Auxiliary device for measuring asphalt adhesive force

Abstract

The utility model belongs to the technical field of road asphalt, and particularly discloses an auxiliary device for measuring asphalt adhesion, which aims to solve the technical problems in asphalt adhesion evaluation in the prior art, and comprises a detection ingot end, a cylindrical detection ingot is mounted at the bottom of the detection ingot end, and external threads are arranged on the outer circumferential surface of the cylindrical detection ingot. The cylindrical detection spindle is provided with a lantern ring, an internal thread is arranged in the lantern ring, the cylindrical detection spindle is detachably connected with the lantern ring through the thread, and a plurality of overflow gaps are uniformly distributed at the edge, close to the bottom, of the lantern ring along the circumferential direction. According to the utility model, different asphalt film thicknesses can be set by adjusting different positions of the lantern ring. The utility model has the advantages of simple structure, lower cost and higher practicability. According to the utility model, the overflow gaps are arranged at the bottom of the lantern ring at intervals, so that redundant asphalt cement can be extruded out from the overflow gaps by pressing the detection ingot forcibly in the detection process, and the accuracy of a test result is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of road asphalt, in particular to an auxiliary device for measuring the adhesion of asphalt. Background Art

[0002] Asphalt adhesion is a key factor affecting pavement durability, particularly in pavement surfaces prone to severe precipitation conditions. Loss of adhesion between the asphalt binder and aggregate particles can lead to material loosening and reduced mechanical properties. Therefore, to further understand asphalt adhesion performance, further research is needed into asphalt adhesion test methods, adhesion mechanisms, and evaluation indicators, with the goal of improving the asphalt adhesion evaluation system.

[0003] Currently, various laboratory methods have been used to evaluate and quantify asphalt-aggregate adhesion, such as the water boiling method, SHRP net adsorption method, photoelectric colorimetry, solvent elution method, etc., but these methods all have certain limitations.

[0004] The boiling method has the following issues: the slightly boiling state of the water during the test is difficult to control; the assessment is manually conducted and subject to significant subjective influence. The SHRP net adsorption method has the following issues: the test is complex, requires high standards from the test personnel, and is time-consuming. The photoelectric colorimetry method has the following issues: it requires high standards from the test personnel; the test process is long and the test results are biased. The solvent elution method has the following issues: the test is complex and time-consuming.

[0005] The pull-off test was originally used as a coating industry standard to evaluate the adhesion characteristics of the coating film to the metal interface. Later, researchers were inspired to use it in the road industry to quantitatively evaluate the adhesion between asphalt and aggregate, and it was incorporated into the standard. However, the existing technology also has the following problems:

[0006] The detection surface of the existing adhesion tester is a smooth surface. On the one hand, it is easy for the asphalt to become debonded from the detection contact surface during the test, resulting in a high inefficiency of the test results.

[0007] On the other hand, the inability to control the film thickness leads to large deviations in the results of multiple parallel tests on the same asphalt. Therefore, it is necessary to design a supporting device that can control the thickness of the asphalt film, which is particularly necessary for accurate and rapid testing of asphalt adhesion. Utility Model Content

[0008] The purpose of the utility model is to solve the technical problems existing in the prior art in the evaluation of asphalt adhesion, and to provide an auxiliary device for measuring asphalt adhesion.

[0009] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0010] An auxiliary device for measuring asphalt adhesion includes a detection spindle end, a cylindrical detection spindle is installed at the bottom of the detection spindle end, an external thread is provided on the outer circumferential surface of the cylindrical detection spindle, a collar is installed on the cylindrical detection spindle, an internal thread is provided in the collar, the cylindrical detection spindle and the collar are detachably connected by threads, and a plurality of overflow notches are evenly distributed along the circumferential direction near the bottom edge of the collar.

[0011] Furthermore, the bottom of the cylindrical testing ingot is a roughened surface.

[0012] Furthermore, the bottom of the cylindrical detection ingot is provided with annular lines.

[0013] Furthermore, an indicator line is provided on the outer circumferential surface of the cylindrical detection ingot.

[0014] Furthermore, a ring edge is provided at the bottom of the collar.

[0015] Furthermore, the overflow notches are 4 notches evenly distributed near the bottom edge of the ring.

[0016] Furthermore, the total height of the collar is 1 cm-1.2 cm, and the distance between the overflow notch and the bottom of the collar is 0.2 mm.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] This utility model utilizes a collar mounted on the outside of a cylindrical test spindle. The threaded connection between the collar and the spindle allows for adjustment of the collar's position, thereby enabling the setting of varying asphalt film thicknesses. This simple structure, low cost, and practicality are key. Overflow notches are spaced at intervals along the bottom of the collar. During testing, firm pressure on the test spindle forces excess asphalt binder out through the overflow notches, ensuring accurate test results.

[0019] The bottom of the cylindrical detection ingot of the utility model is roughened or provided with annular lines, which can increase the adhesion with asphalt. The outer circumference of the cylindrical detection ingot is provided with an indicator line, which can be used to control the thickness of the asphalt film. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is the main view of the utility model.

[0021] Figure 2 This is a schematic diagram of the structure of the detection ingot of the utility model.

[0022] Figure 3 for Figure 2 Bottom view of .

[0023] Figure 4 It is a structural diagram of the collar of the utility model.

[0024] Figure 5 For this utility model Figure 4 Bottom view of .

[0025] Figure 6 This is the experimental picture before improvement.

[0026] Figure 7 This is the improved experimental diagram.

[0027] The meanings of the accompanying figures are as follows: 1. End of detection ingot; 2. Cylindrical detection ingot; 3. Ring; 4. Overflow notch; 5. External thread; 6. Annular pattern; 7. Indicator line; 8. Internal thread; 9. Ring edge. DETAILED DESCRIPTION

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0029] like Figure 1-5 As shown, an auxiliary device for measuring asphalt adhesion comprises a detection spindle end 1, a cylindrical detection spindle 2 is mounted on the bottom of the detection spindle end 1, an external thread 5 is provided on the outer circumferential surface of the cylindrical detection spindle 2, a sleeve 3 is mounted on the cylindrical detection spindle 2, an internal thread 8 is provided in the sleeve 3, the cylindrical detection spindle 2 and the sleeve 3 are detachably connected by threads, a plurality of overflow notches 4 are evenly distributed along the circumferential direction near the bottom edge of the sleeve 3, the overflow notches 4 are 4 notches evenly distributed near the bottom edge of the sleeve 3, the distance between the overflow notch 4 and the bottom of the sleeve 3 is 0.2 mm, the total height of the sleeve 3 is 1 cm-1.2 cm, and the bottom of the cylindrical detection spindle 2 is a roughened surface or provided with an annular pattern 6.

[0030] As a further optimization solution, a ring edge 9 is provided at the bottom of the collar 3 to limit the lowest position of the cylindrical detection ingot 2 .

[0031] As a further optimization solution, an indicator line 7 may be further provided on the outer circumferential surface of the cylindrical detection ingot 2 .

[0032] When using, follow the steps below:

[0033] The drawing head (cylindrical test spindle) and the ferrule are cleaned of dust and dirt using an ultrasonic cleaning tank.

[0034] The cleaned test ingot and ring are then dried. According to the thickness required for the test, the ingot and ring are put together and the thickness is adjusted. They are then kept at a constant temperature in an oven for later use.

[0035] Heat the asphalt binder (the heating temperature of the base asphalt is 135℃, and the heating temperature of the rubber modified asphalt is 170℃) to a slightly viscous and flowable state.

[0036] After all preparatory work is in place, quickly stir the asphalt evenly with a glass rod and apply an appropriate amount of asphalt on the contact surface of the spindle; place the test spindle on the stone slab and press hard until the excess asphalt binder is squeezed out from the overflow gap 4 as much as possible.

[0037] To ensure the accuracy of the results, 3-5 groups of parallel tests were prepared for each binder.

[0038] Maintain under the maintenance conditions required for the experiment.

[0039] The sleeve of the adhesion meter is clamped with the end 1 of the detection spindle (the two are matched) to test the pull-out strength of the test piece. The pull-out rate used is 0.7MP / s. 3-5 parallel tests are carried out for each asphalt binder.

[0040] Excluding invalid tests (pulling off from the spindle and asphalt interface) and obviously abnormal data, the average of the remaining data was taken as the final test result.

[0041] The following table shows the comparative data of the pull-out test results on the same asphalt.

[0042]

Claims

1. An auxiliary device for measuring asphalt adhesion, characterized by: The invention comprises a detection ingot end head (1), a cylindrical detection ingot (2) is mounted on the bottom of the detection ingot end head (1), an external thread (5) is provided on the outer circumferential surface of the cylindrical detection ingot (2), a collar (3) is mounted on the cylindrical detection ingot (2), an internal thread (8) is provided in the collar (3), the cylindrical detection ingot (2) and the collar (3) are detachably connected via the thread, and a plurality of overflow notches (4) are uniformly distributed along the circumferential direction near the bottom edge of the collar (3).

2. The auxiliary device for measuring asphalt adhesion according to claim 1, characterized in that: The bottom of the cylindrical detection ingot (2) is a roughened surface.

3. The auxiliary device for measuring asphalt adhesion according to claim 1, characterized in that: The bottom of the cylindrical detection ingot (2) is provided with an annular pattern (6).

4. The auxiliary device for measuring asphalt adhesion according to claim 2 or 3, characterized in that: An indicator line (7) is also provided on the outer circumferential surface of the cylindrical detection ingot (2).

5. The auxiliary device for measuring asphalt adhesion according to claim 4, characterized in that: The bottom of the collar (3) is provided with a ring edge (9).

6. The auxiliary device for measuring asphalt adhesion according to claim 5, characterized in that: The overflow notches (4) are four notches evenly distributed near the bottom edge of the collar (3).

7. The auxiliary device for measuring asphalt adhesion according to claim 6, characterized in that: The total height of the collar (3) is 1 cm to 1.2 cm, and the distance between the overflow notch (4) and the bottom of the collar (3) is 0.2 mm.

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