CN108732044A - A kind of concrete dynamic anti-bending strength measurement device and method - Google Patents
A kind of concrete dynamic anti-bending strength measurement device and method Download PDFInfo
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- CN108732044A CN108732044A CN201810503168.2A CN201810503168A CN108732044A CN 108732044 A CN108732044 A CN 108732044A CN 201810503168 A CN201810503168 A CN 201810503168A CN 108732044 A CN108732044 A CN 108732044A
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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
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
- G01N3/303—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight generated only by free-falling weight
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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
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
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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
- G01N2203/001—Impulsive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0023—Bending
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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
- G01N2203/003—Generation of the force
- G01N2203/0032—Generation of the force using mechanical means
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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
- G01N2203/003—Generation of the force
- G01N2203/0032—Generation of the force using mechanical means
- G01N2203/0039—Hammer or pendulum
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Abstract
The embodiment of the invention discloses a kind of concrete dynamic anti-bending strength measurement device and methods, wherein the device 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 there are objective table two strip bulges disposed in parallel, two strip bulges to be 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 present invention can carry out concrete sample to be measured impact experiment, and then carry out the dynamic anti-bending strength that concrete sample to be measured is calculated according to the parameter that experiment measures by computer.
Description
Technical field
The present invention relates to testing concrete performance field more particularly to a kind of concrete dynamic anti-bending strength measurement device and
Method.
Background technology
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 specification GB/T 50081 (trisection point load) or U.S. norm
ASTM C293 (central point load) are 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 necessarily will produce on the way in traveling to jolt, jumps vehicle, especially in high ferro or height
The impact load of aircraft landing is born on concrete road surface that the severes such as fast highway use or rail and airfield runway road surface, 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 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 consideration 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 concrete sample the test of anti-bending strength.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 hurrily.
Invention content
An embodiment of the present invention provides the solidifying native dynamic anti-bending strength measurement device of one kind and methods, can measure concrete examination
The dynamic anti-bending strength of part is with the quality of comprehensive assessment pavement concrete material.
According to an aspect of the present invention, a kind of concrete dynamic anti-bending strength measurement device is provided, including：Rack, liter
Descending 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 to be 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 both sides of the impactor respectively with two
The guide rail flexible connection；
The mounting post is internally provided with the driving chain, and the back fixation of the driving chain and the impactor connects
It connects, the driving chain is fixedly connected with the output shaft of the motor；
When the motor drives the transmission chain edge to be moved perpendicular to the direction on 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 invention further includes：Lifting workbench；
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.
According to another aspect of the present invention, a kind of concrete dynamic anti-bending strength assay method is provided, such as above institute is passed through
The concrete dynamic anti-bending strength measurement device realization stated, including：
S1：The pressure curve obtained after concrete sample to be measured is impacted by tup under preset speed is obtained, according to
The size of the pressure curve and the concrete sample to be measured calculates the time-history curves of the concrete sample to be measured；
S2：The time-history curves peak value for determining the time-history curves, according to be measured mixed described in the time-history curves peak computational
The loading stress rate and strain rate of solidifying soil test specimen；
S3：The corresponding static strength of concrete material is obtained, the time-history curves peak value divided by the static strength are obtained
Dynamic to the concrete sample to be measured enhances coefficient；
S4：The concrete sample to be measured that more renews and the size for adjusting preset speed, re-execute S1 to S3, until obtaining
The strain rate and dynamic enhancing coefficient of all concrete samples to be measured；
S5：It is quasi- that curve is carried out according to the strain rate of each concrete sample to be measured and dynamic enhancing coefficient
Conjunction obtains the dynamic anti-bending strength curve of concrete.
Preferably, described that the coagulation to be measured is calculated according to the size of the pressure curve and the concrete sample to be measured
The time-history curves of native test specimen are specially：
It is waited for according to described in the calculating of the size of the pressure curve and the concrete sample to be measured by preset first formula
Survey the time-history curves of concrete sample；
Wherein, preset first formula is：
In formula, P (t) is pressure curve, and L, b and d are respectively the length of concrete sample to be measured, height and width.
Preferably, described according to the loading stress rate of concrete sample to be measured described in the time-history curves peak computational and answering
Variability is specially：
By preset second formula, preset third formula, according to the time-history curves peak value, corresponding calculating is described to be measured respectively
The loading stress rate and strain rate of concrete sample；
Wherein, preset second formula is：
In formula, σ is the peak value of time-history curves σ (t), and τ is time-history curves σ (t) from zero to the time needed for peak value；
The preset third formula is：
In formula, E is the elasticity modulus of concrete sample to be measured.
As can be seen from the above technical solutions, the embodiment of the present invention has the following advantages：
The present invention provides the solidifying native dynamic anti-bending strength measurement device of one kind and methods, wherein the device includes：Rack,
Elevating mechanism, hammer body, impactor, objective table and computer；Elevating mechanism is set to the center of rack, impactor and elevating mechanism
Flexible connection；The bottom of impactor is detachably connected by the axis of pressure sensor and hammer body, and pressure sensor connects with computer
It connects；Objective table is set to the bottom of rack and is oppositely arranged with the tup of hammer body, and objective table has two bar shapeds disposed in parallel
Protrusion, 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 parameter phase
Same cylinder；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 present invention is based on drop hammer impact testing machines, are improved the structure of tup and objective table, can be to concrete sample to be measured
Impact experiment is carried out, and then according to the parameter that experiment measures carries out that concrete sample to be measured is calculated by computer
Dynamic anti-bending strength.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without having to pay creative labor, may be used also for those of ordinary skill in the art
To obtain other attached drawings according to these attached drawings.
Fig. 1 is a kind of structural representation of one embodiment of solidifying native dynamic anti-bending strength measurement device provided by the invention
Figure；
Fig. 2 is the front view of objective table；
Fig. 3 is the vertical view of objective table；
Fig. 4 is the front view of hammer body；
Fig. 5 is the side view of hammer body；
Fig. 6 is a kind of flow signal of one embodiment of solidifying native dynamic anti-bending strength assay method provided by the invention
Figure.
Specific implementation mode
An embodiment of the present invention provides the solidifying native dynamic anti-bending strength measurement device of one kind and methods, can measure concrete examination
The dynamic anti-bending strength of part is with the quality of comprehensive assessment pavement concrete material.
In order to make the invention's purpose, features and advantages of the invention more obvious and easy to understand, below in conjunction with the present invention
Attached drawing in embodiment, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that disclosed below
Embodiment be only a part of the embodiment of the present invention, and not all embodiment.Based on the embodiments of the present invention, this field
All other embodiment that those of ordinary skill is obtained without making creative work, belongs to protection of the present invention
Range.
It please refers to Fig.1 to Fig. 5, a kind of implementation of concrete dynamic anti-bending strength measurement device provided by the invention
Example, including：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 in real time during the impact test of test specimen；
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 experiment 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 of this concrete sample 8 to be measured (i.e. wide) 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 experiment of progress and with reference to U.S. norm ASTM C293 central points 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 is 3 with height the ratio between (or width):1 or 4:1.
The concrete sample to be measured of the present invention is cuboid, is placed on objective table 5, and tup 32 is mounted on impactor 2, presses
According to the demand of different loads, impactor 2 is risen certain altitude by elevating mechanism, using simply supported beam central point loading principle as foundation,
It is fallen freely or with certain initial velocity and impact load is applied 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 both sides of impactor 2 are movable with two guide rails 61 respectively
Connection；
Mounting post 62 is internally provided with driving chain, and 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 edge to be moved perpendicular to the direction on 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 invention further includes：Liftable
Workbench 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 can be to all parts such as motor, sensor, the liftable of entire measurement device
The working condition of the components such as workbench is controlled.
It is to be carried out to the structure and connection relation of concrete dynamic anti-bending strength measurement device provided by the invention above
It is described in detail, above-mentioned apparatus will be based below, experiment process is illustrated：
Before on-test, essence caused by mismachining tolerance can be reduced to the surface smear vaseline of tup and strip bulge
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 installing tup and objective table, the impact load of this time experiment 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 the time needed for peak value σ.It, should if modulus of elasticity of concrete is E
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, test specimen
Strain rate is 0.1-1s-1.Since test material is concrete, can be measured according to experiment of machanics specification ASTM C293 static strong
Degree is σs, dynamic enhancing coefficient (Dynamic Increase Factor, DIF) can be defined further to reflect that concrete is dynamic
State 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 a batch is made, size is the concrete sample of 40 × 40 × 160mm and is conserved 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 bearing is arrived as 25mm in part both ends respectively, 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 test specimen to be measured is placed on objective table two bar shapeds it is convex
On rising, then declines hammer body to test specimen loading surface, adjust the position of tup, ensure 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
Number and corresponding strain rate, then making strain rate enhances the relation curve of coefficient with dynamic, 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.
Referring to Fig. 6, a kind of one embodiment of solidifying native dynamic anti-bending strength assay method provided by the invention, including：
601, the pressure curve obtained after concrete sample to be measured is impacted by tup under preset speed is obtained, according to
The size of pressure curve and concrete sample to be measured calculates the time-history curves of concrete sample to be measured；
602, the time-history curves peak value for determining time-history curves, according to adding for time-history curves peak computational concrete sample to be measured
Carry stress rate and strain rate；
603, the corresponding static strength of concrete material is obtained, time-history curves peak value divided by static strength are obtained to be measured mixed
The dynamic of solidifying soil test specimen enhances coefficient；
604, the concrete sample to be measured that more renews and the size for adjusting preset speed, re-execute 601 to 603, until
Obtain the strain rate and dynamic enhancing coefficient of all concrete samples to be measured；
605, it carries out curve fitting to obtain coagulation according to the strain rate of each concrete sample to be measured and dynamic enhancing coefficient
The dynamic anti-bending strength curve of soil.
Optionally, the time-history curves of concrete sample to be measured are calculated according to the size of pressure curve and concrete sample to be measured
Specially：
Concrete sample to be measured is calculated according to the size of pressure curve and concrete sample to be measured by preset first formula
Time-history curves；
Wherein, preset first formula is：
In formula, P (t) is pressure curve, and L, b and d are respectively the length of concrete sample to be measured, height and width.
Optionally, it is specially according to the loading stress rate of time-history curves peak computational concrete sample to be measured and strain rate：
By preset second formula, preset third formula concrete examination to be measured is calculated according to time-history curves peak value is corresponding respectively
The loading stress rate and strain rate of part；
Wherein, preset second formula is：
In formula, σ is the peak value of time-history curves σ (t), and τ is time-history curves σ (t) from zero to the time needed for peak value；
Preset third formula is：
In formula, E is the elasticity modulus of concrete sample to be measured.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
In several embodiments provided herein, it should be understood that disclosed system, device and method can be with
It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the unit
It divides, only a kind of division of logic function, formula that in actual implementation, there may be another division manner, such as multiple units or component
It can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, it is shown or
The mutual coupling, direct-coupling or communication connection discussed can be the indirect coupling by some interfaces, device or unit
It closes or communicates to connect, can be electrical, machinery or other forms.
The unit illustrated as separating component may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, you can be located at a place, or may be distributed over multiple
In network element.Some or all of unit therein can be selected according to the actual needs to realize the mesh of this embodiment scheme
's.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it can also
It is that each unit physically exists alone, it can also be during two or more units be integrated in one unit.Above-mentioned integrated list
The form that hardware had both may be used in member is realized, can also be realized in the form of SFU software functional unit.
If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product
When, it can be stored in a computer read/write memory medium.Based on this understanding, technical scheme of the present invention is substantially
The all or part of the part that contributes to existing technology or the technical solution can be in the form of software products in other words
It embodies, which is stored in a storage medium, including some instructions are used so that a computer
Equipment (can be personal computer, server or the network equipment etc.) executes the complete of each embodiment the method for the present invention
Portion or part steps.And storage medium above-mentioned includes：USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only
Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc. are various can store journey
The medium of sequence code.
The above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to before
Stating embodiment, invention is explained in detail, it will be understood by those of ordinary skill in the art that：It still can be to preceding
The technical solution recorded in each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
Modification or replacement, the spirit and scope for various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution.
Claims (8)
1. a kind of concrete dynamic anti-bending strength measurement device, which is characterized in that including：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, the both sides of the impactor respectively with described in two
Guide rail is flexibly connected；
The mounting post is internally provided with the driving chain, and 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 motor drives the transmission chain edge to be moved perpendicular to the direction on 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
The hollow space of hollow structure, the impactor is 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 are laser sensor, the laser sensor to be 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
Including：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.
6. a kind of concrete dynamic anti-bending strength assay method, dynamic by the concrete as described in claim 1 to 5 any one
State anti-bending strength measurement device is realized, which is characterized in that including：
S1：The pressure curve obtained after concrete sample to be measured is impacted by tup under preset speed is obtained, according to described
The size of pressure curve and the concrete sample to be measured calculates the time-history curves of the concrete sample to be measured；
S2：The time-history curves peak value for determining the time-history curves, according to concrete to be measured described in the time-history curves peak computational
The loading stress rate and strain rate of test specimen；
S3：The corresponding static strength of concrete material is obtained, the time-history curves peak value divided by the static strength are obtained into institute
State the dynamic enhancing coefficient of concrete sample to be measured；
S4：The concrete sample to be measured that more renews and the size for adjusting preset speed, re-execute S1 to S3, until being owned
The strain rate and dynamic enhancing coefficient of the concrete sample to be measured；
S5：It is carried out curve fitting according to the strain rate of each concrete sample to be measured and dynamic enhancing coefficient
To the dynamic anti-bending strength curve of concrete.
7. concrete dynamic anti-bending strength assay method according to claim 6, which is characterized in that described according to the pressure
The time-history curves that the size of force curve and the concrete sample to be measured calculates the concrete sample to be measured are specially：
It is described to be measured mixed according to the calculating of the size of the pressure curve and the concrete sample to be measured by preset first formula
The time-history curves of solidifying soil test specimen；
Wherein, preset first formula is：
In formula, P (t) is pressure curve, and L, b and d are respectively the length of concrete sample to be measured, height and width.
8. concrete dynamic anti-bending strength assay method according to claim 6, which is characterized in that it is described according to it is described when
Journey peak of curve calculates the loading stress rate of the concrete sample to be measured and strain rate is specially：
By preset second formula, preset third formula the coagulation to be measured is calculated according to the time-history curves peak value is corresponding respectively
The loading stress rate and strain rate of native test specimen；
Wherein, preset second formula is：
In formula, σ is the peak value of time-history curves σ (t), and τ is time-history curves σ (t) from zero to the time needed for peak value；
The preset third formula is：
In formula, E is the elasticity modulus of concrete sample to be measured.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110231457A (en) * | 2019-07-05 | 2019-09-13 | 中冶集团武汉勘察研究院有限公司 | A kind of test macro and method of structured clays elasticity modulus |
| CN110530741A (en) * | 2019-09-25 | 2019-12-03 | 辽宁工业大学 | It is a kind of can mass simultaneous test full-automatic drop hammer impact testing machine |
| CN114563345A (en) * | 2022-03-31 | 2022-05-31 | 中交第一公路勘察设计研究院有限公司 | Device and method for testing interlayer bonding strength of cement-based 3D printing test piece |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN209102533U (en) * | 2018-05-23 | 2019-07-12 | 广东工业大学 | A kind of concrete dynamic anti-bending strength measurement device |
-
2018
- 2018-05-23 CN CN201810503168.2A patent/CN108732044A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN209102533U (en) * | 2018-05-23 | 2019-07-12 | 广东工业大学 | A kind of concrete dynamic anti-bending strength measurement device |
Non-Patent Citations (3)
| Title |
|---|
| FLÁVIO DE ANDRADE SILVA ET AL.: "《Impact behavior of sisal fiber cement composites under flexural load》", 《ACI MATERIALS JOURNAL》 * |
| XIAOCHAOJIN ET AL.: "《Quasi-static and dynamic experimental studies on the tensile strength and failure pattern of concrete and mortar discs》", 《SCIENTIFIC REPORTS》 * |
| 高光发: "《混凝土材料动态压缩强度的应变率强化规律》", 《高压物理学报》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110231457A (en) * | 2019-07-05 | 2019-09-13 | 中冶集团武汉勘察研究院有限公司 | A kind of test macro and method of structured clays elasticity modulus |
| CN110530741A (en) * | 2019-09-25 | 2019-12-03 | 辽宁工业大学 | It is a kind of can mass simultaneous test full-automatic drop hammer impact testing machine |
| CN114563345A (en) * | 2022-03-31 | 2022-05-31 | 中交第一公路勘察设计研究院有限公司 | Device and method for testing interlayer bonding strength of cement-based 3D printing test piece |
| CN114563345B (en) * | 2022-03-31 | 2024-05-31 | 中交第一公路勘察设计研究院有限公司 | Device and method for testing interlayer bonding strength of cement-based 3D printing test piece |
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