CN111999243B - Asphalt pavement interlayer bonding performance cutting-drawing test device and evaluation method thereof - Google Patents
Asphalt pavement interlayer bonding performance cutting-drawing test device and evaluation method thereof Download PDFInfo
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- CN111999243B CN111999243B CN202010887519.1A CN202010887519A CN111999243B CN 111999243 B CN111999243 B CN 111999243B CN 202010887519 A CN202010887519 A CN 202010887519A CN 111999243 B CN111999243 B CN 111999243B
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- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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- G01N2203/0017—Tensile
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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Abstract
The invention discloses a cutting-drawing test device for interlayer bonding performance of an asphalt pavement and an evaluation method thereof, and relates to the field of measurement devices for asphalt pavement layers. The device comprises a test piece die and a horizontal force application mechanism, wherein the test piece die comprises a bottom plate, a longitudinal guide rail with a chute, a pulley block capable of moving along the horizontal direction, a test piece clamp, a transverse positioning rod and a longitudinal connecting rod, and the top end of the test piece clamp is connected with a universal testing machine through a T-shaped rod; the horizontal force application mechanism is connected with the lower part of the test piece clamp and provides horizontal tension. The device can apply horizontal force to the composite test piece in the mold without auxiliary equipment, fully simulates the pavement interlayer structure to perform a tensile strength test under a complex stress condition, realizes the interlayer bonding strength determination of the composite test piece containing the interlayer structure on the asphalt pavement based on the horizontal force, and has the advantages of simple structure, convenient use, low cost and the like.
Description
Technical Field
The invention relates to the field of measurement devices for asphalt pavement interlayer bonding performance, in particular to a cutting-drawing test device for asphalt pavement interlayer bonding performance and an evaluation method thereof.
Background
The interlayer tensile strength is an important index for evaluating the interlayer bonding performance of the asphalt pavement and is also an important evaluation index for the service performance of the asphalt pavement.
At present, a unified and effective method is not formed in the interlayer bonding characteristic test and evaluation at home and abroad, and the main evaluation means is to measure the corresponding interlayer strength index through a shear test and a drawing test. The shear test mainly evaluates the shear effect under the combined action of interlayer interface occlusion and friction resistance effect, and the pull test mainly evaluates the interlayer bonding effect. The drawing test is a common test method for evaluating the damage of an interlayer interface of the asphalt pavement under the action of vertical tension, and the direct drawing method is mainly adopted for testing the tensile bonding strength between the road surfaces at home and abroad and only the action of the vertical tension is considered. In actual conditions, under the comprehensive action of external factors such as vehicle load, environmental temperature change, freeze-thaw alternation and the like, the asphalt pavement structure is subjected to the comprehensive action of horizontal shear force and vertical tensile force between pavement layers. Especially in pavement projects of special road sections such as asphalt thin layer additional pavement, road turning, road slope sections, intersections, parking platforms and the like, the comprehensive effect of horizontal force and tensile stress applied between road surfaces is more remarkable, and the failure of an interlayer structure is accelerated.
The tensile strength between the layers of the asphalt pavement is consistent with the stress between the layers of the asphalt pavement based on the comprehensive action of the horizontal force, and the bonding characteristic between the layers under the actual stress of the pavement can be more accurately reflected. Therefore, the direct drawing test cannot accurately evaluate the interlayer bonding performance of the pavement structure, and a set of device for measuring the tensile strength between the asphalt pavement layers based on the comprehensive action of horizontal force is needed to be developed for deeply researching and analyzing the interlayer bonding characteristics of the asphalt pavement.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a cutting-drawing test device for bonding performance of an asphalt pavement interlayer under a composite stress state and an evaluation method thereof, aiming at realizing a horizontal cutting force applied during testing to perform an interlayer tensile strength test so as to comprehensively determine the bonding characteristics of the asphalt pavement interlayer under a complex stress condition.
In order to achieve the purpose of the invention, the invention adopts the technical scheme that:
a cutting-drawing test device for interlayer bonding performance of an asphalt pavement comprises a test piece die and a horizontal force application mechanism;
the test piece die comprises a bottom plate, a longitudinal guide rail with a chute, a pulley block capable of moving along the horizontal direction, a test piece clamp, a transverse positioning rod and a longitudinal connecting rod, wherein the longitudinal guide rail and the test piece clamp are both arranged on the bottom plate;
And the horizontal force application mechanism is connected with the lower part of the test piece clamp and provides horizontal tension.
The beneficial effects of the invention are: the bottom of a test piece clamp of the test device is connected with the pulley, the pulley is fixed in the guide rail, the upper part of the test piece clamp is connected with a universal testing machine, the side surface of the test piece clamp is connected with a horizontal force application mechanism, the composite test piece can move horizontally and cannot move vertically under the combined action of vertical pulling force and horizontal force, the composite test piece is pulled apart along the position between vertical layers under the action of horizontal pushing force, and therefore the test device can fully simulate the tensile strength test of a pavement interlayer structure under the complex stress condition, and can measure the interlayer bonding strength of the composite test piece containing the interlayer structure on the asphalt pavement based on the horizontal force. Meanwhile, the horizontal force application mechanism in the device can be selectively called, so that a direct drawing test and a cutting-drawing test in a composite stress state can be respectively realized, and the results of the two tests are compared.
Preferably, the longitudinal guide rail comprises an upper guide rail, a lower guide rail and a vertical column, the lower guide rail is fixed on the bottom plate, and the upper guide rail and the lower guide rail are fixed into a whole sliding groove through the vertical column.
The beneficial effects of the above preferred scheme are: the longitudinal guide rail of the device can limit the lateral movement of the test piece clamp and ensure that the test piece clamp can directionally move along the guide rail in the horizontal direction.
Preferably, the pulley block comprises a plurality of groups of pulleys installed in sliding grooves of the longitudinal guide rail, and the pulleys of each group are connected through a transverse positioning rod and move along the horizontal direction.
The beneficial effects of the above preferred scheme are: the bottom of a test piece clamp of the device is connected with a pulley, the pulley is clamped in a guide rail, the upper part of the clamp is connected with a universal testing machine, the side surface of the clamp is connected with a fixed pulley and a force application mechanism through a rope, a composite test piece can move in the horizontal direction and cannot move in the vertical direction under the comprehensive action of vertical pulling force and horizontal shearing force, and the composite test piece is pulled to be broken along the position between vertical layers under the action of the horizontal shearing force.
Preferably, a plurality of groups of bolt holes connected with the longitudinal connecting rod in a matching mode are symmetrically formed in the transverse positioning rod, a circular shaft is arranged at each of two ends of the transverse positioning rod, and the circular shafts are connected with pulleys in the pulley block respectively.
The beneficial effects of the above preferred scheme are: the horizontal positioning rod of the device is provided with a reserved adjusting screw hole, so that test pieces and clamps with different sizes can be installed.
Preferably, the two ends of the longitudinal connecting rod are respectively provided with a clamping block for fixing the transverse positioning rod downwards, the clamping block is connected with the bolt hole in the transverse positioning rod in a matching manner, and the middle part of the longitudinal connecting rod is upwards provided with a first connecting block for fixing the test piece clamp.
The beneficial effects of the above preferred scheme are: the longitudinal connecting rod of the device can realize the connection of different sizes with the transverse positioning rod through the clamping block, and the first connecting block can realize the fixed connection with the test piece clamp.
Preferably, test piece anchor clamps both sides are provided with anchor clamps and connect the side ear, and divide into upper portion anchor clamps and lower part anchor clamps, the anchor clamps of upper portion anchor clamps are connected with universal tester through T type pole to connect the side ear, lower part anchor clamps are installed on the bottom plate, and its anchor clamps connect the side ear with the connecting block of longitudinal tie rod is connected, lower part anchor clamps side still is provided with the second connecting block, install the lantern ring on the second connecting block.
The beneficial effects of the above preferred scheme are: the side lugs of the test piece clamp of the device are respectively fixed with the connecting blocks of the T-shaped rod and the longitudinal connecting rod, so that the clamp is fixedly connected in a vertical stretching mode, and the clamp can be connected with the horizontal force application mechanism through the lantern ring on the second connecting block.
Preferably, the T-shaped rod comprises a vertical pull rod and a transverse connecting rod, one end of the vertical pull rod is connected with a universal testing machine, the other end of the vertical pull rod is connected with the middle part of the transverse connecting rod, and two ends of the transverse connecting rod are respectively connected with the clamp connecting side lugs of the upper clamp in a matched mode.
The beneficial effect of above-mentioned preferred scheme is: the T-shaped rod of the device realizes the fixed connection of the clamp and the universal testing machine, and ensures the realization of the force application of vertical tension.
Preferably, horizontal force application mechanism is including connecting rope, fixed pulley and force application mechanism, the fixed pulley passes through the fixed pulley support to be fixed on the bottom plate, connect rope one end with the lantern ring of lower part anchor clamps is connected, and its other end is walked around the fixed pulley and is connected force application mechanism.
The beneficial effects of the above preferred scheme are: the horizontal force application mechanism is connected with the connecting rope which bypasses the fixed pulley, and is converted into horizontal pulling force, the horizontal pulling force is equivalently replaced by opposite horizontal shearing force, the force application mode is simple and easy to operate, the horizontal force does not need to be additionally read through a dynamometer, data reading can be realized by directly applying vertical force through weight group gravity or other force application mechanisms, the vertical pulling force is directly read at a computer end through a control system of a universal testing machine, and the data acquisition is simple and direct; the test bed can fully simulate the tensile strength test of the pavement interlayer structure under the complex stress condition, and can realize the interlayer bonding strength measurement of the composite test piece containing the interlayer structure of the asphalt pavement based on the horizontal force.
Preferably, a tray fixedly connected with the bottom plate is arranged below the bottom plate, and a cylindrical bolt fixedly connected with a lower platform of the universal testing machine is arranged at the lower part of the tray.
The beneficial effects of the above preferred scheme are: the middle bolt hole at the lower part of the bottom plate can be reformed, and the trays with the same size and different heights are added at the same position between the bottom plate and the bottom platform of the universal testing machine, so that the whole height of the device can be adjusted.
The invention also provides an evaluation method for the interlayer tensile bond strength of a pavement composite test piece containing an interlayer structure by using the test device, which comprises the following steps:
s1, manufacturing molded test pieces in multiple modes, and performing comparison verification analysis on the molded test pieces manufactured in different modes;
s2, comprehensively determining the shear threshold of the test piece based on the trial calculation of shear failure and the trial calculation of horizontal load coefficient, which specifically comprises the following steps:
s21, testing the interlayer shear strength of the composite test piece through a direct shear test, and estimating a horizontal shear force value according to the interlayer shear strength of the composite test piece to perform trial calculation based on shear failure;
s22, performing trial calculation of horizontal load coefficients according to the horizontal load effect on the road surface under different states of the vehicle;
S23, selecting the smaller value based on the shear failure trial calculation and the horizontal load coefficient trial calculation as a shear-resisting threshold value of the test piece;
s3, mounting the manufactured molded test piece on a test piece clamp, mounting the test piece clamp on a platform of a universal testing machine, connecting the test piece clamp with a horizontal force application device, setting a force application mechanism according to a shear threshold of the test piece, and finally opening the universal testing machine to perform a cutting-drawing strength loading test;
and S4, establishing an interlayer adhesion mechanical model based on a cutting-drawing test according to the test result and the test condition, and analyzing and evaluating the adhesion effect of the pavement interlayer interface.
Drawings
FIG. 1 is a schematic structural diagram of a cutting-drawing test device for bonding performance of an asphalt pavement under an interlaminar composite stress state;
FIG. 2 is a schematic view of the longitudinal rail structure of the present invention;
FIG. 3 is a schematic view of a transverse alignment rod according to the present invention;
FIG. 4 is a schematic view of the structure of the longitudinal tie bar of the present invention;
FIG. 5 is a schematic view of a specimen holder according to the present invention;
FIG. 6 is a schematic view of a T-bar configuration of the present invention;
FIG. 7 is a schematic view of the horizontal force applying device of the present invention;
FIG. 8 is a schematic flow chart of the method for evaluating the bonding performance of the asphalt pavement under the interlaminar complex stress state.
Wherein the reference numerals are: 1-vertical pull rod, 2-transverse connecting rod, 3-test piece clamp, 4-second connecting block, 5-lantern ring, 6-transverse positioning rod, 7-longitudinal connecting rod, 8-connecting rope, 9-longitudinal guide rail, 10-fixed pulley, 11-force application mechanism, 12-fixed pulley bracket, 13-pulley block, 14-upright column, 15-bottom plate, 16-bottom plate bolt hole, 17-upper guide rail, 18-lower guide rail, 19-upper clamp, 20-lower clamp, 21-clamp connecting side lug, 22-round shaft, 23-clamping block and 24-first connecting block.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
Example 1
In the prior art, when a pavement interlayer tensile strength test is carried out, the action of horizontal force is rarely considered, only a small number of researchers consider the action of the horizontal force in the test, but the applied horizontal force does not directly act on a composite test piece, the upper end and the lower end of the test piece are respectively and rigidly connected with a pull rod, the test piece limits the horizontal movement of the test piece under the action of tensile force, and the influence of the application of the horizontal force on the test piece is transferred to the pull rod. In view of the above, the invention designs a cutting-drawing test device for the bonding performance of the asphalt pavement under the interlayer composite stress state.
As shown in fig. 1, the bonding performance cut-and-pull test device provided by the embodiment of the invention under the interlayer composite stress state of the asphalt pavement comprises a test piece die and a horizontal force application mechanism;
the test piece die comprises a bottom plate 15, a longitudinal guide rail 9 with a chute, a pulley block 13 capable of moving along the horizontal direction, a test piece clamp 3, a transverse positioning rod 6 and a longitudinal connecting rod 7, wherein the longitudinal guide rail 9 and the test piece clamp 3 are both installed on the bottom plate 15, the pulley block 13 is installed in the chute of the longitudinal guide rail 9 and connected through the transverse positioning rod 6, the longitudinal connecting rod 7 is installed on the transverse positioning rod 6 and connected with the test piece clamp 3, and the top end of the test piece clamp 3 is connected with a universal testing machine through a T-shaped rod;
the horizontal force application mechanism is connected with the lower part of the test piece clamp 3 and provides horizontal tension.
As shown in fig. 1 and 2, the longitudinal guide rails 9 include an upper guide rail 17, a lower guide rail 18, and columns 14, wherein the number of the guide rails is four, and the number of the columns is six, so as to form two longitudinal guide rails 9 arranged in parallel; the lower guide rail 18 is fixed on the bottom plate 15, the upper guide rail 17 and the lower guide rail 18 are fixed into a whole sliding chute through the upright post 14, specifically, the upper guide rail 17 and the lower guide rail 18 are provided with a plurality of bolt holes, and the upright post 14 is fixedly connected with the upper guide rail 17 and the lower guide rail 18 through bolts. The longitudinal guide 9 limits the lateral displacement of the specimen holder 3 and ensures that it can be displaced in a horizontal direction in a directed manner along the guide.
As shown in fig. 1 and 2, the pulley block 13 includes a plurality of sets of pulleys mounted in the sliding grooves of the longitudinal guide rail 9, specifically, the number of the pulleys is four, and two pulleys are used as a set; the pulleys are connected through a transverse positioning rod 6, and the front pulley block 13 and the rear pulley block 13 move in the longitudinal guide rail 9 along the horizontal direction. The directional movement of the specimen holder 3 is realized by the pulley block 13.
As shown in fig. 1 and 3, a plurality of groups of bolt holes matched and connected with the longitudinal connecting rod 7 are symmetrically arranged on the transverse positioning rod 6, specifically, four bolt holes are symmetrically arranged on the transverse positioning rod 6 from left to right, the distance between the two bolt holes in the middle is 140mm, the distance between the two bolt holes on the outer side is 190mm, the bolt holes are respectively used for adapting to the longitudinal connecting rod 7 and the clamps 3 with different sizes, and the clamp sizes are 100mm and 150 mm; two ends of the transverse positioning rod 6 are respectively provided with a round shaft 22, and the round shafts 22 are respectively connected with pulleys in the pulley block 13. Through predetermineeing the regulation screw on transverse positioning pole 6, can realize the installation of not unidimensional test piece and anchor clamps.
As shown in fig. 1 and 4, two ends of the longitudinal connecting rod 7 are respectively provided with a fixture block 23 for fixing the transverse positioning rod 6 downwards, the fixture block 23 is composed of two rectangular block-shaped structures arranged in parallel, bolt holes are arranged on the rectangular block-shaped structures, the transverse positioning rod 6 is clamped between the two rectangular block-shaped structures, and the bolt holes are matched with the bolt holes on the transverse positioning rod 6 and fixedly connected through bolts. The middle part of the longitudinal connecting rod 7 is upwards provided with a first connecting block 24 for fixing the test piece clamp 3, and the first connecting block 24 is also in a rectangular block structure and is provided with a bolt hole. The longitudinal connecting rod 7 can be connected with the transverse positioning rod 6 in different sizes through the clamping block 23, and the first connecting block 24 can be fixedly connected with the test piece clamp 3.
As shown in fig. 1 and 5, clamp connection side lugs 21 are arranged on two sides of the test piece clamp 3, each clamp connection side lug 21 is composed of two rectangular block-shaped structures arranged in parallel, a plurality of bolt holes are arranged on each clamp connection side lug 21, and the test piece clamp 3 is divided into an upper clamp 19 and a lower clamp 20; the clamp connecting side lug 21 of the upper clamp 19 is connected with a universal testing machine through a T-shaped rod and used for applying vertical tension; the lower clamp 20 is arranged on the bottom plate 15, the clamp connecting side lugs 21 of the lower clamp 20 are clamped between the longitudinal connecting rods 7, bolt holes of the longitudinal connecting rods 7 are matched with bolt holes on the connecting blocks 24 of the longitudinal connecting rods 7, and the lower clamp is fixedly connected with the longitudinal connecting rods through bolts; the side of the lower clamp 20 is also provided with a second connecting block 4, and a lantern ring 5 is arranged on the second connecting block 4. The side ears 21 of the test piece clamp 3 are respectively fixed with the connecting blocks 24 of the T-shaped rod and the longitudinal connecting rod 7, the vertical stretching fixed connection of the clamp is realized, and the lantern ring 5 on the second connecting block 4 can realize the connection of the test piece clamp 3 and the horizontal force application mechanism.
As shown in fig. 1 and 6, the T-shaped rod comprises a vertical pull rod 1 and a transverse connecting rod 2, one end of the vertical pull rod 1 is connected with the universal testing machine, the other end of the vertical pull rod 1 is fixedly connected with the middle part of the transverse connecting rod 2, and two ends of the transverse connecting rod 2 are respectively matched with bolt holes on the clamp connecting side lugs 21 of the upper clamp 19 and are fixedly connected through bolts. The T-shaped rod realizes the fixed connection of the test piece clamp 3 and the universal testing machine, and the realization of the force application of vertical tension is ensured.
As shown in fig. 1 and 7, the horizontal force application mechanism includes a connecting rope 8, a fixed pulley 10 and a force application mechanism 11, the fixed pulley 10 is fixed on the edge of the bottom plate 15 through a fixed pulley bracket 12, one end of the connecting rope 8 is fixedly connected with the lantern ring 5 of the lower clamp 20, and the other end of the connecting rope 8 bypasses the fixed pulley 10 to be connected with the force application mechanism 11.
The function of the forcing mechanism 11 here is to convert the downward pulling/pressing force into a horizontal pulling force on the test piece, specifically, a weight stack or other forcing mechanism capable of applying the pulling/pressing force can be adopted; the weight is added and selected according to the required horizontal force application size, the vertical gravity of the weight is converted into the horizontal tensile force of the test piece, and the horizontal shearing force on the other side of the test piece is replaced by the equivalent tensile force. In order to ensure the accurate application of the horizontal cutting force, the small weight can be replaced by the water bag, and the accurate application of the horizontal cutting force is realized by injecting water into the water bag or pumping water.
The bottom plate bolt hole 16 in the middle of the lower part of the bottom plate can be transformed, a tray with the same size is added at the same position between the bottom plate and the platform at the bottom of the universal testing machine, the bottom plate is fixed together with the tray through bolts, and the lower part of the tray is a cylindrical bolt for being fixedly connected with the platform at the lower part of the universal testing machine. Can reform transform through the bolt hole in the middle of the bottom plate lower part, but the tray of co-ordinate size but co-altitude not increases between bottom plate and universal test machine bottom platform, realizes the adjustment to the whole height of device.
Example 2
Based on the test device, the invention also provides an evaluation method of the bond performance cut-and-pull test of the asphalt pavement under the interlayer composite stress state, as shown in fig. 8, the method comprises the following steps:
s1, manufacturing molded test pieces in multiple modes, and performing comparison verification analysis on the molded test pieces manufactured in different modes;
the method is used for forming the indoor rotary compaction composite test piece according to the standard, the diameter of the test piece is 150mm, the height of the test piece is controlled according to the requirement and the specific size of the clamp, and the height of the composite test piece in the test is 10 cm.
S2, comprehensively determining the shear threshold of the test piece based on the trial calculation of shear failure and the trial calculation of horizontal load coefficient, which specifically comprises the following steps:
s21, testing the interlayer shear strength of the composite test piece through a direct shear test, and estimating a horizontal shear force value according to the interlayer shear strength of the composite test piece to perform trial calculation based on shear failure;
the invention firstly tests the interlaminar shear strength of the composite test piece through a direct shear test, the magnitude of the shear force can be taken as being not more than 50% of the interlaminar shear strength, the aim is to ensure that the interlaminar interface of the composite test piece cannot be damaged by direct push-shear under the action of the horizontal shear force, the specific value interval can be taken from 0 to 0.5 times of the interlaminar maximum shear strength to carry out the value taking of the horizontal shear force and realize the gradient test, and the expression is as follows:
F＝(0～0.5)τ max
Wherein F is horizontal shear force, tau max The maximum interlaminar shear strength;
s22, performing trial calculation of horizontal load coefficients according to the horizontal load effect on the road surface under different states of the vehicle;
horizontal load factor, i.e. the ratio of horizontal load to vertical load. When the vehicle is in a driving, braking or braking state, the road surface is subjected to horizontal load, and the horizontal acting force can be calculated according to the following formula:
f＝μF
wherein F is horizontal load, mu is horizontal load coefficient, and F is contact pressure between the road surface and the tire;
s23, selecting the smaller value based on the trial calculation of shear failure and the trial calculation of horizontal load coefficient as the shear-resisting threshold value of the test piece;
the invention is comprehensively determined based on the two methods, and the smaller value of the trial calculation results of the two methods can be taken to ensure that the test piece is not directly damaged by shearing. Final value F Level of ＝min(F,f)。
S3, mounting the manufactured molded test piece on a test piece clamp, mounting the test piece clamp on a platform of a universal testing machine, connecting the test piece clamp with a horizontal force application device, setting a force application mechanism according to a shear threshold of the test piece, and finally opening the universal testing machine to perform a cutting-drawing strength loading test;
in order to ensure the accurate application of the horizontal cutting force, the small weight can be replaced by the water bag, and the accurate application of the horizontal cutting force is realized by injecting water into the water bag or pumping water.
According to the existing research, the interlayer shear strength of the common emulsified asphalt bonding layer at normal temperature is about 0.5MPa, and the specific value interval is 0-0.25 MPa in order to ensure that the interlayer interface of the composite test piece cannot be directly sheared off under the action of horizontal shearing force. The corresponding relation table of the shearing force and the weight mass is as follows:
TABLE 1 equivalent replacement of applied shear force and weight
And S4, establishing an interlayer adhesion mechanical model based on a cutting-drawing test according to the test result and the test condition, and analyzing and evaluating the adhesion effect of the pavement interlayer interface.
According to the test conditions, after the device is connected, the device is horizontally pre-pushed, and lubricating oil is coated on the guide rail and the pulley, so that the friction force between the pulley and the guide rail is reduced. Mounting the formed composite test piece on a clamp, and performing constant temperature control; then the clamp is integrally arranged on the device, and the upper part of the clamp is connected with the vertical pull rod; connecting a horizontal force application device, and preparing a weight group according to a trial calculation result; and finally, opening a universal testing machine to perform a cutting-drawing strength loading test. In order to ensure the accurate application of the horizontal cutting force, the small weight can be replaced by the water bag, and the accurate application of the horizontal cutting force is realized by injecting water into the water bag or pumping water.
Example 3
In this example, on the basis of example 2, the test piece molding method was changed, and the interlaminar operating characteristics of the test pieces obtained by different molding methods were compared using marshall composite test pieces and field core drilling composite test pieces. Meanwhile, on the basis, the research on the size effect is carried out, a test piece with the diameter of 100mm is used instead, a clamp with the diameter of 150mm is replaced by a clamp with the diameter of 100mm, and the change of the working characteristics among test piece layers under different sizes is analyzed.
Other operation procedures and specific technical schemes are the same as those in the embodiment 2.
Example 4
This example is based on examples 2 and 3, and the test method was changed by subtracting the horizontal force mechanism of the device and removing the connecting rope, fixed pulley and weight stack. And the direct drawing test of the test piece is realized.
Other operation flows and specific technical schemes are the same as those in the embodiment 2 and the embodiment 3.
It will be appreciated by those of ordinary skill in the art that the embodiments described herein are intended to assist the reader in understanding the principles of the invention and are to be construed as being without limitation to such specifically recited embodiments and examples. Those skilled in the art can make various other specific changes and combinations based on the teachings of the present invention without departing from the spirit of the invention, and these changes and combinations are within the scope of the invention.
Claims (6)
1. A cutting-drawing test device for the interlayer bonding performance of an asphalt pavement is characterized by comprising a test piece die and a horizontal force application mechanism;
the test piece die comprises a bottom plate (15), a longitudinal guide rail (9) with a chute, a pulley block (13) capable of moving along the horizontal direction, a test piece clamp (3), a transverse positioning rod (6) and a longitudinal connecting rod (7), wherein the longitudinal guide rail (9) and the test piece clamp (3) are both installed on the bottom plate (15), the pulley block (13) is installed in the chute of the longitudinal guide rail (9) and connected through the transverse positioning rod (6), the longitudinal connecting rod (7) is installed on the transverse positioning rod (6) and connected with the test piece clamp (3), and the top end of the test piece clamp (3) is connected with a universal testing machine through a T-shaped rod;
the longitudinal guide rail (9) comprises an upper guide rail (17), a lower guide rail (18) and an upright post (14), the lower guide rail (18) is fixed on the bottom plate (15), and the upper guide rail (17) and the lower guide rail (18) are fixed into a sliding groove whole through the upright post (14);
two ends of the longitudinal connecting rod (7) are respectively provided with a clamping block (23) for fixing the transverse positioning rod (6) downwards, the clamping blocks (23) are connected with bolt holes on the transverse positioning rods (6) in a matching manner, and the middle part of the longitudinal connecting rod (7) is upwards provided with a first connecting block (24) for fixing the test piece clamp (3);
The test piece fixture is characterized in that fixture connecting side lugs (21) are arranged on two sides of the test piece fixture (3) and are divided into an upper fixture (19) and a lower fixture (20), the fixture connecting side lugs (21) of the upper fixture (19) are connected with a universal testing machine through a T-shaped rod, the lower fixture (20) is installed on the bottom plate (15), the fixture connecting side lugs (21) of the lower fixture are connected with a first connecting block (24) of the longitudinal connecting rod (7), a second connecting block (4) is further arranged on the side face of the lower fixture (20), and a sleeve ring (5) is installed on the second connecting block (4);
the horizontal force application mechanism is connected with the lower part of the test piece clamp (3) and provides horizontal tension; horizontal force application mechanism is including connecting rope (8), fixed pulley (10) and application of force mechanism (11), fixed pulley (10) are fixed on bottom plate (15) through fixed pulley support (12), connect rope (8) one end with lantern ring (5) of lower part anchor clamps (20) are connected, and fixed pulley (10) connection application of force mechanism (11) are walked around to its other end.
2. The asphalt pavement interlayer bonding performance cut-and-pull test device according to claim 1, wherein the pulley block (13) comprises a plurality of groups of pulleys installed in sliding grooves of the longitudinal guide rail (9), and the groups of pulleys are connected through a transverse positioning rod (6) and move along a horizontal direction.
3. The asphalt pavement interlayer bonding performance cut-and-pull test device according to claim 2, wherein a plurality of groups of bolt holes matched and connected with the longitudinal connecting rod (7) are symmetrically arranged on the transverse locating rod (6), a round shaft (22) is respectively arranged at two ends of the transverse locating rod (6), and the round shafts (22) are respectively connected with pulleys in the pulley block (13).
4. The asphalt pavement interlayer bonding performance cut-and-pull test device as claimed in claim 1, wherein the T-shaped rod comprises a vertical pull rod (1) and a transverse connecting rod (2), one end of the vertical pull rod (1) is connected with a universal testing machine, the other end of the vertical pull rod is connected with the middle part of the transverse connecting rod (2), and the two ends of the transverse connecting rod (2) are respectively connected with the clamp connecting side lugs (21) of the upper clamp (19) in a matching manner.
5. The asphalt pavement interlayer bonding performance cut-and-pull test device as claimed in claim 1, wherein a tray fixedly connected with the bottom plate (15) is arranged below the bottom plate, and a cylindrical bolt fixedly connected with a lower platform of a universal tester is arranged below the tray.
6. An evaluation method using the test device according to any one of claims 1 to 5, comprising the steps of:
S1, manufacturing molded test pieces in multiple modes, and performing comparison verification analysis on the molded test pieces manufactured in different modes;
s2, comprehensively determining the shear threshold of the test piece based on the shear failure trial calculation and the horizontal load coefficient trial calculation, which specifically comprises the following steps:
s21, testing the interlayer shear strength of the composite test piece through a direct shear test, and estimating a horizontal shear force value according to the interlayer shear strength of the composite test piece to perform trial calculation based on shear failure;
s22, performing trial calculation of horizontal load coefficients according to the horizontal load effect on the road surface under different states of the vehicle;
s23, selecting the smaller value based on the trial calculation of shear failure and the trial calculation of horizontal load coefficient as the shear-resisting threshold value of the test piece;
s3, mounting the manufactured molded test piece on a test piece clamp, mounting the test piece clamp on a platform of a universal testing machine, connecting the test piece clamp with a horizontal force application device, setting the force application device according to a shear threshold of the test piece, and finally opening the universal testing machine to perform a cutting-drawing strength loading test;
and S4, establishing an interlayer adhesion mechanical model based on a cutting-drawing test according to the test result and the test condition, and analyzing and evaluating the adhesion effect of the pavement interlayer interface.
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| CN113447370B (en) * | 2021-06-24 | 2023-05-30 | 江苏省建筑工程质量检测中心有限公司 | Integral tensile and shear test system and method for precast concrete sandwich heat-insulating wallboard |
| CN114047081B (en) * | 2021-09-02 | 2024-06-11 | 宁夏大学 | Method and device for determining critical thickness of structural asphalt layer |
| CN114354486A (en) * | 2022-01-06 | 2022-04-15 | 江苏科技大学 | Device and method for testing bonding performance of geomembrane |
| CN114486505A (en) * | 2022-01-12 | 2022-05-13 | 东南大学 | Test fixture device and test method for interlayer contact parameters of pavement structure |
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| US5712431A (en) * | 1996-05-01 | 1998-01-27 | Endura-Tec Systems Corporation | Device and method for testing the shear response of a material in response to an applied force |
| CN102680329B (en) * | 2012-04-24 | 2014-03-12 | 合肥工业大学 | Drawing type soil layer shearing strength testing device and method for testing by using same |
| CN103175743A (en) * | 2013-03-13 | 2013-06-26 | 张金荣 | Multifunctional shear apparatus for asphalt pavement |
| CN103604743A (en) * | 2013-10-31 | 2014-02-26 | 青岛林川工程技术咨询有限公司 | Testing apparatus and testing method for testing interlayer connection strength of pavement layers |
| CN204514733U (en) * | 2015-04-09 | 2015-07-29 | 长安大学 | A kind of bituminous pavement right cylinder test specimen interlayer pressurization boxshear apparatus |
| CN104833576B (en) * | 2015-05-22 | 2018-09-11 | 哈尔滨工业大学 | Measure gather materials-asphalt mastic interface drawing the experimental rig and method for cutting tortuous breakdown strength under hybrid mode |
| CN106680110B (en) * | 2016-11-16 | 2023-06-20 | 河海大学 | Cement-based composite reinforced concrete interface shear test device and method |
| CN110967249A (en) * | 2019-11-13 | 2020-04-07 | 鞍钢集团矿业有限公司 | Direct shearing and drawing tester for geosynthetic material |
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