CN110057672A - A kind of stabilized with inorganic binder MATERIALS ' DYNAMIC uniaxial direct tensile modulus of resilience test method - Google Patents

A kind of stabilized with inorganic binder MATERIALS ' DYNAMIC uniaxial direct tensile modulus of resilience test method Download PDF

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CN110057672A
CN110057672A CN201910392967.1A CN201910392967A CN110057672A CN 110057672 A CN110057672 A CN 110057672A CN 201910392967 A CN201910392967 A CN 201910392967A CN 110057672 A CN110057672 A CN 110057672A
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test specimen
load
test
direct tensile
resilience
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周兴业
王旭东
刘晋周
金海兵
蔡雷
单伶燕
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Research Institute of Highway Ministry of Transport
China Road and Bridge Corp
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Research Institute of Highway Ministry of Transport
China Road and Bridge Corp
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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

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Abstract

The present invention relates to a kind of stabilized with inorganic binder MATERIALS ' DYNAMIC uniaxial direct tensile modulus of resilience test methods, belong to highway material testing field.The present invention is tested using uniaxial direct tensile, by the proportional relation between tensile load and tensile strength, obtains in test maximum tension load；Use direct maximum tension load numerical value classification number with Haversine waveform dynamic action in test specimen, record load crest value and load valley value, the maximum distortion and minimal deformation of corresponding moment displacement sensor are acquired simultaneously, draw " deformation-load " curve, fitting obtains One- place 2-th Order function, then the dynamic uniaxial direct tensile modulus of resilience is obtained by calculation.Method of the invention can more directly reflect the dynamic uniaxial direct tensile modulus of resilience, provide more direct reference data for Pavement Structure Design.

Description

A kind of stabilized with inorganic binder MATERIALS ' DYNAMIC uniaxial direct tensile modulus of resilience test method
Technical field
The present invention relates to technical field of road engineering, in particular to a kind of dynamic of stabilized with inorganic binder material is directly drawn Stretch modulus of resilience 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 Binder stabilizing material stretches the important method of the modulus of resilience, but due to the existing stabilized with inorganic binder testing of materials regulation in China In lack uniaxial direct tensile modulus of resilience test method, when Pavement Design, can only be using Indirect Tensile Tests such as splitting or bend tests Modulus of resilience result replace, will lead to design result and relatively large deviation occur.Further, since stabilized with inorganic binder material Particularity can not directly use the uniaxial direct tensile modulus of resilience test method of asphalt and cement concrete, need to be directed to The characteristics of stabilized with inorganic binder material, which restudies, proposes corresponding test method.
Summary of the invention
In view of the above-mentioned problems, the invention proposes a kind of examinations of stabilized with inorganic binder MATERIALS ' DYNAMIC uniaxial direct tensile modulus of resilience Proved recipe method, using dynamically load mode, for obtaining the stretching modulus of resilience of stabilized with inorganic binder material.
A kind of dynamic uniaxial direct tensile modulus of resilience test method of stabilized with inorganic binder material, including following sequence walk It is rapid:
(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 displacement sensors are individually fixed in examination Part side medium position obtains test specimen to be measured, and displacement sensor is radially angularly distributed in cylinder test specimen, and displacement sensor Measure the short transverse that direction of displacement is cylinder test specimen；
(4) the uniaxial direct tensile intensity of stabilized with inorganic binder material is determined
1) Material Testing Machine is connect with the upper load plate of test specimen to be measured, lower load plate is fixed on pedestal, adjusts displacement Sensor is simultaneously reset, and selects loading speed, applies tension test load, until test specimen destroys；
2) the stretching displacement d of the test specimen tensile load F born during entire tension test and generation, record are recorded " load-displacement " curve；
3) the peak load Fr of test specimen direct tensile test is obtained according to " load-displacement " curve；
In formula: Rt--- uniaxial direct tensile intensity (MPa)；
Fr--- maximum tension load (N)；
D --- test specimen diameter (mm)；
(5) the stabilized with inorganic binder MATERIALS ' DYNAMIC uniaxial direct tensile modulus of resilience is measured
1. separately takes test specimen to be measured, Material Testing Machine is connect with the upper load plate of the test specimen to be measured, lower load plate is fixed on On pedestal, adjusts displacement sensor and resets,
2. is from zero to FrBetween take different value as the finder charge series tested as the dynamic uniaxial direct tensile modulus of resilience Value；
3. treats test block and carries out Haversine waveform dynamic loads, finder charge value of series adds step by step from low to high It carries, Non-intermittent between each level, Loading frequency 10Hz, the last 1s of every grade of load acquire load crest value and load trough Value, while acquiring the maximum distortion and minimal deformation of corresponding moment displacement sensor；
4. calculates separately actual loading and practical distortion under every grade of load action using formula (2) and formula (3)；
P=Pmax-Pmin (2)
l0=lmax-lmin (3)
In formula: P --- actual loading mean value (N)；
l0--- practical distortion mean value (mm)；
Pmax--- load crest value mean value (N)；
Pmin--- load valley value mean value (N)；
lmax--- maximum distortion mean value (mm)；
lmin--- minimal deformation mean value (mm)；
5. is using actual loading mean value as abscissa, using practical distortion mean value as ordinate, it is bent to draw " deformation-load " Line,
6. is fitted the curve using the One- place 2-th Order function in formula (4).
l0=aP2+bP+c (4)
In formula: a, b, c --- regression parameter；
7. calculates the dynamic uniaxial direct tensile modulus of resilience using formula (5)
In formula:--- the dynamic uniaxial direct tensile modulus of resilience (MPa)；
Fr--- the peak load (N) of direct tensile test；
H --- height of specimen (mm)；
D --- test specimen diameter (mm).
There is multiple test specimen to be measured in the step (4), obtain test specimen direct tensile test according to " load-displacement " curve Peak load it is averageThe step 2. in tension test load be from zero toBetween different value；The step (5) In test specimen to be measured have multiple, the dynamic uniaxial direct tensile modulus of resilience is calculated as average value.
The step 2. in finder charge value of series be respectively
Every grade of number of loading is 200 times, the last 1s of every grade of load, acquires the lotus of continuous 10 loaded cycles Carrier peak value and load valley value, while acquiring the maximum distortion and minimal deformation of corresponding moment displacement sensor；By formula (2), (3) actual loading mean value and practical distortion mean value are acquired.
Institute's displacement sensors include the receiver and fixed block at connecting rod both ends, and the receiver and fixed block are 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, the fixed block along connecting rod move up and down supreme steel cap position and by bolt by connecting rod and Fixed block is fixedly connected, and the fixed block is connected in U-shaped steel cap and is fixed with upper steel cap by fixed screw.
There are three institute's displacement sensors is distributed in the middle part of test specimen side, is radially in test specimen between each displacement sensor 120 ° of angles.
It will be smoothed out at the top and bottom of test specimen before the step (2) using cement paste, the full water in the step (3) is Test specimen is put and is impregnated in the sink for 24 hours, the water surface is made to be higher by test specimen top surface 25mm or more.
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, portion Test specimen is divided to be used for uniaxial direct tensile strength test, another part is tested for the dynamic uniaxial direct tensile modulus of resilience；The inorganic combination Material stabilizing material medium stone is that prepare number of test-pieces be 15 to coarse material, and part test specimen is used for uniaxial direct tensile strength test, separately A part is tested for the dynamic uniaxial direct tensile modulus of resilience.
The present invention and the prior art are stretched using indirect stretching mode test stabilized with inorganic binder MATERIALS ' DYNAMIC springs back mould The spilt test of amount is different, carrying out stretch modulus measurement in such a way that test specimen axially applies uniaxial direct tensile load, with splitting Test is compared, and the force modes of test specimen are more clear in the present invention, can more match stabilized with inorganic binder material in reality Tensile failure mode in pavement structure.The present invention is tested using uniaxial direct tensile, by between tensile load and tensile strength Proportional relation obtains in test maximum tension load；Use direct maximum tension load numerical value classification number with Haversine wave Shape dynamic action records load crest value and load valley value in test specimen, while acquiring the maximum of corresponding moment displacement sensor Deformation and minimal deformation draw " deformation-load " curve, and fitting obtains One- place 2-th Order function, then dynamic is obtained by calculation directly Connect the stretching modulus of resilience.Compared with other ground surface materials, stabilized with inorganic binder material big, tensile strength with compression strength The particularity such as small, deformability is weak, easy brittle failure can not directly be sprung back using the uniaxial direct tensile of asphalt and cement concrete The characteristics of Modulus Test Method, the present invention is directed to stabilized with inorganic binder material, proposes a kind of uniaxial direct tensile modulus of resilience test Method, the further perfect mechanical property test of stabilized with inorganic binder material can be the revision of current Chinese code of practice Certain reference and foundation are provided.
Method of the invention can more directly reflect the dynamic uniaxial direct tensile modulus of resilience, provide more directly for Pavement Structure Design Reference data.
Detailed description of the invention
Fig. 1 test specimen connection schematic diagram (main view) in testing,
Fig. 2 test specimen connection schematic diagram (top view) in testing,
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-displacement sensors, 11-fixed screws, 12-bolts, 13- connecting rod；
Fig. 3 " load-displacement " curve
The continuous Haversine waveform dynamic loads of Fig. 4
Fig. 5 " deformation-load " curve
Specific embodiment
The present invention will be further described in detail below with reference to the embodiments.
By taking cement stabilized grading crushed stones as an example, illustrate that the stabilized with inorganic binder MATERIALS ' DYNAMIC uniaxial direct tensile modulus of resilience is tested The embodiment of method.
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
2) cylinder test specimen that 15 diameters × highly are φ 150mm × 300mm is formed.
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 3 is pasted at the top of test specimen 1 using adhesive, lower load plate 2 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 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, 3 displacements are passed 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.
Institute's displacement sensors include the receiver 9 and fixed block 8 at 13 both ends of connecting rod, and the receiver 9 is connected in lower U It is fixedly connected in shape steel cap 7 and by fixed screw 11 with lower steel cap 7, the fixed block 8 moves up and down supreme along connecting rod 13 Connecting rod 13 is simultaneously fixedly connected by 7 position of steel cap by bolt 12 with fixed block 8, and the fixed block 8 is connected in and U-shaped steel cap 7 It is interior and fixed by fixed screw 11 with upper steel cap 7.As shown in Figure 1, 2.
10) peak load of the direct tensile test of cement stabilized grading crushed stones CBG25 is determined.
1. randomly selects 6 test specimens and carries out direct tensile test,
2. the 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 3, and lower load plate 2 is fixed on pedestal.Adjusting displacement sensor is simultaneously clear Zero, apply the tension test load of 1mm/min, until test specimen destroys.
3. is using the drawing of computer record test specimen the tensile load F born during entire tension test and generation Displacement d is stretched, records " load-displacement " curve, as shown in Figure 3.
4. obtains the peak load of each test specimen direct tensile test according to " load-displacement " curve, it the results are shown in Table 2.
2 direct tensile test peak load result summary sheet of table
5. calculates the peak load average value of 6 test specimen direct tensile tests
10) the dynamic uniaxial direct tensile modulus of resilience of cement stabilized grading crushed stones CBG25 is determined.
1. optional one from remaining 9 test specimens,
2. connects Material Testing Machine and the upper load plate of test specimen, lower load plate is fixed on pedestal.Adjust displacement sensing Device is simultaneously reset.
3. takes 1581N, 3163N, 4743N, 6326N, 7908N, 9490N as the examination of the dynamic uniaxial direct tensile modulus of resilience Test load.
4. applies Haversine waveform dynamic loads to test specimen.Totally 6 grades of load level (1581N, 3163N, 4743N, 6326N, 7908N, 9490N), load numerical value multistage loadings from low to high, Non-intermittent between each level, Loading frequency 10Hz, Every grade of number of loading is 200 times.See Fig. 4
5. the last 1s of every grade of load of acquires the load crest value and load valley value of continuous 10 loaded cycles, simultaneously Acquire the maximum distortion and minimal deformation of corresponding moment displacement sensor.
6. using formula (2) and formula (3) calculate separately step 5. in reality in lower 10 loaded cycles of every grade of load action Load mean value and practical distortion mean value.
7. is using actual loading mean value as abscissa, using practical distortion mean value as ordinate, it is bent to draw " deformation-load " Line.See Fig. 5.
8. using the One- place 2-th Order function in formula (4) to step 7. in curve be fitted, fitting parameter are as follows: a=- 7.498×10-10, b=1.643 × 10-3, c=7.506 × 10-3。
9. calculates the dynamic uniaxial direct tensile modulus of resilience using formula (5)
10. 1. 9. determines the dynamic uniaxial direct tensile modulus of resilience of remaining 8 test specimen according to step to step, it is shown in Table 3. Calculate the average value of 9 test specimen dynamic uniaxial direct tensile moduluses of resilienceStandard deviation are as follows: 94MPa, the coefficient of variation are as follows: 8.3%, belong to low Deflection level.Dynamic uniaxial direct tensile modulus of resilience typical value under 95% fraction are as follows: 1128MPa-1.645 × 94MPa=974MPa.
The dynamic uniaxial direct tensile rebound mould of cement stabilized grading crushed stones CBG25 can be measured by testing using the present invention Amount, can provide corresponding material parameter with structural analysis for Pavement Design.
3 dynamic uniaxial direct tensile modulus of resilience test result of table

Claims (10)

1. a kind of dynamic uniaxial direct tensile modulus of resilience test method of stabilized with inorganic binder material, 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 displacement sensors are individually fixed in test specimen side Middle face position obtains test specimen to be measured, and displacement sensor is radially angularly distributed in cylinder test specimen, and displacement sensor measures Direction of displacement is the short transverse of cylinder test specimen；
(4) the uniaxial direct tensile intensity of stabilized with inorganic binder material is determined
1) Material Testing Machine is connect with the upper load plate of test specimen to be measured, lower load plate is fixed on pedestal, adjusts displacement sensing Device is simultaneously reset, and selects loading speed, applies tension test load, until test specimen destroys；
2) the stretching displacement d for recording the test specimen tensile load F born during entire tension test and generation, records " lotus Load-displacement " curve；
3) the peak load Fr of test specimen direct tensile test is obtained according to " load-displacement " curve；
In formula: Rt--- uniaxial direct tensile intensity (MPa)；
Fr--- maximum tension load (N)；
D --- test specimen diameter (mm)；
(5) the stabilized with inorganic binder MATERIALS ' DYNAMIC uniaxial direct tensile modulus of resilience is measured
1. separately takes test specimen to be measured, Material Testing Machine is connect with the upper load plate of the test specimen to be measured, lower load plate is fixed on pedestal On, it adjusts displacement sensor and resets,
2. is from zero to FrBetween take different value as the finder charge value of series tested as the dynamic uniaxial direct tensile modulus of resilience；
3. treats test block and carries out Haversine waveform dynamic loads, multistage loadings are at different levels from low to high for finder charge value of series Non-intermittent between position, Loading frequency 10Hz, the last 1s of every grade of load acquire load crest value and load valley value, simultaneously Acquire the maximum distortion and minimal deformation of corresponding moment displacement sensor；
4. calculates separately actual loading and practical distortion under every grade of load action using formula (2) and formula (3)；
P=Pmax-Pmin (2)
l0=lmax-lmin (3)
In formula: P --- actual loading mean value (N)；
l0--- practical distortion mean value (mm)；
Pmax--- load crest value mean value (N)；
Pmin--- load valley value mean value (N)；
lmax--- maximum distortion mean value (mm)；
lmin--- minimal deformation mean value (mm)；
5. is using actual loading mean value as abscissa, using practical distortion mean value as ordinate, " deformation-load " curve is drawn,
6. is fitted the curve using the One- place 2-th Order function in formula (4).
l0=aP2+bP+c (4)
In formula: a, b, c --- regression parameter；
7. calculates the dynamic uniaxial direct tensile modulus of resilience using formula (5)
In formula:--- the dynamic uniaxial direct tensile modulus of resilience (MPa)；
Fr--- the peak load (N) of direct tensile test；
H --- height of specimen (mm)；
D --- test specimen diameter (mm).
2. according to the method described in claim 1, in the step (4) test specimen to be measured have it is multiple, according to " load-displacement " song The peak load that line obtains test specimen direct tensile test is averageThe step 2. in finder charge value of series be from zero to Between different value；There is multiple test specimen to be measured in the step (5), the dynamic uniaxial direct tensile modulus of resilience is calculated as average value.
3. according to the method described in claim 2, the step 2. in finder charge value of series be respectively
4. the last 1s of every grade of load is adopted according to the method described in claim 3, every grade of number of loading is 200 times Collect the load crest value and load valley value of continuous 10 loaded cycles, while acquiring the maximum of corresponding moment displacement sensor and becoming Shape and minimal deformation；Actual loading mean value and practical distortion mean value are acquired by formula (2), (3).
5. according to the method described in claim 1, institute's displacement sensors include the receiver and fixed block at connecting rod both ends, institute It states receiver and fixed block is fixed on test specimen side vertical face position above and below.
6. glutinous in the upper and lower each vertical face position of surface of test piece according to the method described in claim 5, the test specimen is satisfied before water Paste 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, and the receiver is connected in It is fixedly connected in lower U-shaped steel cap and by fixed screw with lower steel cap, the fixed block moves up and down supreme steel cap along connecting rod Connecting rod is simultaneously fixedly connected by position by bolt with fixed block, and the fixed block is connected in U-shaped steel cap and leads to upper steel cap Fixed screw is crossed to fix.
7. each displacement passes according to the method described in claim 1, institute's displacement sensors are there are three being distributed in the middle part of test specimen side It in test specimen is radially in 120 ° of angles between sensor.
8. according to the method described in claim 1, will be smeared at the top and bottom of test specimen before the step (2) using cement paste Flat, the full water in the step (3) is to put test specimen to impregnate in the sink for 24 hours, and the water surface is made to be higher by test specimen top surface 25mm or more.
9. according to the method described in claim 1, moisture content 4-7% in the stabilized with inorganic binder material cylinder test specimen, Cement content 4-6%, other is rubble.
10. according to the method described in claim 9, the stabilized with inorganic binder material medium stone is fine material, middle grain material Material, the cylinder test specimen diameter × it is highly φ 100mm × 200mm, preparing number of test-pieces is 9, and part test specimen is for straight Tensile strength test is connect, another part is tested for the dynamic uniaxial direct tensile modulus of resilience；In the stabilized with inorganic binder material Rubble is coarse material, the cylinder test specimen diameter × it is highly φ 150mm × 300mm, preparing number of test-pieces is 15, portion Test specimen is divided to be used for uniaxial direct tensile strength test, another part is tested for the dynamic uniaxial direct tensile modulus of resilience.
CN201910392967.1A 2019-05-13 2019-05-13 A kind of stabilized with inorganic binder MATERIALS ' DYNAMIC uniaxial direct tensile modulus of resilience test method Pending CN110057672A (en)

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Application publication date: 20190726