CN102841021B - Low-temperature splitting tester for fiber asphalt mixture - Google Patents
Low-temperature splitting tester for fiber asphalt mixture Download PDFInfo
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- CN102841021B CN102841021B CN201210329038.4A CN201210329038A CN102841021B CN 102841021 B CN102841021 B CN 102841021B CN 201210329038 A CN201210329038 A CN 201210329038A CN 102841021 B CN102841021 B CN 102841021B
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Abstract
The invention relates to a low-temperature splitting tester for a fiber asphalt mixture. The low-temperature splitting tester comprises a loading mechanism, a horizontal displacement testing mechanism and a vertical displacement testing mechanism as well as a data collecting and analyzing system and the like; loading and vertical deformation as well as horizontal deformation of an asphalt mixture test piece and a fiber asphalt mixture test piece in the whole process from loading to destroying can be accurately tested; splitting tensile load-vertical deformation, splitting tensile load-horizontal deformation entire curve and Poisson's ratio corresponding to different deformations can be obtained conveniently through combining with the collecting system; and the tester has the characteristics of high testing efficiency, high precision and low cost.
Description
Technical field
The invention belongs to engineering detecting testing equipment technical field, is a kind of test unit of testing Fiber Asphalt Mixture cleavage strength and deformation performance.
Background technology
Asphalt is the main paver of China Higher level highway pavement, and during low temperature, the intensity of asphalt and deformation performance are the key technical index of evaluating its anti-low-temperature cracking ability, are the foundations of carrying out theoretical analysis and Asphalt Pavement Structure Design.In view of pulling strengrth and the distortion of direct test asphalt exists many difficulties, highway engineering in China pitch and Asphalt Mixture Experiment rules JTJ 052-2000 adopt the test method of indirectly stretch (splitting).According to the regulation of these rules, when carrying out Asphalt Mixture at Low Temperature diametral compression test, requirement is radially loading along asphalt right cylinder test specimen (being generally marshal piece) under certain cryogenic conditions and certain loading speed, in loading procedure, to record vertical deformation, horizontal distortion and the corresponding payload values of test specimen simultaneously, by measured result, be calculated the parameters such as tensile splitting strength, failure strain, Poisson ratio, stiffness modulus of bitumen mixture specimen.Feasible diametral compression test device reasonable in design, most important to these technical parameters of accurate acquisition.Although existing testing regulations has been stipulated the diametral compression test method of asphalt, but only the structure of test specimen press strip has been done to clearly regulation in method, and the making of whole splitting device is not elaborated, cause and in practical application, carry out device that diametral compression test the used stress-strain curve while being difficult to accurately obtain Asphalt Mixture at Low Temperature splitting, horizontal distortion amount in the time of more should not directly obtaining test specimen destruction, therefore, its horizontal distortion value is not tested in many tests, thereby just can not carry out correct analysis and evaluation to surveyed low temperature performance of asphalt.
Existing low temperature cracking test instrument of asphalt mixture (patent No. CN1793829A) mainly forms by loading fixture and horizontal shift test fixture, wherein measures the device of horizontal distortion, comprises left fixture, right fixture and limited block.Wherein, left fixture comprises left orienting lug, is arranged on left slip inserted link on left orienting lug, is arranged on the elastic element between left orienting lug and left slip inserted link; Right fixture comprises right orienting lug, is arranged on the right slip inserted link on right orienting lug, elastic element, the limited block being arranged between right orienting lug and right slip inserted link is arranged on left slip inserted link or right slip inserted link.Although the structure of this device can test specimen in stretch section among a small circle in actual measurement to the horizontal distortion amount of test specimen, but the growth along with distortion, institute's side data will no longer reflect the real horizontal distortion of test specimen, more can not get the real load-deformation relationship of test specimen curve, reason is that the horizontal center of test specimen can reduce gradually with the increase of distortion, and horizontal displacement meter in this patent can not be coordinated mutually with the distortion at test specimen horizontal direction diametrical position place, so the contact point of the test decorative pearl on top of an official cap of horizontal displacement meter and test specimen level place diameter can depart from the increase of test piece deformation in splitting process, thereby cause the larger result of the larger test error of test piece deformation ability, especially for the Fiber Asphalt Mixture with larger low-temperature deformation ability.Meanwhile, in most testing laboratories, common apparatus (such as environmental cabinet, universal testing machine etc.) all possesses, in this case also without a special Indirect Tensile Tests of Asphalt Mixtures machine of special purchase.For this reason, the cryogenic property parameter of developing a kind of economy and durability, simple operation and accurately testing asphalt, the splitting device that especially can adapt to the Fiber Asphalt Mixture low temperature cleavage fracture parameter testing with larger low-temperature deformation ability, not only can provide precise information for structural design and the theoretical analysis of novel asphalt mixture pavement, and can make full use of existing equipments resources, reduction overlapping investment.
Summary of the invention
The present invention is to provide a kind of Fiber Asphalt Mixture diametral compression test device, can accurately test asphalt and Fiber Asphalt Mixture test specimen from being loaded into load and vertical deformation and the horizontal distortion amount of destroying overall process, in conjunction with acquisition system, can easily obtain splitting and draw load-vertical deformation, split and draw load-horizontal distortion full curve and Poisson ratio corresponding to different distortion amount, and testing efficiency is high, precision is high, cost is low.
Technical scheme: a kind of Fiber Asphalt Mixture low temperature cracking test device, comprise that mechanism is measured in load maintainer, horizontal shift and mechanism is measured in perpendicular displacement, and data collection and analysis system; Wherein, load maintainer comprises the framework that upper and lower pressing plate and vertical guide pole form, the upper end of vertical guide pole is fixed on top board downside, and stretch out in the pilot hole of lower platen setting the lower end of vertical guide pole, and pressure testing machine is exerted pressure and made both relative slidings upper and lower pressing plate; Center at top board downside is provided with load transducer, the downside of load transducer is gone up arc press strip link longitudinally by web member and one, in the center of lower platen upside, be provided with arc lower press strip longitudinally, described upper and lower arc press strip is corresponding; A side at upper arc press strip is connected with vertical displacement meter top board, vertically fixes a pole on described lower platen, and vertical displacement meter is installed on pole, and the measurement termination of this vertical displacement meter and described vertical displacement meter top board are used in conjunction with; At upper and lower arc press strip zone line, be provided with horizontal displacement meter framework, the arranged on left and right sides of this framework is separately installed with asymmetric vertical supporting rod, and test specimen is between two supporting rods; The wherein vertical supporting rod in left side and framework fixed installation, a guide pole is laterally fixed at the vertical supporting rod back side on right side, this guide pole end is connected with horizontal shift test top board, this guide pole middle part is provided with rail plate, between rail plate and adjacent vertical supporting rod, be connected with pressure spring, described rail plate one side is fixed on described framework, and horizontal displacement meter is installed simultaneously on framework, and the measurement termination of this horizontal displacement meter and described horizontal shift test top board are used in conjunction with; The signal wire of described load transducer, vertical displacement meter and horizontal displacement meter is connected with computer input end by A/D converter.
Lower surface at lower platen is provided with dog screw sliding guide groove, and in this guide groove, Matching installation has location to screw screw, and this location screws screw and adjusts according to the lower platen size of pressure testing machine, and described test unit is anchored on testing machine.
The center, upper surface of top board is provided with spherical indenter, and this spherical indenter is as the direct contact component of pressure testing machine.
The bottom of described horizontal shift framework is provided with pulley.
The lower end of the vertical guide pole between the upper and lower pressing plate height adjustment knob that has been threaded.
The inner side of the vertical supporting rod of arranged on left and right sides is triangular prism structure.
The guide pole end at the vertical supporting rod back side, right side is also provided with draw ring.
Beneficial effect: (1) lower platen location screws the setting of screw, be convenient to splitting device accurately to install and be positioned on testing machine lower platen, avoiding adjusting splitting device because of centering repeatedly loses time, this test to the strict bitumen mixture specimen of temperature requirement is particularly important, has guaranteed the accuracy of test findings; Lower platen fixedly screws the regulatory function of screw, makes splitting device can be applicable within the specific limits the testing machine lower platen of different size, thereby can make full use of the existing instrument and equipment of testing laboratory, expands its usable range, reduces overlapping investment, economizes on resources.
(2) the reverse installation of vertical displacement meter and horizontal displacement meter, makes displacement meter can carry out Pop-up and measures test piece deformation, has avoided the traditional formula that pushes back assay method easily to cause displacement meter because of maloperation or the excessive defect of being damaged by pressure of test piece deformation.
(3) setting of upper arc press strip rotating shaft, guarantees that test specimen is stressed evenly, the adverse effect of having avoided bias voltage and the test specimen changing of the relative positions to cause test findings.
(4) inside arc lower press strip, the setting of test specimen spacing preiection is beneficial to and accurately lays test specimen, and arc lower press strip can be pressed on test specimen just.
(5) the rectilinear setting of test specimen supporting rod, guaranteed to make supporting rod can well clamp test specimen diametrical position place in whole diametral compression test process, avoid the reduction because of test specimen center in conventional test methodologies to make the displacement meter decorative pearl on top of an official cap depart from too early the defect of test specimen horizontal diameter position, thereby guaranteed the accuracy of measured result.
(6) linear design of test specimen supporting rod and test specimen contact point, guaranteed that test specimen can contact well with supporting rod in the stressed whole horizontal distortion test process of test specimen, add three test specimen supporting rods and in level, be the layout of bikini, guaranteed the accurate of horizontal distortion test result.
(7) pulley of test specimen supporting rod bottom can reduce the restriction of supporting rod to test piece deformation, guarantees the accuracy of measured result.
(8) square _type layout in horizontal slip guide rod and horizontally-sliding guide cross section, has guaranteed that three test specimen supporting rods are all the time in identical direction clamping test pieces, thereby has obtained horizontal distortion test result accurately.
(9) data in data collection and analysis system energy real time record process of the test also can be carried out analyzing and processing to test findings, provide rational parameter.
(10) this diametral compression test device is measured test piece deformation by displacement transducer, especially testing level distortion, avoid pasting because adopting the higher shortcoming of complex operation, cost that foil gauge method is brought, especially the test to the larger fiber asphalt concrete splitting parameter of distortion, owing to may causing foil gauge to be pulled off after load peak value, cannot continue test, adopt this splitting device can obtain desirable test findings, thereby this device is easier to promotion and implementation.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention 1;
Fig. 2 is the A-A diagrammatic cross-section in Fig. 1;
Fig. 3 is B-B diagrammatic cross-section in Fig. 1;
Fig. 4 is bituminous concrete splitting load-vertical deformation curve and load-horizontal distortion curve under 10 ℃ of conditions;
Fig. 5 is bituminous concrete splitting load-vertical deformation curve and load-horizontal distortion curve under 30 ℃ of conditions.
Embodiment
Below with reference to the accompanying drawings and embodiment the present invention is described in further details, but the invention is not restricted to the following stated embodiment.
Embodiment 1.Referring to Fig. 1, Fig. 2 and Fig. 3, in figure, the Asphalt Mixture at Low Temperature diametral compression test device of the present embodiment is by spherical indenter 1, top board 2, load transducer 3, upper arc press strip link part 4, upper arc press strip 5, load guide pole 6, test specimen 7, arc lower press strip 8, lower platen 9, dog screw sliding guide groove 10, lower platen location screws screw 11, height adjustment knob 12, test specimen supporting rod 13, pulley 14, horizontal displacement meter framework 15, spring 16, pilot hole 17, horizontally-sliding guide 18, horizontal slip guide rod 19, draw ring 20, horizontal shift test top board 21, horizontal displacement meter locking clamp 22, horizontal displacement meter 23, vertical displacement meter pole 24, vertical displacement meter top board 25, vertical displacement meter locking clamp 26, vertical displacement meter 27, computing machine 28, A/D converter 29 connects formation.
The spherical indenter 1 of the present embodiment loading structure is directly to bear the element that testing machine transmits load, and load is continued to Transmit evenly to load transducer 3 by top board 2, load transducer 3 continues load to pass to the upper arc press strip link part 4 connecing by silk with it, upper arc press strip link part 4 for axle is connected, guarantees that test specimen is stressed evenly with upper arc press strip 5 like this.Loading guide pole 6 is to guarantee that upper arc press strip 5 and arc lower press strip 8 vertical direction in loading procedure keeps the element of centering, when test specimen 7 is carried out to load test, the pressure testing machine pushing tow lower platen 9 that makes progress, lower platen 9 moves upward along loading guide poles 6 by pilot hole 17, makes to be positioned over that test specimen 7 on arc lower press strip 8 moves closer to arc press strip 5 and stressed.Arc lower press strip 8 is consolidated in the center of lower platen 9, that test specimen 7 is positioned to the element of placing and it being loaded, before test, first test specimen 7 is positioned on arc lower press strip 8, and accurately locate by the projection of one end, by the effect of upper arc lower press strip, guarantee the realization of splitting loading mode.Lower platen 9 is support and loading elements of whole device, while using Indirect Tensile Tests of Asphalt Mixtures device of the present invention, first lower platen 9 is positioned on testing machine lower platen, make spherical indenter 1 aim at the top board center of pressure testing machine, along dog screw sliding guide groove 10 slip lower platen location, screw screw 11, the lower platen 9 of this test unit is fixed on the lower platen of pressure testing machine, rotate height adjustment knob 12, make to stop enough spaces between arc press strip 5 and arc lower press strip 8 and place test specimen 7.
In the present embodiment, horizontal shift mensuration mechanism is connected and is formed by test specimen supporting rod 13, pulley 14, horizontal displacement meter framework 15, spring 16, horizontally-sliding guide 18, horizontal slip guide rod 19, draw ring 20, horizontal displacement meter top board 21, horizontal displacement meter meter locking clamp 22 and horizontal displacement meter 23.Horizontal displacement meter framework 15 surface levels are inwardly U-shaped of opening, its two companies limb is asymmetric, and Left-wing Federation's limb is slightly long, fixed two the test specimen supporting rods 13 of vertical direction, test specimen supporting rod 13 bottoms are connected with pulley 14 by axle, the resistance of supporting rod to test specimen while reducing test piece deformation.The right limb of horizontal displacement meter framework 15 is slightly short, and it is square horizontally-sliding guide 18 that its right side arranges cross section, is similarly the horizontal slip guide rod 19 of square-section through horizontally-sliding guide 18, and the two adopts clearance fit, and lubricant is set in gap.Horizontal slip guide rod 19 near a side of test specimen fixed vertically to test specimen supporting rod 13,18 of test specimen supporting rod 13 and horizontally-sliding guides arrange spring 16, spring 16 promotes right side test specimen supporting rods makes test specimen clamped.Horizontal slip guide rod 19 arranges draw ring 20 through the right-hand member of horizontally-sliding guide 18, the inner side of draw ring connects horizontal shift test top board 21, the fixed horizontal displacement meter locking clamp 22 of upside in the right limb of the horizontal displacement meter framework 15 corresponding with horizontal shift test top board 21, horizontal displacement meter 23 is fixed on horizontal displacement meter locking clamp 22, when test piece deformation, promoting left and right test specimen supporting rod does relative motion, test specimen supporting rod finally makes horizontal shift test top board 21 and horizontal displacement meter locking clamp 22 do relative motion by the transmission of each element, make horizontal displacement meter 23 record the horizontal distortion amount of test specimen.The rectilinear setting of test specimen supporting rod 13, guarantee to make supporting rod can well clamp test specimen diametrical position place in whole diametral compression test process, avoided the reduction because of test specimen center in conventional test methodologies to make the displacement meter decorative pearl on top of an official cap depart from too early the defect of test specimen horizontal diameter position.Test specimen supporting rod 13 is triangular in shape near the horizontal section of test specimen, with the summit that is triangular-section, test specimen contact position, be beneficial to fully contact with test specimen three test specimen supporting rod also distributions triangular in shape in the horizontal direction, the like this accuracy of the assurance horizontal distortion amount of surveying.Pulley is connected in test specimen supporting rod bottom, the resistance when reducing test specimen supporting rod along level to relative motion, thus reduce the test error of horizontal distortion.
In the present embodiment, perpendicular displacement mensuration mechanism is connected and is formed by vertical displacement meter pole 24, vertical displacement meter top board 25, vertical displacement meter locking clamp 26.Vertical displacement meter pole 24 is vertical to the outward flange that is consolidated in lower platen 9, vertical displacement meter locking clamp 26 is consolidated in vertical displacement meter pole top, vertical displacement meter top board 25 is consolidated in the outside of arc press strip 5, vertical displacement meter 27 is installed on vertical displacement meter locking clamp 26, and test specimen 7 is subject to the relative motion of vertical displacement meter top board 25 and vertical displacement meter locking clamp 26 after splitting to make vertical displacement meter 27 record the vertical deformation amount of test specimen.Adopt the method for displacement meter Pop-up test test piece deformation amount to avoid the traditional formula that pushes back assay method easily to cause displacement meter because of maloperation or the excessive defect of being damaged by pressure of test piece deformation.
Data collection and analysis system in the present embodiment is connected and is formed by load transducer 3, horizontal displacement meter 23, vertical displacement meter 27, A/D converter and computing machine.The load signal that load transducer 3 is subject to received bitumen mixture specimen converts electric signal to and passes to A/D converter 29 by data cable, the horizontal direction deformation signal that horizontal displacement meter 23 is subject to received bitumen mixture specimen converts electric signal to and passes to A/D converter 29 by data cable, vertical displacement meter 27 received bitumen mixture specimen is subject to vertically to deformation signal convert electric signal to and pass to A/D converter 29 by data cable, A/D converter 29 converts the electric signal of input to digital signal and is input to computing machine 28, computing machine 28 can show the load in process of the test and displacement signal constantly by control and analysis software, and result is carried out to analyzing and processing, provide the tensile splitting strength of surveyed bitumen mixture specimen, failure strain, Poisson ratio, the technical parameters such as bad stiffness modulus.
Other embodiment.Change connecting mode and concrete specification and the structure of spherical indenter 1 and top board 2, the connecting mode of arc press strip 5, upper arc press strip link part 4 and load transducer 3 and concrete specification and structure in change, change quantity and concrete specification and the structure of vertical displacement meter locking clamp 26 and horizontal displacement meter meter locking clamp 22, change test specimen supporting rod 13 quantity and concrete specification and structure, and the connecting mode of change horizontal displacement meter framework 15, concrete specification and structure all can form a plurality of embodiment, be common variation of the present invention, at this, do not describe in detail one by one.
verification experimental verification
Certain university's building material and structural research center applications Fiber Asphalt Mixture diametral compression test of the present invention device to test cleavage strength and the deformation performance of fiber asphalt concrete test specimen, obtained satisfactory result.The dense-graded asphalt concrete grading limit intermediate value of this example Mineral Material grating code requirement JTG F40-2004 regulation, particle diameter is porous basalt more than 1.18mm, below 1.18mm is ls, filler is levigate agstone, pitch used is attached most importance to and is handed over AH-70, has mixed the dacron of asphalt concrete quality 0.2%.Test is carried out respectively under 10 ℃ and 30 ℃ of conditions, and gained 0.2% dacron volume bituminous concrete splitting load-vertical deformation curve and load-horizontal distortion curve are shown in Fig. 4 and Fig. 5, and test findings is in Table 1.
Table 1
| Temperature/℃ | Vertical deformation/mm | Horizontal distortion/mm | Load/kN | Cleavage strength/MPa | A | Poisson ratio u | Failure strain/u ε | Stiffness modulus/MPa |
| 10 | 2.09 | 0.306 | 31.19 | 3.09 | 6.83 | 0.253 | 6363 | 839 |
| 30 | 6.33 | 1.314 | 4.44 | 0.44 | 4.82 | 0.469 | 26528 | 39 |
Can find out, utilize Indirect Tensile Tests of Asphalt Mixtures device of the present invention can conveniently obtain cleavage strength and deformation values, especially the horizontal distortion value of bituminous concrete test specimen under different tests condition.
Claims (7)
1. a Fiber Asphalt Mixture low temperature cracking test device, is characterized in that: comprise that mechanism is measured in load maintainer, horizontal shift and mechanism is measured in perpendicular displacement, and data collection and analysis system; Wherein, add the framework that control feel simulator comprises that upper and lower pressing plate and vertical guide pole form, the upper end of vertical guide pole is fixed on top board downside, and stretch out in the pilot hole of lower platen setting the lower end of vertical guide pole, and pressure testing machine is exerted pressure and made both relative slidings upper and lower pressing plate; Center at top board downside is provided with load transducer, the downside of load transducer is gone up arc press strip link longitudinally by web member and one, in the center of lower platen upside, be provided with arc lower press strip longitudinally, described upper and lower arc press strip is corresponding; A side at upper arc press strip is connected with vertical displacement meter top board, vertically fixes a pole on described lower platen, and vertical displacement meter is installed on pole, and the measurement termination of this vertical displacement meter and described vertical displacement meter top board are used in conjunction with; At upper and lower arc press strip zone line, be provided with horizontal displacement meter framework, the arranged on left and right sides of this framework is separately installed with asymmetric vertical supporting rod, and test specimen is between two supporting rods; The wherein vertical supporting rod in left side and framework fixed installation, a guide pole is laterally fixed at the vertical supporting rod back side on right side, this guide pole end is connected with horizontal shift test top board, this guide pole middle part is provided with rail plate, between rail plate and adjacent vertical supporting rod, be connected with pressure spring, described rail plate one side is fixed on described framework, and horizontal displacement meter is installed simultaneously on framework, and the measurement termination of this horizontal displacement meter and described horizontal shift test top board are used in conjunction with; The signal wire of described load transducer, vertical displacement meter and horizontal displacement meter is connected with computer input end by A/D converter.
2. Fiber Asphalt Mixture low temperature cracking test device according to claim 1, it is characterized in that: the lower surface at lower platen is provided with dog screw sliding guide groove, in this guide groove, Matching installation has location to screw screw, this location screws screw and adjusts according to the lower platen size of pressure testing machine, and described test unit is anchored on testing machine.
3. Fiber Asphalt Mixture low temperature cracking test device according to claim 1, is characterized in that: the center, upper surface of top board is provided with spherical indenter, and this spherical indenter is as the direct contact component of pressure testing machine.
4. Fiber Asphalt Mixture low temperature cracking test device according to claim 1, is characterized in that: the bottom of described horizontal displacement meter framework is provided with pulley.
5. Fiber Asphalt Mixture low temperature cracking test device according to claim 1, is characterized in that: the lower end of the vertical guide pole between the upper and lower pressing plate height adjustment knob that has been threaded.
6. Fiber Asphalt Mixture low temperature cracking test device according to claim 1, is characterized in that: the inner side of the vertical supporting rod of arranged on left and right sides is triangular prism structure.
7. Fiber Asphalt Mixture low temperature cracking test device according to claim 1, is characterized in that: the guide pole end at the vertical supporting rod back side, right side is also provided with draw ring.
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| CN201210329038.4A CN102841021B (en) | 2012-09-07 | 2012-09-07 | Low-temperature splitting tester for fiber asphalt mixture |
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| CN201210329038.4A CN102841021B (en) | 2012-09-07 | 2012-09-07 | Low-temperature splitting tester for fiber asphalt mixture |
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| CN102841021B true CN102841021B (en) | 2014-10-08 |
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| CN103499493B (en) * | 2013-10-14 | 2016-08-10 | 中南大学 | A kind of method determining fragile material splitting-tensile strength |
| CN103983516B (en) * | 2014-06-10 | 2017-02-15 | 山东大学 | Method for measuring and calculating poisson ratio of soil body |
| CN104792611B (en) * | 2015-04-20 | 2017-09-15 | 郑州大学 | Concrete compression bursting stress strain full curve test device |
| CN107843187B (en) * | 2017-12-18 | 2023-05-26 | 武汉理工大学 | Self-adaptive transverse deformation measuring device and measuring method |
| CN108398379B (en) * | 2018-02-06 | 2020-11-13 | 扬州大学 | Asphalt mastic fiber drawing testing machine |
| CN108896422B (en) * | 2018-09-13 | 2024-03-19 | 郑州大学 | Device and method for testing bonding performance of reinforcement and concrete under repeated load |
| CN109765115A (en) * | 2019-03-05 | 2019-05-17 | 中国水利水电科学研究院 | A kind of bituminous concrete Hydraulic fracturing test device and method |
| CN113125339A (en) * | 2020-01-16 | 2021-07-16 | 香港理工大学深圳研究院 | Testing method, carrier and device for interlayer bonding strength of 3D printed cement product |
| CN113865995B (en) * | 2021-10-25 | 2022-06-24 | 同济大学 | Method and system for evaluating medium-temperature crack resistance of asphalt mixture and storage medium |
| CN114199759B (en) * | 2021-12-16 | 2023-04-18 | 山东省路桥集团有限公司 | Asphalt and aggregate adhesion performance test mold and quantitative evaluation method |
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