A kind of renewable concrete and preparation method thereof

Abstract

The present invention belongs to the technical field of concrete processing, and specifically, is a renewable concrete and a preparation method thereof; the method comprises the following steps: step one: putting concrete bricks into a dry grinding container, vibrating the dry grinding container, and shaking off and collecting particles embedded on the surface of the concrete bricks; step two: moving the concrete bricks that are not fully broken into a wet grinding container and further breaking them; step three: washing the concrete bricks to obtain recycled aggregates, configuring the recycled aggregates, sand, cement and water to obtain slurry, adding fiber material to the slurry, and fully mixing to obtain a renewable concrete product; the present application uses a shaking device to drive the discarded concrete bricks to collide and grind with each other, and adopts a combination of dry grinding and wet grinding operations, so that the solid particles embedded in the surface of the concrete bricks can be shaken off and screened out, thereby reducing the content of impurities in the over-crushed materials.

Description

Technical Field

[0001] The invention belongs to the technical field of concrete processing, and in particular relates to renewable concrete and a preparation method thereof. Background Art

[0002] Concrete accounts for a large proportion of construction materials. my country's annual output of concrete is on the rise every year. The aggregate content of concrete accounts for about three-quarters of the total concrete. The source of aggregate is mountain excavation and quarrying. The large-scale mining of aggregate has a great impact on the natural landscape and green vegetation. The most impactful one is the river digging and sand extraction, which causes a lot of soil erosion and the crisis of river diversion.

[0003] Therefore, the utilization of waste concrete and the reconfiguration of concrete with recycled aggregates have great social, environmental and economic effects. At present, large concrete bricks are mainly crushed by crushers to remove metal materials, mortar and cement slurry to obtain recycled aggregates. However, the jaw crusher has the problem of non-selectivity in the crushing process, which will cause the material to be over-crushed, resulting in small-particle aggregates containing more debris, which is inconvenient for the reuse of aggregates. Summary of the invention

[0004] In order to achieve the purpose of improving the recovery efficiency of solid particles in waste concrete, the present invention adopts the following technical solutions:

[0005] The purpose of the present invention is to provide a method of driving waste concrete bricks to collide and grind with each other by using a shaking assembly, and combining dry grinding and wet grinding operations, so that solid particles embedded in the surface of the concrete bricks can be shaken off and screened out, thereby reducing the content of debris in the material.

[0006] In order to achieve the above object, the present invention provides a method for preparing renewable concrete, comprising the following steps:

[0007] Step 1: crushing the construction waste to obtain discarded concrete bricks;

[0008] Step 2: Put the concrete bricks into the dry grinding container, vibrate the dry grinding container, and shake off and collect the particles embedded on the surface of the concrete bricks;

[0009] Step 3: Move the concrete bricks that are not fully broken into a wet grinding container, and shake the wet grinding container back and forth to make the concrete bricks collide with each other to further break them;

[0010] Step 4: Use water flow to continuously flush the concrete bricks to wash off the mortar on the concrete to obtain recycled aggregate.

[0011] Finally, the recycled aggregate, sand, cement and water are prepared to obtain slurry, and fiber material is added to the slurry. After sufficient mixing, a renewable concrete product is obtained.

[0012] The composition of the renewable concrete prepared by the renewable concrete preparation method provided in the present application includes: recycled aggregate, sand, cement, fiber material, water reducing agent and water in proportion by mass.

[0013] Among them, the fiber materials include viscose fiber, polyester fiber and polyurethane fiber.

[0014] First, a jaw crusher is used to crush large concrete bricks larger than 100 mm, and then the steel bars and metals in the crushed construction waste are removed. After that, the dry grinding assembly and wet grinding assembly in this application are used to process the concrete bricks to make them collide and grind, remove mortar and cement slurry, and obtain recycled aggregate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The following drawings are intended only to illustrate and explain the present invention, wherein:

[0016] Figure 1 is a flow chart of the method for preparing renewable concrete of the present invention;

[0017] Figure 2 The material composition diagram of the renewable concrete of the present invention;

[0018] Figure 3 The structure of the dry grinding assembly of the present invention is schematically shown in FIG. Figure 1 ;

[0019] Figure 4 The structure of the dry grinding assembly of the present invention is schematically shown in FIG. Figure 2 ;

[0020] Figure 5 It is a schematic structural diagram of the load-bearing platform, the first telescopic driver and the wet grinding container of the present invention;

[0021] Figure 6 It is a schematic diagram of the structure of the enclosure plate, the sieve plate, the corrugated plate and the collecting tank of the present invention;

[0022] Figure 7 It is a structural schematic diagram of the water pipe of the present invention;

[0023] Figure 8 It is a schematic diagram of the structure of the embedded ribs, interception bars and protection frame of the present invention;

[0024] Fig. 9 It is a schematic diagram of the structure of the protection frame and the drain trough of the present invention;

[0025] Fig.10It is a schematic structural diagram of the sealing edge, the wet grinding container and the enclosure of the present invention;

[0026] Fig.11 It is a schematic structural diagram of the third telescopic actuator and the fourth telescopic actuator of the present invention;

[0027] Fig.12 It is a schematic structural diagram of the sealing cover, valve plate and discharger of the present invention.

[0028] In the figure: the load-bearing platform 1; the first telescopic drive 11; the rocking support arm 2; the sealing edge 21; the wet grinding container 31; the rocking drive arm 32; the water pipe 33; the second telescopic drive 34; the embedded ribs 35; the intercepting strips 36; the protective frame 37; the leakage groove 38; the enclosure 41; the sieve plate 42; the multi-corrugated plate 43; the collecting groove 44; the sealing cover 51; the valve plate 52; the third telescopic drive 53; the discharger 54; the fourth telescopic drive 55. DETAILED DESCRIPTION

[0029] In order to improve the recovery efficiency of solid particles in waste concrete, the present invention provides a method for preparing renewable concrete, comprising the following steps:

[0030] Step 1: crush the construction waste to obtain discarded concrete bricks;

[0031] Step 2: Put the concrete bricks into the dry grinding container, vibrate the dry grinding container, and shake off and collect the particles embedded on the surface of the concrete bricks;

[0032] Step 3: Move the concrete bricks that are not fully broken into a wet grinding container, and shake the wet grinding container back and forth to make the concrete bricks collide with each other to further break them;

[0033] Step 4: Use water flow to continuously wash the concrete bricks to wash off the mortar on the concrete to obtain recycled aggregate;

[0034] Step 5: Prepare slurry by mixing recycled aggregate, sand, cement and water, add fiber material into the slurry, mix thoroughly and obtain a renewable concrete product.

[0035] The composition of the renewable concrete prepared by the renewable concrete preparation method in the present application includes: 500-800 parts of recycled aggregate, 250-350 parts of sand, 350-450 parts of cement, 0.5-2.5 parts of fiber material, 5-25 parts of water reducer and 120-200 parts of water in parts by mass.

[0036] The present application utilizes the switching use of dry grinding components and wet grinding components to effectively screen out solid particles embedded in the surface of concrete bricks and reduce the content of debris in the material.

[0037] The specific embodiments of the present invention are described below.

[0038] Reference Figure 3-5 , Figure 7-8 and Fig.11 As shown, it illustrates an embodiment of the method for preparing renewable concrete provided by the present invention, in which concrete bricks are subjected to collision and grinding crushing treatment, and then washed to wash off the mortar on the concrete:

[0039] The renewable concrete preparation method provided in the present application uses a wet grinding component and a dry grinding component;

[0040] The main body of the wet grinding component is a wet grinding container 31, which is rotatably mounted on a shaking support arm 2, and the shaking support arm 2 is rotatably connected to the load-bearing platform 1, so that the wet grinding container 31 can rotate around the rotating axis of the shaking support arm 2 on the load-bearing platform 1 on the basis of self-rotation, thereby increasing the shaking efficiency of the concrete bricks in the wet grinding container 31, allowing the concrete bricks to interact with each other, and undergo collision and grinding crushing processing.

[0041] A plurality of embedded ribs 35 are installed on the inner side of the wet grinding container 31, and interception bars 36 are fixedly connected between the plurality of embedded ribs 35; when the wet grinding container 31 is shaken, the concrete bricks can collide with the embedded ribs 35 and the interception bars 36, so as to facilitate the crushing of the concrete bricks.

[0042] Among them, the extension arm is fixedly connected to the shaking support arm 2 through a fastener, the first telescopic driver 11 is installed on the load-bearing platform 1, and the driving frame I installed on the movable end of the first telescopic driver 11 is slidably connected to the extension arm.

[0043] A shaking driving arm 32 is installed at the end of the wet grinding container 31 through a flange structure, and a second telescopic driver 34 is installed at both ends of the shaking support arm 2. The driving frame II installed on the movable end of the second telescopic driver 34 is slidably connected to the two ends of the shaking driving arm 32 respectively.

[0044] The telescopic drive in the present application can be an electric telescopic rod or a hydraulic cylinder. By starting the first telescopic drive 11, the wet grinding container 31 is controlled to rotate around the rotating axis of the rocking support arm 2 on the load-bearing platform 1; by starting the second telescopic drive 34, the wet grinding container 31 is controlled to rock reciprocally around its own axis.

[0045] The wet grinding container 31 is located on the upper side of the water pipe 33 and is provided with an observation window extending toward the inside of the wet grinding container 31. The observation window is a square tube structure. Concrete bricks can be added into the wet grinding container 31 through the observation window, and the crushing state of the concrete bricks can be monitored through the observation window.

[0046] Among them, a water pipe 33 is provided at one end of the wet grinding container 31 close to the shaking support arm 2, and a sealing cover 51 is installed at the other end; the sealing cover 51 is used to keep the concrete bricks in the wet grinding container 31; the water pipe 33 is used to allow the water flow to continuously flush the concrete bricks. During the shaking process of the wet grinding container 31, the water flow is in full contact with the concrete bricks to wash off the mortar on the concrete.

[0047] Reference Figure 3-6 and Figure 10-11 As shown, it illustrates an embodiment of using a dry grinding component to shake off and collect particles embedded on the surface of concrete bricks in the renewable concrete preparation method provided by the present invention:

[0048] A surrounding plate 41 is arranged on the upper side of the wet grinding container 31. The surrounding plate 41 is the main component of the dry grinding assembly. A sealing edge 21 is sleeved and installed on the outer side of the surrounding plate 41. The sealing edge 21 is fixedly connected to the rocking support arm 2 through fasteners.

[0049] A sieve plate 42 and a collecting tank 44 are welded and fixedly connected to the enclosure 41, and a plurality of corrugated plates 43 are welded and fixedly connected between the sieve plate 42 and the inner wall of one end of the enclosure 41; the sealing edge 21, the enclosure 41, the sieve plate 42 and the corrugated plates 43 constitute a dry grinding container;

[0050] During the shaking of the wet grinding container 31, the concrete bricks interact with the corrugated plates 43 to shake off the particles embedded in the surface of the concrete bricks.

[0051] A plurality of flow holes are arranged on the sieve plate 42, and the areas between the plurality of corrugated plates 43 are connected to the collecting trough 44 through the flow holes. The collecting trough 44 is sleeved and fixedly connected to the outside of the wet grinding container 31, and a discharge plate is arranged at the bottom of the collecting trough 44. When the discharge plate is opened, the solid particles embedded in the surface of the concrete bricks are screened out after being shaken off, thereby reducing the content of impurities in the material. At this time, the separation and collection of the dry solid particles are more convenient.

[0052] The concrete bricks enter the area between the plurality of multi-corrugated boards 43 from the feeding port on the sealing edge 21 . The sealing edge 21 is used to prevent the concrete bricks from falling from the enclosure 41 .

[0053] The dry grinding container is connected to the wet grinding container 31 through the discharge trough on the upper side of the wet grinding container 31. After the concrete bricks are dry ground, they are wet ground. A discharger 54 is slidably installed on the sealing cover 51. The discharger 54 can cover the discharge trough to control the brick crushing process.

[0054] Reference Figure 8-10 As shown, an embodiment of flushing and collecting mortar on concrete in the renewable concrete preparation method provided by the present invention is described:

[0055] The bottom of the wet grinding container 31 is provided with a plurality of drainage holes I for discharging the mortar that has been washed away; a protective frame 37 is installed at a corresponding position on the inner side of the wet grinding container 31 of the discharge trough, and a plurality of drainage holes II are provided on the protective frame 37. The setting of the protective frame 37 can reduce the collision damage to the bottom of the wet grinding container 31 when the concrete bricks that are not fully broken fall to the bottom of the wet grinding container 31.

[0056] Both ends of the arc-shaped protection frame 37 are provided with drain grooves 38 for fully discharging the mortar washed off the concrete bricks.

[0057] Reference Figure 11-12 As shown, an embodiment of controlling the storage position and discharge operation of concrete bricks in the renewable concrete preparation method provided by the present invention is described:

[0058] The sealing cover 51 is installed at the end of the wet grinding container 31 through fasteners, and a valve plate 52 and a discharger 54 are slidably mounted on the sealing cover 51. A third telescopic driver 53 and a fourth telescopic driver 55 for driving the valve plate 52 and the discharger 54 to move are also installed on the sealing cover 51.

[0059] The sealing cover 51 is provided with a discharge port, and the valve plate 52 can cover the discharge port.

Claims

1. A method for preparing renewable concrete, characterized in that: The following steps are involved: Step 1: crush the construction waste to obtain discarded concrete bricks; Step 2: Put the concrete bricks into the dry grinding container, vibrate the dry grinding container, and shake off and collect the particles embedded on the surface of the concrete bricks; Step 3: Move the concrete bricks that are not fully broken into a wet grinding container, and shake the wet grinding container back and forth to make the concrete bricks collide with each other to further break them; Step 4: Use water flow to continuously wash the concrete bricks to wash off the mortar on the concrete to obtain recycled aggregate; Step 5: Prepare slurry by mixing recycled aggregate, sand, cement and water, add fiber material into the slurry, mix thoroughly and obtain a renewable concrete product; The wet grinding container (31) is rotatably mounted on the shaking support arm (2), and the shaking support arm (2) is rotatably connected to the load-bearing platform (1). A water pipe (33) is provided at one end of the wet grinding container (31) close to the shaking support arm (2), and a sealing cover (51) is installed at the other end. The swing support arm (2) is fixedly connected to an extension arm, the load-bearing platform (1) is equipped with a first telescopic driver (11), and a driving frame I installed on the movable end of the first telescopic driver (11) is slidably connected to the extension arm; The wet grinding container (31) is provided with an observation window located on the upper side of the water pipe (33) and extending toward the inner side of the wet grinding container (31); A rocking drive arm (32) is mounted on the end of the wet grinding container (31) via a flange structure, and second telescopic drives (34) are mounted on both ends of the rocking support arm (2), and a drive frame II mounted on the movable end of the second telescopic drive (34) is slidably connected to both ends of the rocking drive arm (32); The wet grinding container (31) is provided with a surrounding plate (41) on the upper side, a sieve plate (42) and a collecting trough (44) are mounted on the surrounding plate (41), a plurality of corrugated plates (43) are mounted between the sieve plate (42) and the inner wall of one end of the surrounding plate (41), the collecting trough (44) is sleeved and mounted on the outer side of the wet grinding container (31), a sealing edge (21) is sleeved and mounted on the outer side of the surrounding plate (41), and the sealing edge (21) is fixedly connected to the rocking support arm (2) via a fastener; The sealing edge (21), the enclosure plate (41), the sieve plate (42) and the corrugated plate (43) constitute a dry grinding container, and the dry grinding container is connected to the wet grinding container (31) through a discharge trough on the upper side of the wet grinding container (31); A material discharger (54) is slidably mounted on the sealing cover (51), and the material discharger (54) is capable of shielding the material discharge trough; The bottom of the wet grinding container (31) is provided with a plurality of drainage holes I for discharging the washed-down mortar; a protective frame (37) is installed at a corresponding position on the inner side of the wet grinding container (31) of the discharge trough, and a plurality of drainage holes II are provided on the protective frame (37); The protection frame (37) is provided to reduce collision damage to the bottom of the wet grinding container (31) when the concrete bricks that are not fully broken fall on the bottom of the wet grinding container (31); In the process of controlling the shaking of the wet grinding container (31), the concrete bricks can collide with the embedded ribs (35) and the intercepting bars (36), thereby facilitating the crushing of the concrete bricks; During the shaking of the wet grinding container (31), the concrete bricks interact with the corrugated plate (43) to shake off particles embedded in the surface of the concrete bricks.

2. The method for preparing renewable concrete according to claim 1, characterized in that: The fiber material includes viscose fiber, polyester fiber and polyurethane fiber.

3. The renewable concrete prepared by the renewable concrete preparation method according to claim 2 is characterized in that: The renewable concrete comprises: 500-800 parts of recycled aggregate, 250-350 parts of sand, 350-450 parts of cement, 0.5-2.5 parts of fiber material, 5-25 parts of water reducing agent and 120-200 parts of water in parts by weight.

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