CN113203635A - Method for detecting concrete setting strength in low-temperature environment - Google Patents
Method for detecting concrete setting strength in low-temperature environment Download PDFInfo
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- CN113203635A CN113203635A CN202110509647.7A CN202110509647A CN113203635A CN 113203635 A CN113203635 A CN 113203635A CN 202110509647 A CN202110509647 A CN 202110509647A CN 113203635 A CN113203635 A CN 113203635A
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000007246 mechanism Effects 0.000 claims abstract description 95
- 238000001514 detection method Methods 0.000 claims abstract description 42
- 238000002474 experimental method Methods 0.000 claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 239000002826 coolant Substances 0.000 claims abstract description 7
- 238000012545 processing Methods 0.000 claims abstract description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 24
- 229910052757 nitrogen Inorganic materials 0.000 claims description 12
- 238000009833 condensation Methods 0.000 claims description 11
- 230000005494 condensation Effects 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 9
- 238000012360 testing method Methods 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 description 16
- 238000009413 insulation Methods 0.000 description 11
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
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- 230000000694 effects Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- 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
- 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
- G01N3/02—Details
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0067—Fracture or rupture
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0228—Low temperature; Cooling means
Abstract
The invention discloses a method for detecting the concrete setting strength in a low-temperature environment, which comprises the following steps of S1: preparing a concrete sample, namely grinding the concrete sample to prepare an experimental block meeting the requirement, so that subsequent clamping detection is facilitated; s2: placing the concrete strength detection device in place, placing the concrete strength detection device above a concrete sample, and aligning the clamping mechanism to the experiment block; s3: cooling the concrete sample, introducing a cooling medium into the concrete strength detection device, and cooling the concrete; s4: stretching the experimental block, and starting a concrete strength detection device to perform tensile fracture detection on the experimental block when the concrete sample reaches a certain temperature; s5: and (4) data processing, wherein when the experimental block is broken, the data of the tension sensor on the concrete strength detection device is recorded, and the tension value is converted into the strength value of the concrete. The method can realize the purpose of detecting the strength of the concrete in a low-temperature environment.
Description
Technical Field
The invention belongs to the technical field of concrete strength detection methods, and particularly relates to a method for detecting concrete setting strength in a low-temperature environment.
Background
After the engineering construction is finished, the coagulation strength needs to be detected when the completion acceptance is carried out, so that whether the proper amount of engineering meets the relevant requirements or not is judged. The strength of concrete has a large impact on the engineering quality. In the construction of the chemical field, chemical raw materials are contained in industrial plants, and the temperature is sharply reduced after the chemical raw materials are leaked. At this time, the concrete is in a low-temperature environment, and it is of great significance to a factory that the concrete maintains high strength in the low-temperature environment, and further expansion of accidents can be avoided. Therefore, the method has prospective significance in detecting the strength of the concrete in a low-temperature environment.
In the actual concrete detection, no method specially used for detecting the concrete strength in the low-temperature environment exists.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for detecting the concrete setting strength in a low-temperature environment, and solves the problems in the background art.
The invention provides the following technical scheme:
a method for detecting the concrete setting strength in a low-temperature environment comprises the following steps:
s1: preparing a concrete sample, namely grinding the concrete sample to prepare an experimental block meeting the requirement, so that subsequent clamping detection is facilitated;
s2: placing the concrete strength detection device in place, placing the concrete strength detection device above a concrete sample, and aligning the clamping mechanism to the experiment block;
s3: cooling the concrete sample, introducing a cooling medium into the concrete strength detection device, and cooling the concrete;
s4: stretching the experimental block, and starting a concrete strength detection device to perform tensile fracture detection on the experimental block when the concrete sample reaches a certain temperature;
s5: and (4) data processing, wherein when the experimental block is broken, the data of the tension sensor on the concrete strength detection device is recorded, and the tension value is converted into the strength value of the concrete.
Preferably, in step S1, the experiment block is provided with a groove on the lower side, so that the clamping mechanism and the experiment block can be conveniently positioned, and the clamping mechanism acts on the groove, so that the experiment block can be conveniently clamped and stretched for detection.
Preferably, in step S3, a temperature measuring device is provided in the concrete sample detection device, and the temperature of the concrete sample can be known in time by the temperature measuring device.
Preferably, in step S5, when the test block is separated from the concrete sample by breaking, the value of the tension sensor is recorded.
Preferably, in step S3, when the concrete sample is cooled, the cooling medium used is liquid nitrogen, and the concrete strength detection device is connected to a condensation tank in which the liquid nitrogen is contained.
Preferably, in step S4, the power unit of the concrete strength detecting device is an electric motor or a hydraulic motor.
Preferably, in step S5, the controller is connected to the tension sensor, and the display is connected to the controller for displaying the tension value of the tension sensor.
A concrete setting intensity detection device adopted by a concrete setting intensity detection method in a low-temperature environment comprises: a base; a support piece is arranged on the upper side of the base; a rotating mechanism is arranged in the supporting piece; the rotating mechanism is connected with the transmission structure; the transmission mechanism is connected with the power mechanism; a lifting mechanism is arranged in the rotating mechanism; the lifting mechanism penetrates through the supporting piece and the base; the lower end of the lifting mechanism is provided with a square plate; the square plate is provided with a clamping mechanism; a tension sensor is arranged on the lifting mechanism; the tension sensor is electrically connected with the controller; the base is provided with a connecting pipe; the connecting pipe is communicated with the inside of the base; and a condensing tank is arranged at the other end of the connecting pipe.
Preferably, the lifting mechanism comprises a threaded rod and a circular tube; the lower end of the threaded rod is inserted into the round pipe; a limiting plate is arranged at the lower end of the threaded rod; the limiting plate is positioned on the inner side of the circular tube; the lower end of the circular tube is provided with a baffle.
Preferably, a support plate is arranged in the round pipe; a spring is arranged between the limiting plate and the supporting plate; one end of the spring is connected with the limiting plate, and the other end of the spring is connected with the supporting plate.
Preferably, the cross section of the rotating mechanism is a convex knot; the rotating mechanism comprises a limiting block and a gear; the limiting block and the gear are coaxially arranged; and an inner gear ring is arranged at the central position of the gear.
Preferably, the transmission structure is a gearbox, an output shaft of the gearbox is provided with a gear, the gear is meshed with the rotating mechanism, and an output shaft of the power mechanism is connected with an input shaft of the gearbox.
Preferably, the transmission structure is a gear structure, and the gear structure is meshed with the rotating mechanism.
Preferably, the power mechanism is a motor or a hydraulic motor; the output end of the power mechanism is connected with the output end of the transmission mechanism.
Preferably, the clamping mechanism comprises a first connecting rod, a clamping arm, a second connecting rod and a connecting block; the number of the first connecting rods, the number of the clamping arms, the number of the second connecting rods and the number of the connecting blocks are two; the two first connecting rods are hinged with the square plate; one end of the second connecting rod is connected with the first connecting rod, and the other end of the second connecting rod is connected with the connecting block.
Preferably, the lower end of the connecting block is provided with an ejector rod; an elastic piece is arranged between the top rods.
Preferably, the condensation tank contains liquid nitrogen; and a valve is arranged at the air outlet of the condensing tank and is connected with the connecting pipe through a pipeline.
Preferably, the outer surface of the base is provided with a cold insulation layer.
Preferably, a temperature measuring device is arranged in the base; the temperature measuring device is used for measuring the temperature of the concrete.
Preferably, in the concrete measuring process, in order to sufficiently cool the concrete, the volume V inside the base, the thickness D of the base plate, and the thickness D of the cold insulation layer satisfy the following relationship:
d =α·V/D+M；
wherein D, d has the unit of cm; alpha is a correlation coefficient, the value range is 0.005-0.025, and the unit of V is cm3(ii) a M is a compensation parameter and takes a value of 1-3.
Preferably, in order to ensure the strength of the clamping mechanism, a second cold insulation layer is arranged on the outer surface of the clamping mechanism, and the hardness P1 of the steel used by the clamping mechanism is 40-55 HRC; the hardness P2 of the steel used for the base is 30-45 HRC; the P1 & P2 is not less than 1500 HRC and not more than 2300 HRC.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the method for detecting the concrete condensation strength in the low-temperature environment, the condensation tank is arranged, and the condensation gas is contained in the condensation tank, so that the low-temperature environment can be provided, the strength of the concrete can be detected in the low-temperature environment, and the requirement for detecting the concrete strength in actual operation can be met.
(2) According to the method for detecting the concrete setting strength in the low-temperature environment, the temperature of the detection sample can be measured by arranging the temperature measuring device, the temperature of the measurement sample can be conveniently mastered in real time, the experiment efficiency is improved, and the experiment effect is improved.
(3) According to the method for detecting the concrete setting strength in the low-temperature environment, the clamping mechanism is arranged, so that the clamping mechanism can be rapidly fixed on the sample, the fixing process is simple, the time consumption is short, and the experiment efficiency is improved.
(4) According to the method for detecting the concrete setting strength in the low-temperature environment, disclosed by the invention, the relation among the volume V of the inner side of the base, the thickness D of the base plate and the thickness D of the cold insulation layer is limited, so that the concrete can be sufficiently cooled in the concrete measuring process, and the concrete strength can be detected in the low-temperature environment.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a flow chart of the present invention.
Fig. 2 is a schematic view of the overall structure of the present invention.
Fig. 3 is a sectional view of a portion of the structure of fig. 1 in accordance with the present invention.
Fig. 4 is a schematic view of the lifting mechanism of the present invention.
Fig. 5 is a schematic view of the turning mechanism of the present invention.
Fig. 6 is a schematic view of the clamping mechanism of the present invention.
Fig. 7 is a schematic illustration of the stem lifter of the present invention.
FIG. 8 is a schematic view of a concrete sample according to the present invention.
In the figure: 1. a base; 2. a support member; 3. a controller; 4. a rotating mechanism; 5. a lifting mechanism; 6. a power mechanism; 7. a transmission structure; 8. a tension sensor; 9. a connecting pipe; 10. a square plate; 11. a clamping mechanism; 12. a condensing tank; 13. a valve; 14. a temperature measuring device; 15. concrete sample, 16, experimental block; 401. a gear; 402. an inner gear ring; 403. a limiting block; 501. a threaded rod; 502. a limiting plate; 503. a spring; 504. a support plate; 505. a circular tube; 506. a baffle plate; 1101. a first link; 1102. a clamp arm; 1103. a top rod; 1104. a second link; 1105. connecting blocks; 1106. an elastic member.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described in detail and completely with reference to the accompanying drawings. It is to be understood that the described embodiments are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The first embodiment is as follows:
referring to fig. 1, a method for detecting concrete setting strength in a low-temperature environment includes the following steps:
s1: preparing a concrete sample, namely grinding the concrete sample to prepare an experimental block meeting the requirement, so that subsequent clamping detection is facilitated;
s2: placing the concrete strength detection device in place, placing the concrete strength detection device above a concrete sample, and aligning the clamping mechanism to the experiment block;
s3: cooling the concrete sample, introducing a cooling medium into the concrete strength detection device, and cooling the concrete;
s4: stretching the experimental block, and starting a concrete strength detection device to perform tensile fracture detection on the experimental block when the concrete sample reaches a certain temperature;
s5: and (4) data processing, wherein when the experimental block is broken, the data of the tension sensor on the concrete strength detection device is recorded, and the tension value is converted into the strength value of the concrete.
In step S1, a groove is formed in the lower side of the experiment block, so that the clamping mechanism and the experiment block can be conveniently positioned, and the clamping mechanism acts in the groove, so that the experiment block can be conveniently clamped and stretched for detection.
In step S3, a temperature measuring device is provided in the concrete sample detection device, and the temperature of the concrete sample can be known in time by the temperature measuring device.
In step S5, when the test block and the concrete sample are broken and separated, the value of the tension sensor is recorded.
In step S3, when the concrete sample is cooled, the cooling medium used is liquid nitrogen, and the concrete strength detection device is connected to a condensation tank in which the liquid nitrogen is contained.
In step S4, the power unit of the concrete strength detection device is an electric motor or a hydraulic motor.
In step S5, the tension sensor is connected to a controller, and the controller is connected to a display for displaying the tension value of the tension sensor.
Example two:
referring to fig. 2-8, a concrete setting strength detecting device includes: a base 1; a rib plate is arranged on the outer side surface of the base 1, the strength of the base 1 is increased by arranging the rib plate, and a support part 2 is arranged on the upper side of the base 1; a rotating mechanism 4 is arranged in the support piece 2; the rotating mechanism 4 is connected with the transmission structure 7; the transmission mechanism 7 is connected with the power mechanism 6, and the power mechanism 6 drives the transmission mechanism 7 to rotate; a lifting mechanism 5 is arranged in the rotating mechanism 4; the lifting mechanism 5 penetrates through the support part 2 and the base 1, and when the rotating mechanism 4 rotates, the lifting mechanism 5 can move up and down; the lower end of the lifting mechanism 5 is provided with a square plate 10; the square plate 10 is provided with a clamping mechanism 11, and the clamping mechanism 11 is used for clamping a concrete sample 15; a tension sensor 8 is arranged on the lifting mechanism 5; the tension sensor 8 is electrically connected with the controller 3, the controller 3 is connected with the signal transmitter, the signal transmitter is connected with the signal receiver through a wireless transmission system, the signal receiver is connected with a display, the tension force applied to the tension sensor can be known timely through the display, and the tension sensor 8 is used for measuring the tension force applied to the lifting mechanism 5 when the concrete sample 15 is damaged; the base 1 is provided with a connecting pipe 9; the connecting pipe 9 is communicated with the inside of the base 1; the other end of the connecting pipe 9 is provided with a condensing tank 12, liquid nitrogen is contained in the condensing tank 12, and the purpose of cooling the concrete sample 15 is realized by introducing nitrogen into the inner cavity of the base 1.
The lifting mechanism 5 comprises a threaded rod 501 and a circular tube 505; the lower end of the threaded rod 501 is inserted into the circular tube 505; a limiting plate 502 is arranged at the lower end of the threaded rod 501; the limiting plate 502 is positioned at the inner side of the circular tube 505; the lower end of the circular tube 505 is provided with a baffle 506. A supporting plate 504 is arranged in the circular tube 505; a spring 503 is arranged between the limiting plate 502 and the supporting plate 504; one end of the spring 503 is connected with the limiting plate 502, and the other end is connected with the supporting plate 504.
The cross section of the rotating mechanism 4 is a convex knot; the rotating mechanism 4 comprises a limiting block 403 and a gear 401; the limiting block 403 and the gear 401 are coaxially arranged; an inner gear ring 402 is arranged at the central position of the gear 401. The limiting block 403 is arranged on the inner side of the upper surface of the support 2; the turning mechanism 4 is able to turn on the support 2.
The transmission structure 7 is a gearbox, an output shaft of the gearbox is provided with a gear, the gear is meshed with the rotating mechanism 4, and an output shaft of the power mechanism 6 is connected with an input shaft of the gearbox.
The power mechanism 6 is a motor or a hydraulic motor; the output end of the power mechanism 6 is connected with the output end of the transmission mechanism 7.
The clamping mechanism 11 comprises a first link 1101, a clamping arm 1102, a second link 1104 and a connecting block 1105; the number of the first connecting rods 1101, the clamping arms 1102, the second connecting rods 1104 and the connecting blocks 1105 is two; the two first connecting rods 1101 are hinged with the square plate 10; the second link 1104 has one end connected to the first link 1101 and the other end connected to the connection block 1105. A mandril 1103 is arranged at the lower end of the connecting block 1105; an elastic member 1106 is arranged between the push rods 1103. A second spring is arranged between the two first links 1101, when the top bar 1103 contacts with the top of the concrete sample 15, the lifting mechanism 5 moves downwards, the two clamping arms 1102 are unfolded, when the lifting mechanism 5 moves downwards for a certain distance, the two second links 1104 are located at the other side of the initial position, at the same time, under the action of the second spring, the two clamping arms 1102 clamp the experimental block 16 on the concrete sample 15, and then the lifting mechanism 15 moves upwards.
And a valve 13 is arranged at the air outlet of the condensing tank 12 and is connected with the connecting pipe 9 through a pipeline. The outer surface of the base 1 is provided with a cold insulation layer, the cold insulation layer is arranged to effectively reduce heat exchange between the inner side and the outer side of the base 1, and the effect of cooling the concrete sample 15 is improved. A temperature measuring device 14 is arranged in the base 1; the temperature measuring device is used for measuring the temperature of the concrete. The temperature measuring device 14 is an infrared temperature measuring instrument. The temperature measuring device 14 is connected with the controller 3; the value measured by the temperature measuring device 14 is displayed on a display.
In order to ensure the strength of the clamping mechanism, a second cold insulation layer is arranged on the outer surface of the clamping mechanism, and the hardness P1 of steel used by the clamping mechanism is 40-55 HRC; the hardness P2 of the steel used for the base is 30-45 HRC; the P1 & P2 is not less than 1500 HRC and not more than 2300 HRC. When P1 & P2 is less than 1500 HRC, the strength of the device is insufficient, and the device is easily damaged, and when P1 & P2 is more than 2300HRC, the device manufacturing cost is increased, and the waste of raw materials is caused.
Example two:
in contrast to the first embodiment, as shown in fig. 2 to 8, a concrete setting strength detecting apparatus includes: a base 1; a rib plate is arranged on the outer side surface of the base 1, the strength of the base 1 is increased by arranging the rib plate, and a support part 2 is arranged on the upper side of the base 1; a rotating mechanism 4 is arranged in the support piece 2; the rotating mechanism 4 is connected with the transmission structure 7; the transmission mechanism 7 is connected with the power mechanism 6, and the power mechanism 6 drives the transmission mechanism 7 to rotate; a lifting mechanism 5 is arranged in the rotating mechanism 4; the lifting mechanism 5 penetrates through the support part 2 and the base 1, and when the rotating mechanism 4 rotates, the lifting mechanism 5 can move up and down; the lower end of the lifting mechanism 5 is provided with a square plate 10; the square plate 10 is provided with a clamping mechanism 11, and the clamping mechanism 11 is used for clamping a concrete sample 15; a tension sensor 8 is arranged on the lifting mechanism 5; the tension sensor 8 is electrically connected with the controller 3, and the tension sensor 8 is used for measuring the tension borne by the lifting mechanism 5 when the concrete sample 15 is damaged; the base 1 is provided with a connecting pipe 9; the connecting pipe 9 is communicated with the inside of the base 1; the other end of the connecting pipe 9 is provided with a condensing tank 12, liquid nitrogen is contained in the condensing tank 12, and the purpose of cooling the concrete sample 15 is realized by introducing nitrogen into the inner cavity of the base 1.
The transmission structure 7 is a gear structure, and the gear structure is meshed with the rotating mechanism 4.
Example three:
the difference from the first embodiment is that, in the concrete measuring process, in order to sufficiently cool the concrete, the volume V inside the base, the thickness D of the base plate, and the thickness D of the cold insulation layer satisfy the following relationship:
d =α·V/D+M；
wherein D, d has the unit of cm; alpha is a correlation coefficient, the value range is 0.005-0.025, and the unit of V is cm3(ii) a M is a compensation parameter and takes a value of 1-3. When the alpha is less than 0.005, the thickness of the cold insulation layer is lower, the cold insulation effect is poor, and the cooling time is longer; when alpha is larger than 0.025, the thickness of the cold insulation layer is large, the temperature in the base 1 is low, and when the concrete sample 15 is cooled, the device is kept at a low temperature for a long time, the material of the device becomes fragile, the strength of the device is reduced, and the device is easy to damage and crack.
The device obtained by the technical scheme is a concrete setting strength detection device, during an experiment, firstly, a concrete sample 15 is made into a structure as shown in fig. 7, a base 1 is arranged on the upper surface of the concrete sample 15, then, nitrogen is introduced into the base 1 to cool the concrete sample 15, when the temperature reaches a preset threshold value, a power mechanism 6 is started, a lifting mechanism 5 moves downwards, a push rod 1103 is contacted with the top of the concrete sample 15, two clamping arms 1102 are unfolded, when the lifting mechanism 5 moves downwards for a certain distance, the two second connecting rods 1104 are located on the other side of the initial position, and meanwhile, under the action of a second spring, the two clamping arms 1102 clamp an experiment block 16 on the concrete sample 15, and then the lifting mechanism 15 moves upwards. When the experiment block 16 is broken, the tension of the tension sensor is recorded, and the strength of the concrete sample 15 is calculated through the tension.
Calculating the strength of concrete by tension is a conventional technical means in the art, and the principle thereof will not be described herein.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention; any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention; any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A method for detecting the concrete setting strength in a low-temperature environment is characterized by comprising the following steps:
s1: preparing a concrete sample, namely grinding the concrete sample to prepare an experimental block meeting the requirement, so that subsequent clamping detection is facilitated;
s2: placing the concrete strength detection device in place, placing the concrete setting strength detection device above a concrete sample, and aligning the clamping mechanism to the experiment block;
s3: cooling the concrete sample, introducing a cooling medium into the concrete condensation strength detection device, and cooling the concrete;
s4: stretching the experimental block, and starting a concrete setting strength detection device to perform tensile fracture detection on the experimental block when the concrete sample reaches a certain temperature;
s5: and (4) data processing, wherein when the experimental block is broken, the data of the tension sensor on the concrete strength detection device is recorded, and the tension value is converted into the strength value of the concrete.
2. The method as claimed in claim 1, wherein in step S1, a groove is formed on the lower side of the test block to facilitate positioning between the clamping mechanism and the test block, and the clamping mechanism acts on the groove to facilitate clamping and stretching of the test block.
3. The method for detecting the concrete setting strength under the low-temperature environment according to any one of claims 1 to 2, wherein in step S3, a temperature measuring device is provided in the concrete sample detecting device, and the temperature of the concrete sample can be known in time through the temperature measuring device.
4. The method for detecting concrete setting strength under a low temperature environment according to claim 1 or 3, wherein in step S5, when the test block and the concrete sample are broken and separated, the value of the tension sensor is recorded.
5. The method for detecting the concrete condensation strength under a low temperature environment according to any one of claims 1 to 4, wherein in step S3, when the concrete sample is cooled, the cooling medium used is liquid nitrogen, and the concrete strength detection device is connected with a condensation tank, and the liquid nitrogen is contained in the condensation tank.
6. The method for detecting the concrete setting strength in a low-temperature environment according to any one of claims 1, wherein in step S4, the power device of the concrete strength detecting device is an electric motor or a hydraulic motor.
7. The method for detecting the concrete setting strength under the low temperature environment according to any one of claim 1, wherein in step S5, the tension sensor is connected with a controller, the controller is connected with a display, and the display is used for displaying the tension value of the tension sensor.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104198283A (en) * | 2014-09-02 | 2014-12-10 | 建研科技股份有限公司 | Pulling-out instrument control method for automatically detecting concrete strength |
| CN204064802U (en) * | 2014-09-02 | 2014-12-31 | 建研科技股份有限公司 | A kind of claw structure of instrument for testing compressive strength of concrete |
| CN105067440A (en) * | 2015-09-07 | 2015-11-18 | 建研科技股份有限公司 | Device and method for detecting tensile strength of concrete by Czochralski method |
| CN206002361U (en) * | 2016-08-12 | 2017-03-08 | 郑州大学 | Concrete direct tensile test test specimen, specimen molding mould and complexes |
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| CN108709796A (en) * | 2018-07-03 | 2018-10-26 | 三峡大学 | Uniform section breaking device and method is axially stretched in concrete |
| CN110618038A (en) * | 2019-08-16 | 2019-12-27 | 同济大学 | Testing device and testing method for concrete stress deformation in extreme temperature environment |
| CN211148308U (en) * | 2019-11-11 | 2020-07-31 | 中海石油气电集团有限责任公司 | Be applied to concrete unipolar tensile test's low temperature insulation can |
| CN212539958U (en) * | 2020-10-16 | 2021-02-12 | 程彦 | Concrete axle center tensile strength inserted sheet clamping method normal position detection device |
| CN113203636A (en) * | 2021-05-11 | 2021-08-03 | 吴海涛 | Concrete setting strength detection device |
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