KR20170021109A

KR20170021109A - Distribute process of waste concrete micropowder and concrete product using the same

Info

Publication number: KR20170021109A
Application number: KR1020150115515A
Authority: KR
Inventors: 김봉주; 김진만; 정의인; 유재성
Original assignee: 공주대학교 산학협력단
Priority date: 2015-08-17
Filing date: 2015-08-17
Publication date: 2017-02-27

Abstract

The present invention relates to a process of classifying fine powder of waste concrete that can be used as a concrete product according to the classification of fine particles into respective particle sizes based on 50 탆 on the basis of a cyclone classifier when classifying fine powder of waste concrete, Products.
The present invention relates to a method for producing waste concrete, comprising the steps of: classifying fine powder of waste concrete into a size of less than 50 탆; .

Description

Technical Field [0001] The present invention relates to a process for classifying fine powder of waste concrete and a concrete product using the same.

The present invention relates to a process for classifying fine powder of waste concrete and a concrete product using the same. More particularly, the present invention relates to a method of classifying waste concrete powder into particles, and a method of producing a concrete product according to the hone- will be.

The amount of construction waste generated is continuously increasing due to the deterioration of the structures that have been constructed so far, which causes the increase of the total waste generation amount. Especially, waste concrete has 49,352 (ton / day), resulting in about 18 million tons per year, and its quantity is increasing rapidly every year. However, since proper recycling methods can not be found, they are simply used as roadbed materials or buried in final landfills. Therefore, the importance of recycling of waste concrete is increasing more than before.

In addition, since 60-65% of the construction waste is waste concrete, it is important to increase the recycling rate of waste concrete in order to increase the recycling rate of construction waste.

Waste concrete has also been a topic of development for many years because it has a high value as a valuable resource compared to other wastes.

Currently, natural aggregates use an enormous amount of more than 260 million tons per year, but the need for new alternative resources is increasing as the acquisition of aggregate resources becomes more difficult in order to preserve the natural environment.

In this context, many concrete researchers have tried to use waste concrete as a concrete aggregate. However, recycled aggregate produced by crushing waste concrete has poor physical properties such as water absorption and specific gravity as compared with ordinary aggregate. Therefore, The strength of the recycled concrete produced, and the physical properties such as drying shrinkage are also reduced.

As described above, the quality of the recycled aggregate is poor due to a large amount of old concrete or old mortar that necessarily exists in the recycled aggregate, so that the quality of the recycled aggregate improves when removed.

In addition, it is possible to improve the balanced quality of materials by classifying particles of various sizes of recycled aggregate and producing cement to fit each particle.

Research on this field has been carried out in a wide variety of ways in Japan, such as Tadashi Takahashi, Abe Michi? Etc., can be obtained by improving the number of crushing of waste concrete to remove old concrete and old mortar part, and when crushing more than 3 times by disposing the kind of crusher properly, recycled aggregate of the same level as ordinary aggregate can be obtained However, in this case, the recovery rate of recycled coarse aggregate is about 30%, and the remaining 70% is left as recycled fine aggregate and waste concrete fine powder, suggesting that their use needs to be developed.

In addition, Furusawa and Furusawa have proposed a method of using both heating and pulverizing in order to effectively remove old concrete and mortar part in the production of recycled aggregate. This method also requires a high energy cost as well as a high generation of fine powder There is a problem with economy.

Considering the above results, recycling of waste concrete is inevitable and the most reasonable method is to use it as a concrete aggregate. However, in order to produce high quality recycled aggregate that can be used as concrete aggregate, Recycling of recycled coarse aggregate and circulating fine aggregate as well as recycled concrete powder which is generated in large quantities is an urgent problem.

The object of the present invention is to provide a fine powder classification of waste concrete and a concrete product using the same, by recycling waste concrete fine powder and classifying it by advanced technology to recycle industrial byproducts.

The present invention also provides a classifier for waste concrete and a concrete product using the waste concrete, which reduces the production cost of producing concrete products by classifying waste concrete, which is an industrial by-product, into fine powder by particle and using the same as a concrete pile or an extruded panel .

The fine powder fractionation process of waste concrete and the concrete product using the same according to the above-described embodiments of the present invention classify the fine powder of waste concrete into particles, and classify the fine powder into particles of less than 50 μm using a cyclone classifier; .

According to one embodiment, the cyclone classifier includes a fan capable of classifying fine powder and a fine mesh.

According to one embodiment, the fine powder of waste concrete of less than 50 탆 is characterized by centrifugal force molding at the time of molding.

According to an embodiment of the present invention, the concrete pile is formed by using fine powder of waste concrete of less than 50 탆.

As described above, according to the embodiments of the present invention, the waste fine powder is recovered and cyclone classified, and the classified fine powder can be hardened by using an autoclave (high-temperature high-pressure steam curing). The hardened fine powder is formed into a hollow concrete pipe file in the center, and it is possible to recycle waste concrete fine powder.

Also, production cost of producing concrete products can be reduced by producing concrete pile or extruded panel through fine powder of waste concrete classified by particle.

1 is a block diagram of a waste concrete fine powder classifying process according to an embodiment of the present invention.
2 is a view showing a structure of a cyclone classifier related to an embodiment of the present invention.
3 is a block diagram of a concrete product manufacturing process according to an embodiment of the present invention.
4 is a view showing a structure of a centrifugal force molding machine according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings, in which: FIG. It should be understood, however, that it is not intended to be limited to the particular embodiments of the invention but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

In addition, in adding reference numerals to the constituent elements of the drawings, it is to be noted that the same constituent elements are denoted by the same reference numerals even though they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the understanding why the present invention is not intended to be interpreted.

Hereinafter, one embodiment of the fine powder classification process of waste concrete of the present invention and the concrete product using the same will be described with reference to FIG. For reference, FIG. 1 is a block diagram of a fine powder classification process of waste concrete.

Referring to the drawings, the finer powder classification process of waste concrete of the present invention and the concrete product using the same include a crushing process 100, a classification process 200, a molding process 300, and an extraction process 400.

The waste concrete from the building is collected and put into a large crushing machine. The waste concrete is produced as recycled aggregate through various processes such as primary pulverization, secondary pulverization, primary sorting, and secondary sorting. In the pulverizing process (100), the pulverized powder is generated as sludge in the wet process, The dried fine powder will be generated. The sludge is made into dried fine powder through the drying process and is stored together with the existing fine powder to move for the classification process 200.

The classification step 200 includes a classifying step 210 of less than 50 탆 and a classifying step 220 of 50 탆 or more. The fine powder transferred for the classification process 200 is introduced into the cyclone classifier 600 and rotates and falls inside. Inside the cyclone classifier (600), a fine mesh (650) for classifying fine powder or a fan for generating wind is provided so that the fine powder can be classified by weight or size when it rotates and falls.

The cyclone classifying apparatus 600 may be arranged such that the intensity of the wind is controlled and the fine powder is classified according to the size so that the fine powder is classified through the classifying step 210 of less than 50 탆 and the classifying step 220 of 50 탆 or more The fine mesh 650 is formed to fit in the falling passage. The fine powder is primarily rotated and dropped, and the fine powder by the wind is classified into another path, and then classified again by the fine mesh 650 again. Fine particles of large particles or heavy particles of fine particles which are not classified can be classified and used for other purposes.

The fine powder divided by the classifying step 210 of less than 50 탆 and the classifying step of 220 탆 or more is put into the forming step 300 to enter the mixing and molding step and each fine powder suitably controls the horn- And mixed with other materials to become cement.

In the molding step 300, the blended fine powder cement is put into a rotating cylindrical molding machine to produce a concrete pile by centrifugal force. The fine powder cement injected into the centrifugal force forming machine 700 is a cement mixed with fine powder of less than 50 탆 mixed and injected into a rotating cylindrical molding machine to form a hollow space in the center portion by centrifugal force, do.

In the extraction step (400), the fine powdered cement of less than 50 탆 introduced into the rotating cylindrical molding machine is gradually hardened in the form of a pipe having a circular hole formed therein. Completely hardened cement is extracted and used as a concrete pipe or pile for various purposes.

Hereinafter, the fine powder classification process of the waste concrete of the present invention and one embodiment of the concrete product using the same will be described with reference to FIG. 2 is a view showing the internal structure of the cyclone classifier 600. As shown in FIG.

Referring to the drawings, the process of finely pulverizing waste concrete of the present invention and the concrete product using the same include a cyclone classifier 600, a waste concrete fine powder 610, a powder of less than 50 μm 620, a powder of more than 50 μm 630, An aspirator 640, and a fine mesh 650. [

The waste concrete fine powder 610 generated by pulverizing the waste concrete enters the inlet of the cyclone classifier 600 and rotates around the inhaler 640 installed at the center of the inside. The fine mesh 650 is formed at the bottom entrance of the aspirator 640 so that the waste concrete fine powder 610 can be classified on the basis of 50 占 퐉. The hole size of the fine mesh 650 is formed so that waste concrete fine powder 610 having a size of less than 50 μm can pass through.

The inhaler 640 is a device for classifying the waste concrete fine powder 610 in a primary order. The fan rotates inside the inhaler 640 and sucks the powder 620 of less than 50 μm.

In addition, the speed of the fan can be adjusted so that the sizes and weights of fine powders can be classified differently depending on the situation. The suction port 640 has an outlet at the upper end of the suction port 640 through which the powder 620 that has been suctioned and sucked in can be escaped, so that the filtered fine powder can be separately stored.

The fine powder having a size exceeding 50 mu m passes through the inhaler 640 as it is without regard to the suction force and the powder 620 smaller than 50 mu m moves in accordance with the suction direction of the inhaler 640. [

The large particle waste concrete fine powder 610 of 50 mu m or more filtered in the second classification process in which the powder 620 of less than 50 mu m is sucked into the inhaler 640 and classified in the fine mesh 650 is not sucked and falls into the lower storage .

The powder (620) and the powder (630) having a size of less than 50 mu m classified by the cyclone classifier (600) are blended with other materials according to the respective use purposes and molded to produce a concrete product.

The method of classifying by inhalation through the inhaler 640 and the fine mesh 650 in the classifying process of the cyclone classifier 600 is not limited thereto and various classification methods such as classifying fine powder through vibration and classifying fine powder using wind Can be used. It is sufficient if the fine powder 610 of the waste concrete is classified into a size smaller than 50 mu m.

Hereinafter, the finer classification process of the waste concrete of the present invention and the concrete product using the same will be described with reference to FIG. 3 is a block diagram of a concrete product manufacturing process.

Referring to the drawings, the process of finely pulverizing waste concrete of the present invention and the concrete product using the same include a concrete product production process 500, a powder injection step 510, a mixing amount control step 520, a compounding step 530, (540), and a product extraction step (550).

After the classification process, the fine powder classified to a size of less than 50 μm is put into the centrifugal molding machine 700. The fine powder less than 50 ㎛ controls the horn adoption according to the concrete product to be manufactured, and it is mixed with various materials such as cement, aggregate, silicate, and mixed material to control the horn adoption. The material to be incorporated is not limited to this, and it is satisfactory if a combination of various materials is possible, and a combination of materials capable of obtaining high strength properties is obtained.

In the fine powder injecting step 100, the waste concrete is collected, and the fine powder produced after the pulverization is input to the cyclone classifying apparatus 600. The pulverized concrete powder was pulverized and screened through various processes at the pulverization stage. However, in order to classify finer fine particles, classification of fine powder is performed once more in a dust collector such as cyclone classifier 600.

The finely classified fine powder is divided into a powder (620) of less than 50 탆 and a powder (630) of more than 50 탆 based on 50 탆. Each fine powder is produced as a concrete product through different processes.

In the process of classifying the fine powder charged in the cyclone classifier 600, the fine powder is divided by 50 μm through the wind or fine mesh 650 when it rotates. The powder 620 having a diameter of less than 50 탆 divided on the basis of 50 탆 is sent out to the other outlet of the cyclone classifier 600 and classified. The powder 630 having a diameter of 50 mu m or more is stored in a reservoir located under the cyclone classifier 600 and stored.

In detail, the fine powder passing through the fan or the fine mesh 650 located inside the cyclone classifier 600 is classified on the basis of the force of the wind or the size of the fine mesh 650 on the basis of 50 μm. Fine powders of a certain weight or less can be classified with fine powders of a predetermined weight or more by a constantly adjusted wind.

The powder (620) of less than 50 mu m and the powder (630) of more than 50 mu m are mixed with various mixed materials, aggregate, silicate and cement and put into the blender. Various kinds of materials are added with different mixing amounts according to the required strength of the concrete product, and the powder 620 having a size of less than 50 탆 is also adjusted by adjusting the mixing amount. In centrifugal molding products, autoclave (high-temperature high-pressure steam curing) is performed to obtain high-strength products in the same manner as extruded products, and silica sand is mixed to promote the production of tobermorite, which is a hydration product.

The mixed materials are subjected to a blending process so that they can be mixed well by the blender in the blending step 530. But may be blended by a cylindrical rotating blade, or may be blended in various ways, such as by vibration blending, tilting blending, etc., but is not limited thereto.

The cement mixed with powder (620) of less than 50 탆 is put into a molding machine for centrifugal force molding and is used for producing a concrete product formed in a hole in a concrete pile or a concrete pipe by centrifugal force.

In the product extraction step 550, the produced concrete product is made into a variety of products through secondary processing or assembly depending on the application to be used, and the product can be reproduced by crushing or recycling.

In addition, it is possible to produce a product by combining various processes such as centrifugal force molding and extrusion molding, or to combine each product into a single product.

The present invention is not limited to this in the production and molding of the product, and it is sufficient if the concrete product can be appropriately used in various applications in various forms such as compression, injection molding and the like.

Hereinafter, with reference to FIG. 4, a description will be given of a finely divided finishing process of waste concrete of the present invention and an embodiment of a concrete product using the same. 4 is a view showing a structure of the centrifugal force molding machine 700. As shown in Fig.

Referring to the drawings, the process for classifying fine powder of waste concrete of the present invention and the concrete product using the same include a centrifugal force molding machine 700, a roller 710, a mold 720, and a mixed material cement 730.

The mixed material cement 730 in which waste powder 620 of the waste concrete and the different materials are mixed and mixed is injected into the mold 720 of the centrifugal molding machine 700 in the forming step 540.

The mixed material cement 730 injected through the mixed material cement inlet 740 is present in a liquid state inside the mold 720 and gradually hardens over time. The roller 710 of the centrifugal forming machine 700 rotates and rotates the template 720 at high speed together so that the inner blend material cement 730 adheres to the surface of the template 720 by centrifugal force.

The glued mixed material cement 730 is subjected to high centrifugal force by the rotating mold 720 and is compressed. The mixed material cement 730 to be compressed is hardened to have different strength depending on the centrifugal force, and the mixed material cement 730 can be hardened by controlling the centrifugal force according to the application of the product.

In the process of hardening the mixed material cement 730, the cement and a part of the waste concrete powder hydrate, and after the high temperature curing for one day, the mold 720 is demolded and then the autoclave (high temperature high pressure steam curing) So that the strength is expressed.

The mixed material cement 730, which is hardened and hardened, is formed as an empty pipe having a central part, so that it can be used as a concrete pipe or a concrete pile.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and similarities. For example, it should be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described system, structure, Appropriate results can be achieved even if replaced or replaced by water.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

100: milling process
200: Classification process
210: Less than 50 탆 classification stage
220: Classification step of 50 탆 or more
300: forming process
400: Extraction process
500: Concrete product production process
510: Step of injecting fine powder
520: mixing amount adjustment step
530: Blending step
540: forming step
550: Product Extraction Step
600: Cyclone classifier
610: Waste concrete powder
620: powder less than 50 탆
630: Powder of 50 탆 or more
640: inhaler
650: fine network
700: Centrifugal Forming Machine
710: Rollers
720: The original pattern
730: Mixed material cement
740: Mixed material cement inlet

Claims

In the step of classifying fine powder of waste concrete,
Wherein the fine powder of the waste concrete is classified into particles, and classified into a size of less than 50 탆 by using a cyclone classifier, and a concrete product using the waste concrete.

The method according to claim 1,
Wherein the concrete pile is made by using the fine powder classified into a size less than 50 탆, and a concrete product using the finely divided concrete.

3. The method of claim 2,
Wherein the concrete pile is made by centrifugal force molding, and a concrete product using the same.

The method of claim 3,
Wherein the concrete pile is made by expressing strength by hydration by high temperature steam curing, and a concrete product using the same.

The method according to claim 1,
Wherein the cyclone classifier further comprises a fine mesh formed into holes of 50 mu m in order to classify the fine powders smaller than 50 mu m in size, and a concrete product using the same.