CN110057673A - A kind of stabilized with inorganic binder material uniaxial direct tensile Modulus Test Method - Google Patents
A kind of stabilized with inorganic binder material uniaxial direct tensile Modulus Test Method Download PDFInfo
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- CN110057673A CN110057673A CN201910393166.7A CN201910393166A CN110057673A CN 110057673 A CN110057673 A CN 110057673A CN 201910393166 A CN201910393166 A CN 201910393166A CN 110057673 A CN110057673 A CN 110057673A
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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
Abstract
The present invention relates to a kind of uniaxial direct tensile Modulus Test Methods of stabilized with inorganic binder material, belong to highway material performance test field.The cylinder test specimen of present invention production stabilized with inorganic binder material, linear displacement transducer is evenly equipped in periphery, cylinder test specimen one end is fixed on pedestal, the other end is fixed on testing machine, and by the tensile loads of testing machine, note shows load-shift value, it calculates and draws load-strain curve, maximum tension load when test specimen destroys is obtained, so that maximum strain when being destroyed, takes 0.3 times of peak load 0.3Fr and its corresponding strain stress0.3, stretch modulus Et is calculated according to formula (2).Method of the invention can more directly reflect the stretch modulus of stabilized with inorganic binder material, provide more direct reference data for Pavement Structure Design.
Description
Technical field
The present invention relates to technical field of road engineering, in particular to a kind of uniaxial direct tensile mould of stabilized with inorganic binder material
Weight testing method.
Background technique
Stabilized with inorganic binder material is mainly used for the sub-surface in road engineering, in Pavement Structure Design, base
Tensile resistance it is very crucial, often control and dominate design result.Direct tensile test be it is a kind of accurately obtain it is inorganic
The important method of binder stabilizing material stretch modulus, but due to being lacked in the existing stabilized with inorganic binder testing of materials regulation in China
Few uniaxial direct tensile modulus test method, when Pavement Design, can only be using the modulus knots of the Indirect Tensile Tests such as splitting or bend test
Fruit replaces, and will lead to design result and relatively large deviation occurs.Further, since the particularity of stabilized with inorganic binder material, it can not
The uniaxial direct tensile modulus test method for directly using asphalt and cement concrete, needs for stabilized with inorganic binder material
The characteristics of material, which restudies, proposes corresponding test method.
Summary of the invention
In view of the above-mentioned problems, the invention proposes a kind of stabilized with inorganic binder material uniaxial direct tensile Modulus Test Method,
For obtaining the stretch modulus of stabilized with inorganic binder material, the Modulus results than existing Indirect Tensile Tests more can be close to very
Real stretch modulus.
A kind of stabilized with inorganic binder material uniaxial direct tensile Modulus Test Method, including following sequential steps:
(1) shaping inorganic binder stabilizing material cylinder test specimen, health 90 or 180 days, the health in Standard Curing room
To the previous day of regulation age, cylinder test specimen diameter is measured；
(2) upper load plate to be pasted at the top of test specimen using adhesive, lower load plate is pasted in the bottom of test specimen,
(3) it takes out and dries after test specimen being satisfied water health 24 hours, 3 or 3 or more linear displacement transducers are fixed respectively
In test specimen side medium position, linear displacement transducer is radially angularly distributed in cylinder test specimen, and linear displacement transducer
Measure the short transverse that direction of displacement is cylinder test specimen；
(4) Material Testing Machine is connect with upper load plate, lower load plate is fixed on pedestal, adjusts linear displacement transducer
And reset, loading speed is selected, tension test load is applied, until test specimen destroys；
5) the stretching displacement d of the test specimen tensile load F born during entire tension test and generation are recorded；
6) elongation strain is calculated by formula (1),
In formula: ε --- elongation strain；
D --- stretching displacement (mm)；
H --- height of specimen (mm)；
7) " load-strain " curve is drawn, each test specimen direct tensile test is obtained according to " load-strain " curve
Peak load Fr.
8) 0.3 times of peak load 0.3Fr and its corresponding strain stress are taken0.3, stretch modulus Et is calculated according to formula (2), use is whole
Number indicates；
In formula: Et--- stretch modulus (MPa)；
Fr--- maximum tension load (N)；
ε′0.3--- the revised ε of origin0.3, ε0.3Reach 0.3F for loadrWhen test specimen longitudinal strain；
D --- test specimen diameter (mm).
Not when there are slight concussion in 0 position or curve starting, fair curve rises " load-strain " origin of curve
Point makes (ε0.3, 0.3Fr) point with revised (0,0) point line on curve be straight line.
The linear displacement transducer includes the receiver and fixed block positioned at connecting rod both ends, the receiver and connection
Block is fixed on test specimen side vertical face position above and below.
The test specimen is satisfied before water, pastes a U-shaped steel cap, upper and lower U-shaped in the upper and lower each vertical face position of surface of test piece
Spacing between steel cap should be greater than gathering materials 4 times of maximum particle diameter, and the receiver is connected in lower U-shaped steel cap and by fixed spiral shell
Silk is fixedly connected with lower steel cap, and the fixed block moves up and down to lower U-shaped steel cap position along connecting rod and makes to connect by bolt
Bar is fixedly connected with fixed block, and the fixed block is connected in U-shaped steel cap and is fixed with upper steel cap by fixed screw.
It will be smoothed out at the top and bottom of test specimen before the step (2) using cement paste.
Full water in the step (3) is to put test specimen to impregnate in the sink for 24 hours, make the water surface be higher by test specimen top surface 25mm with
On.
The linear displacement transducer is there are three being distributed in the middle part of test specimen side, in test specimen between each linear displacement transducer
Radial is in 120 ° of angles.
Moisture content 4-7% in the stabilized with inorganic binder material cylinder test specimen, cement content 4-6%, other is broken
Stone.
The stabilized with inorganic binder material medium stone is fine material, middle grain material or coarse material, the cylindrical body
Test specimen diameter × height is respectively φ 100mm × 200mm, φ 100mm × 200mm, φ 150mm × 300mm.
The stabilized with inorganic binder material medium stone is fine material, middle grain material, and preparing number of test-pieces is 9, directly
Tensile strength calculation numerical value is connect to be averaged；The stabilized with inorganic binder material medium stone is that coarse material prepares number of test-pieces
It is 15, uniaxial direct tensile Strength co-mputation numerical value is averaged.
The loading velocity is 1mm/min.
Detailed step of the present invention is as follows:
1) mix-design for carrying out stabilized with inorganic binder material, determines gradation composition, optimum moisture content and inorganic knot
Close material dosage.
2) molding diameter height is than the stabilized with inorganic binder material cylinder test specimen for 1:2, stabilized with inorganic binder particulate material
Material and stabilized with inorganic binder in grain material diameter × highly be φ 100mm × 200mm, test specimen quantity be 9, inorganic combination
Expect stablize coarse material diameter × highly be φ 150mm × 300mm, test specimen quantity be 15.
3) test specimen in step 2) is placed in Standard Curing room health to regulation age.
4) 1d before providing age takes out test specimen from Standard Curing room, measures test specimen diameter D and height H.
5) it will be smoothed out at the top and bottom of test specimen using cement paste.
6) upper load plate is pasted at the top of test specimen using adhesive, lower load plate is pasted in the bottom of test specimen.
7) upper and lower each glutinous along the vertical direction on being located at the parallel lines that 3 deviation angles are 120 ° in the middle part of test specimen side
Paste a steel cap, steel cap spacing should be greater than gathering materials 4 times of maximum particle diameter.
8) 7) test specimen in is placed on sink and embezzles water for 24 hours, the water surface is made to be higher by test specimen top surface 25mm or more.
9) test specimen of full water for 24 hours is taken out from water, is placed in Material Testing Machine after drying with a cloth, by 3 straight line positions
Displacement sensor is respectively arranged between the steel cap in the parallel lines that 3 deviation angles are 120 ° in the middle part of test specimen side.
10) Material Testing Machine is connect with upper load plate, lower load plate is fixed on pedestal, adjusts linear displacement transducer
And reset, suitable loading speed is selected, tension test load is applied, until test specimen destroys.
11) using the drawing of computer record test specimen the tensile load F born during entire tension test and generation
Stretch displacement d.
12) elongation strain is calculated by formula (1).
In formula: ε --- elongation strain；
D --- stretching displacement (mm)；
H --- height of specimen (mm).
13) " load-strain " curve is drawn, as shown in figure 3, it is straight to obtain each test specimen according to " load-strain " curve
Meet the peak load Fr of tension test.
14) 0.3 times of peak load 0.3Fr and its corresponding strain stress are taken0.3, stretch modulus Et is calculated according to formula (2), use is whole
Number indicates.When " load-strain " origin of curve not 0 position or curve starting have slight concussion when, answer fair curve starting point
Make (ε0.3, 0.3Fr) point with revised (0,0) point line on curve be straight line.
In formula: Et--- stretch modulus (MPa)；
Fr--- maximum tension load (N)；
ε′0.3--- the revised ε of origin0.3, ε0.3Reach 0.3F for loadrWhen test specimen longitudinal strain.
D --- test specimen diameter (mm).
The present invention and the prior art test the splitting of stabilized with inorganic binder material stretch modulus using indirect stretching mode
Experiment is different, carrying out stretch modulus measurement in such a way that test specimen axially applies uniaxial direct tensile load, compared with diametral compression test,
The force modes of test specimen are more clear in the present invention, can more match stabilized with inorganic binder material in practical pavement structure
Tensile failure mode.The present invention is converted into load by the relationship between load and displacement using uniaxial direct tensile intensity experiment
Relationship between strain, thus maximum strain when being destroyed, it is contemplated that load intensity ratio be (finder charge and peak load
Ratio) be 0.2-0.4 when stabilized with inorganic binder material still in the linear elasticity stage, therefore take 0.3 times of peak load 0.3Fr and its
Corresponding strain stress0.3, stretch modulus E is directly calculated according to formula (2)t.Compared with other ground surface materials, inorganic binder is steady
Material is determined with particularity such as compression strength is big, tensile strength is small, deformability is weak, easy brittle failures, can not directly be mixed using pitch
The uniaxial direct tensile Modulus Test Method of material and cement concrete is closed, the present invention is proposed for the characteristics of stabilized with inorganic binder material
A kind of uniaxial direct tensile Modulus Test Method, the further perfect mechanical property test of stabilized with inorganic binder material can be
The revision of current Chinese code of practice provides certain reference and foundation.
Method of the invention can more directly reflect the modulus of stabilized with inorganic binder material, provide more for Pavement Structure Design
Direct reference data.
Detailed description of the invention
The connection schematic diagram (main view) of Fig. 1 test specimen during the experiment,
The connection schematic diagram (top view) of Fig. 2 test specimen during the experiment,
Fig. 3 " load-strain " curve
Each label lists as follows in figure:
1-test specimen, 2-lower load plates, 3-upper load plates, 4-connecting screws, 5-fixture nuts, 6-stretch rods, 7-
Steel cap, 8-fixed blocks, 9-receivers, 10-linear displacement transducers, 11-fixed screws, 12-bolts, 13- connecting rod；
Fig. 3 " load-strain " curve.
Specific embodiment
The present invention will be further described in detail below with reference to the embodiments.
Embodiment 1
By taking cement stabilized grading crushed stones as an example, illustrate the uniaxial direct tensile Modulus Test Method of stabilized with inorganic binder material
Embodiment.
1) it selects the cement stabilized grading crushed stones CBG25 gradation in table 1 to carry out modified compaction test, determines optimum moisture content
It is 5.5%, cement dose 6%.
1 cement stabilized grading crushed stones CBG25 gradation composition of table
| Sieve pore (mm) | 26.5 | 19 | 13.2 | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| Percent of pass (%) | 99.9 | 83.4 | 68.1 | 57.9 | 40.2 | 24.9 | 16.6 | 10.7 | 6.9 | 5.5 | 4.1 |
2) 15 diameter × height are formed according to the design result of step 1) for coarse material because of the CBG25 in step 1)
For the cylinder test specimen of φ 150mm × 300mm.
3) test specimen in step 2) is placed in Standard Curing room and carries out health, health age is 90d.
4) in 89d, test specimen is taken out from Standard Curing room, measures test specimen diameter and height.
5) it will be smoothed out at the top and bottom of test specimen using cement paste.
6) upper load plate 2 is pasted at the top of test specimen 1 using adhesive, lower load plate 3 is pasted in the bottom of test specimen 1.
7) upper and lower each glutinous along the vertical direction on being located at the parallel lines that 3 deviation angles are 120 ° in the middle part of test specimen side
Paste a U-shaped steel cap 7.Spacing between upper and lower steel cap 7 should be greater than gathering materials 4 times of maximum particle diameter.
8) 7) test specimen in is placed on sink and embezzles water for 24 hours.
9) test specimen of full water for 24 hours is taken out from water, is placed in Material Testing Machine after drying with a cloth, by 3 straight line positions
Displacement sensor 10 is respectively arranged between the steel cap in the parallel lines that 3 deviation angles are 120 ° in the middle part of test specimen side.
The linear displacement transducer includes the receiver 9 and fixed block 8 at 13 both ends of connecting rod, and the receiver 9 is clamped
It is fixedly connected in lower U-shaped steel cap 7 and by fixed screw 11 with lower steel cap 7, the fixed block 8 is moved up and down along connecting rod 13
Connecting rod 13 is simultaneously fixedly connected by the position of supreme steel cap 7 by bolt 12 with fixed block 8, and the fixed block 8 is connected in U-shaped steel
It is in cap 7 and fixed by fixed screw 11 with upper steel cap 7.
As shown in Figure 1, 2.
10) stretch rod 6 of Material Testing Machine is connected by fixture nut 5 with one end of connecting screw 4, connecting screw 4
The other end is connect by fixture nut 5 with upper load plate 2, and lower load plate is fixed on pedestal.Adjust linear displacement transducer simultaneously
It resets, applies the tension test load of 1mm/min, until test specimen destroys.
11) using the stretching of computer record the test specimen tensile load born during entire tension test and generation
Displacement.
12) elongation strain is calculated
13) " load-strain " curve is drawn, the maximum lotus of direct tensile test is obtained according to " load-strain " curve
It carries.As shown in Figure 3.
14) 0.3 times of peak load 0.3Fr and its corresponding strain stress are taken0.3, stretch modulus Et is calculated, the results are shown in Table 2.
2 uniaxial direct tensile modulus test result of table
| Test specimen number | 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) available by table 2, the uniaxial direct tensile modulus averages of cement stabilized grading crushed stones CBG25 are as follows: 858MPa,
Standard deviation are as follows: 64MPa, the coefficient of variation are as follows: 7.5%, the uniaxial direct tensile modulus typical value under 95% fraction are as follows: 858MPa-
1.645 × 64MPa=752MPa.
The uniaxial direct tensile modulus that cement stabilized grading crushed stones CBG25 can be measured by testing using the present invention, can be road
Design material parameter corresponding with structural analysis offer in face.
Claims (10)
1. a kind of stabilized with inorganic binder material uniaxial direct tensile Modulus Test Method, including following sequential steps:
(1) shaping inorganic binder stabilizing material cylinder test specimen, health 90 or 180 days, health is to advising in Standard Curing room
Determine the previous day of age, measures cylinder test specimen diameter；
(2) upper load plate to be pasted at the top of test specimen using adhesive, lower load plate is pasted in the bottom of test specimen,
(3) it takes out and dries after test specimen being satisfied water health 24 hours, 3 or 3 or more linear displacement transducers are individually fixed in examination
Part side medium position, linear displacement transducer is radially angularly distributed in cylinder test specimen, and linear displacement transducer measures
Direction of displacement is the short transverse of cylinder test specimen；
(4) Material Testing Machine is connect with upper load plate, lower load plate is fixed on pedestal, and adjusting linear displacement transducer is simultaneously clear
Zero, loading speed is selected, tension test load is applied, until test specimen destroys；
(5) the stretching displacement d of the test specimen tensile load F born during entire tension test and generation are recorded；
(6) elongation strain is calculated by formula (1),
In formula: ε --- elongation strain；
D --- stretching displacement (mm)；
H --- height of specimen (mm)；
(7) " load-strain " curve is drawn, each test specimen direct tensile test is obtained most according to " load-strain " curve
Big load Fr；
(8) 0.3 times of peak load 0.3Fr and its corresponding strain stress are taken0.3, stretch modulus Et is calculated according to formula (2), uses integer table
Show；
In formula: Et--- stretch modulus (MPa)；
Fr--- maximum tension load (N)；
ε′0.3--- the revised ε of origin0.3, ε0.3Reach 0.3F for loadrWhen test specimen longitudinal strain.
D --- test specimen diameter (mm).
2. test method according to claim 1, the starting point of " load-strain " curve is not in 0 position or curve
When starting has slight concussion, fair curve starting point makes (ε0.3, 0.3Fr) point with revised (0,0) point line be straight on curve
Line.
3. test method according to claim 1 or 2, the linear displacement transducer includes the receiver at connecting rod both ends
And fixed block, the receiver and fixed block are fixed on test specimen side vertical face position above and below.
4. test method according to claim 3, the test specimen is satisfied before water, in the upper and lower each vertical positive contraposition of surface of test piece
It sets and pastes a U-shaped steel cap, the spacing between upper and lower U-shaped steel cap should be greater than gathering materials 4 times of maximum particle diameter, the receiver card
It is connected in lower U-shaped steel cap and is fixedly connected by fixed screw with lower steel cap, the fixed block moves up and down supreme U along connecting rod
Shape steel cap position is simultaneously fixedly connected with connecting rod with fixed block by bolt, the fixed block be connected in U-shaped steel cap and with it is upper
Steel cap is fixed by fixed screw.
5. test method according to claim 1, there are three the linear displacement transducers is distributed in the middle part of test specimen side,
It in test specimen is radially in 120 ° of angles between each linear displacement transducer.
6. test method according to claim 1, the full water in the step (3) is to put test specimen to impregnate in the sink
For 24 hours, so that the water surface is higher by test specimen top surface 25mm or more, will be smeared at the top and bottom of test specimen before the step (2) using cement paste
It is flat.
7. test method according to claim 1, moisture content 4- in the stabilized with inorganic binder material cylinder test specimen
7%, cement content 4-6%, other is rubble.
8. test method according to claim 7, the stabilized with inorganic binder material medium stone is fine material, middle grain
Material or coarse material, the cylinder test specimen diameter × height are respectively φ 100mm × 200mm, φ 100mm × 200mm, φ
150mm×300mm。
9. test method according to claim 8, the stabilized with inorganic binder material medium stone is fine material, middle grain
Material, preparing number of test-pieces is 9, and uniaxial direct tensile Strength co-mputation numerical value is averaged；In the stabilized with inorganic binder material
Rubble is that prepare number of test-pieces be 15 to coarse material, and uniaxial direct tensile Strength co-mputation numerical value is averaged.
10. test method according to claim 1, the loading velocity is 1mm/min.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110618033A (en) * | 2019-09-26 | 2019-12-27 | 同济大学 | Testing device and testing method for tensile property of road material |
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| CN102879266A (en) * | 2012-09-17 | 2013-01-16 | 山东省交通科学研究所 | Method for testing uniaxial compression elasticity modulus of inorganic binder stabilizing material |
| CN105588761A (en) * | 2016-03-10 | 2016-05-18 | 山东大学 | Test device and test method for measuring elasticity modulus of geosynthetic material |
| CN106706422A (en) * | 2016-11-17 | 2017-05-24 | 长沙理工大学 | Method and device for synchronously testing tension, compression and split resilience moduli of pavement material |
| CN107748106A (en) * | 2017-09-30 | 2018-03-02 | 交通运输部公路科学研究所 | A kind of asphalt stretches dynamic modulus method of testing |
| JP2019070533A (en) * | 2017-10-05 | 2019-05-09 | 株式会社東日製作所 | Auxiliary component for tension applying device |
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2019
- 2019-05-13 CN CN201910393166.7A patent/CN110057673B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102879266A (en) * | 2012-09-17 | 2013-01-16 | 山东省交通科学研究所 | Method for testing uniaxial compression elasticity modulus of inorganic binder stabilizing material |
| CN105588761A (en) * | 2016-03-10 | 2016-05-18 | 山东大学 | Test device and test method for measuring elasticity modulus of geosynthetic material |
| CN106706422A (en) * | 2016-11-17 | 2017-05-24 | 长沙理工大学 | Method and device for synchronously testing tension, compression and split resilience moduli of pavement material |
| CN107748106A (en) * | 2017-09-30 | 2018-03-02 | 交通运输部公路科学研究所 | A kind of asphalt stretches dynamic modulus method of testing |
| JP2019070533A (en) * | 2017-10-05 | 2019-05-09 | 株式会社東日製作所 | Auxiliary component for tension applying device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110618033A (en) * | 2019-09-26 | 2019-12-27 | 同济大学 | Testing device and testing method for tensile property of road material |
| CN110618033B (en) * | 2019-09-26 | 2021-12-31 | 同济大学 | Testing device and testing method for tensile property of road material |
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