CN105424498A - Concrete material in-high-temperature compression testing machine and in-high-temperature compression testing method - Google Patents
Concrete material in-high-temperature compression testing machine and in-high-temperature compression testing method Download PDFInfo
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- CN105424498A CN105424498A CN201510959836.9A CN201510959836A CN105424498A CN 105424498 A CN105424498 A CN 105424498A CN 201510959836 A CN201510959836 A CN 201510959836A CN 105424498 A CN105424498 A CN 105424498A
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention provides a concrete material in-high-temperature compression testing machine and an in-high-temperature compression testing method. The concrete material in-high-temperature compression testing machine comprises loading equipment for applying pressure on a concrete test-piece, heating equipment for heating the concrete test-piece, and a displacement acquisition device for measuring the deformation of the concrete test-piece. According to the concrete material in-high-temperature compression testing machine, the heating equipment and the loading equipment for concrete testing are skillfully combined together, and are assisted by the displacement acquisition device, so that a comprehensive testing system capable of being used for concrete test-piece in-high-temperature compression testing is formed, synchronization of heating and loading is realized, a concrete environment in high temperature due to fire can be truly simulated, a test result obtained by performing a concrete material test through the concrete material in-high-temperature compression testing machine is very close to actual compressive property of concrete in high temperature due to fire, and a guarantee is provided for researching high temperature performance and fire resistance of a concrete material.
Description
Technical field
The present invention relates to a kind of concrete material testing machine for mechanical properties, especially a kind of testing machine for compressive strength and constitutive relation in the material at high temperature such as normal concrete, fiber concrete, regeneration concrete, high-strength concrete; Also relate to the mechanical test method of concrete material, especially the test method of compressive strength and constitutive relation in concrete high temperature.
Background technology
Concrete is the building materials that in engineering construction, purposes is the widest, consumption is maximum.In recent years, along with concrete material high-rise, towering, greatly across etc. the going deep into of particular service requirement and harsh and unforgiving environments application, new requirement is proposed to concrete material high temperature fire resistance, is badly in need of corresponding high-temperature test facility to research and develop the high temperature fire resistance of concrete material.Temperature elevation system and the loading system of existing concrete high temperature compression test equipment are separated often, 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 to be carried out after high temperature.After high temperature, concrete anti-compression performance test is put in heating device by concrete material to heat, and stops heating after reaching desired value, loads after concrete material cooling on loading equipemtn.In approximate high temperature, concrete anti-compression performance test is then after concrete temperature in heating device reaches desired value, to be put on compression testing machine by the concrete material being in the condition of high temperature immediately to load with instruments such as special high temperature-resistant pliers.Find in practical application, no matter be compression test after high temperature, or compression test in approximate high temperature, in the concrete high temperature of gained, in compression test result and high temperature of fire, the compressive property of concrete reality all has larger difference.
In order to solve above Problems existing, people are seeking a kind of desirable technical solution always.
Summary of the invention
Technician is through long research of technique, finally the reason producing the problems referred to above is found, the reason that in concrete high temperature, compression test result and the compressive property of concrete reality in high temperature of fire differ greatly is: temperature elevation system and loading system due to compression test equipment in concrete high temperature are separated often, 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 target temperature during heating, concrete sample is in temperature-fall period, outside cooling is fast, internal cooling is slow, thus produce thermal stress gradient, cause the stress damage of concrete material, and then make concrete actual compressive property in obtained experimental result and high temperature of fire produce difference.For concrete anti-compression performance test after high temperature, during loading, concrete temperature is down to normal temperature, and thermal stress damage 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 environment temperature during owing to loading is far below the temperature in heating device, the thermal stress gradient of concrete sample is comparatively large, and thermal stress damage is very important equally.
In the process of research and development, technician runs into another technical matters, and the displacement meter namely measuring concrete deformation amount is put into heating device and can be burned, and replaces the deflection of concrete sample to there is very large error if be similar to the displacement of high temperature resistant pressure head.Through the unremitting tackling key problem of technician, have found the reason causing above-mentioned technical matters: namely in hot environment, high temperature resistant pressure head and cushion block all there will be distortion, and compared with the distortion of concrete sample, the deflection of high temperature resistant pressure head and cushion block is very important.
In addition, according to the existing relevant test methods standards and norms of China, concrete material performance (such as, compressive strength) be determine according to the test findings of lower 3 concrete samples of the same terms, therefore, the problem that 3 identical concrete samples heat up and load under same high temperature environment must be solved.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is: compression testing machine in concrete material high temperature, comprises for executing stressed loading equipemtn to concrete sample, for heating the heating device of concrete sample and the displacement acquisition device for measuring concrete sample deflection;
Described loading equipemtn comprises base, the column be fixed on this base, be located on described column and move up and down along described column and the crossbeam of locating, be fixed on top board bottom crossbeam, be fixed on the high temperature resistant seaming chuck bottom top board, the lower platen be located on described base, be located at the high temperature resistant push-down head on described lower platen and the loading power source for applying upwards acting force to described lower platen;
The heater that described heating device comprises high temperature furnace bracing frame, is located at the high temperature furnace on this high temperature furnace bracing frame and is 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 arranges the upper perforation penetrating high temperature furnace inside for described high temperature resistant seaming chuck downwards, the base plate of described high temperature furnace arranges the lower perforation upwards penetrating high temperature furnace inside for described high temperature resistant push-down head, and described upper perforation and described lower perforation in the vertical direction are just to setting;
Described displacement acquisition device comprises two displacement meters be 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 another guide rod structure is longer than by the high temperature resistant guide rod of one of them guide rod structure, and the top board of described high temperature furnace is provided with the pilot hole that described in two confessions two, high temperature resistant guide rod passes.
Preferably, described high temperature resistant seaming chuck comprises the seaming chuck bearing be fixedly arranged on described top board and the seaming chuck body be fixedly arranged on described seaming chuck bearing, and described high temperature resistant push-down head comprises the push-down head bearing be fixedly arranged on described lower platen and the push-down head body be fixedly arranged on described push-down head bearing.
Preferably, described column top is provided with screw thread, and the two ends on described crossbeam are rotated 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 locating with the threaded engagement of described column.
Preferably, described heating device also comprises temperature control system and is located at the temperature sensor in described high temperature furnace, and described heater is globar, and described temperature control system is connected with described temperature sensor sampling, and described temperature control system is electrically connected with described Elema.
Preferably, described guide rod structure comprise be located at described seaming chuck bearing bottom surface on and there is the described high temperature resistant guide rod that described stage clip bottom is located at the spring base of stage clip and top, the outside of described spring base is in axial direction provided with guide slit, the upper end of described high temperature resistant guide rod arranges horizontal pressing plate, described horizontal pressing plate slide be plugged in guide slit and this horizontal pressing plate 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.
Preferably, also comprise thrust unit, described thrust unit comprise be located at described high temperature furnace plate inner surface on and with the vertically disposed high temperature resistant guide rail of fire door, the high temperature resistant cushion block be located on described push-down head body, slide the catch bar that is inserted 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, and described catch bar slides on described high temperature resistant slide rail for promoting described high temperature resistant cushion block.
Preferably, described power source comprises electric machine support and is located at the motor on electric machine support, described electric machine support comprises and is arranged at the horizontally disposed leading screw of on rear side of described high temperature furnace two, and motor drives with the screw on described leading screw and is connected, and leading screw is other is provided with rule.
Preferably, also comprise computing machine, described computing machine is connected the displacement signal for gathering displacement meter collecting cassette with described displacement meter collecting cassette information, and described computing machine and testing machine control box control linkage are to apply upwards acting force by testing machine control box controlled loading power source to described lower platen and the load signal that feeds back of acceptance test machine control enclosure.
Utilize compression testing machine in concrete high temperature concrete to be carried out to the method for compression test in high temperature, comprise the steps:
1. test 3 concrete samples used are put on the high temperature resistant cushion block in high temperature furnace, steel backing plate are located on upper and lower two faces of concrete sample;
2. fire door is opened, the high temperature resistant cushion block 3 being placed with concrete sample along the high temperature resistant guide rail in high temperature furnace shifts high temperature furnace body of heater the inside onto, i.e. position shown in Fig. 2, now outmost 1st concrete sample is just positioned at the loading position that directly can load and carry out testing;
3. close high temperature furnace fire door, set temperature Protonation constant on temperature control system, i.e. programming rate and constant temperature time, and start heating;
4., after the stove inner concrete test specimen target temperature that reaches regulation and constant temperature time, start-up loading equipment, makes lower platen move up, stop after push-down head body jack-up is high temperature resistant cushion block, start crossbeam, top board is moved down, stops when seaming chuck body contacts with the billet on concrete sample;
5. adjust the position of displacement meter and high temperature resistant guide rod, make two high temperature resistant guide rods withstand the billet at concrete sample two ends respectively, two displacement meters withstand the horizontal pressing plate of two high temperature resistant guide rod upper ends respectively simultaneously;
6. pressure-loaded system is set on computers and starts to load; Now lower platen constantly can move up according to the loading velocity of setting, and transfer the load on concrete sample by push-down head bearing, push-down head body, high temperature resistant cushion block and billet successively, it is to be noted, this cognition of seaming chuck produces certain distortion with the increase of load, and concrete sample upper end also has movement upwards; Therefore, two displacement meters need be set up and measure the displacement accurately could measured the upper and lower end of concrete sample and produce respectively;
7., after the 1st concrete sample loads and terminate, test figure is stored; Then move down lower platen, high temperature resistant cushion block falls back on guide rail, and push-down head body and high temperature resistant cushion block disengage rear stop mobile; Then move up crossbeam, and the billet at high temperature resistant guide rod and concrete sample two ends disengages rear stopping and moving;
8. start the power source of thrust unit, high temperature resistant cushion block moves along guide rail to fire door direction under the effect of catch bar, moves to after loading position stop moving until the 2nd concrete sample;
9. repeat step 4. ~ 6., the 2nd concrete sample is loaded; Loading terminate rear repetition step 7. ~ 8., the 3rd concrete sample is moved to loading position, again repeat step 4. ~ 6., the 3rd concrete sample is loaded;
10. after 3 whole loadeds of concrete sample, lower platen falls back to the end, then closes loading equipemtn and high temperature furnace, and opens fire door, and take out in stove after concrete sample cooling, test completes.
Hinge structure of the present invention has substantive distinguishing features and progress, specifically, compression testing machine in concrete material high temperature, by the heating device of concrete test with loading equipemtn is ingenious combines, and be aided with displacement acquisition device, define the comprehensive test system that can be used for 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, push-down head and the deep enough high temperature furnace inside of high temperature resistant guide rod energy, achieve heat up with loading synchronous, 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 large well, carry out concrete material compressive property by compression testing machine in this concrete material high temperature and test the compressive property of concrete reality in the test findings and high temperature of fire drawn closely, for the high temperature and fire resistance of studying concrete material provide guarantee.
Further, column top is provided with screw thread, and crossbeam is by realizing moving up and down and locating with the threaded engagement of column, and structure is simple, very easy to use.
Further, heating device also comprises temperature control system and is located at the temperature sensor in high temperature furnace, also automatically can keep design temperature by design temperature according to demand.
Further, guide rod structure is simple, dexterously the movement of high temperature resistant guide rod is converted into the movement of displacement meter probe portion, displacement meter can be located at outside high temperature furnace, prevent displacement meter be subject to high temperature failure or be subject to temperatures involved and affect measuring accuracy.
Further, thrust unit makes the high temperature resistant cushion block in high temperature furnace move forward and backward, thus reach and once heat up successively to the object that 3 concrete sample high temperature load, meet the requirement of 1 group of compression test, 3 test specimens specified in mechanical performance of concrete test method standard.。
Further, power source comprises electric machine support and is located at the motor on electric machine support, electric machine support comprises and is arranged at the horizontally disposed leading screw of on rear side of described high temperature furnace two, motor drives with the screw on described leading screw and is connected, motor is mobile very convenient on leading screw, leading screw is other is provided with rule, for monitoring the distance of motor and catch bar movement.
Further, computing machine is connected the displacement signal for gathering displacement meter collecting cassette with displacement meter collecting cassette information, and computing machine and testing machine control box control linkage are to apply upwards acting force by testing machine control box controlled loading power source to lower platen and the load signal that feeds back of acceptance test machine control enclosure.
Of the present inventionly compression testing machine in coagulation material soil high temperature is utilized concrete to be carried out to the method for compression test in high temperature, compression testing machine in concrete high temperature can be utilized, simply complete compression test in concrete high temperature efficiently, for the high temperature and fire resistance studying concrete material provides guarantee.
Accompanying drawing explanation
Fig. 1 is the main TV structure schematic diagram in the embodiment of the present invention.
Fig. 2 is the side-looking structural representation in the embodiment of the present invention.
Fig. 3 is the enlarged drawing at Figure 1A place.
Embodiment
Below by embodiment, technical scheme of the present invention is described in further detail.
Compression testing machine in concrete material high temperature, as shown in Figures 1 to 3, comprise for concrete sample is executed stressed loading equipemtn, for heat concrete sample heating device, for measure concrete sample deflection displacement acquisition device and for promoting the thrust unit that concrete sample moves to fire door direction, loading equipemtn comprises base 6, be fixed on the column 7 on this base 6, to be located on column 7 and to move up and down and the crossbeam 9 of locating along column 7, be fixed on the top board 10 bottom crossbeam, be fixed on the high temperature resistant seaming chuck bottom top board, be located at the lower platen 11 on base 6, be located at the high temperature resistant push-down head on lower platen 11 and the loading power source for applying upwards acting force to lower platen 11, 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 are rotated 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 locating with the threaded engagement of column 7.High temperature resistant seaming chuck comprises the seaming chuck bearing 16 be fixedly arranged on top board 10 and the seaming chuck body 14 be fixedly arranged on seaming chuck bearing 16, high temperature resistant push-down head comprises the push-down head bearing 17 be fixedly arranged on lower platen 11 and the push-down head body 15 be 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 strength, high temperature resistant and high temperature creep-resisting; The temperature sensor 4 that heating device comprises high temperature furnace bracing frame 2, is located at the high temperature furnace 1 on this high temperature furnace bracing frame 2, the heater be located in high temperature furnace, temperature control system 5 and is located in high temperature furnace, heater is globar, U-shaped globar 3 is specially in the present embodiment, temperature control system 5 is sampled with temperature sensor 4 and is connected, temperature control system 5 is electrically connected with U-shaped globar, temperature sensor 4 is corundum thermopair, 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 for when heating and test.High temperature furnace 1 is between top board 10 and lower platen 17, the top board of high temperature furnace arranges the upper perforation penetrating high temperature furnace inside for high temperature resistant seaming chuck downwards, the base plate of high temperature furnace arranges the lower perforation upwards penetrating high temperature furnace inside for high temperature resistant push-down head, and upper perforation and lower perforation in the vertical direction are just to setting, displacement acquisition device comprises two displacement meters 22 be located on high temperature resistant seaming chuck, gather displacement meter collecting cassette 23 and two guide rod structures of two displacement meter information, guide rod structure comprise be located at seaming chuck bearing 16 bottom surface on and there is the high temperature resistant guide rod 24 that stage clip bottom is located at the spring base 30 of stage clip 29 and top, the outside of spring base 30 is in axial direction provided with guide slit, the upper end of high temperature resistant guide rod arranges horizontal pressing plate 31, horizontal pressing plate 31 slide be plugged in guide slit and this horizontal pressing plate 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 24 of another guide rod structure is longer than by the high temperature resistant guide rod of one of them guide rod structure, displacement meter 22 is grating displacement meter, the top board of high temperature furnace 1 is provided with the pilot hole that two confessions, two high temperature resistant guide rods pass.Thrust unit comprise be located at high temperature furnace 1 plate inner surface on and high temperature resistant guide rail 19 vertically disposed with fire door 28, be located at the high temperature resistant cushion block 18 on push-down head body 15, slide the catch bar 25 and the reciprocating power source of driving catch bar 25 that are inserted on high temperature furnace sidewall, the bottom of high temperature resistant cushion block 18 is provided with the chute be slidably matched with high temperature resistant guide rail 19, catch bar slides on high temperature resistant slide rail 19 for promoting high temperature resistant cushion block 18, power source comprises electric machine support 27 and is located at the motor 26 on electric machine support 27, electric machine support comprises and is arranged at the horizontally disposed leading screw of on rear side of high temperature furnace two, motor drives with the screw on described leading screw and is connected, leading screw is other is provided with rule.Computing machine is connected the displacement signal for gathering displacement meter collecting cassette with displacement meter collecting cassette information, computing machine 13 applies upwards acting force with testing machine control box 12 control linkage so that by testing machine control box 12 controlled loading power source to lower platen 17 and the load signal that feeds back of acceptance test machine control enclosure 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, by the heating device of concrete test with loading equipemtn is ingenious combines, and be aided with displacement acquisition device, define the comprehensive test system that can be used for 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, push-down head and the deep enough high temperature furnace inside of high temperature resistant guide rod energy, achieve heat up with loading synchronous, 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 large very well, carry out concrete material by compression testing machine in this concrete material high temperature and test the compressive property of concrete reality in the test findings and high temperature of fire drawn closely, for the high temperature and fire resistance of studying concrete material provide guarantee.Column top is provided with screw thread, and crossbeam is by realizing moving up and down and locating with the threaded engagement of column, and structure is simple, very easy to use.Heating device also comprises temperature control system and is located at the temperature sensor in high temperature furnace, also automatically can keep design temperature by design temperature according to demand.Guide rod structure is simple, dexterously the movement of high temperature resistant guide rod is converted into the movement of displacement meter probe portion, displacement meter can be located at outside high temperature furnace, prevent displacement meter be subject to high temperature failure or be subject to temperatures involved and affect measuring accuracy.Thrust unit, high temperature resistant cushion block in high temperature furnace can be moved forward and backward, thus reach the object once heating up and can load 3 concrete sample high temperature, meet the requirement of 1 group of compression test, 3 test specimens specified in mechanical performance of concrete test method standard.Power source comprises electric machine support and is located at the motor on electric machine support, electric machine support comprises and is arranged at the horizontally disposed leading screw of on rear side of described high temperature furnace two, motor drives with the screw on described leading screw and is connected, motor is mobile very convenient on leading screw, leading screw is other is provided with rule, for monitoring the distance of motor and catch bar movement.Computing machine is connected the displacement signal for gathering displacement meter collecting cassette with displacement meter collecting cassette information, and computing machine and testing machine control box control linkage are to apply upwards acting force by testing machine control box controlled loading power source to lower platen and the load signal that feeds back of acceptance test machine control enclosure.
In other embodiments, with above-described embodiment unlike, 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 directly connects high temperature resistant guide rod, and described power source can also be conductive push rod or pneumatic cylinder.
Utilize compression testing machine in concrete high temperature concrete to be carried out to the embodiment of the method for compression test in high temperature, comprise the steps:
1. test 3 concrete samples used are put on the high temperature resistant cushion block in high temperature furnace, steel backing plate are located on upper and lower two faces of concrete sample;
2. fire door is opened, the high temperature resistant cushion block 3 being placed with concrete sample along the high temperature resistant guide rail in high temperature furnace shifts high temperature furnace body of heater the inside onto, i.e. position shown in Fig. 2, now outmost 1st concrete sample is just positioned at the loading position that directly can load and carry out testing;
3. close high temperature furnace fire door, set temperature Protonation constant on temperature control system, i.e. programming rate and constant temperature time, and start heating;
4., after the stove inner concrete test specimen target temperature that reaches regulation and constant temperature time, start-up loading equipment, makes lower platen move up, stop after push-down head body jack-up is high temperature resistant cushion block, start crossbeam, top board is moved down, stops when seaming chuck body contacts with the billet on concrete sample;
5. adjust the position of displacement meter and high temperature resistant guide rod, make two high temperature resistant guide rods withstand the billet at concrete sample two ends respectively, two displacement meters withstand the horizontal pressing plate of two high temperature resistant guide rod upper ends respectively simultaneously;
6. pressure-loaded system is set on computers and starts to load; Now lower platen constantly can move up according to the loading velocity of setting, and transfer the load on concrete sample by push-down head bearing, push-down head body, high temperature resistant cushion block and billet successively, it is to be noted, this cognition of seaming chuck produces certain distortion with the increase of load, and concrete sample upper end also has movement upwards; Therefore, two displacement meters need be set up and measure the displacement accurately could measured the upper and lower end of concrete sample and produce respectively;
7., after the 1st concrete sample loads and terminate, test figure is stored; Then move down lower platen, high temperature resistant cushion block falls back on guide rail, and push-down head body and high temperature resistant cushion block disengage rear stop mobile; Then move up crossbeam, and the billet at high temperature resistant guide rod and concrete sample two ends disengages rear stopping and moving;
8. start the power source of thrust unit, high temperature resistant cushion block moves along guide rail to fire door direction under the effect of catch bar, moves to after loading position stop moving until the 2nd concrete sample;
9. repeat step 4. ~ 6., the 2nd concrete sample is loaded; Loading terminate rear repetition step 7. ~ 8., the 3rd concrete sample is moved to loading position, again repeat step 4. ~ 6., the 3rd concrete sample is loaded;
10. after 3 whole loadeds of concrete sample, lower platen falls back to the end, then closes loading equipemtn and high temperature furnace, and opens fire door, and take out in stove after concrete sample cooling, test completes.
The present embodiment utilizes compression testing machine in concrete high temperature concrete to be carried out to the method for compression test in high temperature, compression testing machine in concrete high temperature can be utilized, simply complete compression test in concrete high temperature efficiently, for the high temperature and fire resistance studying concrete material provides guarantee.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; Although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or carry out equivalent replacement to portion of techniques feature; And not departing from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope of request of the present invention protection.
Claims (9)
1. compression testing machine in concrete material high temperature, is characterized in that: comprise for executing stressed loading equipemtn to concrete sample, for heating the heating device of concrete sample and the displacement acquisition device for measuring concrete sample deflection;
Described loading equipemtn comprises base, the column be fixed on this base, be located on described column and move up and down along described column and the crossbeam of locating, be fixed on top board bottom crossbeam, be fixed on the high temperature resistant seaming chuck bottom top board, the lower platen be located on described base, be located at the high temperature resistant push-down head on described lower platen and the loading power source for applying upwards acting force to described lower platen;
The heater that described heating device comprises high temperature furnace bracing frame, is located at the high temperature furnace on this high temperature furnace bracing frame and is 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 arranges the upper perforation penetrating high temperature furnace inside for described high temperature resistant seaming chuck downwards, the base plate of described high temperature furnace arranges the lower perforation upwards penetrating high temperature furnace inside for described high temperature resistant push-down head, and described upper perforation and described lower perforation in the vertical direction are just to setting;
Described displacement acquisition device comprises two displacement meters be 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 another guide rod structure is longer than by the high temperature resistant guide rod of one of them guide rod structure, and the top board of described high temperature furnace is provided with the pilot hole that described in two confessions two, high temperature resistant guide rod passes.
2. compression testing machine in concrete material high temperature according to claim 1, it is characterized in that: described high temperature resistant seaming chuck comprises the seaming chuck bearing be fixedly arranged on described top board and the seaming chuck body be fixedly arranged on described seaming chuck bearing, described high temperature resistant push-down head comprises the push-down head bearing be fixedly arranged on described lower platen and the push-down head body be fixedly arranged 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 are rotated 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 locating 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 comprises temperature control system and is located at the temperature sensor in described high temperature furnace, described heater is globar, described temperature control system is connected with described temperature sensor sampling, and described temperature control system is electrically connected with described Elema.
5. compression testing machine in concrete material high temperature according to claim 2, it is characterized in that: described guide rod structure comprise be located at described seaming chuck bearing bottom surface on and there is the described high temperature resistant guide rod that described stage clip bottom is located at the spring base of stage clip and top, the outside of described spring base is in axial direction provided with guide slit, the upper end of described high temperature resistant guide rod arranges horizontal pressing plate, described horizontal pressing plate slide be plugged in guide slit and this horizontal pressing plate 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 comprise thrust unit, described thrust unit comprise be located at described high temperature furnace plate inner surface on and high temperature resistant guide rail vertically disposed with fire door, be located at the high temperature resistant cushion block on described push-down head body, slide the catch bar that is inserted 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 comprises electric machine support and is located at the motor on electric machine support, described electric machine support comprises and is arranged at the horizontally disposed leading screw of on rear side of described high temperature furnace two, motor drives with the screw on described leading screw and is connected, and leading screw is other is provided with rule.
8. compression testing machine in concrete material high temperature according to claim 6, it is characterized in that: also comprise computing machine, described computing machine is connected the displacement signal for gathering displacement meter collecting cassette with described displacement meter collecting cassette information, and described computing machine and testing machine control box control linkage are to apply upwards acting force by testing machine control box controlled loading power source to described lower platen and the load signal that feeds back of acceptance test machine control enclosure.
9. utilize compression testing machine in concrete high temperature concrete to be carried out to the method for compression test in high temperature, it is characterized in that comprising the steps:
1. test 3 concrete samples used are put on the high temperature resistant cushion block in high temperature furnace, steel backing plate are located on upper and lower two faces of concrete sample;
2. fire door is opened, the high temperature resistant cushion block 3 being placed with concrete sample along the high temperature resistant guide rail in high temperature furnace shifts high temperature furnace body of heater the inside onto, i.e. position shown in Fig. 2, now outmost 1st concrete sample is just positioned at the loading position that directly can load and carry out testing;
3. close high temperature furnace fire door, set temperature Protonation constant on temperature control system, i.e. programming rate and constant temperature time, and start heating;
4., after the stove inner concrete test specimen target temperature that reaches regulation and constant temperature time, start-up loading equipment, makes lower platen move up, stop after push-down head body jack-up is high temperature resistant cushion block, start crossbeam, top board is moved down, stops when seaming chuck body contacts with the billet on concrete sample;
5. adjust the position of displacement meter and high temperature resistant guide rod, make two high temperature resistant guide rods withstand the billet at concrete sample two ends respectively, two displacement meters withstand the horizontal pressing plate of two high temperature resistant guide rod upper ends respectively simultaneously;
6. pressure-loaded system is set on computers and starts to load; Now lower platen constantly can move up according to the loading velocity of setting, and transfer the load on concrete sample by push-down head bearing, push-down head body, high temperature resistant cushion block and billet successively, it is to be noted, this cognition of seaming chuck produces certain distortion with the increase of load, and concrete sample upper end also has movement upwards; Therefore, two displacement meters need be set up and measure the displacement accurately could measured the upper and lower end of concrete sample and produce respectively;
7., after the 1st concrete sample loads and terminate, test figure is stored; Then move down lower platen, high temperature resistant cushion block falls back on guide rail, and push-down head body and high temperature resistant cushion block disengage rear stop mobile; Then move up crossbeam, and the billet at high temperature resistant guide rod and concrete sample two ends disengages rear stopping and moving;
start the power source of thrust unit, high temperature resistant cushion block moves along guide rail to fire door direction under the effect of catch bar, moves to after loading position stop moving until the 2nd concrete sample;
repeat step
~
, the 2nd concrete sample is loaded; Loading terminates rear repetition step
~
, the 3rd concrete sample is moved to loading position, again repeats step
~
, the 3rd concrete sample is loaded;
after 3 whole loadeds of concrete sample, lower platen falls back to the end, then closes loading equipemtn and high temperature furnace, and opens fire door, and take out in stove after concrete sample cooling, test completes.
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