A method for preparing ultra-high performance concrete using recycled aggregate from construction waste

Abstract

The invention discloses a method for preparing ultra-high performance concrete by using recycled aggregate from construction waste in the technical field of concrete preparation: step one: pre-treating construction waste, including hammering and crushing the discarded concrete, and then selecting metal and steel bars therein through a magnetic sorting device; step two: preparing the recycled aggregate again, crushing it through a jaw crusher, screening out fine particles below 5 mm, and obtaining particles of 5-40 mm; then using an eccentric rotating device to collide and grind it, remove mortar and cement slurry, and thus obtain recycled aggregate; step three: then, according to the physical and mechanical properties of the recycled aggregate, combined with engineering requirements and use environment, designing a reasonable concrete mix ratio; since the recycled aggregate has a large water absorption, the water-cement ratio in the concrete should be appropriately increased; the invention can greatly improve the sorting efficiency of metals in concrete.

Description

Technical Field

[0001] The invention relates to the technical field of concrete preparation, and in particular to a method for preparing ultra-high performance concrete by utilizing recycled aggregate from construction waste. Background Art

[0002] The use of recycled aggregates from construction waste to prepare ultra-high performance concrete (UHPC) is an environmentally friendly and resource-efficient process; since there are a lot of metals and steel bars in construction waste, if they are not removed, it will affect the performance of the concrete and the quality of the final product.

[0003] In the existing practice, magnetic sorting is usually used to remove metal materials such as steel bars from construction waste. During the sorting, a large amount of construction waste is often put into the sorting equipment, and the steel bars and other metals are adsorbed on the magnetic parts in the sorting equipment. As the steel bars and other metals continue to accumulate, the broken waste concrete blocks will cause the metal that is not tightly adsorbed on the outer layer to fall off when they hit the adsorbed steel bars and other metals. At this time, the equipment needs to be shut down to take out the steel bars and other metal materials before continuing the sorting, and the sorting efficiency is low. Summary of the invention

[0004] The object of the present invention is to provide a method for preparing ultra-high performance concrete using recycled aggregate from construction waste, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a method for preparing ultra-high performance concrete using recycled aggregate from construction waste, the method comprising the following steps:

[0006] Step 1: Pre-processing of construction waste, including crushing the discarded concrete by hammering, and then selecting the metal and steel bars through a magnetic sorting device;

[0007] Step 2: Prepare the recycled aggregate, crush it with a jaw crusher, remove fine particles below 5mm, and obtain particles of 5-40mm; then use an eccentric rotating device to collide and grind it, remove mortar and cement slurry, and thus obtain recycled aggregate;

[0008] Step 3: Then, according to the physical and mechanical properties of recycled aggregates, combined with engineering requirements and use environment, design a reasonable concrete mix ratio; since recycled aggregates have great water absorption, the water-cement ratio in concrete should be appropriately increased; at the same time, select appropriate cementitious materials according to specific conditions, and control the fluidity and slump of concrete;

[0009] Step 4: Mix all the raw materials using a dry mixing method, and then perform compression molding under high temperature and high pressure.

[0010] As a further solution of the present invention, the magnetic sorting device includes a base, a sorting cylinder is fixedly arranged on the top of the base, a conveying cylinder is arranged through the sorting cylinder, and the conveying cylinder is coaxially arranged with the sorting cylinder; a first feed port is arranged on the top of the conveying cylinder; a spiral conveying blade is rotatably arranged in the conveying cylinder, and a first driving mechanism for driving the spiral conveying blade to rotate is arranged on the top of the base; an electromagnet is arranged inside the spiral conveying blade; a first partition is fixedly installed in the sorting cylinder, and the first partition divides the sorting cylinder into a sorting area and a unloading area; a plurality of second partitions are arranged in the unloading area; a plurality of second partitions The plate divides the sorting area into several sorting cavities, and each of the sorting cavities is provided with a plurality of push plates distributed in a circular array; the push plates are fixedly connected to the adjacent second partitions; a second driving mechanism for driving the second partition to rotate is also provided on the top of the sorting cylinder; a first discharge port, a second discharge port, a third discharge port and a second feed port are provided on the conveying cylinder; multiple first discharge ports and second feed ports are provided, and the number is the same as the number of sorting cavities; multiple first discharge ports and second feed ports are respectively arranged in several sorting cavities; the second discharge port is arranged in the unloading area, and the third discharge port is arranged on the outside of the sorting cylinder.

[0011] As a further solution of the present invention, a filter screen is arranged at the bottom of the sorting cylinder, and the filter screen is located in the sorting area. A conveying channel is fixedly connected to the bottom of the sorting cylinder, and the conveying channel is located directly below the filter screen.

[0012] As a further solution of the present invention, the push plate is slidably connected to a feed plate; the feed plate is fixedly connected to a guide slider; the inner wall of the sorting chamber is provided with a guide groove, the guide groove consists of an arc segment and a peak segment, and the guide slider can slide in the guide groove.

[0013] As a further solution of the present invention, a plurality of the second partitions are commonly fixedly connected with a sliding column, the feeding plate is slidably connected to the sliding column, a sliding cylinder is installed inside the sliding column, and an elastic reset part for resetting the sliding cylinder is arranged inside the sliding column; a stirring rod is rotatably mounted on the sliding cylinder, and a protrusion is fixedly connected to the inner wall of the sorting cylinder, and the protrusion can drive the sliding cylinder to slide.

[0014] As a further solution of the present invention, a feeding funnel located above the first feeding port is fixedly connected to the conveying cylinder.

[0015] As a further solution of the present invention, the first driving mechanism includes a first motor, which is mounted on a base, a first sprocket is fixedly connected to the output shaft of the first motor, the first sprocket is connected to the second sprocket through a first chain transmission, and the second sprocket is fixedly mounted on the rotating shaft of the spiral conveying blade.

[0016] As a further solution of the present invention, the second driving mechanism includes a second motor, which is installed on the sorting drum. A third sprocket is fixedly connected to the output shaft of the second motor. The third sprocket is connected to the fourth sprocket through a second chain transmission. A driving wheel is fixedly connected to the rotating shaft of the fourth sprocket. The driving wheel is connected to the inner core of the second partition and can drive the second partition to rotate.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention arranges the sorting cylinder, the conveying cylinder, the second partition plate, the push plate, the first discharge port and the second feed port. The spiral conveying blades in the conveying cylinder can convey the crushed waste concrete from left to right. The steel bars and other metals in the concrete will be adsorbed on the surface of the electromagnet and conveyed to the right by the spiral conveying blades. The concrete will fall from the first discharge port and then be pushed by the push plate to enter the conveying cylinder from the second feed port. After the concrete falls into the sorting cavity, the spiral conveying blades will not be affected by the concrete when conveying the steel bars and other metals adsorbed on the surface of the electromagnet. The steel bars and other metals can be quickly dropped from the third discharge port, and the steel bars and other metals will not accumulate in the conveying cylinder. The push plate can stir the concrete when conveying the concrete, so that a small amount of steel bars and other metals that cannot be completely separated from the concrete can be separated from the concrete block. Then, when the concrete enters the conveying cylinder again, the steel bars and other metals will be adsorbed by the electromagnet again. The steel bars and other metals in the concrete can be completely removed by repeatedly sorting the electromagnets. The magnetic sorting device can work continuously, which can greatly improve the sorting efficiency of the steel bars and other metals in the waste concrete. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a flow chart of the method of the present invention;

[0020] Figure 2 It is a schematic diagram of the structure of the magnetic separation device of the present invention;

[0021] Figure 3 It is a schematic cross-sectional view of the structure of the magnetic separation device of the present invention;

[0022] Figure 4 It is a schematic diagram of the connection relationship and position relationship of the second partition plate, the push plate and the feed plate of the present invention;

[0023] Figure 5 It is a cross-sectional schematic diagram of the guide chute structure of the present invention;

[0024] Figure 6 It is a schematic diagram of the structure of the sliding column, sliding cylinder and stirring rod of the present invention.

[0025] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0026] Base 1, sorting cylinder 2, conveying cylinder 3, first feed port 4, spiral conveying blade 5, electromagnet 6, first partition 7, second partition 8, push plate 9, first discharge port 10, second discharge port 11, third discharge port 12, second feed port 13, filter screen 14, conveying channel 15, feeding plate 16, guide slider 17, guide chute 18, slide column 19, slide cylinder 20, stirring rod 21, bump 22, feed funnel 23, first motor 24, first sprocket 25, first chain 26, second sprocket 27, second motor 28, third sprocket 29, second chain 30, fourth sprocket 31, driving wheel 32. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] See also Figure 1-6 The present invention provides a technical solution: a method for preparing ultra-high performance concrete using recycled aggregate from construction waste, the method comprising the following steps:

[0029] Step 1: Pre-processing of construction waste, including crushing the discarded concrete by hammering, and then selecting the metal and steel bars through a magnetic sorting device;

[0030] Step 2: Prepare the recycled aggregate, crush it with a jaw crusher, remove fine particles below 5mm, and obtain particles of 5-40mm; then use an eccentric rotating device to collide and grind it, remove mortar and cement slurry, and thus obtain recycled aggregate;

[0031] Step 3: Then, according to the physical and mechanical properties of recycled aggregates, combined with engineering requirements and use environment, design a reasonable concrete mix ratio; since recycled aggregates have great water absorption, the water-cement ratio in concrete should be appropriately increased; at the same time, select appropriate cementitious materials according to specific conditions, and control the fluidity and slump of concrete;

[0032] Step 4: Mix all the raw materials using a dry mixing method, and then perform compression molding under high temperature and high pressure.

[0033] As a further solution of the present invention, the magnetic sorting device includes a base 1, a sorting cylinder 2 is fixedly arranged on the top of the base 1, a conveying cylinder 3 is penetrated in the sorting cylinder 2, and the conveying cylinder 3 is coaxially arranged with the sorting cylinder 2; a first feed port 4 is arranged on the top of the conveying cylinder 3; a spiral conveying blade 5 is rotatably arranged in the conveying cylinder 3, and a first driving mechanism for driving the spiral conveying blade 5 to rotate is arranged on the top of the base 1; an electromagnet 6 is arranged inside the spiral conveying blade 5; a first partition 7 is fixedly installed in the sorting cylinder 2, and the first partition 7 divides the sorting cylinder 2 into a sorting area and a feeding area; a plurality of second partitions 8 are arranged in the feeding area; a plurality of second partitions 8 separate the sorting cylinder 2 into a sorting area and a feeding area. The selection area is divided into several sorting cavities, each of which is provided with a plurality of push plates 9 distributed in a circular array; the push plates 9 are fixedly connected to the adjacent second partition plate 8; a second driving mechanism for driving the second partition plate 8 to rotate is also provided on the top of the sorting cylinder 2; a first discharge port 10, a second discharge port 11, a third discharge port 12 and a second feed port 13 are provided on the conveying cylinder 3; the first discharge port 10 and the second feed port 13 are provided in plurality, and the number is the same as the number of sorting cavities; the plurality of the first discharge ports 10 and the second feed ports 13 are respectively arranged in a plurality of sorting cavities; the second discharge port 11 is arranged in the unloading area, and the third discharge port 12 is arranged on the outside of the sorting cylinder 2.

[0034] When working, Figure 2-Figure 4As shown, the waste concrete after hammering and crushing is put into the conveying cylinder 3 from the first feed port 4, and then the first driving mechanism drives the spiral conveying blades 5 to convey the waste concrete from left to right; after the waste concrete enters the conveying cylinder 3, the steel bars and other metals therein will be adsorbed on the outer cylinder wall of the electromagnet 6 under the magnetic force of the electromagnet 6; when the concrete moves to the first first discharge port 10 from the left in the conveying cylinder 3, the concrete will fall from the first discharge port 10 into the sorting chamber, and at this time the spiral conveying blades 5 will continue to convey the steel bars and other metal materials to the right; the second driving mechanism will drive the second partition plate 8 to rotate in the sorting cylinder 2, and the second partition plate will drive the push plate 9 to rotate synchronously, and the push plate 9 will push the concrete block that falls to the bottom of the sorting chamber to rotate synchronously, until the push plate 9 pushes the concrete block to move to the side of the second feed port 13, and then the concrete will enter the conveying cylinder 3 again from the second feed port 13; then The spiral conveying blade 5 will then convey the concrete to the right; the concrete will be mixed when it is pushed by the pushing plate 9 in the sorting chamber, and after the subsequent concrete enters the conveying cylinder 3, the metal of the steel bars remaining in the concrete will be adsorbed by the electromagnet 6 again, and then when the concrete moves to the second first discharge port 10 from the left, the concrete will fall into the second sorting chamber; then the steel bars and other metals will continue to be conveyed to the right by the spiral conveying blades; then the pushing plate 9 pushes the concrete in the second sorting chamber upward to the side of the second second feed port 13, and then the concrete will enter the conveying cylinder 3 again from the second second feed port 13, and a small amount of steel bars and other metals will be adsorbed by the electromagnet 6 again; the above sorting process is repeated in sequence until the conveying cylinder 3 conveys the concrete to the second discharge port 11, at which time the steel bars and other metals in the concrete are completely removed after multiple rounds of sorting, and then the concrete can fall from the second discharge port 11; Figure 3As shown, the length of the electromagnet 6 is similar to that of the sorting drum 2. When the spiral conveying blades convey the steel bars and other metals to the side of the third discharge port 12, the magnetic force of the electromagnet 6 disappears, and the steel bars and other metals will fall from the third discharge port 12. The present invention arranges the sorting drum 2, the conveying drum 3, the second partition plate 8, the push plate 9, the first discharge port 10 and the second feed port 13. The spiral conveying blades 5 in the conveying drum 3 can convey the crushed waste concrete from left to right. The steel bars and other metals in the concrete will be adsorbed on the surface of the electromagnet 6 and conveyed to the right by the spiral conveying blades 5, and the concrete will fall from the first discharge port 10, and then be pushed by the push plate 9 to enter the conveying drum 3 from the second feed port 13. After the soil falls into the sorting chamber, the spiral conveying blades 5 will not be affected by the concrete when conveying the steel bars and other metals adsorbed on the surface of the electromagnet, so that the steel bars and other metals can quickly fall from the third discharge port 12, and the steel bars and other metals will not accumulate in the conveying cylinder 3; and the push plate 9 can stir the concrete when conveying the concrete, so that a small amount of steel bars and other metals that have not been completely separated from the concrete can be separated from the concrete block, and then when the concrete enters the conveying cylinder 3 again, the steel bars and other metals will be adsorbed by the electromagnet 6 again. By repeatedly sorting the electromagnet, the steel bars and other metals in the concrete can be completely removed, and the magnetic sorting device can work continuously, which can greatly improve the sorting efficiency of steel bars and other metals in the waste concrete.

[0035] As a further solution of the present invention, a filter screen 14 is provided at the bottom of the sorting cylinder 2 , and the filter screen 14 is located in the sorting area. A conveying channel 15 is fixedly connected to the bottom of the sorting cylinder 2 , and the conveying channel 15 is located directly below the filter screen 14 .

[0036] When working, Figure 3 As shown, a filter screen 14 is provided at the bottom of the sorting drum 2. The fine particles and dust in the concrete falling into the sorting drum 2 can fall into the conveying channel 15 through the filter screen 14. The fine particles and dust can enter the collecting box (not shown in the figure) along the conveying channel 15, which can prevent the dust from floating in the air when the concrete fragments are collected later, causing air pollution. At the same time, it can also prevent the dust from accumulating in the sorting drum 2, which affects the sorting of metal materials such as concrete and steel bars.

[0037] As a further solution of the present invention, the push plate 9 is slidably connected to a feed plate 16; the feed plate 16 is fixedly connected to a guide slider 17; a guide groove 18 is opened on the inner wall of the sorting chamber, and the guide groove 18 consists of an arc segment and a peak segment, and the guide slider 17 can slide in the guide groove 18.

[0038] When working, Figure 3-5As shown, when the second partition plate 8 drives the push plate 9 to rotate, the push plate 9 will drive the feeding plate 16 to rotate synchronously, and the feeding plate 16 will drive the guide slider 17 to slide in the guide slot 18; it should be noted that, as Figure 5 As shown, the guide slot 18 is about Figure 5 The cross-sectional surfaces in the drawing are arranged symmetrically; when the guide slider 17 slides in the guide slot 18, the feed plate 16 rotates 90° from the bottom vertical position to the horizontal position and then continues to rotate, the guide slider 17 will cooperate with the guide slot 18 to drive the feed plate 16 to move toward the side close to the second feed port 13, and the feed plate 16 will push the concrete fragments between the two adjacent push plates 9 to the right, so that all the concrete fragments in the sorting chamber can fall into the conveying cylinder 3 through the second feed port 13, which can greatly improve the sorting efficiency of the concrete fragments.

[0039] As a further solution of the present invention, multiple second partitions 8 are commonly fixedly connected with a slide column 19, the feeding plate 16 is slidably connected to the slide column 19, a slide cylinder 20 is installed inside the slide column 19, and an elastic reset part for resetting the slide cylinder 20 is arranged inside the slide column 19; a stirring rod 21 is rotatably installed on the slide cylinder 20, and a protrusion 22 is fixedly connected to the inner wall of the sorting cylinder 2, and the protrusion 22 can drive the slide cylinder 20 to slide.

[0040] When working, Figure 4-Figure 6 As shown, the second partition 8 will drive the slide column 19 to rotate synchronously during the rotation process, and the slide column 19 will drive the slide cylinder 20 to rotate synchronously. The concrete fragments will hit the slide column 19 when falling into the sorting chamber. At the same time, when the slide column 19 rotates, the protrusion 22 set on the inner wall of the sorting cylinder 2 will cooperate with the elastic reset member to drive the slide cylinder 20 to move back and forth in the slide column 19, and the slide cylinder 20 will drive the stirring rod 21 to move synchronously, and the stirring rod 21 will knock and mix the concrete fragments; it can better separate the metals such as steel bars that have not been completely separated from the concrete from the concrete blocks, and can greatly improve the sorting efficiency of steel bars and other metals in waste concrete.

[0041] As a further solution of the present invention, a feeding funnel 23 located above the first feeding port 4 is fixedly connected to the conveying cylinder 3 .

[0042] When working, Figure 3 As shown, by providing the feeding funnel 23 , it is more convenient to feed the waste concrete fragments into the first feeding port 4 .

[0043] As a further solution of the present invention, the first driving mechanism includes a first motor 24, which is installed on the base 1. A first sprocket 25 is fixedly connected to the output shaft of the first motor 24. The first sprocket 25 is connected to the second sprocket 27 through a first chain 26. The second sprocket 27 is fixedly installed on the rotating shaft of the spiral conveying blade 5.

[0044] When working, Figure 2 As shown, the first motor 24 can drive the first sprocket 25 to rotate, the first sprocket 25 can drive the second sprocket 27 to rotate through the first chain 26, and the second sprocket 27 can drive the spiral conveying blade 5 to rotate and convey concrete fragments and metals such as steel bars.

[0045] As a further solution of the present invention, the second driving mechanism includes a second motor 28, which is installed on the sorting drum 2. A third sprocket 29 is fixedly connected to the output shaft of the second motor 28. The third sprocket 29 is connected to a fourth sprocket 31 through a second chain 30. A driving wheel 32 is fixedly connected to the rotating shaft of the fourth sprocket 31. The driving wheel 32 is integrated with the second partition plate 8 and can drive the second partition plate 8 to rotate.

[0046] When working, Figure 2 and Figure 3 As shown, the second motor 28 can drive the third sprocket 29 to rotate, the third sprocket 29 can drive the fourth sprocket 31 to rotate through the second chain 30, the fourth sprocket 31 will drive the driving wheel 32 to rotate, and the driving wheel 32 will drive the second partition 8 to rotate.

[0047] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0048] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing ultra-high performance concrete using recycled aggregate from construction waste, characterized in that: The method comprises the following steps: Step 1: Pre-processing of construction waste, including crushing the discarded concrete by hammering, and then selecting the metal and steel bars through a magnetic sorting device; Step 2: Prepare the recycled aggregate, crush it with a jaw crusher, remove fine particles below 5mm, and obtain particles of 5-40mm; then use an eccentric rotating device to collide and grind it, remove mortar and cement slurry, and thus obtain recycled aggregate; Step 3: Then, according to the physical and mechanical properties of recycled aggregates, combined with engineering requirements and use environment, design a reasonable concrete mix ratio; since recycled aggregates have great water absorption, the water-cement ratio in concrete should be appropriately increased; at the same time, select appropriate cementitious materials according to specific conditions, and control the fluidity and slump of concrete; Step 4: Mix all the raw materials using a dry mixing method, and then perform compression molding under high temperature and high pressure; The magnetic separation device comprises a base (1), a separation cylinder (2) is fixedly arranged on the top of the base (1), a conveying cylinder (3) is arranged through the separation cylinder (2), and the conveying cylinder (3) is coaxially arranged with the separation cylinder (2); a first feeding port (4) is arranged on the top of the conveying cylinder (3); a spiral conveying blade (5) is rotatably arranged in the conveying cylinder (3), and a first driving mechanism for driving the spiral conveying blade (5) to rotate is arranged on the top of the base (1); an electromagnet (6) is arranged inside the spiral conveying blade (5); a first partition (7) is fixedly installed in the separation cylinder (2), and the first partition (7) divides the separation cylinder (2) into a separation area and a feeding area; a plurality of second partitions (8) are arranged in the feeding area; and a plurality of second partitions (8) separate the separation area The conveying cylinder (3) is divided into a plurality of sorting chambers, each of which is provided with a plurality of push plates (9) distributed in a circular array; the push plates (9) are fixedly connected to the adjacent second partition plates (8); a second driving mechanism for driving the second partition plates (8) to rotate is also provided on the top of the sorting cylinder (2); a first discharge port (10), a second discharge port (11), a third discharge port (12) and a second feed port (13) are provided on the conveying cylinder (3); a plurality of the first discharge ports (10) and the second feed ports (13) are provided, and the number of the first discharge ports (10) and the second feed ports (13) are the same as the number of the sorting chambers; the plurality of the first discharge ports (10) and the second feed ports (13) are respectively provided in a plurality of sorting chambers; the second discharge port (11) is provided in the unloading area, and the third discharge port (12) is provided on the outside of the sorting cylinder (2).

2. The method for preparing ultra-high performance concrete using recycled aggregate from construction waste according to claim 1, characterized in that: A filter screen (14) is arranged at the bottom end of the sorting cylinder (2), and the filter screen (14) is located in the sorting area. A conveying channel (15) is fixedly connected to the bottom of the sorting cylinder (2), and the conveying channel (15) is located directly below the filter screen (14).

3. The method for preparing ultra-high performance concrete using recycled aggregate from construction waste according to claim 1, characterized in that: The push plate (9) is slidably connected to a feed plate (16); the feed plate (16) is fixedly connected to a guide slide block (17); a guide slide groove (18) is provided on the inner wall of the sorting chamber, the guide slide groove (18) is composed of a circular arc segment and a wave peak segment, and the guide slide block (17) can slide in the guide slide groove (18).

4. The method for preparing ultra-high performance concrete using recycled aggregate from construction waste according to claim 3, characterized in that: A plurality of the second partitions (8) are commonly fixedly connected with a slide column (19), the feed plate (16) is slidably connected to the slide column (19), a slide cylinder (20) is mounted inside the slide column (19), and an elastic reset member for resetting the slide cylinder (20) is arranged inside the slide column (19); a stirring rod (21) is rotatably mounted on the slide cylinder (20), and a protrusion (22) is fixedly connected to the inner wall of the sorting cylinder (2), and the protrusion (22) can drive the slide cylinder (20) to slide.

5. The method for preparing ultra-high performance concrete using recycled aggregate from construction waste according to claim 1, characterized in that: The conveying cylinder (3) is fixedly connected to a feeding funnel (23) located above the first feeding port (4).

6. The method for preparing ultra-high performance concrete using recycled aggregate from construction waste according to claim 1, characterized in that: The first driving mechanism comprises a first motor (24), the first motor (24) being mounted on a base (1), a first sprocket (25) being fixedly connected to an output shaft of the first motor (24), the first sprocket (25) being transmission-connected to a second sprocket (27) via a first chain (26), and the second sprocket (27) being fixedly mounted on a rotating shaft of a spiral conveying blade (5).

7. The method for preparing ultra-high performance concrete using recycled aggregate from construction waste according to claim 1, characterized in that: The second driving mechanism comprises a second motor (28), the second motor (28) is mounted on the sorting drum (2), a third sprocket (29) is fixedly connected to the output shaft of the second motor (28), the third sprocket (29) is connected to the fourth sprocket (31) via a second chain (30), a driving wheel (32) is fixedly connected to the rotating shaft of the fourth sprocket (31), and the driving wheel (32) is connected to the inner core of the second partition (8) and can drive the second partition (8) to rotate.

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