CN109975346A - Concrete sample temperature crazing-resistance test device and test method - Google Patents
Concrete sample temperature crazing-resistance test device and test method Download PDFInfo
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- CN109975346A CN109975346A CN201910333904.9A CN201910333904A CN109975346A CN 109975346 A CN109975346 A CN 109975346A CN 201910333904 A CN201910333904 A CN 201910333904A CN 109975346 A CN109975346 A CN 109975346A
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- 239000004567 concrete Substances 0.000 title claims abstract description 156
- 238000012360 testing method Methods 0.000 title claims abstract description 54
- 238000010998 test method Methods 0.000 title abstract description 8
- 238000005336 cracking Methods 0.000 claims abstract description 29
- 238000000465 moulding Methods 0.000 claims abstract description 12
- 230000003750 conditioning effect Effects 0.000 claims description 26
- 238000010438 heat treatment Methods 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 238000009826 distribution Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 14
- 238000007791 dehumidification Methods 0.000 claims description 13
- 230000008859 change Effects 0.000 claims description 12
- 238000001914 filtration Methods 0.000 claims description 12
- 238000012545 processing Methods 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 230000001418 larval effect Effects 0.000 claims description 6
- 230000015271 coagulation Effects 0.000 claims description 5
- 238000005345 coagulation Methods 0.000 claims description 5
- 238000012423 maintenance Methods 0.000 claims description 4
- 230000002776 aggregation Effects 0.000 claims description 3
- 238000004220 aggregation Methods 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 claims description 3
- 238000007405 data analysis Methods 0.000 claims description 3
- 230000000717 retained effect Effects 0.000 claims description 3
- 238000004088 simulation Methods 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 238000005057 refrigeration Methods 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 claims 1
- 230000009471 action Effects 0.000 abstract description 3
- 230000001276 controlling effect Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 238000001035 drying Methods 0.000 description 4
- 230000035882 stress Effects 0.000 description 4
- 230000008602 contraction Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000004744 fabric Substances 0.000 description 2
- 238000007499 fusion processing Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000009429 distress Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
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Abstract
The invention discloses a kind of concrete sample temperature crazing-resistance test devices, the intelligent observing and controlling system that cracking resistance including the curing means for the molding temperature expansion charging assembly of concrete sample and for being conserved to concrete sample, and for concrete sample is detected and is used to be monitored curing means；Temperature expansion charging assembly includes temperature expansion annulus internal model and circular external mold and bottom plate, constitutes annular space between temperature expansion annulus internal model and circular external mold.The experimental rig can effectively and rapidly complete temperature action Under Concrete test specimen temperature crazing-resistance test by setting temperature expansion charging assembly, curing means and intelligent observing and controlling system.The invention discloses a kind of concrete sample temperature crazing-resistance test method, which can accurately, reliably carry out the crazing-resistance test of the concrete sample under temperature action.
Description
Technical field
The invention belongs to concrete sample temperature crazing-resistance test technical fields, are specifically related to a kind of concrete sample temperature
Crazing-resistance test device and test method.
Background technique
Concrete cracking problem is to influence the key factor of concrete durability, is had very to the service life of concrete structure
Important influence.For concrete works in the prevalence of problem of Cracking, traditional Test model synthetic techniques can only be strong by resistance to compression, tension
Degree, elasticity modulus limit stretch value, drying shrinkage, are crept, the crack resistance of the single factor experiments evaluation of result concrete such as adiabatic temperature rise
Can, cracking resistance calculation formula multiplicity is difficult to accurately assess the cracking resistance of concrete.Research cracking of reinforced concrete is commented as a result,
Valence method has realistic meaning.
Early stage annulus crazing-resistance test is chiefly used in cement paste, achieves good effect.Occur after being changed to concrete
Two class problems, first is that distress in concrete is compared compared with net slurry crack the problem of concrete cracking sensitivity, centrality is poor, and many places are small
Crack form cracking causes cracking to capture difficult, low to gel material content concrete, or even often will appear indehiscent
Situation.Second is that the capture problem of cracking time, concrete cracking, does not reflect on automatic monitor and sometimes.
Currently, when being tested by temperature and humidity control device concrete charging assembly, due to the unevenness of temperature adjusting
Even and humidity regulation uneven, causing test to be cracked in the process with group concrete sample, consistency is poor, accuracy is low, makes
It is big that concrete temperature and humidity crack resistance detects test result error.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art described above, a kind of concrete sample temperature cracking resistance examination is provided
Experiment device.The experimental rig, can effectively, fastly by setting temperature expansion charging assembly, curing means and intelligent observing and controlling system
The completion concrete sample temperature crazing-resistance test of speed.
To achieve the above object, concrete sample temperature crazing-resistance test device of the present invention the technical solution adopted is that: coagulation
Native test specimen temperature crazing-resistance test device, it is characterised in that: including for the molding temperature expansion charging assembly of concrete sample and
Curing means for being conserved to the concrete sample, and cracking resistance for concrete sample detect
And the intelligent observing and controlling system for being monitored to the curing means；
The temperature expansion charging assembly include for varying with temperature and the temperature expansion annulus internal model that expands and
For being sleeved on the circular external mold of the temperature expansion annulus internal model periphery, and for carrying in the temperature expansion annulus
The bottom plate of mould and the circular external mold is constituted between the temperature expansion annulus internal model and the circular external mold for containing
The annular space of concrete sample.
Above-mentioned concrete sample temperature crazing-resistance test device, it is characterised in that: the temperature of the temperature expansion annulus internal model
It spends the coefficient of expansion and is greater than 20 × 10-6/ DEG C and elastic module be not less than 72GPa.
Above-mentioned concrete sample temperature crazing-resistance test device, which is characterized in that the curing means includes:
Curing box, for holding the concrete temperature expansion charging assembly for forming concrete sample；
Temperature-adjusting device, for being adjusted to the temperature in curing box and then realizing temperature to the concrete sample
It adjusts, the cold wind or hot wind of temperature-adjusting device output are from the left and right side of the curing box even into curing box；
Humidity control apparatus, for being adjusted to the humidity in curing box and then realizing humidity tune to concrete sample
Section, the humidity control apparatus spray water vapour into the curing box by way of from top to bottom.
Above-mentioned concrete sample temperature crazing-resistance test device, it is characterised in that: opened up on the left plate of the curing box
There is left air inlet, right air inlet is offered on the right side plate of the curing box, is provided on the left plate for by the temperature
The cold wind or hot wind of degree regulating device output are delivered to the left blast pipe of the left air inlet, are provided with and are used on the right side plate
Cold wind or hot wind that the temperature-adjusting device exports are delivered to the right blast pipe of the right air inlet, the left plate inside
It is provided with left clapboard, is provided with right clapboard on the inside of the right side plate, between the left plate and left clapboard and the right side plate
Gap is all had between right clapboard, and multiple air pushing holes, the curing box are offered on the left clapboard and the right clapboard
Back side panel on be provided with air outlet, be provided in the curing box for holding concrete temperature expansion charging assembly and coagulation
Native test specimen holds plate.
Above-mentioned concrete sample temperature crazing-resistance test device, it is characterised in that: the temperature-adjusting device includes refrigeration
The cold air outlet of device, heating device and two-position three way magnetic valve, the refrigerating plant passes through the first blast pipe and described two
One entrance of triple valve is connected, and the outlet of the heating device passes through the another of the second blast pipe and the two position three-way valve
A entrance is connected, and the outlet of the two position three-way valve is connected by third blast pipe with the left blast pipe, and described two
The outlet of triple valve is connected by the 4th blast pipe with the right blast pipe；Air outlet on the curing box is connected with air draft
Pipe, the air-exhausting duct are connected by the first backwind tube with the return air inlet of the refrigerating plant, and the air-exhausting duct passes through second time
Air hose is connected with the return air inlet of the heating device, is provided with the first electromagnetism two-port valve on first backwind tube, and described
The second electromagnetism two-port valve is provided on two backwind tubes；It is provided with left blower on the left blast pipe, is arranged on the right blast pipe
There is right blower.
Above-mentioned concrete sample temperature crazing-resistance test device, it is characterised in that: the humidity control apparatus include water tank,
The electric moistening device being connected with the water tank and the horizontal distribution pipe being laid in the curing box, the horizontal distribution pipe pass through
Steam pipe is connected with the delivery outlet of the electric moistening device, be provided on the horizontal distribution pipe it is multiple for by steam by upper and
The steam jet of lower ejection.
Above-mentioned concrete sample temperature crazing-resistance test device, it is characterised in that: the humidity control apparatus further includes
One three-way solenoid valve, the second three-way solenoid valve and the dehumidification device for dehumidifying to the gas in the air-exhausting duct, it is described
First three-way solenoid valve and the second three-way solenoid valve are serially connected on the air-exhausting duct, and first three-way solenoid valve is removed with described
The entrance of wet device is connected, and second three-way solenoid valve is connected with the outlet of the dehumidification device.
Above-mentioned concrete sample temperature crazing-resistance test device, it is characterised in that: the curing means further include for pair
The temperature and humidity adjustment control system that temperature-adjusting device and humidity control apparatus are controlled, the temperature and humidity adjustment control system
Including main controller module, the input of the main controller module is terminated with parameter input circuit module and signal acquisition circuit mould
The input of block, the signal acquisition circuit module is terminated with the temperature for being measured in real time to the temperature in the curing box
Sensor and humidity sensor for being measured in real time to the humidity in the curing box, the main controller module it is defeated
It is terminated with display module out, output end and refrigerating plant, heating device, electric moistening device and the dehumidifying of the main controller module fill
It sets and connects, the left blower, right blower, two-position three way magnetic valve, the first three-way solenoid valve, the second three-way solenoid valve, the first electricity
Magnetic two-port valve and the second electromagnetism two-port valve connect with main controller module.
Above-mentioned concrete sample temperature crazing-resistance test device, it is characterised in that: the intelligent observing and controlling system includes setting
Temperature expansion annulus internal model inner wall and for concrete sample crack when make temperature expansion annulus internal model generate stress
Strain the microstrain sensor detected, the signal for connecting with microstrain sensor and being used to detect microstrain sensor
The signal conditioning circuit module that is improved and connects with the signal conditioning circuit module and be used for the signal condition electricity
The microprocessor module that the signal of road module output is analyzed and processed, and connect with microprocessor module and be used for micro- place
The computer that the data that reason device resume module obtains are analyzed and processed, the signal conditioning circuit module are put by what is successively connected
Big circuit module, filter circuit module, signal time-sharing multiplex circuit module and A/D conversion circuit module are constituted.
For accurate, reliable progress concrete sample temperature crazing-resistance test, the present invention also provides a kind of examinations of concrete
Part temperature crazing-resistance test method.Experimental method of the present invention the technical solution adopted is that: it is a kind of that above-mentioned experimental rig is utilized to carry out
The method of concrete sample temperature crazing-resistance test, which comprises the following steps:
Step 1: concrete sample forms: multiple microstrain sensors are equably pasted onto temperature expansion annulus internal model
Inner wall on, and the temperature expansion annulus internal model is placed on, circular outer die casing is then mounted in the temperature
Then assembled temperature expansion charging assembly is placed on standard vibration machine, and will be stirred by the periphery of expansion annulus internal model
Concrete pour into the annular space between temperature expansion annulus internal model and circular external mold；Finally, starting standard vibration
Platform carries out vibration moulding；
Step 2: experimental rig assembles: firstly, multiple concrete samples after molding are added together with concrete temperature expansion
Component is carried to move entirely into curing box；Then, by multiple microstrain sensors on the temperature expansion annulus internal model inner wall
Output end is all connected to the input terminal of signal conditioning circuit module, the output end of the signal conditioning circuit module is connected to micro-
The input terminal of processor module；Then, the output end of the microprocessor module is connected on computer；
Step 3: the maintenance and crazing-resistance test of concrete sample 3 are carried out by following two temperature variations respectively:
Situation one, at the uniform velocity concrete sample cracking resistance is tested under Elevated Temperature Conditions: keeping temperature in curing box 21 is 20 DEG C
± 2 DEG C, relative humidity be greater than 95% and carry out standard curing by the requirement of different larval instar, the different larval instar for 1d, 3d, 7d or
28d；After demoulding, concrete sample 3 and temperature expansion annulus internal model 11, bottom plate 14 are reapposed in curing box 21, are arranged
So that the humidity in the curing box 21 is always held at 95%, initial temperature is 20 DEG C, so that the temperature in the curing box
1 DEG C is increased within each hour, until the temperature in the curing box reaches 60 DEG C；
Concrete sample cracking resistance test when situation two, simulation mass concrete temperature variation: pass through temperature and humidity
Regulation and control system automatically adjusts to the temperature and humidity in curing box, firstly, being maintained at the humidity in the curing box
95%, and make the temperature in the curing box in 14.8 DEG C of one hours of holding, then, so that the temperature in the curing box
1 DEG C is increased within each hour, until the temperature in the curing box is increased to 22.8 DEG C and is kept for a hour, then, so that institute
It states the temperature in curing box and is successively increased to 23.6 DEG C, 26 DEG C, 29 DEG C, 30.5 DEG C, 35.8 DEG C and each self-sustaining 160 minutes, 440
Minute, 2 hours, 24 hours and 21 hours；
In the above temperature and humidity change procedure, when time of the concrete sample in curing box reach for 24 hours~48h when,
The circular external mold of concrete sample periphery is removed, is retained in the concrete sample and temperature expansion annulus that solidification is integrated
Mould；
Under the different temperature and humidity situation of change of both the above, multiple microstrain sensors in real time to temperature change when make annulus
The ess-strain that shape external mold generates is periodically detected and is exported detected signal to signal conditioning circuit module, letter
The signal that number conditioning circuit module exports microstrain sensor amplifies, filter and A/D conversion process after output to micro-
Processor module, firstly, the microprocessor module calls middle position value filtering module and according to middle position value filtering method, to through signal
Signal detected by conditioning circuit module treated each microstrain sensor carries out middle position value filtering processing, obtains through filtering
The stress-strain data that temperature expansion annulus internal model detected by wave treated each microstrain sensor generates；Then,
The circle of temperature expansion detected by each microstrain sensor after being filtered that the microprocessor module is obtained
The stress-strain data that ring internal model generates is exported to be shown to computer；Finally, the computer calls aggregation of data analysis
The stress-strain data that processing module generates the received temperature expansion annulus internal model carries out comprehensive analysis processing, obtains
The curve that the stress-strain data generated to the temperature expansion annulus internal model changes over time, when in the temperature expansion annulus
When the stress-strain data that mould generates mutates, illustrate that concrete sample is cracked, at this point, recording concrete sample
The time cracked, if concrete sample does not crack, the data record concrete sample that is obtained by computer disposal
The strain value generated during the test.
Compared with the prior art, the present invention has the following advantages:
1, in experimental rig of the present invention, when curing box is heated, temperature expansion annulus internal model is in the work to expand with heat and contract with cold at this time
Expand deformation under, due to linear expansion coefficient difference, deformation quantity much larger than concrete temperature rise effect under generate by
Comprehensive deformation made of deformation and chemical shrinkage, self-constriction, plastic shrinkage, the contraction deformation collective effect of drying shrinkage initiation is expanded,
Cracking phenomena occurs, due to being bonded as an entirety between concrete sample and temperature expansion annulus internal model inner wall after molding,
When the temperature increases, the expansion deformation of temperature expansion annulus internal model can to concrete sample generate tensile stress, further increase and
Accelerate concrete sample cracking, thus facilitate automatic monitor can quickly, timely by the cracking of concrete sample
It reflects.
2, in experimental rig of the present invention, the curing box of curing means is by the left gap of setting and right end clearance, and uniformly opens
Left clapboard and right clapboard equipped with multiple air pushing holes so that into left gap and right end clearance hot wind or cold wind pressure reduction,
And then entering the first cabinet by uniformly distributed multiple air pushing holes again, realization is uniformly heated or is dropped to the first box house
Temperature, while it is excessive and impact concrete examination also can effectively to avoid when single-pipeline circulation part cold wind or hot-blast pressure from crossing high flow rate
Part.
3, it in experimental rig of the present invention, by setting temperature-adjusting device and humidity control apparatus, can effectively control
Temperature and humidity in curing box, it is ensured that required temperature condition and damp condition in concrete sample temperature crazing-resistance test.
4, in test method of the present invention, by preparing concrete sample, to the adjustment and control of curing box temperature and humidity
System, and judge whether concrete sample cracks by the strain of detection temperature expansion annulus internal model, test method is quasi-
Really, reliably.
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
Detailed description of the invention
It, below will be to embodiment or the prior art in order to illustrate more clearly of the present invention or technical solution in the prior art
Attached drawing needed in description is briefly described, it should be apparent that, drawings discussed below is only of the invention one
A little embodiments for those skilled in the art without creative efforts, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the overall structure diagram of experimental rig of the present invention.
Fig. 2 is the structural schematic diagram of the temperature expansion charging assembly of experimental rig of the present invention.
Fig. 3 is enlarged drawing at the A of Fig. 2.
Fig. 4 is the structural schematic diagram of the curing means of experimental rig of the present invention.
Fig. 5 is the structural schematic diagram of left clapboard (right clapboard) in the curing means of experimental rig of the present invention.
Fig. 6 is laying relation schematic diagram of the temperature expansion charging assembly of experimental rig of the present invention in curing box.
Fig. 7 enters the status diagram of curing box for the cold wind or hot wind of the curing means of experimental rig of the present invention.
Fig. 8 is the schematic block circuit diagram of the temperature and humidity adjustment control system of the curing means of experimental rig of the present invention.
Fig. 9 is the schematic block circuit diagram of the intelligent observing and controlling system of experimental rig of the present invention.
Description of symbols:
1-temperature expansion charging assembly；11-temperature expansion annulus internal models；
12-circular external molds；14-bottom plates；
14c-circular hole；15-microstrain sensor check bits；
16-strainers；16a-hook ring；
16b-fixed column；16c-knob；
16d-connecting rod；The first pin shaft of 16e-；
2-curing means；21-curing boxes；
21a-left plate；21b-right side plate；
The left air inlet of 21c-；The right air inlet of 21d-；
The left blast pipe of 21e-；The right blast pipe of 21f-；
21g-left clapboard；21h-right clapboard；
21j-air pushing hole；21k-air outlet；
The left gap 21m-；21n-right end clearance；
21p-fan；21q-front side board；
21r-observation window；21s-loose-leaf；
21t-handle；21u-holds plate；
22-lower boxes；23-temperature and humidity adjustment control systems；
23a-main controller module；23b-parameter input circuit module；
23c-signal acquisition circuit module；23d-temperature sensor；
23e-humidity sensor；23f-display module；
25-temperature-adjusting devices；25a-refrigerating plant；
25b-heating device；25c-two-position three way magnetic valve；
The first blast pipe of 25d-；The second blast pipe of 25e-；
25f-third blast pipe；The 4th blast pipe of 25g-；
25h-air-exhausting duct；The first backwind tube of 25j-；
The second backwind tube of 25k-；25m-the first electromagnetism two-port valve；
25n-the second electromagnetism two-port valve；25s-Zuo Fengji；
The right blower of 25t-；The left air circulation pump of 25u-；
The right air circulation pump of 25v-；25w-air-out blower fan；
26-humidity control apparatus；26a-water tank；
26b-electric moistening device；26c-horizontal distribution pipe；
26d-steam jet；26e-water pipe；
26f-steam pipe；The first three-way solenoid valve of 26p-；
The second three-way solenoid valve of 26q-；26r-dehumidification device；
3-concrete samples；4-intelligent observing and controlling systems；
4a-microstrain sensor；4b-signal conditioning circuit module；
4ba-amplification circuit module；4bb-filter circuit module；
4bc-signal time-sharing multiplex circuit module；4bd-A/D conversion circuit module；
4c-microprocessor module；4d-computer.
Specific embodiment
Many details are explained in the following description in order to fully understand the application.But the application can be with
Much it is different from other way described herein to implement, those skilled in the art can be without prejudice to the application intension the case where
Under do similar popularization, therefore the application is not limited by following public specific implementation.
Concrete sample temperature crazing-resistance test device as shown in Figure 1, comprising: temperature expansion charging assembly 1, curing means
2 and intelligent observing and controlling system 4.
As shown in fig. 2, temperature expansion charging assembly 1 is used for the molding of concrete sample 3.Temperature expansion charging assembly 1 wraps
Include temperature expansion annulus internal model 11, circular external mold 12 and bottom plate 14.
Temperature expansion annulus internal model 11 is for varying with temperature and expanding or shrink, and circular external mold 12 is for being set with
In the periphery of the temperature expansion annulus internal model 11, bottom plate 14 is for carrying the temperature expansion annulus internal model 11 and the annulus
Shape external mold 12.The circular ring shape for containing concrete sample 3 is constituted between temperature expansion annulus internal model 11 and circular external mold 12
Space.
Temperature expansion annulus internal model 11 can vary with temperature and expand or shrink, temperature expansion annulus internal model 11
Temperature expansion coefficient is greater than 20 × 10-6/ DEG C and elastic module be not less than 72GPa.
In the present embodiment, preferred way is that temperature expansion annulus internal model 11 is made of aluminium alloy.In temperature expansion annulus
The outer diameter of mould 11 be 290mm~320mm, temperature expansion annulus internal model 11 with a thickness of 8mm~30mm, temperature expansion annulus internal model
11 height is 100mm~150mm.
As shown in Fig. 2, the inside of temperature expansion annulus internal model 11 is reserved with for installing aftermentioned microstrain sensor 4a's
Microstrain sensor check bit 15.
Bottom plate 14 is circular slab, and the middle part of bottom plate 14 offers circular hole 14c.Toroidal cavity is offered on bottom plate 14, temperature
Degree expansion annulus internal model 11 bottom and the circular groove side cell wall be engaged by clamping, the bottom of circular external mold 12 with
Another side wall clamping of the circular groove matches.
The inside of temperature expansion annulus internal model 11 and the outside of circular external mold 12 are provided with strainer 16, strainer 16
For temperature expansion annulus internal model 11 to be connected with bottom plate 14 and circular external mold 12 with bottom plate 14.
In conjunction with Fig. 2 and Fig. 3, strainer 16 includes hook ring 16a, fixed column 16b, knob 16c and connecting rod 16d, hook ring 16a
It is fixed on bottom plate 14, the inner sidewall of temperature expansion annulus internal model 11 or the outside of circular external mold 12 is arranged in fixed column 16b
On wall, the one end for the 16c that shakes hands is hinged on fixed column 16b, and one end of connecting rod 16d hooks on hook ring 16a, connecting rod 16d's
The other end is hinged on knob 16c.
For the lower end cap of connecting rod 16d on hook ring 16a, the upper end of connecting rod 16d is hinged on knob by the first pin shaft 16e
On 16c, the position in the middle part of knob 16c on the lower is arranged in the first pin shaft 16e, and the lower end for the 16c that shakes hands is hinged by the second pin shaft 16f
On fixed column 16b.
In the present embodiment, the temperature expansion charging assembly 1 when in use, by concreting in temperature expansion annulus
Annular space between mould 11 and circular external mold 12 is to form concrete sample 3, when the temperature expansion charging assembly 1 exists
When being heated in curing box, temperature expansion annulus internal model expands deformation under the action of expanding with heat and contract with cold at this time, since line is swollen
Swollen coefficient is different, deformation quantity much larger than concrete generated under temperature rise effect by expansion deformation and chemical shrinkage, self-constriction,
Comprehensive deformation, occurs cracking phenomena made of the contraction deformation collective effect that plastic shrinkage, drying shrinkage cause, due to coagulation after molding
An entirety, when the temperature increases, temperature expansion annulus are bonded as between 11 inner wall of native test specimen 3 and temperature expansion annulus internal model
The expansion deformation of internal model 11 can generate tensile stress to concrete sample 3, further increase and accelerate the cracking of concrete sample 3,
Quickly, timely the cracking of concrete sample 3 can be reflected to facilitate automatic monitor.
As can be seen above, by the way that strainer 16 is arranged, 11 He of temperature expansion annulus internal model further can be effectively realized
Positioning of the circular external mold 12 on bottom plate 14 can firmly install temperature expansion annulus internal model 11 and circular external mold 12
On bottom plate 14.When specifically used, temperature expansion annulus internal model 11 and circular external mold 12 are first respectively positioned at inner card cage 14a
On exterior bayonet slot 14b, then by the lower end cap of connecting rod 16d on hook ring 16a, then rotation knob 16c to and temperature expansion
The position that annulus internal model 11 and circular external mold 12 fit drives connecting rod 16d at this point, knob 16c is in the course of rotation
And then realize tensioning function.
As shown in figure 4, the curing means 2 includes curing box 21, temperature-adjusting device 25 and humidity control apparatus 26.
As shown in figure 4, the curing box 21 includes holding the concrete temperature expansion load group for forming concrete sample 3
Part 1.The whole curing box 21 is in square, and the curing box 21 is by left plate 21a, back side panel, right side plate 21b, front side board
21q, epipleural and lower side panel are constituted.The chamber door of the curing box 21 is provided on its front side board 21q, and the chamber door is flat
It opens the door, is provided with handle 21t on the chamber door.The front side board 21q is connect with right side plate 21b by loose-leaf 21s, to make institute
Chamber door is stated as vertical hinged door.Fan 21p is provided on the rear wall of the curing box 21.
As shown in figure 4, left air inlet 21c is offered on the left plate 21a of the curing box 21, the right side of the curing box 21
Right air inlet 21d is offered on side plate 21b, left blast pipe 21e is provided on the left plate 21a, left blast pipe 21e is used for will
The cold wind or hot wind that temperature-adjusting device 25 exports are delivered to the left air inlet 21c；Be provided on the right side plate 21b it is right into
Air hose 21f, right blast pipe 21f are for being delivered to right air inlet 21d for cold wind or hot wind that temperature-adjusting device 25 exports.
Be provided with left clapboard 21g on the inside of left plate 21a, be provided with right clapboard 21h on the inside of right side plate 21b, left plate 21a with
Between left clapboard 21g have left gap 21m, between right side plate 21b and right clapboard 21h have right end clearance 21n, left clapboard 21g and
Multiple air pushing hole 21j are offered on right clapboard 21h, are provided with air outlet 21k on the front side board 21q of the curing box 21.
As shown in figure 5, multiple air pushing hole 21j are in uniform cloth on the left clapboard 21g and the right clapboard 21h
If.
As shown in fig. 6, being provided in the curing box 21 for holding concrete temperature expansion charging assembly 1 and concrete
Test specimen 3 holds plate 21u.
As shown in Figure 1, the lower section of curing box 21 is provided with for holding the temperature-adjusting device 25 and the humidity tune
The lower box 22 of regulating device 26.
As shown in Figure 1, being offered on the front side board 21q of curing box 21 for observing its internal observation window 21r.
As shown in figure 4, temperature-adjusting device 25 is used to the temperature in curing box 21 be adjusted and then to the coagulation
Native test specimen 3 realizes that temperature is adjusted, left and right side of the cold wind or hot wind that temperature-adjusting device 25 exports from the curing box 21
Even into curing box 21.
As shown in figure 4, temperature-adjusting device 25 includes refrigerating plant 25a, heating device 25b and two-position three way magnetic valve
25c.Wherein, refrigerating plant 25a is used to cool down for curing box 21, and heating device 25b is used to heat up for curing box 21.The present embodiment
In, the heating device 25b is electric heater, and the refrigerating plant 25a is convertible frequency air-conditioner.
As shown in figure 4, the cold air outlet of refrigerating plant 25a passes through one of the first blast pipe 25d and two position three-way valve 25c
Entrance is connected, and the outlet of heating device 25b is connected by the second blast pipe 25e with another entrance of two position three-way valve 25c
Logical, the outlet of two position three-way valve 25c is connected by third blast pipe 25f with left blast pipe 21e, the two position three-way valve 25c
Outlet be connected by the 4th blast pipe 25g with right blast pipe 21f；Air outlet 21k on curing box 21 is connected with air-exhausting duct
25h, the air-exhausting duct 25h are connected by the first backwind tube 25j with the return air inlet of refrigerating plant 25a, and air-exhausting duct 25h passes through the
Two backwind tube 25k are connected with the return air inlet of heating device 25b, are provided with the first electric two-way valve on the first backwind tube 25j
The second electric two-way valve 25n is provided on 25m, the second backwind tube 25k；Be provided with left blower 25s on left blast pipe 21e, it is right into
Right blower 25t is set on air hose 21f.
As shown in figure 4, left blast pipe 21e and right blast pipe 21f are vertical laying, third blast pipe 25f and the 4th into
Air hose 25g is horizontal layout, and the junction of left blast pipe 21e and third blast pipe 25f are provided with left air circulation pump 25u,
The junction of right blast pipe 21f and the 4th blast pipe 25g are provided with right air circulation pump 25v.
As shown in figure 4, humidity control apparatus 26 is mixed to being molded in turn for the humidity in curing box 21 to be adjusted
Concrete sample 3 on solidifying soil temperature expansion charging assembly 1 realizes humidity regulation, and humidity control apparatus 26 passes through from top to bottom
Mode is layered sprinkling water vapour into curing box 21.
As shown in figure 4, humidity control apparatus 26 includes water tank 26a, electric moistening device 26b and horizontal distribution pipe 26c, electricity humidification
The water inlet of device 26b is connected by water pipe 26e with water tank 26a, and the delivery outlet of electric moistening device 26b passes through steam pipe 26f and water
Divide stringing 26c equally to be connected, horizontal distribution pipe 26c is laid in the inside of curing box 21, is provided on horizontal distribution pipe 26c multiple
Steam jet 26d for from top to bottom spraying steam.
As shown in figure 4, humidity control apparatus 26 further includes the first electric T-shaped valve 26p, the second electric T-shaped valve 26q and use
In the dehumidification device 26r, the first electric T-shaped valve 26p that dehumidify to the gas in air-exhausting duct 25h and the second electric T-shaped valve
26q is serially connected on air-exhausting duct 25h, and the first electric T-shaped valve 26p is connected with the entrance of dehumidification device 26r, and second electronic three
Port valve 26q is connected with the outlet of dehumidification device 26r.In the present embodiment, dehumidification device 26r uses rotary dehumidifier.
As described above, the curing means 2 when in use, is conserved when using 25 Duis of temperature-adjusting device in the present embodiment
When case 21 is heated, the hot wind exported in heating device 25b enters two-position three way magnetic valve 25c through the second blast pipe 25e,
Under the driving of left blower 25s so that hot wind enters left blast pipe 21e through third blast pipe 25f, then through left air inlet 21c into
Enter the left gap 21m between left plate 21a and left clapboard 21g, then enters through air pushing hole 21j uniformly distributed on left clapboard 21g
Into curing box 21, similarly, under the driving of right blower 25t, the hot wind exported from two-position three way magnetic valve 25c is through the 4th air inlet
Pipe 25g enters right blast pipe 21f, then enters in curing box 21 through air pushing hole 21j uniformly distributed on right clapboard 21h.Into
It exports after exchanging heat from air outlet 21k to the hot wind in curing box 21, successively flows back through air-exhausting duct 25h and the second backwind tube 25k
To heating device 25b, a circulation is realized.
Similarly, when being cooled down using temperature-adjusting device 25 to curing box 21, the cold wind of output in refrigerating plant 25a
Enter two-position three way magnetic valve 25c through the first blast pipe 25d, under the driving of left blower 25s, so that cold wind is through third blast pipe
25f enters left blast pipe 21e, then enters the left gap 21m between left plate 21a and left clapboard 21g through left air inlet 21c,
It is entered in curing box 21 through air pushing hole 21j uniformly distributed on left clapboard 21g again, similarly, under the driving of right blower 25t,
The cold wind exported from two-position three way magnetic valve 25c enters right blast pipe 21f through the 4th blast pipe 25g, then through equal on right clapboard 21h
The air pushing hole 21j of even laying is entered in curing box 21.It is defeated from air outlet 21k after exchanging heat to enter the cold wind in curing box 21
Out, it successively is back to refrigerating plant 25a through air-exhausting duct 25h and the first backwind tube 25j, realizes a circulation.
In the present embodiment, in conjunction with Fig. 7, the curing means 2 is used the hot wind of heating device 25b or refrigerating plant 25a
Cold wind be input in curing box 21 through the left and right side of curing box 21, so that the input of cold wind or hot wind is uniform, makes
The concrete sample 3 being molded on concrete temperature expansion charging assembly 1 in curing box 21 is uniformly heated or is cooled down,
Specifically, by the way that left gap 21m and right end clearance 21n is arranged, and be uniformly provided with multiple air pushing hole 21j left clapboard 21g and
Right clapboard 21h so that into left gap 21m and right end clearance 21n hot wind or cold wind pressure reduction, and then again pass through uniform cloth
If multiple air pushing hole 21j enter curing box 21, realize to the uniform heating in 21 inside of curing box or cooling, while can also have
It is excessive and impact concrete sample 3 that effect avoids when single-pipeline circulation part cold wind or hot-blast pressure from crossing high flow rate.
As shown in Figure 4 and Figure 6, the gas in curing box 21 can be made to accelerate circulation by the way that fan 21p is arranged, so that maintenance
Temperature in case 21 is more balanced.
As shown in figure 4, by being arranged, left air circulation pumps 25u and right air circulation pumps 25v and can be respectively cooperating with left blower
25s and right blower 25t enhancing circulation.Similarly, by the way that air-out blower fan 25w is arranged in air outlet 21k, wind velocity is accelerated out.
In the present embodiment, the curing means 2 using humidity control apparatus 26 by by the way of from top to bottom to curing box
Water vapour is sprayed in 21, in this way but also steam can uniformly promote the humidity inside curing box 21, specifically, curing box 21
It is inside provided with and holds plate 21u for holding concrete temperature expansion charging assembly 1 and concrete sample 3.In the present embodiment, institute
Stating and holding plate 21u is hollowed-out board, which is provided with the gap for steam downlink.
As shown in figure 4, humidity control apparatus 26 is when in use, the water that water tank 26a conveying comes is carried out vapour by electric moistening device 26b
Change, the water after vaporization is delivered to horizontal distribution pipe 26c through steam pipe 26f, then sprays from top to bottom through steam jet 26d.When feeding
When humidity in protecting box 21 is excessively high, the air-exhausting duct 25h steam brought out can be dried by dehumidification device 26r, thus
The drying to humidity in curing box 21 is realized, humidity regulation effect is advanced optimized.
Specifically, the quantity of horizontal distribution pipe 26c is three in the present embodiment, three horizontal distribution pipe 26c are in vertical side
Vertical upwards to lay, the quantity for holding plate 21u is also three, and the horizontal distribution pipe 26c is arranged in correspondingly to be contained
The top of plate 21u is put, so that facilitating makes vapor be layered sprinkling from top to bottom.
As shown in Figure 1, since the chamber door of curing box 21 is provided on the front side board 21q of curing box 21, and the chamber door is
Vertical hinged door, facilitate in the horizontal direction by the concrete temperature for forming concrete sample 3 expansion charging assembly 1 be loaded in it is feeding
In protecting box 21, avoid loading and making troubles to staff from the top down.
In the present embodiment, by using convertible frequency air-conditioner as refrigerating plant 25a, so that cryogenic temperature controllable precise.
As shown in connection with fig. 8, curing means 2 further includes for controlling to temperature-adjusting device 25 and humidity control apparatus 26
The temperature and humidity adjustment control system 23 of system, temperature and humidity adjustment control system 23 include main controller module 23a, main controller module
The input of 23a is terminated with parameter input circuit module 23b and signal acquisition circuit module 23c, signal acquisition circuit module 23c's
Input is terminated with the temperature sensor 23d for being measured in real time to the temperature in curing box 21 and is used for in curing box 21
The humidity sensor 23e that is measured in real time of humidity, the output of main controller module 23a is terminated with display module 23f, master control
The output end of device module 23a processed connects with refrigerating plant 25a, heating device 25b, electric moistening device 26b and dehumidification device 26r, left
Blower 25s, right blower 25t, two-position three way magnetic valve 25c, the first three-way solenoid valve 26p, the second three-way solenoid valve 26q, first
Electromagnetism two-port valve 25m and the second electromagnetism two-port valve 25n connect with main controller module 23a.
As shown in figure 9, intelligent observing and controlling system 4 is for detecting the cracking resistance of concrete sample 3 and being used for feeding
Protection unit 2 is monitored.Intelligent observing and controlling system 4 includes the inner wall of temperature expansion annulus internal model 11 being arranged in and for concrete
Microstrain sensor 4a that test specimen 3 generates temperature expansion annulus internal model 11 ess-strain when cracking is detected, it answers with micro-
Become the signal conditioning circuit module 4b that sensor 4a connects and is used to improve the signal that microstrain sensor 4a is detected
With connect with the signal conditioning circuit module 4b and be used for the signal conditioning circuit module 4b export signal divide
The microprocessor module 4c of processing is analysed, and connects with microprocessor module 4c and is used to that microprocessor module 4c to be handled to obtain
The data computer 4d, the signal conditioning circuit module 4b that are analyzed and processed by the amplification circuit module that successively connects
4ba, filter circuit module 4bb, signal time-sharing multiplex circuit module 4bc and A/D conversion circuit module 4bd are constituted.
The present embodiment also proposed a kind of concrete restrained contraction ring crack resistance test method, comprising the following steps:
Step 1: concrete sample 3 forms: multiple microstrain sensor 4a are equably pasted onto temperature expansion annulus
On the inner wall of mould 11, and the temperature expansion annulus internal model 11 is placed on bottom plate 14, is then set with circular external mold 12
In the periphery of the temperature expansion annulus internal model 11, using strainer 16 by temperature expansion annulus internal model 11, circular external mold 12
It is fixed with bottom plate 14, the concrete being stirred is poured into the circular ring shape between temperature expansion annulus internal model 11 and circular external mold 12
In space；Then, assembled temperature expansion charging assembly 1 is placed on standard vibration machine, starts standard vibration machine and shakes
Dynamic molding；
Step 2: experimental rig assembles: firstly, multiple concrete samples 3 after molding are expanded together with concrete temperature
Charging assembly 1 moves entirely into curing box 21；Then, multiple microstrains on 11 inner wall of temperature expansion annulus internal model are passed
The output end of sensor 4a is all connected to the input terminal of signal conditioning circuit module 4b, by the defeated of the signal conditioning circuit module 4b
Outlet is connected to the input terminal of microprocessor module 4c；Then, the output end of the microprocessor module 4c is connected to calculating
On machine 4d；
Step 3: the maintenance and crazing-resistance test of concrete sample 3 are carried out by following two temperature variations respectively:
Situation one, at the uniform velocity concrete sample cracking resistance is tested under Elevated Temperature Conditions: keeping temperature in curing box 21 is 20 DEG C
± 2 DEG C, relative humidity be greater than 95% by different larval instar requirements progress standard curing, the different larval instar be 1d, 3d, 7d or 28d；
After demoulding, concrete sample 3 and temperature expansion annulus internal model 11, bottom plate 14 are reapposed in curing box 21, setting so that
Humidity in the curing box 21 is always held at 95%, and initial temperature is 20 DEG C, so that the temperature in the curing box 21 is every
1 DEG C is increased within one hour, until the temperature in the curing box 21 reaches 60 DEG C；
Concrete sample cracking resistance test when situation two, simulation mass concrete temperature variation: pass through temperature and humidity
Regulation and control system 23 automatically adjusts to the temperature and humidity in curing box 21, firstly, making the humidity in the curing box 21
It is maintained at 95%, and makes the temperature in the curing box 21 in 14.8 DEG C of one hours of holding, then, so that the curing box
Increase 1 DEG C within temperature each hour in 21, until the temperature in the curing box 21 is increased to 22.8 DEG C and is kept for a hour,
Then, so that the temperature in the curing box 21 is successively increased to 23.6 DEG C, 26 DEG C, 29 DEG C, 30.5 DEG C, 35.8 DEG C and each self-insurance
It holds 160 minutes, 440 minutes, 2 hours, 24 hours and 21 hours；
In the above temperature and humidity change procedure, reach for 24 hours~48h when time of the concrete sample 3 in curing box 21
When, the circular external mold 12 of 3 periphery of concrete sample is removed, concrete sample 3 and temperature expansion circle that solidification is integrated are retained
Ring internal model 11 unclamps strainer 16, makes concrete sample 3 and temperature expansion annulus internal model 11 in horizontal expansion direction without constraint.
Under the different temperature and humidity situation of change of both the above, multiple microstrain sensor 4a in real time to temperature change when make temperature
The ess-strain that degree expansion annulus internal model 11 generates is periodically detected, and detected signal is exported to signal condition
Circuit module 4b, signal conditioning circuit module 4b amplify each microstrain sensor 4a signal exported, filter and
After A/D conversion process output give microprocessor module 4c, firstly, the microprocessor module 4c call middle position value filtering module and
According to conventional middle position value filtering method, to through signal conditioning circuit module 4b, treated that each microstrain sensor 4a is detected
The signal arrived carries out middle position value filtering processing；Then, the microprocessor module 4c calls multisensor data fusion processing mould
Block and according to conventional adaptive weighting data fusion algorithm to multiple through middle position value filtering treated microstrain sensor 4a
Detected signal carries out multisensor data fusion processing, and accordingly obtains what the temperature expansion annulus internal model 11 generated
Stress-strain data, that is to say, that obtained temperature expansion detected by each microstrain sensor 4a after being filtered
The stress-strain data that annulus internal model 11 generates；Then, the microprocessor module 4c obtained after being filtered
The stress-strain data that temperature expansion annulus internal model 11 detected by each microstrain sensor 4a generates is exported to computer
4d is shown；
Finally, the computer 4d calls aggregation of data analysis and processing module to the received temperature expansion annulus
The stress-strain data that internal model 11 generates carries out comprehensive analysis processing, obtains the stress that the temperature expansion annulus internal model 11 generates
The curve that strain data changes over time, when the stress-strain data that the temperature expansion annulus internal model 11 generates mutates
When, illustrate that concrete sample 3 is cracked, at this point, recording the time that concrete sample 3 cracks.
If concrete sample 3 does not crack, if concrete sample 3 does not crack, handled by computer 4d
The strain value that data record concrete sample 3 generates during the test, operator just use temperature expansion annulus internal model 11 to produce
Curve that raw stress-strain data changes over time evaluates crack-resistant performance of concrete；If concrete sample 3 cracks, behaviour
Make personnel and just evaluates crack-resistant performance of concrete with the time that concrete sample 3 cracks, and fracture width can use people
The mode of work microscope reading is observed.
The above is only presently preferred embodiments of the present invention, is not intended to limit the invention in any way, it is all according to the present invention
Technical spirit any simple modification, change and equivalent structure transformation to the above embodiments, still fall within skill of the present invention
In the protection scope of art scheme.
Claims (10)
1. concrete sample temperature crazing-resistance test device, it is characterised in that: including swollen for concrete sample (3) molding temperature
Swollen charging assembly (1) and the curing means (2) for being used to conserve the concrete sample (3), and for concrete
The intelligent observing and controlling system (4) that the cracking resistance of test specimen (3) is detected and is used to be monitored the curing means (2)；
The temperature expansion charging assembly (1) includes the temperature expansion annulus internal model (11) expanded for varying with temperature
With for being sleeved on the circular external mold (12) of temperature expansion annulus internal model (11) periphery, and for carrying the temperature
Expand annulus internal model (11) and it is described annular shape external mold (12) bottom plate (14), the temperature expansion annulus internal model (11) with it is described
The annular space for containing concrete sample (3) is constituted between circular external mold (12).
2. concrete sample temperature crazing-resistance test device according to claim 1, it is characterised in that: the temperature expansion circle
The temperature expansion coefficient of ring internal model (11) is greater than 20 × 10-6/ DEG C and elastic module be not less than 72GPa.
3. concrete sample temperature crazing-resistance test device according to claim 1, which is characterized in that the curing means
(2) include:
Curing box (21), for holding concrete temperature expansion charging assembly (1) for forming concrete sample (3)；
Temperature-adjusting device (25), for the temperature in curing box (21) to be adjusted and then to the concrete sample (3)
Realize that temperature is adjusted, left and right side of the cold wind or hot wind that the temperature-adjusting device (25) exports from the curing box (21)
Even into curing box (21)；
Humidity control apparatus (26), for being adjusted to the humidity in curing box (21) and then being realized to concrete sample (3)
Humidity regulation, the humidity control apparatus (26) spray water vapour by way of from top to bottom into the curing box (21).
4. concrete sample temperature crazing-resistance test device according to claim 3, it is characterised in that: the curing box (21)
Left plate (21a) on offer left air inlet (21c), offer right air inlet on the right side plate (21b) of the curing box (21)
Mouthful (21d) is provided with cold wind or hot wind for export the temperature-adjusting device (25) on the left plate (21a) and conveys
To the left blast pipe (21e) of the left air inlet (21c), it is provided on the right side plate (21b) for adjusting the temperature
The cold wind or hot wind of device (25) output are delivered to the right blast pipe (21f) of the right air inlet (21d), the left plate
It is provided with left clapboard (21g) on the inside of (21a), is provided with right clapboard (21h), the left plate on the inside of the right side plate (21b)
All have gap between (21a) and left clapboard (21g) and between the right side plate (21b) and right clapboard (21h), it is described it is left every
It offers multiple air pushing holes (21j) on plate (21g) and the right clapboard (21h), is set on the back side panel of the curing box (21)
It is equipped with air outlet (21k), is provided in the curing box (21) for holding concrete temperature expansion charging assembly (1) and coagulation
Native test specimen (3) holds plate (21u).
5. concrete sample temperature crazing-resistance test device according to claim 4, it is characterised in that: the temperature adjusts dress
Setting (25) includes refrigerating plant (25a), heating device (25b) and two-position three way magnetic valve (25c), the refrigerating plant (25a)
Cold air outlet be connected by the first blast pipe (25d) with an entrance of the two position three-way valve (25c), heating dress
The outlet for setting (25b) is connected by the second blast pipe (25e) with another entrance of the two position three-way valve (25c), described
The outlet of two position three-way valve (25c) is connected by third blast pipe (25f) with the left blast pipe (21e), and described two three
The outlet of port valve (25c) is connected by the 4th blast pipe (25g) with the right blast pipe (21f)；On the curing box (21)
Air outlet (21k) be connected with air-exhausting duct (25h), the air-exhausting duct (25h) by the first backwind tube (25j) and the refrigeration dress
The return air inlet for setting (25a) is connected, and the air-exhausting duct (25h) passes through the second backwind tube (25k) and the heating device (25b)
Return air inlet is connected, and the first electromagnetism two-port valve (25m), second backwind tube are provided on first backwind tube (25j)
The second electromagnetism two-port valve (25n) is provided on (25k)；Left blower (25s), the right side are provided on the left blast pipe (21e)
Right blower (25t) is provided on blast pipe (21f).
6. concrete sample temperature crazing-resistance test device according to claim 5, it is characterised in that: the humidity regulation dress
(26) are set to include water tank (26a), the electric moistening device (26b) being connected with the water tank (26a) and be laid in the curing box
(21) the horizontal distribution pipe (26c) in, the horizontal distribution pipe (26c) pass through steam pipe (26f) and the electric moistening device (26b)
Delivery outlet be connected, multiple steam for from top to bottom spraying steam are provided on the horizontal distribution pipe (26c) and are sprayed
Head (26d).
7. concrete sample temperature crazing-resistance test device according to claim 6, it is characterised in that: the humidity regulation dress
(26) are set to further include the first three-way solenoid valve (26p), the second three-way solenoid valve (26q) and be used for in the air-exhausting duct (25h)
The dehumidification device (26r) that dehumidifies of gas, first three-way solenoid valve (26p) and the second three-way solenoid valve (26q) are equal
It is serially connected on the air-exhausting duct (25h), first three-way solenoid valve (26p) is connected with the entrance of the dehumidification device (26r)
Logical, second three-way solenoid valve (26q) is connected with the outlet of the dehumidification device (26r).
8. concrete sample temperature crazing-resistance test device according to claim 7, it is characterised in that: the curing means
(2) further include temperature and humidity adjustment control system for being controlled temperature-adjusting device (25) and humidity control apparatus (26)
(23), the temperature and humidity adjustment control system (23) includes main controller module (23a), the main controller module (23a)
Input is terminated with parameter input circuit module (23b) and signal acquisition circuit module (23c), the signal acquisition circuit module
The input of (23c) be terminated with temperature sensor (23d) for being measured in real time to the temperature in the curing box (21) and
Humidity sensor (23e) for being measured in real time to the humidity in the curing box (21), the main controller module
The output of (23a) is terminated with display module (23f), the output end and refrigerating plant (25a) of the main controller module (23a),
Heating device (25b), electric moistening device (26b) and dehumidification device (26r) connect, the left blower (25s), right blower (25t), two
Position-3-way solenoid valve (25c), the first three-way solenoid valve (26p), the second three-way solenoid valve (26q), the first electromagnetism two-port valve (25m)
Connect with main controller module (23a) with the second electromagnetism two-port valve (25n).
9. concrete sample temperature crazing-resistance test device according to claim 8, it is characterised in that: the intelligent monitoring system
System (4) includes the inner wall being arranged in temperature expansion annulus internal model (11) and keeps temperature swollen when being used for and cracking to concrete sample (3)
Microstrain sensor (4a) that the ess-strain that swollen annulus internal model (11) generates is detected connects with microstrain sensor (4a)
And signal conditioning circuit module (4b) for being improved to the signal that microstrain sensor (4a) detects and with the letter
Number conditioning circuit module (4b) connects and for being analyzed and processed to the signal conditioning circuit module (4b) signal exported
Microprocessor module (4c), and connect with microprocessor module (4c) and for being obtained to microprocessor module (4c) processing
The computer (4d) that is analyzed and processed of data, the signal conditioning circuit module (4b) is by the amplifying circuit mould that successively connects
Block (4ba), filter circuit module (4bb), signal time-sharing multiplex circuit module (4bc) and A/D conversion circuit module (4bd) structure
At.
10. a kind of method for carrying out the crazing-resistance test of concrete sample temperature using experimental rig as claimed in claim 9, special
Sign is, comprising the following steps:
Step 1: concrete sample (3) forms: multiple microstrain sensors (4a) are equably pasted onto temperature expansion annulus
On the inner wall of mould (11), and the temperature expansion annulus internal model (11) is placed on bottom plate (14), then by circular external mold
(12) it is sleeved on the periphery of the temperature expansion annulus internal model (11), then, assembled temperature expansion charging assembly (1) is put
It is poured between temperature expansion annulus internal model (11) and circular external mold (12) on standard vibration machine, and by the concrete being stirred
Annular space in；Finally, starting standard vibration machine carries out vibration moulding；
Step 2: experimental rig assembles: firstly, multiple concrete samples (3) after molding are added together with concrete temperature expansion
Component (1) is carried to move entirely into curing box (21)；Then, multiple on temperature expansion annulus internal model (11) inner wall micro- are answered
The output end for becoming sensor (4a) is all connected to the input terminal of signal conditioning circuit module (4b), by the signal conditioning circuit mould
The output end of block (4b) is connected to the input terminal of microprocessor module (4c)；Then, by the defeated of the microprocessor module (4c)
Outlet is connected on computer (4d)；
Step 3: the maintenance and crazing-resistance test of concrete sample (3) are carried out by following two temperature variations respectively:
Situation one, at the uniform velocity concrete sample cracking resistance is tested under Elevated Temperature Conditions: keeping curing box (21) interior temperature is 20 DEG C ± 2
DEG C, relative humidity be greater than 95% by different larval instar requirement carry out standard curing, the different larval instar be 1d, 3d, 7d or 28d；
After demoulding, concrete sample (3) and temperature expansion annulus internal model (11), bottom plate (14) are reapposed in curing box (21),
It is arranged so that the humidity in the curing box (21) is always held at 95%, initial temperature is 20 DEG C, so that the curing box
(21) 1 DEG C is increased within temperature each hour in, until the temperature in the curing box (21) reaches 60 DEG C；
Concrete sample cracking resistance test when situation two, simulation mass concrete temperature variation: pass through temperature and humidity adjustment
Control system (23) automatically adjusts to the temperature and humidity in curing box (21), firstly, making wet in the curing box (21)
Degree is maintained at 95%, and makes the temperature in the curing box (21) in 14.8 DEG C of one hours of holding, then, so that described support
1 DEG C is increased within temperature each hour in protecting box (21), until the temperature in the curing box (21) is increased to 22.8 DEG C and keeps
One hour, then so that the temperature in the curing box (21) be successively increased to 23.6 DEG C, 26 DEG C, 29 DEG C, 30.5 DEG C,
35.8 DEG C and each self-sustaining 160 minutes, 440 minutes, 2 hours, 24 hours and 21 hours；
In the above temperature and humidity change procedure, reach for 24 hours~48h when time of the concrete sample (3) in curing box (21)
When, the circular external mold (12) of concrete sample (3) periphery is removed, concrete sample (3) and temperature that solidification is integrated are retained
It expands annulus internal model (11)；
Under the different temperature and humidity situation of change of both the above, multiple microstrain sensors (4a) in real time to temperature change when make annulus
The ess-strain that shape external mold (12) generates, which is periodically detected and exports detected signal, gives signal conditioning circuit mould
Block (4b), the signal that signal conditioning circuit module (4b) exports microstrain sensor (4a) amplifies, filter and A/D turns
Change processing after output give microprocessor module (4c), firstly, the microprocessor module (4c) call middle position value filtering module and
According to middle position value filtering method, to through signal conditioning circuit module (4b), treated that each microstrain sensor (4a) is detected
Signal carry out middle position value filtering processing, obtain temperature detected by each microstrain sensor (4a) after being filtered
Expand the stress-strain data that annulus internal model (11) generate；Then, the microprocessor module (4c) obtained through filtering
The stress-strain data that temperature expansion annulus internal model (11) detected by treated each microstrain sensor (4a) generates
It exports and is shown to computer (4d)；Finally, the computer (4d) calls aggregation of data analysis and processing module to receive it
The stress-strain data that the temperature expansion annulus internal model (11) arrived generates carries out comprehensive analysis processing, and it is swollen to obtain the temperature
The curve that the stress-strain data that swollen annulus internal model (11) generates changes over time, when the temperature expansion annulus internal model (11) produces
When raw stress-strain data mutates, illustrate that concrete sample (3) is cracked, at this point, recording concrete sample
(3) time cracked handles obtained data record by computer (4d) if concrete sample (3) does not crack
The strain value that concrete sample (3) generates during the test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910333904.9A CN109975346A (en) | 2019-04-24 | 2019-04-24 | Concrete sample temperature crazing-resistance test device and test method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910333904.9A CN109975346A (en) | 2019-04-24 | 2019-04-24 | Concrete sample temperature crazing-resistance test device and test method |
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| CN111709161A (en) * | 2020-04-27 | 2020-09-25 | 中国水利水电科学研究院 | Concrete panel drying shrinkage analysis and control method |
| CN111912686A (en) * | 2020-08-11 | 2020-11-10 | 中南大学 | Concrete hydrothermal curing and stress-strain integrated testing device and testing method thereof |
| CN112834564A (en) * | 2021-03-02 | 2021-05-25 | 中国海洋大学 | Testing device and method for adjusting soil body temperature |
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