CN216208508U - Asphalt aggregate adhesion measuring device considering dynamic water pressure environment - Google Patents
Asphalt aggregate adhesion measuring device considering dynamic water pressure environment Download PDFInfo
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- CN216208508U CN216208508U CN202122643306.7U CN202122643306U CN216208508U CN 216208508 U CN216208508 U CN 216208508U CN 202122643306 U CN202122643306 U CN 202122643306U CN 216208508 U CN216208508 U CN 216208508U
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Abstract
The utility model relates to a device for measuring the adhesiveness of asphalt aggregates in consideration of dynamic water pressure environment, which comprises a constant-temperature water tank and a telescopic motor support, wherein a supporting disc is arranged in the middle of the telescopic motor support, a rotating shaft of an automatic forward and reverse rotating motor penetrates through the supporting disc and is downwards provided with a rotating blade, the automatic forward and reverse rotating motor is arranged in the center of the supporting disc, a plurality of hooks capable of automatically inducing quality are uniformly distributed on the lower surface of the supporting disc close to the edge along the circumferential direction, test aggregates are hung on each hook, and the heights of all the test aggregates after being installed are equal; the device also comprises an automatic telescopic isolation mechanism, wherein the number of the protection cylinders in the automatic telescopic isolation mechanism is consistent with that of the hooks, and each protection cylinder can isolate test aggregate on the hooks from the water environment in the constant-temperature water tank by moving up and down. The measuring device is convenient to test, simple to operate, and accurate in test result, accords with the actual road environment, and realizes quantitative measurement.
Description
Technical Field
The utility model belongs to the technical field of asphalt and aggregate adhesion testing and evaluation in highway engineering, and particularly relates to a device and a method for testing asphalt and aggregate adhesion by considering dynamic water pressure environment, which are used for testing the adhesion of asphalt and aggregate.
Background
The adhesion of asphalt and aggregate is a key factor in the design of pavement raw materials, the insufficient adhesion of asphalt and aggregate easily causes water damage such as loose asphalt pavement and pits, and pavement diseases are more easily aggravated in a rainy environment. At present, various test methods for evaluating the adhesion between coarse aggregates and asphalt are used, such as a boiling method, a water immersion method, a photoelectric colorimetry and an SHRP net adsorption method, and people generally use the two methods to represent the adhesion between asphalt and aggregates due to the simple operation of the boiling method and the water immersion method. However, the boiling method test cannot well simulate the dynamic water pressure environment actually suffered by the asphalt mixture to a certain extent by adopting boiling water flow, and the water immersion method cannot simulate the dynamic action of water in the actual pavement environment. In the existing technology for evaluating the adhesiveness by considering the dynamic water pressure environment, the dynamic water pressure environment is simulated by the unidirectional rotation stirring of the motor, and the simulation is only carried out to a certain extent, and the full consideration of the bidirectional repeated scouring process of the dynamic water pressure on the actual asphalt pavement is lacked, so that the simulation and the actual condition of the environment state of the dynamic water pressure on the asphalt mixture have certain difference in the water boiling method, the water immersion method or the existing technology for evaluating the adhesiveness between the asphalt and the aggregate by considering the dynamic water pressure environment. Neither the boiling method nor the water immersion method provides a method for quantitatively evaluating the asphalt membrane peeling rate on the aggregate surface, the adhesion evaluation is too large due to artificial subjective factors, and only one group of tests can be performed in parallel in the test process, so that the test time is long.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provide a quantitative asphalt and aggregate adhesiveness measuring device and a test method thereof, wherein the device is convenient to test, simple to operate, in line with the actual road environment and accurate in test result.
The technical scheme adopted by the utility model for solving the technical problems is as follows:
a bituminous aggregate adhesiveness measuring device considering dynamic water pressure environment comprises a constant temperature water tank and a telescopic motor support, and is characterized in that a supporting disc is arranged in the middle of the telescopic motor support, a rotating shaft of an automatic forward and reverse rotating motor penetrates through the supporting disc and is downwards provided with a rotating blade, the automatic forward and reverse rotating motor is installed in the center of the supporting disc, a plurality of hooks capable of automatically inducing quality are uniformly distributed on the lower surface of the supporting disc in the circumferential direction near the edge position, test aggregates are hung on each hook, and the heights of all the test aggregates after installation are equal; the device also comprises an automatic telescopic isolation mechanism, wherein the number of the protection cylinders in the automatic telescopic isolation mechanism is consistent with that of the hooks, and each protection cylinder can isolate test aggregate on the hooks from the water environment in the constant-temperature water tank by moving up and down.
The automatic forward and reverse rotation motor can automatically rotate forward and reverse, the forward and reverse rotation speed and frequency are adjustable, and the total cycle time is controllable.
The automatic telescopic isolation mechanism 11 comprises a protection cylinder 11-3, a telescopic rod 11-2 and a driving motor 11-1, wherein the driving motor 11-1 is arranged on the disc iron sheet, the tops of all telescopic rods 11-2 are fixedly connected into a whole through a circular iron bar, the inner side of at least one telescopic rod is provided with a clamping groove, the output shaft of the driving motor is connected with a gear, all telescopic rods 11-2 are controlled to move in the vertical height direction together through the matching of the gear and the clamping groove, the lower part of each telescopic rod 11-2 penetrates through the corresponding hole structure of the support disc and is fixedly connected with the protection cylinder 11-3, the protection cylinder can move up and down along with the telescopic rod 11-2, and the inner diameter of the protection cylinder 11-3 is larger than the diameter of test aggregate, and is far smaller than the inner diameter of the constant-temperature water tank 5.
The automatic quality induction hook can automatically detect the real-time quality of aggregate hung on the hook, and comprises a quality inductor, wherein the quality detection precision is within 0.1 g.
The quantity of couple is three, automatic flexible isolation mechanism is provided with three protection section of thick bamboo.
A test method for asphalt aggregate adhesiveness considering dynamic water pressure environment comprises the following specific steps:
(1) before the test, selecting test aggregate particles 10 with the number not more than that of hooks, and pretreating the test aggregate particles;
(2) after pretreatment, soaking all the test aggregate particles 10 in an asphalt sample to be tested together, taking out all the test aggregate particles 10 after soaking is finished, simultaneously removing the bottom constant-temperature water tank 5, lifting the telescopic motor support 2, moving the hook 6 to a certain height, binding the test aggregate particles after soaking is bound on the corresponding hooks through iron wires respectively, enabling the distances hung on the hooks after the iron wires are bound with aggregates to be equal, and demulsifying and bonding asphalt on the test aggregate particles after the asphalt is hung for 24 hours at room temperature;
(3) starting the constant temperature water tank, setting the temperature to 80 ℃, moving the constant temperature water tank 5 to the right center position of the base 1 after the temperature of the adjustable water quality 9 in the constant temperature water tank reaches 80 ℃, and supporting the telescopic motorThe frame 2 descends to enable the test aggregate hung on the hook 6 to be immersed in the constant-temperature water tank, the protective cylinder of the automatic telescopic isolation mechanism is positioned in the constant-temperature water tank at the moment, the test aggregate is not in contact with the protective cylinder, and the test aggregate is positioned above the protective cylinder at the moment; setting the positive and negative rotation period and the positive and negative rotation speed of the automatic positive and negative rotation motor 4, starting the automatic positive and negative rotation motor, starting the automatic telescopic isolation mechanism 11 at the same time, lifting a protection cylinder of the automatic telescopic isolation mechanism 11, enabling the lifting height of the protection cylinder to exceed the liquid level height in a constant temperature water tank, isolating test aggregate, and then measuring the initial mass of the test aggregate in water by a hook 6 capable of automatically sensing the mass, wherein the initial mass is respectively marked as M1-0、M2-0、…、Mn-0N is the number of test aggregates;
(4) after the initial quality of the test aggregate in water is to be tested, the automatic telescopic isolation mechanism 11 descends to the initial position, so that the test aggregate is repeatedly washed by the water flow generated by the automatic forward and reverse rotating motor 4, after the first water flow washing is finished, the automatic telescopic isolation mechanism ascends again, after the test aggregate is isolated, the hook 6 of the automatic induction quality measures the quality of the test aggregate after the test aggregate is washed for the first period, and records the quality as M1-1、M2-1、…、Mn-1；
(5) After the test is finished and the weight of the test aggregate water subjected to the water flow scouring for the first time is tested, the automatic telescopic isolation mechanism 11 descends again, so that the test aggregate is repeatedly scoured by the water flow generated by the automatic forward and reverse rotating motor 4 for the second time, after the second time of water flow scouring is finished, the automatic telescopic isolation mechanism 11 ascends again, after the test aggregate is isolated, the hook 6 of the automatic induction quality measures the water quality of the test aggregate after being scoured by the second time of water flow, and the water quality is recorded as M1-2、M2-2、…、Mn-2；
(6) Repeating the steps (4) to (5) until the test aggregate is repeatedly flushed by the water flow for T times, respectively recording the weight of the test aggregate in the water from the 1 st time to the T th time by the hooks 6 capable of automatically sensing the mass, and calculating the weight of the test aggregate in the water from the formula
The scour loss ratio of the test aggregate was calculated,the adhesiveness of the asphalt and the aggregate is judged according to the size of the scour loss ratio, and the larger the scour loss ratio is, the poorer the adhesiveness is.
Different pore pressure working conditions of light, medium and heavy vehicle tyre loads on the asphalt pavement are simulated by setting different rotating speeds; the adjustable water quality is tap water, pure water or water with certain acidity and alkalinity, and can simulate the scouring of an acid-base dynamic rainwater environment; and the T is 2-3.
The utility model also provides a test method for the adhesiveness of the asphalt aggregate considering the dynamic water pressure environment, which comprises the following specific steps:
(1) before the test, selecting test aggregate particles 10 with the number not more than that of hooks, and pretreating the test aggregate particles;
(2) after pretreatment, soaking all the test aggregate particles 10 in an asphalt sample to be tested together, taking out all the test aggregate particles 10 after soaking is finished, simultaneously removing the bottom constant-temperature water tank 5, lifting the telescopic motor support 2, moving the hook 6 to a certain height, binding the test aggregate particles after soaking is bound on the corresponding hooks through iron wires respectively, enabling the distances hung on the hooks after the iron wires are bound with aggregates to be equal, and demulsifying and bonding asphalt on the test aggregate particles after the asphalt is hung for 24 hours at room temperature;
(3) opening the constant-temperature water tank, setting the temperature to be 80 ℃, moving the constant-temperature water tank 5 to the right center position of the base 1 after the temperature of the adjustable water quality 9 in the constant-temperature water tank reaches 80 ℃, descending the telescopic motor support 2 to enable the test aggregate hung on the hook 6 to be immersed in the constant-temperature water tank, enabling the protection cylinder of the automatic telescopic isolation mechanism to be located in the constant-temperature water tank, enabling the test aggregate to be not in contact with the protection cylinder, and enabling the test aggregate to be located above the protection cylinder; setting the positive and negative rotation period and the positive and negative rotation speed of the automatic positive and negative rotation motor 4, starting the automatic positive and negative rotation motor, starting the automatic telescopic isolation mechanism 11 at the same time, lifting a protection cylinder of the automatic telescopic isolation mechanism 11, enabling the lifting height of the protection cylinder to exceed the liquid level height in a constant temperature water tank, isolating test aggregate, and then measuring the initial mass of the test aggregate in water by a hook 6 capable of automatically sensing the mass, wherein the initial mass is respectively marked as M1-0、M2-0、…、Mn-0N is the number of test aggregates;
(4) after the initial quality of the test aggregate in water is to be tested, the automatic telescopic isolation mechanism 11 descends to the initial position, so that the test aggregate is repeatedly washed by the water flow generated by the automatic forward and reverse rotating motor 4, after the first water flow washing is finished, the automatic telescopic isolation mechanism ascends again, after the test aggregate is isolated, the hook 6 of the automatic induction quality measures the quality of the test aggregate after the test aggregate is washed for the first period, and records the quality as M1-1、M2-1、…、Mn-1；
(5) After the test is finished and the weight of the test aggregate water subjected to the water flow scouring for the first time is tested, the automatic telescopic isolation mechanism 11 descends again, so that the test aggregate is repeatedly scoured by the water flow generated by the automatic forward and reverse rotating motor 4 for the second time, after the second time of water flow scouring is finished, the automatic telescopic isolation mechanism 11 ascends again, after the test aggregate is isolated, the hook 6 of the automatic induction quality measures the water quality of the test aggregate after being scoured by the second time of water flow, and the water quality is recorded as M1-2、M2-2、…、Mn-2；
(6) Repeating the steps (4) to (5) until the test aggregate is repeatedly washed by the water flow for T times, respectively recording the weight of the test aggregate in the water after the test aggregate is repeatedly washed by the water flow from the 1 st time to the T th time by the hook 6 capable of automatically sensing the quality, and when the weight of the test aggregate in the water for T times and the weight of the test aggregate in the water for T-1 times are basically unchanged, determining that the asphalt on the test aggregate is completely peeled off, judging the adhesion between the asphalt and the aggregate according to the size of T, wherein the smaller the T is, the poorer the adhesion is.
Compared with the prior art, the utility model has the beneficial effects that:
1) the measuring device adopts the motor capable of rotating forward and backward automatically, the large blade is driven by the forward and backward rotation of the automatic forward and backward rotation motor to stir the water in the constant-temperature water tank back and forth, the moving water repeatedly scouring environment suffered by the actual asphalt mixture can be simulated, the rotating speed and the forward and backward rotation time of the automatic forward and backward rotation motor can be set, the total cycle time is controllable, the different moving water repeatedly scouring environments suffered by the actual asphalt mixture can be simulated by the forward and backward rotation of the automatic forward and backward rotation motor at different rotating speeds, and the peeling effect of the water on the asphalt film is enhanced.
2) The measuring device adopts the disc iron sheet welded on the telescopic motor support, and 3 automatic telescopic isolation mechanisms which are uniformly distributed around the disc iron sheet are arranged below the disc iron sheet, so that the influence of fluctuating water flow on the weighing weight of the test aggregate fixed by the hook in water can be prevented.
3) In the device, the weight of the test aggregate in water is periodically weighed by the hook 6 capable of automatically sensing the mass, and the weight loss ratio of the test aggregate in water before and after the repeated washing of the moving water is used for realizing the quantification of the novel adhesion test result.
4) The measuring device adopts a mode of hanging the hook below the disk iron sheet, so that the distances between the hook and the center of the stirring blade are ensured to be equal, further, three test aggregates are ensured to be flushed at equal intervals by water flow vortexes formed by the middle rotating blades, and errors of parallel tests are reduced.
5) According to the test method, the automatic telescopic isolation mechanism and the hook capable of automatically sensing the quality are utilized to measure the scouring loss under different scouring times in real time for multiple times, the automatic forward and reverse rotating motor drives the blade to rotate to form forward and reverse scouring water flows, the actual bidirectional repeated scouring process of the driven water pressure of the asphalt pavement is fully considered, the proper test process can be selected according to the viscosity strength of the asphalt and the viscosity strength of an asphalt and aggregate interface, the scouring loss ratio under the maximum scouring times or the same scouring times is used as an evaluation index of the viscosity, the actual condition of application can be better fitted, and the test accuracy is higher.
6) In conclusion, the measuring device and the test method are simple in structure and convenient to operate, can simulate the hydrodynamic pressure environment borne by the actual pavement asphalt mixture to a certain extent, can test the adhesion of a group of asphalt and aggregate in batches, and can minimize human factors.
Drawings
FIG. 1 is a schematic view of the structure of an embodiment of the measuring apparatus of the present invention.
Fig. 2 is a partial structural view of the disc iron sheet 3 according to the present invention.
In fig. 1, 1 is a base; 2 is a telescopic motor bracket; 3 is a disc iron sheet; 4, an automatic positive and negative rotation motor; 5 is a constant temperature water tank; 6 is a hook; 7 is an iron wire; 8 is a rotating blade; 9 is the adjustable water quality; 10 are test aggregate particles; 11 automatic telescopic isolation mechanism.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
According to the utility model, the disk iron sheet welded on the telescopic motor support is adopted, 3 hooks uniformly distributed around the disk iron sheet are arranged below the disk iron sheet, and the 3 hooks can be used for hanging test aggregates bound by iron wires with equal length, so that the trouble of performing parallel tests for multiple times is overcome. The disc iron sheet is used for hanging test aggregate through the hook 6, certain rigidity is guaranteed, and the test aggregate is prevented from sinking due to self weight after being hung.
The automatic telescopic isolation mechanism 11 is arranged in the utility model, can move up and down along the height direction, and comprises a protection cylinder, a telescopic rod and a driving motor, wherein the protection cylinder is positioned below test aggregate in an initial state and is immersed in a constant temperature water tank; when the device is in use, the three protection cylinders are driven to move upwards through the three telescopic rods under the action of the driving motor to penetrate out the liquid level of the constant-temperature water tank, the test aggregate of the corresponding position of each protection cylinder is limited in the inner space of the protection cylinder, the protection cylinders wrap the water area, the water area space with a fixed volume is provided, the buoyancy is fixed, the fluctuation disturbance of water flow is prevented, and the quality of the test aggregate can be accurately measured in water.
Example 1
In fig. 1, the asphalt aggregate adhesiveness measuring device considering the dynamic water pressure environment in this embodiment includes a base 1, a retractable motor bracket 2, a disc iron sheet 3, an automatic forward and reverse rotation motor 4, a constant temperature water tank 5, a hook 6, an iron wire 7, a rotating blade 8, and the automatic retractable isolation mechanism 11. Adopt screw thread fastening to connect scalable motor support 2 on base 1, scalable motor support 2 wholly adopts the door frame type, two stabilizer blades of door frame can be followed upper and lower direction and stretch out and draw back, two stabilizer blades are being installed to both ends symmetry about the horizontal plane of door frame, the center of door frame horizontal plane is fixed with the welding and has disc iron sheet 3, it has three fixed couple 6 around disc iron sheet evenly distributed to weld below disc iron sheet 3, it hangs three experimental granule 10 that gathers materials that is bound by iron wire 7 to correspond below three couple 6, three iron wire guarantees that the experiment granule that gathers materials is the same at the direction of depth distance. The center of disc iron sheet 3 is passed in the pivot of automatic just reversing motor 4, and automatic just reversing motor 4's pivot lower extreme screw thread fixedly connected with rotating vane 8, and rotating vane 8 has certain rigidity, can form the shear flow, and the diameter of rotating vane 8 establishes to 60mm, can mix the water rotation in the constant temperature water tank, and can not harm sample and the automatic telescopic isolation mechanism's a protection section of thick bamboo. If the horizontal plane of the telescopic motor support is a whole continuous plane, the disc iron sheet is fixed at the center of the lower surface of the continuous plane, the automatic forward and reverse rotation motor 4 is fixed at the center of the upper surface of the continuous plane, if the horizontal plane of the telescopic motor support is a disconnected plane, the disconnected ends of the disconnected plane are welded with the disc iron sheet to form a whole, and the automatic forward and reverse rotation motor 4 can be fixed on the upper surface of the disc iron sheet 3.
The automatic telescopic isolation mechanism 11 comprises a protection barrel 11-3, telescopic rods 11-2 and a driving motor 11-1, wherein the driving motor 11-1 can be installed on a disc iron sheet, hole structures for the telescopic rods to move are uniformly arranged on the disc surface of the disc iron sheet 3 close to the edge, the driving motor 11-1 is connected with the telescopic rods 11-2, and the tops of the telescopic rods 11-2 are fixedly connected with the other two telescopic rods through circular iron bars. The gear of the driving motor 11-1 is connected with the clamping groove of the telescopic rod 11-2 to control the telescopic rod 11-2 to move along the vertical height direction, and meanwhile, the other two telescopic rods fixed through the circular iron bar are driven to move up and down together, the protection barrel 11-3 is fixed with the lower part of the telescopic rod 11-2 and can move up and down along with the telescopic rod 11-2, and the inner diameter of the protection barrel 11-3 is larger than the diameter of test aggregate and is far smaller than the inner diameter of the constant temperature water tank 5.
Still be provided with portable constant temperature water tank 5 on base 1, portable representing constant temperature water tank bottom can be dismantled the removal, treats that the aggregate erodees the end, lifts up scalable motor support 2 after, removes to the next door, be provided with the heating pipe in the constant temperature water tank, temperature sensor in addition in the constant temperature water tank, the constant temperature water tank outer wall still contains temperature controller, sets for the test temperature through temperature controller and is 80 ℃, guarantees that water boils the state a little, and 5 inner container of constant temperature water tank can be used to flourishing experiment and use adjustable quality of water 9, and the diameter of three couple place circle is not more than the diameter of constant temperature water tank inner space on the disc iron sheet.
The concrete steps of the asphalt aggregate adhesion test method considering dynamic water pressure environment in the embodiment are as follows:
(1) before the test is started, selecting three cubic basalt test aggregate particles 10 with the maximum particle size of 19.0-31.5mm, cleaning the surfaces of the cubic basalt test aggregate particles, drying the cubic basalt test aggregate particles in an oven at 110 ℃, taking the cubic basalt test aggregate particles out of the oven, cooling the cubic basalt test aggregate particles at room temperature, binding the three basalt test aggregate particles 10 with three iron wires 7 respectively, ensuring that the residual distances after the three iron wires are bound with aggregates are equal, and marking the three iron wires bound with the aggregates with labels 1, 2 and 3 respectively to ensure that the distances hung on a hook after the three iron wires are bound with the aggregates are equal.
(2) The three basalt test aggregate particles 10 were soaked together in a water-filled beaker for one minute, and after being taken out of the water-filled beaker, they were soaked together in the prepared modified emulsified asphalt for one minute. After soaking, taking out the three basalt test aggregates 10, and simultaneously removing the bottom constant-temperature water tank 5 to enable the telescopic motor support 2 to ascend, moving the hook 6 to a certain height, hanging the test aggregate particles bound by the three iron wires after soaking on the hook 6 respectively, and after hanging for 24 hours at room temperature, demulsifying and bonding the asphalt on the test aggregate particles.
(3) Starting a constant-temperature water tank, setting the temperature to be 80 ℃,after the temperature of an adjustable water quality 9 (the water quality can be tap water, pure water or water with certain acidity and alkalinity and can simulate the scouring of an acid-base power rainwater environment) in the constant-temperature water tank reaches 80 ℃, the movable constant-temperature water tank 5 is displaced to the center of the base 1, the telescopic motor support 2 descends, so that test aggregate hung on the hook 6 is immersed in the constant-temperature water tank, the protection cylinder of the automatic telescopic isolation mechanism is positioned in the constant-temperature water tank, the test aggregate is not in contact with the protection cylinder, and the test aggregate is positioned above the protection cylinder. Setting the positive and negative rotation period of an automatic positive and negative rotation motor 4 to be 3min, setting the positive and negative rotation speed to be 300r/min, starting the motor, simultaneously starting an automatic telescopic isolation mechanism 11, enabling a protection cylinder of the automatic telescopic isolation mechanism 11 to ascend, enabling the ascending height of the protection cylinder to exceed the highest liquid level of water in a constant temperature water tank, isolating test aggregate, and then measuring the initial mass of the three test aggregate in the water by a hook 6 capable of automatically sensing the mass, wherein the initial mass is respectively marked as M1-0、M2-0、M3-0。
(4) After the initial three experimental aquatic qualities of gathering materials of awaiting measuring, automatic flexible isolating mechanism 11 descends to initial position for three experimental gathers materials receive by the rivers that automatic positive reverse motor 4 generated erode repeatedly, wait that first rivers erode and end, automatic flexible isolating mechanism rises once more, after three experimental gathers materials and keeps apart, the couple 6 survey of auto-induction quality receives the aquatic quality that three experimental gathers materials after the first cycle erodees, mark as M1-1、M2-1、M3-1。
(5) After the weight of three experimental aggregates which are washed by water flow for the first time is tested, the automatic telescopic isolation mechanism 11 descends again, so that the three experimental aggregates are washed by the water flow generated by the automatic forward and reverse rotating motor 4 for the second time, after the water flow washing for the second time is finished, the automatic telescopic isolation mechanism 11 ascends again, after the three experimental aggregates are isolated, the hook 6 of the automatic induction quality measures the mass of the three experimental aggregates which are washed by the water flow for the second time, and the mass of the three experimental aggregates is recorded as M1-2、M2-2、M3-2。
(6) Repeating the steps (4) to (5) until the test aggregate is repeatedly washed by water flow for T times, and automatically sensingThe hooks 6 of the weight record the weight of the test aggregate in the water after the test aggregate is repeatedly washed by the water flow from 1 st time to T time respectively according to a formula
And (3) calculating the scouring loss ratio of the three test aggregates, and judging the adhesiveness of the asphalt and the aggregates according to the scouring loss ratio, wherein the larger the scouring loss ratio is, the worse the adhesiveness is.
Different pore pressure working conditions of light, medium and heavy vehicle tyre loads on asphalt pavements are simulated by setting different rotating speeds.
In this embodiment, T may be set to 3 times, and the adhesion test has been performed on ordinary emulsified asphalt in the early stage, and generally, the asphalt is peeled off more when the washing is performed for about 3 times, and if the washing is performed for too many times, the asphalt is peeled off from the aggregate completely, which may cause the loss ratio of the washing to lose significance.
Example 2
In this embodiment, the motor 4 is automatically rotated in forward and reverse directions, the forward and reverse rotation speed is preset to 600r/min, and the connection relationship and test procedure of the rest parts are the same as those in embodiment 1.
Example 3
In this embodiment, the motor 4 is automatically rotated in forward and reverse directions, the forward and reverse rotation speed is preset to 900r/min, and the connection relationship and test procedure of the rest parts are the same as those in embodiment 1.
Different pore pressure working conditions of light, medium and heavy vehicle tire loads on asphalt pavements are simulated by setting different rotating speeds, and it can be seen from the above example that the scouring loss ratio of the motor gradually increases along with the increase of the rotating speed of the motor, which shows that when the rotating speed of the automatic forward and reverse rotating motor increases, the scouring force of water flow on test aggregates is gradually increased, so that the scouring loss of the test aggregates is gradually increased.
Example 4
In this embodiment, the automatic forward and reverse rotation motor 4 is preset to adjust the forward and reverse rotation speed of 600r/min, and the connection relationship and test steps of the other parts are the same as those of embodiment 1, and the use steps are as follows:
(1) before the test is started, selecting three cubic basalt test aggregate particles 10 with the maximum particle size of 19.0-31.5mm, cleaning the surfaces of the cubic basalt test aggregate particles, drying the cubic basalt test aggregate particles in an oven at 110 ℃, taking the cubic basalt test aggregate particles out of the oven, cooling the cubic basalt test aggregate particles at room temperature, binding the three basalt test aggregate particles 10 with three iron wires 7 respectively, ensuring that the residual distances after the aggregate is bound by the three iron wires are equal, and labeling the three aggregate-bound iron wires with labels 1, 2 and 3 respectively.
(2) The three basalt test aggregate particles 10 were soaked together in a water-filled beaker for one minute, and after being taken out of the water-filled beaker, they were soaked together in the prepared modified emulsified asphalt for one minute. After soaking, taking out the three basalt test aggregates 10, and simultaneously removing the bottom constant-temperature water tank 5 to enable the telescopic motor support 2 to ascend, moving the hook 6 to a certain height, hanging the soaked test aggregates bound by the three iron wires on the hook 6 respectively, and after hanging the test aggregates for 24 hours at room temperature, demulsifying and bonding the asphalt on the test aggregates.
(3) Open the constant temperature water tank, the settlement temperature is 80 ℃, treat in the constant temperature water tank quality of water 9 (quality of water can be running water, pure water, or have the water of certain acid and alkali nature, can simulate the washing away of acid and alkali power rainwater environment.) after the temperature reaches 80 ℃, move portable constant temperature water tank 5 and shift base 1 positive central point and put, scalable motor support 2 descends for the experimental collection materials that hang on the couple 6 immerse in the constant temperature water tank, and the protection section of thick bamboo of automatic flexible isolating mechanism 11 is located the constant temperature water tank water during the initial time, and is far less than experimental collection materials, and the two are contactless. Setting the positive and negative rotation period of the automatic positive and negative rotation motor 4 to be 3min, setting the positive and negative rotation speed to be 300r/min, starting, simultaneously raising the automatic telescopic isolation mechanism 11 to isolate test aggregate, wherein the protection cylinder of the automatic telescopic isolation mechanism 11 exceeds the liquid level of the constant-temperature water tank, then measuring the initial mass of the three test aggregates in water by the hook 6 capable of automatically sensing the mass, and respectively recording the initial mass as M1-0、M2-0、M3-0。
(4) After the initial three tests of the weight of the aggregate water to be tested are finished, the automatic telescopic isolation mechanism 11 descends to enable three test aggregates to be repeatedly washed by water flow generated by an automatic positive and negative rotating motor 4, after the first water flow washing is finished, an automatic telescopic isolation mechanism 11 ascends again, after the three test aggregates are isolated, the hook 6 of the automatic induction quality measures the water quality of the three test aggregates after being washed by the first period, and records the water quality as M1-1、M2-1、M3-1。
(5) After the weight of three experimental aggregates which are washed by water flow for the first time is tested, the automatic telescopic isolation mechanism 11 descends again, so that the three experimental aggregates are washed by the water flow generated by the automatic forward and reverse rotating motor 4 for the second time, after the water flow washing for the second time is finished, the automatic telescopic isolation mechanism 11 ascends again, after the three experimental aggregates are isolated, the hook 6 of the automatic induction quality measures the mass of the three experimental aggregates which are washed by the water flow for the second time, and the mass of the three experimental aggregates is recorded as M1-2、M2-3、M3-3。
(6) Repeating the steps (4) to (5) until the test aggregate is repeatedly washed by the water flow for T times, respectively recording the weight of the test aggregate in the water after the test aggregate is repeatedly washed by the water flow from the 1 st time to the T th time by the hook 6 capable of automatically sensing the quality, and when the weight of the test aggregate in the water for T times and the weight of the test aggregate in the water for T-1 times are basically unchanged, determining that the asphalt on the test aggregate is completely peeled off, judging the adhesion between the asphalt and the aggregate according to the size of T, wherein the smaller the T is, the poorer the adhesion is.
The difference from the embodiments 1, 2 and 3 is that the present embodiment determines the adhesion between asphalt and aggregate by testing the number of times of washing corresponding to the complete stripping of the aggregate, and it can be seen from the above that the number of times of washing required for the complete stripping of the epoxy emulsified asphalt from the aggregate is much greater than that of the ordinary emulsified asphalt, which indicates that the adhesion of the epoxy emulsified asphalt is better than that of the ordinary emulsified asphalt.
Through two different experimental modes of example 4 and example 1, whether the viscosity action of asphalt or the viscosity action of the interface between asphalt and aggregate is the main influence between asphalt and aggregate can be researched, and a selective and targeted experiment can be given for actual materials, so that the reliability is higher.
It will be understood that variations or modifications derived or suggested to one skilled in the art from the disclosure and common general knowledge in the art, which achieve the same function and effect as those described in the present patent, may be made without departing from the scope of the utility model as defined in the appended claims.
Nothing in this specification is said to apply to the prior art.
Claims (6)
1. A bituminous aggregate adhesiveness measuring device considering dynamic water pressure environment comprises a constant temperature water tank and a telescopic motor support, and is characterized in that a supporting disc is arranged in the middle of the telescopic motor support, a rotating shaft of an automatic forward and reverse rotating motor penetrates through the supporting disc and is downwards provided with a rotating blade, the automatic forward and reverse rotating motor is installed in the center of the supporting disc, a plurality of hooks capable of automatically inducing quality are uniformly distributed on the lower surface of the supporting disc in the circumferential direction near the edge position, test aggregates are hung on the hooks, and the heights of all the test aggregates after installation are equal; the device also comprises an automatic telescopic isolation mechanism.
2. The measuring apparatus according to claim 1, wherein the automatic forward/reverse rotation motor is capable of automatic forward/reverse rotation, and has adjustable forward/reverse rotation speed and frequency, and controllable total cycle time.
3. The measuring device according to claim 1, wherein the supporting disk is a disk iron sheet, the edge of the disk surface of the supporting disk and the outer side of the hook are provided with a hole structure, the automatic telescopic isolation mechanism comprises a protection cylinder, telescopic rods and a driving motor, the driving motor is installed on the disk iron sheet, the tops of all the telescopic rods are fixedly connected through a circular iron bar to form a whole, the inner side of at least one telescopic rod is provided with a clamping groove, an output shaft of the driving motor is connected with a gear, the gear and the clamping groove are matched to control all the telescopic rods to move together along the vertical height direction, the lower portion of each telescopic rod penetrates through the corresponding hole structure of the supporting disk and is fixedly connected with the protection cylinder, the protection cylinder can move up and down along with the telescopic rod, the inner diameter of the protection cylinder is larger than that of test aggregate, and is far smaller than the inner diameter of the constant temperature water tank.
4. The apparatus according to claim 1, wherein the hook for automatically sensing the mass is capable of automatically detecting the real-time mass of the aggregate suspended on the hook, and comprises a mass sensor with a mass detection accuracy of 0.1g or less.
5. The measuring apparatus according to claim 1, wherein the number of the hooks is three, and the automatic telescopic isolation mechanism is provided with three protective cylinders.
6. The apparatus according to claim 1, wherein the automatic telescopic isolation mechanism can isolate the test aggregate on the hook from the water environment in the constant temperature water tank by moving up and down.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116061455A (en) * | 2023-04-06 | 2023-05-05 | 喜跃发国际环保新材料股份有限公司 | Processing technology and processing system of net crack paste |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116061455A (en) * | 2023-04-06 | 2023-05-05 | 喜跃发国际环保新材料股份有限公司 | Processing technology and processing system of net crack paste |
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