CN107063903A - A kind of experimental rig for assessing Thermal Crack of Asphalt - Google Patents

A kind of experimental rig for assessing Thermal Crack of Asphalt Download PDF

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Publication number
CN107063903A
CN107063903A CN201710210664.4A CN201710210664A CN107063903A CN 107063903 A CN107063903 A CN 107063903A CN 201710210664 A CN201710210664 A CN 201710210664A CN 107063903 A CN107063903 A CN 107063903A
Authority
CN
China
Prior art keywords
pressure head
test specimen
asphalt
fixture
experimental rig
Prior art date
Application number
CN201710210664.4A
Other languages
Chinese (zh)
Inventor
李蕊
郭琦琪
周珺
朱存贞
张久鹏
裴建中
罗青辉
Original Assignee
长安大学
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Application filed by 长安大学 filed Critical 长安大学
Priority to CN201710210664.4A priority Critical patent/CN107063903A/en
Publication of CN107063903A publication Critical patent/CN107063903A/en

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/32Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
    • G01N3/38Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by electromagnetic means
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0001Type of application of the stress
    • G01N2203/0005Repeated or cyclic
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014Type of force applied
    • G01N2203/0016Tensile or compressive
    • G01N2203/0019Compressive
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/003Generation of the force
    • G01N2203/005Electromagnetic means
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058Kind of property studied
    • G01N2203/006Crack, flaws, fracture or rupture
    • G01N2203/0067Fracture or rupture
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02Details not specific for a particular testing method
    • G01N2203/022Environment of the test
    • G01N2203/0222Temperature
    • G01N2203/0228Low temperature; Cooling means

Abstract

The invention discloses a kind of experimental rig for assessing Thermal Crack of Asphalt, including environmental cabinet, control cabinet, moving beam, bearing, fixture, pressure head, two power transmission shafts, the pressure sensors for detecting the pressure that pressure head is subject to, the displacement transducer of displacement for detecting pressure head and temperature sensor for detecting environmental cabinet internal temperature, wherein, bearing and fixture are located in environmental cabinet, and the experimental rig being capable of accurate evaluation Thermal Crack of Asphalt.

Description

A kind of experimental rig for assessing Thermal Crack of Asphalt

Technical field

The invention belongs to pitch test equipment field, it is related to a kind of experiment dress for assessing Thermal Crack of Asphalt Put.

Background technology

The cold cracking of bituminous paving is one of principal mode of pavement destruction, widely distributed, and harm is serious.Bituminous paving The reason for cold cracking is diversified, and the principal element of influence crack severity has:The property of pitch and asphalt Matter, the composition of asphalt, surface layer and the bonding state of basic unit, the property of base material, Pavement Structure Combination, structure sheaf The internal factor and weather conditions, rate of temperature fall, the volume of traffic and type of vehicle and construction factor etc. such as modulus and thickness are outside Factor.Fatigue rupture, rut and cold cracking are the generally acknowledged failure criteria of bituminous paving rupture.

The method of research Load materials cryogenic property is more at present, and pitch is with modified asphalt binders frequently with bending creep Beam (BBR), uniaxial direct tensile (DT) test method, pitch are then answered with modified asphalt mixture frequently with low-temperature bending, constraint temperature The methods such as power, dynamic shear test.In recent years, pitch and asphalt are carried out using linear elastic fracture mechanics theoretical (LEFM) The research of cryogenic property increases increasingly, and research shows that the theory can reveal that the freezing crack characteristic and rule of material, but existing Having in technology does not have a kind of experimental rig, and the experimental rig is capable of the dress of accurate evaluation pitch Thermal Crack of Asphalt Put.

The content of the invention

Asphalt Mixture at Low Temperature is assessed it is an object of the invention to the shortcoming for overcoming above-mentioned prior art there is provided one kind to resist The experimental rig of fragility energy, the experimental rig being capable of accurate evaluation Thermal Crack of Asphalt.

To reach above-mentioned purpose, the experimental rig of assessment Thermal Crack of Asphalt of the present invention includes ring Border case, control cabinet, moving beam, bearing, fixture, pressure head, two power transmission shafts, the pressure biographies for detecting the pressure that pressure head is subject to Sensor, the displacement transducer of displacement for detecting pressure head and the temperature sensor for detecting environmental cabinet internal temperature, its In, bearing and fixture are located in environmental cabinet;

Environmental cabinet is located on control cabinet, and two power transmission shafts, which are erect, to be fixed on control cabinet, and environmental cabinet is located at two transmissions Between axle, moving beam is located between two power transmission shafts, and moving beam and two power transmission shafts constitute screw-nut body, branch Seat is arranged on the bottom of environmental cabinet, and fixture is arranged on bearing, and the upper surface of fixture is provided with two support blocks, test specimen position to be measured In in two support blocks, pressure head is vertically distributed, and the upper end of pressure head is connected with moving beam, and the lower end of pressure head is inserted in In environmental cabinet, pressure head just treats test block, and projection of the pressure head on fixture is located between two support blocks, provided with control in control cabinet Device and servomotor processed, the output shaft of servomotor are connected with two power transmission shafts, the output end of controller and temperature sensor, The control end of the output end of pressure sensor, the output end of displacement transducer and servomotor is connected.

Two test specimen folders are fixed with fixture, the two ends of test specimen to be measured are held on two test specimen folders respectively.

Erect on fixture and be fixed with two columns, wherein, one test specimen folder of a column correspondence, one end socket of test specimen folder And be fixed on column, the other end of test specimen folder is held on test specimen to be measured.

Tack coat is provided between test specimen and test specimen folder to be measured.

The bottom of fixture is provided with positioning head, and the upper surface of bearing offers the locating slot being engaged with positioning head.

Also include fixed cross beam, wherein, the two ends of fixed cross beam are flexibly connected with two power transmission shafts respectively.

Display, power switch and the chain of command for controlling servomotor and environmental cabinet are provided with the outer wall of control cabinet Plate, display and control panel are connected with controller.

It is connected through a screw thread between the upper end of pressure head and moving beam.

The lower surface of pressure head is covered with rubber layer on semicircular structure, and the lower surface of pressure head.

The invention has the advantages that:

The experimental rig of the present invention for assessing Thermal Crack of Asphalt is in concrete operations, and pressure head is treated The pressure testing process of test block is carried out in environmental cabinet, so that experimental enviroment is closer to actual environment;Pass through servo electricity simultaneously Machine drives transmission shaft driven, and power transmission shaft drives moving beam to move up and down, and moving beam band dynamic head treats test block and carries out lotus The loading and unloading of load, are rolled so as to simulate test specimen to be measured in actual environment by wheel, and it is continuous to treat test block by pressure head Carry out load loading and unloading, until test specimen to be measured be destroyed untill, then according to the number of times of loading, the size of loading force and Displacement in the middle part of test specimen to be measured before and after destruction carries out the assessment of Thermal Crack of Asphalt, simple in construction, easy to operate, Practicality is extremely strong, and result of the test is closer to reality, and accuracy is higher.

Brief description of the drawings

Fig. 1 is structural representation of the invention;

Fig. 2 presss from both sides 4 structural representation for test specimen in the present invention;

Fig. 3 is the structural representation of fixture 11 in the present invention.

Wherein, 1 be power switch, 2 be display, 3 be bearing, 4 be test specimen folder, 5 be test specimen to be measured, 6 be moving beam, 7 it is fixed cross beam, 8 be power transmission shaft, 9 be pressure head, 10 be environmental cabinet, 11 be fixture, 12 be control panel, 13 is positioning head, 14 It is column for control cabinet, 15,16 is support block.

Embodiment

The present invention is described in further detail below in conjunction with the accompanying drawings:

With reference to Fig. 1, Fig. 2 and Fig. 3, the experimental rig of assessment Thermal Crack of Asphalt of the present invention includes Environmental cabinet 10, control cabinet 14, moving beam 6, bearing 3, fixture 11, pressure head 9, two power transmission shafts 8, for detect pressure head 9 by The pressure sensor of pressure, the displacement transducer of displacement for detecting pressure head 9 and for detecting the inside of environmental cabinet 10 temperature The temperature sensor of degree, wherein, bearing 3 and fixture 11 are located in environmental cabinet 10;Environmental cabinet 10 is located on control cabinet 14, two biographies Moving axis 8, which is erect, to be fixed on control cabinet 14, and environmental cabinet 10 is located between two power transmission shafts 8, and moving beam 6 is located at two transmissions Between axle 8, and moving beam 6 and two power transmission shafts 8 constitute screw-nut body, and bearing 3 is arranged at the bottom of environmental cabinet 10 On, fixture 11 is arranged on bearing 3, and the upper surface of fixture 11 is provided with two support blocks 16, and test specimen 5 to be measured is located at two support blocks On 16, pressure head 9 is vertically distributed, and the upper end of pressure head 9 is connected with moving beam 6, and the lower end of pressure head 9 is inserted in environmental cabinet In 10, pressure head 9 is just treating test block 5, and projection of the pressure head 9 on fixture 11 is located between two support blocks 16, in control cabinet 14 Provided with controller and servomotor, the output shaft of servomotor is connected with two power transmission shafts 8, controller and temperature sensor Output end, the output end of pressure sensor, the control end of the output end of displacement transducer and servomotor are connected.

Two test specimen folders 4 are fixed with fixture 11, the two ends of test specimen 5 to be measured are held on two test specimen folders 4 respectively;Fixture Erect on 11 and be fixed with two columns 15, wherein, one test specimen folder 4 of a correspondence of column 15, one end of test specimen folder 4 is socketed and consolidated Due on column 15, the other end of test specimen folder 4 is held on test specimen 5 to be measured;Provided with bonding between test specimen 5 and test specimen folder 4 to be measured Layer.

The bottom of fixture 11 is provided with positioning head 13, and the upper surface of bearing 3 offers the locating slot being engaged with positioning head 13.

Present invention additionally comprises fixed cross beam 7, wherein, the two ends of fixed cross beam 7 are flexibly connected with two power transmission shafts 8 respectively; It is connected through a screw thread between the upper end of pressure head 9 and moving beam 6;The lower surface of pressure head 9 is under semicircular structure, and pressure head 9 Covered with rubber layer on end face.

Display 2, power switch 1 are provided with the outer wall of control cabinet 14 and for controlling servomotor and environmental cabinet 10 Control panel 12, display 2 and control panel 12 are connected with controller.

The present invention specific operation process be:

Cutting obtains the test specimen to be measured 5 of corresponding size from indoor shaping rut plate or actual road surface, then by test specimen 5 to be measured It is connected with test specimen folder 4, test specimen folder 4 is fixed on column 15, then fixture 11 is positioned on bearing 3, user passes through control Panel 12 processed sets temperature, the default load of pressure head 9 and the loading speed of environmental cabinet 10;Environmental cabinet 10 is then turned on, is made to be measured Test specimen 5 is incubated in environmental cabinet 10;

Controller drives moving beam 6 up and down reciprocatingly according to the default load and loading speed of pressure head 9 by servomotor It is mobile, so as to be moved back and forth up and down with dynamic head 9, and then loading and unloading that test block 5 carries out load are treated by pressure head 9, Untill test specimen 5 to be measured is destroyed;Then the stress loss factor alpha of test specimen 5 to be measured and strain loss coefficient β are respectively:Wherein, n is the total degree of load loading when test specimen 5 to be measured is destroyed, and F is the size that pressure head 9 presets load, D is the vertical displacement of the impingement position of 5 seaming chuck of test specimen 9 to be measured before and after test specimen 5 to be measured is destroyed, then answering according to test specimen 5 to be measured Power loss coefficient α and strain loss coefficient β characterize Thermal Crack of Asphalt.

Claims (9)

1. a kind of experimental rig for assessing Thermal Crack of Asphalt, it is characterised in that including environmental cabinet (10), control Case (14), moving beam (6), bearing (3), fixture (11), pressure head (9), two power transmission shafts (8), for detect pressure head (9) by The pressure sensor of pressure, the displacement transducer of displacement for detecting pressure head (9) and for detecting in environmental cabinet (10) The temperature sensor of portion's temperature, wherein, bearing (3) and fixture (11) are located in environmental cabinet (10);
Environmental cabinet (10) is located on control cabinet (14), and two power transmission shafts (8), which are erect, is fixed on control cabinet (14), and environmental cabinet (10) it is located between two power transmission shafts (8), moving beam (6) is located between two power transmission shafts (8), and moving beam (6) and two Individual power transmission shaft (8) constitutes screw-nut body, and bearing (3) is arranged on the bottom of environmental cabinet (10), and fixture (11) is arranged at On bearing (3), the upper surface of fixture (11) is provided with two support blocks (16), and test specimen (5) to be measured is located on two support blocks (16), Pressure head (9) is vertically distributed, and the upper end of pressure head (9) is connected with moving beam (6), and the lower end of pressure head (9) is inserted in ring In border case (10), pressure head (9) is just treating test block (5), and projection of the pressure head (9) on fixture (11) is located at two support blocks (16) Between, controller and servomotor are provided with control cabinet (14), the output shaft of servomotor is connected with two power transmission shafts (8), The output end of controller and temperature sensor, the output end of pressure sensor, the output end of displacement transducer and servomotor Control end is connected.
2. the experimental rig according to claim 1 for assessing Thermal Crack of Asphalt, it is characterised in that fixture (11) two test specimen folders (4) are fixed with, the two ends of test specimen (5) to be measured are held on two test specimen folders (4) respectively.
3. the experimental rig according to claim 2 for assessing Thermal Crack of Asphalt, it is characterised in that fixture (11) erect on and be fixed with two columns (15), wherein, one test specimen folder (4) of column (15) correspondence, the one of test specimen folder (4) End is socketed and is fixed on column (15), and the other end of test specimen folder (4) is held on test specimen to be measured (5).
4. the experimental rig according to claim 3 for assessing Thermal Crack of Asphalt, it is characterised in that to be measured Tack coat is provided between test specimen (5) and test specimen folder (4).
5. the experimental rig according to claim 1 for assessing Thermal Crack of Asphalt, it is characterised in that fixture (11) bottom is provided with positioning head (13), and the upper surface of bearing (3) offers the locating slot being engaged with positioning head (13).
6. the experimental rig according to claim 1 for assessing Thermal Crack of Asphalt, it is characterised in that also wrap Fixed cross beam (7) is included, wherein, the two ends of fixed cross beam (7) are flexibly connected with two power transmission shafts (8) respectively.
7. the experimental rig according to claim 1 for assessing Thermal Crack of Asphalt, it is characterised in that control Display (2), power switch (1) and the control for controlling servomotor and environmental cabinet (10) are provided with the outer wall of case (14) Panel (12), display (2) and control panel (12) are connected with controller.
8. the experimental rig according to claim 1 for assessing Thermal Crack of Asphalt, it is characterised in that pressure head (9) it is connected through a screw thread between upper end and moving beam (6).
9. the experimental rig according to claim 1 for assessing Thermal Crack of Asphalt, it is characterised in that pressure head (9) lower surface is covered with rubber layer on semicircular structure, and the lower surface of pressure head (9).
CN201710210664.4A 2017-03-31 2017-03-31 A kind of experimental rig for assessing Thermal Crack of Asphalt CN107063903A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710210664.4A CN107063903A (en) 2017-03-31 2017-03-31 A kind of experimental rig for assessing Thermal Crack of Asphalt

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Application Number Priority Date Filing Date Title
CN201710210664.4A CN107063903A (en) 2017-03-31 2017-03-31 A kind of experimental rig for assessing Thermal Crack of Asphalt

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108613913A (en) * 2018-06-15 2018-10-02 长安大学 The experimental rig and method of asphalt permeability performance under load-souring
CN108627402A (en) * 2018-05-09 2018-10-09 哈尔滨工业大学 A kind of test equipment and method of analysis pitch freezing crack performance
CN109001440A (en) * 2018-08-08 2018-12-14 同济大学 A method of test concrete antifreezing fragility can

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101216393A (en) * 2007-12-28 2008-07-09 保定天威集团有限公司 Self-adhering transposed conductor integral high-temperature bending strength experimental method and apparatus
CN201440120U (en) * 2009-06-02 2010-04-21 交通部公路科学研究所 Test device for tensile test of force-transferring rod
CN201497676U (en) * 2009-01-12 2010-06-02 攀钢集团研究院有限公司 Bending fixture used for prefabricating fatigue crack
CN201897542U (en) * 2010-11-24 2011-07-13 浙江吉利汽车研究院有限公司 Fatigue performance testing device for small-dimensional materials
CN103076238A (en) * 2012-12-28 2013-05-01 长沙理工大学 Testing device and method for bend-shear performance of asphalt mixture
CN103234825A (en) * 2013-04-12 2013-08-07 长安大学 Pavement material direct tensile test apparatus with eccentric tension avoided and method thereof
CN204027798U (en) * 2014-08-22 2014-12-17 江阴市产品质量监督检验所 A kind of simple and easy falling-ball impact test device
CN205192874U (en) * 2015-10-17 2016-04-27 山东路达试验仪器有限公司 Bituminous mixture bending creep test device
CN205898586U (en) * 2016-07-14 2017-01-18 山西省交通科学研究院 Bituminous mixture bending test testing arrangement

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101216393A (en) * 2007-12-28 2008-07-09 保定天威集团有限公司 Self-adhering transposed conductor integral high-temperature bending strength experimental method and apparatus
CN201497676U (en) * 2009-01-12 2010-06-02 攀钢集团研究院有限公司 Bending fixture used for prefabricating fatigue crack
CN201440120U (en) * 2009-06-02 2010-04-21 交通部公路科学研究所 Test device for tensile test of force-transferring rod
CN201897542U (en) * 2010-11-24 2011-07-13 浙江吉利汽车研究院有限公司 Fatigue performance testing device for small-dimensional materials
CN103076238A (en) * 2012-12-28 2013-05-01 长沙理工大学 Testing device and method for bend-shear performance of asphalt mixture
CN103234825A (en) * 2013-04-12 2013-08-07 长安大学 Pavement material direct tensile test apparatus with eccentric tension avoided and method thereof
CN204027798U (en) * 2014-08-22 2014-12-17 江阴市产品质量监督检验所 A kind of simple and easy falling-ball impact test device
CN205192874U (en) * 2015-10-17 2016-04-27 山东路达试验仪器有限公司 Bituminous mixture bending creep test device
CN205898586U (en) * 2016-07-14 2017-01-18 山西省交通科学研究院 Bituminous mixture bending test testing arrangement

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108627402A (en) * 2018-05-09 2018-10-09 哈尔滨工业大学 A kind of test equipment and method of analysis pitch freezing crack performance
CN108613913A (en) * 2018-06-15 2018-10-02 长安大学 The experimental rig and method of asphalt permeability performance under load-souring
CN109001440A (en) * 2018-08-08 2018-12-14 同济大学 A method of test concrete antifreezing fragility can

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Application publication date: 20170818