Ceramsite pretreatment strengthening device and method for commercial ceramsite concrete

Abstract

The invention discloses a ceramsite pretreatment strengthening device and method for commercial ceramsite concrete, and belongs to the technical field of building solid waste recycling, the device comprises a pre-wetting module, an ash wrapping module, an outer surface rough treatment module and a screening module; the pre-wetting module wets the ceramsite and conveys the ceramsite to the ash wrapping module; the ash wrapping module wraps the surface of the ceramsite with a layer of cement powder and waste regenerated fibers, and the ceramsite is conveyed to the outer surface rough treatment module; the surface roughening treatment module is used for roughening the surface of the ceramsite and conveying the ceramsite to the screening module; and the screening module screens the ceramsite according to the particle size. Pretreatment strengthening before concrete pouring can be achieved, so that the strength and durability of the ceramsite concrete are improved, the segregation property of the ceramsite concrete is reduced, and the problem that commercialization and marketization are affected due to the fact that ceramsite material defects exist and no industrial strengthening means exists is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of construction solid waste recycling and relates to recycling of ceramsite, and in particular to a ceramsite pretreatment strengthening device and method for commercial ceramsite concrete. Background Art

[0002] Concrete that uses ceramsite instead of stone as the aggregate of concrete is called "ceramsite concrete". In theory, ceramsite concrete is light in weight and has high internal porosity. The water absorbed by pre-wetting can be used as an internal curing agent to prepare lightweight and high-strength concrete. However, in actual engineering, due to the low strength of ceramsite itself, the poured concrete often has problems such as low strength, large segregation, and poor durability. The above defects are particularly prominent in silt ceramsite concrete. Silt ceramsite, as the main way to regenerate river silt, is an important component of the resource utilization of urban solid waste. Therefore, many scholars and engineers have carried out a lot of research in order to improve the performance of ceramsite itself. Commonly used pretreatment and strengthening measures include pre-wetting, crushing, water-repellent agent, ash coating, fiber incorporation, etc. However, the above research is mostly limited to theoretical research or experimental stages, and is rarely used in actual engineering.

[0003] Commercial concrete is the main mode of concrete engineering application at present, so commercialization is the only way for expanded engineering application of ceramsite concrete. However, there is no industrial application device for the above-mentioned ceramsite pretreatment modification measures, which is one of the important factors that prevent ceramsite concrete from being commercialized. Summary of the invention

[0004] In view of the problems existing in the promotion of engineering application of ceramsite concrete, the present invention provides a ceramsite pretreatment strengthening device and method for commercial ceramsite concrete, aiming to promote the commercialization of ceramsite concrete and fill the gap in this field. By putting ceramsite into the pretreatment strengthening device before pouring ceramsite concrete, the ceramsite is pre-wetted, coated with lime and the outer surface is roughened in sequence, and the pretreatment strengthening before pouring concrete is realized, thereby increasing the strength and durability of ceramsite concrete and reducing the segregation of ceramsite concrete.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A ceramsite pretreatment strengthening device for commercial ceramsite concrete comprises a pre-wetting module, a ash coating module, a surface roughening treatment module and a screening module; the pre-wetting module wets the ceramsite and transfers it to the ash coating module; the ash coating module coats a layer of cement powder and waste recycled fiber on the surface of the ceramsite and transfers it to the surface roughening treatment module; the surface roughening treatment module roughens the surface of the ceramsite and transfers it to the screening module; the screening module screens the ceramsite according to the particle size.

[0007] To optimize the above technical solutions, the specific measures taken also include:

[0008] Furthermore, the pre-wetting module includes a spray container and a plurality of spray ports installed on the upper part of the spray container; an inlet is provided at the top of the spray container, and an outlet is provided at the bottom side; and the bottom surface of the spray container is inclined downward in the direction toward the ash coating module; the expanded clay is poured into the spray container from the inlet, and after being pre-wetted by spraying, it rolls into the ash coating module from the outlet under the action of the inclined bottom surface.

[0009] Furthermore, the discharge port of the spray container is provided with a discharge door which can be opened and closed.

[0010] Furthermore, the ash coating module includes a conveyor belt; the surface of the conveyor belt is covered with a layer of cement powder and waste recycled fiber, so that the surface of the expanded clay rolled into the pre-wetting module is evenly coated with a layer of cement powder and waste recycled fiber; the conveyor belt transports the ash-coated and initially solidified expanded clay to the surface roughening treatment module.

[0011] Furthermore, the conveyor belt is tilted downward in a direction toward the surface roughening treatment module; and fixed ash-coating baffles are provided on the left and right sides of the conveyor belt.

[0012] Furthermore, the surface roughening treatment module includes a vibration device and a treatment container arranged on the vibration device; the treatment container includes a flat plate, fixed baffles fixed on the left and right sides of the flat plate, and removable baffles arranged on the front and rear sides of the flat plate; steel bars are fixed on the inner surfaces of the flat plate, the fixed baffles and the removable baffles; the vibration device drives the treatment container to vibrate, and the expanded clay in the treatment container collides with the steel bars and is roughened.

[0013] Furthermore, a side of the processing container close to the ash wrapping module can be raised and lowered.

[0014] Furthermore, the end of the steel bar is at a sharp angle.

[0015] Furthermore, the screening module is a sieve for concrete coarse aggregate, and the aperture of the sieve meets the requirements of the commercial concrete coarse aggregate specification.

[0016] The present invention also provides a ceramsite pretreatment and strengthening method, which utilizes the ceramsite pretreatment and strengthening device for commercial ceramsite concrete, and comprises the following steps:

[0017] S1. Preliminarily lay a layer of cement powder and waste recycled fiber on the conveyor belt of the ash coating module;

[0018] S2, open the spray port of the pre-wetting module, and slowly put the prepared ceramsite into the feed port of the pre-wetting module to wet the surface of the ceramsite, completing the pre-wetting process;

[0019] S3, opening the discharge port at the bottom of the pre-wetting module, the ceramsite rolls into the ash coating module, and forms a layer of cement shell mixed with waste recycled fibers on the surface of the ceramsite through contact with the pre-laid cement powder and waste recycled fibers;

[0020] S4, leaving the ceramsite to initially solidify on its surface, opening the removable baffle on the rear side of the outer surface roughening module, and starting the conveyor belt to convey the ceramsite into the outer surface roughening module;

[0021] S5, lower the removable baffle at the rear side and turn on the vibration device; at this time, the cement paste wrapped on the outer surface of the ceramsite has not yet hardened, and when it contacts with the steel bar, it will leave uneven marks on the surface, and at the same time, the floating slurry and unbonded fibers on the surface of the ceramsite will be removed through collision contact;

[0022] S6. Allow the expanded clay to stand until its surface is finally solidified, open the removable baffle on the front side of the rough surface treatment module, and allow the expanded clay to enter the screening module. The expanded clay that meets the requirements of coarse aggregate in commercial concrete is obtained through screening and is used to mix commercial expanded clay concrete.

[0023] The beneficial effects of the present invention are:

[0024] 1. At present, when ceramsite is used as a coarse aggregate of building materials, it mainly has the problems of low strength, large segregation and poor durability. The ceramsite pretreatment strengthening device and method of the present invention can perform a series of strengthening measures on the ceramsite before pouring concrete, thereby improving the performance of the ceramsite concrete after pouring.

[0025] Second, the ceramsite pretreatment strengthening device and method of the present invention are innovative designs for the commercialization of ceramsite concrete. Due to the material performance problems of ceramsite itself, there is almost no commercial ceramsite concrete on the market. Numerous studies have shown that methods such as pre-wetting, surface irregularity, ash wrapping, and fiber incorporation can effectively improve the performance of ceramsite concrete, but the above research is only in the experimental research stage and has not yet been industrialized. The ceramsite pretreatment strengthening device and method proposed in the present invention combines the above research results to carry out an industrial design for ceramsite strengthening, which is helpful to promote the engineering application and commercialization of ceramsite concrete.

[0026] 3. The ceramsite pretreatment strengthening device and method proposed in the present invention can be applied to various types of ceramsite, especially silt ceramsite. Compared with clay ceramsite and shale ceramsite, silt ceramsite has lower strength and density and needs to be strengthened and pretreated before pouring concrete. As a regeneration product of river silt, promoting its recycling is an important component to achieve solid waste recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the ceramsite pretreatment strengthening device of the present invention;

[0028] Figure 2 The figures are photos of untreated ceramsite and ceramsite treated by the ceramsite pretreatment and strengthening device of the present invention; the marks in the figures are: 1, pre-wetting module; 11, spray container; 111, feed port; 112, discharge port; 12, spray port; 2, ash coating module; 21, conveyor belt; 22, ash coating baffle; 3, surface roughening treatment module; 31, vibration device; 321, flat plate; 322, fixed baffle; 323, detachable baffle; 33, steel bar; 4, screening module. DETAILED DESCRIPTION

[0029] The specific implementation of the present invention is described below with reference to the accompanying drawings.

[0030] like Figure 1 As shown, the present invention provides a ceramsite pretreatment and strengthening device for commercial ceramsite concrete, comprising a pre-wetting module 1, a ash coating module 2, a surface roughening treatment module 3 and a screening module 4.

[0031] The pre-wetting module 1 wets the ceramsite and transfers it to the ash coating module 2. The ash coating module 2 coats a layer of cement powder and waste recycled fiber on the surface of the pre-wetted ceramsite and transfers it to the surface roughening treatment module 3 after initial setting. The surface roughening treatment module 3 roughens the surface of the ceramsite that has been coated and initially set, and transfers it to the screening module 4 after final setting. The screening module 4 screens the roughened and finally set ceramsite according to the particle size.

[0032] Specifically, the pre-wetting module 1 includes a spray container 11 and a plurality of spray ports 12 installed on the upper part of the spray container 11. The top of the spray container 11 is provided with an inlet 111, and the bottom side is provided with an outlet 112. The bottom surface of the spray container 11 is inclined downward in the direction toward the ash coating module 2. The ceramsite is poured into the spray container 11 from the inlet 111, and after being pre-wetted by spraying, it is poured out from the outlet 112 under the action of the inclined bottom surface and rolled into the ash coating module 2.

[0033] Preferably, the discharge port 112 of the spray container 11 is also equipped with a discharge door that can be opened and closed. By closing the discharge door, the ceramsite can stay at the bottom of the spray container 11 for a period of time, so as to be fully pre-wetted. After the pre-wetting is completed, the discharge door can be opened to complete the transfer to the ash-wrapping module 2 through the inclined bottom surface.

[0034] The ash coating module 2 includes a conveyor belt 21. The surface of the conveyor belt 21 is covered with a layer of cement powder and waste recycled fiber, so that the surface of the ceramsite rolled in from the pre-wetting module 1 is evenly coated with a layer of cement powder and waste recycled fiber. Since the ceramsite has been pre-wetted and absorbed a certain amount of water, the cement on the surface is mixed with water to react with hydration, forming a cement shell containing waste recycled fiber wrapped on the outer surface of the ceramsite. The conveyor belt 21 conveys the ceramsite that has been coated and initially set to the surface roughening treatment module 3.

[0035] The waste recycled fibers are polypropylene fibers recycled from discarded masks and plastics, or rubber fibers recycled from discarded tires. The above-mentioned waste recycled fibers can increase the adhesion of the expanded clay surface and improve the strength, segregation and durability of expanded clay concrete.

[0036] Preferably, the conveyor belt 21 is tilted downward in the direction toward the surface roughening treatment module 3, so as to provide further rolling power for the rolled ceramsite, so that it can fully contact the cement powder and the waste recycled fiber.

[0037] Preferably, fixed ash-coating baffles 22 are provided on the left and right sides of the conveyor belt 21 to prevent the ash from falling during the rolling and conveying process.

[0038] The rough surface treatment module 3 includes a vibration device 31 and a treatment container arranged on the vibration device 31. The treatment container includes a flat plate 321, fixed baffles 322 fixed on the left and right sides of the flat plate 321, and removable baffles 323 arranged on the front and rear sides of the flat plate 321, that is, the removable baffle 323 on the front side is located between the rough surface treatment module 3 and the screening module 4, and the removable baffle 323 on the rear side is located between the ash wrapping module 2 and the rough surface treatment module 3. Steel bars 33 are fixed on the inner surfaces of the flat plate 321, the fixed baffle 322 and the removable baffle 323. By removing the removable baffle 323 near the ash wrapping module 2, the ceramsite enters the treatment container. The vibration device 31 drives the treatment container to vibrate, and the ceramsite in the treatment container collides with the steel bar 33 and is roughened. Specifically, when the expanded clay is vibrated, it collides and contacts with the surrounding steel plates, and the slurry and unbonded fibers on the surface of the expanded clay are removed through the collision. At the same time, due to the collision, the uneven state of the ash coating layer on the outer surface of the expanded clay is increased, making the originally smooth surface of the expanded clay rough.

[0039] Preferably, the side of the processing container close to the ash-coating module 2 can be raised and lowered. By removing the removable baffle 323 on the front side and raising the rear side of the processing container, the ceramsite in the processing container falls into the screening module 4. Specifically, a cylinder (not shown) is provided on the side of the bottom of the processing container close to the ash-coating module 2, and the lifting and lowering of the side of the processing container close to the ash-coating module 2 is achieved by extending and retracting the cylinder.

[0040] Preferably, the end of the steel bar 33 is sharp-angled, so as to create a rough surface on the ceramsite coating layer.

[0041] The screening module 4 is a sieve for concrete coarse aggregate, and the aperture of the sieve meets the requirements of the commercial concrete coarse aggregate specification, that is, the particle size of the concrete coarse aggregate is greater than 4.75 mm. The screening module 4 removes part of the ceramsite that exceeds the particle size requirement of the commercial concrete, as well as cement powder and waste recycled fiber that are not bonded to the surface of the ceramsite, and the sieved ceramsite is used to cast the commercial ceramsite concrete.

[0042] The ceramsite pretreatment strengthening method using the ceramsite pretreatment strengthening device comprises the following steps:

[0043] Step 1: Design the mix ratio and amount of expanded clay based on the performance requirements of commercial concrete.

[0044] Step 2: Pre-lay a layer of cement powder and waste recycled fiber on the conveyor belt of the ash coating module.

[0045] Step 3: Open the spray port of the pre-wetting module and slowly put the prepared ceramsite into the feed port of the pre-wetting module, so that the water molecules can fully contact the ceramsite to wet the surface of the ceramsite, and complete the pre-wetting process. Since the ceramsite only needs to be wet on the surface and does not need to fully absorb water inside, the spraying method can be used.

[0046] Step 4: Open the discharge port at the bottom of the pre-wetting module, and the expanded clay will roll into the ash coating module. By contacting the pre-laid cement powder and waste recycled fibers, a layer of cement shell mixed with waste recycled fibers is formed on the surface of the expanded clay.

[0047] Step 5: Leave the ceramsite to set initially on its surface, open the removable baffle on the rear side of the outer surface roughening module, and start the conveyor belt to convey the ceramsite into the outer surface roughening module.

[0048] Step 6: Lower the removable baffle at the rear and turn on the vibration device. At this time, the cement paste wrapped on the outer surface of the ceramsite has not yet hardened. When it comes into contact with the steel bar, it will leave uneven marks on the surface. At the same time, the floating slurry and unbonded fibers on the surface of the ceramsite will be removed through collision contact.

[0049] Step 7: Leave the expanded clay to stand until its surface is finally solidified, open the removable baffle on the front side of the surface roughening treatment module, and allow the expanded clay to enter the screening module. Through screening, expanded clay that meets the requirements of coarse aggregate in commercial concrete is obtained for mixing commercial expanded clay concrete.

[0050] Untreated sludge ceramsite (left) and treated sludge ceramsite (right) Figure 2 As shown. Figure 2 It can be seen that after treatment, a layer of cement shell mixed with waste recycled fiber is formed on the surface of the sludge expanded clay, and the floating slurry and fiber used for bonding are removed, and there are uneven scratches on the surface.

[0051] The cast concrete was prepared by using ceramsite treated with only pre-wetting, lime coating and surface roughening respectively, and its segregation was measured before initial setting. Meanwhile, considering the requirements of concrete compressive strength, density and consistency, the cast concrete was prepared by using the mix ratio shown in Table 1.

[0052] Table 1

[0053] 42.5 Cement sand Stone water Silt ceramsite 0.705kg 0.696kg 1.183kg 0.273kg 0.296kg

[0054] The experimental results show that pre-wetting treatment can reduce the segregation of ceramsite concrete by 1.3%, ash coating treatment can reduce it by 64.72%, and surface roughening treatment can reduce it by 29.87%. At the same time, the above process can reduce the segregation of ceramsite concrete by 75.32%. With the improvement of segregation, the strength and durability of ceramsite concrete will also be improved to a certain extent.

[0055] In the present invention, unless otherwise specified, the scientific and technical terms used herein have the meanings commonly understood by those skilled in the art. In addition, the reagents, materials and operating procedures used herein are reagents, materials and conventional procedures widely used in the corresponding fields.

[0056] It should be noted that the terms such as "upper", "lower", "left", "right", "front", "back", etc. cited in the invention are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments in their relative relationships should be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0057] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A ceramsite pretreatment and strengthening device for commercial ceramsite concrete, characterized in that: It includes a pre-wetting module, an ash coating module, a surface roughening treatment module and a screening module; The pre-wetting module wets the ceramsite and transfers it to the ash coating module; The ash coating module coats a layer of cement powder and waste recycled fiber on the surface of the ceramsite and transmits it to the surface roughening treatment module; The surface roughening treatment module roughens the surface of the ceramsite and transmits it to the screening module; The screening module screens the ceramsite according to the particle size.

2. The ceramsite pretreatment and strengthening device for commercial ceramsite concrete according to claim 1, characterized in that: The pre-wetting module includes a spray container and a plurality of spray ports installed on the upper part of the spray container; The top of the spray container is provided with a material inlet, and the bottom side is provided with a material outlet; and the bottom surface of the spray container is inclined downward in the direction toward the ash coating module; The ceramsite is poured into the spray container from the material inlet, and after being pre-wetted by the spray, it rolls into the ash-coating module from the material outlet under the action of the inclined bottom surface.

3. The ceramsite pretreatment and strengthening device for commercial ceramsite concrete according to claim 2, characterized in that: The discharge port of the spray container is equipped with a discharge door that can be opened and closed.

4. The ceramsite pretreatment and strengthening device for commercial ceramsite concrete according to claim 2, characterized in that: The ash wrapping module includes a conveyor belt; The surface of the conveyor belt is covered with a layer of cement powder and waste recycled fiber, so that the surface of the ceramsite rolled in from the pre-wet module is evenly coated with a layer of cement powder and waste recycled fiber; The conveyor belt conveys the ash-coated and initially solidified ceramsite to the surface roughening treatment module.

5. The ceramsite pretreatment and strengthening device for commercial ceramsite concrete according to claim 4, characterized in that: The conveyor belt is tilted downward in a direction toward the surface roughening treatment module; Fixed ash-wrapping baffles are provided on the left and right sides of the conveyor belt.

6. The ceramsite pretreatment and strengthening device for commercial ceramsite concrete according to claim 4, characterized in that: The surface roughness treatment module comprises a vibration device and a treatment container arranged on the vibration device; The processing container includes a flat plate, fixed baffles fixed on the left and right sides of the flat plate, and removable baffles arranged on the front and rear sides of the flat plate; steel bars are fixed on the inner surfaces of the flat plate, the fixed baffles, and the removable baffles; The vibration device drives the processing container to vibrate, and the expanded clay in the processing container collides with the steel bar and is roughly processed.

7. The ceramsite pretreatment and strengthening device for commercial ceramsite concrete according to claim 6, characterized in that: The side of the processing container close to the ash wrapping module can be raised and lowered.

8. The ceramsite pretreatment and strengthening device for commercial ceramsite concrete according to claim 6, characterized in that: The ends of the steel bars are sharp-angled.

9. The ceramsite pretreatment and strengthening device for commercial ceramsite concrete according to claim 6, characterized in that: The screening module is a sieve for concrete coarse aggregate, and the aperture of the sieve meets the requirements of the commercial concrete coarse aggregate specification.

10. A method for strengthening ceramsite pretreatment, characterized in that: The ceramsite pretreatment strengthening device for commercial ceramsite concrete as claimed in claim 9 comprises the following steps: S1. Preliminarily lay a layer of cement powder and waste recycled fiber on the conveyor belt of the ash coating module; S2, open the spray port of the pre-wetting module, and slowly put the prepared ceramsite into the feed port of the pre-wetting module to wet the surface of the ceramsite, completing the pre-wetting process; S3, opening the discharge port at the bottom of the pre-wetting module, the ceramsite rolls into the ash coating module, and forms a layer of cement shell mixed with waste recycled fibers on the surface of the ceramsite through contact with the pre-laid cement powder and waste recycled fibers; S4, leaving the ceramsite to initially solidify on its surface, opening the removable baffle on the rear side of the outer surface roughening module, and starting the conveyor belt to convey the ceramsite into the outer surface roughening module; S5, lower the removable baffle at the rear side and turn on the vibration device; at this time, the cement paste wrapped on the outer surface of the ceramsite has not yet hardened, and when it contacts with the steel bar, it will leave uneven marks on the surface, and at the same time, the floating slurry and unbonded fibers on the surface of the ceramsite will be removed through collision contact; S6. Allow the expanded clay to stand until its surface is finally solidified, open the removable baffle on the front side of the rough surface treatment module, and allow the expanded clay to enter the screening module. The expanded clay that meets the requirements of coarse aggregate in commercial concrete is obtained through screening and is used to mix commercial expanded clay concrete.

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