CN111175111B - Clamp for shear test of asphalt concrete contact test piece and test method thereof - Google Patents
Clamp for shear test of asphalt concrete contact test piece and test method thereof Download PDFInfo
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- CN111175111B CN111175111B CN202010135563.7A CN202010135563A CN111175111B CN 111175111 B CN111175111 B CN 111175111B CN 202010135563 A CN202010135563 A CN 202010135563A CN 111175111 B CN111175111 B CN 111175111B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01N3/02—Details
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01N3/22—Investigating strength properties of solid materials by application of mechanical stress by applying steady torsional forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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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Abstract
An asphalt concrete contact test piece, a manufacturing method thereof and a clamp for a shear test of the asphalt concrete contact test piece comprise: an asphalt sample to be tested and an adhesion rod; the number of the adhesion rods is 2; the 2 adhesion rods are coaxially and oppositely arranged; the pitch sample that awaits measuring sets up on 2 the solid material clearance of the adjacent bonding tip of adhesion stick. The first embodiment that this application provided can control the ratio of pitch and adhesion, can simulate asphalt concrete's oilstone ratio, can accurately simulate out the contact mechanics characteristic between pitch and the adhesion to lay reliable basis for asphalt concrete's mechanical properties research.
Description
Technical Field
The invention relates to a contact test piece, in particular to an asphalt concrete contact test piece, belonging to the technical field of road construction; the invention also provides a method for manufacturing the asphalt concrete contact test piece and a clamp for the shear test of the asphalt concrete contact test piece.
Background
Asphalt concrete is an indispensable pavement material for highways and urban roads, but the pavement performance and durability of asphalt concrete are limited by diseases such as fatigue cracking and rutting deformation of asphalt concrete. In order to deeply explore the microscopic evolution process of the diseases and reduce the influence of the diseases on the pavement performance, the discrete element numerical experiment method is very suitable for the disease mechanism research of the complex granular mixture material of asphalt concrete. When the discrete element simulation of the asphalt mixture is carried out, the mesoscopic parameters of the discrete elements cannot be directly obtained according to the test and are usually obtained by repeated calculation, namely, a series of parameters are assumed to carry out numerical simulation, and if the macroscopic mechanical response of the model is similar to the actual test, the parameters can be used as the calculation parameters of the discrete element model. The rationality of the mesoscopic parameters obtained in this way cannot be determined, which is not favorable for the disclosure of the mesoscopic mechanism. At present, a few foreign scholars try to quantitatively describe the cementation between soil particles by a model test method. The strength indicators of the cement between the aluminium bars under tension, compression, shear and torsion are determined by a series of simple loading tests on two aluminium bars cemented with epoxy resin, as in the french, delenone et al (2004), and these strength indicators are subsequently introduced into a discrete element contact model to simulate the mechanical properties of the structural sand.
The existing numerical experiment method based on discrete elements has obvious advantages in analyzing and researching discontinuous deformation of the diseases and the like, and can provide visual, repeatable and quantifiable numerical experiments for researching the internal mechanism of the diseases. In order to make the numerical experiment closer to the actual situation, the contact mechanics problem among the asphalt concrete aggregate particles, namely the particle contact constitutive relation, needs to be intensively researched. However, in the prior art, the test piece for researching the mechanical properties of the contact of the asphalt concrete cannot meet the requirement for researching the mechanical properties of the contact of the microscopic asphalt and the concrete aggregate.
Therefore, the technical problem to be solved by the technical staff in the art is to provide an asphalt concrete contact test piece which can simulate the mechanical property between asphalt and an adhesive and improve the accuracy of asphalt concrete performance research.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to connect the asphalt and the end part of the adhesion rod, can control the ratio of the asphalt to the adhesion, can simulate the oilstone ratio of asphalt concrete, and can accurately simulate the contact mechanical property between the asphalt and the adhesion, thereby laying a reliable foundation for the mechanical property research of the asphalt concrete. The invention provides an asphalt concrete contact test piece, which comprises: an asphalt sample to be tested and an adhesion rod; the number of the adhesion rods is 2; the 2 adhesion rods are coaxially and oppositely arranged; the pitch sample that awaits measuring sets up on 2 the solid material clearance of the adjacent bonding tip of adhesion stick.
According to a first embodiment of the present application, there is provided an asphalt concrete contact specimen:
an asphalt concrete contact specimen, comprising: an asphalt sample to be tested and an adhesion rod; the number of the adhesion rods is 2; the 2 adhesion rods are coaxially and oppositely arranged; the pitch sample that awaits measuring sets up on 2 the solid material clearance of the adjacent bonding tip of adhesion stick.
Preferably, the bonded end is spherical.
Preferably, the adhesive rod is a cylindrical body.
Preferably, the diameter A of the adhesion rod is 10-100mm, preferably A is 15-50 mm; more preferably A is 20-30 mm.
Preferably, the asphalt sample to be measured is adhered to the bonding end in a cylindrical shape.
Preferably, the asphalt sample to be detected is asphalt mortar to be detected.
Preferably, the diameter B of the to-be-detected asphalt sample cylinder is 0.1-1.2A; preferably B is 0.3-0.8A; more preferably, B is 0.5-0.6A.
Preferably, the size C of the solid material gap is 0.1-1.2B; preferably C is 0.3-0.8B; more preferably, C is 0.5-0.6B.
Preferably, the adhesive rod is a stone rod; preferably a basalt stone rod.
Preferably, the length D of the adhesion rod is 20-300 mm; preferably D is 35-200 mm; more preferably D is 50-100 mm.
According to a second embodiment of the present application, there is provided a clamp for shear testing of an asphalt concrete contact specimen of the first embodiment
A clamp for shear testing of an asphalt concrete contact specimen of the first embodiment, comprising: an adhesive rod sleeving and clamping mechanism; the number of the adhesion rod sleeving and clamping mechanisms is two; one adhesion rod sleeving and clamping mechanism is sleeved and clamped on an adhesion rod on one side of the asphalt concrete contact test piece, and the other adhesion rod sleeving and clamping mechanism is sleeved and clamped on an adhesion rod on the other side of the asphalt concrete contact test piece; the moving direction of the 2 adhesion rod sleeve clamp mechanisms is perpendicular to the axis of the asphalt concrete contact test piece, the external force borne by the 2 adhesion rod sleeve clamp mechanisms is on the same action line, and the action line penetrates through the center of the asphalt sample to be tested.
Preferably, the adhesion rod sheathing mechanism includes: the clamp comprises a clamp base plate, a pull head, a rod sleeving part, a sleeving hole, a stop plate and a stop bolt; the pull head is arranged at one end of the clamp base plate, and the rod sleeving part is arranged at the other end of the clamp base plate; the puller is columnar, the sleeve rod parts of the 2 adhesive rod sleeve clamping mechanisms are mutually attached, and the plane formed by the attachment coincides with the axis of the puller; the trepanning is arranged on the rod sleeving part and is used for sleeving and clamping the adhesion rod; the trepanning of the 2 sticking rod sheathing and clamping mechanisms are coaxial, and the axis of the trepanning is vertical to the plane formed by the 2 sticking rod parts; one end of the stop plate is arranged on the outer edge of the clamp base plate, a stop bolt for adjusting the position of the adhesion rod is arranged at the other end of the stop plate, and the stop bolt is abutted against the tail part, far away from the bonding end part, of the adhesion rod.
According to a third embodiment of the present application, there is provided a method of making the asphalt concrete contact specimen of the first embodiment:
a method of making a first embodiment asphalt concrete contact specimen, the method comprising the steps of:
1) fixing an adhesion rod: the bonding end parts of the 2 bonding rods are oppositely arranged at the matching concave pits at the two ends of the prefabricated mud core; the adhesion rods are coaxially arranged;
2) pouring asphalt: and pouring asphalt mortar into the inner cavity of the prefabricated core through the pouring opening above the prefabricated core, solidifying the asphalt mortar in the inner cavity, and adhering the asphalt mortar to the bonding end part to form the asphalt sample to be tested.
Preferably, in the step 1), the method for manufacturing the precast loam core comprises the following steps:
1a) constructing a prefabricated loam core manufacturing mold: the bonding end parts of the 2 bonding rods are horizontally and oppositely arranged on the lower die component, the bonding rods are coaxially arranged, the parts of the bonding rods below the axis are embedded into the grooves of the lower die component, and the end part of one bonding rod extends out of the asphalt cavity structure rod along the axis and is embedded into the end part of the other bonding rod; the upper die component is covered above the bonding end part, and the upper die component and the lower die component form a cylindrical loam core die cavity coaxial with the bonding rod; filling soil into the cavity of the sand core mold to form a sand core, wherein the space occupied by the bonding end part of the sand core is a matching pit;
1b) constructing a pouring opening of the prefabricated loam core: a hole is formed in the upper die component, a burning core is inserted, and the end part of the pouring core 405 is abutted against the asphalt cavity construction rod;
1c) firing the prefabricated core: putting the mounted loam core manufacturing mold into an oven for heating; the heating temperature is 100-500 ℃; heating for 40-120 min.
Preferably, the upper and lower mold members are connected by snap rings provided on both sides thereof.
According to a fourth embodiment of the present application, there is provided a method of shear testing an asphalt concrete contact specimen of the first embodiment, the method comprising the steps of:
1) loading the asphalt concrete contact test piece of the first embodiment into a clamp of the second embodiment, and adjusting the position of the asphalt concrete contact test piece in the clamp by adjusting a stop bolt so that the center of the asphalt concrete contact test piece is coincided with the center of the clamp;
2) loading the jig and environmental box into the MTS apparatus: firstly, arranging an environment box in MTS equipment, then placing a clamp in the environment box, connecting the clamp with a chuck of the MTS equipment through an upper extension bar/a lower extension bar, and finely adjusting the MTS equipment in the process to enable the axes of the upper extension bar and the lower extension bar to coincide;
3) and controlling the MTS equipment to generate acting force on the clamp, and recording the shear test data of the asphalt concrete contact test piece.
According to a third embodiment of the present application, there is provided a clamp for shear testing of an asphalt concrete contact specimen of the first embodiment
A clamp for shear testing of an asphalt concrete contact specimen of the first embodiment, comprising: an adhesive rod sleeving and clamping mechanism; the number of the adhesion rod sleeving and clamping mechanisms is two; one adhesion rod sleeving and clamping mechanism is sleeved and clamped on an adhesion rod on one side of the asphalt concrete contact test piece, and the other adhesion rod sleeving and clamping mechanism is sleeved and clamped on an adhesion rod on the other side of the asphalt concrete contact test piece; the moving direction of the 2 adhesion rod sleeve clamp mechanisms is perpendicular to the axis of the asphalt concrete contact test piece, the external force borne by the 2 adhesion rod sleeve clamp mechanisms is on the same action line, and the action line penetrates through the center of the asphalt sample to be tested.
Preferably, the adhesion rod sheathing mechanism includes: the clamp comprises a clamp base plate, a pull head, a rod sleeving part, a sleeving hole, a stop plate and a stop bolt; the pull head is arranged at one end of the clamp base plate, and the rod sleeving part is arranged at the other end of the clamp base plate; the puller is columnar, the sleeve rod parts of the 2 adhesive rod sleeve clamping mechanisms are mutually attached, and the plane formed by the attachment coincides with the axis of the puller; the trepanning is arranged on the rod sleeving part and is used for sleeving and clamping the adhesion rod; the trepanning of the 2 sticking rod sheathing and clamping mechanisms are coaxial, and the axis of the trepanning is vertical to the plane formed by the 2 sticking rod parts; one end of the stop plate is arranged on the outer edge of the clamp base plate, a stop bolt for adjusting the position of the adhesion rod is arranged at the other end of the stop plate, and the stop bolt is abutted against the tail part, far away from the bonding end part, of the adhesion rod.
In the first embodiment of this application, through the solid material clearance between 2 adhesion rods set up the asphalt concrete contact test piece that the pitch sample that awaits measuring obtained, can be simple and convenient carry out the mechanics experiment to the pitch sample that awaits measuring. When the asphalt needs to be subjected to a tensile test, applying an outward acting force to the 2 adhesion rods, and stretching an asphalt sample to be tested to realize the tensile test of the asphalt; when the compression test of the asphalt is needed, applying an inward acting force to the 2 adhesion rods, compressing the asphalt sample to be tested, and realizing the compression test of the asphalt; when the asphalt needs to be subjected to a torsion test, acting forces with opposite turning directions are applied to the 2 adhesion rods, so that the asphalt sample to be tested is turned, and the torsion test of the asphalt is realized; when the asphalt is required to be subjected to a shear test, the axial lines of the asphalt sample to be tested which are opposite and perpendicular to each other are applied to the 2 adhesion rods, the action lines penetrate through the action force of the center of the asphalt sample to be tested, the asphalt sample to be tested is subjected to shear deformation, and the shear test of the asphalt is realized. In the prior art, the adhesion of a commonly used asphalt concrete contact test piece is in a square shape or other shapes, so that various test requirements on the same test piece are difficult to finish. And, adopt the technical scheme that this application provided, because the adhesion stick with the pitch sample adhesion that awaits measuring is bar-shaped or columnar structure, it can make things convenient for outside machinery to its centre gripping to make a bituminous concrete contact test piece, can satisfy multiple experimental requirement. The first embodiment that this application provided can control the ratio of pitch and adhesion, can simulate asphalt concrete's oilstone ratio, can accurately simulate out the contact mechanics characteristic between pitch and the adhesion to lay reliable basis for asphalt concrete's mechanical properties research.
In the first embodiment of the present application, the adhesion rod used has a spherical adhesion end, so that the adhesion surface of the asphalt and the adhesion is a cambered surface. In the prior art, the contact surfaces of asphalt tests are all flat, and in practical engineering application, asphalt and small stone blocks are mixed for use, and in the microstructure, the asphalt is in contact with the small stone blocks. Although the surface of the stone is uneven and not smooth, the stone is in a convex structure in general, and the surface of the whole stone is spherical on average. In the prior art, a sample obtained by contacting a plane with a sample with asphalt to be measured cannot really reduce the stress condition of the asphalt under the condition of mixing with small stone blocks for use. And among the technical scheme of this application, the bonding tip is the sphere, can simulate under the actual conditions better, the adhesion atress condition of pitch and little stone. Therefore, the asphalt concrete contact test piece provided by the scheme can test the asphalt cementation performance result closer to the actual situation, and lays a solid research foundation for the application of the asphalt concrete aggregate cementation model.
In a first embodiment of the present application, the adhesion rod is a cylinder, which facilitates the clamping of the adhesion rod during the test.
It should be noted that the shape of the adhesive stick can also have other forms, such as a prism shape, and in this embodiment, an external mechanism can be used to apply torque to the adhesive stick. Thereby enlarging the torsion measurable range of the asphalt sample to be measured.
In a first embodiment of the present application, the diameter of the adhesion rod is in the range of 10-100mm, which is good for covering the size of the adhesion mass to asphalt in engineering applications.
In the first embodiment of this application, the pitch sample that awaits measuring is the cylinder for the atress condition of the bonding of pitch sample and adhesion thing is surveyed in the area is single, can not cause because of the shape of self that the unbalanced problem of atress takes place, influences the test result in the atress in-process.
In a first embodiment of the present application, the asphalt sample to be tested is asphalt mortar to be tested. The asphalt mortar is cement asphalt mortar, and is a novel organic-inorganic composite material formed by the combined action of cement hydration hardening and asphalt demulsification and cementation, wherein the raw materials comprise cement, emulsified asphalt, fine aggregate, water, various additives and the like.
In a first embodiment of the present application, the diameter B of the asphalt sample cylinder to be tested is 0.1-1.2A. Namely, the contact area between the asphalt and the adhesion section can be adjusted, so that different oilstone ratios of different asphalts can be simulated. When the ratio of B/A becomes larger, namely the oilstone ratio is increased; when the ratio of B/A becomes smaller, the oilstone ratio decreases. The different oilstone ratios of the different reactions of the size of B of the test piece can detect the contact stress condition of asphalt concrete under the condition of different oilstone ratios.
In a first embodiment of the present application, the size C of the solids gap is between 0.1 and 1.2B. The size of the solid material gap reflects the volume of the asphalt sample to be measured adhered to the adhesion rod, and the apparent is the sparsity of small stones in the asphalt in the practical engineering application. When the value of C is smaller, the small stone blocks in the asphalt are denser; when the value of C is larger, the small stone blocks in the asphalt are more sparse. The same is true.
It should be noted that in practical applications, when the distance between two small stones in the asphalt increases, two situations may occur, one is the detachment of the asphalt due to the small stones, and the other is the fracture of the asphalt itself. By setting different solid material gaps, the mechanical properties of the asphalt and the mechanical properties of the connection of the asphalt and the adhesive can be tested under the conditions of different oilstone ratios.
In a first embodiment of the present application, the adhesive rod is a basalt stone rod because basalt is an aggregate material in asphalt mixes.
In a first embodiment of the present application, the length D of the adhesive stick is 20 to 300 mm. The length of different adhesion rods can meet the requirements of different testing mechanisms.
In the second embodiment of this application, press from both sides the adhesion stick through 2 adhesion stick cover clamp mechanism covers, applys the opposite to 2 adhesion sticks respectively, and the direction of perpendicular to adhesion stick axis, and the effort that the line of action passed the pitch sample center that awaits measuring. So that the asphalt sample to be tested is under the action of shearing force. This anchor clamps are special for the anchor clamps that the bituminous concrete contact test piece implementation shear test research and development that this scheme provided, its can be better with the bituminous concrete contact test piece phase-match that this scheme provided, conveniently adjust the position of bituminous concrete contact test piece in anchor clamps through the backstop bolt to make the effort just in time pass the center of the pitch sample that awaits measuring.
In the third embodiment of this application, through set up prefabricated loam core between 2 adhesion sticks, the inner chamber in the prefabricated loam core communicates with the adhesion terminal surface of adhesion stick, pours pitch into the inner chamber, can be so that fluid pitch solidifies the shaping between the adhesion tip. The C value in the asphalt concrete contact test piece can be adjusted by adjusting the distance of the 2 adhesion rods; the diameter B value of the asphalt sample to be measured can be adjusted by adjusting the diameter of the inner cavity of the precast sand core. Thereby obtaining the requirements for the asphalt concrete contact test piece in the first embodiment.
In a third embodiment of the present application, the precast cores are previously prepared as desired. In the manufacturing process, a layer of tin foil paper covers the inner walls of the upper die component and the lower die component. And (4) separating the precast sand core after firing.
The prefabricated core is made of kaolin serving as a soil mold manufacturing material, and the kaolin has plasticity.
The invention has the following advantages and characteristics.
(1) The plasticity of a soil sample is ensured, kaolin is used as a prefabricated core manufacturing material, and a layer of aluminum foil is required to be additionally arranged on the inner surface of a mold for manufacturing the prefabricated core by utilizing the mold, so that the prefabricated core is easy to take down after being molded and is not broken.
(2) After the contact damage, the residual asphalt mortar is cleaned, asphalt is dissolved mainly through trichloroethylene, residues on the surface of the stone rod are cleaned through clear water, and the stone rod can be recycled after the test is finished.
(3) When a contact model sample is manufactured, the contact of the formed contact can be guaranteed to be the expected size, shape, oil-stone ratio and the like, and the problem that the performance data of the sample is discrete because the asphalt mixture cannot be formed at high temperature is solved.
(4) In the preparation process, the contact model test piece prepared by the mold is ensured to have smooth appearance and no peeling off after being manually compacted after being filled with asphalt mortar and properly trimmed by a blade.
The concrete process for preparing the mud core comprises the following steps:
(1) the upper die component and the lower die component are placed, the inner surfaces of the upper die component and the lower die component are tightly attached to the tinfoil to ensure that the prefabricated loam core is taken out smoothly after being manufactured, the prefabricated loam core is placed in a retaining ring at one side, a groove is formed in the inner side of the retaining ring, the size of the groove is just matched with that of the upper die component and the lower die component, the retaining ring can be fastened with the upper die component and the lower die component due to the design, the loam core cannot move during manufacturing, and the retaining ring at the other side is fastened.
(2) And placing the ball core. The concave adhesion rod is placed from one side of the retaining ring, then the device is filled with more clay and is compressed, and the kaolin is adopted for preparation, so that the device has high plasticity and is not easy to crack. The protruding adhesive stick was then placed. Wherein 2 adhesion stick play the centering through pitch chamber structure stick, are when guaranteeing to consolidate and fill the pitch area with stone stick central point axial symmetry. The asphalt cavity construction rod of the protruding adhesion rod and the groove of the recessed adhesion rod are designed in a matching mode, and the solid material gap is designed by subtracting the depth of the groove from the length of the protruding portion.
The concave adhesion rod and the convex adhesion rod are provided with a ball core outer ring at the joint of the spherical surface and the cylindrical surface, and the ball core outer ring has the same size and thickness as the inner diameter of the upper die part and the lower die part. Because the length of the upper and lower die components is the complete embedding length of the spherical surface of the adhesion rod, the two parts are designed to ensure that the adhesion rod is completely embedded when being embedded into the die from two sides, and the reference function is achieved.
(3) Then, the pouring core is put into the position of the reserved opening of the upper die component. The sprue core can form a through pipeline from the upper opening of the sand core to the connecting part of the two ball cores, and then the pipeline is filled with asphalt.
(4) And (3) putting the placed mould into an oven at 110 ℃ for heating for about 1h, taking out the mould, rotating to take out the sprue core, rotating the two adhesion rods to separate the clay from the adhesion end parts of the adhesion rods, taking out the ball core, forming a space gap between the stone rod and the cementing position of the stone rod when preparing a sample, removing the upper mould and the lower mould, and carefully stripping the clay core and the tin paper on the surface of the clay core to obtain the prefabricated clay core.
The manufacturing method of the asphalt concrete contact test piece comprises the following steps:
(1) the asphalt mortar is placed in an oven at 140 ℃ for heating in advance for standby.
(2) Placing the prepared sand core into a groove in a device, wherein a pouring port is upward;
(3) placing the adhesion rod in the semicircular long through groove, and enabling the adhesion end part to be matched with the loam core inner ball;
(4) the pressing saddle is arranged on the base, and the long bolt in the middle of the pressing saddle is slightly screwed, so that the adhesion rod can not freely move;
(5) pouring high-temperature liquid asphalt from a reserved pouring opening above the sand core, and cooling at room temperature;
(6) taking down the asphalt concrete contact test piece poured with asphalt, carefully peeling off the prefabricated core or putting the asphalt concrete contact test piece into water to wash off the prefabricated core, and airing.
(7) If the asphalt sample to be tested of the asphalt concrete contact test piece is uneven, the asphalt concrete contact test piece can be placed in the device again, a pressing saddle is installed, the asphalt concrete contact test piece is not tightly fixed, and a hand wheel and a blade are installed. And rotating the hand wheel to push the blade, and correcting the sprue and the size of the asphalt to achieve the state before test. After the preparation of the test piece is completed, the asphalt concrete contact test piece can be additionally arranged on an MTS testing machine for tensile, compression and torsion tests.
In a fourth embodiment of the present application, the specific steps of the MTS contact model shear test comprise:
(1) the chuck of the MTS testing machine is replaced by a round hole chuck, and the round hole chuck is fixed by four springs respectively at the upper part and the lower part.
(2) The extension bar is assembled as designed and the nut is slightly unscrewed for later insertion into the shear fixture.
(3) And inserting the rod handle of the assembled lower extension rod into the lower round hole chuck, adjusting the rod handle to keep the extension rod vertical, and then twisting the lower hydraulic switch to fix the lower extension rod.
(4) The method comprises the steps of firstly putting a test piece into a shearing clamp, fixing a stop piece on the shearing clamp through a threaded bolt, then inserting the test piece into the shearing clamp, ensuring that the test piece is in contact with a vertical shaft of a shearing die, adjusting the horizontal position of the test piece through the threaded bolt on the stop piece if the test piece is not centered, and screwing down the threaded bolt after centering is determined.
(5) Place the environment case earlier, guarantee that the top of extension bar is located environment case center below one-third position to the space of putting into shearing anchor clamps and test piece is provided, and guarantee that the distance of chuck is enough on environment case and the MTS, so that install the extension bar.
(6) Through chuck position about fine setting button adjustment MTS testing machine, the adjustment is accomplished the back, will go up extension bar pole handle and insert round hole chuck on the MTS, the adjustment bar handle makes the extension bar keep perpendicular to with extension bar axis coincidence down, if unable coincidence, then the extension bar about readjustment, treat the adjustment and accomplish the back, twist reverse hydraulic switch, fixed extension bar.
(7) The position of the upper chuck is adjusted through an MTS fine adjustment button, and the vertical shaft of the shearing clamp is inserted into the upper extension bar.
(8) The upper nut and the lower nut are screwed up by using the tool, the axis of the upper extension rod and the axis of the lower extension rod are ensured to be coincided in the process, and the vertical shaft of the shearing clamp and the axis of the extension rod are ensured to be coincided.
(9) Test parameters are input through a computer, and the contact position of the test piece generates shearing force through the axial displacement of a chuck of the MTS testing machine.
(10) And recording shear test data by a computer during the test, finishing the test after the contact position of the test piece is broken, storing the test data, and sequentially removing the test clamps from top to bottom.
According to a fifth embodiment of the application there is provided an elongate force transmitting clamp:
an elongate force transmitting clamp comprising: the clamping mechanism is arranged at one end of the rod body and used for clamping the end part of the adhesion rod; when the temperature box is used, the rod body penetrates through the small hole in the upper wall or the lower wall of the temperature box and is connected with the MTS mechanism, so that stress is transferred.
It should be noted that the extension force-transmitting clamp can also be used for clamping a pull head of the shear test clamp provided by the third embodiment of the application. External force is applied to the adhesion rod sleeving and clamping mechanism, and the asphalt sample to be tested is cut.
Compared with the prior art, the invention has the following beneficial effects:
1. the technical scheme provided by the application can accurately simulate the contact mechanical characteristics between the asphalt and the adhesive, thereby laying a reliable foundation for the mechanical property research of asphalt concrete.
Drawings
FIG. 1 is a schematic perspective view of an asphalt concrete contact specimen according to the present application;
FIG. 2 is a schematic plan view of an asphalt concrete contact specimen of the present application;
FIG. 3 is a schematic structural view of the adhesion rod of the present application;
FIG. 4 is a schematic structural view of a precast loam core and mold of the present application;
FIG. 5 is a perspective view of a precast core according to the present application;
FIG. 6 is a schematic view of the mold assembly completed during the prefabrication of the loaf core of the present application;
FIG. 7 is a sectional view of the interior of the mold for prefabricating the cores of the present application;
FIG. 8 is a schematic structural diagram of a fixture installed when the asphalt concrete contact test piece of the present application is subjected to a shear test;
FIG. 9 is a front view of the asphalt concrete contact specimen of the present application after being loaded into a fixture;
FIG. 10 is a perspective view of the adhesive stick colleting mechanism of the present application;
FIG. 11 is a front view of the adhesive stick colleting mechanism of the present application;
fig. 12 is a schematic view of a cast asphalt mold assembly according to the present application.
Reference numerals:
1: an asphalt sample to be tested; 2: an adhesion rod; 201: bonding the end part; 202: a material fixing gap; 3: prefabricating a mud core; 301: matching with the pits; 302: pouring a mouth; 401: a lower die member; 402: an upper die member; 403: a core mold cavity; 404: an asphalt cavity construction rod; 405: burning the core; 406: a retaining ring; 5: an adhesive rod sleeving and clamping mechanism; 501: a clamp substrate; 502: a slider; 503: a rod sleeving part; 504: trepanning; 505: a stopper plate; 506: a stop bolt.
Detailed Description
According to a first embodiment of the present application, there is provided an asphalt concrete contact specimen:
an asphalt concrete contact specimen, comprising: an asphalt sample 1 to be tested and an adhesion rod 2; the number of the adhesion rods 2 is 2; the 2 adhesion rods 2 are coaxially and oppositely arranged; the asphalt sample 1 to be tested is arranged on the solid material gaps 202 of the adjacent bonding end parts 201 of the 2 bonding rods 2.
Preferably, the bonding end 201 is a spherical surface.
Preferably, the adhesion rod 2 is a cylindrical body.
Preferably, the diameter A of the adhesion rod 2 is 10-100mm, preferably A is 15-50 mm; more preferably A is 20-30 mm.
Preferably, the asphalt sample 1 to be measured is adhered to the adhering end portion 201 in a cylindrical shape.
Preferably, the asphalt sample 1 to be tested is asphalt mortar to be tested.
Preferably, the diameter B of the cylindrical body of the asphalt sample 1 to be measured is 0.1-1.2A; preferably B is 0.3-0.8A; more preferably, B is 0.5-0.6A.
Preferably, the size C of the solid material gap 202 is 0.1-1.2B; preferably C is 0.3-0.8B; more preferably, C is 0.5-0.6B.
Preferably, the adhesion rod 2 is a stone rod; preferably a basalt stone rod.
Preferably, the length D of the adhesion rod 2 is 20-300 mm; preferably D is 35-200 mm; more preferably D is 50-100 mm.
According to a third embodiment of the present application, there is provided a clamp for shear testing of an asphalt concrete contact specimen of the first embodiment
A clamp for shear testing of an asphalt concrete contact specimen of the first embodiment, comprising: an adhesive stick collet mechanism 5; the number of the adhesion rod sleeving and clamping mechanisms 5 is two; one adhesion rod sleeving and clamping mechanism 5 is sleeved and clamped on the adhesion rod 2 on one side of the asphalt concrete contact test piece, and the other adhesion rod sleeving and clamping mechanism 5 is sleeved and clamped on the adhesion rod 2 on the other side of the asphalt concrete contact test piece; the moving direction of the 2 adhesion rod sleeve clamp mechanisms 5 is perpendicular to the axis of the asphalt concrete contact test piece, the external force borne by the 2 adhesion rod sleeve clamp mechanisms 5 is on the same action line, and the action line penetrates through the center of the asphalt sample 1 to be tested.
Preferably, the adhesion rod sheathing mechanism 5 includes: a clamp base plate 501, a slider 502, a sleeve rod part 503, a sleeve hole 504, a stop plate 505 and a stop bolt 506; the slider 502 is arranged at one end of the clamp substrate 501, and the rod sleeving part 503 is arranged at the other end of the clamp substrate 501; the puller 502 is columnar, the rod sleeving parts 503 of the 2 adhered rod sleeving and clamping mechanisms 5 are mutually attached, and the plane formed by the attachment is superposed with the axis of the puller 502; the sleeve hole 504 is arranged on the sleeve rod part 503, and the sleeve hole 504 is used for clamping the adhesion rod 2; the trepanning 504 of the 2 sticking rod sheathing and clamping mechanisms 5 are coaxial, and the axis of the trepanning 504 is vertical to the plane formed by the joint of the 2 sticking rod parts 503; one end of the stopper plate 505 is disposed on the outer edge of the clamp base plate 501, and a stopper bolt 506 for adjusting the position of the adhesion rod 2 is disposed on the other end of the stopper plate 505, and the stopper bolt 506 abuts against the tail of the adhesion rod 2 away from the bonding end 201.
According to a third embodiment of the present application, there is provided a method of making the asphalt concrete contact specimen of the first embodiment:
a method of making a first embodiment asphalt concrete contact specimen, the method comprising the steps of:
1) fixing the adhesion rod 2: the bonding end parts 201 of 2 bonding rods 2 are oppositely arranged at the matching concave pits 301 at the two ends of the precast sand core 3; the adhesion rods 2 are coaxially arranged;
2) pouring asphalt: pouring asphalt mortar into the inner cavity of the prefabricated core body 3 through the pouring opening 302 above the prefabricated core body 3, solidifying the asphalt mortar in the inner cavity and adhering the asphalt mortar to the adhering end part 201 to form the asphalt sample 1 to be measured.
Preferably, in the step 1), the method for manufacturing the precast core 3 comprises the following steps:
1a) constructing a prefabricated loam core 3 manufacturing mold: horizontally and oppositely arranging the bonding end parts 201 of 2 bonding rods 2 on a lower die component 401, wherein the bonding rods 2 are coaxially arranged, the parts, below the axis, of the bonding rods 2 are embedded into grooves of the lower die component 401, and the end part of one bonding rod 2 extends out of an asphalt cavity construction rod 404 along the axis and is embedded into the end part of the other bonding rod 2; the upper die component 402 is covered above the bonding end part 201, and the upper die component 402 and the lower die component 401 form a cylindrical loam core die cavity 403 coaxial with the bonding rod 2; filling soil into the soil core mold cavity 403 to form a soil core, wherein the soil occupying space of the bonding end part 201 is a matching pit 301;
1b) constructing a pouring opening 302 of the precast core 3: a hole is formed in the upper die component 402, a sprue core 405 is inserted, and the end of the sprue core 405 abuts against the asphalt cavity construction rod 404;
1c) firing the prefabricated core: putting the mounted loam core manufacturing mold into an oven for heating; the heating temperature is 100-500 ℃; heating for 40-120 min.
Preferably, the upper and lower mold members are connected by snap rings 406 disposed on both sides thereof.
According to a fourth embodiment of the present application, there is provided a method of shear testing an asphalt concrete contact specimen of the first embodiment, the method comprising the steps of:
1) loading the asphalt concrete contact test piece of the first embodiment into the clamp of the second embodiment, and adjusting the position of the asphalt concrete contact test piece in the clamp by adjusting the stop bolt 506 so that the center of the asphalt concrete contact test piece is coincided with the center of the clamp;
2) loading the jig and environmental box into the MTS apparatus: firstly, arranging an environment box in MTS equipment, then placing a clamp in the environment box, connecting the clamp with a chuck of the MTS equipment through an upper extension bar/a lower extension bar, and finely adjusting the MTS equipment in the process to enable the axes of the upper extension bar and the lower extension bar to coincide;
3) and controlling the MTS equipment to generate acting force on the clamp, and recording the shear test data of the asphalt concrete contact test piece.
Example 1
An asphalt concrete contact specimen, comprising: an asphalt sample 1 to be tested and an adhesion rod 2; the number of the adhesion rods 2 is 2; the 2 adhesion rods 2 are coaxially and oppositely arranged; the asphalt sample 1 to be tested is arranged on the solid material gaps 202 of the adjacent bonding end parts 201 of the 2 bonding rods 2.
Example 2
Example 1 was repeated except that the bonded end 201 was spherical. The adhesion rod 2 is a cylinder. The diameter A of the adhesion rod 2 is 20 mm.
Example 3
Example 2 was repeated except that the asphalt sample 1 to be measured was adhered to the adhering end portion 201 in a cylindrical shape. And the asphalt sample 1 to be tested is asphalt mortar to be tested. The diameter B of the to-be-detected asphalt sample 1 cylinder is 0.5A.
Example 4
Example 3 was repeated except that the size C of the consolidation gap 202 was 0.5B.
Example 5
Example 4 was repeated except that the adhesive rod 2 was a basalt stone rod. The length D of the adhesion rod 2 is 50 mm.
Example 6
A clamp for asphalt concrete contact test piece shear test includes: an adhesive stick collet mechanism 5; the number of the adhesion rod sleeving and clamping mechanisms 5 is two; one adhesion rod sleeving and clamping mechanism 5 is sleeved and clamped on the adhesion rod 2 on one side of the asphalt concrete contact test piece, and the other adhesion rod sleeving and clamping mechanism 5 is sleeved and clamped on the adhesion rod 2 on the other side of the asphalt concrete contact test piece; the moving direction of the 2 adhesion rod sleeve clamp mechanisms 5 is perpendicular to the axis of the asphalt concrete contact test piece, the external force borne by the 2 adhesion rod sleeve clamp mechanisms 5 is on the same action line, and the action line penetrates through the center of the asphalt sample 1 to be tested.
Example 7
Example 6 was repeated except that the adhesive stick colleting mechanism 5 included: a clamp base plate 501, a slider 502, a sleeve rod part 503, a sleeve hole 504, a stop plate 505 and a stop bolt 506; the slider 502 is arranged at one end of the clamp substrate 501, and the rod sleeving part 503 is arranged at the other end of the clamp substrate 501; the puller 502 is columnar, the rod sleeving parts 503 of the 2 adhered rod sleeving and clamping mechanisms 5 are mutually attached, and the plane formed by the attachment is superposed with the axis of the puller 502; the sleeve hole 504 is arranged on the sleeve rod part 503, and the sleeve hole 504 is used for clamping the adhesion rod 2; the trepanning 504 of the 2 sticking rod sheathing and clamping mechanisms 5 are coaxial, and the axis of the trepanning 504 is vertical to the plane formed by the joint of the 2 sticking rod parts 503; one end of the stopper plate 505 is disposed on the outer edge of the clamp base plate 501, and a stopper bolt 506 for adjusting the position of the adhesion rod 2 is disposed on the other end of the stopper plate 505, and the stopper bolt 506 abuts against the tail of the adhesion rod 2 away from the bonding end 201.
Example 8
A method of making an asphalt concrete contact specimen, the method comprising the steps of:
1) fixing the adhesion rod 2: the bonding end parts 201 of 2 bonding rods 2 are oppositely arranged at the matching concave pits 301 at the two ends of the precast sand core 3; the adhesion rods 2 are coaxially arranged;
2) pouring asphalt: pouring asphalt mortar into the inner cavity of the prefabricated core body 3 through the pouring opening 302 above the prefabricated core body 3, solidifying the asphalt mortar in the inner cavity and adhering the asphalt mortar to the adhering end part 201 to form the asphalt sample 1 to be measured.
Example 9
Example 8 was repeated except that in step 1), the method of making the precast core 3 included the following steps:
1a) constructing a prefabricated loam core 3 manufacturing mold: horizontally and oppositely arranging the bonding end parts 201 of 2 bonding rods 2 on a lower die component 401, wherein the bonding rods 2 are coaxially arranged, the parts, below the axis, of the bonding rods 2 are embedded into grooves of the lower die component 401, and the end part of one bonding rod 2 extends out of an asphalt cavity construction rod 404 along the axis and is embedded into the end part of the other bonding rod 2; the upper die component 402 is covered above the bonding end part 201, and the upper die component 402 and the lower die component 401 form a cylindrical loam core die cavity 403 coaxial with the bonding rod 2; filling soil into the soil core mold cavity 403 to form a soil core, wherein the soil occupying space of the bonding end part 201 is a matching pit 301;
1b) constructing a pouring opening 302 of the precast core 3: a hole is formed in the upper die component 402, a sprue core 405 is inserted, and the end of the sprue core 405 abuts against the asphalt cavity construction rod 404;
1c) firing the prefabricated core: putting the mounted loam core manufacturing mold into an oven for heating; the heating temperature is 200 ℃; heating time is 60 min.
The upper and lower die members are connected by retaining rings 406 disposed on both sides thereof.
Example 10
A method of shear testing the asphalt concrete contact specimen of example 1, comprising the steps of:
1) loading the asphalt concrete contact test piece of the first embodiment into the fixture of example 6, and adjusting the position of the asphalt concrete contact test piece in the fixture by adjusting the stop bolt 506 so that the center of the asphalt concrete contact test piece coincides with the center of the fixture;
2) loading the jig and environmental box into the MTS apparatus: firstly, arranging an environment box in MTS equipment, then placing a clamp in the environment box, connecting the clamp with a chuck of the MTS equipment through an upper extension bar/a lower extension bar, and finely adjusting the MTS equipment in the process to enable the axes of the upper extension bar and the lower extension bar to coincide;
3) and controlling the MTS equipment to generate acting force on the clamp, and recording the shear test data of the asphalt concrete contact test piece.
Claims (13)
1. The utility model provides an anchor clamps that is used for bituminous concrete to contact test piece shear test which characterized in that, bituminous concrete contacts the test piece and includes: an asphalt sample to be tested (1) and an adhesion rod (2); the number of the adhesion rods (2) is 2; the 2 adhesion rods (2) are coaxially and oppositely arranged; the asphalt sample (1) to be tested is arranged on the solid material gaps (202) of the adjacent bonding end parts (201) of the 2 bonding rods (2); the clamp comprises an adhesion rod sleeving and clamping mechanism (5); the number of the adhesion rod sleeving and clamping mechanisms (5) is two; one adhesion rod sleeving and clamping mechanism (5) is sleeved and clamped on the adhesion rod (2) on one side of the asphalt concrete contact test piece, and the other adhesion rod sleeving and clamping mechanism (5) is sleeved and clamped on the adhesion rod (2) on the other side of the asphalt concrete contact test piece; the moving direction of the 2 adhesion rod sleeving and clamping mechanisms (5) is vertical to the axis of the asphalt concrete contact test piece, the external force borne by the 2 adhesion rod sleeving and clamping mechanisms (5) is on the same action line, and the action line penetrates through the center of the asphalt sample (1) to be tested;
the adhesion rod sheathing and clamping mechanism (5) comprises: the clamp comprises a clamp substrate (501), a slider (502), a sleeve rod part (503), a sleeve hole (504), a stop plate (505) and a stop bolt (506); the slider (502) is arranged at one end of the clamp base plate (501), and the rod sleeving part (503) is arranged at the other end of the clamp base plate (501); the puller (502) is columnar, the rod sleeving parts (503) of the 2 adhered rod sleeving and clamping mechanisms (5) are mutually attached, and the plane formed by the attachment is superposed with the axis of the puller (502); the sleeve hole (504) is arranged on the sleeve rod part (503), and the sleeve hole (504) is used for sleeving and clamping the adhesion rod (2); the trepanning (504) of the 2 sticking rod sheathing and clamping mechanisms (5) are coaxial, and the axis of the trepanning (504) is vertical to the plane formed by the joint of the 2 sticking rod parts (503); one end of the stop plate (505) is arranged on the outer edge of the clamp base plate (501), a stop bolt (506) for adjusting the position of the adhesion rod (2) is arranged at the other end of the stop plate (505), and the stop bolt (506) is abutted to the tail part, far away from the bonding end part (201), of the adhesion rod (2).
2. The clamp according to claim 1, characterized in that said adhesive end (201) is spherical; and/or
The adhesion rod (2) is a cylinder.
3. A clamp as claimed in claim 2, characterised in that the diameter a of the adhesive stick (2) is 10-100 mm.
4. A clamp as claimed in claim 2, characterised in that the diameter a of the adhesive stick (2) is 15-50 mm.
5. A clamp as claimed in claim 2, characterised in that the diameter a of the adhesive stick (2) is 20-30 mm.
6. The clamp according to claim 3, characterized in that the asphalt sample (1) to be tested is adhered to the adhering end part (201) in a cylindrical shape; and/or
The asphalt sample (1) to be tested is asphalt mortar to be tested.
7. The fixture according to claim 6, characterized in that the diameter B of the cylinder of the asphalt sample (1) to be tested is 0.1A-1.2A; the size C of the solid material gap (202) is 0.1B-1.2B.
8. The fixture according to claim 6, characterized in that the diameter B of the cylinder of the asphalt sample (1) to be tested is 0.3A-0.8A; the size C of the solid material gap (202) is 0.3B-0.8B.
9. The fixture according to claim 6, characterized in that the diameter B of the cylinder of the asphalt sample (1) to be tested is 0.5A-0.6A; the size C of the solid material gap (202) is 0.5B-0.6B.
10. A clamp according to any one of claims 1-9, characterized in that the adhesive rod (2) is a stone rod; and/or
The length D of the adhesion rod (2) is 20mm-300 mm.
11. A clamp according to claim 10, characterized in that the adhesive rod (2) is a basalt stone rod; and/or
The length D of the adhesion rod (2) is 35mm-200 mm.
12. A clamp as claimed in claim 10, characterised in that the length D of the adhesive stick (2) is 50-100 mm.
13. A method of performing a shear test on an asphalt contact specimen using the jig for a shear test on an asphalt contact specimen according to any one of claims 1 to 12, the method comprising the steps of:
1) the asphalt concrete contact test piece is loaded into the clamp, and the position of the asphalt concrete contact test piece in the clamp is adjusted by adjusting a stop bolt (506), so that the center of the asphalt concrete contact test piece is superposed with the center of the clamp;
2) loading the jig and environmental box into the MTS apparatus: firstly, arranging an environment box in MTS equipment, then placing a clamp in the environment box, connecting the clamp with a chuck of the MTS equipment through an upper extension bar and a lower extension bar, and finely adjusting the MTS equipment in the process to enable the axes of the upper extension bar and the lower extension bar to coincide;
3) and controlling the MTS equipment to generate acting force on the clamp, and recording the shear test data of the asphalt concrete contact test piece.
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| CN202010135563.7A CN111175111B (en) | 2020-03-02 | 2020-03-02 | Clamp for shear test of asphalt concrete contact test piece and test method thereof |
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| CN202010135563.7A CN111175111B (en) | 2020-03-02 | 2020-03-02 | Clamp for shear test of asphalt concrete contact test piece and test method thereof |
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| CN115326549B (en) * | 2022-10-17 | 2022-12-09 | 新亚新智能科技(南通)有限公司 | Testing machine for testing performance of carbon fiber composite material |
| CN115950820B (en) * | 2023-03-13 | 2023-07-07 | 四川蜀工公路工程试验检测有限公司 | Device and method for measuring interfacial adhesion of asphalt mortar |
| CN117780757B (en) * | 2024-02-28 | 2024-04-30 | 辽宁通用航空研究院 | Adhesive butt joint tensile strength test piece bonding die and bonding method |
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