CN205280509U - Compression testing machine in concrete material high temperature - Google Patents
Compression testing machine in concrete material high temperature Download PDFInfo
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- CN205280509U CN205280509U CN201521067350.6U CN201521067350U CN205280509U CN 205280509 U CN205280509 U CN 205280509U CN 201521067350 U CN201521067350 U CN 201521067350U CN 205280509 U CN205280509 U CN 205280509U
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Abstract
The utility model provides a compression testing machine in concrete material high temperature, including being used for the loading device who exerts pressure to the concrete sample, the displacement collection system who is used for heating the intensification equipment of concrete sample and is used for measuring the concrete sample deflection. The utility model discloses compression testing machine in concrete material high temperature, with concrete test's intensification equipment with loading device ingenious combination be in the same place, and be aided with displacement collection system, the combined test system that can be used to compression test in the concrete sample high temperature has been formed, realized heating up and loaded synchronization, the environment of concrete in the simulated fire hazard high temperature really, compressive property through this compression testing machine in concrete material high temperature carries out among test result that concrete material test reach and the fire accident and high temperature concrete actual is very close, high temperature and fire proof for research concrete material can provide the guarantee.
Description
Technical field
This utility model relates to a kind of concrete material testing machine for mechanical properties, especially a kind of for the testing machine of comprcssive strength and constitutive relation in the material at high temperature such as normal concrete, fiber concrete, regeneration concrete, high-strength concrete.
Background technology
Concrete is the construction material that in engineering construction, purposes is the widest, consumption is maximum. In recent years, along with concrete material high-rise, towering, big across etc. the going deep into of particular service requirement and harsh and unforgiving environments application, concrete material high temperature fire resistance is proposed new requirement, is badly in need of corresponding high-temperature test facility to research and develop the high temperature fire resistance of concrete material. The separation often of the temperature elevation system of existing concrete high temperature compression test equipment and loading system, concrete anti-compression performance test in proper high temperature can not be carried out, concrete anti-compression performance test in concrete anti-compression performance test and approximate high temperature can only be carried out after high temperature. After high temperature, concrete anti-compression performance test is to be put in heating device to heat concrete material, stops heating, load after concrete material cools down on loading equipemtn after reaching desired value. In approximate high temperature, concrete anti-compression performance test is then after the concrete temperature in heating device reaches desired value, is put on compression testing machine with instruments such as special high temperature-resistant pliers by the concrete material being in the condition of high temperature immediately and loads. Practical application finds, whether compression test after high temperature, or compression test in approximate high temperature, the compressive property that in the concrete high temperature of gained, compression test result is actual with concrete in high temperature of fire all has larger difference.
In order to solve above Problems existing, people are seeking a kind of desirably technical solution always.
Utility model content
Technical staff is through long research of technique, finally find to produce the reason of the problems referred to above, the reason that the compressive property that in concrete high temperature, compression test result is actual with concrete in high temperature of fire differs greatly is in that: owing to the temperature elevation system of compression test equipment in concrete high temperature separates often with loading system, can not realize heating up and working in coordination with of loading, during loading the temperature of concrete sample always in various degree lower than heating time target temperature, concrete sample is in temperature-fall period, outside cooling is fast, internal cooling is slow, thus producing thermal stress gradient, cause the stress damage of concrete material, and then make obtained experimental result produce difference with concrete actual compressive property in high temperature of fire. for concrete anti-compression performance test after high temperature, during loading, concrete temperature is reduced to room temperature, and thermal stress is damaged clearly. for concrete anti-compression performance test in approximate high temperature, although concrete sample loads after taking out from heating device immediately, temperature declines less, but ambient temperature during owing to loading is far below the temperature in heating device, the thermal stress gradient of concrete sample is relatively big, and thermal stress damage is very important equally.
In the process of research and development, technical staff runs into another technical problem, and the displacement meter namely measuring concrete deformation amount is put in heating device and can be burned, and replaces the deflection of concrete sample to there is very big error if being similar to the displacement of high temperature resistant pressure head. Through the unremitting tackling key problem of technical staff, have found the reason causing above-mentioned technical problem: namely in hot environment, high temperature resistant pressure head and cushion block all there will be deformation, and compared with the deformation of concrete sample, the deflection of high temperature resistant pressure head and cushion block is very important.
In addition, existing about test method standard with specification according to China, concrete material performance is (such as, comprcssive strength) it is that the result of the test according to lower 3 concrete samples of the same terms is determined, therefore, it is necessary to solve the problem that 3 identical concrete samples heat up under same high temperature environment and load.
In order to solve above-mentioned technical problem, compression testing machine in the technical scheme is that concrete material high temperature of this utility model, including for executing stressed loading equipemtn, for heating the heating device of concrete sample and for measuring the displacement acquisition device of concrete sample deflection to concrete sample;
Described loading equipemtn includes base, be fixed on this base column, be located on described column and move up and down and position along described column crossbeam, be fixed on the top board bottom crossbeam, be fixed on the high temperature resistant seaming chuck bottom top board, the lower platen being located on described base, the high temperature resistant push-down head being located on described lower platen and for described lower platen being applied the loading power source of upwards active force;
Described heating device includes high temperature furnace bracing frame, be located on this high temperature furnace bracing frame high temperature furnace and the heater being located in high temperature furnace, described high temperature furnace is between described top board and described lower platen, the top board of described high temperature furnace is arranged for described high temperature resistant seaming chuck down through the upper perforation within high temperature furnace, the base plate of described high temperature furnace arranges and upwards penetrates the lower perforation within high temperature furnace, described upper perforation and described lower perforation in the vertical direction just to setting for described high temperature resistant push-down head;
Described displacement acquisition device includes two displacement meters being located on described high temperature resistant seaming chuck, the displacement meter collecting cassette gathering two displacement meter information and two guide rod structures, the high temperature resistant guide rod of one of them guide rod structure is longer than the high temperature resistant guide rod of another guide rod structure, and the top board of described high temperature furnace is provided with the pilot hole of high temperature resistant guide rod traverse described in two confessions two.
Preferably, seaming chuck bearing that described high temperature resistant seaming chuck includes being fixedly arranged on described top board and be fixedly arranged on the seaming chuck body on described seaming chuck bearing, push-down head bearing that described high temperature resistant push-down head includes being fixedly arranged on described lower platen and be fixedly arranged on the push-down head body on described push-down head bearing.
Preferably, described column top is provided with screw thread, and the two ends on described crossbeam rotate and are provided with nut, and described crossbeam is provided with the motor for driving nut rotation described in two, and described crossbeam is by realizing moving up and down and positioning with the threaded engagement of described column.
Preferably, described heating device also includes temperature control system and the temperature sensor being located in described high temperature furnace, and described heater is siliconit, and described temperature control system is connected with described temperature sensor sampling, and described temperature control system electrically connects with described siliconit.
Preferably, the described high temperature resistant guide rod of described stage clip bottom is located at spring base that described guide rod structure includes being located on the bottom surface of described seaming chuck bearing and have stage clip and top, the direction axially outside of described spring base is provided with guide slit, the upper end of described high temperature resistant guide rod arranges horizontal pressing plate, the slip of described horizontal pressing plate is plugged in guide slit and this transverse direction pressing plate is for the probe portion top press-fit with corresponding described displacement meter, and described displacement meter is located on the sidewall of described seaming chuck bearing.
Preferably, also include promoting device, described promotion device includes being located on the plate inner surface of described high temperature furnace and high temperature resistant guide rail vertically disposed with fire door, the high temperature resistant cushion block being located on described push-down head body, sliding is inserted in the catch bar on high temperature furnace sidewall and drives the reciprocating power source of described catch bar, the bottom of described high temperature resistant cushion block is provided with the chute coordinated with described high temperature resistant slide, and described catch bar slides on described high temperature resistant slide rail for promoting described high temperature resistant cushion block.
Preferably, described power source includes electric machine support and the motor being located on electric machine support, described electric machine support includes two the horizontally disposed leading screws being arranged on rear side of described high temperature furnace, and motor drives with the screw on described leading screw and is connected, and is provided with rule by leading screw.
Preferably, also include computer, described computer is connected the displacement signal for gathering displacement meter collecting cassette with described displacement meter collecting cassette information, and described computer controls to be connected to will pass through testing machine control box controlled loading power source and described lower platen applies the load signal of upwards active force acceptance test machine control box feedback with testing machine control box.
This utility model hinge structure has substantive distinguishing features and progress, specifically, compression testing machine in concrete material high temperature, combine ingenious to the heating device of concrete test and loading equipemtn, and it is aided with displacement acquisition device, define and can be used for the comprehensive test system of compression test in concrete sample high temperature, high temperature furnace is located between top board and lower platen by high temperature furnace bracing frame, on high temperature furnace is provided with, lower perforation and pilot hole, make high temperature resistant on, inside push-down head and the high temperature resistant guide rod deep enough high temperature furnace of energy, achieve intensification synchronization with what load, can concrete true environment in simulated fire high temperature, displacement acquisition device adopts two displacement meters and two guide rod structures, gather the change in displacement data at the upper and lower two ends of concrete sample respectively, solve the problem that between collection value and true measurement, error is big well, carry out concrete material compressive property by compression testing machine in this concrete material high temperature and test the result of the test the drawn compressive property actual with concrete in high temperature of fire closely, high temperature and fire resistance for studying concrete material provide guarantee.
Further, column top is provided with screw thread, crossbeam by with the threaded engagement of column realize move up and down and position, simple in construction, very easy to use.
Further, heating device also includes temperature control system and the temperature sensor being located in high temperature furnace, it is possible to design temperature automatically keep design temperature according to demand.
Further, guide rod structure is simple, the movement of high temperature resistant guide rod is converted into the movement of displacement meter probe portion dexterously so that displacement meter can be located at outside high temperature furnace, it is prevented that displacement meter is by high temperature failure or is affected by high temperature and affects certainty of measurement.
Further, device is promoted to make the high temperature resistant cushion block in high temperature furnace to move forward and backward, thus reaching the purpose successively 3 concrete sample high temperature loaded that once heats up, meet the requirement of 3 test specimens of 1 group of compression test of regulation in mechanical performance of concrete test method standard. .
Further, power source includes electric machine support and the motor being located on electric machine support, electric machine support includes two the horizontally disposed leading screws being arranged on rear side of described high temperature furnace, motor drives with the screw on described leading screw and is connected, motor is mobile very convenient on leading screw, rule it is provided with, for the distance monitoring motor and catch bar moves by leading screw.
Further, computer is connected the displacement signal for gathering displacement meter collecting cassette with displacement meter collecting cassette information, and computer controls to be connected to will pass through testing machine control box controlled loading power source and lower platen applies the load signal of upwards active force acceptance test machine control box feedback with testing machine control box.
Accompanying drawing explanation
Fig. 1 is the main TV structure schematic diagram in this utility model embodiment.
Fig. 2 is the side-looking structural representation in this utility model embodiment.
Fig. 3 is the enlarged drawing at Figure 1A place.
Detailed description of the invention
Below by detailed description of the invention, the technical solution of the utility model is described in further detail.
Compression testing machine in concrete material high temperature, as shown in Figures 1 to 3, including for concrete sample being executed stressed loading equipemtn, for heating the heating device of concrete sample, for measuring the displacement acquisition device of concrete sample deflection and the promotion device for promoting concrete sample to move to fire door direction, loading equipemtn includes base 6, it is fixed on the column 7 on this base 6, the crossbeam 9 being located on column 7 and move up and down along column 7 and position, it is fixed on the top board 10 bottom crossbeam, it is fixed on the high temperature resistant seaming chuck bottom top board, it is located at the lower platen 11 on base 6, it is located at the high temperature resistant push-down head on lower platen 11 and for lower platen 11 being applied the loading power source of upwards active force, column 7 upper end is connected by cross bar 8 to increase stability, 1 column 7 top is provided with screw thread, two ends on crossbeam 9 rotate and are provided with nut (not shown), crossbeam 9 is provided with the motor (not shown) for driving nut rotation described in two, crossbeam 9 is by realizing moving up and down and positioning with the threaded engagement of column 7. high temperature resistant seaming chuck includes the seaming chuck bearing 16 being fixedly arranged on top board 10 and the seaming chuck body 14 being fixedly arranged on seaming chuck bearing 16, high temperature resistant push-down head includes the push-down head bearing 17 being fixedly arranged on lower platen 11 and the push-down head body 15 being fixedly arranged on push-down head bearing 17, high temperature resistant seaming chuck and high temperature resistant push-down head are made by silicon nitride combined silicon carbide material, have the excellent properties such as high rigidity, high intensity, high temperature resistant and high temperature creep-resisting, heating device includes high temperature furnace bracing frame 2, the high temperature furnace 1 being located on this high temperature furnace bracing frame 2, the heater being located in high temperature furnace, temperature control system 5 and the temperature sensor 4 be located in high temperature furnace, heater is siliconit, the present embodiment is specially U-shaped siliconit 3, temperature control system 5 is connected with temperature sensor 4 sampling, temperature control system 5 electrically connects with U-shaped siliconit, temperature sensor 4 is corundum thermocouple, the front end of high temperature furnace body of heater has fire door 28, for taking, putting concrete sample 20, fire door has 2 small sircle holes, observes situation in stove when being used for heating and testing. high temperature furnace 1 is between top board 10 and lower platen 17, the top board of high temperature furnace is arranged for high temperature resistant seaming chuck down through the upper perforation within high temperature furnace, the base plate of high temperature furnace arranges and upwards penetrates the lower perforation within high temperature furnace, upper perforation and lower perforation in the vertical direction just to setting for high temperature resistant push-down head, displacement acquisition device includes two displacement meters 22 being located on high temperature resistant seaming chuck, the displacement meter collecting cassette 23 of two displacement meter information of collection and two guide rod structures, the high temperature resistant guide rod 24 of stage clip bottom is located at spring base 30 that guide rod structure includes being located on the bottom surface of seaming chuck bearing 16 and have stage clip 29 and top, the direction axially outside of spring base 30 is provided with guide slit, the upper end of high temperature resistant guide rod arranges horizontal pressing plate 31, horizontal pressing plate 31 slip is plugged in guide slit and this transverse direction pressing plate is for the probe portion top press-fit with corresponding displacement meter, displacement meter is located on the sidewall of seaming chuck bearing 16, the high temperature resistant guide rod of one of them guide rod structure is longer than the high temperature resistant guide rod 24 of another guide rod structure, displacement meter 22 is grating displacement meter, the top board of high temperature furnace 1 is provided with the pilot hole of the high temperature resistant guide rod traverse of two confessions two. device is promoted to include being located on the plate inner surface of high temperature furnace 1 and high temperature resistant guide rail 19 vertically disposed with fire door 28, it is located at the high temperature resistant cushion block 18 on push-down head body 15, slide the catch bar 25 being inserted on high temperature furnace sidewall and the driving reciprocating power source of catch bar 25, the bottom of high temperature resistant cushion block 18 is provided with the chute being slidably matched with high temperature resistant guide rail 19, catch bar is used for promoting high temperature resistant cushion block 18 to slide on high temperature resistant slide rail 19, power source includes electric machine support 27 and the motor 26 being located on electric machine support 27, electric machine support includes two the horizontally disposed leading screws being arranged on rear side of high temperature furnace, motor drives with the screw on described leading screw and is connected, rule it is provided with by leading screw.Computer is connected the displacement signal for gathering displacement meter collecting cassette with displacement meter collecting cassette information, computer 13 controls to be connected to will pass through testing machine control box 12 controlled loading power source and lower platen 17 applies the load signal of upwards active force acceptance test machine control box 12 feedback with testing machine control box 12, loading power source is hydraulic cylinder, arranges billet 21 when test at the top of the bottom of seaming chuck body 14 and high temperature resistant cushion block 18.
Compression testing machine in the concrete material high temperature of the present embodiment, combine ingenious to the heating device of concrete test and loading equipemtn, and it is aided with displacement acquisition device, define and can be used for the comprehensive test system of compression test in concrete sample high temperature, high temperature furnace is located between top board and lower platen by high temperature furnace bracing frame, on high temperature furnace is provided with, lower perforation and pilot hole, make high temperature resistant on, inside push-down head and the high temperature resistant guide rod deep enough high temperature furnace of energy, achieve intensification synchronization with what load, can concrete true environment in simulated fire high temperature truly, displacement acquisition device adopts two displacement meters and two guide rod structures, gather the change in displacement data at the upper and lower two ends of concrete sample respectively, solve the problem that between collection value and true measurement, error is big very well, carry out concrete material by compression testing machine in this concrete material high temperature and test the result of the test the drawn compressive property actual with concrete in high temperature of fire closely, high temperature and fire resistance for studying concrete material provide guarantee. column top is provided with screw thread, crossbeam by with the threaded engagement of column realize move up and down and position, simple in construction, very easy to use. heating device also includes temperature control system and the temperature sensor being located in high temperature furnace, it is possible to design temperature automatically keep design temperature according to demand. guide rod structure is simple, the movement of high temperature resistant guide rod is converted into the movement of displacement meter probe portion dexterously so that displacement meter can be located at outside high temperature furnace, it is prevented that displacement meter is by high temperature failure or is affected by high temperature and affects certainty of measurement. promote device, the high temperature resistant cushion block in high temperature furnace is made to move forward and backward, thus reaching the purpose that 3 concrete sample high temperature can be loaded that once heats up, meet the requirement of 3 test specimens of 1 group of compression test of regulation in mechanical performance of concrete test method standard. power source includes electric machine support and the motor being located on electric machine support, electric machine support includes two the horizontally disposed leading screws being arranged on rear side of described high temperature furnace, motor drives with the screw on described leading screw and is connected, motor is mobile very convenient on leading screw, rule it is provided with, for the distance monitoring motor and catch bar moves by leading screw. computer is connected the displacement signal for gathering displacement meter collecting cassette with displacement meter collecting cassette information, and computer controls to be connected to will pass through testing machine control box controlled loading power source and lower platen applies the load signal of upwards active force acceptance test machine control box feedback with testing machine control box.
In other embodiments, unlike the embodiments above is, crossbeam can also be fixed by jackscrew, high temperature resistant push-down head and high temperature resistant seaming chuck are column integrative-structure, displacement meter is fixed on high temperature resistant seaming chuck, described guide rod structure is high temperature resistant guide rod, and the probe portion of displacement meter is directly connected to high temperature resistant guide rod, and described power source can also be conductive push rod or pneumatic cylinder.
Finally should be noted that: above example is only in order to illustrate that the technical solution of the utility model is not intended to limit; Although this utility model being described in detail with reference to preferred embodiment, those of ordinary skill in the field are it is understood that still can modify to detailed description of the invention of the present utility model or portion of techniques feature carries out equivalent replacement; Without deviating from the spirit of technical solutions of the utility model, it all should be encompassed in the middle of the technical scheme scope that this utility model is claimed.
Claims (8)
1. compression testing machine in concrete material high temperature, it is characterised in that: include for concrete sample being executed stressed loading equipemtn, for heating the heating device of concrete sample and for measuring the displacement acquisition device of concrete sample deflection;
Described loading equipemtn includes base, be fixed on this base column, be located on described column and move up and down and position along described column crossbeam, be fixed on the top board bottom crossbeam, be fixed on the high temperature resistant seaming chuck bottom top board, the lower platen being located on described base, the high temperature resistant push-down head being located on described lower platen and for described lower platen being applied the loading power source of upwards active force;
Described heating device includes high temperature furnace bracing frame, be located on this high temperature furnace bracing frame high temperature furnace and the heater being located in high temperature furnace, described high temperature furnace is between described top board and described lower platen, the top board of described high temperature furnace is arranged for described high temperature resistant seaming chuck down through the upper perforation within high temperature furnace, the base plate of described high temperature furnace arranges and upwards penetrates the lower perforation within high temperature furnace, described upper perforation and described lower perforation in the vertical direction just to setting for described high temperature resistant push-down head;
Described displacement acquisition device includes two displacement meters being located on described high temperature resistant seaming chuck, the displacement meter collecting cassette gathering two displacement meter information and two guide rod structures, the high temperature resistant guide rod of one of them guide rod structure is longer than the high temperature resistant guide rod of another guide rod structure, and the top board of described high temperature furnace is provided with the pilot hole of high temperature resistant guide rod traverse described in two confessions two.
2. compression testing machine in concrete material high temperature according to claim 1, it is characterized in that: seaming chuck bearing that described high temperature resistant seaming chuck includes being fixedly arranged on described top board and be fixedly arranged on the seaming chuck body on described seaming chuck bearing, push-down head bearing that described high temperature resistant push-down head includes being fixedly arranged on described lower platen and be fixedly arranged on the push-down head body on described push-down head bearing.
3. compression testing machine in concrete material high temperature according to claim 1, it is characterized in that: described column top is provided with screw thread, two ends on described crossbeam rotate and are provided with nut, described crossbeam is provided with the motor for driving nut rotation described in two, and described crossbeam is by realizing moving up and down and positioning with the threaded engagement of described column.
4. compression testing machine in concrete material high temperature according to claim 1, it is characterized in that: described heating device also includes temperature control system and the temperature sensor being located in described high temperature furnace, described heater is siliconit, described temperature control system is connected with described temperature sensor sampling, and described temperature control system electrically connects with described siliconit.
5. compression testing machine in concrete material high temperature according to claim 2, it is characterized in that: described guide rod structure includes being located on the bottom surface of described seaming chuck bearing and having the spring base of stage clip and the described high temperature resistant guide rod of described stage clip bottom is located at top, the direction axially outside of described spring base is provided with guide slit, the upper end of described high temperature resistant guide rod arranges horizontal pressing plate, the slip of described horizontal pressing plate is plugged in guide slit and this transverse direction pressing plate is for the probe portion top press-fit with corresponding described displacement meter, described displacement meter is located on the sidewall of described seaming chuck bearing.
6. compression testing machine in concrete material high temperature according to claim 2, it is characterized in that: also include promoting device, described promotion device includes being located on the plate inner surface of described high temperature furnace and high temperature resistant guide rail vertically disposed with fire door, it is located at the high temperature resistant cushion block on described push-down head body, slide and be inserted in the catch bar on high temperature furnace sidewall and drive the reciprocating power source of described catch bar, the bottom of described high temperature resistant cushion block is provided with the chute coordinated with described high temperature resistant slide, described catch bar slides on described high temperature resistant slide rail for promoting described high temperature resistant cushion block.
7. compression testing machine in concrete material high temperature according to claim 6, it is characterized in that: described power source includes electric machine support and the motor being located on electric machine support, described electric machine support includes two the horizontally disposed leading screws being arranged on rear side of described high temperature furnace, motor drives with the screw on described leading screw and is connected, and is provided with rule by leading screw.
8. compression testing machine in concrete material high temperature according to claim 6, it is characterized in that: also include computer, described computer is connected the displacement signal for gathering displacement meter collecting cassette with described displacement meter collecting cassette information, and described computer controls to be connected to will pass through testing machine control box controlled loading power source and described lower platen applies the load signal of upwards active force acceptance test machine control box feedback with testing machine control box.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105424498A (en) * | 2015-12-21 | 2016-03-23 | 郑州大学 | Concrete material in-high-temperature compression testing machine and in-high-temperature compression testing method |
| CN106769528A (en) * | 2016-12-20 | 2017-05-31 | 安徽理工大学 | A kind of temperature control system and its temperature control method and tensile strength test device |
| CN107631934A (en) * | 2017-10-26 | 2018-01-26 | 新疆大学 | A kind of high temperature is without confining pressure instrument |
| CN110530733A (en) * | 2019-08-28 | 2019-12-03 | 山东交通学院 | The MPC composite materials property experimental provision and method of different temperatures environment |
| CN114383929A (en) * | 2021-12-24 | 2022-04-22 | 西安建筑科技大学 | Concrete stress strain testing device |
-
2015
- 2015-12-21 CN CN201521067350.6U patent/CN205280509U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105424498A (en) * | 2015-12-21 | 2016-03-23 | 郑州大学 | Concrete material in-high-temperature compression testing machine and in-high-temperature compression testing method |
| CN106769528A (en) * | 2016-12-20 | 2017-05-31 | 安徽理工大学 | A kind of temperature control system and its temperature control method and tensile strength test device |
| CN106769528B (en) * | 2016-12-20 | 2019-03-15 | 安徽理工大学 | A kind of temperature control system and its temperature control method and tensile strength test device |
| CN107631934A (en) * | 2017-10-26 | 2018-01-26 | 新疆大学 | A kind of high temperature is without confining pressure instrument |
| CN110530733A (en) * | 2019-08-28 | 2019-12-03 | 山东交通学院 | The MPC composite materials property experimental provision and method of different temperatures environment |
| CN114383929A (en) * | 2021-12-24 | 2022-04-22 | 西安建筑科技大学 | Concrete stress strain testing device |
| CN114383929B (en) * | 2021-12-24 | 2024-04-05 | 西安建筑科技大学 | Concrete stress-strain testing device |
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