CN104931352A - Method of testing Poisson's ratio of concrete - Google Patents
Method of testing Poisson's ratio of concrete Download PDFInfo
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- CN104931352A CN104931352A CN201510364276.2A CN201510364276A CN104931352A CN 104931352 A CN104931352 A CN 104931352A CN 201510364276 A CN201510364276 A CN 201510364276A CN 104931352 A CN104931352 A CN 104931352A
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Abstract
The invention relates to a method of testing Poisson's ratio of concrete. The method includes: performing testing by pressurizing in static elastic modulus test, selecting a concrete specimen of specified size, selecting a specified test area on the concrete specimen and a test scheme, placing transverse strain gauges at the centers of two opposing sides of the concrete specimen, placing longitudinal strain gauges at positions, determined distances away from the upper and lower end faces, on two longitudinal sides of the concrete specimen, precisely measuring and recording transverse deformation and longitudinal deformation, and calculating the Poisson's ratio of the concrete through the transverse deformation, the longitudinal transformation and a conversion coefficient. The method has the advantages that measuring is precise and fast, testing cost is lowered and repeatability is good.
Description
Technical field
The present invention relates to building materials concrete, be related specifically to a kind of method of testing detected for concrete Poisson ratio.
Background technology
Poisson ratio is found at first by French scientist Poisson (Simon Denis Poisson, 1781-1840) and is proposed, and it is the elastic constant of reflection material transversely deforming.The ratio of transverse strain and longitudinal strain is called Poisson ratio μ, is also horizontal sex change coefficient.When concrete Poisson ratio refers to concrete compression, the proportionate relationship of its transverse strain and longitudinal compressive strain.Without the clear stipulaties of Poisson ratio on Code for design of concrete structures, the data being worth going out to the concrete Poisson ratio of different brackets are many between 0.20-0.27.As the simultaneously tension because of the effect of poisson effect of pile tube bottom concrete surface during pressurized, this Poisson ratio is assumed to about 0.2, compressive stress as pressed 10MPa calculates, and the tension that its surface is subject to is just at about 2MPa, and this numerical value shows to be enough to make concrete cracking.So basement process in stockyard and rational stacking floor height just seem important, otherwise loss is larger, have engineering and factory once the problem of stacking cause the cracking of pipe pile of about closely myriametre to scrap, lesson is painful.
There are some defects in existing Poisson ratio measuring technology: conventional poisson ratio test method needs to use transversely deforming foil gauge, there is the defect needing loss transversely deforming foil gauge in each Poisson ratio that detects; And owing to there is quality difference between transversely deforming foil gauge, there is the poor repeatability of the transversely deforming of concrete Poisson ratio; Transversely deforming foil gauge due to the Poisson ratio measuring technology of routine is arranged on two top end depressed position, strained of concrete sample transversely deforming and the friction effects between TOC and two, bottom end face, and then affect concrete transversely deforming.
Summary of the invention
The object of patent of the present invention is to overcome above-mentioned the deficiencies in the prior art, provides a kind of for the new method of testing of concrete Poisson ratio test.The Accurate Measurement that concrete poisson ratio test method of the present invention can be done and rapid test, and reduce testing cost, favorable repeatability.
In order to reach foregoing invention object, the technical scheme that patent of the present invention provides is as follows:
A kind of method of testing of concrete Poisson ratio, it is characterized in that, this method of testing adopts static modulus of elasticity test pressure process to test, by the concrete sample of selected given size, and on concrete sample, select specific test region and testing scheme, transverse strain meter is positioned over concrete sample two pairs of side center positions, longitudinal strain meter is placed in longitudinally upper and lower two end faces of the two lateral extents allocation really of concrete sample, by accurately this transversely deforming amount and longitudinal deformation amount of survey record, utilize transversely deforming amount and longitudinal deformation amount and transformation ratio can calculate concrete Poisson ratio.
In the method for testing of concrete Poisson ratio of the present invention, specifically include following detailed step:
The first step, the concrete of Poisson ratio to be determined is made and is of a size of 300mm × 100mm × 100mm test specimen, using this concrete sample as test test block, and on concrete sample, indicate this concrete strength grade and numbering, and standard curing is to design age;
Second step, the concrete sample of Poisson ratio to be determined is broken, specifically use pressing machine according to the speed crushing of 0.5 ~ 1.0MPa/s, continuous crushing 3 pieces, obtain the axial compressive strength payload values of three block concrete test specimens respectively, then the payload values of this three block concretes test specimen is designated as N ox by method of arithmetical average calculating;
3rd step, the concrete sample of Poisson ratio to be determined is placed on the base of testing apparatus, pressure head one end testing apparatus applying downward pressure is pressed on the top of concrete sample, transversely deforming clock gauge is placed symmetrically in the side center relative two of concrete sample, and the gauge head placement location distance upper and lower end face of this transversely deforming clock gauge is 150mm ± 2mm, distance left and right side is respectively 50mm ± 1mm; Longitudinal two ends that linear deformation clock gauge is placed in concrete sample are respectively 50mm ± 1mm position, horizontal range two sides 50mm ± 1mm position respectively apart from upper and lower two end faces;
4th step, slow opening pressure machine send fuel tap, applies pressure downwards from the top of concrete sample, make concrete sample pressurized produce linear deformation, when pressure is N/3 ox, constant voltage also continues after one minute, record longitudinal deformation amount is B1, and then produces longitudinal strain; And the transverse direction of concrete sample expands in a compressed state, record longitudinal deformation amount B2, produces transverse strain;
5th step, by accurately survey record this transversely deforming amount B1 and longitudinal deformation amount B2, utilizes transversely deforming amount and longitudinal deformation amount and transformation ratio to utilize following formula to calculate concrete Poisson ratio μ:
Conversion coefficient in formula is 1.5;
6th step, records the Poisson ratio of this concrete test block, and repetition above-mentioned steps is carried out three measurements and averaged, and the mean value obtained is this kind of concrete Poisson ratio.
Based on technique scheme, the method for testing of concrete Poisson ratio of the present invention, compared with the method for testing of prior art, has following technological merit:
1. the method for testing of concrete Poisson ratio of the present invention is reasonably chosen test position and without foil gauge, all adopts distortion clock gauge, both can test concrete Poisson ratio more easily, and turn avoid the defect of conventional poisson ratio test method loss foil gauge; And avoid foil gauge sole mass difference and cause concrete transversely deforming to there is larger difference, and foil gauge is arranged on two top end depressed position, strained of concrete sample transversely deforming and the friction effects between TOC and two, bottom end face, and then affect concrete transversely deforming.
2. the method for testing obtainable concrete Poisson ratio test data of concrete Poisson ratio of the present invention is accurate, favorable repeatability.
Accompanying drawing explanation
Fig. 1 is the special testing apparatus of the method for testing of concrete Poisson ratio of the present invention and mounting means front elevation.
Fig. 2 is the special testing apparatus of the method for testing of concrete Poisson ratio of the present invention and the positive side view of mounting means.
Fig. 3 is the special testing apparatus of the method for testing of concrete Poisson ratio of the present invention and mounting means vertical view.
Embodiment
We are elaborated further with the method for testing of specific embodiment to patent concrete Poisson ratio of the present invention by reference to the accompanying drawings below; understand its structure composition and implementation process in the hope of more cheer and bright, but the protection domain of patent of the present invention can not be limited with this.
The present invention is a kind of method of testing of concrete Poisson ratio, this method of testing adopts static modulus of elasticity test pressure process to test, by the concrete sample of selected given size, and on concrete sample, select specific test region and testing scheme, transverse strain meter is positioned over concrete sample two pairs of side center positions, longitudinal strain meter is placed in longitudinally upper and lower two end faces of the two lateral extents allocation really of concrete sample, by accurately this transversely deforming amount and longitudinal deformation amount of survey record, utilize transversely deforming amount and longitudinal deformation amount and transformation ratio can calculate concrete Poisson ratio.
As shown in Figure 1, Figure 2 and Figure 3, be the special testing apparatus of method of testing of the present invention and mounting means, specific design is as follows: this testing apparatus includes upper bracket 2 and undersetting 3, and upper bracket 2 and undersetting 3 support to keep being parallel to each other by two pillars 8.Described upper bracket 2 and undersetting 3 are square plate, are provided with circular hole at the middle part of square plate, and the internal diameter of this circular hole is greater than the cornerwise length of concrete sample 1.
What in practice, transverse strain meter was selected is transversely deforming clock gauge, and what longitudinal strain meter was selected is linear deformation clock gauge.The side center relative two of concrete sample 1 is placed with transversely deforming clock gauge 5 symmetrically, two transversely deforming clock gauges 5 are fixed on undersetting 3 respectively by horizontal fixed bar 7, transversely deforming clock gauge 5 is positioned over concrete sample two pairs of side center positions, make the gauge head placement location distance upper and lower end face 150mm ± 2mm of transversely deforming clock gauge 5, the distance of distance left and right side 50mm ± 1mm simultaneously.Linear deformation clock gauge 4 described in two utilizes one section of longitudinal fixed bar 6 to be fixed on upper bracket 2 respectively, other one section of longitudinal fixed bar 6 is fixed on undersetting 3 accordingly, make the gauge head of linear deformation clock gauge 4 by the square with longitudinal fixed bar 6 upper-end contact on undersetting 3, and longitudinal two ends that linear deformation clock gauge 4 is placed in concrete sample are respectively certain position apart from upper and lower two end faces, horizontal range two sides are certain position respectively, longitudinal two ends are respectively 50mm ± 1mm position apart from upper and lower two end faces, horizontal range two sides are 50mm ± 1mm position respectively, the position range of test is set as 150mm ± 2mm and 50mm ± 1mm, and this is the permissible error that test operation process exists.
Embodiment 1
The present embodiment is a kind of concrete method of testing of concrete Poisson ratio, and this method of testing specifically includes following detailed step:
The first step, the concrete of selected Poisson ratio to be determined, concrete being made specification is 300mm × 100mm × 100mm many test specimen, using these concrete samples made as test test block, and on concrete sample, indicate this concrete strength grade and numbering, and standard curing is to design age, there is different Poisson ratios in different strength grades, and numbering is to distinguish different test blocks; The concrete Poisson ratio of different larval instar there are differences, and therefore needs to show the length of time.
Second step, the concrete sample of Poisson ratio to be determined is broken, specifically use pressing machine according to the speed crushing of 0.5 ~ 1.0MPa/s, continuous crushing 3 pieces, obtain the axial compressive strength payload values of three block concrete test specimens respectively, then the payload values of this three block concretes test specimen is designated as N ox by method of arithmetical average calculating.
3rd step, the concrete sample of Poisson ratio to be determined is placed on the base of 2000kN universal test pressing machine, pressure head one end testing apparatus applying downward pressure is pressed on the top of concrete sample, place transversely deforming clock gauge transversely deforming clock gauge symmetrically in the center, side that two of concrete sample are relative, the gauge head placement location distance upper and lower end face of this transversely deforming clock gauge is 150mm ± 2mm, distance left and right side is respectively 50mm ± 1mm; Longitudinal two ends that linear deformation clock gauge is placed in concrete sample are respectively 50mm ± 1mm position, horizontal range two sides 50mm ± 1mm position respectively apart from upper and lower two end faces.
4th step, slowly opens 2000kN universal test pressing machine and send fuel tap, apply pressure downwards from the top of concrete sample, make concrete sample pressurized produce linear deformation, when pressure is N/3 ox, constant voltage also continues after one minute, record longitudinal deformation amount is B1, and then produces longitudinal strain; And the transverse direction of concrete sample expands in a compressed state, record longitudinal deformation amount B2, produces transverse strain.
5th step, by accurately survey record this transversely deforming amount B1 and longitudinal deformation amount B2, utilizes transversely deforming amount and longitudinal deformation amount and transformation ratio to utilize following formula to calculate concrete Poisson ratio μ:
Conversion coefficient in formula is 1.5.
6th step, records the Poisson ratio of this concrete test block, and repeatedly carry out three measurements and average, the mean value obtained is this kind of concrete Poisson ratio.
Concrete poisson ratio test method of the present invention reasonably chooses test position on concrete sample and without foil gauge, whole employing distortion clock gauge, both can test concrete Poisson ratio more easily, turn avoid the defect of conventional poisson ratio test method loss foil gauge; And avoid foil gauge sole mass difference and cause concrete transversely deforming to there is larger difference, and foil gauge is arranged on two top end depressed position, strained of concrete sample transversely deforming and the friction effects between TOC and two, bottom end face, and then affect concrete transversely deforming.
Claims (2)
1. the method for testing of a concrete Poisson ratio, it is characterized in that, this method of testing adopts static modulus of elasticity test pressure process to test, by the concrete sample of selected given size, and on concrete sample, select specific test region and testing scheme, transverse strain meter is positioned over concrete sample two pairs of side center positions, longitudinal strain meter is placed in longitudinally upper and lower two end faces of the two lateral extents allocation really of concrete sample, by accurately this transversely deforming amount and longitudinal deformation amount of survey record, utilize transversely deforming amount and longitudinal deformation amount and transformation ratio can calculate concrete Poisson ratio.
2. the method for testing of a kind of concrete Poisson ratio according to claim 1, it is characterized in that, this method of testing includes following detailed step:
The first step, the concrete of Poisson ratio to be determined is made and is of a size of 300mm × 100mm × 100mm test specimen, using this concrete sample as test test block, and on concrete sample, indicate this concrete strength grade and numbering, and standard curing is to design age;
Second step, the concrete sample of Poisson ratio to be determined is broken, specifically use pressing machine according to the speed crushing of 0.5 ~ 1.0MPa/s, continuous crushing 3 pieces, obtain the axial compressive strength payload values of three block concrete test specimens respectively, then the payload values of this three block concretes test specimen is designated as N ox by method of arithmetical average calculating;
3rd step, the concrete sample of Poisson ratio to be determined is placed on the base of testing apparatus, pressure head one end testing apparatus applying downward pressure is pressed on the top of concrete sample, transversely deforming clock gauge is placed symmetrically in the side center relative two of concrete sample, and the gauge head placement location distance upper and lower end face of this transversely deforming clock gauge is 150mm ± 2mm, distance left and right side is respectively 50mm ± 1mm; Longitudinal two ends that linear deformation clock gauge is placed in concrete sample are respectively 50mm ± 1mm position, horizontal range two sides 50mm ± 1mm position respectively apart from upper and lower two end faces;
4th step, slow opening pressure machine send fuel tap, applies pressure downwards from the top of concrete sample, make concrete sample pressurized produce linear deformation, when pressure is N/3 ox, constant voltage also continues after one minute, record longitudinal deformation amount is B1, and then produces longitudinal strain; And the transverse direction of concrete sample expands in a compressed state, record longitudinal deformation amount B2, produces transverse strain;
5th step, by accurately survey record this transversely deforming amount B1 and longitudinal deformation amount B2, utilizes transversely deforming amount and longitudinal deformation amount and transformation ratio to utilize following formula to calculate concrete Poisson ratio μ:
Conversion coefficient in formula is 1.5;
6th step, records the Poisson ratio of this concrete test block, and repetition above-mentioned steps is carried out three measurements and averaged, and the mean value obtained is this kind of concrete Poisson ratio.
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Cited By (6)
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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 |
| CN106124313A (en) * | 2016-06-12 | 2016-11-16 | 华北水利水电大学 | Concrete and similar material are by the test device and method depressing comprehensive deformation performance |
| CN106885734A (en) * | 2017-03-29 | 2017-06-23 | 长安大学 | A kind of concrete material Poisson's ratio determines device and assay method |
| CN107322763A (en) * | 2017-08-25 | 2017-11-07 | 济南四建（集团）有限责任公司 | A kind of pervious concrete compression strength test shaped 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 |
| CN111965060A (en) * | 2020-08-03 | 2020-11-20 | 河海大学 | Press-in type on-site modulus of resilience measuring device |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN106124313A (en) * | 2016-06-12 | 2016-11-16 | 华北水利水电大学 | Concrete and similar material are by the test device and method depressing comprehensive deformation performance |
| 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 |
| CN106885734A (en) * | 2017-03-29 | 2017-06-23 | 长安大学 | A kind of concrete material Poisson's ratio determines device and assay method |
| CN106885734B (en) * | 2017-03-29 | 2023-03-21 | 长安大学 | Concrete material poisson ratio measuring device and method |
| CN107322763A (en) * | 2017-08-25 | 2017-11-07 | 济南四建（集团）有限责任公司 | A kind of pervious concrete compression strength test shaped device and forming 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 |
| CN111965060A (en) * | 2020-08-03 | 2020-11-20 | 河海大学 | Press-in type on-site modulus of resilience measuring device |
| 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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