CN107462477A - A kind of test method and lever that load is continuously applied for concrete sample - Google Patents
A kind of test method and lever that load is continuously applied for concrete sample Download PDFInfo
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- CN107462477A CN107462477A CN201710485341.6A CN201710485341A CN107462477A CN 107462477 A CN107462477 A CN 107462477A CN 201710485341 A CN201710485341 A CN 201710485341A CN 107462477 A CN107462477 A CN 107462477A
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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
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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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
- G01N2203/0003—Steady
-
- 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
- G01N2203/0023—Bending
-
- 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
-
- 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
- G01N2203/0202—Control of the test
- G01N2203/0208—Specific programs of loading, e.g. incremental loading or pre-loading
-
- 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
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
-
- 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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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides the test method that a kind of concrete sample is continuously applied load, it is characterised in that including：Step S1, two pieces identical concrete sample is taken, cushion block is placed between two pieces test specimen, foil gauge is added on test specimen；Step S2, curved drawing load is applied simultaneously to two pieces test specimen two ends；Step S3, endurance quality test is carried out to test specimen.In the performance test method of existing concrete material, experiment is all carried out under concrete force-free state.Using this test method draw the test result of endurance performance of concrete can not truly reflect concrete material performance actual use in performance data.Contrast test with condition is carried out by method proposed by the present invention, it is found that stress test specimen is being had notable difference by Chloride Attack and common non-stress test specimen, and it is regular follow, the degree that weathers is arranged as by the order of severity：Tensile region>Common test specimen>Compressive region.The present invention also proposes a kind of lever that load is continuously applied for concrete sample.
Description
Technical field
The present invention relates to technical field of building construction, and lotus is continuously applied for concrete sample in particular to one kind
The test method and lever of load.
Background technology
According to the reinforced concrete structure of Code for design of concrete structures requirement design, the concrete in component is mainly responsible for
Compression caused by bearing load, reinforcing bar are mainly responsible for bearing tension.And in building structure, concrete component is made in load
Tension, compression are likely to be under, is also being undertaken compression, the coagulation of tensile region by the various states such as curved, the reinforcing bar of compressive region
Soil is also undertaking tension.
In the performance test method of existing concrete material, experiment is carried out under concrete force-free state
's.The test result of endurance performance of concrete is drawn using this test method, the concrete durability with actual building structure
Can test result it is not consistent, so the performance test carried out in the case of concrete non-stress can not truly reflect it is mixed
Performance data in solidifying soil material performance actual use.
The content of the invention
In consideration of it, the present invention proposes a kind of test method and lever that load is continuously applied for concrete sample, it is right
Concrete sample is continuously applied a constant load, keeps test specimen, always in stress, to simulate entity during endurancing is carried out
Concrete material stressing conditions in structure.
On one side, the present invention proposes the test method that a kind of concrete sample is continuously applied load, it is characterised in that
Including：
Step S1, two pieces identical concrete sample is taken, cushion block is placed between two pieces test specimen, strain is added on test specimen
Piece, foil gauge are used for the strain for measuring concrete sample；
Step S2, curved drawing load is applied simultaneously to two pieces test specimen；
Step S3, performance test is carried out to test specimen.
Further, above-mentioned concrete sample is continuously applied in the test method of load, it is characterised in that is carrying out step
, it is necessary to test the performance parameter of test specimen before S1, specifically include：Bending tensile strength, maximum strain amount and stress-strain function.
Further, above-mentioned concrete sample is continuously applied in the test method of load, it is characterised in that step S1 is selected
Concrete sample moulding by casting when, reserve the hole of certain size in test specimen two ends, described hole is further applied load for installation
Required stud.
Further, above-mentioned concrete sample is continuously applied in the test method of load, it is characterised in that step S2, is applied
The mode of curved drawing load is added to include screwing stud application pressure and apply pressure to stud by lever.
Further, above-mentioned concrete sample is continuously applied in the test method of load, it is characterised in that step S3, is surveyed
The performance of examination is the decay resistance of test specimen.
Further, above-mentioned concrete sample is continuously applied in the test method of load, it is characterised in that on the stud
There are pad and nut.
Further, above-mentioned concrete sample is continuously applied in the test method of load, it is characterised in that step S2 applies
Curved drawing load is applied according to the dependent variable size of test specimen.
Further, above-mentioned concrete sample is continuously applied in the test method of load, it is characterised in that the stud,
Nut, lever and cushion block selection material make for the stainless steel or special steel of corrosion resistance.
Beneficial effects of the present invention：By using technical scheme proposed by the present invention, coagulation in actual use can be imitated
Soil material the concrete material performance data measured on this condition and uses concrete material performance in stressing conditions in practice
Data are basically identical, and studying its endurance quality more has accurately.
On the other hand, the invention also provides a kind of lever that load is continuously applied for concrete sample, its feature exist
In the lever is fixed on support；For the support by the T-shaped support bar of two pieces and connecting rod are formed, the stud passes through card
Firmly the connecting rod of connecting T-shaped support bar limits the displacement of the support, and the T-shaped support bar is rotatably connected with cushion block；The lever bag
Head rod, the second connecting rod, the 3rd connecting rod and the 4th connecting rod are included, the connection of first, second connecting rod and support
Bar be rotatablely connected, the 3rd connecting rod be rotatablely connected the first, second, the 4th connecting rod, the 4th connecting rod also with Stud connection.
Further it is used for the lever that concrete sample is continuously applied load, it is characterised in that the head rod is also
Scale pan is connected, curved drawing load is applied to test specimen by placing counterweight on the scale pan.
Brief description of the drawings
By reading the detailed description of hereafter preferred embodiment, it is various other the advantages of and benefit it is common for this area
Technical staff will be clear understanding.Accompanying drawing is only used for showing the purpose of preferred embodiment, and is not considered as to the present invention
Limitation.And in whole accompanying drawing, identical part is denoted by the same reference numerals.In the accompanying drawings：
Fig. 1 is the schematic diagram of the embodiment of the present invention one
Fig. 2 is the schematic diagram of the embodiment of the present invention two
Fig. 3 is Fig. 2 right views
Fig. 4 is the schematic diagram of test test specimen performance parameter
Fig. 5 is test specimen right view
Fig. 6 is test specimen top view
Embodiment
The exemplary embodiment of the disclosure is more fully described below with reference to accompanying drawings.Although the disclosure is shown in accompanying drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
Limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
Completely it is communicated to those skilled in the art.It should be noted that in the case where not conflicting, embodiment in the present invention and
Feature in embodiment can be mutually combined.Describe the present invention in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
The test method of the present application, it is assumed that the loading process of component is in elastic deformation stage, according to the bullet of material
Property modulus it is relative be fixed value, the stress applied to it and the strain proportional occurred, to test specimen application fixed load
Mode, the control for adding load by monitoring strain to carry out, forms the concrete sample for continuing the effect of tension flexure stress, is used for
Other follow-up studies or detection experiment.
Embodiment one
Concrete sample 1 is made, has reinforcing bar 11 in test specimen 1.In concrete sample moulding by casting, reserved in test specimen two ends
The hole 12 of certain size, hole 12 are used to install the stud 4 that positioning is further applied load required, and test specimen is as shown in Figure 5,6.
According to testing program, shaping makes concrete sample, sample dimensions 500mm × 100mm × 100mm, standard curing
Tested to 28d ages.The concrete grade of cast is C25, and the 2 φ 6mm common carbon of Q235 is matched somebody with somebody in a side wherein
Steel gren rod reinforcing bar.
Stress bringing device is tested using the concrete sample of 2 identical sizes as one group, and reserves 1 test specimen simultaneously
Maximum stress for testing concrete sample strains.
Choose one and press mechanical performance of concrete test method with batch test specimen, surveyed before method proposed by the present invention is carried out
Determine the bending tensile strength of armored concrete test specimen.Determined simultaneously in test bending tensile strength process and record the maximum strain of test specimen
Amount and stress strain curve.The schematic diagram of test performance parameter as shown in figure 4, by placing foil gauge 2 on test specimen 1,
Apply concentrfated load 3, related data during being tested by instrument record.
Test piece maintenance takes a test specimen, pressed to after 28d ages《GB/T 50081-2002 normal concretes mechanical property is tried
Test method standard》Test armored concrete test specimen bending tensile strength simultaneously tests the maximum strain amount of test specimen, the sticky position of foil gauge
Put in test specimen side middle part.The test result of the test specimen, bending tensile strength 10.2MPa, the μ ε of maximum strain amount 1463.
Precomputed before experiment plan apply stress size, according to modulus of elasticity it is certain in the case of, stress with should
Become proportional, calculate test specimen and apply dependent variable corresponding to stress.
Installation experiment accessory, foil gauge is placed with test specimen, and (foil gauge is the element for measuring strain, and it can be by machinery
The change strained on component is converted to resistance variations), cushion block 5 is placed between two test specimens 1, installation stud 4 connects two test specimens,
There are nut 41, pad 42 and buffer spring 43 on stud.Two test specimen centre positions by the use of φ 20mm stainless steels stubs as cushion block,
φ 12mm stainless steel studs are installed in the hole that test specimen two ends are reserved, jacketed stainless steel gasket and nut are fixed.Cushion block plays thick stick
The effect of bar, it can ensure that two pieces concrete sample, by the power of formed objects, produces concrete sample when applying load
Bending Deformation.
Both sides nut is symmetrically slowly tightened in experiment, controls the size of bending load to meet according to the numerical value of dependent variable
Sets requirement, as shown in Figure 1.This experimental design is 0.5 times to be further applied load as maximum bending tensile strength, corresponding dependent variable
731 μ ε should be reached, be further applied load the scope of error ± 5% by experiment, the μ ε of μ ε of dependent variable scope 695~777.Slowly symmetrically tighten
Both sides nut is further applied load, and stops loading when the numerical value of dependent variable reaches 700 μ ε and continues observation 1 minute, strains numerical quantity
It is final to stablize in 752 μ ε, meet test requirements document.
Every group of 2 stress test specimens, relative test specimen inner side concrete compression stress, outside concrete in tension stress.
When the load of application meets demand, other performance tests, the experiment carried out in the present embodiment are carried out to test specimen
Predominantly test specimen endurance quality under situation loaded.By be further applied load one group of test specimen and a test specimen not being further applied load,
Carbonization test case is placed on simultaneously carries out anti-carbonation experiment.
Embodiment two
Concrete sample 1 is made, has reinforcing bar 11 in test specimen 1.In concrete sample moulding by casting, reserved in test specimen two ends
The hole 12 of certain size, hole 12 are used to install the stud 4 that positioning is further applied load required, and test specimen is as shown in Figure 5,6.
Stress bringing device is tested using the concrete sample of 2 identical sizes as one group, and reserves 1 test specimen simultaneously
Maximum stress for testing concrete sample strains.
Choose one and press mechanical performance of concrete test method with batch test specimen, surveyed before method proposed by the present invention is carried out
Determine the bending tensile strength of armored concrete test specimen.Determined simultaneously in test bending tensile strength process and record the maximum strain of test specimen
Amount and stress strain curve.The schematic diagram of test performance parameter as shown in figure 4, by placing foil gauge 2 on test specimen 1,
Apply concentrfated load 3, related data during being tested by instrument record.
Foil gauge is placed with test specimen, and cushion block 5 is put among two test specimens 1, stud 4 and lever are installed on test specimen
Support 6, there are nut 41 and pad 42 on stud, lever is that multi-grade lever can be head rod 51, the second connecting rod 52,
Three connecting rods 53 and the 4th connecting rod 54, the one 51, second connecting rod 52 and the connecting rod of support 6 are rotatablely connected, specific table
Now it is connected in connecting rod 62.3rd connecting rod 53 rotation connection the 1st, the 2nd 52, the 4th connecting rod 54, first company
Extension bar 51 is connected with scale pan 7, the 4th connecting rod also with Stud connection 4.Lever is fixed on the frame 6, and support is by by two pieces T
Type support bar 61 and connecting rod (62,63 and 64) composition, the T-shaped support bar 61 are rotatably connected with cushion block 5, and the stud passes through
The displacement that connecting rod (63,64) limits the support is blocked, as shown in Figure 2,3.
Flexural tensile stress is produced in test block by way of placing counterweight in lever end scale pan, by the matter for placing counterweight
The size that amount control is further applied load.
Every group of 2 stress test specimens, relative test specimen inner side concrete compression stress, outside concrete in tension stress.
When the load of application meets demand, other performance tests, the experiment carried out in the present embodiment are carried out to test specimen
Predominantly test specimen endurance quality under situation loaded.
The other guide of the present embodiment is identical with embodiment one.
Test the stud selected, cushion block, lever, support etc. to make using high strength steel or steel alloy, reduce and apply lotus
Stress relaxation situation after load.When contact possible mordant experiment, it is preferred to use corrosion resistance is stainless enough
Steel or special steel.The diameter of stud, the load applied according to required for test specimen are chosen, a diameter of φ of conventional stud
6mm~φ 20mm.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention
God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these changes and modification.
Claims (10)
1. a kind of concrete sample is continuously applied the test method of load, it is characterised in that including：
Step S1, two pieces identical concrete sample is taken, cushion block is placed between two pieces test specimen, foil gauge is added on test specimen, should
Become the strain that piece is used to measure concrete sample；
Step S2, curved drawing load is applied simultaneously to two pieces test specimen；
Step S3, performance test is carried out to test specimen.
2. concrete sample according to claim 1 is continuously applied the test method of load, it is characterised in that is being walked
, it is necessary to test the performance parameter of test specimen before rapid S1, specifically include：Bending tensile strength, maximum strain amount and stress-strain function.
3. concrete sample according to claim 1 is continuously applied the test method of load, it is characterised in that step S1 is selected
During concrete sample moulding by casting, the hole of certain size is reserved in test specimen two ends, described hole, which is used to install, applies lotus
Stud needed for carrying.
4. concrete sample according to claim 3 is continuously applied the test method of load, it is characterised in that step S2,
Applying the mode of curved drawing load includes screwing stud application pressure and applies pressure to stud by lever.
5. concrete sample according to claim 1 is continuously applied the test method of load, it is characterised in that step S3,
The performance of test is the decay resistance of test specimen.
6. concrete sample according to claim 4 is continuously applied the test method of load, it is characterised in that the stud
On have pad and nut.
7. concrete sample according to claim 1 is continuously applied the test method of load, it is characterised in that step S2 is applied
Curved drawing load is added to be applied according to the dependent variable size of test specimen.
8. concrete sample according to claim 6 is continuously applied the test method of load, it is characterised in that the spiral shell
Post, nut, lever and cushion block selection material make for the stainless steel or special steel of corrosion resistance.
9. a kind of lever that load is continuously applied for concrete sample, it is characterised in that the lever is fixed on support；Institute
Support is stated by the T-shaped support bar of two pieces and connecting rod are formed, the stud limits by blocking the connecting rod of connecting T-shaped support bar
The displacement of the support, the T-shaped support bar are rotatably connected with cushion block；The lever includes head rod, the second connecting rod, the 3rd
The connecting rod rotation connection of connecting rod and the 4th connecting rod, first, second connecting rod and support, the 3rd connecting rod, which rotates, to be connected
Connect the first, second, the 4th connecting rod, the 4th connecting rod also with Stud connection.
10. according to claim 9 be continuously applied the lever of load for concrete sample, it is characterised in that described the
One connecting rod is also connected with scale pan, applies curved drawing load to test specimen by placing counterweight on the scale pan.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710485341.6A CN107462477A (en) | 2017-06-22 | 2017-06-22 | A kind of test method and lever that load is continuously applied for concrete sample |
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| CN201710485341.6A CN107462477A (en) | 2017-06-22 | 2017-06-22 | A kind of test method and lever that load is continuously applied for concrete sample |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108181175A (en) * | 2018-02-01 | 2018-06-19 | 塔里木大学 | A kind of device and method for testing eccentric tension concrete durability |
| CN108982082A (en) * | 2018-06-12 | 2018-12-11 | 国网辽宁省电力有限公司电力科学研究院 | The experimental rig of dead load ability |
| CN110470542A (en) * | 2019-09-12 | 2019-11-19 | 辽宁科技大学 | Hold lotus reinforced beam durability loading device |
| CN111678804A (en) * | 2020-07-10 | 2020-09-18 | 天津城建大学 | Static bending load device for concrete member erosion resistance test |
| CN112924277A (en) * | 2021-01-26 | 2021-06-08 | 吉林建筑大学 | Method for detecting mechanical property in plane of plate embedded into surface of concrete member |
| CN112924279A (en) * | 2021-01-26 | 2021-06-08 | 吉林建筑大学 | Test piece and method for detecting mechanical property of concrete in-plane template material without detaching |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108181175A (en) * | 2018-02-01 | 2018-06-19 | 塔里木大学 | A kind of device and method for testing eccentric tension concrete durability |
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| CN111678804A (en) * | 2020-07-10 | 2020-09-18 | 天津城建大学 | Static bending load device for concrete member erosion resistance test |
| CN112924277A (en) * | 2021-01-26 | 2021-06-08 | 吉林建筑大学 | Method for detecting mechanical property in plane of plate embedded into surface of concrete member |
| CN112924279A (en) * | 2021-01-26 | 2021-06-08 | 吉林建筑大学 | Test piece and method for detecting mechanical property of concrete in-plane template material without detaching |
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