test piece 6 so as to achieve a sealing effect; the temperature control device 16 is turned on, and the required test temperature T is input through the control panel 5 and the central controller1Observe the value in the first display panel 4 until it reaches the target value T1And records the value T of the second display panel 15 after the value T is stabilized2The test is started after representing the test temperature in the right part of the test box 9; the left part and the right part in the test box 9 start the test at the same time and wait for the test to end. After the experiment, the depth of the left and right ruts is measured to be d1And d2The influence of temperature on the generation and development of ruts on the asphalt pavement was evaluated by the following formula:
wherein α is a temperature influence coefficient, d1And d2Respectively measuring the rut depth, T, of the left and right test pieces in the experiment box1And T2The test temperatures in the left and right of the experimental box are indicated.
A rubber solid tire with a wheel load of 78kg and a contact pressure of 0.7Mpa at 60 ℃ is subjected to corresponding experiments at a reciprocating rolling speed of 21 times per minute at a temperature of 10 ℃, 20 ℃, 30 ℃, 40 ℃, 50 ℃ and 60 ℃, and the experimental results are recorded as follows (rolling time: 10min rolling times: 420):
example two: the influence of different precipitation amounts on the ruts of the asphalt pavement is explored
Firstly, the asphalt mixture adopted in the test is kept at 160 ℃ for two hours to simulate the short-term aging in the production process of the asphalt mixture, then the asphalt mixture is molded by using a rolling machine, 7 concave wheel loads are input and set to be a N through a control panel 5 and a central controller, the inflation pressure of a rubber pipe is b kpa, the running frequency of a concave wheel 7 is c Hz, namely c round trips/minute, and the test time t is obtained.
Placing the molded test piece 6 on a rubber base 18, and adjusting the position of the isolation plate 14 to enable the bottom of the rubber clamping groove 17 to be tightly contacted with the test piece 6 so as to achieve a sealing effect; opening the water inlet 12, supplying water by an external water source of the rubber water pipe, inputting a set precipitation L ml through the control panel 5 and the central controller, and controlling the precipitation within a certain range; after the precipitation is finished for a period of time, the test is started through the control panel 5 and the central controller, the test is started simultaneously on the left part and the right part in the test box 9, and the test is waited to be finished. After the experiment, the depth of the left and right ruts is measured to be d3And d4The influence of temperature on the generation and development of ruts on the asphalt pavement was evaluated by the following formula:
wherein beta is the influence coefficient of precipitation, d3And d4And respectively measuring the rut depths of the left and right test pieces in the experiment box for the experiment, inputting the set precipitation amount for the control panel and the central controller by L, and respectively setting the surface area of the test piece, namely the area of the left and right test pieces to be S/2 by S.
A rubber solid tire with a wheel load of 78kg and a contact pressure of 0.7MPa at 60 ℃ is subjected to corresponding experiments at a rolling speed of 21 times of reciprocating/min at a size of 300mm multiplied by 50mm, and the experimental results are recorded as follows:
example three: exploring the influence of different axial times on the ruts of the asphalt pavement
Firstly, the asphalt mixture adopted in the test is kept at 160 ℃ for two hours to simulate the short-term aging in the production process of the asphalt mixture, and then a rolling mill is utilizedForming, setting the load of the concave wheel 7 to be a N, the inflation pressure of the rubber tube to be b kpa, the running frequency of the concave wheel 7 to be c Hz, namely c times of round trips/minute, and the left test time t in the test box through the input of the control panel 5 and the central controller1And the right part test time t in the test chamber2。
Placing the molded test piece 6 on a rubber base 18, and adjusting the position of the isolation plate 14 to enable the bottom of the rubber clamping groove 17 to be tightly contacted with the test piece 6 so as to achieve a sealing effect; the test is started by the control panel 5 and the central controller, and the test is started simultaneously by the left part and the right part in the test box 9 to wait for the test to be finished. After the experiment, the depth of the left and right ruts is measured to be d5And d6The influence of the axle times on the generation and development of the tracks on the asphalt pavement is evaluated by the following formula:
wherein gamma is the axial order coefficient of influence, d5And d6The rut depths, t, of the left and right test pieces in the experimental box are respectively measured for the experiment2And t1The experiment time is respectively carried out at the right part and the left part in the experiment box, and c is the operation frequency of the concave wheel is c Hz, namely c times of round trip/minute
The rubber solid tire with 78kg of wheel load and 0.7Mpa of contact pressure at 60 ℃ is subjected to corresponding experiments at the rolling speed of 21 times of rolling/min and the temperature of 20 ℃ and the experimental results are recorded as follows:
example four: the influence of different rolling speeds on the ruts of the asphalt pavement is explored
Firstly, the asphalt mixture adopted in the test is kept at 160 ℃ for two hours to simulate the short-term aging in the production process of the asphalt mixture, then the asphalt mixture is formed by using a rolling machine, the load of a concave wheel 7 is set to be a N through the input of a control panel 5 and a central controller, the inflation pressure of a rubber pipe is b kpa, the running frequency of a left concave wheel in a test box 9 is c Hz, namely c round trips/minute, the test time t at the right part in the test box, the running frequency of a right concave wheel in the test box is 2c Hz, namely 2c round trips/minute, and the test time t/2 at the left part in the test box.
Placing the molded test piece 6 on a rubber base 18, and adjusting the position of the isolation plate 14 to enable the bottom of the rubber clamping groove 17 to be tightly contacted with the test piece 6 so as to achieve a sealing effect; the test is started by the control panel 5 and the central controller, and the test is started simultaneously by the left part and the right part in the test box 9 to wait for the test to be finished. After the experiment, the depth of the left and right ruts is measured to be d7And d8The influence of the rolling speed on the generation and development of the ruts on the asphalt pavement is evaluated by the following formula:
wherein, delta is the influence coefficient of rolling speed, d7And d8And respectively measuring the rutting depths of the left and right test pieces in the test box by the test, wherein the running frequency of the left concave wheel in the test box is c Hz (namely c round trips/minute), and 2c is the running frequency of the right concave wheel in the test box is 2c Hz (namely 2c round trips/minute).
The corresponding experiment is carried out by adopting the rubber solid tire with the wheel load of 78kg, the contact pressure of 0.7Mpa at 60 ℃ and the controlled temperature of 30 ℃, and the experimental results are recorded as the following table:
Claims (4)
1. a method for evaluating rutting influence factors of an asphalt pavement is characterized in that the method is based on a device comprising the following parts:
the control box (1) is positioned at the lower part of the device, and the interior of the control box contains a power device (2) and a temperature control device (16), wherein the power device (2) is used for providing power for lifting the isolation plate and power for driving the concave wheel to move back and forth by the power shaft, and the temperature control device (16) is used for adjusting and controlling the test temperature of the left part in the test box; the operation box (3) is positioned above the control box (1), and the inside of the operation box contains a first display panel (4), a control panel (5), a central controller and a second display panel (15), wherein the first display panel (4) is used for displaying the left test temperature in the test box, the second display panel (15) is used for displaying the right test temperature in the test box, the control panel (5) and the central controller are used for inputting and controlling various test conditions, and the test piece (6) is positioned above the operation box (3) and placed on the rubber base (18); the concave wheel (7) is a pressure applying device for testing, and the test applies load on the inflatable rubber hose (19) through the concave wheel (7) and indirectly transmits the load to the surface of the test piece; the power shaft (8) is a power device which drives the concave wheel (7) to move back and forth; the test box (9) is used for carrying out a test; the first temperature sensor (10) is used for sensing the left test temperature in the test chamber; the air inlet (11) is positioned at the upper part of the left part in the test box (9) and can be used for feeding cold air and hot air so as to adjust and control the test temperature of the left part in the test box; the water inlet (12) is positioned at the upper part of the right part in the test box and is used for simulating different rainfall conditions; the second temperature sensor (13) is used for sensing the right test temperature in the test chamber; the isolation plate (14) is used for isolating a test piece into 2 test areas, so that the purpose of testing the same test piece under different test conditions is achieved; the rubber clamping grooves (17) are positioned at the bottom and the rear part of the isolating plate (14) and are used for completely isolating the left part and the right part in the test box, so that different test conditions are formed;
the various test conditions described were: temperature, precipitation, rolling speed and rolling duration;
the method for researching the influence of different temperatures on the tracks of the asphalt pavement comprises the following steps: firstly, insulating the asphalt mixture adopted in the test for one to three hours at the temperature of 140-170 ℃ to simulate the short-term aging in the production process of the asphalt mixture, then forming by using a wheel rolling machine, inputting and setting the load of a concave wheel (7) to a N through a control panel (5) and a central controller, wherein the inflation pressure of an inflatable rubber hose (19) is b kpa, the operating frequency of the concave wheel (7) is c Hz, namely c times of round trip/minute, and the test time t;
placing the formed test piece (6) on a rubber base (18),the position of the isolation plate (14) is adjusted to ensure that the bottom of the rubber clamping groove (17) is in close contact with the test piece (6) so as to achieve the sealing effect; the temperature control device (16) is opened, and the required test temperature T is input through the control panel (5) and the central controller1Observing the value in the first display panel (4) until it reaches the target value T1And after stabilization, the value T of the second display panel (15) is recorded2The test is started after representing the test temperature of the right part in the test box (9); the left part and the right part in the test box (9) start to test at the same time, and wait for the test to finish; after the experiment, the depth of the left and right ruts is measured to be d1And d2The influence of temperature on the generation and development of ruts on the asphalt pavement was evaluated by the following formula:
wherein α is a temperature influence coefficient, d1And d2The rut depths, T, of the left and right test pieces in the test box are respectively measured for the test1And T2The test temperatures are the left and right part of the test chamber, respectively.
2. A method for evaluating rutting influence factors of an asphalt pavement is characterized in that the method is based on a device comprising the following parts:
the control box (1) is positioned at the lower part of the device, and the interior of the control box contains a power device (2) and a temperature control device (16), wherein the power device (2) is used for providing power for lifting the isolation plate and power for driving the concave wheel to move back and forth by the power shaft, and the temperature control device (16) is used for adjusting and controlling the test temperature of the left part in the test box; the operation box (3) is positioned above the control box (1), and the inside of the operation box contains a first display panel (4), a control panel (5), a central controller and a second display panel (15), wherein the first display panel (4) is used for displaying the left test temperature in the test box, the second display panel (15) is used for displaying the right test temperature in the test box, the control panel (5) and the central controller are used for inputting and controlling various test conditions, and the test piece (6) is positioned above the operation box (3) and placed on the rubber base (18); the concave wheel (7) is a pressure applying device for testing, and the test applies load on the inflatable rubber hose (19) through the concave wheel (7) and indirectly transmits the load to the surface of the test piece; the power shaft (8) is a power device which drives the concave wheel (7) to move back and forth; the test box (9) is used for carrying out a test; the first temperature sensor (10) is used for sensing the left test temperature in the test chamber; the air inlet (11) is positioned at the upper part of the left part in the test box (9) and can be used for feeding cold air and hot air so as to adjust and control the test temperature of the left part in the test box; the water inlet (12) is positioned at the upper part of the right part in the test box and is used for simulating different rainfall conditions; the second temperature sensor (13) is used for sensing the right test temperature in the test chamber; the isolation plate (14) is used for isolating a test piece into 2 test areas, so that the purpose of testing the same test piece under different test conditions is achieved; the rubber clamping grooves (17) are positioned at the bottom and the rear part of the isolating plate (14) and are used for completely isolating the left part and the right part in the test box, so that different test conditions are formed;
the various test conditions described were: temperature, precipitation, rolling speed and rolling duration;
the method for researching the influence of different precipitation amounts on the rutting of the asphalt pavement comprises the following steps of firstly, preserving the temperature of an asphalt mixture adopted in a test at 140-170 ℃ for one to three hours to simulate the short-term aging in the production process of the asphalt mixture, then forming by using a wheel rolling machine, inputting and setting the load of a concave wheel (7) to be a N through a control panel (5) and a central controller, setting the inflation pressure of an inflatable rubber hose (19) to be bkpa, setting the running frequency of the concave wheel (7) to be c Hz, namely c times of round trip/minute, and testing time t;
placing the formed test piece (6) on a rubber base (18), and adjusting the position of an isolation plate (14) to enable the bottom of a rubber clamping groove (17) to be in close contact with the test piece (6) so as to achieve a sealing effect; opening a water inlet (12), supplying water by an external water source of a rubber water pipe, inputting a set precipitation L ml through a control panel (5) and a central controller, and controlling the precipitation within a set range; after the precipitation is finished for a period of time, starting the test through the control panel (5) and the central controller, simultaneously starting the test on the left part and the right part in the test box (9), and waiting for the test to be finished; after the experiment, the depth of the left and right ruts is measured to be d3And d4The influence of precipitation on the generation and development of the ruts on the asphalt pavement is evaluated by the following formula:
wherein beta is the influence coefficient of precipitation, d3And d4And respectively measuring the rutting depths of the left and right test pieces in the test box for the test, inputting the set precipitation amount for the control panel and the central controller by L, and respectively setting the surface area of the test piece, namely the area of the left and right test pieces to be S/2 by S.
3. A method for evaluating rutting influence factors of an asphalt pavement is characterized in that the method is based on a device comprising the following parts:
the control box (1) is positioned at the lower part of the device, and the interior of the control box contains a power device (2) and a temperature control device (16), wherein the power device (2) is used for providing power for lifting the isolation plate and power for driving the concave wheel to move back and forth by the power shaft, and the temperature control device (16) is used for adjusting and controlling the test temperature of the left part in the test box; the operation box (3) is positioned above the control box (1), and the inside of the operation box contains a first display panel (4), a control panel (5), a central controller and a second display panel (15), wherein the first display panel (4) is used for displaying the left test temperature in the test box, the second display panel (15) is used for displaying the right test temperature in the test box, the control panel (5) and the central controller are used for inputting and controlling various test conditions, and the test piece (6) is positioned above the operation box (3) and placed on the rubber base (18); the concave wheel (7) is a pressure applying device for testing, and the test applies load on the inflatable rubber hose (19) through the concave wheel (7) and indirectly transmits the load to the surface of the test piece; the power shaft (8) is a power device which drives the concave wheel (7) to move back and forth; the test box (9) is used for carrying out a test; the first temperature sensor (10) is used for sensing the left test temperature in the test chamber; the air inlet (11) is positioned at the upper part of the left part in the test box (9) and can be used for feeding cold air and hot air so as to adjust and control the test temperature of the left part in the test box; the water inlet (12) is positioned at the upper part of the right part in the test box and is used for simulating different rainfall conditions; the second temperature sensor (13) is used for sensing the right test temperature in the test chamber; the isolation plate (14) is used for isolating a test piece into 2 test areas, so that the purpose of testing the same test piece under different test conditions is achieved; the rubber clamping grooves (17) are positioned at the bottom and the rear part of the isolating plate (14) and are used for completely isolating the left part and the right part in the test box, so that different test conditions are formed;
the various test conditions described were: temperature, precipitation, rolling speed and rolling duration;
the method for researching the influence of different axial times on the rutting of the asphalt pavement comprises the steps of firstly, preserving the temperature of an asphalt mixture adopted in a test at 140-170 ℃ for one to three hours to simulate the short-term aging in the production process of the asphalt mixture, then forming by using a wheel rolling machine, inputting and setting the load of a concave wheel (7) to be a N, the inflation pressure of an inflatable rubber hose (19) to be b kpa, the operation frequency of the concave wheel (7) to be c Hz, namely c times of round trip/minute, and the left test time t in a test box by using a control panel (5) and a central controller1And the right part test time t in the test chamber2；
Placing the formed test piece (6) on a rubber base (18), and adjusting the position of an isolation plate (14) to enable the bottom of a rubber clamping groove (17) to be in close contact with the test piece (6) so as to achieve a sealing effect; starting the test through the control panel (5) and the central controller, simultaneously starting the test on the left part and the right part in the test box (9), and waiting for the test to be ended; after the experiment, the depth of the left and right ruts is measured to be d5And d6The influence of the axle times on the generation and development of the tracks on the asphalt pavement is evaluated by the following formula:
wherein gamma is the axial order coefficient of influence, d5And d6The rut depths, t, of the left and right test pieces in the test box are respectively measured for the test2And t1The test time is respectively carried out at the right part and the left part in the test box, and c is the concave wheel running frequency of c Hz, namely c times of round trip/minute.
4. A method for evaluating rutting influence factors of an asphalt pavement is characterized in that the method is based on a device comprising the following parts:
the control box (1) is positioned at the lower part of the device, and the interior of the control box contains a power device (2) and a temperature control device (16), wherein the power device (2) is used for providing power for lifting the isolation plate and power for driving the concave wheel to move back and forth by the power shaft, and the temperature control device (16) is used for adjusting and controlling the test temperature of the left part in the test box; the operation box (3) is positioned above the control box (1), and the inside of the operation box contains a first display panel (4), a control panel (5), a central controller and a second display panel (15), wherein the first display panel (4) is used for displaying the left test temperature in the test box, the second display panel (15) is used for displaying the right test temperature in the test box, the control panel (5) and the central controller are used for inputting and controlling various test conditions, and the test piece (6) is positioned above the operation box (3) and placed on the rubber base (18); the concave wheel (7) is a pressure applying device for testing, and the test applies load on the inflatable rubber hose (19) through the concave wheel (7) and indirectly transmits the load to the surface of the test piece; the power shaft (8) is a power device which drives the concave wheel (7) to move back and forth; the test box (9) is used for carrying out a test; the first temperature sensor (10) is used for sensing the left test temperature in the test chamber; the air inlet (11) is positioned at the upper part of the left part in the test box (9) and can be used for feeding cold air and hot air so as to adjust and control the test temperature of the left part in the test box; the water inlet (12) is positioned at the upper part of the right part in the test box and is used for simulating different rainfall conditions; the second temperature sensor (13) is used for sensing the right test temperature in the test chamber; the isolation plate (14) is used for isolating a test piece into 2 test areas, so that the purpose of testing the same test piece under different test conditions is achieved; the rubber clamping grooves (17) are positioned at the bottom and the rear part of the isolating plate (14) and are used for completely isolating the left part and the right part in the test box, so that different test conditions are formed;
the various test conditions described were: temperature, precipitation, rolling speed and rolling duration;
the method for researching the influence of different rolling speeds on the rutting of the asphalt pavement comprises the steps of firstly, keeping the temperature of an asphalt mixture adopted in a test at 140-170 ℃ for one to three hours to simulate short-term aging in the production process of the asphalt mixture, then forming by using a wheel rolling machine, inputting and setting the load of a concave wheel (7) to be a N through a control panel (5) and a central controller, setting the inflation pressure of an inflatable rubber hose (19) to be bkpa, setting the operating frequency of a left concave wheel in a test box (9) to be c Hz, namely c round trips/minute, setting the right part test time t in the test box, setting the operating frequency of a right concave wheel in the test box to be 2c Hz, namely 2c round trips/minute, and setting the left part test time t/2 in the test box;
placing the formed test piece (6) on a rubber base (18), and adjusting the position of an isolation plate (14) to enable the bottom of a rubber clamping groove (17) to be in close contact with the test piece (6) so as to achieve a sealing effect; starting the test through the control panel (5) and the central controller, simultaneously starting the test on the left part and the right part in the test box (9), and waiting for the test to be ended; after the experiment, the depth of the left and right ruts is measured to be d7And d8The influence of the rolling speed on the generation and development of the ruts on the asphalt pavement is evaluated by the following formula:
wherein, delta is the influence coefficient of rolling speed, d7And d8And respectively measuring the rutting depths of the left and right test pieces in the test box by the test, wherein c is the running frequency of the left concave wheel in the test box which is c Hz, namely c round trips/minute, and 2c is the running frequency of the right concave wheel in the test box which is 2c Hz, namely 2c round trips/minute.
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Citations (3)
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| US5659140A (en) * | 1996-08-13 | 1997-08-19 | Pavement Technology, Inc. | Testing machine for pavement samples |
| CN204269495U (en) * | 2014-11-24 | 2015-04-15 | 长安大学 | A kind of ground surface material accelerates abrasion laboratory testing rig |
| CN207936648U (en) * | 2017-12-27 | 2018-10-02 | 山东科技大学 | A kind of intelligent cooling table electrothermal air blast thermostatic drying chamber that diversified can be used |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5659140A (en) * | 1996-08-13 | 1997-08-19 | Pavement Technology, Inc. | Testing machine for pavement samples |
| CN204269495U (en) * | 2014-11-24 | 2015-04-15 | 长安大学 | A kind of ground surface material accelerates abrasion laboratory testing rig |
| CN207936648U (en) * | 2017-12-27 | 2018-10-02 | 山东科技大学 | A kind of intelligent cooling table electrothermal air blast thermostatic drying chamber that diversified can be used |
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| Title |
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| 沥青混合料车辙试验方法的比较分析;贾娟等;《公路》;20041130(第11期);第1.1、1.2节 * |
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