CN209102533U - A kind of concrete dynamic anti-bending strength measurement device - Google Patents
A kind of concrete dynamic anti-bending strength measurement device Download PDFInfo
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- CN209102533U CN209102533U CN201820775742.5U CN201820775742U CN209102533U CN 209102533 U CN209102533 U CN 209102533U CN 201820775742 U CN201820775742 U CN 201820775742U CN 209102533 U CN209102533 U CN 209102533U
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- impactor
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Abstract
The utility model embodiment discloses a kind of concrete dynamic anti-bending strength measurement device, which includes: rack, elevating mechanism, hammer body, impactor, objective table and computer；Elevating mechanism is set to the center of rack, and impactor is flexibly connected with elevating mechanism；The bottom of impactor is detachably connected by the axis of pressure sensor and hammer body, and pressure sensor is connect with computer；Objective table is set to the bottom of rack and is oppositely arranged with the tup of hammer body, and objective table has two strip bulges disposed in parallel, and two strip bulges are used to support concrete sample to be measured；The end face of tup and the end face of strip bulge are the identical cylinder of parameter；Tup and strip bulge are not less than the width of concrete sample to be measured along the length of the center of circle axis direction of cylinder.The utility model can carry out impact experiment to concrete sample to be measured, and then carry out the dynamic anti-bending strength that concrete sample to be measured is calculated according to the parameter that test measures by computer.
Description
Technical field
The utility model relates to testing concrete performance field more particularly to a kind of concrete dynamic anti-bending strength measurement dresses
It sets.
Background technique
Concrete road surface refers to the road surface using concrete as main material, due to the Slope protection of cement and concrete pavement plate
Major part is to be broken off, so concrete road surface mix-design will can just meet road surface stress by design objective of bending strength
Situation, therefore as one of important Con trolling index, size will directly affect total quality and the service life on road surface.About concrete
The experimental method of material bending strength is general according to China's specification GB/T 50081 (trisection point load) or U.S. norm
ASTM C293 (central point load) is carried out, and loading velocity is generally between 0.02-0.10MPa per second, and it is anti-to finally obtain its static state
Curved intensity.But as domestic economy develops, logistics and the volume of the flow of passengers increase year by year, and concrete road surface is acted in a large amount of vehicles
Crack or tomography are easily generated under long duration load, automobile will necessarily generate on the way in traveling to jolt, jumps vehicle, especially in high-speed rail or height
The impact load of aircraft landing is born in concrete road surface or rail and airfield runway road surface that the severes such as fast highway use, it will
Concrete road surface is set to be repeatedly subjected to the impact load from external high speed high-energy, it is most likely that occur being much larger than specification institute
Defined loading velocity.Therefore, the anti-bending strength under high speed impact state should more be comprehensively considered.
The shock resistance of concrete belongs to dynamic mechanical, but in dynamic mechanical field, at present concrete material
The direction of concern is concentrated mainly on compression strength and tensile strength, from existing research it is found that under different impact loads, mixes
Coagulate soil dynamic compression strength and tensile strength all differ larger with respective static strength, dynamic failure form also with static state not
Together.Therefore the pavement concrete material for needing to consider anti-bending strength, also need its dynamic anti-bending strength of Supplementary Study.
Drop hammer impact testing machine is one of most common equipment of dynamic experiment, however drop hammer impact testing machine is commonly used in doing
Compression test can not carry out the test of anti-bending strength to concrete sample.Therefore it provides one kind can carry out concrete sample
The device and method of dynamic anti-bending strength test are those skilled in the art's technical problem urgently to be resolved.
Utility model content
The utility model discloses the solidifying native dynamic anti-bending strength measurement devices of one kind, can measure the dynamic of concrete sample
Anti-bending strength is with the superiority and inferiority of comprehensive assessment pavement concrete material.
The utility model provides a kind of concrete dynamic anti-bending strength measurement device, comprising: rack, elevating mechanism, hammer
Body, impactor, objective table and computer；
The elevating mechanism is set to the center of the rack, and the impactor is flexibly connected with the elevating mechanism；
The bottom of the impactor is detachably connected by the axis of pressure sensor and the hammer body, the pressure sensor
It is connect with the computer；
The objective table is set to the bottom of the rack and is oppositely arranged with the tup of the hammer body, the objective table tool
There are two strip bulges disposed in parallel, two strip bulges are used to support concrete sample to be measured；
The end face of the tup and the end face of the strip bulge are the identical cylinder of parameter；
The tup and the strip bulge are not less than described to be measured mixed along the length of the center of circle axis direction of the cylinder
The width of solidifying soil test specimen.
Preferably, the elevating mechanism includes: a pair of guide rails, mounting post, driving chain, motor and compression cylinder；
A pair of guide rail and the mounting post are arranged in parallel in the rack, the two sides of the impactor respectively with two
The guide rail is flexibly connected；
The driving chain, the back fixation company of the driving chain and the impactor are equipped with inside the mounting post
It connects, the driving chain is fixedly connected with the output shaft of the motor；
When the transmission chain described in the motor driven is moved along the direction perpendicular to ground, the driving chain band
It moves the impactor and carries out movement in the same direction；
The compression cylinder is connect with the impactor, for providing impact velocity to the impactor.
Preferably, the impactor is hollow structure, and the hollow space of the impactor is placed with preset quantity counterweight.
Preferably, laser sensor is provided in the guide rail, the laser sensor is for measuring the impactor
Speed.
Preferably, a kind of concrete dynamic anti-bending strength measurement device provided by the utility model further include: liftable work
Make platform；
The lifting workbench is set to the bottom of the objective table, and the lifting workbench is for adjusting the load
The height of object platform.
As can be seen from the above technical solutions, the utility model embodiment has the advantage that
The utility model provides a kind of solidifying native dynamic anti-bending strength measurement device, which includes: rack, elevator
Structure, hammer body, impactor, objective table and computer；Elevating mechanism is set to the center of rack, and impactor and elevating mechanism activity connect
It connects；The bottom of impactor is detachably connected by the axis of pressure sensor and hammer body, and pressure sensor is connect with computer；Loading
Platform is set to the bottom of rack and is oppositely arranged with the tup of hammer body, objective table have two strip bulges disposed in parallel, two
Strip bulge is used to support concrete sample to be measured；The end face of tup and the end face of strip bulge are the identical column of parameter
Face；Tup and strip bulge are not less than the width of concrete sample to be measured along the length of the center of circle axis direction of cylinder.This is practical
It is novel be based on drop hammer impact testing machine, the structure of tup and objective table is improved, can to concrete sample to be measured into
Row impact experiment, and then carried out that the dynamic of concrete sample to be measured is calculated according to the parameter that test measures by computer
State anti-bending strength.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, before not making the creative labor property
It puts, can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is that a kind of structure of one embodiment of solidifying native dynamic anti-bending strength measurement device provided by the utility model is shown
It is intended to；
Fig. 2 is the front view of objective table；
Fig. 3 is the top view of objective table；
Fig. 4 is the front view of hammer body；
Fig. 5 is the side view of hammer body.
Specific embodiment
The utility model embodiment discloses a kind of solidifying native dynamic anti-bending strength measurement device, can measure concrete sample
Dynamic anti-bending strength with the superiority and inferiority of comprehensive assessment pavement concrete material.
Please refer to Fig. 1 to Fig. 5, an a kind of reality of concrete dynamic anti-bending strength measurement device provided by the utility model
Apply example, comprising: rack 1, elevating mechanism, hammer body 3, impactor 2, objective table 5 and computer 4；
Elevating mechanism is set to the center of rack 1, and impactor 2 is flexibly connected with elevating mechanism；
The bottom of impactor 2 is detachably connected by pressure sensor 7 and the axis 31 of hammer body 3, pressure sensor 7 and calculating
Machine 4 connects, and pressure sensor 7 can acquire pressure curve during the impact test of test specimen in real time；
Objective table 5 is set to the bottom of rack 1 and is oppositely arranged with the tup of hammer body 3 32, and objective table 5 is parallel with two
The strip bulge 501 of setting, two strip bulges 501 are used to support concrete sample 8 to be measured, according to test demand, two rules
The difference in height of shape protrusion is not more than 0.02mm.It is understood that two strip bulges are symmetrical arranged with tup 32 for midpoint.
The end face of tup 32 and the end face of strip bulge are the identical cylinder of parameter, 501 edge of tup 32 and strip bulge
The length of the center of circle axis direction of cylinder is not less than the width of concrete sample to be measured.Since objective table 5 has the above structure, because
The shorter side (i.e. wide) of this concrete sample 8 to be measured can be fully seated on strip bulge 501, i.e. the width of test specimen is convex with bar shaped
It rises and is arranged in parallel, length and the strip bulge of test specimen are vertically arranged, therefore entire concrete sample to be measured being capable of smooth placement and loading
On platform 5.For convenience of the subsequent test of progress and referring to U.S. norm ASTM C293 central point load Static Flexural experiment rule
Model can usually set the diameter range of cylinder to 20~40mm, and the height of hammer body 3 is not more than 65mm, and can enable test specimen
Height and width it is equal, length and height the ratio between (or width) are 3:1 or 4:1.
The concrete sample to be measured of the utility model is cuboid, is placed on objective table 5, tup 32 is mounted on impactor 2
On, according to the demand of different loads, impactor 2 is risen certain altitude, is with simply supported beam central point loading principle by elevating mechanism
Foundation is fallen freely or with certain initial velocity and applies impact load to the span centre of concrete sample to be measured.
In the present embodiment, elevating mechanism includes: a pair of guide rails 61, mounting post 62, driving chain, motor 63 and compressed gas
Cylinder；
A pair of guide rails 61 and mounting post 62 are arranged in parallel in rack 1, and the two sides of impactor 2 are movable with two guide rails 61 respectively
Connection；
Driving chain is equipped with inside mounting post 62, driving chain is connect with the back fixation of impactor 2, driving chain and electricity
The output shaft of machine 63 is fixedly connected；
When motor 63 drives transmission chain to be moved along the direction perpendicular to ground, driving chain drives impactor 2
Carry out movement in the same direction；
Compression cylinder is connect with impactor 2, for providing impact velocity to impactor 2.If impactor 2 reaches rack 1
Still not up to required impact velocity behind top, can be impactor compensation speed by compression cylinder.
In the present embodiment, impactor is hollow structure, and the hollow space of impactor is placed with preset quantity counterweight.It leads
Laser sensor is provided in rail, laser sensor is used to measure the speed of impactor.
In the present embodiment, a kind of concrete dynamic anti-bending strength measurement device provided by the utility model further include: can
Self-powered platform 9；
Lifting workbench 9 is set to the bottom of objective table 5, and lifting workbench is used to adjust the height of objective table.
It should be noted that computer 4 being capable of all parts such as motor, sensor, liftable to entire measurement device
The working condition of the components such as workbench is controlled.
Be above to the structure of concrete dynamic anti-bending strength measurement device provided by the utility model and connection relationship into
Capable detailed description will be based on above-mentioned apparatus below, be illustrated to test process:
Before on-test, vaseline can be smeared to the surface of tup and strip bulge, reduce essence caused by mismachining tolerance
Degree influences.Need to prepare no less than 10 concrete samples for obtaining the dynamic bending strength under different impact velocitys, in fact
When testing, by installation tup and objective table, the impact load of this time test can be measured from the pressure sensor on tup.Assuming that
After the completion of experiment, the recorded pressure of pressure sensor is P (t), then time-history curves of the concrete in this experiment bending strength
See formula 1:
Formula 1:Wherein L is concrete sample span length, and b and d are the height and width of concrete sample.If σ
For the peak value of σ (t), as ultimate bending strength, then this experiment loading stress rate is shown in formula 2:
Formula 2:Wherein τ is σ (t) from 0 to time needed for peak value σ.If modulus of elasticity of concrete is E, should
The strain rate of test specimen is shown in formula 3 in secondary experiment:
Formula 3:
Under normal circumstances, the elasticity modulus of concrete material is weaker to the sensibility of strain rate, generally can use its static bullet
Property modulus.According to experiment of machanics specification ASTM C293, loading stress rate range under static experiment in 0.02-0.10Mpa/s,
The strain rate for then corresponding to test specimen is about 10-5-10-6s-1.In the present invention, loading stress rate can reach 1-10GPa/s, examination
The strain rate of part is 0.1-1s-1.Since test material is concrete, can be measured according to experiment of machanics specification ASTM C293 quiet
State intensity is σs, dynamic enhancing coefficient (Dynamic Increase Factor, DIF) can be defined further to reflect coagulation
Native dynamic bending strength and static difference with contact, see formula 4:
Formula 4:
Strain rate can further be passed throughWith the relationship overall merit of the dynamic enhancing coefficient DIF pavement concrete material
Dynamic anti-bending strength.
It is illustrated below with a concrete application scene:
The same match ratio of production a batch, the concrete sample having a size of 40 × 40 × 160mm simultaneously conserve 28 days in fog room.
Customize test fixture simultaneously, two strip bulges bearing circular arc band centre distance should be 110mm when objective table size design, that is, try
The distance of support is arrived respectively as 25mm in part both ends, and the length of tup and strip bulge is 50mm.Objective table is mounted on drop weight test
Motor spindle and fixation, hammer body are mounted on impactor by bolt hole, then two bar shapeds that test specimen to be measured is placed on objective table are convex
On rising, then declines hammer body to test specimen loading surface, adjust the position of tup, guarantee that tup is parallel with two strip bulges, last root
According to different impact velocitys, impactor is risen into corresponding height, starting device simultaneously completes this experiment.After experiment, remove
This test specimen simultaneously records related data, the test specimen then more renewed, then continues to test with different impact velocitys, this batch is real
After the completion of testing, dynamic bending strength under different impact velocitys is calculated separately out using formula 1, formula 2, formula 3 and formula 4, enhancing is
Several and corresponding strain rate, then making strain rate and dynamic enhances the relation curve of coefficient, obtains the batch of material in different punchings
The variation for hitting dynamic bending strength under the action of load, the dynamic bending resistance by repeating different mixture ratio are tested, can laterally be commented
The shock resistance of valence different mixture ratio pavement concrete material.
A kind of concrete dynamic anti-bending strength measurement device provided by the utility model is described in detail above,
For those of ordinary skill in the art, based on the idea of the embodiment of the present invention, in specific embodiment and application range
Upper there will be changes, in conclusion the content of the present specification should not be construed as a limitation of the present invention.
Claims (5)
1. a kind of concrete dynamic anti-bending strength measurement device characterized by comprising rack, elevating mechanism, hammer body, impact
Device, objective table and computer；
The elevating mechanism is set to the center of the rack, and the impactor is flexibly connected with the elevating mechanism；
The bottom of the impactor is detachably connected by the axis of pressure sensor and the hammer body, the pressure sensor and institute
State computer connection；
The objective table is set to the bottom of the rack and is oppositely arranged with the tup of the hammer body, and the objective table has two
Item strip bulge disposed in parallel, two strip bulges are used to support concrete sample to be measured；
The end face of the tup and the end face of the strip bulge are the identical cylinder of parameter；
The tup and the strip bulge are not less than the concrete to be measured along the length of the center of circle axis direction of the cylinder
The width of test specimen.
2. concrete dynamic anti-bending strength measurement device according to claim 1, which is characterized in that the elevating mechanism packet
It includes: a pair of guide rails, mounting post, driving chain, motor and compression cylinder；
A pair of guide rail and the mounting post are arranged in parallel in the rack, and the two sides of the impactor are respectively and described in two
Guide rail is flexibly connected；
The driving chain is equipped with inside the mounting post, the driving chain is connect with the back fixation of the impactor, institute
Driving chain is stated to be fixedly connected with the output shaft of the motor；
When the driving chain described in the motor driven is moved along the direction perpendicular to ground, the driving chain drives institute
It states impactor and carries out movement in the same direction；
The compression cylinder is connect with the impactor, for providing impact velocity to the impactor.
3. concrete dynamic anti-bending strength measurement device according to claim 2, which is characterized in that during the impactor is
Hollow structure, the hollow space of the impactor are placed with preset quantity counterweight.
4. concrete dynamic anti-bending strength measurement device according to claim 2, which is characterized in that setting in the guide rail
There is laser sensor, the laser sensor is used to measure the speed of the impactor.
5. concrete dynamic anti-bending strength measurement device according to any one of claims 1 to 4, which is characterized in that also
It include: lifting workbench；
The lifting workbench is set to the bottom of the objective table, and the lifting workbench is for adjusting the objective table
Height.
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| CN108732044A (en) * | 2018-05-23 | 2018-11-02 | 广东工业大学 | A kind of concrete dynamic anti-bending strength measurement device and method |
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| CN108732044A (en) * | 2018-05-23 | 2018-11-02 | 广东工业大学 | A kind of concrete dynamic anti-bending strength measurement device and method |
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