Equipment for evaluating adhesive strength of recycled asphalt mixture adhesive cement

Abstract

A device for evaluating the adhesive strength of recycled asphalt mixture adhesive cement comprises a base, the base is provided with a heating clamping module located on the lower portion and a linear driving module located on the upper portion in the same vertical axis direction, the heating clamping module is detachably connected with a test piece base, and the linear driving module is detachably connected with the test piece base. The linear driving module is provided with a driving main shaft capable of vertically reciprocating, the driving main shaft is provided with a displacement sensor and a tension sensor, the driving main shaft is detachably connected with a test piece upper cover, and the heating clamping module is provided with a hot water inlet and a cold water outlet. The equipment for evaluating the adhesive strength of the recycled asphalt mixture provided by the utility model can conveniently adapt to tests of test pieces with different structures by replacing accessories, can flexibly adjust the temperature of the test pieces according to the evaluation test requirements, simultaneously obtains continuous real-time data of tensile force and displacement borne by the test pieces in the whole process, and improves the test efficiency. Therefore, evaluation data of the bonding strength of the recycled asphalt mixture adhesive cement can be well completed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of highway maintenance, and specifically relates to a device for evaluating and measuring the bonding strength of recycled asphalt mixture mortar. BACKGROUND

[0002] In recycled asphalt mixture, the surface of aggregate is wrapped by a layer of recycled asphalt mortar film, and the actual bonding role in recycled asphalt mixture is recycled asphalt mortar, not single recycled asphalt. The interface system formed by the adhesion of recycled asphalt mortar-aggregate is a weak structural area in recycled asphalt mixture, and the failure of asphalt mixture usually occurs in the interior of asphalt mortar and the interface between asphalt mortar and aggregate, and if the bonding at the interface is weak, early damage of asphalt pavement will be caused.

[0003] Recycled asphalt mixture mortar is mainly composed of new and old asphalt and new and old aggregate, and under normal circumstances, the performance of new asphalt and new aggregate is good, but RAP has diversity in performance due to differences in source, material composition, aging degree and processing treatment. RAP has the following states: (1) RAP not wrapped by old asphalt; (2) RAP partially wrapped by old asphalt; (3) RAP completely wrapped by old asphalt, appearing black or dark brown, referred to as "black stone"; (4) old asphalt lump peeled off from coarse aggregate. The various states of RAP lead to the formation of various mortars when mixed with new asphalt and aggregate, and the bonding strength of the mortars is also quite different, so it is necessary to evaluate and measure the bonding strength of the mortars during product research and development or production.

[0004] The existing evaluation and measurement work is usually implemented by using a universal testing machine or a pull-off tester. The commonly used universal testing machine has many functions, so it may need to frequently change testing instruments when performing pull-off tests, and the operation is relatively cumbersome. The commercially available pull-off tester can only perform single-temperature tests, and can only display the maximum pull-off value, and cannot reflect the force value change of asphalt mortar during the entire pull-off action. In addition, since the mortar test piece is prepared by plastic cold solidification of paste-shaped material at high temperature through a mold into a rigid body, the shape of the test piece can only be prepared according to the existing universal testing machine or pull-off tester, for example, only a commonly used cylindrical structure can be prepared, and in some cases, the data of test pieces with other shapes (such as cuboid structure or triangular prism structure) may be needed, and the existing test equipment is difficult to meet the needs. UTILITY MODEL CONTENTS

[0005] The technical problem to be solved by the utility model is to provide a device for evaluating the bonding strength of recycled asphalt mixture mortar to solve the above-mentioned problems.

[0006] The utility model provides a kind of equipment for evaluating the bonding strength of recycled asphalt mixture glue, it includes a pedestal, the pedestal is provided with heating clamping module located below and linear drive module located above in same vertical axis direction, the heating clamping module is detachably connected with test piece base, the linear drive module is provided with the driving main shaft that can vertically reciprocate, the driving main shaft is provided with displacement sensor and tension sensor, the driving main shaft is detachably connected with test piece upper cover, the heating clamping module is provided with hot water inlet and cold water outlet.

[0007] Preferably, the test piece upper cover includes a cover body and a sleeve, the sleeve is provided with symmetrical connecting grooves, the driving main shaft is provided with pin holes corresponding to the connecting grooves, and the test piece upper cover is detachably connected with the driving main shaft through a pin.

[0008] Preferably, the heating clamping module includes a box body and a metal cover plate, the test piece base includes a U-shaped base and a connecting rod, and the connecting rod is detachably connected with the metal cover plate through threads.

[0009] Preferably, the box body is made of resin-based non-metallic material, and the metal cover plate is sealingly connected with the box body through adhesion.

[0010] Preferably, the box body is fixedly connected with the pedestal through adhesion.

[0011] Preferably, the metal cover plate is provided with an ear, and the metal cover plate is detachably connected with the pedestal through bolts.

[0012] Preferably, a glass cover is arranged between the linear drive module and the metal cover plate.

[0013] Preferably, the test piece upper cover and the test piece base are both made of metal material, and the skirt of the cover body and the U-shaped base has a height of 3-6 mm.

[0014] The equipment for evaluating the bonding strength of recycled asphalt mixture glue can conveniently adapt to the test of test pieces with different structures by replacing accessories, and can flexibly adjust the temperature of test pieces according to the needs of evaluation test, while continuously obtaining real-time data of the tension and displacement of test pieces throughout the test, so that the evaluation data of the bonding strength of recycled asphalt mixture glue can be well completed. BRIEF DESCRIPTION OF DRAWINGS

[0015] The following drawings are only intended to schematically illustrate and explain the utility model, and do not limit the scope of the utility model. Among them,

[0016] Figure 1A structural principle schematic view of a device for evaluating the adhesive strength of reclaimed asphalt mixture glue according to one specific embodiment of the present application;

[0017] Figure 2 A structural principle schematic view of a device for evaluating the adhesive strength of reclaimed asphalt mixture glue according to one specific embodiment of the present application; Figure 1 A structural principle schematic view of a device for evaluating the adhesive strength of reclaimed asphalt mixture glue according to one specific embodiment of the present application;

[0018] Figure 3 A structural principle schematic view of a device for evaluating the adhesive strength of reclaimed asphalt mixture glue according to one specific embodiment of the present application; Figure 2 A partial exploded structural principle schematic view of a driving main shaft and a specimen upper cover of a device for evaluating the adhesive strength of reclaimed asphalt mixture glue according to one specific embodiment of the present application;

[0019] Figure 4 A partial exploded structural principle schematic view of a driving main shaft and a specimen upper cover of a device for evaluating the adhesive strength of reclaimed asphalt mixture glue according to one specific embodiment of the present application; Figure 2 A sectional view structural principle schematic view of a connection state of a heating clamping module and a specimen base of a device for evaluating the adhesive strength of reclaimed asphalt mixture glue according to one specific embodiment of the present application. DETAILED DESCRIPTION

[0020] In order to have a clearer understanding of the technical features, objects and effects of the present application, the specific embodiments of the present application will be described with reference to the drawings. Identical components are denoted by identical reference numerals.

[0021] Figure 1 A structural principle schematic view of a device for evaluating the adhesive strength of reclaimed asphalt mixture glue according to one specific embodiment of the present application; Figure 2 A structural principle schematic view of a device for evaluating the adhesive strength of reclaimed asphalt mixture glue according to one specific embodiment of the present application; Figure 1 A structural principle schematic view of a device for evaluating the adhesive strength of reclaimed asphalt mixture glue according to one specific embodiment of the present application; Figure 1 A structural principle schematic view of a device for evaluating the adhesive strength of reclaimed asphalt mixture glue according to one specific embodiment of the present application; Figure 2 The present application provides a device for evaluating the adhesive strength of reclaimed asphalt mixture glue, which comprises a base 1, wherein the base 1 is provided with a heating clamping module 2 located at the lower part and a linear driving module 3 located at the upper part in the same vertical axis direction, the heating clamping module 2 is detachably connected with a specimen base 4, the linear driving module 3 is provided with a driving main shaft 31 capable of vertically reciprocating, the driving main shaft 31 is provided with a displacement sensor (not shown in the figure) and a tension sensor (not shown in the figure), the driving main shaft 31 is detachably connected with a specimen upper cover 5, and the heating clamping module 2 is provided with a hot water inlet 21 and a cold water outlet 22.

[0022] Figure 3 A partial exploded structural principle schematic view of a driving main shaft and a specimen upper cover of a device for evaluating the adhesive strength of reclaimed asphalt mixture glue according to one specific embodiment of the present application; Figure 2 A partial exploded structural principle schematic view of a driving main shaft and a specimen upper cover of a device for evaluating the adhesive strength of reclaimed asphalt mixture glue according to one specific embodiment of the present application; Figure 3 The specimen upper cover 5 comprises a cover body 51 and a sleeve 52, the sleeve 52 is provided with symmetrical connecting grooves 521, the driving main shaft 31 is provided with pin holes 311 corresponding to the connecting grooves 521, and the specimen upper cover 5 and the driving main shaft 31 can be detachably connected through a pin (not shown in the figure).

[0023] Figure 4for Figure 2 A cross-sectional structural diagram showing the connection between the heating clamping module and the specimen base, see [reference]. Figure 4 As shown, the heating clamping module 2 includes a housing 23 and a metal cover plate 24. The specimen base 4 includes a U-shaped base 41 and a connecting rod 42. The connecting rod 42 is detachably connected to the metal cover plate 24 via threads. The housing 23 can be made of a resin-based non-metallic material with good heat insulation properties. The metal cover plate 24 can be sealed to the housing 23 by adhesive bonding. Alternatively, the housing 23 can be fixedly connected to the base 1 by adhesive bonding, which has the advantage of a simpler structure. Of course, the housing 23 can also be not fixedly connected to the base 1. Instead, lugs (not shown in the figure) can be provided on the metal cover plate 24, and the metal cover plate 24 can be detachably connected to the base 1 via bolts through the lugs. This allows for easier removal of the housing 23 during maintenance.

[0024] See Figure 3 and Figure 4The working principle of the device for evaluating the adhesive strength of reclaimed asphalt mixture mortar provided by the utility model can be that the base 1 provides an overall structural assembly space, the linear driving module 3 can be a commercially available direct current motor or alternating current motor as long as it can provide sufficient vertical force, when it is necessary to evaluate the fresh asphalt mixture mortar, the test piece base 4 and the test piece upper cover 5 can be integrally prepared with the paste used for preparing the mortar test piece through a mold at the same time, so that the connection strength of the test piece and the test piece base 4 and the test piece upper cover 5 can be ensured, after the test piece is solidified and formed, the test piece can be fixed on the metal cover plate 24 as a whole by rotating the test piece and using the connecting rod 42, then the driving main shaft 31 of the linear driving module 3 is lowered and inserted into the sleeve 52, then the driving main shaft 31 and the sleeve 52 are fixedly connected through the pin (not shown in the figure). Then the hot water inlet 21 and the cold water outlet 22 are connected with the constant temperature water bath box, so that the water source at the set temperature in the constant temperature water bath box can be continuously input into the box body 23 through the water pump (not shown in the figure), so that the test piece can be heated through the test piece base 4 and the metal cover plate 24, so that the test piece can reach the required temperature for evaluation. Considering that the positions of the linear driving module 3 and the metal cover plate 24 are relatively fixed, a glass cover or a cloth curtain or the like can be arranged between the linear driving module 3 and the metal cover plate 24, so that the heat conducted by the metal cover plate 24 can be better conducted to the test piece. In order to monitor the temperature of the test piece, temperature sensors (not shown in the figure) can be arranged at the cold water outlet 22 and the driving main shaft 31, so that when the temperatures measured by the two temperature sensors are consistent or the deviation is only about 5%, it can be considered that the test piece has reached the expected temperature.

[0025] After the test piece reaches the expected temperature, the linear driving module 3 can be driven, and the displacement sensor can be zeroed according to the monitoring value of the tension sensor, so that the influence of the gap between the connection parts on the measurement data of the displacement sensor can be avoided. After the zeroing operation is completed, the test piece can be pulled out for evaluation, and continuous real-time data of the tension and displacement of the test piece can be obtained.

[0026] Referring to Figure 3 and Figure 4As shown, the test piece upper cover 5 and the test piece base 4 can be made of metal material (for example, stainless steel), and the skirt of the cover body 51 and the U-shaped base 41 can have a height of 3-6 mm, which can maintain the clamping force with the formed test piece during the preparation of the test piece, and facilitate the cleaning of the material after the evaluation test is completed. In addition, as described in the background, due to the limitation of the shape of the test piece for the existing commercially available test equipment, in the technical solution of the present application, different cross-sectional shapes of the column can be prepared by replacing the test piece upper cover 5 and the test piece base 4 with different cross-sectional shapes, thereby effectively overcoming the defects of the existing equipment. That is, since the test piece upper cover 5 and the test piece base 4 are detachably connected, only the cover body 51 and the U-shaped base 41 with different shapes need to be selected to prepare test pieces with different structures.

[0027] When it is necessary to test the bonding force of the test piece with different material substrates, for example, it is necessary to test the bonding force with the concrete base material, the corresponding shape of the concrete base material can be bonded on the metal prepared cover body 51 and U-shaped base 41, and then the paste used to prepare the mortar test piece is integrally formed through the mold during the preparation of the test piece.

[0028] The device for evaluating the bonding strength of the recycled asphalt mixture mortar provided by the present application can conveniently adapt to the test of test pieces with different structures by replacing accessories, and can flexibly adjust the temperature of the test piece according to the needs of the evaluation test, and continuously obtains the real-time data of the tension and displacement of the test piece, so that the evaluation data of the bonding strength of the recycled asphalt mixture mortar can be well completed.

[0029] Those skilled in the art should understand that although the present application is described in the form of multiple embodiments, not every embodiment contains only one independent technical solution. The description in the specification is only for the sake of clarity, those skilled in the art should understand the specification as a whole, and the technical solutions involved in each embodiment should be understood as a way of combining different embodiments to understand the protection scope of the present application.

[0030] The above is only a specific embodiment of the present application, and is not intended to limit the scope of the present application. Any equivalent changes, modifications and combinations made by those skilled in the art without departing from the concept and principles of the present application shall fall within the scope of the present application.

Claims

1. An apparatus for evaluating the cohesive strength of a recycled asphalt mixture mortar, characterized by, It includes a base, the base is provided with heating clamping module below and linear drive module above in the same vertical axis direction, the heating clamping module is detachably connected with test piece base, the linear drive module is provided with driving main shaft that can vertically reciprocate, the driving main shaft is provided with displacement sensor and tension sensor, the driving main shaft is detachably connected with test piece upper cover, the heating clamping module is provided with hot water inlet and cold water outlet.

2. The apparatus for evaluating the cohesive strength of a reclaimed asphalt mixture gum according to claim 1, characterized by, The test piece upper cover includes a cover body and a sleeve, the sleeve is provided with symmetrical connecting grooves, the driving main shaft is provided with pin holes corresponding to the connecting grooves, and the test piece upper cover is detachably connected with the driving main shaft through the pin.

3. The apparatus for evaluating the cohesive strength of a reclaimed asphalt mixture gum according to claim 2, characterized by, The heating clamping module includes a box body and a metal cover plate, the test piece base includes a U-shaped base and a connecting rod, and the connecting rod is detachably connected with the metal cover plate through threads.

4. The apparatus for evaluating the cohesive strength of a reclaimed asphalt mixture gum according to claim 3, characterized by, The box body is made of resin non-metallic material, and the metal cover plate is sealingly connected with the box body through bonding.

5. The apparatus for evaluating the cohesive strength of a reclaimed asphalt mixture gum according to claim 4, characterized by, The box body is fixedly connected with the base through bonding.

6. The apparatus for evaluating the cohesive strength of a reclaimed asphalt mixture gum according to claim 4, characterized by, The metal cover plate is provided with an ear, and the metal cover plate is detachably connected with the base through bolts.

7. The apparatus for evaluating the cohesive strength of a reclaimed asphalt mixture gum according to claim 3, characterized by, A glass cover is arranged between the linear drive module and the metal cover plate.

8. The apparatus for evaluating the cohesive strength of a reclaimed asphalt mixture gum according to claim 3, characterized by, The test piece upper cover and the test piece base are made of metal material, and the skirt of the cover body and the U-shaped base has a height of 3-6 mm.

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