Warm-pressing forming device for super high-strength concrete material and using method

Abstract

The invention provides a warm-pressing forming device for a super high-strength concrete material and a using method, the warm-pressing forming device comprises a mechanical pressurizing part, a concrete warm-pressing forming part, a temperature and humidity environment box, a moving track part and a control part, and the using method comprises the steps that (1) the super high-strength concrete slurry material is prepared; (2) filling a mold with a super high-strength concrete slurry material, and performing ultrasonic dispersion and compaction; (3) an upper loading clamp of the mechanical pressurizing part is adjusted to be flush with the surface of the concrete pressurizing area; (4) moving the temperature and humidity environment box and enabling the temperature and humidity environment box to completely surround the concrete warm-pressing forming part; and 5) inputting temperature and pressure parameters into the control part and starting the test. Compared with the prior art, the method has the advantages that a concrete compression molding test within the range of room temperature to 600 DEG C can be realized, and a super high-strength concrete material with the compressive strength of 500-800 MPa is prepared. The method has the advantages of simplicity in operation, high technical feasibility, diversified functions and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of special concrete preparation and molding, and specifically relates to a temperature-pressure molding device and a use method for super high-strength concrete materials. Background Art

[0002] Concrete is the largest bulk building structural material of mankind at present and plays an irreplaceable role in the construction industry. As the key to bearing pressure and supporting the structure, the strength of concrete directly affects its serviceability and safety in basic building facilities. Higher strength of concrete can ensure that it can maintain the structural integrity and performance stability even in extreme environments such as marine environments, high temperatures, and low temperatures, thus realizing the ultra-long life service of concrete projects. Therefore, ensuring the reliable strength of concrete and achieving high-strength or even ultra-high-strength of concrete is a crucial link in material design and research, which is related to the safety and durability of concrete structures throughout their life cycle.

[0003] Since the British invented cement in 1824, the concrete technology with cement as the main cementing material has also started its development process, and the concrete strength has also achieved a leap from ordinary strength (C15-C50) to high strength (C60-C90) and ultra-high strength (C100-C200). In order to achieve higher development of concrete strength, researchers have optimized the design of active powder materials such as cement, silica fume, fly ash, etc. and fine quartz sand aggregates with different grading ranges by using the dense packing theory, so as to prepare ultra-high performance concrete with a compressive strength of 200 MPa to 500 MPa. However, it is found that the existing ultra-high performance concrete is all designed based on the dense packing theory by calculating the natural packing of powder materials and fresh slurry, and it is difficult to achieve a breakthrough in the strength limit of concrete materials.

[0004] In order to achieve a breakthrough in the strength limit of concrete, the applicant has proposed an ultra-dense packing design theory and method that can prepare super high-strength concrete (compressive strength ≥ 500 MPa) by comprehensively considering the compaction characteristics of dry powder and wet powder under the action of temperature and load and the hydration densification effect of active powder materials such as cement. Therefore, the technical problem to be solved urgently at present is: how to realize the actual preparation and testing technology of super high-strength concrete with a compressive strength ≥ 500 MPa. Summary of the Invention

[0005] The present invention is made to solve the above problems, and the purpose is to provide a temperature-pressure molding device and a use method for super high-strength concrete materials, so as to realize the actual preparation and testing of super high-strength concrete with a compressive strength ≥ 500 MPa.

[0006] The present invention provides a temperature and pressure forming device for ultra-high strength concrete materials, having the following characteristics, including: a mechanical pressure application part for the pressure forming and mechanical property testing of ultra-high strength concrete materials; a concrete temperature and pressure forming part arranged on the mechanical pressure application part and used to cooperate with the mechanical pressure application part to achieve the pressure application to ultra-high strength concrete materials; a temperature and humidity environment box for controlling the temperature and humidity during the curing process of ultra-high strength concrete materials; a moving track part for carrying and moving the temperature and humidity environment box and moving the temperature and humidity environment box to the positions of the mechanical pressure application part and the concrete temperature and pressure forming part; and a control part for connecting with the mechanical pressure application part and the temperature and humidity environment box to control the mechanical pressure application part and the temperature and humidity environment box.

[0007] In the temperature and pressure forming device for ultra-high strength concrete materials provided by the present invention, it may also have the following characteristics: wherein, the mechanical pressure application part can be used for the high-temperature high-pressure or ultra-high pressure forming and testing of C-S-H or other powder materials. The mechanical pressure application part includes: a frame unit, which includes a fixed frame and a motor mechanism arranged at the bottom of the fixed frame. The fixed frame includes fixed columns, a fixed cross beam arranged at the top of the fixed columns, and a movable cross beam movably arranged on the fixed columns. An emergency brake switch and a power switch are arranged on the motor mechanism; and a pressure rod unit arranged on the frame unit. The pressure rod unit includes an upper pressure rod arranged below the movable cross beam and a lower pressure rod arranged above the motor mechanism. The upper pressure rod includes an upper connecting rod, a mechanical sensor, an extended connecting rod, and an upper loading fixture connected in sequence. The extended connecting rod is a telescopic structure, and the rapid up and down movement of the pressure rod unit is achieved by adjusting the length of the extended connecting rod. The lower pressure rod includes a bearing platform and a lower connecting rod connected in sequence. The lower connecting rod is connected with the motor mechanism, and the concrete temperature and pressure forming part is arranged on the bearing platform.

[0008] In the temperature and pressure forming device for ultra-high strength concrete materials provided by the present invention, it may also have the following characteristics: wherein, the maximum test force of the mechanical pressure application part is 5000 kN to 20000 kN, the adjustment rate of the movable cross beam is 0.001 to 500 mm / min, and the displacement resolution is 0.001 to 0.01 μm.

[0009] In the warm pressing forming device for super high-strength concrete materials provided by the present invention, it may also have the following features: Among them, the concrete warm pressing forming part is arranged on the bearing platform, and the material is specially made high-temperature resistant high-strength steel. The high-temperature resistant high-strength steel can withstand long-term temperature changes from -20°C to 600°C and load effects from 5000 kN to 20000 kN without deformation. The super high-strength concrete obtained by warm pressing and forming in the concrete warm pressing forming part is a cubic concrete specimen with a side length of 10 mm to 1000 mm. The number of super high-strength concrete that can be directly pressed and formed at one time is 1 to 4. The concrete warm pressing forming part includes: an upper pressing plate, which is used to cooperate with the upper loading fixture to realize the pressurization of the super high-strength concrete material; an upper pressing head, which is arranged at the bottom of the upper pressing plate, and the upper pressing head is a single upper pressing head or multiple upper pressing heads; a mold, which is connected to the upper pressing plate through a guide rod. The mold is located below the upper pressing plate and the upper pressing head. Different-sized embedded wedges for pressing the super high-strength concrete are arranged inside the mold. The embedded wedges are used to press and form super high-strength concrete of different sizes and quantities. The mold includes a front pressing mold, a rear pressing mold, and a lower pressing mold connected by fixing bolts. Both ends of the lower pressing mold are respectively connected to both ends of the upper pressing plate through guide rods, and the guide rods are used for guiding the up and down pressurization; a water filtering and pressing part, which is used to discharge the excess water inside the super high-strength concrete, including a filter screen switch, a connecting water pipe, a water outlet, and an ultrasonic vibration device and a moisture content real-time detection element arranged at the bottom of the water filtering and pressing part. The excess water is discharged from the water outlet through the filter screen switch and the connecting water pipe. The ultrasonic vibration device is used to accelerate the rapid adsorption and uniform dispersion of water on the surface of the super high-strength concrete material, and the moisture content detection element is used to dynamically monitor and feedback the quantity of excess water squeezed out during the pressurization and forming process of the super high-strength concrete in real time; and a flexible protective cover, which is sleeved outside the mold. The material of the flexible protective cover includes PVC cloth, asbestos fiber, nylon leather, plastic cloth, and three-proof cloth. The thickness of the flexible protective cover is 5 mm to 15 mm, which is used to prevent the explosion damage of the super high-strength concrete material during high-temperature pressurization and forming or mechanical testing from damaging the temperature and humidity environment chamber.

[0010] In the warm pressing forming device for super high-strength concrete materials provided by the present invention, it may also have the following features: Among them, the temperature and humidity environment chamber includes a temperature and humidity environment chamber housing, an observation window, and a humidity control unit. An upper reserved hole and an upper avoidance groove for avoiding the upper connecting rod are arranged above the temperature and humidity environment chamber housing. A detachable upper mounting plate is arranged on the upper avoidance groove. A lower reserved hole and a lower avoidance groove for avoiding the lower connecting rod are arranged below the temperature and humidity environment chamber housing. A detachable lower mounting plate is arranged on the lower avoidance groove.

[0011] In the warm pressing forming device for super high-strength concrete materials provided by the present invention, it may further have the following characteristics: Among them, the temperature control method of the temperature and humidity environment box includes heating by electric heating wires and cooling by compressing refrigerant or coolant. The temperature control range of the temperature and humidity environment box is -20°C to 600°C, and the humidity control range of the temperature and humidity environment box is a relative humidity of 30% to 98%.

[0012] In the warm pressing forming device for super high-strength concrete materials provided by the present invention, it may further have the following characteristics: Among them, the moving track part includes a moving track frame, moving track columns and moving wheels. The temperature and humidity environment box housing is arranged on the moving track frame, and the moving track columns are arranged below the moving track frame for supporting the moving track frame. The moving wheels are arranged below the moving track columns for moving the moving track part.

[0013] In the warm pressing forming device for super high-strength concrete materials provided by the present invention, it may further have the following characteristics: Among them, the control part includes: an operation unit, including a temperature control panel, a computer display screen and a computer mainframe. The temperature control panel includes a temperature parameter display screen and temperature adjustment keys, which are arranged on the side of the temperature and humidity environment box housing for setting specific temperature test parameters. The computer display screen and the computer mainframe are connected to the mechanical pressurizing part and the temperature and humidity environment box through data connection lines, so as to realize the parameter setting of the mechanical pressurizing part and the temperature and humidity environment box; and a control unit, which realizes the temperature and pressure control of the super high-strength concrete materials by adjusting the operation unit, so that it can be hot pressed and formed to obtain super high-strength concrete specimens that meet the specified dimensional requirements.

[0014] The present invention also provides a method for using a warm pressing forming device for super high-strength concrete materials, which comprises the following steps: S1, designing a new mix proportion of super high-strength concrete materials based on the theory of super close packing, and preparing super high-strength concrete paste materials; S2, weighing an appropriate amount of super high-strength concrete paste materials, completely filling them into a mold, and subjecting them to ultrasonic dispersion and compaction; S3, adjusting the upper loading fixture of the mechanical pressing part to be flush with the surface of the concrete pressing area; S4, moving the temperature and humidity environment box and completely surrounding the concrete warm pressing forming part, and ensuring that the flexible protective cover is completely in the core area for pressing the super high-strength concrete paste materials; S5, inputting temperature parameters and pressing parameters on the control part and starting the formal test. The temperature parameters include the target temperature, temperature rise and fall time, constant temperature time and number of cycles, and the pressing parameters include the target pressure, pressure increase / decrease rate and constant pressure time; S6, during the pressing and forming process, the super high-strength concrete paste materials can be refilled in multiple batches to ensure that the super high-strength concrete after pressing meets the specified dimensional requirements; S7, after the preparation of the super high-strength concrete by hot pressing and forming is completed, the specimens are cured for a certain period of time and under certain environmental conditions. The curing environment can be to continue to place them in the temperature and humidity environment box to adjust the high temperature, humidity and pressure for curing, or to move them into a standard curing room or a steam curing test box; S8, after the curing is completed, take out the super high-strength concrete specimens, place them in the mechanical pressing part, and start testing the mechanical properties of the super high-strength concrete specimens after ensuring that the flexible protective cover is installed properly.

[0015] In the method for using the warm pressing forming device for super high-strength concrete materials provided by the present invention, it may further have the following characteristics: Among them, the super high-strength concrete materials include the following raw material components: ultra-high-strength special cementitious materials, quartz powder with a particle size of 1μm to 10μm, nano powder materials with a particle size of 0.001μm to 0.1μm, quartz sand or metal steel powder aggregates with a particle size of 75μm to 1000μm, high-strength steel fibers with a diameter of 0.1mm to 1mm and a length of 2mm to 8mm, special ultra-high surface activity admixtures and a small amount of water. The ultra-high-strength special cementitious materials include P·O525 cement, silica fume with a particle size of 0.1μm to 0.5μm, and mineral powder with a particle size of 50μm to 100μm. The powder materials are at least one of nano-SiO2, nano-CaCO3 and nano-carbon fiber. The water-binder ratio of the super high-strength concrete materials is 0.03 to 0.1. The well-stirred super high-strength concrete materials are in a wet powder state and have no fluidity. Among them, the water-binder ratio specifically refers to the ratio of water to ultra-high-strength special cementitious materials.

[0016] Functions and effects of the invention

[0017] The warm pressing forming device and its usage method for super high-strength concrete materials according to the present invention have the following beneficial effects: The present invention is used for warm pressing forming of super high-strength concrete with a compressive strength of 500 - 800 MPa. Through the mutual cooperation of the mechanical pressing part, the concrete warm pressing forming part, the temperature and humidity environment box, the moving track part, and the control part, a load of 5000 kN - 20000 kN can be applied to the concrete material in a temperature environment of -20°C - 600°C, and a complex thermal field effect coordinated with different temperature changes and variable loads can be achieved, so as to better complete the pressing forming of super high-strength concrete materials and the mechanical property test. Brief Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of the warm pressing forming device for super high-strength concrete materials in the embodiment of the present invention;

[0019] Figure 2 is a schematic structural diagram of the mechanical pressing part in the embodiment of the present invention;

[0020] Figure 3 is a schematic structural diagram of the concrete warm pressing forming part with a single upper pressure head in the embodiment of the present invention;

[0021] Figure 4 is a schematic structural diagram of the concrete warm pressing forming part with multiple upper pressure heads in the embodiment of the present invention; and

[0022] Figure 5 is a schematic structural diagram of the water filtration pressure part in the embodiment of the present invention.

[0023] Explanation of Markings in the Drawings:

[0024] 1 - Warm pressing forming device for super high-strength concrete materials;

[0025] 10 - Mechanical pressing part, 101 - Motor mechanism, 102 - Fixed crossbeam, 103 - Moving crossbeam, 104 - Fixed column, 105 - Mechanical sensor, 106 - Extended connecting rod, 107 - Upper loading fixture, 108 - Bearing platform, 109 - Upper connecting rod, 110 - Lower connecting rod, 111 - Emergency brake switch, 112 - Power switch, 113 - Frame unit, 114 - Pressure rod unit; 20 - Temperature and humidity environment box, 201 - Temperature and humidity environment box housing, 202 - Observation window, 203 - Upper avoidance groove, 204 - Lower avoidance groove, 205 - Upper reserved hole, 206 - Humidity control unit, 207 - Upper mounting plate, 208 - Lower mounting plate;

[0026] 30 - Moving track part, 301 - Moving track frame, 302 - Moving track column, 303 - Moving wheel;

[0027] 40 - Concrete temperature and pressure forming section, 401 - Upper pressing plate, 402 - Single upper pressing head, 403 - Front pressing die, 404 - Rear pressing die, 405 - Fixed bolt, 406 - Lower pressing die, 407 - Embedded wedge block, 408 - Concrete specimen, 409 - Multiple upper pressing heads, 410 - Guide rod, 411 - Filter water pressure component, 412 - Filter screen switch, 413 - Connecting water pipe, 414 - Water outlet, 415 - Ultrasonic vibration device, 416 - Moisture content detection element, 417 - Die, 418 - Flexible protective cover; 50 - Control section, 501 - Computer display screen, 502 - Computer main unit, 503 - Data connection line, 504 - Temperature control panel, 505 - Temperature parameter display screen, 506 - Temperature adjustment key. Detailed implementation mode

[0028] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a connection that can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

[0029] In order to make the technical means, creative features, achieved purposes, and effects of the present invention easy to understand, the following embodiments will specifically elaborate on the temperature and pressure forming device and usage method of the super high-strength concrete material of the present invention in conjunction with the accompanying drawings.

[0030] Figure 1 It is a structural schematic diagram of the temperature and pressure forming device of the super high-strength concrete material in the embodiment of the present invention. Figure 2 It is a structural schematic diagram of the middle school pressurization system in the embodiment of the present invention.

[0031] Figure 3 It is a structural schematic diagram of the concrete temperature and pressure forming section of the single upper pressing head in the embodiment of the present invention. Figure 4 It is a structural schematic diagram of the concrete temperature and pressure forming section of the multiple upper pressing heads in the embodiment of the present invention.

[0032] As Figures 1-4 As shown, the temperature and pressure forming device 1 for super high-strength concrete material in this embodiment is used to temperature and pressure form super high-strength concrete material to obtain super high-strength concrete, and includes: mechanical pressurization section 10, concrete temperature and pressure forming section 40, temperature and humidity environment box 20, mobile track section 30, and control section 50.

[0033] As Figure 2As shown, the mechanical pressure application part 10 is used for the pressure forming and mechanical property testing of ultra-high-strength concrete materials.

[0034] The mechanical pressure application part 10 can be used for the high-temperature, high-pressure or ultra-high-pressure forming and testing of C-S-H or other powder materials. The mechanical pressure application part 10 includes a frame unit 113 and a pressure rod unit 114.

[0035] The frame unit 113 includes a fixed frame and a motor mechanism 101 arranged at the bottom of the fixed frame. The fixed frame includes fixed columns 104, a fixed crossbeam 102 arranged at the top of the fixed columns 104, and a movable crossbeam 103 movably arranged on the fixed columns 104. An emergency brake switch 111 and a power switch 112 are arranged on the motor mechanism 101. Among them, the power switch 112 is used to turn on and off the motor mechanism 101, and the emergency brake switch 111 is used to shut down the motor mechanism 101 in case of an emergency.

[0036] The pressure rod unit 114 is arranged on the frame unit 113. The pressure rod unit 114 includes an upper pressure rod arranged below the movable crossbeam 103 and a lower pressure rod arranged above the motor mechanism 101. The upper pressure rod includes an upper connecting rod 109, a mechanical sensor 105, an extended connecting rod 106, and an upper loading fixture 107 connected in sequence. The extended connecting rod 106 is a telescopic structure. By adjusting the length of the extended connecting rod 106, the rapid up and down movement of the pressure rod unit 114 can be realized. The lower pressure rod includes a bearing platform 108 and a lower connecting rod 110 connected in sequence. The lower connecting rod 110 is connected to the motor mechanism 101. The concrete temperature and pressure forming part 40 is arranged on the bearing platform 108.

[0037] In this embodiment, the extended connecting rod 106 is a conventional telescopic connecting rod structure (not shown in the figure). For example, it includes two connecting rods. One connecting rod is provided with internal threads, and the other connecting rod is provided with external threads that match the internal threads. The relative position of the internal threads and the external threads is adjusted by rotating the connecting rod to achieve telescoping.

[0038] The maximum test force of the mechanical pressure application part 10 is 5000 kN to 20000 kN. The adjustment rate of the movable crossbeam 103 is 0.001 to 500 mm / min, and the displacement resolution is 0.001 to 0.01 μm.

[0039] As Figures 3-4 shown, the concrete temperature and pressure forming part 40 is arranged on the bearing platform 108 of the mechanical pressure application part 10 and is used to cooperate with the pressure rod unit 114 of the mechanical pressure application part 10 to realize the pressure application on the ultra-high-strength concrete materials. The material of the concrete temperature and pressure forming part is a special high-temperature-resistant and high-strength steel. The high-temperature-resistant and high-strength steel can withstand long-term temperature changes from -20°C to 600°C and load effects of 5000 kN to 20000 kN without deformation.

[0040] The concrete warm pressing forming unit 40 includes an upper pressing plate 401 , an upper pressing head, a mold 417 , a water filtering pressing piece 411 and a flexible protective cover 418 .

[0041] The upper pressure plate 401 is used to cooperate with the upper loading fixture 107 to achieve pressurization of the super high-strength concrete material.

[0042] The upper pressure head is arranged at the bottom of the upper pressure plate 401 , and the upper pressure head may be a single upper pressure head 402 or multiple upper pressure heads 409 .

[0043] The mold 417 is connected to the upper platen 401 through guide rods 410 respectively arranged on the left and right sides. The mold 417 is located below the upper platen 401 and the upper pressure head. The mold 417 is provided with embedded wedges 407 of different sizes and specifications for pressing super high-strength concrete. The embedded wedges 407 are used to press and form super high-strength concrete of different sizes and quantities. The mold 417 includes a front pressing mold 403, a rear pressing mold 404 and a lower pressing mold 406 connected by fixing bolts 405. The two ends of the lower pressing mold 406 are connected to the two ends of the upper platen 401 by guide rods 410 respectively. The guide rods 410 are used for upward and downward pressure guidance.

[0044] Figure 5 It is a schematic diagram of the structure of the water filter pressure piece in an embodiment of the present invention.

[0045] like Figure 5 As shown, the water filter pressure piece 411 is used to discharge the excess water inside the super high strength concrete, including a filter switch 412, a water pipe 413, a water outlet 414, and an ultrasonic vibration device 415 and a moisture content real-time detection element arranged at the bottom of the water filter pressure piece 411. Excess water is discharged from the water outlet 414 through the filter switch 412 and the water pipe 413. The ultrasonic vibration device 415 is used to accelerate the rapid adsorption and uniform dispersion of water on the surface of the super high strength concrete material, so that all solid phase powder materials quickly form a stable and dense homogeneous state. The moisture content detection element 416 is used to dynamically monitor and feedback the amount of excess water extruded from the super high strength concrete during the pressurization molding process in real time.

[0046] The flexible protective cover 418 is sleeved on the outside of the mold 417. The materials of the flexible protective cover 418 include PVC cloth, asbestos fiber, nylon leather, plastic cloth and three-proof cloth. The thickness of the flexible protective cover 418 is 5mm to 15mm. It is used to prevent the explosion damage of super high-strength concrete materials during high-temperature pressure molding or mechanical testing from damaging the temperature and humidity environment box 20.

[0047] The temperature and humidity environment box 20 is used to control the temperature and humidity during the curing process of the super high-strength concrete material.

[0048] The temperature and humidity environmental chamber 20 includes a temperature and humidity environmental chamber housing 201, an observation window 202, and a humidity control unit 206.

[0049] Above the temperature and humidity environmental chamber housing 201, there are an upper reserved hole 205 and an upper avoidance groove 203 for avoiding the upper connecting rod 109. A detachable upper mounting plate 207 is provided on the upper avoidance groove 203.

[0050] Below the temperature and humidity environmental chamber housing 201, there are a lower reserved hole (not shown in the figure) and a lower avoidance groove 204 for avoiding the lower connecting rod 110. A detachable lower mounting plate 208 is provided on the lower avoidance groove 204.

[0051] The temperature control method of the temperature and humidity environmental chamber 20 includes heating with an electric heating wire and cooling by compressing a refrigerant or a coolant. The temperature control range of the temperature and humidity environmental chamber 20 is -20°C to 600°C, and the humidity control range of the temperature and humidity environmental chamber 20 is a relative humidity of 30% to 98%. It can not only achieve the high-temperature or temperature-pressure curing of the concrete with a mold 417, but also achieve the high-temperature and high-humidity curing of the concrete without a mold 417.

[0052] The moving track part 30 is used to carry and move the temperature and humidity environmental chamber 20, and move the temperature and humidity environmental chamber 20 to the positions of the mechanical pressurizing part 10 and the concrete temperature-pressure forming part 40.

[0053] The moving track part 30 includes a moving track frame 301, moving track columns 302, and moving wheels 303. The temperature and humidity environmental chamber housing 201 is arranged on the moving track frame 301. The moving track columns 302 are arranged below the moving track frame 301 and are used to support the moving track frame 301. The moving wheels 303 are arranged below the moving track columns 302 and can move the moving track part 30 quickly in all directions.

[0054] The control part 50 is used to connect with the mechanical pressurizing part 10 and the temperature and humidity environmental chamber 20, so as to control the mechanical pressurizing part 10 and the temperature and humidity environmental chamber 20.

[0055] The control part 50 includes an operation unit and a control unit.

[0056] The operation unit includes a temperature control panel 504, a computer display screen 501, and a computer main unit 502. The temperature control panel 504 includes a temperature parameter display screen 505 and temperature adjustment keys 506, which are arranged on the side of the temperature and humidity environmental chamber housing 201 and are used to set specific temperature test parameters. The computer display screen 501 and the computer main unit 502 are connected to the mechanical pressurizing part 10 and the temperature and humidity environmental chamber 20 through a data connection line 503, so as to realize the parameter setting of the mechanical pressurizing part 10 and the temperature and humidity environmental chamber 20.

[0057] The control unit realizes the regulation of the temperature and pressure of the ultra-high-strength concrete material by adjusting the operating unit, so that it can be hot-pressed into shape to obtain an ultra-high-strength concrete specimen 408 that meets the specified dimensional requirements.

[0058] The usage method of the temperature and pressure forming device 1 for ultra-high-strength concrete material in the present invention specifically includes the following steps:

[0059] S1, Design a new mix ratio of ultra-high-strength concrete material based on the ultra-close packing theory, and prepare the ultra-high-strength concrete paste material.

[0060] S2, Weigh an appropriate amount of ultra-high-strength concrete paste material, completely fill it into the mold 417, and subject it to ultrasonic dispersion and compaction.

[0061] S3, Adjust the upper loading fixture 107 of the mechanical pressurizing part 10 to be flush with the surface of the concrete pressurizing area.

[0062] S4, Move the temperature and humidity environment box 20 and make it completely surround the concrete temperature and pressure forming part 40, and ensure that the flexible protective cover 418 is completely in the core area of pressing the ultra-high-strength concrete paste material.

[0063] S5, Input the temperature parameters and pressurizing parameters on the control part 50, and start the formal test. The temperature parameters include the target temperature, heating and cooling time, constant temperature time and number of cycles, and the pressurizing parameters include the target pressure, pressurizing / depressurizing rate and constant pressure time.

[0064] S6, During the pressurizing and forming process, the ultra-high-strength concrete paste material can be refilled in multiple batches to ensure that the ultra-high-strength concrete after pressurizing meets the specified dimensional requirements.

[0065] S7, After the preparation of the ultra-high-strength concrete by hot pressing is completed, the specimen is cured for a certain time and under certain environmental conditions. The curing environment can be to continue to be placed in the temperature and humidity environment box 20 to adjust the high temperature, humidity and pressure for curing, or it can be moved into a standard curing room or a steam curing test box.

[0066] S8, After the curing is completed, take out the ultra-high-strength concrete specimen 408, place it in the mechanical pressurizing part 10, and start testing the mechanical properties of the ultra-high-strength concrete specimen 408 after ensuring that the flexible protective cover 418 is installed.

[0067] Among them, the ultra-high-strength concrete material in step S1 includes the following raw material components: ultra-high-strength special cementitious material, quartz powder with a particle size of 1 μm to 10 μm, nano powder material with a particle size of 0.001 μm to 0.1 μm, quartz sand or metal steel powder aggregate with a particle size of 75 μm to 1000 μm, high-strength steel fiber with a diameter of 0.1 mm to 1 mm and a length of 2 mm to 8 mm, special ultra-high surface activity admixture and a small amount of water.

[0068] The ultra-high strength special cementitious material includes P·O 525 cement, silica fume with a particle size of 0.1μm - 0.5μm, and mineral powder with a particle size of 50μm - 100μm.

[0069] The powder material is at least one of nano-SiO2, nano-CaCO3, and nano-carbon fiber.

[0070] The water-binder ratio of the super-high strength concrete material is 0.03 - 0.1. The well-stirred super-high strength concrete material is in a wet powder state and has no fluidity. Here, the water-binder ratio specifically refers to the ratio of water to the ultra-high strength special cementitious material.

[0071] In the present invention, the super-high strength concrete obtained by warm pressing and forming in the concrete warm pressing and forming part 40 is a cubic concrete specimen 408 with a side length of 10mm - 1000mm. The number of super-high strength concrete specimens that can be directly pressed and formed at one time is 1 - 4.

[0072] The working principle of the present invention is specifically as follows:

[0073] This device can apply a loading force of 5000kN - 20000kN to the concrete material in a temperature environment of -20°C - 600°C, so as to prepare a super-high strength concrete material with a compressive strength of 500 - 800MPa. At the same time, by replacing the special embedded wedges 407 in the upper punch and the lower mold, 1 - 4 cubic concrete specimens 408 with a side length of 10 - 1000mm can be formed at one time. In addition, through this device, different size concrete strength tests under different temperature environments can also be realized.

[0074] Before the test, according to the ultra-close packing theory, design the mix ratio of the new type of super-high strength concrete material, and prepare the fresh concrete paste material. Weigh an appropriate amount of the fresh concrete paste material and completely fill it into the mold 417; turn on the power supplies of the mechanical pressure application part 10, the temperature and humidity environment box 20, and the control part 50. Adjust the adaptation of the mechanical pressure application part 10 and the temperature and humidity environment box 20 by adjusting the extended connecting rod 106. Install an upper punch that matches the number and size of the warm pressing mold 417 at the bottom of the upper loading fixture 107; move the temperature and humidity environment box 20 to the mechanical pressure application part 10 and make it completely correspond to it, ensure that the warm pressing mold 417 is completely inside the temperature and humidity environment box, and close the observation window 202 on the temperature and humidity environment box 20;

[0075] During the test, temperature parameters such as the target temperature, heating / cooling time, constant temperature time, and number of cycles are set on the temperature control panel 504 of the control unit 50 or the temperature and humidity environmental chamber 20, and pressure parameters such as the target temperature, pressure increase / decrease rate, and constant pressure time are input on the control unit 50. When the set target temperature is reached, the concrete pressure forming test is automatically started, and the pressure is stopped after the set pressure parameters are completed. During the pressure forming process, fresh concrete paste materials can be refilled in multiple batches to ensure the specified size requirements of the concrete after pressure. After the test, the temperature and humidity environmental chamber 20 is removed, and the screws on the pressure die 417 are unscrewed with a hex wrench to take out the middle concrete specimen 408. The specimen is cured for a certain period of time and under certain environmental conditions. The curing environment can be continued to be placed in the temperature and humidity environmental chamber 20 to adjust the high temperature, humidity, and pressure for curing, or it can be moved into the standard curing room or the steam curing test chamber. After the curing is completed, the concrete specimen 408 is taken out and placed in the mechanical pressure part 10. After ensuring that the flexible protective cover 418 is installed, the mechanical properties of the concrete specimen 408 are tested.

[0076] Functions and effects of the embodiment

[0077] According to the temperature and pressure forming device and its use method for super high-strength concrete materials involved in the present invention, the following beneficial effects are achieved:

[0078] The present invention is used for the temperature and pressure forming of super high-strength concrete with a compressive strength of 500 - 800 MPa. Through the mutual cooperation of the mechanical pressure part, the concrete temperature and pressure forming part, the temperature and humidity environmental chamber, the moving track part, and the control part, a load of 5000 kN - 20000 kN can be applied to the concrete material in a temperature environment of -20°C - 600°C, and a complex thermal field effect of different temperature changes and variable loads can be realized, so as to better complete the pressure forming and mechanical property testing of super high-strength concrete materials.

[0079] By replacing the special inlaid wedges in the upper punch and the lower die, the present invention can form 1 - 4 cube concrete test blocks with side lengths of 10 - 1000 mm in a single time, meeting the rapid forming requirements of different time dimensions, test conditions, and application environments.

[0080] The present invention can quickly set a variety of complex temperature parameters and mechanical parameters, and can monitor and feedback the temperature and pressure parameters during the forming test in real time, perform rapid and safe braking on emergencies encountered during the test, and has a safety prevention and damage reduction effect on the possible concrete explosion behavior during the test process.

[0081] The operation of the present invention is simple, easy to implement, and has a wide range of applications. It can not only be used for the warm pressing forming of super high-strength concrete, but also realize the high-temperature, high-humidity, and high-pressure curing of concrete specimens with or without molds. Moreover, by replacing different fixtures, it can test the mechanical properties of concrete under different temperature environments, such as compressive strength, flexural strength, tensile strength, elastic modulus, etc.

[0082] The present invention has improved the mix proportion of the new super high-strength concrete material. The mix proportion of the concrete is designed by using the theory of super close packing and the theory of critical water film thickness. By considering the dry and wet powder packing parameters, the warm pressing densification parameters of the cement paste, and the hydration densification characteristics and parameters of the hardened cement paste, the packing structure parameters of the cement hydration products are hierarchically designed from the nano-scale, micro-scale, and macro-scale, effectively improving the compressive strength of the concrete.

[0083] By providing upper reserved holes, lower reserved holes, upper avoidance grooves, and lower avoidance grooves, the moving track part can drive the temperature and humidity environment box to move in all directions until it completely surrounds the warm pressing forming part and the concrete specimen.

[0084] Through the installation of the flexible protective cover, it can effectively prevent the explosion of the concrete specimen during the high-temperature pressure forming or mechanical testing from damaging the temperature and humidity test chamber, reducing the experimental cost.

[0085] Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A warm pressing forming device for super high-strength concrete materials, which is used to warm press and form super high-strength concrete materials to obtain super high-strength concrete, and is characterized in that Comprising: A mechanical pressing part, which is used for the pressing and forming of the super high-strength concrete material and the mechanical property testing; A concrete warm pressing forming part, which is arranged on the mechanical pressing part and is used to cooperate with the mechanical pressing part to realize the pressing of the super high-strength concrete material; A temperature and humidity environment box, which is used to control the temperature and humidity during the curing process of the super high-strength concrete material; A moving track part, which is used to carry and move the temperature and humidity environment box and move the temperature and humidity environment box to the positions of the mechanical pressing part and the concrete warm pressing forming part; and A control part, which is used to be connected with the mechanical pressing part and the temperature and humidity environment box to control the mechanical pressing part and the temperature and humidity environment box.

2. The warm pressing forming device for super high-strength concrete materials according to claim 1, It is characterized in that: Wherein, The mechanical pressing part can be used for the high-temperature high-pressure or ultra-high-pressure forming and testing of C-S-H or other powder materials. The mechanical pressing part includes: A frame unit, which includes a fixed frame and a motor mechanism arranged at the bottom of the fixed frame. The fixed frame includes fixed columns, a fixed cross beam arranged at the top of the fixed columns, and a movable cross beam movably arranged on the fixed columns. An emergency brake switch and a power switch are arranged on the motor mechanism; And A pressure bar unit, which is arranged on the frame unit. The pressure bar unit includes an upper pressure bar arranged below the movable cross beam and a lower pressure bar arranged above the motor mechanism. The upper pressure bar includes an upper connecting rod, a mechanical sensor, an extended connecting rod and an upper loading fixture connected in sequence. The extended connecting rod is a telescopic structure, and the rapid up and down movement of the pressure bar unit is realized by adjusting the length of the extended connecting rod. The lower pressure bar includes a bearing platform and a lower connecting rod connected in sequence. The lower connecting rod is connected with the motor mechanism, and the concrete warm pressing forming part is arranged on the bearing platform.

3. The warm pressing forming device for super high-strength concrete materials according to claim 2, characterized in that: Among them, The maximum test force of the mechanical pressing part is 5000kN to 20000kN, the adjustment rate of the movable cross beam is 0.001 to 500mm / min, and the displacement resolution is 0.001 to 0.01μm.

4. The warm compression forming device for super high-strength concrete materials according to claim 2, It is characterized in that: Wherein, The concrete warm pressing forming part is arranged on the bearing platform, and the material is a special high-temperature resistant and high-strength steel. The high-temperature resistant and high-strength steel can withstand long-term temperature changes from -20°C to 600°C and load effects from 5000kN to 20000kN without deformation, The super high-strength concrete obtained by warm pressing and forming of the concrete warm pressing forming part is a cubic concrete specimen with a side length of 10mm to 1000mm, and the number of super high-strength concrete that can be directly pressed and formed at one time is 1 to 4, The concrete warm pressing forming part includes: An upper pressure plate, which is used to cooperate with the upper loading fixture to realize the pressing of the super high-strength concrete material; An upper pressure head, which is arranged at the bottom of the upper pressure plate. The upper pressure head is a single upper pressure head or multiple upper pressure heads; The mold is connected to the upper pressing plate through guide rods. The mold is located below the upper pressing plate and the upper pressing head. Different-sized embedded wedges for pressing super-high-strength concrete are arranged inside the mold. The embedded wedges are used to press and form super-high-strength concrete of different sizes and quantities. The mold includes a front pressing mold, a rear pressing mold, and a lower pressing mold connected by fixing bolts. Both ends of the lower pressing mold are respectively connected to both ends of the upper pressing plate through guide rods, and the guide rods are used for guiding the up-and-down pressure application; The water filtering and pressing component is used to discharge the excess water inside the super-high-strength concrete, and includes a filter screen switch, a connecting water pipe, a water outlet, and an ultrasonic vibration device and a moisture content real-time detection element arranged at the bottom of the water filtering and pressing component. The excess water is discharged from the water outlet through the filter screen switch and the connecting water pipe. The ultrasonic vibration device is used to accelerate the rapid adsorption and uniform dispersion of water on the surface of the super-high-strength concrete material. The moisture content detection element is used to dynamically monitor and feedback the quantity of excess water extruded from the super-high-strength concrete during the pressurized forming process; and The flexible protective cover is sleeved outside the mold. The material of the flexible protective cover includes PVC cloth, asbestos fiber, nylon leather, plastic cloth, and three-proof cloth. The thickness of the flexible protective cover is 5 mm to 15 mm, and it is used to prevent the explosion damage that occurs during the high-temperature pressurized forming or mechanical testing of the super-high-strength concrete material from damaging the temperature and humidity environmental chamber.

5. The warm pressing and forming device for super-high-strength concrete material according to claim 4, wherein: Among them, The temperature and humidity environmental chamber includes a temperature and humidity environmental chamber housing, an observation window, and a humidity control unit. An upper reserved hole and an upper avoidance groove for avoiding the upper connecting rod are arranged above the temperature and humidity environmental chamber housing. A detachable upper mounting plate is arranged on the upper avoidance groove. A lower reserved hole and a lower avoidance groove for avoiding the lower connecting rod are arranged below the temperature and humidity environmental chamber housing. A detachable lower mounting plate is arranged on the lower avoidance groove.

6. The warm pressing and forming device for super-high-strength concrete material according to claim 5, wherein: Among them, The temperature control method of the temperature and humidity environmental chamber includes heating with an electric heating wire and cooling by compressing a refrigerant or a coolant. The temperature control range of the temperature and humidity environmental chamber is -20°C to 600°C, and the humidity control range of the temperature and humidity environmental chamber is a relative humidity of 30% to 98%.

7. The warm pressing and forming device for super-high-strength concrete material according to claim 5, wherein: Among them, The moving track part includes a moving track frame, moving track columns, and moving wheels. The temperature and humidity environmental chamber housing is arranged on the moving track frame. The moving track columns are arranged below the moving track frame and are used to support the moving track frame. The moving wheels are arranged below the moving track columns and are used to move the moving track part.

8. The warm compaction forming device for super high-strength concrete materials according to claim 7, It is characterized in that: Wherein, The control part includes: The operating unit includes a temperature control panel, a computer display screen, and a computer mainframe. The temperature control panel includes a temperature parameter display screen and temperature adjustment keys, and is set on the side of the housing of the temperature and humidity environmental chamber for setting specific temperature test parameters. The computer display screen and the computer mainframe are connected to the mechanical pressurizing part and the temperature and humidity environmental chamber through data connection lines, so as to realize the parameter setting of the mechanical pressurizing part and the temperature and humidity environmental chamber; and The control unit realizes the temperature and pressure regulation of the ultra-high-strength concrete material by adjusting the operating unit, so that it can be hot-pressed into shape to obtain ultra-high-strength concrete specimens that meet the specified dimensional requirements.

9. A method for using a warm pressing forming device for super high-strength concrete materials according to any one of claims 1-8, characterized in that, Specifically, it includes the following steps: S1. Design the mix ratio of the new ultra-high-strength concrete material based on the ultra-close packing theory, and prepare the ultra-high-strength concrete paste material; S2. Weigh an appropriate amount of the ultra-high-strength concrete paste material, completely fill it into the mold, and subject it to ultrasonic dispersion and compaction; S3. Adjust the upper loading fixture of the mechanical pressurizing part to be flush with the surface of the concrete pressurizing area; S4. Move the temperature and humidity environmental chamber and make it completely surround the concrete temperature and pressure forming part, and ensure that the flexible protective cover is completely in the core area of pressing the ultra-high-strength concrete paste material; S5. Input the temperature parameters and pressurizing parameters on the control part and start the formal test. The temperature parameters include the target temperature, heating and cooling time, constant temperature time, and number of cycles, and the pressurizing parameters include the target pressure, pressurizing / depressurizing rate, and constant pressure time; S6. During the pressurizing and forming process, the ultra-high-strength concrete paste material can be refilled in multiple batches to ensure that the ultra-high-strength concrete after pressurizing meets the specified dimensional requirements; S7. After the preparation of the ultra-high-strength concrete by hot pressing and forming is completed, the specimens are cured for a certain period of time and under certain environmental conditions. The curing environment can be to continue to place them in the temperature and humidity environmental chamber to adjust the high temperature, humidity, and pressure for curing, or to move them into a standard curing room or a steam curing test chamber; S8. After the curing is completed, take out the ultra-high-strength concrete specimens, place them in the mechanical pressurizing part, and start testing the mechanical properties of the ultra-high-strength concrete specimens after ensuring that the flexible protective cover is installed properly.

10. The method for using the temperature and pressure forming device for ultra-high-strength concrete materials according to claim 9, characterized in that: Among them, The ultra-high-strength concrete material includes the following raw material components: ultra-high-strength special cementitious material, quartz powder with a particle size of 1μm - 10μm, nano powder material with a particle size of 0.001μm - 0.1μm, quartz sand or metal steel powder aggregate with a particle size of 75μm - 1000μm, high-strength steel fibers with a diameter of 0.1mm - 1mm and a length of 2mm - 8mm, special ultra-high surface activity admixture, and a small amount of water, The ultra-high-strength special cementitious material includes P·O 525 cement, silica fume with a particle size of 0.1μm - 0.5μm, and mineral powder with a particle size of 50μm - 100μm, The powder material is at least one of nano-SiO2, nano-CaCO3, and nano-carbon fiber, The water-binder ratio of the super high-strength concrete material is 0.03 to 0.1, and the mixed super high-strength concrete material is in a wet powder state and has no fluidity.

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