CN210071517U - Direct tensile test device of inorganic binder stable material - Google Patents
Direct tensile test device of inorganic binder stable material Download PDFInfo
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- CN210071517U CN210071517U CN201920681736.8U CN201920681736U CN210071517U CN 210071517 U CN210071517 U CN 210071517U CN 201920681736 U CN201920681736 U CN 201920681736U CN 210071517 U CN210071517 U CN 210071517U
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Abstract
The utility model discloses a direct tensile test device of inorganic binder stable material, including test piece fixing system, test piece tensile load system, test piece tensile direction's displacement volume system of measurationing and data acquisition system, test piece tensile load system, displacement system of measurationing and be connected with data acquisition system respectively; the lower end of the test piece is fixed through a fixing system, the tensile load system directly vertically stretches the test piece from the upper end of the test piece, the displacement measurement system tests the displacement variable of the test piece in the direct stretching process, corresponding data of the tensile load and the displacement are obtained through a data acquisition system, a load-displacement curve is made, the maximum tensile load is obtained, and the maximum tensile strength can be obtained through calculation through a tensile strength formula. And obtaining a strain value through the ratio of the displacement to the length of the test piece, making a load-strain curve, and calculating the direct tensile modulus according to a formula. The utility model discloses test device can also survey static and dynamic direct tension resilience modulus class mechanical parameter.
Description
Technical Field
The utility model relates to a road engineering material detection device field, in particular to direct tensile test device of inorganic binder stabilized material.
Background
The inorganic binder stabilizing material is mainly used for a pavement base layer in road engineering, and in the design of a pavement structure, the stretching resistance of the base layer is very critical and often controls and dominates the design result. The direct tensile test is an important method for accurately obtaining the tensile strength and the tensile modulus of the inorganic binder stable material, but because a direct tensile test method is lacked in the current inorganic binder stable material test procedures in China, a corresponding direct tensile test device is not available; in the process of designing the pavement, the elastic modulus results of indirect tensile tests such as splitting or bending tests can be adopted to replace the elastic modulus results, and the design results can be greatly deviated. In addition, due to the particularity of the inorganic binder stabilizing material, a direct tensile test method of asphalt mixture and cement concrete cannot be directly used, and a corresponding test method and a corresponding test device need to be researched and proposed again according to the characteristics of the inorganic binder stabilizing material.
SUMMERY OF THE UTILITY MODEL
To the problem, the utility model provides a direct tensile test device of inorganic binder stabilizing material can be used to survey inorganic binder stabilizing material's mechanical parameters such as direct tensile strength and direct tensile modulus.
The utility model provides a direct tensile test device of inorganic binder stable material which characterized in that: the test device comprises a test piece fixing system, a test piece tensile load system, a test piece displacement measurement system in the tensile direction and a data acquisition system;
the test piece fixing system comprises a test piece lower loading plate, and the lower loading plate is detachably fixed on the base;
the test piece tensile load system comprises an upper loading plate, a stretching rod and an oil pressure loading system, wherein the upper loading plate is detachably fixed at one end of the stretching rod through a connecting piece, the other end of the stretching rod is connected with the oil pressure loading system, and the oil pressure loading system is connected with the data acquisition system in a wired or wireless mode;
the displacement measuring system comprises a plurality of linear displacement sensors, the linear displacement sensors are detachably fixed on the side surface of the test piece, and the linear displacement sensors are connected with the data acquisition system through wires or wirelessly.
The linear displacement sensor comprises sensor fixing blocks and sensor signal receivers, wherein the sensor fixing blocks are positioned at two ends of the connecting rod; the sensor fixing block and the sensor signal receiver are respectively clamped in the U-shaped grooves of the U-shaped steel caps and fixed through fixing screws, and the bottoms of the two U-shaped steel caps are bonded on the side surface of the tested piece in pairs along the vertical direction.
The sensor fixing block can move along the connecting rod and is fixed by a fixing bolt.
The base is a bearing and pulling base, and the bearing and pulling base is fixed with the ground through foundation bolts; the upper surface of the tensile base is provided with a fixed steel plate, and the lower loading plate is connected with the fixed steel plate through a screw.
The tensile base is square, the fixed steel plate is square, the middle part of the fixed steel plate is a convex screw rod, and the fixed steel plate is fixed on the tensile base through bolts positioned at four corners of the square; the center of the upper surface of the lower loading plate is provided with an inner groove for accommodating the bottom of the test piece, and the bottom of the lower loading plate is fixed with the fixed steel plate through a convex screw.
The connecting piece comprises a connecting screw rod; the lower surface center of the upper loading plate is provided with an inner groove for accommodating the bottom of the test piece, the upper part of the upper loading plate is connected through one end of a connecting screw rod and fixed by a nut, and the other end of the connecting screw rod is fixed with one end of a stretching rod and fixed by a nut.
The test piece is cylindrical, the number of the linear displacement sensors is three or more, the linear displacement sensors are fixed at equal angles at equal height positions in the radial direction of the surface of the cylindrical test piece, and the inner grooves are circular grooves.
The oil pressure loading system comprises a load acting rod, a hydraulic oil pipe, an oil tank, an electromagnetic valve and a hydraulic servo controller; the load action rod is connected with the oil tank through a hydraulic oil pipe, the oil tank is connected with the hydraulic servo controller through an electromagnetic valve, and the load action rod is detachably fixed with the other end of the stretching rod.
The test piece tensile load system further comprises a reaction frame, a limit hole is formed in the cross beam above the reaction frame, and the stretching rod or the load acting rod penetrates through the limit hole and can move up and down along the limit hole.
The data acquisition system is a computer.
The utility model discloses a direct tensile test device of inorganic binder stable material, which comprises a test piece fixing system, a test piece tensile load system, a displacement measuring system and a data acquisition system, wherein the test piece tensile load system and the displacement measuring system are respectively in wired or wireless connection with the data acquisition system; the lower end of the test piece is fixed through a fixing system, the tensile load system directly vertically stretches the test piece from the upper end of the test piece, the displacement measuring system tests the displacement variable of the test piece in the direct stretching process, corresponding data of the tensile load and the displacement are obtained through a data acquisition system, a load-displacement curve is made, the maximum tensile load when the test piece is damaged is obtained, and the maximum tensile strength can be calculated through a tensile strength formula (load F/stress area S). Obtaining a strain value through the ratio of the displacement to the length of the test piece, making a load-strain curve, and taking 0.3FmaxStrain value epsilon corresponding to time0.3Direct tensile modulus (0.3F) was calculated according to the formulamax/(Sε0.3))。
Because the test piece is the tensile load that needs to bear, consequently the test piece with the utility model discloses a be connected between the device must be very firm, but also because the test piece needs carry out full water treatment before the experiment, consequently the utility model discloses the part of being connected with the test piece in the device is detachable connection with other parts of device. The connecting part of the fixing system at the lower part of the test piece is a lower loading plate which can be adhered with the test piece, and the lower loading plate is detachably connected with the base; the connecting part of the tensile load system at the upper part of the test piece is an upper loading plate which can be adhered with the test piece, and the upper loading plate and the tensile rod are detachably fixed through the connecting part; the connecting piece of the system for measuring the linear displacement on the side surface of the test piece is a U-shaped steel cap, the U-shaped steel cap can be adhered to the side surface of the test piece, and the U-shaped steel cap and the displacement sensor are detachably fixed through fixing screws. The parts directly connected with the test piece can be replaced if damaged after the test, or the parts can be detached and cleaned in a detachable connection mode for reuse because of bonding pollution.
The linear displacement sensor is a commercially available product, one end of a connecting rod is fixedly connected with a sensor fixing block, the other end of the connecting rod is movably connected with a sensor signal receiver, after the signal receiver of the direct displacement sensor and the sensor fixing block are fixed on the surface of a test piece, the positions of the signal receiver and the sensor fixing block are relatively fixed, the test piece is stretched, the movable connecting end is pulled out to be extended, and the positions of the movable connecting end and the sensor fixing block are changed to generate displacement; when the movable connecting end moves up and down in the sensor signal receiver, the cutting electromagnetic field generates an electric signal, the electric signal is collected in real time through the sensor signal receiver and is transmitted to the data acquisition system to complete displacement data acquisition.
The sensor fixed block can move along the connecting rod and is fixed by a fixing bolt, the position of the sensor fixed block on the connecting rod can be changed relatively, and the sensor fixed block can move along the connecting rod and change the relative position between the sensor signal receiver and the sensor fixed block so as to be applicable to a wider displacement measurement range.
The test piece is preferably cylindrical, and the linear sensors may be a plurality of, preferably 3, and may be uniformly distributed on the side surface of the test piece. The included angle of each linear sensor in the radial direction is the same. The upper end and the lower end of the cylindrical test piece are limited in the circular grooves of the upper loading plate and the lower loading plate and are fixedly bonded.
The oil pressure loading system is a commercially available product and is connected with the data acquisition system so as to obtain load data in time.
Because the tensile load is required to be tensile in the vertical direction, a reaction frame is arranged in order to ensure the vertical direction of force, so that the tensile rod or the load acting rod passes through a limiting hole of the reaction frame, and the direction of the acting force is limited not to deviate.
The utility model discloses a direct tensile test device of inorganic binder stabilizing material can be used to survey inorganic binder stabilizing material's direct tensile strength and direct tensile modulus, can also survey mechanical parameters such as static and dynamic direct tensile modulus of resilience.
Drawings
FIG. 1 is a schematic view of a direct tensile testing apparatus,
figure 2 is a schematic view of the lower fixation system,
figure 3 upper tensile load system schematic (oil pressure pressurization lever in oil pressure loading system only),
FIG. 4 is a schematic view of a displacement measurement system;
FIG. 5 is a schematic view of a displacement sensor;
figure 6 is a layout of displacement sensors on a test piece,
figure 7 is a graph of "load versus displacement",
figure 8 is a graph of "load-strain" curves,
the various reference numbers in the figures are listed below:
the device comprises a test piece 1, a lower loading plate 2, an upper loading plate 3, a connecting screw rod 4, a fixing nut 5, a stretching rod 6, a U-shaped steel cap 7, a sensor fixing block 8, a sensor signal receiver 9, a displacement sensor 10, a fixing screw 11, a fixing bolt 12, a fixing steel plate 13, a connecting rod 14, a tensile base 15, a bolt 16, a load action rod 17, a hydraulic oil pipe 18, an oil tank 19, an electromagnetic valve 20, a hydraulic servo controller 21, a limiting hole 22, a displacement measuring system data acquisition line 23, an oil pressure loading system data acquisition line 24, a reaction frame 25 and a computer 26.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1-5, a direct tensile test device for inorganic binder stabilizing materials comprises a test piece fixing system, a test piece tensile load system, a test piece displacement measurement system in the tensile direction and a data acquisition system, wherein the test piece tensile load system, the displacement measurement system and the data acquisition system are connected in a wired or wireless manner;
the lower fixing system comprises a lower loading plate 2, a fixing steel plate 13 and a tensile base 15; a threaded hole is formed in the center of the bottom surface of the lower loading plate 2, a convex screw is arranged in the middle of the fixed steel plate 13, and holes are formed in four corners of the fixed steel plate 13; the upper surface of the lower loading plate 2 is concave, the lower part of the tested piece 1 can be embedded in the inner groove and fixed by bonding, and a threaded hole in the bottom surface of the lower loading plate 2 is connected with a convex screw on the fixed steel plate 13; the fixed steel plate 13 is fixed on the tensile base 15 through bolts 16; the tensile base 15 is fixed with the ground through foundation bolts 16. As shown in fig. 2.
The upper stretching load system comprises an upper loading plate 3, a connecting screw rod 4, a stretching rod 6 and a load acting rod 7 in an oil pressure loading system connected with the stretching rod; the center of the top surface of the upper loading plate 3 is provided with a threaded hole, the lower surface of the upper loading plate 3 is concave, the upper part of the tested piece 1 can be embedded in the inner groove and fixed through bonding, two ends of the connecting screw rod 4 are respectively fixedly connected with the upper loading plate 3 and the stretching rod 6 through fixing nuts 5, and the stretching rod 6 is connected with a load action rod 17 of an oil pressure loading system. As shown in fig. 3.
The oil pressure loading system is a commercially available product and comprises a load acting rod 17, a hydraulic oil pipe 18, an oil tank 19, an electromagnetic valve 20 and a hydraulic servo controller 21; the load application rod 17 is connected to a tank 19 through a hydraulic oil line 18, and the tank 19 is connected to a hydraulic servo controller 21 through an electromagnetic valve 20. The test piece tensile load system further comprises a reaction frame 25, a limiting hole 22 is formed in the cross beam above the reaction frame 25, the load acting rod 17 penetrates through the limiting hole 22 and can move up and down along the limiting hole 22, and the limiting hole 22 ensures that the direction of tensile load is vertical and upward and does not deviate.
As shown in fig. 4, the displacement measuring system includes a U-shaped steel cap 7 and a displacement sensor 10; the U-shaped steel caps 7 can be bonded to the side faces of the tested piece 1 in pairs along the vertical direction, and the upper U-shaped steel caps 7 are fixed with the displacement sensor by adopting fixing screws 11. Fig. 5 is a schematic structural diagram of a displacement sensor, which is a commercially available product. The linear displacement sensor comprises sensor fixing blocks 8 and a sensor signal receiver 9 which are positioned at two ends of a connecting rod 14; and the sensor fixing block 8 and the sensor signal receiver 9 are respectively clamped in the U-shaped groove of the U-shaped steel cap 7 and fixed through a fixing screw 11. The sensor fixing block 8 can move along the connecting rod 14 and is fixed by the fixing bolt 12.
The utility model discloses a data acquisition system is computer 26, including displacement measurement system and oil pressure loading system's data acquisition part. The displacement measuring system is connected with the computer 26 through a displacement measuring system data acquisition line 23 to complete data acquisition, and the oil pressure loading system is connected with the computer 26 through an oil pressure loading system data acquisition line 24 to complete data acquisition.
Experimental example 1
The embodiment of the method for testing the direct tensile strength of the inorganic binder-stabilized material is illustrated by taking cement-stabilized graded crushed stones as an example.
1) The cement stabilized graded crushed stone CBG25 grades in the table 1 are selected to carry out heavy compaction tests, and the optimal water content is determined to be 5.5%, and the cement dosage is determined to be 6%.
TABLE 1 Cement stabilized graded crushed stone CBG25 graded composition
| Screen hole (mm) | 26.5 | 19 | 13.2 | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| Passage Rate (%) | 99.9 | 83.4 | 68.1 | 57.9 | 40.2 | 24.9 | 16.6 | 10.7 | 6.9 | 5.5 | 4.1 |
2) As the CBG25 in the step 1) is a coarse-grained material, 15 cylindrical test pieces with the diameter multiplied by the height phi of 150mm multiplied by 300mm are formed according to the design result of the step 1).
3) And (3) placing the test piece in the step 2) in a standard health preserving room for health preserving, wherein the health preserving age is 90 d.
4) At 89d, the test piece was taken out of the standard curing chamber and the test piece diameter was measured.
5) And leveling the top and the bottom of the test piece by adopting cement paste. The upper and lower loading plates and the U-shaped steel cap are detached from the test device
6) And the upper loading plate 3 is adhered to the top of the test piece 1 by adopting an adhesive, and the lower loading plate 2 is adhered to the bottom of the test piece 1.
7) And (3) sticking a U-shaped steel cap 7 respectively on 3 parallel straight lines with the offset angle of 120 degrees in the middle of the side surface of the test piece in the vertical direction up and down, wherein the distance between the upper steel cap and the lower steel cap is more than 4 times of the maximum aggregate grain size.
8) The test piece in 7) was placed in a water tank and saturated with water for 24 h.
9) The test piece saturated with water for 24h is taken out of the water, wiped by cloth and placed on a material testing machine, and 3 displacement sensors 10 are respectively arranged between 3 steel caps on parallel straight lines with the offset angle of 120 degrees in the middle of the side surface of the test piece.
Displacement sensor is including being located sensor fixed block 8, the sensor signal receiver 9 at connecting rod 14 both ends, the U-shaped steel cap 7 fixed connection of sensor signal receiver 9 joint in U-shaped steel cap 7 down and through set screw 11 and downside, sensor fixed block 8 moves supreme U-shaped steel cap position along connecting rod 14 to through bolt 12 fixed connection, 8 joints of fixed block are in U-shaped steel cap 7 and fixed through set screw 11 with upside U-shaped steel cap 7. As shown in fig. 5 and 6.
10) And adjusting and resetting the displacement sensor, and applying a tensile test load of 1mm/min until the test piece is damaged.
11) And recording the tensile load borne by the test piece and the tensile displacement generated in the whole tensile test process by using a computer, and recording a load-displacement curve. See FIG. 7
12) The maximum load of the direct tensile test was obtained from the "load-displacement" curve, and the direct tensile strength was calculated, the results of which are shown in table 2.
The direct tensile strength R of each test piece was calculated according to the formula (1)tAnd reserving the last two decimal places.
In the formula: rt-direct tensile strength (MPa);
Fr-maximum tensile load (N);
d-specimen diameter (mm).
TABLE 2 direct tensile Strength test results
| |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
| strength/MPa | 1.21 | 1.12 | 1.07 | 1.21 | 1.18 | 0.98 | 1.12 | 0.95 | 1.09 | 1.01 | 1.15 | 1.19 | 1.26 | 1.04 | 1.11 |
13) From table 2, the average direct tensile strength of the cement stabilized graded macadam CBG25 is: 1.11MPa, standard deviation: 0.09MPa, and the coefficient of variation is: 8.1%, belonging to low variation level. The direct tensile strength at 95% assurance is representative: 1.11 MPa-1.645X 0.09MPa ═ 0.96 MPa.
Experimental example 2
The previous steps 1) -11) are identical to example 1.
12) ' calculation of tensile Strain
In the formula: ε -tensile strain;
d-tensile displacement (mm);
h-test piece height (mm)
13) And (3) drawing a load-strain curve, and obtaining the maximum load of the direct tensile test according to the load-strain curve. As shown in fig. 8.
14) ' 0.3 times maximum load 0.3Fr and corresponding strain ε0.3The tensile modulus Et was calculated according to the formula (3) and expressed as an integer, and the results are shown in Table 3. When the "load-strain" curve start point is not at the 0 point position or the curve start has slight oscillation, the curve start point should be modified to (epsilon)0.3The line connecting the 0.3Fr) point and the corrected (0, 0) point is a straight line on the curve.
In the formula: et-tensile modulus (MPa);
Fr-maximum tensile load (N);
ε′0.3origin corrected ε0.3，ε0.3For loading up to 0.3FrLongitudinal strain of the test piece.
D-specimen diameter (mm).
TABLE 3 direct tensile modulus test results
| |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
| modulus/MPa | 950 | 885 | 981 | 780 | 812 | 834 | 779 | 901 | 882 | 945 | 798 | 801 | 822 | 835 | 860 |
15) ' As can be seen from Table 3, the average direct tensile modulus of the cement stabilized graded macadam CBG25 is: 858MPa, standard deviation: 64MPa, and the coefficient of variation is: the direct tensile modulus representative at 7.5%, 95% assurance is: 858MPa to 1.645 multiplied by 64MPa to 752 MPa.
Claims (10)
1. The utility model provides a direct tensile test device of inorganic binder stable material which characterized in that: the test device comprises a test piece fixing system, a test piece tensile load system, a test piece displacement measurement system in the tensile direction and a data acquisition system;
the test piece fixing system comprises a test piece lower loading plate, and the lower loading plate is detachably fixed on the base;
the test piece tensile load system comprises an upper loading plate, a stretching rod and an oil pressure loading system, wherein the upper loading plate is detachably fixed at one end of the stretching rod through a connecting piece, the other end of the stretching rod is connected with the oil pressure loading system, and the oil pressure loading system is connected with the data acquisition system in a wired or wireless mode;
the displacement measuring system comprises a plurality of linear displacement sensors, the linear displacement sensors are detachably fixed on the side surface of the test piece, and the linear displacement sensors are connected with the data acquisition system through wires or wirelessly.
2. The direct tensile test apparatus of claim 1, wherein:
the linear displacement sensor comprises sensor fixing blocks and sensor signal receivers, wherein the sensor fixing blocks are positioned at two ends of the connecting rod; the sensor fixing block and the sensor signal receiver are respectively clamped in the U-shaped grooves of the U-shaped steel caps and fixed through fixing screws, and the bottoms of the two U-shaped steel caps are bonded on the side surface of the tested piece in pairs along the vertical direction.
3. The direct tensile test apparatus of claim 2, wherein:
the sensor fixing block can move along the connecting rod and is fixed by a fixing bolt.
4. The direct tensile test apparatus of claim 1, wherein: the base is a bearing and pulling base, and the bearing and pulling base is fixed with the ground through foundation bolts; the upper surface of the tensile base is provided with a fixed steel plate, and the lower loading plate is connected with the fixed steel plate through a screw.
5. The direct tensile test apparatus of claim 4, wherein: the tensile base is square, the fixed steel plate is square, the middle part of the fixed steel plate is a convex screw rod, and the fixed steel plate is fixed on the tensile base through bolts positioned at four corners of the square; the center of the upper surface of the lower loading plate is provided with an inner groove for accommodating the bottom of the test piece, and the bottom of the lower loading plate is fixed with the fixed steel plate through a convex screw.
6. The direct tensile test apparatus of claim 1, wherein: the connecting piece is a connecting screw rod; the lower surface center of the upper loading plate is provided with an inner groove for accommodating the bottom of the test piece, the upper part of the upper loading plate is connected through one end of a connecting screw rod and fixed by a nut, and the other end of the connecting screw rod is fixed with one end of a stretching rod and fixed by a nut.
7. The direct tensile test apparatus of claim 6, wherein: the test piece is cylindrical, the number of the linear displacement sensors is three or more, the linear displacement sensors are fixed at equal angles at equal height positions in the radial direction of the surface of the cylindrical test piece, and the inner grooves are circular grooves.
8. The direct tensile test apparatus of claim 1, wherein: the oil pressure loading system comprises a load acting rod, a hydraulic oil pipe, an oil tank, an electromagnetic valve and a hydraulic servo controller; the load action rod is connected with the oil tank through a hydraulic oil pipe, the oil tank is connected with the hydraulic servo controller through an electromagnetic valve, and the load action mechanism is detachably fixed with the other end of the stretching rod.
9. The direct tensile test apparatus of claim 8, wherein: the test piece tensile load system further comprises a reaction frame, a limit hole is formed in the cross beam above the reaction frame, and the stretching rod or the load acting rod penetrates through the limit hole and can move up and down along the limit hole.
10. The direct tensile test apparatus of claim 1, wherein: the data acquisition system is a computer.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110057678A (en) * | 2019-05-13 | 2019-07-26 | 交通运输部公路科学研究所 | A kind of stabilized with inorganic binder material direct tensile test device |
| CN114166665A (en) * | 2021-10-29 | 2022-03-11 | 东南大学 | Test method for evaluating crack resistance of cement stabilized macadam mixture |
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2019
- 2019-05-13 CN CN201920681736.8U patent/CN210071517U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110057678A (en) * | 2019-05-13 | 2019-07-26 | 交通运输部公路科学研究所 | A kind of stabilized with inorganic binder material direct tensile test device |
| CN110057678B (en) * | 2019-05-13 | 2024-01-23 | 交通运输部公路科学研究所 | Direct tensile test device for inorganic binder stabilizing material |
| CN114166665A (en) * | 2021-10-29 | 2022-03-11 | 东南大学 | Test method for evaluating crack resistance of cement stabilized macadam mixture |
| CN114166665B (en) * | 2021-10-29 | 2023-12-22 | 东南大学 | Test method for evaluating cracking resistance of cement stabilized macadam mixture |
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