CN110031309A - A kind of stabilized with inorganic binder material uniaxial direct tensile strength test method - Google Patents
A kind of stabilized with inorganic binder material uniaxial direct tensile strength test method Download PDFInfo
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- CN110031309A CN110031309A CN201910392972.2A CN201910392972A CN110031309A CN 110031309 A CN110031309 A CN 110031309A CN 201910392972 A CN201910392972 A CN 201910392972A CN 110031309 A CN110031309 A CN 110031309A
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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 strength 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, pass through the tensile loads of testing machine, load-displacement is obtained, obtains maximum tension load when test specimen destroys, and uniaxial direct tensile intensity Rt is calculated.Method of the invention can more directly reflect the tensile strength 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 of stabilized with inorganic binder material is strong
Spend test 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 tensile strength, but due to being lacked in the existing stabilized with inorganic binder testing of materials regulation in China
Few uniaxial direct tensile strength test method, when Pavement Design, can only be using the intensity 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 strength 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 strength test method,
For obtaining the uniaxial direct tensile intensity of stabilized with inorganic binder material, the intensity results than existing Indirect Tensile Tests can more be connect
Nearly true tensile strength.
A kind of stabilized with inorganic binder material uniaxial direct tensile strength 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, note are recorded
Record " load-displacement " curve；
(6) the peak load F of each test specimen direct tensile test is obtained according to " load-displacement " curver, based on formula (1)
Calculate the uniaxial direct tensile intensity R of each test speciment；
In formula: Rt--- uniaxial direct tensile intensity (MPa)；
Fr--- maximum tension load (N)；
D --- test specimen diameter (mm).
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 be fixedly connected with lower steel cap, the fixed block along connecting rod move up and down supreme steel cap position and by bolt make fixed block and
Connecting rod is fixedly connected, and the fixed block is connected in U-shaped steel cap and is fixed with upper steel cap by fixed screw.
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.
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.
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 operating procedures of the present invention are 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.
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, adjust linear displacement transducer and reset, select suitable load
Rate applies tension test load, until test specimen destroys.
11) the tensile load F born during entire tension test using computer record test specimenrWith the drawing of generation
Displacement d is stretched, records " load-displacement " curve, as shown in Figure 3.
12) the peak load F of each test specimen direct tensile test is obtained according to " load-displacement " curver, based on formula (1)
Calculate the uniaxial direct tensile intensity R of each test speciment, retain to 2 significant digits.
In formula: Rt--- uniaxial direct tensile intensity (MPa)；
Fr--- maximum tension load (N)；
D --- test specimen diameter (mm).
The present invention and the prior art measure the splitting of stabilized with inorganic binder tensile strength of material using indirect stretching mode
Experiment is different, carrying out stretching strength determination 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 spilt test of the prior art can only obtain indirect tensile strength, need through theoretical calculation and experience
Indirect tensile strength is converted uniaxial direct tensile intensity by formula, and the present invention is closed by the direct ratio between tensile load and tensile strength
System, can acquire uniaxial direct tensile intensity using maximum tension load is obtained in test, avoid in spilt test to stretch indirectly
Intensity is converted into error propagation when uniaxial direct tensile intensity.Compared with other ground surface materials, stabilized with inorganic binder material has
The particularity such as compression strength is big, tensile strength is small, deformability is weak, easy brittle failure can not directly use asphalt and cement
The characteristics of uniaxial direct tensile strength test method of concrete, the present invention is directed to stabilized with inorganic binder material, proposes a kind of direct
Tensile strength test method, the further perfect mechanical property test of stabilized with inorganic binder material, can be the existing rule in China
The revision of model provides certain reference and foundation.
Method of the invention can more directly reflect the tensile strength of stabilized with inorganic binder material, mention for Pavement Structure Design
For more direct reference data.
Detailed description of the invention
The connection schematic diagram (main view) of Fig. 1 test specimen during the test,
The connection schematic diagram (top view) of Fig. 2 test specimen during the test,
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-displacement " 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 strength 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.
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, the spacing between upper and lower steel cap 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 10 includes the receiver 9 and fixed block 8 positioned at 13 both ends of connecting rod, the receiver
9 are connected in lower U-shaped steel cap 7 and are fixedly connected by fixed screw 11 with lower steel cap 7, mobile 87, supreme steel cap of fixed block
Set, be fixedly connected with connecting rod 13 with fixed block 8 by bolt 12, by fixed block 8 be connected in U-shaped steel cap 7 and with upper steel cap 7
It is fixed by fixed screw 11.
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 records " load-displacement " curve.See Fig. 3.
12) peak load of direct tensile test is obtained according to " load-displacement " curve, calculates uniaxial direct tensile intensity, knot
Fruit is shown in Table 2.
2 uniaxial direct tensile strength test results of table
| Test specimen number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
| Intensity/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) available by table 2, the uniaxial direct tensile average strength of cement stabilized grading crushed stones CBG25 are as follows: 1.11MPa,
Standard deviation are as follows: 0.09MPa, the coefficient of variation are as follows: 8.1%, belong to low Deflection level.Uniaxial direct tensile intensity generation under 95% fraction
Tabular value are as follows: 1.11MPa-1.645 × 0.09MPa=0.96MPa.
The uniaxial direct tensile intensity 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 strength 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 for recording the test specimen tensile load F born during entire tension test and generation, records " lotus
Load-displacement " curve；
(6) the peak load Fr of each test specimen direct tensile test is obtained according to " load-displacement " curve, is calculated by formula (1) every
The uniaxial direct tensile intensity Rt of a test specimen；
In formula: Rt--- uniaxial direct tensile intensity (MPa)；
Fr--- maximum tension load (N)；
D --- test specimen diameter (mm).
2. test method according to claim 1, the linear displacement transducer includes the reception positioned at connecting rod both ends
Device and fixed block, the receiver and link block are fixed on test specimen side vertical face position above and below.
3. test method according to claim 2, 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 the connecting rod 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.
4. 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.
5. 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, the water surface is made to be higher by test specimen top surface 25mm or more.
6. test method according to claim 1, the step (2) before will test specimen top and bottom using cement paste
It smoothes out.
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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| 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 |
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2019
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Patent Citations (4)
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|---|---|---|---|---|
| JPH09264829A (en) * | 1996-03-29 | 1997-10-07 | Japan Tobacco Inc | Detection method for rupture point in material testing machine |
| 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 |
| CN106769475A (en) * | 2017-01-13 | 2017-05-31 | 黑龙江工程学院 | A kind of method for evaluating semi-rigid sub-base material frost resistance using dynamic compression rebound modulu |
| 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 |
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| Title |
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| 交通部公路科学研究院主编: "《中华人民共和国行业标准 JTG E51-2009公路工程无机结合料稳定材料试验规程》", 15 October 2009, 人民交通出版社 * |
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Application publication date: 20190719 |