CN107449656A - A kind of concrete static modulus of elasticity measuring method - Google Patents
A kind of concrete static modulus of elasticity measuring method Download PDFInfo
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- CN107449656A CN107449656A CN201710554838.9A CN201710554838A CN107449656A CN 107449656 A CN107449656 A CN 107449656A CN 201710554838 A CN201710554838 A CN 201710554838A CN 107449656 A CN107449656 A CN 107449656A
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0012—Constant speed test
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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Abstract
The present invention discloses a kind of concrete static modulus of elasticity measuring method, comprises the following steps：Step 1, standard cube test specimen is made in the concrete of modulus of elasticity to be determined, using the test specimen as drawing experiment test specimen is split, design age is arrived by test requirements document maintenance；Step 2, precompressed is carried out to test specimen, until adjacent center line transversely deforming value difference twice meets the requirements；Step 3, formal test is carried out to test specimen, loading speed is identical with precompressed, when loading stress reaches the 50% of split tensile strength, records the center line transversely deforming value under load and the load now；Step 4, using the deformation values in step 3 as horizontal total deformation, modulus of elasticity of concrete is calculated.The precision of such a measuring method is higher, and easy to operate.
Description
Technical field
The invention belongs to concrete strength field of measuring technique, test measurement elasticity is drawn in splitting for more particularly to a kind of concrete
Modulus measuring method.
Background technology
In practical implementation, the Con trolling index of concrete, often will also be to concrete in addition to intensity and the slump
Modulus of elasticity provided.Particularly, the temperature stress under to high-strength concrete and mass concrete and crack
When extension, deformation are calculated, it is required to determine the modulus of elasticity of its corresponding concrete.
At present, modulus of elasticity of concrete is tested using standard prism test specimen, it is necessary to using large-tonnage testing machine, behaviour
Make complicated, it is desirable to finely control loaded value and to hold the lotus time longer, high is required to performance accuracy, time cost is high.And split drawing examination
Modulus of elasticity of concrete can be determined while split tensile strength is obtained by testing, and be easy to test operation using cube specimen, be made
It can be guaranteed with small tonnage testing machine loading accuracy, save time cost.
The content of the invention
The purpose of the present invention, it is to provide a kind of concrete static modulus of elasticity measuring method, its precision is higher, and operates
It is easy.
In order to reach above-mentioned purpose, solution of the invention is：
A kind of concrete static modulus of elasticity measuring method, comprises the following steps：
Step 1, standard cube test specimen is made in the concrete of modulus of elasticity to be determined, is tested using the test specimen as drawing is split
Test specimen, design age is arrived by test requirements document maintenance；
Step 2, precompressed is carried out to test specimen, until adjacent center line transversely deforming value difference twice meets the requirements；
Step 3, formal test is carried out to test specimen, loading speed is identical with precompressed, and loading stress reaches split tensile strength
When 50%, the center line transversely deforming value under load and the load now is recorded；
Step 4, using the deformation values in step 3 as horizontal total deformation, modulus of elasticity of concrete is calculated.
In above-mentioned steps 1, the size of standard cube test specimen is 150mm × 150mm × 150mm, the step 2 it is detailed
Content is:Test specimen is placed on to the center of the lower platen of pressure testing machine, steel pad is placed between upper lower platen and test specimen
Block, between cushion block and test specimen place three-ply board filler strip, slowly reduce forcing press top board, with test specimen it is close when adjustment ball seat make to connect
Touch uniform；Then start pressure testing machine, slowly apply pressure, precompressed is carried out, with 0.04MPa/s~0.06MPa/s speed
Continuously equably load, maximum compressive pre-stress is the 40% of test specimen split tensile strength, and precompressed repeatedly three times, becomes twice until adjacent
Shape value difference is no more than 0.003mm, otherwise continues precompressed, until difference reaches requirement.
The width of above-mentioned filler strip is 20mm, thickness 3-4mm.
In above-mentioned steps 3, by arranging that Light deformation determines perpendicular to loading direction in the symmetric side center position of test specimen two
Instrument measures horizontal total deformation.
In above-mentioned steps 4, modulus of elasticity of concrete is calculated using following formula：
In formula, E is modulus of elasticity of concrete, and P splits drawing failing load for 50%, and Δ L is horizontal total deformation, and D is test specimen
The length of side, v are Poisson's ratio.
In the above method, 3 test specimens are made in step 1,2-4 is respectively repeated steps, obtains 3 modulus of elasticity numerical value,
The end value averaged as modulus of elasticity of concrete.
After such scheme, the present invention uses standard cube test specimen, and Light deformation analyzer is used to determine center line transverse direction
Deformation.Carry out cube and split drawing experiment, concrete sample is fixed on testing machine, upper and lower ends add cushion block, cushion block and examination
Filler strip is placed between part.Test data sheet finder charge and transversely deforming amount is drawn to calculate modulus of elasticity of concrete by splitting.In this way,
Prism experiment measure modulus of elasticity of concrete need not be used, and this method is easy to loading control using small tonnage testing machine,
Precision is higher, simple to operate, saves time cost, theoretical clear, precision can be guaranteed.
Brief description of the drawings
Fig. 1 is the structural representation of concrete sample in the present invention；
Fig. 2 is that concrete sample splits drawing test structure schematic diagram in the present invention；
Fig. 3 is that concrete sample splits drawing experiment top view.
Embodiment
Below with reference to accompanying drawing, technical scheme and beneficial effect are described in detail.
The present invention provides a kind of concrete static modulus of elasticity measuring method, and drawing experiment and reference are split using static cube
Concrete static modulus of elasticity measuring process determines test procedure；Experiment obtains cube center line transversely deforming amount and corresponding lotus
Load value, then the calculation formula come out by theory deduction obtain static modulus of elasticity；The measuring method specifically comprises the following steps：
Step 1, standard cube test specimen is made in the concrete of modulus of elasticity to be determined, is tested using the test specimen as drawing is split
Test specimen, design age is arrived by test requirements document maintenance；
Step 2, Light deformation analyzer is arranged to measure perpendicular to loading direction in the symmetric side center position of test specimen two
Horizontal total deformation Δ L；
Step 3, concrete sample is placed on to the center of the lower platen of pressure testing machine, upper lower platen and test specimen it
Between place steel cushion block, between cushion block and concrete sample place three-ply board filler strip, slowly reduce forcing press top board, with test specimen
Ball seat is adjusted when close makes contact uniform；
Step 4, start pressure testing machine, slowly apply pressure, precompressed is carried out, with 0.04MPa/s~0.06MPa/s speed
Degree is continuous and equably loads, and maximum compressive pre-stress is about the 40% of test specimen split tensile strength, repeatedly precompressed three times, until adjacent two
Untill secondary deformation values difference is no more than 0.003mm, it otherwise should continue precompressed, until difference reaches requirement；
Step 5, standard cube test specimen carries out formal test, loading speed is identical with precompressed, loading stress after precompressed
When reaching the 50% of split tensile strength, the deformation values under load P and the load now are recorded；
Step 6, by the average value of the upper deformation values of step two as standard cube center line transverse direction total deformation Δ L, and utilize
Following formula calculates modulus of elasticity of concrete：
In formula, E is modulus of elasticity of concrete, unit MPa；P splits drawing failing load, unit N for 50%；Δ L is two
Light deformation analyzer reading average value, unit mm；D is the standard cube length of side, unit mm；V is Poisson's ratio.
Step 7, the modulus of elasticity of the concrete sample is recorded, measurement is averaged three times for the progress that repeats the above steps, institute
Obtained average value is the modulus of elasticity of this kind of concrete.
Will be given below a specific embodiment, the present invention is described in detail.
As shown in Figure 1 to Figure 3, in the average value in splitting drawing experiment using two Light deformation analyzers 2 measures cube
The total deformation at 2 points of edge at line, specifically table seat 4 is fixed on standard cube test specimen 1, then again surveyed Light deformation
Determine instrument 2 and measuring staff 3 is fixed on table seat 4, and make Light deformation analyzer 2 and measuring staff 3 in the symmetric side of standard cube test specimen 1
Center position is set perpendicular to loading direction, keeps reliable and stable, the measurement accuracy suggestion of the Light deformation analyzer is not less than
0.001mm, need to be returned to zero before on-test and keep measurement range more than needed, in the present embodiment using amesdial assembling as
Example；Between standard cube test specimen 1 is placed on into two cushion blocks 5, and two filler strips 6 are placed in upper and lower ends cushion block 5 and standard
Between cube specimen 1.Experiment uses static loading, ensures that loading position is in loading equipemtn center, avoids discontinuity,
Load P' and Light deformation analyzer average reading Δ u now is recorded after the completion of experiment, springform is tried to achieve by theoretical formula
Amount.
Measurement comprises the concrete steps that：
The first step, the examination that 3 sizes are 150mm × 150mm × 150mm is made in the concrete of modulus of elasticity to be determined
Part, using the test specimen as drawing experiment test specimen is split, design age is arrived by test requirements document maintenance；
Second step, it is micro- perpendicular to loading direction arrangement two in the symmetric side center position of test specimen two to first test specimen
Deformeter is measuring horizontal total deformation Δ L；
3rd step, concrete sample is placed on to the center of the lower platen of 200kN hydraulic servo pressure testing machines, upper
Steel cushion block is placed between lower platen and test specimen, three-ply board filler strip is placed between cushion block and concrete sample, slowly reduces pressure
Machine top board, with test specimen it is close when adjustment ball seat make contact uniform；In the present embodiment, the radius of the cushion block is 75mm, high
Spend and be more than or equal to the test specimen length of side for 20mm, length；The width of the filler strip is 20mm, thickness 3-4mm, and length, which is more than or equal to, to be tried
The part length of side；
4th step, start pressure testing machine, slowly apply pressure, carry out precompressed, it is continuous and uniform with 0.5kN/s speed
Ground load, maximum compressive pre-stress is about the 40% of test specimen split tensile strength, repeatedly precompressed three times, until adjacent deformation values twice differ
Untill no more than 0.003mm, it otherwise should continue precompressed, until difference reaches requirement；
5th step, cube specimen carry out formal test, loading speed is identical with precompressed, and loading stress reaches after precompressed
To split tensile strength 50% when, record the deformation values under load P and the load now；
6th step, by the 5th step, the average value for two deformation values that two Light deformation analyzers collect is as cube
Center line transverse direction total deformation Δ L, and calculate modulus of elasticity of concrete using following formula：
In formula, E is modulus of elasticity of concrete, unit MPa；P splits drawing failing load, unit N for 50%；Δ L is two
Light deformation analyzer reading average value, unit mm；D is the standard cube length of side, unit mm；V is Poisson's ratio.Pass through above formula
Try to achieve modulus of elasticity of concrete.
7th step, the modulus of elasticity of the concrete sample is recorded, above-mentioned step then is repeated to second and third test specimen respectively
Suddenly, 3 elastic mould values are obtained, average, resulting average value is the modulus of elasticity of this kind of concrete.
The modulus of elasticity of concrete measuring method of the present invention need not use prism experiment measure modulus of elasticity of concrete,
And this method is easy to loading control using small tonnage testing machine, precision is higher, simple to operate, saves time cost, theoretical clear
Precision can be guaranteed.Calculate the formula of modulus of elasticity, it is believed that concrete is isotropic material, in elasticity before cracking
Stage.It is vertically strain and longitudinal stress production as caused by lateral stress with arbitrfary point transverse strain on the center line of loading direction
Raw transverse strain sum, in center lineThe transverse strain of scope is integrated, and obtains total deformation Δ L, so as to
Calculate modulus of elasticity.Party's law theory is clear, simple to operate, has preferable precision.
The technological thought of above example only to illustrate the invention, it is impossible to protection scope of the present invention is limited with this, it is every
According to technological thought proposed by the present invention, any change done on the basis of technical scheme, the scope of the present invention is each fallen within
Within.
Claims (6)
1. a kind of concrete static modulus of elasticity measuring method, it is characterised in that comprise the following steps：
Step 1, standard cube test specimen is made in the concrete of modulus of elasticity to be determined, is tried using the test specimen as drawing experiment is split
Part, design age is arrived by test requirements document maintenance；
Step 2, precompressed is carried out to test specimen, until adjacent center line transversely deforming value difference twice meets the requirements；
Step 3, formal test being carried out to test specimen, loading speed is identical with precompressed, when loading stress reaches the 50% of split tensile strength,
Center line transversely deforming value under the load and the load of record now；
Step 4, using the deformation values in step 3 as horizontal total deformation, modulus of elasticity of concrete is calculated.
A kind of 2. concrete static modulus of elasticity measuring method as claimed in claim 1, it is characterised in that：In the step 1,
The size of standard cube test specimen is 150mm × 150mm × 150mm, and the detailed content of the step 2 is:Test specimen is placed on pressure
The center of the lower platen of force tester, steel cushion block is placed between upper lower platen and test specimen, is put between cushion block and test specimen
Put three-ply board filler strip, slowly reduce forcing press top board, with test specimen it is close when adjustment ball seat make contact uniform；Then pressure is started
Testing machine, slowly apply pressure, carry out precompressed, continuously equably loaded with 0.04MPa/s~0.06MPa/s speed, most
Big compressive pre-stress is the 40% of test specimen split tensile strength, and precompressed repeatedly three times, is no more than until adjacent deformation values twice differ
0.003mm, otherwise continue precompressed, until difference reaches requirement.
A kind of 3. concrete static modulus of elasticity measuring method as claimed in claim 2, it is characterised in that：The width of the filler strip
Spend for 20mm, thickness 3-4mm.
A kind of 4. concrete static modulus of elasticity measuring method as claimed in claim 1, it is characterised in that：In the step 3,
By arranging Light deformation analyzer perpendicular to loading direction to measure horizontal total deformation in the symmetric side center position of test specimen two.
A kind of 5. concrete static modulus of elasticity measuring method as claimed in claim 1, it is characterised in that：In the step 4,
Modulus of elasticity of concrete is calculated using following formula：
<mrow>
<mi>E</mi>
<mo>=</mo>
<mfrac>
<mrow>
<mn>4</mn>
<mi>P</mi>
</mrow>
<mrow>
<mi>&pi;</mi>
<mi>D</mi>
</mrow>
</mfrac>
<mo>&CenterDot;</mo>
<mfrac>
<mrow>
<mo>&lsqb;</mo>
<mn>1</mn>
<mo>-</mo>
<mn>0.25</mn>
<mi>&pi;</mi>
<mrow>
<mo>(</mo>
<mn>1</mn>
<mo>-</mo>
<mi>v</mi>
<mo>)</mo>
</mrow>
<mo>&rsqb;</mo>
</mrow>
<mrow>
<mi>&Delta;</mi>
<mi>L</mi>
</mrow>
</mfrac>
</mrow>
In formula, E is modulus of elasticity of concrete, and P splits drawing failing load for 50%, and Δ L is horizontal total deformation, and D is the test specimen length of side,
V is Poisson's ratio.
A kind of 6. concrete static modulus of elasticity measuring method as claimed in claim 1, it is characterised in that：In methods described,
3 test specimens are made in step 1, are respectively repeated steps 2-4, are obtained 3 modulus of elasticity numerical value, average as concrete bullet
The end value of property modulus.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107843484A (en) * | 2017-12-16 | 2018-03-27 | 福州大学 | Concrete tensile strength test device and test method |
| CN107843555A (en) * | 2017-12-20 | 2018-03-27 | 清华大学 | The detection method and device of the true adhesion strength of Arch Dam With Joint |
| CN108776101A (en) * | 2018-06-11 | 2018-11-09 | 河海大学 | A kind of concrete contact dissolution experimental rig for considering to split tensile stress |
| CN109682684A (en) * | 2018-12-24 | 2019-04-26 | 南华机电(太仓)有限公司 | The test method of recessed light fixture |
| CN110006748A (en) * | 2019-03-19 | 2019-07-12 | 江苏亚星锚链股份有限公司 | A kind of measurement method of chain elasticity modulus |
| CN110132714A (en) * | 2018-02-08 | 2019-08-16 | 山东高速济莱城际公路有限公司 | A kind of device and test method for testing irregular rock mass sample deformation parameter |
| CN111965060A (en) * | 2020-08-03 | 2020-11-20 | 河海大学 | Press-in type on-site modulus of resilience measuring device |
| CN112326419A (en) * | 2020-11-06 | 2021-02-05 | 重庆大学 | Concrete elastic modulus measuring method based on capillary stress |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107843484A (en) * | 2017-12-16 | 2018-03-27 | 福州大学 | Concrete tensile strength test device and test method |
| CN107843484B (en) * | 2017-12-16 | 2024-02-06 | 福州大学 | Concrete tensile strength testing device and testing method |
| CN107843555A (en) * | 2017-12-20 | 2018-03-27 | 清华大学 | The detection method and device of the true adhesion strength of Arch Dam With Joint |
| CN107843555B (en) * | 2017-12-20 | 2023-11-07 | 清华大学 | Method and device for detecting true bonding strength of transverse seam of arch dam |
| CN110132714A (en) * | 2018-02-08 | 2019-08-16 | 山东高速济莱城际公路有限公司 | A kind of device and test method for testing irregular rock mass sample deformation parameter |
| CN110132714B (en) * | 2018-02-08 | 2023-11-10 | 山东高速济莱城际公路有限公司 | Device and method for testing deformation parameters of irregular rock mass sample |
| CN108776101A (en) * | 2018-06-11 | 2018-11-09 | 河海大学 | A kind of concrete contact dissolution experimental rig for considering to split tensile stress |
| CN109682684A (en) * | 2018-12-24 | 2019-04-26 | 南华机电(太仓)有限公司 | The test method of recessed light fixture |
| CN110006748B (en) * | 2019-03-19 | 2022-02-18 | 江苏亚星锚链股份有限公司 | Method for measuring elastic modulus of chain |
| CN110006748A (en) * | 2019-03-19 | 2019-07-12 | 江苏亚星锚链股份有限公司 | A kind of measurement method of chain elasticity modulus |
| CN111965060A (en) * | 2020-08-03 | 2020-11-20 | 河海大学 | Press-in type on-site modulus of resilience measuring device |
| CN112326419B (en) * | 2020-11-06 | 2021-09-28 | 重庆大学 | Concrete elastic modulus measuring method based on capillary stress |
| CN112326419A (en) * | 2020-11-06 | 2021-02-05 | 重庆大学 | Concrete elastic modulus measuring method based on capillary stress |
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Application publication date: 20171208 |