CN110006762A - A kind of freeze thawing-lower concrete durability experiment device and method of load synergistic effect - Google Patents
A kind of freeze thawing-lower concrete durability experiment device and method of load synergistic effect Download PDFInfo
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- 238000002474 experimental method Methods 0.000 title claims abstract description 35
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- 230000002195 synergetic effect Effects 0.000 title claims description 8
- 238000010257 thawing Methods 0.000 claims abstract description 165
- 238000012360 testing method Methods 0.000 claims abstract description 103
- 239000007788 liquid Substances 0.000 claims abstract description 80
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 48
- 238000005057 refrigeration Methods 0.000 claims abstract description 23
- 238000005485 electric heating Methods 0.000 claims abstract description 19
- 238000003825 pressing Methods 0.000 claims abstract description 16
- 238000004458 analytical method Methods 0.000 claims abstract description 4
- 239000010720 hydraulic oil Substances 0.000 claims description 21
- 239000003921 oil Substances 0.000 claims description 18
- 238000012545 processing Methods 0.000 claims description 17
- 230000005611 electricity Effects 0.000 claims description 5
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- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 2
- 239000012530 fluid Substances 0.000 claims description 2
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- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 230000008014 freezing Effects 0.000 description 5
- 238000007710 freezing Methods 0.000 description 5
- 230000015271 coagulation Effects 0.000 description 4
- 238000005345 coagulation Methods 0.000 description 4
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- 239000000203 mixture Substances 0.000 description 3
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- 235000013399 edible fruits Nutrition 0.000 description 1
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- 239000011372 high-strength concrete Substances 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
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Abstract
Concrete durability experiment device under freeze thawing of the invention-load acts synergistically, including test device, constant hydraulic source device and control circuit, test device includes freeze thawing case, test piece box, jack, movable pressing board, gag lever post, electric refrigeration train and electric heating group, concrete sample is placed in test piece box, gag lever post limits the two sides of concrete sample, and jack is set to the top of freeze thawing case；Inlet tube and outlet tube is set in test piece box, freeze thawing liquid is set on freeze thawing case into and out of pipe.Concrete durability experiment method of the invention include: a) make test specimen；B) places test specimen；C) equipment connects；D) applies permanent load；E) is passed through water and freeze thawing liquid；F) Frozen-thawed cycled controls；G) analysis of experiments.Concrete durability experiment device of the invention, can Frozen-thawed cycled-load of automatic implementation concrete sample act synergistically lower concrete durability experiment, beneficial effect is significant, is suitable for the application of popularization.
Description
Technical field
The present invention relates to a kind of concrete durability experiment device and methods, more specifically, more particularly to a kind of freeze thawing-
Concrete durability experiment device and method under load acts synergistically.
Background technique
Concrete is the engineering material being most widely used in infrastructure construction in china.For being in the water of cold district
Work concrete structure, the lasting synergistic effect by load and Frozen-thawed cycled, leads to concrete structure from outward appearance to inner essence during one's term of military service
Accumulative damage, reduce the security performance of structure, may cause when serious concrete structure failure collapse, cause huge personnel
Injures and deaths and economic loss.Therefore, using reasonable experimental rig and method, to the coagulation under load-Frozen-thawed cycled synergistic effect
Soil structure durability is studied, and is the hot issue of current domestic and foreign scholars' concern.
It is found by these retrieval: I) Sun W, Zhang Y M, Yan H D, et al. Damage and
damage resistance of high strength concrete under the action of load and
freeze-thaw cycles[J]. Cement and Concrete Research, 1999, 29(9): 1519-1523;
Ⅱ)Petersen L, Lohaus L, Polak M A. Influence of freezing-and-thawing damage
on behavior of reinforced concrete elements[J]. ACI Materials Journal, 2007,
104(4): 369-378;III) Liang Lili Frozen-thawed cycled acts on lower mechanical performance of concrete experimental study [J] concrete,
2012(3):55-57;IV) Qingdao study of coupling effect [D] the science and engineering that continuing load-freeze thawing deteriorates concrete durability
University, 2018. the studies above analyze the influence of Frozen-thawed cycled and load to durability of concrete structures, it is indicated that multifactor
Influence to concrete durability is not the simple superposition of single factors effect, it is necessary to fully consider various enduring factors it
Between coupling.Therefore, durable Journal of Sex Research is carried out for the Hydro-concrete Structures of cold district, considers that load-freeze thawing follows
The synergistic effect of ring has important theory and engineering significance.
The endurance issues of lower concrete structure are acted in order to study load and Frozen-thawed cycled, top priority is to establish to close
Reason, efficient test method system.Publication No. CN206930527U, invention and created name are a kind of " concrete Frozen-thawed cycled
Combined the unit with axial compression " Chinese patent document, disclose at a kind of freeze thawing recycled first to concrete sample
Reason, in the combination unit for carrying out axial compressive force test to it, main component includes concrete freeze thawing case, jack controller and liquid
Double claw clip pincers etc. are pressed, the dead load of concrete sample is applied by jack, and the Frozen-thawed cycled of test specimen is realized by freeze thawing case.
However the technical solution of the application, it is acted on while there is no in view of freeze thawing with load, and the shadow caused by concrete sample
It rings.
The Chinese patent of Publication No. CN109374420A discloses coagulation under a kind of load and Frozen-thawed cycled collective effect
Native durability test device, the device is by tightening runner and trapezoidal screw on fixed frame, to the concrete under freezing-thawing
Test specimen applies stable load.Although the device can compensate test specimen load by periodic adjustment runner, adjust every time
Runner is saved to compensate load difference, error is larger, and the increase for compensating number will lead to the continuous accumulation of loaded errors, is unable to satisfy
It is continuously applied the requirement of steady load.In addition, observation and compensation process are cumbersome repeatedly, more man power and material is expended, is automated
Degree is low.Therefore, it is necessary to invent a kind of multifactor concrete durability experiment device and method of automatic compensation load.
Summary of the invention
The present invention in order to overcome the shortcomings of the above technical problems, provides a kind of freeze thawing-lower concrete of load synergistic effect
Durability test device and method.
Freeze thawing of the invention-load acts synergistically lower concrete durability experiment device, including test device, constant hydraulic
Source device and control circuit, it is characterised in that: test device include freeze thawing case, test piece box, jack, movable pressing board, gag lever post,
Electric refrigeration train and electric heating group, test piece box are located in the internal cavities of freeze thawing case, the upper end opening of test piece box, coagulation to be tested
Native test specimen is placed in test piece box；The quantity of gag lever post is two or more, is offered on movable pressing board for gag lever post
The directed cavity passed through, gag lever post limit the two sides of concrete sample, and jack is set to the top of freeze thawing case, activity pressure
For plate between jack and concrete sample, constant hydraulic source device provides hydraulic power to jack；
The water inlet pipe and outlet pipe for filling the water, draining into its inner cavity, test specimen box outer wall and freeze thawing chamber interior wall are provided in test piece box
Between form freeze thawing chamber, be provided on freeze thawing case and injected into freeze thawing chamber and the freeze thawing liquid inlet pipe of freeze thawing liquid is discharged and freeze thawing liquid goes out
Pipe；Electric refrigeration train, electric heating group are all set on freeze thawing case, and the freeze thawing liquid in freeze thawing chamber is freezed and heated respectively.
Concrete durability experiment device under freeze thawing of the invention-load acts synergistically, the bottom of the test piece box, freeze thawing
The top of case offers the guide groove that the lower end of gag lever post and upper end are limited and be oriented to respectively, the both ends of gag lever post with
It is connected through tension spring between the inner wall of guide groove.
Concrete durability experiment device under freeze thawing of the invention-load acts synergistically, a side of the freeze thawing case
For the closed transparent doors convenient for being observed its internal state, the temperature measured to freeze thawing liquid temperature is provided on freeze thawing case
Sensor is spent, is provided with solenoid valve in the water inlet pipe, outlet pipe, freeze thawing liquid inlet pipe and freeze thawing liquid outlet pipe.
Freeze thawing of the invention-load acts synergistically lower concrete durability experiment device, the constant hydraulic source device by
Hydraulic oil container, motor, current divider and pressure sensor composition, motor is set on hydraulic oil container, for being promoted in hydraulic oil container
Hydraulic fluid pressure, hydraulic oil container through current divider to jack provide it is hydraulic, pressure sensor is set on current divider, for examining
Survey the pressure of current divider oil outlet；
The control circuit is made of signal processing module and controller, enhanced processing of the pressure sensor through signal processing module
After be input to controller, the output end of controller and control terminal, control terminal, the control terminal of electric heating group of electric refrigeration train of motor
It is connected.
The test method of concrete durability experiment device under freeze thawing of the invention-load acts synergistically, which is characterized in that
It is realized by following steps:
A) makes test specimen, according to the match ratio of concrete sample, the satisfactory concrete sample of manufactured size, and supported
Shield, it is ensured that test specimen upper and lower surface is smooth, without damaged slight crack；
B) places test specimen, opens the closed transparent doors of freeze thawing case, concrete sample is placed in test piece box, and ensure test specimen
Between the limit plate of the left and right sides, movable pressing board is located at the top of test specimen, is then shut off closed transparent doors；
C) equipment connects, and current divider is connected through oil inlet pipe and oil return pipe with jack, by the corresponding port of controller and pressure
Force snesor, temperature sensor, the mechanical, electrical refrigeration train of electricity, electric heating group are connected；
D) applies permanent load, starts the motor on hydraulic oil container, the load that jack pair concrete sample applies is risen to examination
Specified value is tested, the pressure value of jack can be transferred to signal processing module by pressure sensor, and signal processing module passes pressure
The signal of sensor transmitting passes to controller through amplification, and collected signal is analyzed and processed by controller, when applied lotus
The error of load is more than controller starting motor, to guarantee that concrete sample is in constant pressure state after specified value；
E) is passed through water and freeze thawing liquid, closes the solenoid valve in freeze thawing liquid outlet pipe, the solenoid valve on freeze thawing liquid inlet pipe is opened, to jelly
Melt and be passed through freeze thawing liquid in chamber, by the scale in observation closing transparent doors, until freeze thawing liquid height reaches preset height；It closes out
The solenoid valve on solenoid valve, opening water inlet pipe on water pipe, water is passed through into test piece box, by observing the scale on closing door,
Until the water level in test piece box reaches preset height；
F) Frozen-thawed cycled controls, and controls freeze thawing liquid temperature in freeze thawing case by electric refrigeration train, passes through the temperature sensing in freeze thawing case
The temperature value of device outflow effectively controls the temperature in freeze thawing case, when freeze thawing liquid reaches required cryogenic temperature, closes refrigeration
Unit, and keep cryogenic temperature for a period of time；
Then, start electric heating group, the temperature of water is improved by improving the temperature of freeze thawing liquid, when freeze thawing liquid reaches required system
When hot temperature, electric heating group is closed, and is kept for a period of time, so that the concrete sample in test piece box melts, completes primary freeze
Melt circulation；According to given requirement of experiment, reach defined freezing-thawing cycles；
G) analysis of experiments after the completion of entire freeze thawing-loading test, closes the motor on hydraulic oil container, and jack is made to restore former
Shape；The solenoid valve on freeze thawing liquid outlet pipe and outlet pipe is opened, freeze thawing liquid and water are excluded, until freeze thawing liquid and water all discharge it
Afterwards, freeze thawing case is opened, the measurement of mass loss and the relative dynamic elastic modulus loss of concrete sample is carried out.
Freeze thawing of the invention-load acts synergistically the test method of concrete durability experiment device, institute in step a)
The concrete sample of production is 150mm × 150mm × 150mm cube, the perseverance applied in step d) to concrete sample
Determine load and is not less than 0.3MPa, when the pressure for detecting jack by pressure sensor reduces the 0.1% of permanent load,
Then start motor to be pressurized；The temperature range that Frozen-thawed cycled controls in step f) is -20 DEG C~60 DEG C.
The beneficial effects of the present invention are: concrete durability experiment device of the invention, is tried by being arranged in freeze thawing case
Part case, concrete sample to be tested are placed in test piece box, water are passed through in test piece box to simulate freezing-thawing locating for test specimen,
Freeze thawing liquid is passed through between test piece box and freeze thawing case, to be controlled by the temperature to freeze thawing liquid, water and examination in Lai Shixian test piece box
The icing and thawing of part realize the Frozen-thawed cycled simulation of cold district locating for concrete sample；By being arranged in test piece box
Limit plate realizes the positioning to test specimen, and during the jack pair concrete sample pressure that ensure that top, test specimen will not
It moves, is conducive to the Frozen-thawed cycled-lower concrete durability experiment of load synergistic effect for implementing concrete sample, beneficial to effect
Fruit is significant, is suitable for the application of popularization.
Detailed description of the invention
Fig. 1 is the structure principle chart of concrete durability experiment device of the invention；
Fig. 2 is the structural schematic diagram of test device in the present invention；
Fig. 3 is the structural schematic diagram of constant hydraulic source device in the present invention；
Fig. 4 is the structural schematic diagram of movable pressing board in the present invention；
Fig. 5 is the working principle diagram for applying permanent load in the present invention to concrete sample；
Fig. 6 is that difference answers the mass loss of concrete sample under pressure with the situation of change of freezing-thawing cycles；
Fig. 7 is that difference answers the relative dynamic elastic modulus of concrete sample under pressure to lose the situation of change with freezing-thawing cycles.
In figure: 1 freeze thawing case, 2 test piece boxes, 3 jack, 4 movable pressing boards, 5 gag lever posts, 6 water inlet pipes, 7 outlet pipes, 8 freeze thawing
Liquid inlet pipe, 9 freeze thawing liquid outlet pipes, 10 electric refrigeration trains, 11 electric heating groups, 12 guide grooves, 13 tension springs, 14 water bodys, 15 freeze thawing liquid,
16 oil inlet pipes, 17 oil return pipes, 18 concrete samples, 19 hydraulic oil containers, 20 motors, 21 current dividers, 22 pressure sensors, 23 pressure
Table, 24 oil tank base supports, 25 signal processing modules, 26 controllers, 27 line banks, 28 directed cavities, 29 temperature sensors, 30 electromagnetism
Valve.
Specific embodiment
The invention will be further described with embodiment with reference to the accompanying drawing.
As shown in Figure 1, giving the structure principle chart of concrete durability experiment device of the invention, Fig. 2 gives this
The structural schematic diagram of test device in invention, Fig. 3 give the structural schematic diagram of constant hydraulic source device in the present invention, the present invention
Concrete durability experiment device be made of test device, constant hydraulic source device and control circuit, test device is to coagulation
Native test specimen 18 carries out pressure and circulating freezing resistance, and for constant hydraulic source device for providing pressure constant pressure oil, control circuit is real
The measurement of existing pressure, temperature signal, and control test device and permanent load is applied to test specimen and carries out circulating freezing resistance processing, control
It makes constant hydraulic source device and constant pressure is provided.
Shown in test device by freeze thawing case 1, test piece box 2, jack 3, movable pressing board 4, gag lever post 5, water inlet pipe 6, go out
Water pipe 7, freeze thawing liquid inlet pipe 8, freeze thawing liquid outlet pipe 9, electric refrigeration train 10, electric heating group 11 form, and the inside of freeze thawing case 1 is cavity,
It is provided with sealed transparent door on freeze thawing case 1, to open sealed transparent behind the door, is put into concrete sample 18, and sealing can be passed through
Transparent doors observe the liquid level of freezing liquid, water.Test piece box 2 is located at the bottom of freeze thawing case 1, and the inside of test piece box 2 is to place concrete
The cavity of test specimen 18, test piece box 2 are the annular of upper end opening, the inside water flowing of test piece box 2, the outer wall and freeze thawing case 1 of test piece box 2
Inner wall between for storage freeze thawing liquid freeze thawing chamber.
It is provided with the left and right distribution two-by-two of 4 gag lever posts, 5,4 gag lever posts 5 in test piece box 2, and passes through movable pressing board 4, such as schemes
Shown in 4, give the structural schematic diagram of movable pressing board in the present invention, shown in offer 4 on movable pressing board and rectangular lead
To chamber 28, the bottom of test piece box 2 offers 4 guide grooves, and 4 guide grooves 12,4 limits are offered on the roof of freeze thawing case 1
The top and bottom of bar 5 are inserted into guide groove 12, and the top and bottom of gag lever post 5 and the side wall of guide groove 12 are through tension spring
13 are connected, after between the gag lever post 5 that concrete sample 18 is put into two sides, the work of the gag lever posts 5 of two sides in tension spring 13
Under, the clamping positioning action to concrete sample 18 is realized.Jack 3 is fixed on the top of freeze thawing case 1, and movable plate 4 is located at
Between concrete sample 18 and jack 3, jack 3 answers pressure to 18 test specimen of concrete sample through movable pressing board 4.
The top of test piece box 2 is communicated with the outside world through water inlet pipe 6, and lower part is communicated with the outside world through outlet pipe 7, will pass through into water
Pipe 6 is into test piece box 2 plus water, test release water through outlet pipe 7 after finishing.The top of freeze thawing chamber is through freeze thawing liquid inlet pipe 8 and outside
Boundary communicates, and lower part is communicated with the outside world through freeze thawing liquid outlet pipe 9, to fill freeze thawing liquid 15 into freeze thawing chamber through freeze thawing liquid inlet pipe 8, freezes
Melt liquid 15 with the characteristic under high temperature, cryogenic conditions being liquid condition；After test, freeze thawing liquid 15 is through freeze thawing liquid outlet pipe 9
Discharge.Solenoid valve is provided in water inlet pipe 6, outlet pipe 7, freeze thawing liquid inlet pipe 8 and freeze thawing liquid outlet pipe 9.
Shown in electricity refrigeration train 10 and electric heating group 11 be all set on freeze thawing case 1, realize respectively freeze thawing liquid refrigeration and
Freeze thawing liquid after heating, refrigeration or heating can be such that the water body 14 of test piece box ties by the heat transfer with water in test piece box 2
Ice and heating, and then realize the freeze thawing of concrete sample 18.Temperature sensor 29 is provided in freeze thawing case 1, for measuring freeze thawing
The temperature of liquid 15.
Shown in constant hydraulic source device by hydraulic oil container 19, motor 20, current divider 21, pressure sensor 22, pressure gauge
23 compositions, motor 20 are set on hydraulic oil container 19, and motor 20 is used to drive the operation of oil pump on hydraulic oil container 19, to promote liquid
The pressure for the hydraulic oil that pressure oil case 19 exports.Current divider 21 is set to the oil circuit output end of hydraulic oil container 19, and hydraulic oil container 19 passes through
Current divider 21 provides pressure oil to jack 3, is connected between current divider 21 and jack 3 through oil inlet pipe 16 and oil return pipe 17.
Pressure sensor 22 and pressure gauge 23 are provided on current divider 21, pressure gauge 23 is pressed for showing the pressure for being input to jack 3
Force snesor 22 is used to detect the pressure size of 21 output end of current divider.
Shown in control circuit be made of signal processing module 25 and controller 26, signal processing module 25 be used for pressure
The pressure signal that sensor 22 exports amplifies processing, and is input in controller 26.Controller 26 has signal acquisition, number
According to the effect of operation and control output, controller 26 through line bank 27 and motor 20, temperature sensor 29, each solenoid valve 30,
Electric refrigeration train 10 is connected with electric heating group 11, and to realize that the temperature to freezing liquid measures, test piece box 2 adds water and waterproof,
Freeze thawing chamber adds freeze thawing liquid and row's freeze thawing liquid, and control to freeze and heat, and completes under constant pressure under automatic control effect
The freezing and thawing test of concrete sample.
The test method of concrete durability experiment device, passes through following step under freeze thawing of the invention-load acts synergistically
It is rapid to realize:
A) makes test specimen, according to the match ratio of concrete sample, the satisfactory concrete sample of manufactured size, and supported
Shield, it is ensured that test specimen upper and lower surface is smooth, without damaged slight crack；
In the step, made concrete sample is 150mm × 150mm × 150mm cube.
B) places test specimen, opens the closed transparent doors of freeze thawing case, concrete sample is placed in test piece box, and is ensured
Test specimen is located between the limit plate of the left and right sides, and movable pressing board is located at the top of test specimen, is then shut off closed transparent doors；
C) equipment connects, and current divider is connected through oil inlet pipe and oil return pipe with jack, by the corresponding port of controller and pressure
Force snesor, temperature sensor, the mechanical, electrical refrigeration train of electricity, electric heating group are connected；
D) applies permanent load, starts the motor on hydraulic oil container, the load that jack pair concrete sample applies is risen to examination
Specified value is tested, the pressure value of jack can be transferred to signal processing module by pressure sensor, and signal processing module passes pressure
The signal of sensor transmitting passes to controller through amplification, and collected signal is analyzed and processed by controller, when applied lotus
The error of load is more than controller starting motor, to guarantee that concrete sample is in constant pressure state after specified value；
As shown in figure 5, the working principle diagram for applying permanent load in the present invention to concrete sample is given, it is right in the step
The permanent load that concrete sample is applied is not less than 0.3MPa, when the pressure for detecting jack by pressure sensor reduces
When the 0.1% of permanent load, then starts motor and be pressurized.
E) is passed through water and freeze thawing liquid, closes the solenoid valve in freeze thawing liquid outlet pipe, opens the solenoid valve on freeze thawing liquid inlet pipe,
Freeze thawing liquid is passed through into freeze thawing chamber, by the scale in observation closing transparent doors, until freeze thawing liquid height reaches preset height；It closes
It closes the solenoid valve on outlet pipe, open the solenoid valve on water inlet pipe, water is passed through into test piece box, pass through the quarter on observation closing door
Degree, until the water level in test piece box reaches preset height；
F) Frozen-thawed cycled controls, and controls freeze thawing liquid temperature in freeze thawing case by electric refrigeration train, passes through the temperature sensing in freeze thawing case
The temperature value of device outflow effectively controls the temperature in freeze thawing case, when freeze thawing liquid reaches required cryogenic temperature, closes refrigeration
Unit, and keep cryogenic temperature for a period of time；
Then, start electric heating group, the temperature of water is improved by improving the temperature of freeze thawing liquid, when freeze thawing liquid reaches required system
When hot temperature, electric heating group is closed, and is kept for a period of time, so that the concrete sample in test piece box melts, completes primary freeze
Melt circulation；According to given requirement of experiment, reach defined freezing-thawing cycles；
In the step, the temperature range of Frozen-thawed cycled control is -20 DEG C~60 DEG C.
G) analysis of experiments after the completion of entire freeze thawing-loading test, closes the motor on hydraulic oil container, restores jack
Original state；The solenoid valve on freeze thawing liquid outlet pipe and outlet pipe is opened, freeze thawing liquid and water are excluded, until freeze thawing liquid and water all discharge it
Afterwards, freeze thawing case is opened, the measurement of mass loss and the relative dynamic elastic modulus loss of concrete sample is carried out.
In test, match ratio used in concrete sample are as follows: cement -280kg/m3, water -160kg/m3, sand -680kg/m3、
Rubble -1127kg/m3, flyash -185kg/m3.By above-mentioned match ratio, raw material are stirred evenly using blender, by mix
In good concreting to cube mold, 30s is vibrated by shake table, is demoulded after standing 1 day, then puts test specimen
Enter standard thermostatic, carry out maintenance in 28 days in constant moisture culturing box after take out, controlled at 20 ± 2 DEG C, relative humidity is greater than 95%.
Check experiment is carried out using two concrete samples 18, and is respectively applied to 0 and 0.3MPa, two compression, is rested
The concrete sample protected is put into this experimental rig, carries out fast freeze-thaw cyclic test, after 50 Frozen-thawed cycleds of every progress, by test specimen
It takes out, measures its mass loss and relative dynamic elastic modulus loss, obtain difference as shown in FIG. 6 and answer concrete sample under pressure
Mass loss answer the opposite of concrete sample under pressure with the situation of change and difference shown in Fig. 7 of freezing-thawing cycles
Dynamic modulus of elasticity loses the situation of change with freezing-thawing cycles.As it can be seen that in the case of identical freezing-thawing cycles, concrete sample
Suffered answers pressure bigger, and mass loss and relative dynamic elastic modulus loss are also bigger；Same concrete sample, freeze thawing
Cycle-index is more, and mass loss and relative dynamic elastic modulus loss are also bigger.
Claims (6)
- The lower concrete durability experiment device 1. a kind of freeze thawing-load acts synergistically, including test device, constant hydraulic source device And control circuit, it is characterised in that: test device include freeze thawing case (1), test piece box (2), jack (3), movable pressing board (4), Gag lever post (5), electric refrigeration train (10) and electric heating group (11), test piece box are located in the internal cavities of freeze thawing case, test piece box it is upper End opening, concrete sample to be tested are placed in test piece box；The quantity of gag lever post be two or more, movable pressing board On offer the directed cavity (28) passed through for gag lever post, gag lever post limits the two sides of concrete sample, and jack is set It is placed in the top of freeze thawing case, between jack and concrete sample, constant hydraulic source device mentions movable pressing board to jack For hydraulic power；The water inlet pipe (6) and outlet pipe (7) for filling the water, draining into its inner cavity, test specimen box outer wall and jelly are provided in test piece box (2) Melt formation freeze thawing chamber between chamber interior wall, the freeze thawing liquid inlet pipe that freeze thawing liquid is injected and be discharged into freeze thawing chamber is provided on freeze thawing case (8) and freeze thawing liquid outlet pipe (9)；Electric refrigeration train, electric heating group are all set on freeze thawing case, respectively to the freeze thawing liquid in freeze thawing chamber into Row refrigeration and heating.
- The lower concrete durability experiment device 2. freeze thawing according to claim 1-load acts synergistically, it is characterised in that: The bottom of the test piece box (2), the top of freeze thawing case (1), which offer, respectively limits the lower end and upper end of gag lever post (5) The guide groove (12) of position and guiding, is connected through tension spring (13) between the both ends of gag lever post and the inner wall of guide groove.
- The lower concrete durability experiment device 3. freeze thawing according to claim 1 or 2-load acts synergistically, feature exist In: a side of the freeze thawing case (1) is the closed transparent doors convenient for being observed its internal state, is arranged on freeze thawing case There are the temperature sensor (29) measured to freeze thawing liquid temperature, the water inlet pipe (6), outlet pipe (7), freeze thawing liquid inlet pipe (8) With solenoid valve (30) are provided in freeze thawing liquid outlet pipe (9).
- The lower concrete durability experiment device 4. freeze thawing according to claim 1 or 2-load acts synergistically, feature exist In: the constant hydraulic source device is made of hydraulic oil container (19), motor (20), current divider (21) and pressure sensor (22), Motor is set on hydraulic oil container, and for promoting the hydraulic fluid pressure in hydraulic oil container, hydraulic oil container is through current divider to jack (3) offer is hydraulic, and pressure sensor is set on current divider, for detecting the pressure of current divider oil outlet；The control circuit is made of signal processing module (25) and controller (26), and pressure sensor is through signal processing module Controller is input to after enhanced processing, output end and the control terminal of motor, the control terminal of electric refrigeration train (10), the electricity of controller add The control terminal of hot group (11) is connected.
- 5. a kind of based on freeze thawing described in claim 1-load synergistic effect lower concrete durability experiment device test side Method, which is characterized in that realized by following steps:A) makes test specimen, according to the match ratio of concrete sample, the satisfactory concrete sample of manufactured size, and supported Shield, it is ensured that test specimen upper and lower surface is smooth, without damaged slight crack；B) places test specimen, opens the closed transparent doors of freeze thawing case, concrete sample is placed in test piece box, and ensure test specimen Between the limit plate of the left and right sides, movable pressing board is located at the top of test specimen, is then shut off closed transparent doors；C) equipment connects, and current divider is connected through oil inlet pipe and oil return pipe with jack, by the corresponding port of controller and pressure Force snesor, temperature sensor, the mechanical, electrical refrigeration train of electricity, electric heating group are connected；D) applies permanent load, starts the motor on hydraulic oil container, the load that jack pair concrete sample applies is risen to examination Specified value is tested, the pressure value of jack can be transferred to signal processing module by pressure sensor, and signal processing module passes pressure The signal of sensor transmitting passes to controller through amplification, and collected signal is analyzed and processed by controller, when applied lotus The error of load is more than controller starting motor, to guarantee that concrete sample is in constant pressure state after specified value；E) is passed through water and freeze thawing liquid, closes the solenoid valve in freeze thawing liquid outlet pipe, the solenoid valve on freeze thawing liquid inlet pipe is opened, to jelly Melt and be passed through freeze thawing liquid in chamber, by the scale in observation closing transparent doors, until freeze thawing liquid height reaches preset height；It closes out The solenoid valve on solenoid valve, opening water inlet pipe on water pipe, water is passed through into test piece box, by observing the scale on closing door, Until the water level in test piece box reaches preset height；F) Frozen-thawed cycled controls, and controls freeze thawing liquid temperature in freeze thawing case by electric refrigeration train, passes through the temperature sensing in freeze thawing case The temperature value of device outflow effectively controls the temperature in freeze thawing case, when freeze thawing liquid reaches required cryogenic temperature, closes refrigeration Unit, and keep cryogenic temperature for a period of time；Then, start electric heating group, the temperature of water is improved by improving the temperature of freeze thawing liquid, when freeze thawing liquid reaches required system When hot temperature, electric heating group is closed, and is kept for a period of time, so that the concrete sample in test piece box melts, completes primary freeze Melt circulation；According to given requirement of experiment, reach defined freezing-thawing cycles；G) analysis of experiments after the completion of entire freeze thawing-loading test, closes the motor on hydraulic oil container, and jack is made to restore former Shape；The solenoid valve on freeze thawing liquid outlet pipe and outlet pipe is opened, freeze thawing liquid and water are excluded, until freeze thawing liquid and water all discharge it Afterwards, freeze thawing case is opened, the measurement of mass loss and the relative dynamic elastic modulus loss of concrete sample is carried out.
- The test method of lower concrete durability experiment device 6. freeze thawing according to claim 5-load acts synergistically, Be characterized in that: made concrete sample is 150mm × 150mm × 150mm cube in step a), to mixed in step d) The permanent load that solidifying soil test specimen is applied is not less than 0.3MPa, when detecting that the pressure of jack reduces by pressure sensor Permanent load 0.1% when, then start motor and be pressurized；The temperature range that Frozen-thawed cycled controls in step f) is -20 DEG C~60 ℃。
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| CN111579375A (en) * | 2020-06-01 | 2020-08-25 | 南京工程学院 | Freezing and thawing box capable of inspecting quality and compressive resistance of test block |
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