A surface treatment device for coarse aggregate of ultra-high performance concrete and a method of use

Abstract

The application provides a coarse aggregate surface treatment device for ultra-high performance concrete and a use method, and belongs to the technical field of coarse aggregate treatment for ultra-high performance concrete, and comprises a storage barrel, a conveyor belt, a primary cleaning assembly, a film coating assembly, a modification pool, a film stripping assembly, a reaction pool, a secondary cleaning assembly, an aggregate barrel and a signal acquisition and control assembly. The coarse aggregate can be automatically transported in the above assemblies in turn, and the processing steps mainly include steps such as cleaning, film coating, modification, film stripping, reaction and secondary cleaning. The device and method can automatically clean, detect and pretreat the coarse aggregate, and according to design requirements, a product with a specified shape and size is generated at a specified position on the surface of the coarse aggregate, so that the surface of the coarse aggregate becomes more uneven, the roughness of the surface of the coarse aggregate is increased, the bonding strength of the coarse aggregate and the cement paste is improved, and then the strength of the UHPC is better improved, and the safety of the structure is increased.

Description

Technical Field

[0001] This invention belongs to the field of coarse aggregate treatment technology for ultra-high performance concrete, and specifically relates to a surface treatment device and method for coarse aggregate for ultra-high performance concrete. Background Technology

[0002] With the continuous advancement of modern construction technology, ultra-high performance concrete (UHPC), as a new type of high-performance material, is gradually demonstrating its unique advantages in engineering fields such as buildings, bridges, and tunnels. The successful preparation of UHPC relies heavily on the careful selection and scientific proportioning of its two key components: coarse aggregate and paste.

[0003] When a UHPC structure is subjected to loads exceeding its design limits during use, material failure may occur. This includes static loads (such as the building's own weight, equipment weight, etc.) and dynamic loads (such as traffic, wind pressure, earthquakes, etc.). The failure mode is mainly manifested as the formation and propagation of cracks, which may eventually lead to structural failure. Fundamentally, the failure location of UHPC can generally be divided into the following three types: coarse aggregate failure, cement paste failure, and failure at the bond surface between coarse aggregate and cement paste. Under normal circumstances, coarse aggregate and cement paste have high strength, and material failure only occurs in extreme cases. Failure at the bond surface between coarse aggregate and cement paste is the most common. This is because there is an interfacial transition zone at the bond surface between the aggregate and paste. The microstructure of this area is relatively weak, making it prone to stress concentration. Since the strength and density of this transition zone are usually lower than that of the aggregate and paste themselves, the bond surface is prone to failure first under tensile, shear, or bending loads. More seriously, the surface of coarse aggregate is relatively smooth, making it difficult for cement paste to adhere, which greatly weakens the strength of this bond surface. Furthermore, the material differences constituting UHPC (e.g., the hardness of aggregates is typically higher than that of cement paste) lead to stress concentration at the interface, increasing the likelihood of bond failure. Therefore, bond failure is the most common form of failure in UHPC structures.

[0004] Research has shown that damage to the bond between coarse aggregate and cement paste leads to a decrease in the overall compressive strength of concrete, affecting its load-bearing capacity and engineering safety. It also reduces the surface hardness and wear resistance of the concrete, decreasing its abrasion resistance. From a microscopic perspective, poor bonding causes microscopic voids, making the concrete more prone to cracking, thus reducing its durability and service life.

[0005] Improving this aspect would effectively enhance the compressive strength of UHPC, increasing the load-bearing capacity of engineering structures. Simultaneously, it would strengthen the durability of UHPC, as strong bonding reduces concrete permeability and cracking tendency, thus improving concrete durability and service life. Furthermore, it would improve the seismic performance of structures; good interfacial bonding effectively mitigates the impact of seismic loads on concrete structures, enhancing seismic resistance and ensuring engineering safety.

[0006] In view of the above problems, it is urgent and necessary to develop a device and method to increase the surface roughness of coarse aggregate, that is, to improve the bonding surface between coarse aggregate and cement paste. Such a device can fully automate the cleaning, inspection and pretreatment of coarse aggregate, making the smooth surface of coarse aggregate more uneven, and can mechanically control the shape of the surface of coarse aggregate, and directionally improve the size of the surface deposits of coarse aggregate, so as to better improve the strength of UHPC, thereby increasing the safety of the structure. Summary of the Invention

[0007] In view of this, the present invention provides a surface treatment device and method for coarse aggregates for ultra-high performance concrete, which can solve the problem of the lack of existing technology for automated cleaning, testing and pretreatment of coarse aggregates, making the smooth surface of coarse aggregates more uneven.

[0008] This invention is implemented as follows:

[0009] A first aspect of the present invention provides a surface treatment device for coarse aggregate in ultra-high performance concrete, comprising: a storage hopper, a primary cleaning component, a conveyor belt, a coating component, a modification tank, a demolding component, a reaction tank, a secondary cleaning component, an aggregate hopper, and a signal acquisition and control component; wherein,

[0010] The storage hopper is used to store the coarse aggregate to be processed and to convey it to the primary cleaning unit;

[0011] The primary cleaning component is used to thoroughly clean the surface of the coarse aggregate before the reaction, removing surface impurities and contaminants.

[0012] The coating assembly is used to cover the cleaned coarse aggregate surface with heat-shrink film to form a protective layer.

[0013] The modification tank is used to immerse the coated coarse aggregate in the modification liquid, so that the parts that need to be modified come into contact with the modification liquid and react, while the unreacted areas are protected by the heat-shrink film.

[0014] The stripping assembly is used to cut the heat-shrink film covering the surface of the coarse aggregate with a blade, and to recycle the heat-shrink film with two rollers, one above and one below, in preparation for the next step of entering the reaction tank.

[0015] The reaction tank is used to immerse the demolded coarse aggregate, so that the solution in the reaction tank reacts with the coarse aggregate in the reaction zone.

[0016] The secondary cleaning component is used to perform secondary deep cleaning on the reacted coarse aggregate;

[0017] The aggregate bin is used to collect the processed coarse aggregate, which will then be used as raw material for the subsequent preparation of ultra-high performance concrete.

[0018] The signal acquisition and control component is used to monitor and automate the various processes involved in the surface treatment of coarse aggregate.

[0019] Based on the above technical solution, the surface treatment device for coarse aggregate in ultra-high performance concrete of the present invention can be further improved as follows:

[0020] The storage hopper has a discharge port for placing coarse aggregate onto the conveyor belt at the end of the primary cleaning component; the primary cleaning component is used to transfer the coarse aggregate onto the heat-shrinkable film on the conveyor belt at the end of the coating component; the modification tank is located between the coating component and the stripping component; the reaction tank is located between the stripping component and the secondary cleaning component; the collection hopper is located below the end of the conveyor belt of the secondary cleaning component; and the signal acquisition and control component is communicatively connected to each component via signal lines.

[0021] Furthermore, the primary cleaning component and the secondary cleaning component have the same structure, both including a primary spray zone, a deep cleaning zone, a secondary spray zone, a drain hole, and a hot air blower; the primary spray zone and the secondary spray zone include high-pressure nozzles; the deep cleaning zone includes a multi-angle roller brush; the multi-angle roller brush includes cleaning brushes that rotate horizontally and vertically, used to automatically and thoroughly clean all surfaces of the coarse aggregate.

[0022] Furthermore, the coating assembly includes heat-shrink film, an arched flipping plate, a limiting plate, and a hot air blower; the heat-shrink film has pre-drilled holes; the two sides of the arched flipping plate and the vertical side plates on both sides of the conveyor belt are fixed, and the upper part is dome-shaped with a large entrance and a small exit; the conveyor belt narrows at the arched flipping plate; the heat-shrink film, originally laid flat on the conveyor belt, flips up on one side with the dome of the arched flipping plate after passing the arched flipping plate, covering the coarse aggregate; the limiting plate includes a fixing plate, a limiting spring, an inclined plate, and a straight plate; the fixing plate is fixed to the vertical side plates on both sides of the conveyor belt, the fixing plate is hinged to the inclined plate and connected by a spring, and the spring provides a pushing force to the inclined plate; the straight plate is fixedly connected to the inclined plate and is parallel to the vertical side plates on both sides of the conveyor belt; when the coarse aggregate passes the limiting plate, the limiting plate uses spring pressure to tightly press the coarse aggregate covered by the heat-shrink film against the inside of the heat-shrink film.

[0023] The coarse aggregate covered by heat shrink film passes through the hot air blowing zone. Under the action of the high temperature hot air blown out by the hot air blower, the heat shrink film shrinks and tightly wraps and adheres to all the outer surfaces of the coarse aggregate.

[0024] After coating, the heat-shrink film between the coarse aggregates shrinks into a thinner rope shape without breaking, and the coated coarse aggregates are connected together by the shrunken heat-shrink film.

[0025] Furthermore, the modification tank contains a modification liquid; the modification tank is lower than the height of the conveyor belt of the coating assembly; when the coated coarse aggregate reaches the modification tank, it will droop downwards and be completely immersed in the modification liquid. At this time, the reaction zone of the coated coarse aggregate allows the surface of this part of the coarse aggregate to directly contact the modification liquid and react through the reserved holes, while the unreacted zone is protected by the non-porous area of ​​the heat-shrinkable film, so that the surface of the coarse aggregate in the unreacted zone cannot contact the modification liquid and thus cannot react.

[0026] The materials of the modification tank and the heat-shrink film do not react with the modification liquid.

[0027] Furthermore, the demolding assembly includes a limiting plate, a spring blade, a reel, and a motor; a blade is fixed to the straight plate of the limiting plate; the spring blade is fixed to the vertical side plate of the conveyor belt, and the spring, through compression or extension, allows the spring blade to maintain contact with coarse aggregates of different particle sizes; the spring blade and the blade on the straight plate are located at the same height on both sides of the coarse aggregate, cutting the heat-shrink film covering the surface of the coarse aggregate into upper and lower parts; there is a reel at the upper and lower ends of the conveyor belt of the vertical demolding assembly, and the reels are driven by the motor to rotate; the upper and lower reels respectively retrieve the upper and lower parts of the heat-shrink film cut by the blade; the height of the conveyor belt of the demolding assembly is higher than the upper edge of the reaction tank; the demolded coarse aggregate is moved from between the upper and lower reels into the reaction tank.

[0028] The roller, driven by an electric motor, rotates and retracts the cut heat-shrink film, pulling the coated coarse aggregate from the reaction tank onto the conveyor belt of the decoction assembly, providing tension for the movement of the coated coarse aggregate and the heat-shrink film.

[0029] Furthermore, the reaction tank includes an outer wall, a drain box, and a hydraulic lifting rod; the drain box is located in the reaction tank and has a small hole at the bottom; the upper end of the hydraulic lifting rod is hinged to the vertical plates on both sides of the conveyor belt, and the lower end is hinged to the side wall of the drain box.

[0030] Furthermore, the signal acquisition and control components include a computer, a controller, a probe, and signal lines.

[0031] Furthermore, the end of the secondary cleaning component is equipped with a probe for detecting the position, size, and shape of silica generated on the surface of coarse aggregate, and saving the data to the computer.

[0032] A second aspect of the present invention provides a method of using a surface treatment apparatus for coarse aggregate in ultra-high performance concrete, wherein, using the above-described surface treatment apparatus for coarse aggregate in ultra-high performance concrete, the method includes the following steps:

[0033] Step 1: The storage hopper is controlled by a computer to release the required coarse aggregates sequentially onto the conveyor belt of the primary cleaning component;

[0034] Step 2: The conveyor belt transports the coarse aggregate to the primary spraying area of ​​the primary cleaning component. The computer automatically controls the nozzles to spray distilled water onto the surface of the coarse aggregate to wash away dust and impurities.

[0035] Step 3: The coarse aggregate is transported to the deep cleaning area, and multi-angle roller brushes clean all parts of the surface of the coarse aggregate.

[0036] Step 4: The coarse aggregate is conveyed to the secondary spraying area of ​​the primary cleaning component, where the computer automatically controls the spray nozzles to thoroughly wash away the dust remaining on the surface of the coarse aggregate.

[0037] Step 5: The coarse aggregate passes through the hot air drying zone of the primary cleaning component, where a hot air blower dries the coarse aggregate to completely remove moisture;

[0038] Step 6: The coarse aggregate is conveyed to the covering area of ​​the coating assembly with heat shrink film of different perforated shapes. The conveyor belt port has an arched flipping plate. After passing through this point, the heat shrink film automatically folds over and covers the coarse aggregate, completely covering the top and bottom of the coarse aggregate.

[0039] Step 7: When the coarse aggregate passes the limiting plate, the limiting plate uses spring pressure to keep the coarse aggregate covered by the heat shrink film tightly against the inside of the heat shrink film.

[0040] Step 8: The coarse aggregate covered with heat shrink film passes through the hot air blowing area. Under the action of the high temperature hot air blown out by the hot air blower, the heat shrink film shrinks and tightly wraps and adheres to all the outer surfaces of the coarse aggregate.

[0041] Step 9: Immerse the coarse aggregate covered with heat-shrink film in the silane coupling agent solution in the modification tank to fully react with the reaction zone of the coarse aggregate;

[0042] Step 10: The coated coarse aggregate, which has been soaked in silane coupling agent solution, is conveyed to the heat shrink film dismantling area. The two sides of the film removal assembly are blades with pressure springs and limit plates with blades. The coarse aggregate covered with heat shrink film is cut open on both sides by the blades, and the upper and lower rollers respectively collect the heat shrink film cut by the blades.

[0043] Step 11: Immerse the demolded coarse aggregate in a reaction tank containing a nano-silica solution to allow the reaction zone of the coarse aggregate to fully adsorb the nano-silica.

[0044] Step 12: Raise the hydraulic lifting rod of the drain box in the reaction tank, and pour the coarse aggregate with adsorbed nano-silica in the drain box into the primary spray area of ​​the secondary cleaning component to wash away the loose nano-silica.

[0045] Step 13: Convey the rinsed post-reaction coarse aggregate to the deep cleaning area, and use a multi-angle roller brush to clean the surface of the post-reaction coarse aggregate.

[0046] Step 14: In the secondary spray zone of the secondary cleaning component, rinse the surface of the coarse aggregate after the reaction again to ensure that the nano silica is firmly bonded to the reaction zone of the coarse aggregate.

[0047] Step 15: After cleaning, dry the reacted coarse aggregate and transport it to the collection hopper for later use.

[0048] Compared with existing technologies, the beneficial effects of the coarse aggregate surface treatment device and method for ultra-high performance concrete provided by the present invention are as follows: The device and method can automatically perform cleaning, testing and pretreatment of coarse aggregate. According to design requirements, by generating products of specified shape and size at specified positions on the surface of coarse aggregate, the surface of coarse aggregate becomes more uneven, increasing the surface roughness of coarse aggregate, improving the bonding strength between coarse aggregate and cement paste, thereby better improving the strength of UHPC and increasing the safety of the structure. Attached Figure Description

[0049] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1 This is a schematic diagram of the overall device of the present invention;

[0051] Figure 2 This is a schematic diagram of the primary cleaning component of the present invention;

[0052] Figure 3 This is a schematic diagram of the overall coating assembly of the present invention;

[0053] Figure 4 Details of the coating component of the present invention Figure 1 ;

[0054] Figure 5 Details of the coating component of the present invention Figure 2 ;

[0055] Figure 6 This is a schematic diagram of the demolding assembly of the present invention;

[0056] Figure 7 This is a schematic diagram of the secondary cleaning component of the present invention;

[0057] Figure 8 This is a schematic diagram of the reaction tank of the present invention;

[0058] Figure 9 This is a schematic diagram of the pre-drilled holes in the heat-shrinkable film of the present invention;

[0059] Figure 10 This is a schematic diagram of the coarse aggregate after coating according to the present invention;

[0060] Figure 11 This is a schematic diagram of the limiting plate of the present invention;

[0061] Figure 12 This is an electron microscope image of compressed concrete with the coarse aggregate surface untreated according to the present invention.

[0062] Figure 13 This is an electron microscope image of the concrete after compression following coarse aggregate surface treatment according to the present invention.

[0063] Figure 14 This invention provides a comparison of the compressive strength of concrete before and after coarse aggregate surface treatment.

[0064] Figure 15 This is a flowchart of the coarse aggregate processing steps of the present invention;

[0065] Explanation of reference numerals in the attached figures:

[0066] 1. Storage bin; 2. Conveyor belt; 3. Coarse aggregate; 4. High-pressure nozzle; 5. Multi-angle roller brush; 6. Hot air blower; 7. Heat shrink film; 8. Arched film-turning plate; 9. Modification tank; 10. Reaction tank; 11. Collection bin; 12. Signal line; 13. Controller; 14. Computer; 15. Drain hole; 16. Coarse aggregate after film coating; 17. Limiting plate; 18. Spring blade; 19. Roller; 20. Electricity 21. Motivation; 22. Heat-shrink film after shrinkage; 23. Probe; 24. Coarse aggregate after reaction; 15. Support; 1001. Outer wall of reaction tank; 1002. Drain box; 1003. Hydraulic lifting rod; 701. Hole-free area; 702. Reserved hole; 1601. Unreacted area; 1602. Reaction area; 1701. Fixing plate; 1702. Limiting spring; 1703. Inclined plate; 1704. Straight plate. Detailed Implementation

[0067] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0068] like Figure 1-14 As shown, the first aspect of the present invention provides a surface treatment device for coarse aggregate for ultra-high performance concrete, comprising: a storage tank 1, a primary cleaning component, a conveyor belt 2, a coating component, a modification tank 9, a demolding component, a reaction tank 10, a secondary cleaning component, an aggregate tank 11, and a signal acquisition and control component; wherein,

[0069] The storage bin 1 is used to store the coarse aggregate 3 to be processed and to convey it to the primary cleaning component;

[0070] The primary cleaning component is used to thoroughly clean the surface of the coarse aggregate 3 before the reaction, removing surface impurities and contaminants.

[0071] The coating assembly is used to cover the cleaned coarse aggregate 3 with heat shrink film 7 to form a protective layer.

[0072] The modification tank 9 is used to immerse the coated coarse aggregate 16 into the modification liquid, so that the parts that need to be modified come into contact with the modification liquid and react, while the unreacted area 1601 is protected by the heat shrink film 7.

[0073] The stripping assembly is used to cut the heat shrink film 7 covering the surface of the coarse aggregate 3 with a blade, and to recycle the heat shrink film 7 with two rollers 19, one above and one below, in preparation for the next step of entering the reaction tank 10.

[0074] The reaction tank 10 is used to immerse the demolded coarse aggregate 3, so that the solution in the reaction tank reacts with the coarse aggregate in the reaction zone.

[0075] The secondary cleaning component is used to perform secondary deep cleaning on the reacted coarse aggregate 23;

[0076] The aggregate bin 11 is used to collect the processed coarse aggregate 23 as raw material for the subsequent preparation of ultra-high performance concrete.

[0077] The signal acquisition and control component is used to monitor and automate the various process steps of the surface treatment of coarse aggregate 3.

[0078] The storage tank 1 has a discharge port for placing coarse aggregate 3 onto the conveyor belt 2 at the end of the primary cleaning component; the end of the primary cleaning component is used to transfer the coarse aggregate 3 onto the heat-shrinkable film 7 on the conveyor belt 2 at the end of the coating component; the modification tank 9 is located between the coating component and the stripping component; the reaction tank 10 is located between the stripping component and the secondary cleaning component; the collection tank 11 is located below the end of the conveyor belt 2 of the secondary cleaning component; and the signal acquisition and control component is communicatively connected to each component via signal line 12.

[0079] Furthermore, the primary cleaning component and the secondary cleaning component have the same structure, both including a primary spray zone, a deep cleaning zone, a secondary spray zone, a drain hole 15, and a hot air blower 6; the primary spray zone and the secondary spray zone include high-pressure nozzles 4; the deep cleaning zone includes a multi-angle roller brush 5; the multi-angle roller brush 5 includes cleaning brushes that rotate horizontally and vertically, used to automatically and thoroughly clean all surfaces of the coarse aggregate 3.

[0080] Furthermore, the coating assembly includes heat-shrink film 7, an arched film-turning plate 8, a limiting plate 17, and a hot air blower 6; the heat-shrink film 7 is provided with pre-drilled holes 702; the two sides of the arched film-turning plate 8 and the vertical side plates on both sides of the conveyor belt 2 are fixed, and the upper part is dome-shaped with a large entrance and a small exit; the conveyor belt 2 narrows at the arched film-turning plate 8; the heat-shrink film 7, which was originally laid flat on the conveyor belt 2, flips up on one side with the dome of the arched film-turning plate 8 after passing the arched film-turning plate 8, covering the coarse aggregate 3; the limiting plate 17 includes a fixing plate. 1701, limiting spring 1702, inclined plate 1703, and straight plate 1704; the fixing plate 1701 is fixed to the vertical side plates on both sides of the conveyor belt 2, the fixing plate 1701 is hinged to the inclined plate 1703 and connected by a spring, the spring provides a pushing force to the inclined plate 1703; the straight plate 1704 is fixedly connected to the inclined plate 1703 and is parallel to the vertical side plates on both sides of the conveyor belt 2; when the coarse aggregate 3 passes through the limiting plate 17, the limiting plate 17 uses spring pressure to tightly press the coarse aggregate 3 covered by the heat shrink film 7 against the inside of the heat shrink film 7.

[0081] The coarse aggregate 16 covered by the heat shrink film 7 passes through the hot air blowing zone. Under the action of the high temperature hot air blown out by the hot air blower 6, the heat shrink film 7 shrinks and tightly wraps and adheres to all the outer surfaces of the coarse aggregate 3.

[0082] After coating, the heat-shrinkable film 7 between the coarse aggregates 16 shrinks into a thinner rope-like shrink-shrinkable film 21, but does not break. The coated coarse aggregates 16 are connected together by the shrink-shrinkable film 21.

[0083] Furthermore, the modification tank 9 contains a modification liquid; the modification tank 9 is lower than the height of the conveyor belt 2 of the coating assembly; when the coated coarse aggregate 16 reaches the position of the modification tank 9, it will hang down and be completely immersed in the modification liquid. At this time, the reaction zone 1602 of the coated coarse aggregate 16 allows the surface of this part of the coarse aggregate 3 to directly contact the modification liquid and react through the reserved hole 702, while the unreacted zone 1601 is protected by the non-porous area 701 of the heat shrink film 7, so that the surface of the coarse aggregate 3 in the unreacted zone 1601 cannot contact the modification liquid and thus cannot react.

[0084] The materials of the modification tank 9 and the heat shrink film 7 do not react with the modification liquid.

[0085] Furthermore, the demolding assembly includes a limiting plate 17, a spring blade 18, a reel 19, and a motor 20; a blade is fixed on the straight plate 1704 of the limiting plate 17; the spring blade 18 is fixed on the vertical side plate of the conveyor belt 2, and the spring blade 18 can maintain contact with coarse aggregate 3 of different particle sizes by compression or extension; the spring blade 18 and the blade on the straight plate 1704 are located at the same height on both sides of the coarse aggregate 3, and the blade cuts the heat shrink film 7 covering the surface of the coarse aggregate 3 into upper and lower parts; there is a reel 19 at the upper and lower ends of the conveyor belt 2 of the demolding assembly, and the reel 19 is driven to rotate by the motor 20; the upper and lower reel 19 respectively retrieve the upper and lower parts of the heat shrink film 7 cut by the blade; the height of the conveyor belt 2 of the demolding assembly is higher than the upper edge of the reaction tank 10; the demolded coarse aggregate 3 is moved from between the upper and lower reel 19 into the reaction tank 10.

[0086] The roller 19, driven by the motor 20, rotates and retracts the cut heat-shrink film 7, pulling the coated coarse aggregate 16 from the reaction tank 10 onto the conveyor belt 2 of the decoction assembly, providing tension for the movement of the coated coarse aggregate 16 and the heat-shrink film 7.

[0087] Furthermore, the reaction tank 10 includes an outer wall 1001, a drain box 1002, and a hydraulic lifting rod 1003; the drain box 1002 is located in the reaction tank 10 and has a small hole at the bottom; the upper end of the hydraulic lifting rod 1003 is hinged to the vertical plates on both sides of the conveyor belt 2, and the lower end is hinged to the side wall of the drain box 1002.

[0088] Furthermore, the signal acquisition and control component includes a computer 14, a controller 13, a probe 22, and a signal line 12.

[0089] Furthermore, the end of the secondary cleaning component is equipped with a probe 22 for detecting the position, size, and shape of the silica generated on the surface of the coarse aggregate 23, and saving the data to the computer 14.

[0090] Furthermore, the working steps of the software module for the signal acquisition and control system of the surface treatment device for coarse aggregate in ultra-high performance concrete can be designed as follows:

[0091] S10. Obtain the process parameters input by the user, including coarse aggregate type, size range, expected output, modification requirements, etc.

[0092] S20. Based on the input parameters, consult the built-in database and set the initialization parameters of each component, such as the concentration of the modified liquid, the reaction temperature, and the reaction time.

[0093] S30. Issue a command to control the storage hopper to start releasing coarse aggregate onto the conveyor belt of the primary cleaning component;

[0094] S40. Based on the coarse aggregate flow rate, automatically control the opening time of the high-pressure nozzle, the spray pressure, the rotation speed of the multi-angle roller brush, and the air volume of the hot air blower of the primary cleaning component.

[0095] S50: Monitor the output status of coarse aggregate at the end of the conveyor belt of the primary cleaning component, and issue a command to control the coating component to start running;

[0096] S60. Control the position and tension of the heat shrink film during the covering and shrinking process according to the preset heat shrink film reserved hole parameters;

[0097] S70. Monitor the liquid level in the modification tank. When the coarse aggregate is in place after coating, control the liquid level in the modification tank to be raised so that it is immersed in the modification liquid.

[0098] S80. Based on the modification reaction time, control the opening of the drain port of the modification tank to end the modification reaction;

[0099] S90. Issue a command to control the operation of the heat shrink film removal component to complete the peeling and recycling of the heat shrink film;

[0100] S100. Monitor the liquid level in the reaction tank. When the coarse aggregate is in place after demolding, control the liquid level in the reaction tank to be raised so that it is immersed in the reaction liquid.

[0101] S110. According to the reaction time setting, control the reaction tank to start draining and end the reaction;

[0102] S120, drive the hydraulic lifting rod to lift the reacted coarse aggregate in the drain box to the secondary cleaning component;

[0103] S130, similar to S40, automatically controls each component of the secondary cleaning unit to thoroughly clean the coarse aggregate after the reaction.

[0104] S140. Obtain surface data of the coarse aggregate after reaction from the probe at the end of the secondary cleaning component and compare it with the preset qualification standard.

[0105] S150: Issue instructions to qualified post-reaction coarse aggregate and control its conveying to the collection hopper;

[0106] S160. For non-conforming items, initiate the feedback procedure, automatically adjust the relevant parameters, and return to S20 for reprocessing.

[0107] S170: Monitor the operating status of the device in real time, detect faults, and generate an operation log.

[0108] This software module enables automated control of the entire process of the equipment, greatly improving production efficiency and ensuring the stability and consistency of product quality. Simultaneously, through data feedback and automatic optimization, the production process can be continuously optimized to adapt to new application requirements.

[0109] like Figure 15 As shown, a second aspect of the present invention provides a method of using a surface treatment apparatus for coarse aggregate in ultra-high performance concrete, wherein, using the above-described surface treatment apparatus for coarse aggregate in ultra-high performance concrete, the method includes the following steps:

[0110] Step 1: The computer 14 controls the storage tank 1 to release the required coarse aggregate 3 onto the conveyor belt 2 of the primary cleaning component in sequence;

[0111] Step 2: Conveyor belt 2 transports coarse aggregate 3 to the primary spraying area of ​​the primary cleaning component. Computer 14 automatically controls nozzle 4 to spray distilled water onto the surface of coarse aggregate 3 to wash away dust and impurities on the surface of coarse aggregate 3.

[0112] Step 3: Coarse aggregate 3 is conveyed to the deep cleaning area, and multi-angle roller brush 5 cleans all parts of the surface of coarse aggregate 3.

[0113] Step 4: The coarse aggregate 3 is conveyed to the secondary spraying area of ​​the primary cleaning component, and the computer 14 automatically controls the nozzle 4 to thoroughly wash away the dust remaining on the surface of the coarse aggregate 3.

[0114] Step 5: Coarse aggregate 3 passes through the hot air drying zone of the primary cleaning component, where the hot air blower 6 dries the coarse aggregate 3 to completely remove moisture;

[0115] Step 6: The coarse aggregate 3 is conveyed to the covering area of ​​the coating assembly with heat shrink film 7 with different perforation shapes. The conveyor belt 2 port has an arched flipping plate 8. After passing through this point, the heat shrink film 7 automatically folds over and covers the coarse aggregate 3, completely covering the top and bottom of the coarse aggregate 3.

[0116] Step 7: When the coarse aggregate 3 passes the limiting plate 17, the limiting plate 17 uses spring pressure to press the coarse aggregate 16 covered by the heat shrink film 7 tightly against the inside of the heat shrink film 7.

[0117] Step 8: The coarse aggregate 16 covered by the heat shrink film 7 passes through the hot air blowing area. Under the action of the high temperature hot air blown out by the hot air blower 6, the heat shrink film 7 shrinks and tightly wraps and adheres to all the outer surfaces of the coarse aggregate 3.

[0118] Step 9: Immerse the coarse aggregate 16 covered by the heat-shrink film 7 in the silane coupling agent solution in the modification tank 9 to fully react with the reaction zone 1602 of the coarse aggregate 3;

[0119] Step 10: The coated coarse aggregate 16, which has been soaked in silane coupling agent solution, is conveyed to the heat shrink film dismantling area. The two sides of the film removal assembly are blade spring blade 18 with pressure spring and limit plate 17 with blade. The coarse aggregate 3 with heat shrink film 7 wrapped on the surface is cut open on both sides with blade. The upper and lower rollers 19 respectively collect the heat shrink film 7 cut by the blade.

[0120] Step 11: Immerse the demolded coarse aggregate 3 in the reaction tank 10 containing nano-silica solution, so that the reaction zone 1602 of the coarse aggregate 3 can fully adsorb nano-silica.

[0121] Step 12: Raise the hydraulic lifting rod 1003 of the drain box 1002 in the reaction tank 10, and pour the coarse aggregate 23 with adsorbed nano silica in the drain box 1002 into the primary spray area of ​​the secondary cleaning component to wash away the loose nano silica.

[0122] Step 13: Convey the rinsed post-reaction coarse aggregate 23 to the deep cleaning area, and use the multi-angle roller brush 5 to clean the surface of the post-reaction coarse aggregate 23.

[0123] Step 14: In the secondary spray zone of the secondary cleaning component, rinse the surface of the coarse aggregate 23 after the reaction again to ensure that the nano silica is firmly bonded in the reaction zone 1602 of the coarse aggregate 23.

[0124] Step 15: After cleaning and drying the reaction coarse aggregate 23, transport it to the collection bucket 11 for later use.

[0125] This ultra-high performance concrete coarse aggregate surface treatment device and its application method have outstanding effects, mainly reflected in the following aspects:

[0126] 1. Significantly improves the overall mechanical properties of concrete.

[0127] This device uses selective heat-shrinkable film coating technology to perform targeted modifications on different areas of the coarse aggregate surface, such as silane coupling agent modification. These modification measures enhance the interfacial bonding performance between the coarse aggregate and the cement paste, fundamentally solving the weak link of the "interface" in traditional concrete.

[0128] The strong adhesion between coarse aggregate and paste interface can significantly improve the compressive strength, flexural strength, tensile strength and other mechanical properties of concrete, meeting the stringent requirements of ultra-high performance concrete for mechanical properties.

[0129] 2. Achieve a fundamental improvement in concrete durability.

[0130] Poor interfacial bonding not only affects the mechanical properties of concrete but is also a key factor leading to durability problems such as leakage, spalling, and carbonation. Modifying the surface of coarse aggregate using this device can fundamentally improve the durability of concrete.

[0131] Taking nano-silica modification as an example, nano-silica particles impart a porous structure to the surface of coarse aggregates, which can block the penetration of harmful ions (such as chloride ions), thereby improving the chloride ion penetration resistance and corrosion resistance of concrete. At the same time, nano-silica can also significantly improve the density of concrete, reduce capillary channels, and block the penetration of harmful gases, thereby improving carbonation resistance.

[0132] 3. Automated control ensures consistent product quality.

[0133] The entire process of this device is automatically controlled by an integrated signal acquisition and control system, which greatly reduces interference from human operation and ensures the reliability of product quality and consistency between batches.

[0134] Meanwhile, the control system is also equipped with a feedback detection function, which can automatically optimize and adjust the process parameters according to the product quality, so that the device and method can continuously adapt to different raw materials and different usage environments, and ensure that high-performance modified coarse aggregate for concrete with excellent performance and stable quality can be produced under any conditions.

[0135] Two specific embodiments of the device of the present invention are provided below:

[0136] Example 1:

[0137] like Figure 1-14 As shown, this embodiment provides a surface treatment device for coarse aggregates for ultra-high performance concrete, including a storage tank 1, a primary cleaning component, a conveyor belt 2, a coating component, a modification tank 9, a demolding component, a reaction tank 10, a secondary cleaning component, an aggregate tank 11, and a signal acquisition and control component.

[0138] The storage hopper 1 is used to store the coarse aggregate 3 to be processed. The coarse aggregate 3 is placed onto the conveyor belt 2 at the end of the primary cleaning component through the discharge port. The primary cleaning component includes a primary spray zone (equipped with high-pressure nozzles 4), a deep cleaning zone (equipped with multi-angle roller brushes 5), a secondary spray zone (equipped with high-pressure nozzles 4), a drain hole 15, and a hot air blower 6, which are used to clean the coarse aggregate 3 before reaction and remove surface impurities and contaminants.

[0139] The coarse aggregate 3, after being cleaned by the cleaning component, is conveyed by the conveyor belt 2 to the coating component. The coating component includes a heat shrink film 7 with pre-drilled holes 702, an arched flipping plate 8, a limiting plate 17, and a hot air blower 6. After passing the arched flipping plate 8, the heat shrink film 7 automatically folds over and covers the coarse aggregate 3. The spring pressure of the limiting plate 17 presses the heat shrink film 7 tightly against the surface of the coarse aggregate 3 to form the coated coarse aggregate 16. Then, the hot air blower 6 blows high-temperature air to shrink the heat shrink film 7 and wrap it around the outer surface of the coarse aggregate 3.

[0140] After coating, the coarse aggregate 16 enters the downstream modification tank 9 and is immersed in the modification liquid. Since the heat shrink film 7 has reserved holes 702, the modification liquid can come into contact with the reaction zone 1602 of the coarse aggregate 3 to react, while the non-porous area 701 of the heat shrink film 7 can protect the unreacted area 1601 from contact with the modification liquid.

[0141] After modification, the coated coarse aggregate 16 enters the demolding assembly. The demolding assembly includes a limiting plate 17, a spring blade 18, upper and lower rollers 19, and a motor 20. The blades on the spring blade 18 and the limiting plate 17 cut the heat-shrink film 7, and the upper and lower rollers 19 collect the cut heat-shrink film 7, so that the demolded coarse aggregate 3 enters the downstream reaction tank 10.

[0142] The reaction tank 10 includes an outer wall 1001, a drain box 1002, and a hydraulic lifting rod 1003. After the coarse aggregate 3 has fully reacted with the reaction liquid in the reaction tank 10, the hydraulic lifting rod 1003 lifts the reacted coarse aggregate 23 in the drain box 1002 to the secondary cleaning component.

[0143] The secondary cleaning component is similar in structure to the primary cleaning component. It performs a secondary deep cleaning of the reacted coarse aggregate 23 and has a probe 22 at its end to detect the silica generated on the surface of the coarse aggregate 23. The data is saved to the computer 14. The cleaned coarse aggregate 23 is finally collected in the aggregate bin 11 and used as raw material for preparing ultra-high performance concrete.

[0144] The entire process is automatically monitored and controlled by signal acquisition and control components (including computer 14, controller 13, probe 22 and signal line 12).

[0145] Example 2:

[0146] This embodiment discloses a surface treatment device and its method for preparing coarse aggregate with nano-silica adjustment, so as to improve the bond strength between coarse aggregate and cement paste.

[0147] The device is as follows Figure 1-14As shown, it includes a storage tank 1, a primary cleaning component, a conveyor belt 2, a coating component, a modification tank 9 containing a silane coupling agent solution, a demolding component, a reaction tank 10 containing a nano-silica solution, a secondary cleaning component, a collection tank 11, and a signal acquisition and control component.

[0148] First, the coarse aggregate 3 enters the primary cleaning component from the storage tank 1, and is thoroughly cleaned by the high-pressure nozzle 4 in the primary spray zone, the multi-angle roller brush 5 in the deep cleaning zone, the high-pressure nozzle 4 in the secondary spray zone, and the hot air blower 6.

[0149] Afterwards, the cleaned coarse aggregate 3 enters the coating assembly. Here, the heat shrink film 7 with pre-drilled holes 702 is automatically folded over by the arched flipping plate 8 to cover the surface of the coarse aggregate 3, and the spring pressure of the limiting plate 17 presses the heat shrink film 7 tightly against the surface of the coarse aggregate 3. Finally, the hot air blower 6 shrinks the heat shrink film 7 to form the coated coarse aggregate 16.

[0150] Then, the coated coarse aggregate 16 enters the modification tank 9 and is immersed in the silane coupling agent solution. Due to the pre-reserved holes 702 on the heat-shrinkable film 7, the silane coupling agent solution can come into contact with the reaction zone 1602 of the coarse aggregate 3 and undergo a chemical reaction, while the non-porous zone 701 of the heat-shrinkable film 7 can protect the unreacted zone 1601 from being affected.

[0151] After modification, the coated coarse aggregate 16 enters the demolding assembly. The blades on the spring blade 18 and the limiting plate 17 cut the heat-shrink film 7, and the upper and lower rollers 19 collect the cut heat-shrink film 7, so that the demolded coarse aggregate 3 falls into the nano silica solution in the reaction tank 10.

[0152] In reaction tank 10, the reaction zone 1602 of coarse aggregate 3 reacts fully with the nano-silica solution and adsorbs the nano-silica. After the reaction is completed, the hydraulic lifting rod 1003 lifts the reacted coarse aggregate 23 in the drain box 1002 to the secondary cleaning component.

[0153] In the secondary cleaning component, the reacted coarse aggregate 23 is rinsed by high-pressure nozzles 4 in the primary spray zone, brushed by multi-angle rollers 5 in the deep cleaning zone, rinsed by high-pressure nozzles 4 in the secondary spray zone, and dried by hot air blower 6, so that the nano-silica adheres firmly to the surface of the reaction zone 1602 of the coarse aggregate 3. The probe 22 at the end of the secondary cleaning component detects the distribution of nano-silica on the surface of the coarse aggregate 23, and the data is saved to computer 14.

[0154] Finally, the coarse aggregate 23, which has adsorbed nano-silica, is collected in the aggregate bin 11 and can be used to prepare ultra-high performance concrete with excellent bonding properties. The entire process is automatically controlled by a signal acquisition and control component consisting of a computer 14, a controller 13, and other parts.

[0155] The specific steps for surface treatment of coarse aggregate 3 using the apparatus provided by the present invention are as follows:

[0156] Step 1: Raw material preparation

[0157] Collect the required amount of coarse aggregate 3 from a nearby quarry or production plant and store it in storage tank 1 for later use. According to the design requirements, select appropriate modifying liquid (such as silane coupling agent solution) and reaction liquid (such as nano silica solution) and inject them into modification tank 9 and reaction tank 10 respectively.

[0158] Step 2: Setting Process Parameters

[0159] The computer 14 in the signal acquisition and control component inputs relevant parameters for this processing, such as the type, size range, required output, and expected degree of modification of the coarse aggregate 3. The control system will automatically adjust the operating status of each component based on these parameters.

[0160] Step 3: Pre-treatment cleaning

[0161] Computer 14 controls the opening of the discharge port of storage tank 1, releasing coarse aggregate 3 sequentially onto the conveyor belt 2 of the primary cleaning component. The coarse aggregate 3 first enters the primary spray zone, where high-pressure nozzles 4 spray distilled water to preliminarily rinse its surface, removing visible dust and impurities.

[0162] Next, the coarse aggregate 3 passes through a deep cleaning zone, where a multi-angle roller brush 5 is installed, including cleaning brushes that can rotate horizontally and vertically, to thoroughly scrub every corner of the surface of the coarse aggregate 3. Then comes the secondary spray zone, where high-pressure nozzles 4 spray water again to rinse away any remaining dirt.

[0163] Finally, the coarse aggregate 3 enters the hot air drying zone, where a hot air blower 6 blows high-temperature air to completely dry it, removing any residual moisture. Drainage holes 15 in the primary cleaning assembly drain wastewater throughout the process.

[0164] Step 4: Cover with heat shrink film

[0165] The cleaned and dried coarse aggregate 3 is conveyed by conveyor belt 2 to the coating assembly. Here, heat shrink film 7 with pre-drilled holes 702 is prepared. The shape and size of the pre-drilled holes can be customized according to actual needs.

[0166] The heat shrink film 7 is first laid flat on the conveyor belt 2. When the coarse aggregate 3 is transported to the arched flipping plate 8, one side of the heat shrink film 7 will automatically fold over and cover the upper surface of the coarse aggregate 3 along with the "dome" shape of the arched flipping plate 8. At the same time, the inclined plate 1703 and the straight plate 1704 on the limiting plate 17 will press the heat shrink film 7 tightly under the action of the spring 1702, so that it is tightly attached to the side of the coarse aggregate 3.

[0167] Next, the coarse aggregate 16, which has been covered with heat shrink film 7, enters the hot air blowing area. The high temperature hot air blown out by the hot air blower 6 will cause the heat shrink film 7 to shrink, tighten and firmly cover the entire outer surface of the coarse aggregate 3, forming the coated coarse aggregate 16.

[0168] It is worth noting that, due to the presence of the pre-drilled holes 702 on the heat-shrink film 7, the surface area of ​​the coarse aggregate 3 corresponding to the pre-drilled holes 702 is still exposed during the process of the heat-shrink film 7 tightly wrapping the aggregate. This is the reaction zone 1602 where the reaction will occur later. Meanwhile, the surface of the coarse aggregate 3 covered by the non-porous area 701 of the heat-shrink film 7 is protected and becomes the unreacted area 1601.

[0169] Step 5: Modification reaction

[0170] After coating, the coarse aggregate 16 continues to be transported along the conveyor belt 2 and enters the modification tank 9. The modification tank 9 is filled with a modification liquid (such as a silane coupling agent solution). The liquid level in the modification tank 9 is set lower than the height of the conveyor belt 2 of the coating assembly, so when the coated coarse aggregate 16 arrives at the modification tank 9, it will naturally sag and be completely immersed in the modification liquid.

[0171] During the immersion process, due to the presence of the pre-reserved hole 702, the modified liquid can directly contact the reaction zone 1602 on the surface of the coarse aggregate 3, so that the required chemical reaction (such as the chemical bonding between the silane coupling agent and the surface of the coarse aggregate 3) can occur in this area.

[0172] The unreacted area 1601, covered and protected by the non-porous area 701 of the heat-shrinkable film 7, will not come into direct contact with the modifying liquid and therefore will not undergo a modification reaction, maintaining its original state. The materials of the modification tank 9 and the heat-shrinkable film 7 have been specially selected to ensure that they will not react or interfere with the modifying liquid.

[0173] After the modification reaction continues for a certain period of time, the coated coarse aggregate 16 is conveyed away from the modification tank 9 and enters the next process.

[0174] Step 6: Peel off the heat shrink film

[0175] After the modification reaction is completed, the coated coarse aggregate 16 enters the demolding assembly. This assembly includes a limiting plate 17, a spring blade 18, two upper and lower rollers 19, and a motor 20.

[0176] Spring blade 18 is fixed to the side plate of conveyor belt 2. It can maintain contact with coarse aggregate 3 of different particle sizes by spring compression or extension. Blades are fixed on the straight plate 1704 of spring blade 18 and limiting plate 17. These two sets of blades are located at the same height on both sides of coarse aggregate 3, which can simultaneously cut the heat shrink film 7 wrapped on the surface of coarse aggregate 3 into upper and lower parts.

[0177] Two rollers 19, one above the other, collect the upper and lower portions of the cut heat-shrink film 7. Driven by a motor 20, the rollers 19 simultaneously collect the heat-shrink film 7 and pull the demolded coarse aggregate 3 from the modification tank 9, conveying it to the conveyor belt 2 of the demolding assembly. This completes the demolding process, peeling the heat-shrink film 7 from the surface of the modified coarse aggregate 3.

[0178] Step 7: Secondary reaction

[0179] After demolding, the coarse aggregate 3 is conveyed by conveyor belt 2 to the reaction tank 10. The reaction tank 10 is filled with a reaction liquid, such as a nano-silica solution. The liquid level setting of the reaction tank 10 ensures that the coarse aggregate 3 is completely submerged in it.

[0180] Since the reaction zone 1602 on the surface of the coarse aggregate 3 is now fully exposed, it can directly contact the reaction liquid to undergo the required second-step chemical reaction. A drain box 1002 is provided at the bottom of the reaction tank 10, allowing the reaction liquid to be drained through a small hole at the bottom, thus controlling the reaction time.

[0181] After the reaction is completed, the hydraulic lifting rod 1003 in the reaction tank 10 is driven to lift the post-reaction coarse aggregate 23 in the drain box 1002 onto the conveyor belt 2 of the secondary cleaning component, in preparation for subsequent cleaning.

[0182] Step 8: Second cleaning

[0183] After the reaction, the coarse aggregate 23 undergoes the same cleaning process as the primary cleaning component in the secondary cleaning component: the high-pressure nozzle 4 in the primary spray zone performs a preliminary rinse, the multi-angle roller brush 5 in the deep cleaning zone brushes each surface, the high-pressure nozzle 4 in the secondary spray zone rinses again, and finally the hot air blower 6 dries it.

[0184] The difference is that the purpose of secondary cleaning is to thoroughly remove the reaction liquid remaining on the surface of the coarse aggregate 23 after the reaction, as well as some loose and unattached reaction products, to ensure that only the required modified materials (such as nano silica) are finally attached to the reaction zone 1602 of the coarse aggregate 3.

[0185] In addition, a probe 22 is provided at the end of the secondary cleaning component, which can detect the distribution of modified substances (such as silica) generated on the surface of the coarse aggregate 23 after the reaction, including position, shape, size, etc., and transmit the data to the computer 14 for archiving in real time.

[0186] Step 9: Product Collection

[0187] After a second thorough cleaning, the modified coarse aggregate 23 is finally collected in the aggregate bin 11 and can be used as a high-quality raw material for preparing ultra-high performance concrete.

[0188] This completes a full cycle of surface modification treatment for coarse aggregate 3. Through the sophisticated process of this device, a designated area 1602 on the surface of coarse aggregate 3 has been selectively modified with high-performance modifiers (such as silane coupling agents and nano-silica), which will significantly improve the interfacial bonding strength with cement paste in the future, thereby producing high-performance ultra-high-performance concrete.

[0189] It needs to be reiterated that the entire surface treatment process is automatically monitored and controlled by the computer 14, controller 13, probe 22 and other components of the signal acquisition and control component through the laid signal lines 12. There is little manual intervention, high efficiency and good product quality reliability.

[0190] This device integrates several innovative designs, such as selective heat-shrink film covering technology, dewatering box for controlling reaction time, and film cutting with blades in the film removal component. These features greatly improve the flexibility and applicability of the process, enabling personalized modification of various coarse aggregate materials and opening up new avenues for the development of ultra-high performance concrete.

[0191] The principles of this coarse aggregate surface treatment device and its application method for ultra-high performance concrete are explained below:

[0192] I. Device Principle:

[0193] 1. Multi-stage cleaning principle

[0194] The device employs a two-stage cleaning system: primary cleaning pre-treats and cleans the raw coarse aggregate to remove surface contaminants; secondary cleaning deeply cleans the modified coarse aggregate to remove residual reactants. This two-stage cleaning design maximizes the removal of interfering substances, creating an ideal environment for subsequent reactions and improving the modification effect.

[0195] 2. Selective Covering Principle of Heat Shrink Film

[0196] The key to the device is the use of heat-shrinkable film with pre-drilled holes, which can selectively cover certain areas of the coarse aggregate surface while exposing other areas requiring modification. The heat-shrinkable film shrinks and wraps securely, forming a good barrier between the modification liquid and the reaction liquid. This "masking-exposure" design allows for customized modification of different areas of the coarse aggregate surface.

[0197] 3. Stepwise modification principle

[0198] This device divides the surface modification of coarse aggregate into two reaction steps: the first step involves pre-treating the exposed area in a modification tank, such as reacting a silane coupling agent with the coarse aggregate to form chemical bonds; the second step further modifies the pre-treated area in the reaction tank, such as adsorbing nano-silica. This step-by-step modification maximizes the modification efficiency and effect.

[0199] 4. Membrane Demold Separation Principle

[0200] After modification, the heat shrink film needs to be removed. Here, an innovative removal method is adopted, which uses two sets of blades to cut the film and a reel to recycle it. This method can quickly and efficiently peel the heat shrink film off the surface of the modified coarse aggregate, preparing it for subsequent reactions.

[0201] II. Usage Method and Principle:

[0202] 1. Principle of regional modification

[0203] The fundamental principle behind using this device to modify the surface of coarse aggregate is to utilize the selective covering of a heat-shrinkable film to induce different chemical reactions in different areas of the coarse aggregate surface, thereby achieving customized modification by region. For example, pre-drilled holes allow certain areas to react with the modifying liquid, while other areas are protected by the heat-shrinkable film; then, after removing the film, the reaction zone is allowed to react with another reaction liquid.

[0204] 2. Interface Modification Principles

[0205] The purpose of this method is to improve the interfacial bond between coarse aggregate and cement paste, thereby enhancing the overall performance of concrete. By modifying the surface of coarse aggregate with silane coupling agents, nano-silica, etc., chemical bonds or nanostructures can be formed at the coarse aggregate-paste interface, enhancing the adhesion between the two phases.

[0206] 3. Principle of fine control

[0207] This method can precisely control the surface modification process of coarse aggregate from multiple perspectives, including modification reaction time (controlled by the drain box), modification area (pre-reserved holes in the heat shrink film), and degree of modification (concentration of the modifying liquid), so that the modification effect can be customized and is suitable for concrete needs in different application scenarios.

[0208] 4. Process Flow Principle

[0209] The method follows a strict multi-step process, including pretreatment cleaning, heat shrink film covering, modification pretreatment reaction, film removal and peeling, further modification reaction, and secondary cleaning. Each step has a clear purpose and is connected in an orderly manner, ensuring the efficiency and reliability of the entire modification process.

[0210] 5. Material compatibility principle

[0211] Throughout the process, the materials used in each component of the apparatus, as well as the selection of the modifying and reaction solutions, underwent repeated testing to ensure their compatibility during the modification process and to prevent side reactions that could affect the modification effect. This is a crucial guarantee for the feasibility and efficiency of this method.

[0212] In summary, the innovation of this device and its application method lies in the combination of advanced concepts such as heat shrink film shielding technology, stepwise modification strategy, and automated control, which enables precise regional selective modification of the surface of coarse aggregates, breaks the limitations of traditional modification methods, and opens up new avenues for the development of ultra-high performance concrete.

[0213] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A surface treatment device for coarse aggregate in ultra-high performance concrete, characterized in that, include: The system includes a storage hopper, a primary cleaning assembly, a conveyor belt, a coating assembly, a modification tank, a demolding assembly, a reaction tank, a secondary cleaning assembly, a collection hopper, and a signal acquisition and control assembly; among which, The storage hopper is used to store the coarse aggregate to be processed and to convey it to the primary cleaning unit; The primary cleaning component is used to thoroughly clean the surface of the coarse aggregate before the reaction, removing surface impurities and contaminants. The coating assembly is used to cover the cleaned coarse aggregate surface with heat shrink film to form a protective layer, and the heat shrink film is provided with reserved holes. The modification tank is used to immerse the coated coarse aggregate in the modification liquid, so that the parts that need to be modified come into contact with the modification liquid and react, while the unreacted areas are protected by the heat-shrink film. The stripping assembly is used to cut the heat-shrink film covering the surface of the coarse aggregate with a blade, and to recycle the heat-shrink film with two rollers, one above and one below, in preparation for the next step of entering the reaction tank. The reaction tank is used to immerse the coarse aggregate after demolding, so that the solution in the reaction tank reacts with the coarse aggregate in the reaction zone. The solution in the reaction tank is a nano-silica solution. The secondary cleaning component is used to perform secondary deep cleaning on the reacted coarse aggregate; The aggregate bin is used to collect the processed coarse aggregate, which will then be used as raw material for the subsequent preparation of ultra-high performance concrete. The signal acquisition and control component is used to monitor and automate the various processes involved in the surface treatment of coarse aggregate.

2. The surface treatment device for coarse aggregate in ultra-high performance concrete according to claim 1, characterized in that, The storage hopper has a discharge port for placing coarse aggregate onto the conveyor belt at the end of the primary cleaning component; the end of the primary cleaning component is used to transfer the coarse aggregate onto the heat-shrinkable film on the conveyor belt at the end of the coating component; the modification tank is located between the coating component and the stripping component; the reaction tank is located between the stripping component and the secondary cleaning component; the collection hopper is located below the end of the conveyor belt of the secondary cleaning component; the signal acquisition and control component is communicatively connected to each component via signal lines.

3. The surface treatment device for coarse aggregate in ultra-high performance concrete according to claim 2, characterized in that, The primary cleaning component and the secondary cleaning component have the same structure, both including a primary spray zone, a deep cleaning zone, a secondary spray zone, a drain hole, and a hot air blower; the primary spray zone and the secondary spray zone include high-pressure nozzles; the deep cleaning zone includes a multi-angle roller brush; the multi-angle roller brush includes cleaning brushes that rotate horizontally and vertically, used to automatically and thoroughly clean all surfaces of the coarse aggregate.

4. The surface treatment device for coarse aggregate in ultra-high performance concrete according to claim 3, characterized in that, The coating assembly includes heat-shrink film, an arched flipping plate, a limiting plate, and a hot air blower. The two sides of the arched flipping plate and the vertical side plates on both sides of the conveyor belt are fixed, and the upper part is dome-shaped with a large entrance and a small exit. The conveyor belt narrows at the arched flipping plate. The heat-shrink film, which was originally laid flat on the conveyor belt, flips up on one side with the dome of the arched flipping plate to cover the coarse aggregate after passing the arched flipping plate. The limiting plate includes a fixing plate, a limiting spring, an inclined plate, and a straight plate. The fixing plate is fixed to the vertical side plates on both sides of the conveyor belt. The fixing plate is hinged to the inclined plate and connected by a spring, which pushes the inclined plate. The straight plate is fixedly connected to the inclined plate and is parallel to the vertical side plates on both sides of the conveyor belt. When the coarse aggregate passes the limiting plate, the limiting plate uses spring pressure to tightly press the coarse aggregate covered by the heat-shrink film against the inside of the heat-shrink film.

5. The surface treatment device for coarse aggregate in ultra-high performance concrete according to claim 4, characterized in that, The modification tank contains a modification liquid; the modification tank is lower than the height of the conveyor belt of the coating assembly; when the coated coarse aggregate reaches the modification tank, it will droop downwards and be completely immersed in the modification liquid. At this time, the reaction zone of the coated coarse aggregate is directly in contact with the modification liquid and reacts through the reserved holes, while the unreacted zone is protected by the non-porous area of ​​the heat-shrinkable film, so that the surface of the coarse aggregate in the unreacted zone cannot come into contact with the modification liquid and thus cannot react.

6. The surface treatment device for coarse aggregate in ultra-high performance concrete according to claim 5, characterized in that, The demolding assembly includes a limiting plate, a spring blade, a reel, and a motor. A blade is fixed to the straight plate of the limiting plate. The spring blade is fixed to the vertical side plate of the conveyor belt, and the spring, through compression or extension, allows the spring blade to maintain contact with coarse aggregates of different particle sizes. The spring blade and the blade on the straight plate are located at the same height on both sides of the coarse aggregate, cutting the heat-shrink film covering the surface of the coarse aggregate into upper and lower parts. The conveyor belt of the demolding assembly has a reel at the top and bottom, respectively, driven by a motor. The upper and lower reels respectively retrieve the upper and lower parts of the heat-shrink film cut by the blade. The height of the conveyor belt of the demolding assembly is higher than the upper edge of the reaction tank. The demolded coarse aggregate is moved from between the upper and lower reels into the reaction tank.

7. The surface treatment device for coarse aggregate in ultra-high performance concrete according to claim 6, characterized in that, The reaction tank includes an outer wall, a drain box, and a hydraulic lifting rod; the drain box is located in the reaction tank and has a small hole at the bottom; the upper end of the hydraulic lifting rod is hinged to the vertical plates on both sides of the conveyor belt, and the lower end is hinged to the side wall of the drain box.

8. The surface treatment device for coarse aggregate in ultra-high performance concrete according to claim 7, characterized in that, The signal acquisition and control components include a computer, a controller, a probe, and signal lines.

9. The surface treatment device for coarse aggregate in ultra-high performance concrete according to claim 8, characterized in that, The end of the secondary cleaning component is equipped with a probe for detecting the position, size, and shape of silica generated on the surface of coarse aggregate, and saving the data to the computer.

10. A method of using a surface treatment device for coarse aggregate in ultra-high performance concrete, characterized in that, The method using the coarse aggregate surface treatment apparatus for ultra-high performance concrete according to any one of claims 1-9 includes the following steps: Step 1: The storage hopper is controlled by a computer to release the required coarse aggregates sequentially onto the conveyor belt of the primary cleaning component; Step 2: The conveyor belt transports the coarse aggregate to the primary spraying area of ​​the primary cleaning component. The computer automatically controls the nozzles to spray distilled water onto the surface of the coarse aggregate to wash away dust and impurities. Step 3: The coarse aggregate is transported to the deep cleaning area, and multi-angle roller brushes clean all parts of the surface of the coarse aggregate. Step 4: The coarse aggregate is conveyed to the secondary spraying area of ​​the primary cleaning component, where the computer automatically controls the spray nozzles to thoroughly wash away the dust remaining on the surface of the coarse aggregate. Step 5: The coarse aggregate passes through the hot air drying zone of the primary cleaning component, where a hot air blower dries the coarse aggregate to completely remove moisture; Step 6: The coarse aggregate is conveyed to the covering area of ​​the coating assembly with heat shrink film of different perforated shapes. The conveyor belt port has an arched flipping plate. After passing through this point, the heat shrink film automatically folds over and covers the coarse aggregate, completely covering the top and bottom of the coarse aggregate. Step 7: When the coarse aggregate passes the limiting plate, the limiting plate uses spring pressure to keep the coarse aggregate covered by the heat shrink film tightly against the inside of the heat shrink film. Step 8: The coarse aggregate covered with heat shrink film passes through the hot air blowing area. Under the action of the high temperature hot air blown out by the hot air blower, the heat shrink film shrinks and tightly wraps and adheres to all the outer surfaces of the coarse aggregate. Step 9: Immerse the coarse aggregate covered with heat-shrink film in the silane coupling agent solution in the modification tank to fully react with the reaction zone of the coarse aggregate; Step 10: The coated coarse aggregate, which has been soaked in silane coupling agent solution, is conveyed to the heat shrink film dismantling area. The two sides of the film removal assembly are blades with pressure springs and limit plates with blades. The coarse aggregate covered with heat shrink film is cut open on both sides by the blades, and the upper and lower rollers respectively collect the heat shrink film cut by the blades. Step 11: Immerse the demolded coarse aggregate in a reaction tank containing a nano-silica solution to allow the reaction zone of the coarse aggregate to fully adsorb the nano-silica. Step 12: Raise the hydraulic lifting rod of the drain box in the reaction tank, and pour the coarse aggregate with adsorbed nano-silica in the drain box into the primary spray area of ​​the secondary cleaning component to wash away the loose nano-silica. Step 13: Convey the rinsed post-reaction coarse aggregate to the deep cleaning area, and use a multi-angle roller brush to clean the surface of the post-reaction coarse aggregate. Step 14: In the secondary spray zone of the secondary cleaning component, rinse the surface of the coarse aggregate after the reaction again to ensure that the nano silica is firmly bonded to the reaction zone of the coarse aggregate. Step 15: After cleaning, dry the reacted coarse aggregate and transport it to the collection hopper for later use.

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