CN208283393U - A kind of measuring system of concrete cracking sensitivity - Google Patents
A kind of measuring system of concrete cracking sensitivity Download PDFInfo
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- CN208283393U CN208283393U CN201820821302.9U CN201820821302U CN208283393U CN 208283393 U CN208283393 U CN 208283393U CN 201820821302 U CN201820821302 U CN 201820821302U CN 208283393 U CN208283393 U CN 208283393U
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- cracking sensitivity
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Abstract
The utility model discloses a kind of measuring system of concrete cracking sensitivity, the measuring system includes the toroidal confinement device for installing concrete sample；For measuring the contactless resistivity measurement device of the resistivity of concrete sample；For obtaining the stress-strain measurement device of the stress-strain data of concrete sample；The toroidal confinement device is installed on contactless resistivity measurement device, and the foil gauge of the stress-strain measurement device is arranged on toroidal confinement device.The utility model passes through the measurement in annulus restrained shrinkage in conjunction with stress-strain measurement device and contactless resistivity measurement instrument, the heat evolution velocity of concrete sample, ess-strain can be developed simultaneously and be detected, and the cracking time and plastic cracking degree of concrete are monitored, thus the more objective cracking sensitivity for comprehensively evaluating concrete material.
Description
Technical field
The utility model relates to cement-based material technical field of performance test, in particular to a kind of concrete cracking sensitivity
Measuring system.
Background technique
Cement-based material, especially concrete material are one of the most widely used materials in modern architecture material, and
The large-scale application of high performance concrete realizes the rapid development of current construction industry.But in the application process of concrete material
In, especially high performance concrete, the problem of always existing easy shrinkage cracking.High performance concrete due to low water-cement ratio and
Ultra-fine cementitious material is easy to produce higher temperature deformation and self-desiccation shrinkage, to cause the early-age crack of concrete.And it tries
Sample cracking is the main reason for directly affecting concrete performance, and can significantly affect the later period performance of concrete structure.Therefore
In the developing material design phase, the cracking sensitivity of cement-based material is evaluated to design high performance for concrete structure performance
Important in inhibiting.
Currently, in practical projects, for the measurement method of the evaluation of concrete cracking sensitivity mainly have it is flat about
The test of beam shrinkage cracking, circularly restrained shrinkage split test and uniaxial restrained shrinkage test.It cracks for flat restrained shrinkage
Test method, although cracking degree can be measured to a certain degree, there is the time of occurrence for being unable to accurate measurements crack and
Cracking degree is that the problem of being influenced by subjective factor is easy as obtained by naked eyes or optical microphotograph sem observation.And about for annular
Although beam shrinkage cracking test method can detecte the development of restraint stress in interior steel loop bonding strain gauge, but crack opened
The degree of exhibition can not be assessed effectively.In uniaxial restrained shrinkage test method, although the cracking performance of energy qualitative evaluation concrete
It is expensive but since it is higher to system sensitivity and sensitive requirements with the stress development of measurement concrete, to limit
Its popularization.In addition, the Hydration of cracking sensitivity and material has much relations, although existing several method can be with one
Determine degree reaction cracking degree or time of occurrence, but lack Hydration be also difficult to the cracking sensitivity of concrete material into
Row objectively evaluates.
Thus the prior art could be improved and improve.
Utility model content
Place in view of above-mentioned deficiencies of the prior art, it is sensitive that the purpose of this utility model is to provide a kind of concrete crackings
Property measuring system, can more it is objective comprehensively evaluate concrete material cracking sensitivity.
In order to achieve the above object, the utility model takes following technical scheme:
A kind of measuring system of concrete cracking sensitivity, comprising:
For installing the toroidal confinement device of concrete sample；
For measuring the contactless resistivity measurement device of the resistivity of concrete sample；
For obtaining the stress-strain measurement device of the stress-strain data of concrete sample；
The toroidal confinement device is installed on contactless resistivity measurement device, and the stress-strain measurement device is answered
Become piece to be arranged on toroidal confinement device.
In the measuring system of the concrete cracking sensitivity, the toroidal confinement device include interior attaching means, it is outer about
Bundle, upper attaching means and lower attaching means, the interior attaching means include a pair of inner ring in semi-annular shape, and the end of a pair of of inner ring is equal
It is provided with the first fixing component；The outer attaching means includes a pair of outer ring in semi-annular shape, and the end of a pair of of outer ring is respectively provided with
There is the second fixing component；The lower attaching means includes a pair of be in semi-annular shape bottom plate, the end of a pair of of bottom plate is provided with the
Three fixing components；The upper attaching means includes a pair of top cover in semi-annular shape；Upper attaching means is co-axially located at lower attaching means
On lower attaching means and sample cell is formed, the top of sample cell is arranged in upper attaching means.
In the measuring system of the concrete cracking sensitivity, the interior attaching means, outer attaching means, upper attaching means and under
Attaching means is dielectric resilience attaching means.
In the measuring system of the concrete cracking sensitivity, first fixing component, the second fixing component and
Three fixing components include pin and corresponding pin folder.
In the measuring system of the concrete cracking sensitivity, it is provided on the lower attaching means for by interior attaching means
The 4th fixed fixing component with outer attaching means.
In the measuring system for the concrete cracking sensitivity stated, the interior attaching means, outer attaching means, upper attaching means and it is lower about
Bundle is rubber attaching means.
In the measuring system for the concrete cracking sensitivity stated, the 4th fixing component includes circumferentially array distribution
Four pairs of fixing bolts, every a pair of fixing bolt are respectively arranged at the inside in the outside and interior attaching means of outer attaching means.
Compared to the prior art, the utility model provides a kind of measuring system of concrete cracking sensitivity, the survey
Amount system includes the toroidal confinement device for installing concrete sample；For measure concrete sample resistivity it is non-contact
Resistivity test device；For obtaining the stress-strain measurement device of the stress-strain data of concrete sample；The annular is about
Bundle device is installed on contactless resistivity measurement device, and the foil gauge of the stress-strain measurement device is arranged in toroidal confinement
On device.The utility model is by combining stress-strain measurement device and contactless resistivity measurement instrument in annulus restrained shrinkage
Measurement, when can develop simultaneously to the heat evolution velocity of concrete sample, ess-strain and detect, and monitor the cracking of concrete
Between and plastic cracking degree, thus more it is objective comprehensively evaluate concrete material cracking sensitivity.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the measuring system of concrete cracking sensitivity provided by the utility model；
Fig. 2 is the structural schematic diagram of interior attaching means provided by the utility model；
Fig. 3 is the structural schematic diagram of outer attaching means provided by the utility model；
Fig. 4 is the structural schematic diagram of lower attaching means provided by the utility model；
Fig. 5 is the structural schematic diagram of upper attaching means provided by the utility model；
Fig. 6 is the top view of sample cell provided by the utility model；
Fig. 7 is the flow chart of the measurement method of concrete cracking sensitivity provided by the utility model；
Fig. 8 is the flow chart of step S10 in the measurement method of concrete cracking sensitivity provided by the utility model；
Fig. 9 is the flow chart of step S30 in the measurement method of concrete cracking sensitivity provided by the utility model.
In figure, 10, toroidal confinement device；11, interior attaching means；12 outer attaching means；13, upper attaching means；14, lower attaching means；
15, inner ring；16, outer ring；17, bottom plate；18, top cover；19, the 4th fixing component；20, contactless resistivity measurement device；21, line
Circle；30, stress-strain measurement device；31, foil gauge；40, the first fixing component；50, the second fixing component；60, third is fixed
Component；70, sample cell.
Specific embodiment
The utility model provides a kind of measuring system of concrete cracking sensitivity, to make the purpose of this utility model, skill
Art scheme and effect are clearer, clear, and the utility model is further described as follows in conjunction with drawings and embodiments.It answers
Work as understanding, specific embodiment described herein only to explain the utility model, is not used to limit the utility model.
Referring to Fig. 1, the structural schematic diagram of the measuring system for concrete cracking sensitivity provided by the utility model, institute
Stating measuring system includes:
For installing the toroidal confinement device 10 of concrete sample；
For measuring the contactless resistivity measurement device 20 of the resistivity of concrete sample；
For obtaining the stress-strain measurement device 30 of the stress-strain data of concrete sample；
The toroidal confinement device 10 is installed on contactless resistivity measurement device 20, the stress-strain measurement device
30 foil gauge 31 is arranged on toroidal confinement device.
Specifically, the toroidal confinement device 10 includes interior attaching means, outer attaching means, upper attaching means and lower attaching means (Fig. 1
In it is unlabeled).Referring to Fig. 2, being the structural schematic diagram of interior attaching means 11 provided by the utility model, the interior attaching means 11
Including a pair of inner ring 15 in semi-annular shape, the end of a pair of of inner ring 15 is provided with the first fixing component 40；Referring to Fig. 3,
For the structural schematic diagram of outer attaching means 12 provided by the utility model, the outer attaching means 12 includes a pair of in the outer of semi-annular shape
Ring 16, the end of a pair of of outer ring 16 are provided with the second fixing component 50；Referring to Fig. 4, for it is provided by the utility model it is lower about
The structural schematic diagram of bundle 14, the lower attaching means 14 include a pair of bottom plate 17 in semi-annular shape, the end of a pair of of bottom plate 17
It is provided with third fixing component 60；Referring to Fig. 5, being the structural schematic diagram of upper attaching means 13 provided by the utility model, institute
Stating attaching means 13 includes a pair of top cover 18 in semi-annular shape.
Wherein, contactless resistivity measurement device 20 is electrodeless resistivity measuring instrument, and toroidal confinement device 10 is installed on
On two coil 21.Specific mounting means is that a pair of of inner ring 15 is each passed through two coils 21, then passes through the first fixed structure
Part 40 combines a pair of of inner ring 15, similarly a pair of of outer ring 16, a pair of of bottom plate 17 and a pair of of top cover 18 can be respectively installed to two
On coil 21, toroidal confinement device is installed on contactless resistivity measurement device 20 by final realize.In the present embodiment,
One fixing component 40, the second fixing component 50 and third fixing component 60 include that pin and corresponding pin folder (are not marked in figure
Number), or the fixation of each attaching means can also be carried out by other means.
More specifically, Fig. 6 is please referred to, is the top view of sample cell 70 provided by the utility model, it is seen that interior constraint
Part 11 and outer attaching means 12 are co-axially located on lower attaching means 14 to form sample cell 70, and sample cell 70 is used for casting concrete
Material forms concrete sample, can place upper attaching means 13 at the top of sample cell 70 with closed concrete sample.Also, it is described
It is provided on lower attaching means 14 for the 4th fixing component 19 that interior attaching means 11 and outer attaching means 12 is fixed, in the present embodiment
In, the 4th fixing component 19 is preferably fixing bolt, and fixing bolt is set as four pairs of circumference array distribution, protrudes from down
The surface of attaching means 14, every a pair of fixing bolt are respectively arranged at the inside in the outside and interior attaching means 11 of outer attaching means 12,
So as to by attaching means 11 and outer attaching means 12 in the stable fixation of interior attaching means 11 and outer attaching means 12, prevent interior constraint respectively
Part 11 and outer attaching means 12 shift on lower attaching means 14.
Therefore, it needs to be mounted on contactless resistivity measurement instrument and be related to based on toroidal confinement device during test
To the measurement of the resistivity of concrete sample, the utility model has the toroidal confinement device of specific combination by providing
10 to provide reliable constraint, and it is easy to dismount each attaching means of combination in test to be suitable for different experimental situations and need
It asks.Meanwhile the interior attaching means 11, outer attaching means 12, upper attaching means 13 and lower attaching means 14 are dielectric resilience attaching means.I.e.
Each attaching means is provided with certain elasticity modulus to provide reliable constraint, and is all made of insulating materials to not influence concrete examination
The detection of the change in resistance of sample, each attaching means is rubber attaching means in the present embodiment.
In addition, stress-strain measurement device 30 by strain gauge (contain foil gauge 31), data acquisition and processing system (in figure
Do not mark) composition.Two of them foil gauge 31 is bonded in interior attaching means 11 respectively on the inner surface of a pair of of inner ring 15.Work as coagulation
When soil sample is shunk, stress-strain measurement device 30 can acquire the stress-strain data of concrete sample generation and progress
Analysis.
In an experiment, by continuous hydration after the completion of concrete sample pours, at this time measured by electrodeless resistivity measuring instrument
The resistivity of concrete sample will be slowly varying.When ring specimen starts cracking, the resistivity meeting of concrete sample
It significantly increases.And with the development that concrete sample is shunk, the crack generated can also continue to extend, the resistance at this moment measured
Rate can be much larger than resistivity when not cracking.The utility model passes through the variation for directly recording the resistivity of concrete sample, from
And it can directly observe the time for calculating the cracking of concrete sample and its cracking degree.
Therefore the measuring system of concrete cracking sensitivity provided by the utility model, by being combined in annulus restrained shrinkage
The measurement of stress-strain measurement device and contactless resistivity measurement instrument can simultaneously answer cement-based material heat evolution velocity, stress
Become development to be detected, and monitor concrete cracking time and plastic cracking degree, so that more objective comprehensively evaluate concrete
The cracking sensitivity of material.
Meanwhile referring to Fig. 7, the utility model also provides a kind of measurement system based on above-mentioned concrete cracking sensitivity
The measurement method of system comprising following steps:
S10, toroidal confinement device is installed on contactless resistivity measurement device；
S20, the foil gauge of stress-strain measurement device is arranged on toroidal confinement device；
S30, it concrete material is poured into sample cell forms concrete sample；
S40, obtain concrete sample cracking sensitivity measurement data and analyze it.
The measurement data includes the resistivity and stress for the concrete sample that contactless resistivity measurement device measures
The stress-strain data for the concrete sample that strain gauge means measure, can be by combining circularly restrained shrinkage split test method
It is special to come while monitoring the Hydration of concrete sample, ess-strain development and crack progressing with non-contact resistivity measurement method
Sign.
Further, referring to Fig. 8, the step S10 is specifically included:
S11, outer attaching means, interior attaching means and lower attaching means are respectively installed on contactless resistivity measurement device；
S12, outer attaching means and interior attaching means are coaxially fixed on lower attaching means and form sample cell.
Further, referring to Fig. 9, the step S30 is specifically included:
S31, concrete material is fitted into sample cell and its is closely knit, forms the concrete sample of predetermined altitude；
S32, upper attaching means is installed on contactless resistivity measurement device, and upper attaching means is set to concrete examination
The top of sample.
Concrete material is fitted into sample cell in the present embodiment and is packed into for two layers of the time-division, every layer plugged and pounded respectively with tamper it is predetermined
Number, and keep inside concrete closely knit by gently vibrating example slot, surfacing.And predetermined altitude preferably in attaching means or
The 2/3 of outer attaching means height, to be convenient for measuring.
Further, it after step S30, further comprises the steps of:
S301, so that the outside of toroidal confinement device is generated convection current, concrete sample is accelerated to generate crack.
Specifically usable blowing device blows to toroidal confinement device at a predetermined rate, so that concrete sample is outer
The contraction rate of wall is faster than the contraction rate of inner wall, shortens the time that sample generates crack, improves the efficiency of test.
Further, it after step S301, further comprises the steps of:
If S302, preset time inner concrete sample do not crack, attaching means and outer attaching means are removed, and in concrete
Seal up paraffin in the surface of sample.
By removing upper attaching means and outer attaching means, the contraction rate of the outer wall of concrete sample can be accelerated, thus more
The further time for shortening concrete sample and generating crack.Preset time may be configured as 24 hours, and paraffin can play insulating effect.
In order to better understand the utility model, below according to FIG. 1 to FIG. 9 and in conjunction with specific embodiments to the utility model
The measurement method of the concrete cracking sensitivity of offer is described in detail:
1, outer ring, inner ring and bottom plate assembling toroidal confinement device: are assembled into two lines of electrodeless resistivity measuring instrument
It on circle, and is followed closely and is fixed with the tip, vaseline is coated in the gap of the junction of outer ring, inner ring and bottom plate, and in the outside of outer ring
And the inside of inner ring is fixed on special bottom plate with 4 screws respectively, sticked on the inner wall of inner ring two foil gauges and with
Data collection system connection in stress-strain measurement device.
2, it pours annulus concrete sample: two layers of concrete material point being fitted into the annulus sample cell of assembling with scuppit,
Every layer is plugged and pounded 75 times with tamper respectively, and gently vibrating example slot keeps the inside of concrete sample closely knit, surfacing；It is formed
The height of concrete sample accounts for about the 2/3 of inner ring and outer rings height, and top cover after the completion of pouring, and opens non-contact resistance
Rate measuring instrument and stress-strain measuring device record the change in resistance and stress-strain development of annulus concrete sample.
3, accelerate concrete annulus outer wall cracking: it is interior for 24 hours after the completion of pouring, the wind of 5m/s wind speed is provided with blowing device
The outer circle ring wall of concrete sample is brushed, so that annulus outer wall contraction rate is faster than inner wall, shortens the time that sample generates crack；
If judging that concrete sample does not crack by the measurement result of electrodeless resistivity measuring instrument after for 24 hours, top cover is removed
And outer ring, and brushed again after paraffin is sealed up in the upper surface of concrete sample.
4, monitor sample cracking time and crack progressing: when sample generates crack, contactless resistivity measurement instrument is shown
Concrete sample resistivity can mutate, as annulus concrete sample cracking time at this time；As concrete hydrating is gone through
The progress of journey, the resistivity and stress-strain sustainable development of concrete sample, this experiment monitor sample by change in resistance and split
Stitch Characteristics of Development.
5, developed by the above measured concrete hydrating course, cracking time, crack progressing feature and ess-strain,
In conjunction with concrete material Evaluation of Cracking Sensitivity index, more objective comprehensive Evaluation of Cracking Sensitivity is carried out to concrete sample.
In conclusion the measuring system of concrete cracking sensitivity provided by the utility model, by providing with specific
Combination toroidal confinement device measuring system, and combine circularly restrained shrinkage crack test protocol and contactless electricity
Resistance rate test method, can monitor simultaneously cement-based material Hydration, hydration stage change in resistance, crack progressing feature and
The many kinds of parameters such as stress-strain development, objectively evaluate the cracking sensitivity of material.And the test of the utility model is surveyed
Amount method is implemented simply, and artifact influence is low, and as a result more accurate, repeatability is high, can be to evaluate opening for cement-based material
It splits sensibility and reliable solution is provided.
It is understood that for those of ordinary skills, can with technical solution according to the present utility model and
The design of its utility model is subject to equivalent substitution or change, and all these changes or replacement all should belong to appended by the utility model
Scope of protection of the claims.
Claims (7)
1. a kind of measuring system of concrete cracking sensitivity characterized by comprising
For installing the toroidal confinement device of concrete sample；
For measuring the contactless resistivity measurement device of the resistivity of concrete sample；
For obtaining the stress-strain measurement device of the stress-strain data of concrete sample；
The toroidal confinement device is installed on contactless resistivity measurement device, the foil gauge of the stress-strain measurement device
It is arranged on toroidal confinement device.
2. the measuring system of concrete cracking sensitivity according to claim 1, which is characterized in that the toroidal confinement dress
It sets including interior attaching means, outer attaching means, upper attaching means and lower attaching means, the interior attaching means includes a pair of in the interior of semi-annular shape
Ring, the end of a pair of of inner ring are provided with the first fixing component；The outer attaching means includes a pair of be in semi-annular shape outer ring, one
Second fixing component is provided with to the end of outer ring；The lower attaching means includes a pair of bottom plate in semi-annular shape, a pair of of bottom
The end of plate is provided with third fixing component；The upper attaching means includes a pair of top cover in semi-annular shape；Upper attaching means with
Lower attaching means is co-axially located on lower attaching means and is formed sample cell, and the top of sample cell is arranged in upper attaching means.
3. the measuring system of concrete cracking sensitivity according to claim 2, which is characterized in that the interior attaching means,
Outer attaching means, upper attaching means and lower attaching means are dielectric resilience attaching means.
4. the measuring system of concrete cracking sensitivity according to claim 2, which is characterized in that the described first fixed structure
Part, the second fixing component and third fixing component include pin and corresponding pin folder.
5. the measuring system of concrete cracking sensitivity according to claim 2, which is characterized in that on the lower attaching means
It is provided with for the 4th fixing component that interior attaching means and outer attaching means is fixed.
6. the measuring system of concrete cracking sensitivity according to claim 3, which is characterized in that the interior attaching means,
Outer attaching means, upper attaching means and lower attaching means are rubber attaching means.
7. the measuring system of concrete cracking sensitivity according to claim 5, which is characterized in that the described 4th fixed structure
Part includes four pairs of fixing bolts of circumferentially array distribution, it is every a pair of fixing bolt be respectively arranged at outer attaching means outside and
The inside of interior attaching means.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820821302.9U CN208283393U (en) | 2018-05-30 | 2018-05-30 | A kind of measuring system of concrete cracking sensitivity |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820821302.9U CN208283393U (en) | 2018-05-30 | 2018-05-30 | A kind of measuring system of concrete cracking sensitivity |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108387717A (en) * | 2018-05-30 | 2018-08-10 | 深圳大学 | A kind of measuring system and its measurement method of concrete cracking sensitivity |
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2018
- 2018-05-30 CN CN201820821302.9U patent/CN208283393U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108387717A (en) * | 2018-05-30 | 2018-08-10 | 深圳大学 | A kind of measuring system and its measurement method of concrete cracking sensitivity |
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