CN104931352B - A kind of method of testing of concrete Poisson's ratio - Google Patents
A kind of method of testing of concrete Poisson's ratio Download PDFInfo
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- CN104931352B CN104931352B CN201510364276.2A CN201510364276A CN104931352B CN 104931352 B CN104931352 B CN 104931352B CN 201510364276 A CN201510364276 A CN 201510364276A CN 104931352 B CN104931352 B CN 104931352B
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Abstract
The present invention relates to a kind of method of testing of concrete Poisson's ratio, the method of testing is tested using static modulus of elasticity test pressure process, by the concrete sample for selecting given size, and specific test region and testing scheme are selected on concrete sample, transverse strain meter is positioned over concrete sample two to side center position, longitudinal strain meter is placed in the determination position of two end faces above and below two lateral extents of longitudinal direction of concrete sample, the transversely deforming amount and longitudinal deformation amount are recorded by accurately measuring, the Poisson's ratio of concrete can be calculated using transversely deforming amount and longitudinal deformation amount and transformation ratio.The accurate measure and rapid measure that the concrete poisson ratio test method of the present invention can be done, and testing cost is reduced, favorable repeatability.
Description
Technical field
The present invention relates to construction material concrete, is related specifically to a kind of test for concrete Poisson's ratio detection
Method.
Background technology
Poisson's ratio is by French scientist Poisson（Simon Denis Poisson,1781-1840）Find and propose at first,
It is the elastic constant for reflecting material transversely deforming.Transverse strain and the ratio of longitudinal strain are referred to as Poisson's ratio μ, also cry and laterally become
Property coefficient.When the Poisson's ratio of concrete refers to concrete compression, its transverse strain and the proportionate relationship of longitudinal compressive strain.Coagulation
Clear stipulaties without Poisson ratio in soil structure design specification, more than the data for being worth going out to the Poisson's ratio of different brackets concrete
Between 0.20-0.27.Pile tube bottom concrete surface while tension, this Poisson's ratio because of the effect of poisson effect when being such as pressurized
It is assumed that 0.2 or so, such as calculated by 10MPa compression, the tension that its surface is subject to is just in 2MPa or so, this numerical tabular
It is bright to be enough to make concrete cracking.So the basement process and rational stacking floor height in stockyard just seem important, otherwise lose
It is bigger, having engineering and factory, once the problem of stacking causes the cracking of pipe pile of about near myriametre to scrap, and lesson is painful.
Some defects in existing Poisson's ratio measuring technology be present：Conventional poisson ratio test method needs to use transversely deforming
Foil gauge, Poisson's ratio is detected every time and the defects of needing that transversely deforming foil gauge is lost be present；And due to transversely deforming foil gauge
Between quality difference be present, the poor repeatability of the transversely deforming of concrete Poisson's ratio be present；Because the Poisson's ratio of routine tests skill
The transversely deforming foil gauge of art is arranged in two top end depressed positions, and strained of concrete sample transversely deforming is with mixing
Friction effects between two end faces in solidifying soil top and bottom, and then influence the transversely deforming of concrete.
The content of the invention
Patent of the present invention aims to overcome that above-mentioned the deficiencies in the prior art, there is provided one kind is used for concrete and moored
Pine is than testing with new method of testing.The accurate measure and rapid survey that the concrete poisson ratio test method of the present invention can be done
It is fixed, and testing cost is reduced, favorable repeatability.
In order to reach foregoing invention purpose, the technical scheme that patent of the present invention provides is as follows：
A kind of method of testing of concrete Poisson's ratio, it is characterised in that the method for testing is added using static modulus of elasticity test
Cheng Jinhang tests are pressed through, by selecting the concrete sample of given size, and specific test region are selected on concrete sample
And testing scheme, transverse strain meter is positioned over concrete sample two concrete is placed in side center position, longitudinal strain meter
The determination position of two end faces, the transversely deforming amount and longitudinal direction are recorded by accurately measuring above and below two lateral extents of longitudinal direction of test specimen
Deflection, the Poisson's ratio of concrete can be calculated using transversely deforming amount and longitudinal deformation amount and transformation ratio.
In the method for testing of concrete Poisson's ratio of the present invention, following detailed step has been specifically included：
The first step, it is 300mm × 100mm × 100mm test specimens that the concrete of Poisson's ratio to be determined is made into size, mixed with this
Solidifying native test specimen is used as test test block, and the strength grade and numbering of the concrete are indicated on concrete sample, and standard
Conserve design age；
Second step, the concrete sample of Poisson's ratio to be determined is crushed, specifically with forcing press according to 0.5 ~ 1.0MPa/s
Speed crushing, 3 pieces of continuous crushing, obtain the axial compressive strength payload values of three block concrete test specimens respectively, then by this three pieces
The payload values of concrete sample are calculated by method of arithmetical average and are designated as N oxen；
3rd step, the concrete sample of Poisson's ratio to be determined is placed on the base of test equipment, applied in test equipment
Pressure head one end of downward pressure is pressed on the top of concrete sample, in two relative side centers of concrete sample symmetrically
Place transversely deforming amesdial, the gauge head placement location of the transversely deforming amesdial apart from upper and lower end face be 150mm ± 2mm, away from
It is respectively 50mm ± 1mm from left and right side；Linear deformation amesdial is placed in longitudinal both ends of concrete sample apart from upper and lower two
End face is respectively 50mm ± 1mm positions, horizontal range two sides difference 50mm ± 1mm positions；
4th step, slow Opening pressure machine send fuel tap, are downwardly applied to pressure from the top of concrete sample, try concrete
After part compression produces linear deformation, when pressure is in N/3 oxen, constant pressure and continues one minute, record longitudinal deformation amount is B1, and then
Produce longitudinal strain；And the transverse direction of concrete sample expands in a compressed state, longitudinal deformation amount B2 is recorded, laterally should be produced
Become；
5th step, the transversely deforming amount B1 and longitudinal deformation amount B2 is recorded by accurately measuring, utilizes transversely deforming amount
The Poisson's ratio μ of concrete is calculated using equation below with longitudinal deformation amount and transformation ratio：
Conversion coefficient in formula is 1.5；
6th step, the Poisson's ratio of the concrete test block is recorded, measurement is averaged three times for the progress that repeats the above steps, gained
To average value be this kind of concrete Poisson's ratio.
Based on above-mentioned technical proposal, the method for testing of concrete Poisson's ratio of the invention and the method for testing phase of prior art
Than having following technological merit：
1. the method for testing of concrete Poisson's ratio of the present invention reasonably chooses test position and do not have to foil gauge, all adopt
With deformation amesdial, concrete Poisson's ratio both more can be easily tested, turn avoid conventional poisson ratio test method loss
The defects of foil gauge；And avoid foil gauge sole mass difference and cause concrete transversely deforming larger difference to be present,
And foil gauge is arranged on two top end depressed positions, strained of concrete sample transversely deforming and TOC and
Friction effects between the Liang Ge end faces of bottom, and then influence the transversely deforming of concrete.
2. concrete Poisson's ratio test data is accurate obtained by the method for testing of concrete Poisson's ratio of the present invention, can weigh
Renaturation is good.
Brief description of the drawings
Fig. 1 is the special test equipment of the method for testing of concrete Poisson's ratio of the present invention and mounting means front view.
Fig. 2 is the special test equipment of the method for testing of concrete Poisson's ratio of the present invention and the positive side view of mounting means.
Fig. 3 is the special test equipment of the method for testing of concrete Poisson's ratio of the present invention and mounting means top view.
Embodiment
We do with reference to accompanying drawing and specific embodiment to the method for testing of patent concrete Poisson's ratio of the present invention below
It is further elaborated on, in the hope of providing a clearer understanding of its structure composition and implementation process, but this can not be limited with this
The protection domain of patent of invention.
The present invention is a kind of method of testing of concrete Poisson's ratio, and the method for testing was pressurizeed using static modulus of elasticity test
Cheng Jinhang is tested, and by selecting the concrete sample of given size, and specific test region and survey is selected on concrete sample
Examination scheme, transverse strain meter is positioned over concrete sample two concrete sample is placed in side center position, longitudinal strain meter
Longitudinal direction two lateral extents up and down two end faces determination position, record the transversely deforming amount and linear deformation by accurately measuring
Amount, the Poisson's ratio of concrete can be calculated using transversely deforming amount and longitudinal deformation amount and transformation ratio.
As shown in Figure 1, Figure 2 and Figure 3, it is the special test equipment of method of testing of the present invention and mounting means, specific design
It is as follows：The test equipment includes upper bracket 2 and undersetting 3, and upper bracket 2 and undersetting 3 are supported to keep by two pillars 8
It is parallel to each other.Described upper bracket 2 and undersetting 3 is square plate, is provided with circular hole at the middle part of square plate, and the circular hole is interior
Footpath is more than 1 cornerwise length of concrete sample.
What transverse strain meter was selected in practice is transversely deforming amesdial, and what longitudinal strain meter was selected is that linear deformation thousand divides
Table.Transversely deforming amesdial 5, two transversely deformings have been symmetrically positioned in two relative side centers of concrete sample 1
Amesdial 5 is fixed on undersetting 3 by horizontal fix bar 7 respectively, and transversely deforming amesdial 5 is positioned over into concrete sample two
To side center position so that the gauge head placement location of transversely deforming amesdial 5 apart from upper and lower end face 150mm ± 2mm, while away from
With a distance from the 50mm ± 1mm of left and right side.It is solid that linear deformation amesdial 4 described in two is utilized respectively one section of longitudinally fixed bar 6
It is scheduled on upper bracket 2, one section of longitudinally fixed bar 6 is accordingly fixed on undersetting 3 in addition so that linear deformation amesdial 4
Gauge head is by the square with the upper-end contact of longitudinally fixed bar 6 on undersetting 3, and linear deformation amesdial 4 is placed in concrete sample
Longitudinal both ends apart from upper and lower two end faces be respectively certain position, horizontal range two sides difference certain position, longitudinal both ends
It is respectively 50mm ± 1mm positions, horizontal range two sides difference 50mm ± 1mm positions apart from upper and lower two end faces；The position of test
It is 150mm ± 2mm and 50mm ± 1mm to put range set, and this is allowable error existing for test operation process.
Embodiment 1
The present embodiment is a kind of specific method of testing of concrete Poisson's ratio, and the method for testing has specifically included following detailed
Step：
The first step, select Poisson's ratio to be determined concrete, by concrete be made specification for 300mm × 100mm ×
The how individual test specimens of 100mm, using the concrete sample that these are made as test test block, and this is indicated on concrete sample
Different Poisson's ratios be present to design age, different strength grades in the strength grade and numbering of concrete, and standard curing,
Numbering is to distinguish different test blocks；The Poisson's ratio of the concrete of different larval instar has differences, it is therefore desirable to shows age.
Second step, the concrete sample of Poisson's ratio to be determined is crushed, specifically with forcing press according to 0.5 ~ 1.0MPa/s
Speed crushing, 3 pieces of continuous crushing, obtain the axial compressive strength payload values of three block concrete test specimens respectively, then by this three pieces
The payload values of concrete sample are calculated by method of arithmetical average and are designated as N oxen.
3rd step, the concrete sample of Poisson's ratio to be determined is placed on the base of 2000kN universal test forcing presses, surveyed
The pressure head one end for applying downward pressure in examination equipment is pressed on the top of concrete sample, in two relative sides of concrete sample
Face center is symmetrically positioned transversely deforming amesdial transversely deforming amesdial, the gauge head placement location of the transversely deforming amesdial away from
From upper and lower end face be 150mm ± 2mm, with a distance from left and right side be respectively 50mm ± 1mm；Linear deformation amesdial is placed in concrete examination
Longitudinal both ends of part are respectively 50mm ± 1mm positions, horizontal range two sides difference 50mm ± 1mm positions apart from upper and lower two end faces
Put.
4th step, slowly open 2000kN universal test forcing presses and send fuel tap, be downwardly applied to from the top of concrete sample
Pressure, after concrete sample compression is produced linear deformation, when pressure is in N/3 oxen, constant pressure and continuing one minute, record longitudinal direction
Deflection is B1, and then produces longitudinal strain；And the transverse direction of concrete sample expands in a compressed state, longitudinal deformation amount is recorded
B2, produce transverse strain.
5th step, the transversely deforming amount B1 and longitudinal deformation amount B2 is recorded by accurately measuring, utilizes transversely deforming amount
The Poisson's ratio μ of concrete is calculated using equation below with longitudinal deformation amount and transformation ratio：
Conversion coefficient in formula is 1.5.
6th step, the Poisson's ratio of the concrete test block is recorded, measurement three times is repeated and averages, resulting is averaged
Value is the Poisson's ratio of this kind of concrete.
The concrete poisson ratio test method of the present invention reasonably chooses the test position on concrete sample and does not have to answer
Become piece, all using deformation amesdial, both more can easily test concrete Poisson's ratio, turn avoid conventional Poisson's ratio and survey
The defects of foil gauge is lost in method for testing；And avoid foil gauge sole mass it is different and cause concrete transversely deforming exist compared with
Big difference, and foil gauge are arranged on two top end depressed positions, and strained of concrete sample transversely deforming is with mixing
Friction effects between two end faces in solidifying soil top and bottom, and then influence the transversely deforming of concrete.
Claims (1)
1. a kind of method of testing of concrete Poisson's ratio, it is characterised in that the method for testing is using static modulus of elasticity test pressurization
Process is tested, by select given size concrete sample, and on concrete sample select specific test region and
Testing scheme, transverse strain meter is positioned over concrete sample two to side center position, longitudinal strain meter is placed in concrete examination
The determination position of two end faces above and below two lateral extents of longitudinal direction of part, the transversely deforming amount and longitudinal direction change are recorded by accurately measuring
Shape amount, the Poisson's ratio of concrete can be calculated using transversely deforming amount and longitudinal deformation amount and transformation ratio；
The method of testing includes following detailed step：
The first step, it is 300mm × 100mm × 100mm test specimens that the concrete of Poisson's ratio to be determined is made into size, with the concrete
Test specimen is used as test test block, and the strength grade and numbering of the concrete are indicated on concrete sample, and standard curing
To design age；
Second step, the concrete sample of Poisson's ratio to be determined is crushed, the speed specifically with forcing press according to 0.5 ~ 1.0MPa/s
Degree is broken, 3 pieces of continuous crushing, obtains the axial compressive strength payload values of three block concrete test specimens respectively, then by this three pieces of coagulations
The payload values of native test specimen are calculated by method of arithmetical average and are designated as N oxen；
3rd step, the concrete sample of Poisson's ratio to be determined is placed on the base of test equipment, applied in test equipment downward
Pressure head one end of pressure is pressed on the top of concrete sample, is symmetrically positioned in two relative side centers of concrete sample
Transversely deforming amesdial, the gauge head placement location of the transversely deforming amesdial apart from upper and lower end face be 150mm ± 2mm, distance it is left
Right flank is respectively 50mm ± 1mm；Linear deformation amesdial is placed in longitudinal both ends of concrete sample apart from upper and lower two end faces
Respectively 50mm ± 1mm positions, horizontal range two sides difference 50mm ± 1mm positions；
4th step, slow Opening pressure machine send fuel tap, and pressure is downwardly applied to from the top of concrete sample, make concrete sample by
After pressure produces linear deformation, when pressure is in N/3 oxen, constant pressure and continues one minute, record longitudinal deformation amount is B1, and then is produced
Longitudinal strain；And the transverse direction of concrete sample expands in a compressed state, transversely deforming amount B2 is recorded, produces transverse strain；
5th step, longitudinal deformation amount B1 and transversely deforming amount B2 are recorded by accurately measuring, using transversely deforming amount and indulged
The Poisson's ratio μ of concrete is calculated using equation below to deflection and transformation ratio：
Conversion coefficient in formula is 1.5；
6th step, the Poisson's ratio of the concrete test block is recorded, measurement is averaged three times for the progress that repeats the above steps, resulting
Average value is the Poisson's ratio of this kind of concrete.
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| CN105784495A (en) * | 2016-05-23 | 2016-07-20 | 安徽理工大学 | Device for measuring lateral pressure coefficient and Poisson's ratio of geotechnical material |
| CN106124313B (en) * | 2016-06-12 | 2019-06-21 | 华北水利水电大学 | Concrete and similar material are by the test device for depressing comprehensive deformation performance |
| CN106885734B (en) * | 2017-03-29 | 2023-03-21 | 长安大学 | Concrete material poisson ratio measuring device and method |
| CN107322763B (en) * | 2017-08-25 | 2023-06-20 | 济南四建（集团）有限责任公司 | Permeable concrete compressive strength test piece forming device and forming method |
| CN108955453A (en) * | 2018-06-19 | 2018-12-07 | 天津城建大学 | A kind of instrument installing structure for concrete prism test |
| CN111965060B (en) * | 2020-08-03 | 2023-06-09 | 河海大学 | Press-in type on-site rebound modulus measuring device |
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| CN202735169U (en) * | 2012-08-03 | 2013-02-13 | 中建商品混凝土有限公司 | Device for testing shrinkage of concrete filled steel tubular under effect of vertical load |
| CN103983516B (en) * | 2014-06-10 | 2017-02-15 | 山东大学 | Method for measuring and calculating poisson ratio of soil body |
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Inventor after: Chen Jianda Inventor after: Wu Delong Inventor after: Tian Yingqian Inventor after: Bian Chenghui Inventor before: Chen Jianda Inventor before: Wu Delong Inventor before: Tian Yingqian |
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Address after: 200120 Southwest District, 2123 Pudong Road, Pudong New Area, Shanghai. Patentee after: Shanghai Construction Engineering Building Materials Technology Group Co., Ltd Address before: 200086 Siping Road 848, Shanghai, Hongkou District Patentee before: SHANGHAI JIANGONG CONSTRUCTION MATERIAL Co.,Ltd. |
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