Recycled concrete and preparation method thereof

Abstract

The invention relates to the field of recycled concrete, in particular to recycled concrete and a preparation method thereof. A recycled concrete preparation method comprises the steps that S1, damaged concrete on a road surface is shoveled up through a shoveling plate, a vibrating screen is used for screening the concrete, and soil and sundries mixed in the concrete are removed; s2, the pretreated concrete is conveyed to a jaw crusher for primary crushing, and then secondary crushing is conducted through a cone crusher; s3, putting the recycled coarse aggregate into a drum-type mixer, adding a nano silicon dioxide solution, and stirring, so as to enhance the strength of the aggregate; s5, the recycled coarse aggregate, the sand and the cement are put into the forced mixer, and dry mixing is carried out for 1-2 minutes; adding 70% of mixing water, and stirring for 2-3 minutes; and then adding the water reducing agent and the residual mixing water, and stirring for 3-5 minutes. The recycled concrete comprises recycled coarse aggregate; natural sand; cement; coal ash; water; a water reducing agent; and a nano silicon dioxide solution.

Description

Technical Field

[0001] The present invention relates to the field of recycled concrete, and more particularly to recycled concrete and a preparation method thereof. Background Art

[0002] With the acceleration of urbanization and the continuous advancement of infrastructure construction, the production and use of concrete, as the largest-volume man-made building material, continues to expand. At the same time, during the service life of infrastructure such as roads and bridges, the concrete structures are damaged due to factors such as natural aging, traffic loads, and environmental erosion, resulting in a large amount of waste concrete. At present, processing waste concrete into recycled aggregate for the preparation of recycled concrete has become an important way to realize the resource utilization of waste concrete. However, in actual engineering applications, the existing technology faces many difficulties. Since the damaged concrete of the road surface is tightly bonded to the base layer, and is affected by the road structure and construction technology, traditional demolition equipment and construction methods are not easy to shovel and separate the damaged concrete, which hinders the promotion and application of recycled concrete technology. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, the present invention provides a recycled concrete and a preparation method thereof, which has the beneficial effect that the damaged concrete on the road surface can be shoveled up with a shovel and the damaged concrete can be used to make recycled concrete.

[0004] A recycled concrete preparation device includes a seat block, one side of the seat block is provided with an arc angle, the upper side of the seat block is provided with a swivel seat, the swivel seat is provided with a slide groove, a shovel plate is slidably connected to the slide groove, and the shovel plate rests on the arc angle.

[0005] The front and rear ends of the swivel seat are respectively connected to the upper parts of the two lifting rods through shaft rotation. The two lifting rods are vertically slidably connected to the seat block. A telescopic rod 2 is fixed on the lifting rod, and the movable end of the telescopic rod 2 is fixed on the seat block.

[0006] A flat head is integrally formed on the upper portion of the shovel plate, and a vertical block is integrally formed on one side of the flat head, wherein the vertical block is perpendicular to the flat head.

[0007] The front and rear ends of the seat block are fixed with fixed sleeves, and the two flat rods are respectively slidably connected to the two fixed sleeves. The two ends of the rotating wheel are respectively connected to the left parts of the two flat rods through shaft rotation. The rotating wheel is pressed on the left side of the shovel plate. Two telescopic rods three are fixed on the right side of the seat block, and the right ends of the two telescopic rods three are respectively fixed to the right ends of the two flat rods.

[0008] A method for preparing recycled concrete comprises the following steps:

[0009] S1: Use a shovel to scoop up the damaged concrete on the road surface, and use a vibrating screen to screen the concrete to remove mixed soil and debris;

[0010] S2: The pre-treated concrete is transported to the jaw crusher for primary crushing, and then to the cone crusher for secondary crushing;

[0011] S3: Place the recycled coarse aggregate into a drum mixer and add nano-silica solution to stir to enhance the strength of the aggregate;

[0012] S5: First, add recycled coarse aggregate, sand and cement into the forced mixer and dry mix for 1-2 minutes; then add 70% of the mixing water and mix for 2-3 minutes; then add the water reducer and the remaining mixing water and mix for another 3-5 minutes; after mixing, discharge the concrete and cast it into shape.

[0013] The invention discloses a recycled concrete, which is composed of the following raw materials in parts by weight: recycled coarse aggregate: 600-800 parts; natural sand: 400-500 parts; cement: 280-350 parts; fly ash: 60-80 parts; water: 150-180 parts; water reducing agent: 3-5 parts; and nano-silicon dioxide solution: 10-20 parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0015] Figure 1 A schematic diagram of the structure of a recycled concrete preparation device Figure 1 ;

[0016] Figure 2 A schematic diagram of the structure of a recycled concrete preparation device Figure 2 ;

[0017] Figure 3 A schematic diagram of the structure of a recycled concrete preparation device Figure 3 ;

[0018] Figure 4 Schematic diagram of the structure of the seat block, swivel seat and rotating wheel Figure 1 ;

[0019] Figure 5 Schematic diagram of the structure of the seat block;

[0020] Figure 6 Schematic diagram of the structure of the seat block, swivel seat and rotating wheel Figure 2 ;

[0021] Figure 7 Schematic diagram of the shovel structure Figure 1 ;

[0022] Figure 8 Schematic diagram of the shovel structure Figure 2 ;

[0023] Figure 9 It is a structural diagram of the wheel seat;

[0024] Figure 10 Schematic diagram of the structure of the additional seat Figure 1 ;

[0025] Figure 11 Schematic diagram of the structure of the additional seat Figure 2 ;

[0026] In the figure: seat block 101; arc angle 102; L-shaped frame 103; protruding piece 104; stop pin 105; telescopic rod 106; protruding point 107; connecting seat 108; socket 109;

[0027] Rotating seat 201; slide 202; telescopic rod 203; lifting rod 204;

[0028] Rotating wheel 301; annular groove 302; flat rod 303; telescopic rod 304; fixed sleeve 305;

[0029] Shovel plate 401; flat head 402; vertical block 403; ridge 404;

[0030] Wheel seat 501; sliding hole 502; wheel 503;

[0031] Additional seat 601; telescopic rod 602; anti-slip edge 603; weight block 604; protruding rod 605; lifting frame 606; pressure rod 607; insertion rod 608. DETAILED DESCRIPTION

[0032] like Figure 4-8 As shown;

[0033] Since the recycled concrete preparation device includes a seat block 101, an arc angle 102 is provided on one side of the seat block 101, a swivel seat 201 is provided on the upper side of the seat block 101, and a slide groove 202 is provided on the swivel seat 201, and a shovel plate 401 is slidably connected to the slide groove 202, and the shovel plate 401 is placed on the arc angle 102. The seat block 101 is placed on the ground, and then the lower end of the shovel plate 401 is obliquely pressed against the damaged concrete on the road surface, and then a hammer is used to hammer the upper end of the shovel plate 401. The lower end of the shovel plate 401 is blade-shaped, and the shovel plate 401 slides obliquely downward along the slide groove 202. At this time, the lower end of the shovel plate 401 is shoveled into the damaged concrete, which makes it convenient to shovel up the damaged concrete and use the damaged concrete to manufacture recycled concrete. The arc angle 102 can provide support for the shovel plate 401. The shovel plate 401 is supported at two locations by the swivel seat 201 and the arc angle 102, so that the shovel plate 401 is more stable when moving and is easier to shovel into the concrete stably.

[0034] Furthermore, a micro-vibration motor is integrated within blade 401. When hammering blade 401, the vibration mode can be activated via the control panel. The vibration frequency can be adjusted between 50-200Hz. This high-frequency vibration creates resonance between blade 401 and the concrete, effectively reducing the concrete's cohesive force and easing the crushing process. This is particularly suitable for older, stronger concrete structures.

[0035] Furthermore, the device's surface is sprayed with a nano-level anti-stick coating to prevent concrete debris from adhering. After operation, an external water source can be connected to activate the device's internal high-pressure flushing system, automatically cleaning areas prone to material accumulation, such as the shovel plate 401 and chute 202. Furthermore, key metal components are constructed of stainless steel and equipped with an automatic anti-rust oil sprayer, ensuring regular rust prevention and extending the device's service life.

[0036] like Figure 4-6 As shown;

[0037] Since the front and rear ends of the swivel seat 201 are respectively connected to the upper parts of the two lifting rods 204 through shaft rotation, the two lifting rods 204 are vertically slidably connected to the seat block 101, and a telescopic rod 203 is fixed on the lifting rod 204. The movable end of the telescopic rod 203 is fixed on the seat block 101. When the two telescopic rods 203 are extended or retracted, the two lifting rods 204 are driven to slide vertically on the seat block 101, thereby driving the swivel seat 201 to rise or fall. Since the shovel plate 401 is always placed on the arc angle 102, the angle of the shovel plate 401 can be adjusted by raising or lowering the swivel seat 201. When the concrete is thicker, the shovel plate 401 is adjusted to a steeper state to facilitate the shovel plate 401 to shovel into thicker concrete. When the concrete is thinner, the shovel plate 401 is adjusted to a gentler state to facilitate the shovel plate 401 to shovel into a larger area of ​​concrete. When the shovel plate 401 is inserted into the concrete, the lower end insertion portion of the shovel plate 401 is rotated and lifted, thereby lifting the damaged concrete, making it easier for the damaged concrete to leave the ground.

[0038] Furthermore, a laser rangefinder has been added to the side of blade 401 to measure the depth of its penetration into the concrete in real time. The crushing depth is preset via the control panel. When the laser rangefinder detects that the blade has reached the preset depth, the system automatically limits the travel of telescopic rod 203 to prevent excessive penetration and damage to the base layer. Simultaneously, this depth data is displayed on a smart terminal, allowing operators to monitor the progress of the operation in real time.

[0039] like Figure 7-8 As shown;

[0040] Since the upper part of the shovel plate 401 is integrally formed with a flat head 402, and one side of the flat head 402 is integrally formed with a vertical block 403, and the vertical block 403 is perpendicular to the flat head 402, after adjusting the shovel plate 401 to a suitable angle, the shovel plate 401 can be shoveled into the concrete by hammering the flat head 402, and then the lower end insertion part of the shovel plate 401 can be driven to rotate and lift by hammering the vertical block 403, thereby lifting the damaged concrete.

[0041] like Figure 6 As shown;

[0042] Since the front and rear ends of the seat block 101 are fixed with fixed sleeves 305, the two flat rods 303 are respectively slidably connected to the two fixed sleeves 305, and the two ends of the rotating wheel 301 are respectively connected to the left part of the two flat rods 303 through shaft rotation. The rotating wheel 301 is pressed on the left side of the shovel plate 401. Two telescopic rods 304 are fixed on the right side of the seat block 101. The right ends of the two telescopic rods 304 are respectively fixed to the right ends of the two flat rods 303. When the two telescopic rods 304 are extended or retracted, they can drive the two flat rods 303 to move. The rod 303 slides on the two fixed sleeves 305 respectively, thereby driving the wheel 301 to move closer to or away from the shovel board 401. When the shovel board 401 shovels into the concrete, the wheel 301 is pressed on the shovel board 401, thereby preventing the shovel board 401 from leaving the arc angle 102, making the shovel board 401 more stable when moving. When the shovel board 401 needs to be lifted to lift the concrete, the wheel 301 moves to the left and away from the shovel board 401, thereby avoiding affecting the rotation and lifting of the shovel board 401.

[0043] like Figure 4-8 As shown;

[0044] Since a ridge 404 is integrally formed in the middle of the shovel plate 401 and an annular groove 302 is provided in the middle of the runner 301, the ridge 404 is inserted into the annular groove 302. When the runner 301 is pressed onto the shovel plate 401, the ridge 404 is inserted into the annular groove 302. By inserting the ridge 404 into the annular groove 302, the shovel plate 401 is prevented from moving relative to the seat block 101, making the shovel plate 401 more stable when shoveling into concrete.

[0045] like Figure 4-6 and 9;

[0046] Since the front and rear sides of the seat block 101 are fixed with convex pieces 104, the two wheel seats 501 are arranged front and back, and the wheel seats 501 are provided with sliding holes 502. The wheel seats 501 are slidably connected to the convex pieces 104 through the sliding holes 502. A stop pin 105 is inserted into the convex piece 104. The stop pin 105 blocks the outer side of the wheel seat 501. The lower part of the wheel seat 501 is rotatably connected to two wheels 503. The front and rear ends of the upper side of the seat block 101 are fixed with L-shaped frames 103, and each L-shaped frame 103 is fixed with a telescopic rod 106. The ends of the two telescopic rods 106 are respectively fixed on the two wheel seats 501. The telescopic rod 106 is fixed to the front and rear ends of the two wheel seats 501. When 106 is extended or retracted, it can drive the corresponding wheel seat 501 to slide on the corresponding protrusion 104 through the sliding hole 502 thereon, thereby driving the wheel seat 501 and the wheel 503 thereon to rise and fall. The stop pin 105 can prevent the wheel seat 501 from separating from the protrusion 104. When the position of the seat block 101 needs to be moved, the wheel seat 501 and the wheel 503 are moved downward relative to the seat block 101, so that the four wheels 503 support the seat block 101, and then the seat block 101 can be moved to other positions through the wheels 503, which makes it convenient to move the shovel plate 401 to other positions and shovel concrete at different positions.

[0047] like Figure 4-6 and 10-11;

[0048] Since the right side of the seat block 101 is fixed with a connecting seat 108, the connecting seat 108 is provided with two sockets 109, the left portion of the additional seat 601 is L-shaped, and two plug rods 608 are fixed to the lower side of the left portion of the additional seat 601. The two plug rods 608 are respectively inserted into the two sockets 109. The lower side of the seat block 101 is evenly distributed with a plurality of convex points 107, and the lower side of the additional seat 601 is evenly distributed with a plurality of anti-slip edges 603. The upper side of the additional seat 601 is fixed with a convex rod 605, and the middle part of a plurality of weights 604 is inserted into the convex rod 605. Due to the large force when hammering the shovel plate 401, the seat block 101 and the additional seat 601 are connected through the connecting seat 108 and the insertion rod 608, and then multiple weight blocks 604 are inserted into the protruding rod 605 as needed to weight the additional seat 601. The weight of the additional seat 601 is applied to the seat block 101, and then the multiple protrusions 107 on the lower side of the seat block 101 contact the ground, and the multiple anti-slip edges 603 on the lower side of the additional seat 601 contact the ground to prevent the seat block 101 from moving relative to the ground when the shovel plate 401 is hammered, so that greater force can be applied to the shovel plate 401, so that the shovel plate 401 can be shoveled into harder concrete.

[0049] Furthermore, standardized interfaces are reserved on the right side of the attachment base 601 for quick connection to various functional modules. For example, the dust collection module, through its built-in exhaust fan and filtration system, simultaneously absorbs dust raised by the scraper 401 during operation, improving the working environment; the lighting module provides multi-angle lighting to ensure safe operation at night or in low-light environments; and the data acquisition module monitors device operating data in real time and uploads it to the cloud for remote management and fault warning.

[0050] like Figure 7-8 and 10-11;

[0051] The additional seat 601 is vertically slidably connected to a lifting frame 606, and two horizontal pressure rods 607 are fixed on the upper part of the lifting frame 606, and the two pressure rods 607 are both located above the flat head 402. A telescopic rod four 602 is fixed on the additional seat 601, and the end of the telescopic rod four 602 is fixed to the lifting frame 606. The lifting frame 606 and the two pressure rods 607 can be driven to rise and fall by the telescopic rod four 602. When the shovel plate 401 is shoveled into the concrete, the lifting frame 606 and the two pressure rods 607 move downward, so that the two pressure rods 607 are pressed on the flat head 402 on the shovel plate 401, and the weight of the additional seat 601 and the weight block 604 thereon is applied to the shovel plate 401. At this time, when the vertical block 403 is hammered upward, the shovel plate 401 can be easily lifted, which makes it convenient to lift up the damaged concrete for utilization and to produce recycled concrete.

[0052] Furthermore, a high-frequency vibration device is embedded within the compression rod 607, with a frequency that can be infinitely adjusted within a range of 30-150Hz. When the compression rod applies pressure to the blade, the vibration function is simultaneously activated, utilizing resonance to reduce the cohesive force of the concrete. Combined with the hammering action, this "combination of pressure and vibration" increases the crushing efficiency of hard concrete by over 50%, making it particularly suitable for demolition of high-grade concrete, such as bridges and airport runways.

[0053] A method for preparing recycled concrete comprises the following steps:

[0054] S1: Use a shovel to scoop up the damaged concrete on the road surface, and use a vibrating screen to screen the concrete to remove mixed soil and debris;

[0055] S2: The pre-treated concrete is transported to the jaw crusher for primary crushing, and then to the cone crusher for secondary crushing;

[0056] S3: Place the recycled coarse aggregate into a drum mixer and add nano-silica solution to stir to enhance the strength of the aggregate;

[0057] S5: First, add recycled coarse aggregate, sand and cement into the forced mixer and dry mix for 1 minute; then add 70% of the mixing water and mix for 2 minutes; then add the water reducer and the remaining mixing water and mix for another 3 minutes; after the mixing is completed, the concrete is discharged and poured into shape.

[0058] Disclosed is a recycled concrete composed of the following raw materials in parts by weight: 600 parts of recycled coarse aggregate; 400 parts of natural sand; 280 parts of cement; 60 parts of fly ash; 150 parts of water; 3 parts of water reducing agent; and 10 parts of nano-silicon dioxide solution.

Claims

1. A recycled concrete preparation device, comprising a block (101), characterized in that: An arc angle (102) is provided on one side of the seat block (101), a rotating seat (201) is provided on the upper side of the seat block (101), a sliding groove (202) is provided on the rotating seat (201), a shovel plate (401) is slidably connected to the sliding groove (202), and the shovel plate (401) is placed on the arc angle (102).

2. The recycled concrete preparation device according to claim 1, characterized in that: The front and rear ends of the rotating seat (201) are respectively connected to the upper parts of two lifting rods (204) through shaft rotation. The two lifting rods (204) are vertically slidably connected to the seat block (101). A second telescopic rod (203) is fixed on the lifting rod (204), and the movable end of the second telescopic rod (203) is fixed on the seat block (101).

3. The recycled concrete preparation device according to claim 2, characterized in that: A flat head (402) is integrally formed on the upper portion of the shovel plate (401), and a vertical block (403) is integrally formed on one side of the flat head (402), wherein the vertical block (403) is perpendicular to the flat head (402).

4. The recycled concrete preparation device according to claim 3, characterized in that: The front and rear ends of the seat block (101) are both fixed with fixed sleeves (305), the two flat rods (303) are respectively slidably connected to the two fixed sleeves (305), the two ends of the rotating wheel (301) are respectively connected to the left parts of the two flat rods (303) through shaft rotation, the rotating wheel (301) is pressed on the left side of the shovel plate (401), and two telescopic rods (304) are fixed on the right side of the seat block (101), and the right ends of the two telescopic rods (304) are respectively fixed to the right ends of the two flat rods (303).

5. The recycled concrete preparation device according to claim 4, characterized in that: A ridge (404) is integrally formed in the middle of the shovel plate (401), and an annular groove (302) is provided in the middle of the rotating wheel (301), and the ridge (404) is inserted into the annular groove (302).

6. The recycled concrete preparation device according to claim 5, characterized in that: The front and rear sides of the seat block (101) are both fixed with convex pieces (104), two wheel seats (501) are arranged front and rear, and a sliding hole (502) is provided on the wheel seat (501), and the wheel seat (501) is slidably connected to the convex piece (104) through the sliding hole (502), and a stop pin (105) is inserted into the convex piece (104), and the stop pin (105) is blocked on the outside of the wheel seat (501), and the lower part of the wheel seat (501) is rotatably connected to two wheels (503), and the front and rear ends of the upper side of the seat block (101) are both fixed with L-shaped frames (103), and each L-shaped frame (103) is fixed with a telescopic rod (106), and the ends of the two telescopic rods (106) are respectively fixed to the two wheel seats (501).

7. The recycled concrete preparation device according to claim 6, characterized in that: A connecting seat (108) is fixed on the right side of the seat block (101), and two insertion holes (109) are provided on the connecting seat (108). The left part of the additional seat (601) is L-shaped. Two insertion rods (608) are fixed on the lower side of the left part of the additional seat (601), and the two insertion rods (608) are respectively inserted into the two insertion holes (109). The lower side of the seat block (101) is evenly distributed with a plurality of protrusions (107), and the lower side of the additional seat (601) is evenly distributed with a plurality of anti-slip edges (603). A protruding rod (605) is fixed on the upper side of the additional seat (601), and the middle parts of the plurality of weight blocks (604) are inserted into the protruding rod (605).

8. The recycled concrete preparation device according to claim 7, characterized in that: The additional seat (601) is vertically slidably connected to a lifting frame (606), and two horizontal pressure rods (607) are fixed on the upper part of the lifting frame (606). The two pressure rods (607) are both located above the flat head (402). A telescopic rod four (602) is fixed on the additional seat (601), and the end of the telescopic rod four (602) is fixed on the lifting frame (606).

9. A method for preparing recycled concrete, characterized in that: The following steps are involved: S1: Use a shovel to scoop up the damaged concrete on the road surface, and use a vibrating screen to screen the concrete to remove mixed soil and debris; S2: The pre-treated concrete is transported to the jaw crusher for primary crushing, and then to the cone crusher for secondary crushing; S3: Place the recycled coarse aggregate into a drum mixer and add nano-silica solution to stir to enhance the strength of the aggregate; S5: First, add recycled coarse aggregate, sand and cement into the forced mixer and dry mix for 1-2 minutes; then add 70% of the mixing water and mix for 2-3 minutes; then add the water reducer and the remaining mixing water and mix for another 3-5 minutes; after mixing, discharge the concrete and cast it into shape.

10. A recycled concrete, characterized in that: The recycled concrete is composed of the following raw materials in parts by weight: recycled coarse aggregate: 600-800 parts; natural sand: 400-500 parts; cement: 280-350 parts; fly ash: 60-80 parts; water: 150-180 parts; water reducing agent: 3-5 parts; and nano silicon dioxide solution: 10-20 parts.

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