KR101151313B1 - Method for manufacturing precast pavers by using coal ash and closed shell - Google Patents

Abstract

PURPOSE: A method for manufacturing precast pavers by using coal ash and closed shell are provided to manufacture a sidewalk block which is enhanced strength and absorption rate. CONSTITUTION: A method for manufacturing precast pavers by using coal ash and closed shell comprise next steps: removing foreign materials of shell and boiling the shell at 700-800 deg. Celsius for 1-2 hours(s100); removing salinity of shell through washing; pulverizing a shell and coal dust(s200); manufacturing a mixture(30) which includes 13-20% of waste coal ash, 13-20% of casting sand, 28-35% of shell, sand, cement, and water based on total weight%; and curing kneaded mortar(s400).

Description

Method for manufacturing sidewalk blocks using coal ash and shells {METHOD FOR MANUFACTURING PRECAST PAVERS BY USING COAL ASH AND CLOSED SHELL}

The present invention relates to a method for manufacturing a sidewalk block using coal ash and shells, and more particularly, to a sidewalk block using coal ash and shells to produce a sidewalk block by mixing coal ash and foundry sand, shells, cement and sand, and a method of manufacturing the same. It is about.

The sidewalk block, which is built on the road for pedestrians, is made of a mixture of sand and cement.

Generally, sidewalk blocks made of a mixture of sand and cement are arranged in a row to cover sidewalks such as sidewalks, sidewalks and residential complexes, plazas, parks, and parking lots, taking into account urban aesthetics and ease of walking in urban planning. They are packed against each other.

These sidewalk blocks have various forms such as cubes and cuboids, and are used for various purposes such as bicycle driving sidewalk blocks, braille blocks, guide blocks, and special sidewalk blocks.

As mentioned above, most of the sidewalk blocks are mainly formed of concrete materials including stone and cement, which are useful because they are excellent in hardness and heat resistance.

In the case of excellent hardness, the sidewalk block has a weak durability such as being damaged due to a decrease in strength when absorbed from an external impact or moisture, and has a problem in that the pedestrian's foot is hard when walking due to its low elasticity. .

In addition, since sand and cement have a high raw material price, when sand and cement are the main materials, there is an economic problem in that the production cost for the sidewalk block is increased.

Press block manufacturing method using coal ash and shell according to the present invention, by producing a sidewalk block through a cement mortar mixed with shell and coal ash and foundry sand, provides a method of producing a sidewalk block using coal ash and shell with high strength and low absorption. Its purpose is to.

The method of manufacturing a sidewalk block using coal ash and shell according to the present invention has an object to reduce the production cost of the sidewalk block by manufacturing the sidewalk block through cement mortar mixed with the shell and coal ash and foundry sand.

In the method of manufacturing a sidewalk block using coal ash and shell according to the present invention, the shell, the coal ash and the molding sand share 80% of the compressive strength, and the mortar mixed with cement, sand and water share 20% of the compressive strength. Another object is to provide a method for manufacturing a sidewalk block using coal ash and shells.

Press block manufacturing method using coal ash and shell according to the present invention, the salt removal step of removing the salinity of the shell by washing; The shell and a grinding step of pulverizing coal ash; Kneading the mixture consisting of waste coal ash: 13-20%, foundry sand: 13-20%, shell: 28-35%, and the remaining sand and other unavoidable impurities, including cement and water, with respect to 100% by weight. Mortar step; And a curing step of curing the mortar kneaded in the mortar step.

In addition, the salinity removing step includes a calcination step of boiling the shell in water for 1 to 2 hours at a temperature of 700 to 800 ° C. to remove and grind the foreign matter of the shell.

In the crushing step, the shell and the coal ash is preferably crushed to 0.1 to 3 mm in size.

In the mortar step, it is preferable that the waste coal ash, the foundry sand and the shell share 70 to 80% of the strength, and the sand and cement share 20 to 30% of the strength, in terms of strength to 100% of the total strength.

The curing step includes a molding step of pressing the mixture to a predetermined shape to form a sidewalk block.

The curing step may further include a plastic working step of plastic working the press block formed through the molding step at a temperature of 1100 to 1200 ° C.

According to the present invention, a method for manufacturing a sidewalk block using coal ash and shells, while producing a sidewalk block through cement mortar mixed with shells and coal ash and foundry sand discarded after use, can produce a sidewalk block with high strength and low absorption rate. It works.

It is economical to reduce the production cost of the sidewalk block by manufacturing the sidewalk block, which is a mortar made of a shell and coal ash and foundry sand mixed with cement, sand and water at low cost.

1 is a flowchart schematically showing a method for manufacturing a sidewalk block using coal ash and a shell according to an embodiment of the present invention.
Figure 2 is a conceptual diagram showing each step of the manufacturing method of the sidewalk block using coal ash and shell according to an embodiment of the present invention.

DETAILED DESCRIPTION The following detailed description of the invention refers to the accompanying drawings that show, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It is to be understood that the various embodiments of the invention are different, but need not be mutually exclusive. For example, certain shapes, structures, and characteristics described herein may be embodied in other embodiments without departing from the spirit and scope of the invention with respect to one embodiment. It is also to be understood that the position or arrangement of the individual components within each disclosed embodiment may be varied without departing from the spirit and scope of the invention. The following detailed description, therefore, is not to be taken in a limiting sense, and the scope of the present invention, if properly described, is defined only by the appended claims, along with the full range of equivalents to which such claims are entitled. In the drawings, like reference numerals refer to the same or similar functions throughout the several aspects, and length, area, thickness, and the like may be exaggerated for convenience.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily carry out the present invention.

In the following detailed description, as an example, a method of manufacturing a sidewalk block using the coal ash and shell of the present invention [particularly, mortar step] is used throughout the technical field to produce a sidewalk block by mixing coal ash and foundry sand, shell, cement and sand. Of course, the same technical configuration can be applied.

1 is a flowchart schematically showing a method for manufacturing a sidewalk block using coal ash and a shell according to an embodiment of the present invention.

Figure 2 is a conceptual diagram showing each step of the manufacturing method of the sidewalk block using coal ash and shell according to an embodiment of the present invention.

Referring to FIG. 2 in parallel, referring to FIG. 1, a salinity removing step (S100) for removing the salinity of the shell through washing, a crushing step (S200) for crushing the shell, and a total weight of 100 wt% , Waste coal ash: 13 to 20%, foundry sand: 13 to 20%, shell: 28 to 35% and the mortar step of kneading the mixture composed of the remaining sand and other unavoidable impurities including cement and water (S300); And it can be seen that it comprises a curing step (S400) for curing the mortar kneaded in the mortar step (S300).

Desalination step ( S100 )

The plurality of shells 110 are environmentally waste natural resources and all discarded clam shells, including oyster shells, are used after washing, crushing and drying shells in their natural state after eating oysters or clams.

The shell 110, the oysters and shells can be used to abbreviate or harvested offshore coast, a plurality of shells 110 may have a variety of forms depending on the size of the crushed.

In particular, the shell 110 is resistant to temperature changes, heat-resisting, heat-retaining function and moisture, it is possible to provide elasticity.

Here, the shell 110 may be placed in fresh water for 12 to 24 hours, or put in boiling water in order to remove the salt through the washer 210.

Then, in order to remove the foreign matter of the shell 110, it is subjected to a sintering process through a sintering step (S110) boiled in hot water for 1 hour to 2 hours at a temperature of 700 to 800 ℃ once again.

Grinding step ( S200 )

The shell 110, which has undergone the firing process through the firing step (S110), is dried at room temperature for 12 to 24 hours through a dryer 220, thereby enabling smooth grinding.

The step of crushing the shell 110 through the crusher 230 through the sintering step S110 is a crushing step S200.

Here, the moisture content of the shell 110 is less than 10% through the drying of the lung (110).

In this case, when the shell 110 is crushed, the shell 110 is preferably crushed to 0.1 to 3mm in size.

The shell 110, which is crushed to a uniform size of 0.1 to 3 mm, can be mixed with other materials smoothly.

When the crushed particles of the shell 110 are less than 0.1 mm, the particles are so small that the function of the shell 110 may be degraded, and the possibility of dust is increased.

When the crushed particles of the shell 110 exceeds 3 mm, the particles are so large that the mixing of the other material and the shell 110 may not be performed smoothly.

The shell 110 is made of powder through pulverization, it is possible to substitute the sand.

On the other hand, the coal ash 120 is preferably crushed to 0.1 to 3 mm in size.

The coal ash 120 pulverized to a uniform size of 0.1 to 3 mm, it is possible to smoothly mix with other materials.

When the pulverized particle of the coal ash 120 is less than 0.1 mm, the particles are too small, so that the function of the coal ash 120 may be reduced, and the possibility of dust is increased.

When the pulverized particles of the coal ash 120 exceeds 3 mm, the particles are so large that the mixing of other materials and the coal ash 120 may not be performed smoothly.

Mortar stage ( S300 )

% By weight, based on 100% by weight, waste coal ash: 13-20%, foundry sand: 13-20%, shell: 28-35%, and a mixture composed of the remaining sand and other unavoidable impurities including cement and water (30 ) Kneading process is a mortar step (S300).

At this time, the shell: the shell 110 at 28 to 35%, the one having a uniform particle of 0.1 to 3mm through the grinding step (S200).

Similarly, the coal ash 120 containing 13 to 20% is also used to have a uniform particle of 0.1 to 3mm through the grinding step (S200).

As such, the shell 110, the coal ash 120 and the foundry sand 130 are uniformly mixed with particles of 0.1 to 3 mm.

Then, sand and cement and other inevitable impurities including water are mixed in the mixture 30.

In such a mortar step (S300), it is to the strength% of the total strength 100%, waste coal ash and foundry sand and shells to share 70 to 80% of the strength, and sand and cement to share 20 to 30% of the strength desirable.

In the mortar step (S300), the shell 110, the coal ash 120, the foundry sand 130, sand, and cement are mixed to form a mixture 30.

In the mortar step (S300), the mixture 30 is smoothly mixed through the stirrer 240.

In this case, the compressive strength is lowered when the amount of the shell 110 mixed is less than 28%, and the density is lowered when the shell 110 exceeds 35%.

In addition, in 100% by weight, the density of the coal ash 120 and the foundry sand 130 is less than 13%, respectively, and the density is lowered, and when it exceeds 18%, the absorption rate is increased.

On the other hand, the curing step (S400), by pressing the mixture 30 in the set shape includes a molding step (S450) for molding into the sidewalk block (70).

Here, the mixture 30 is pressurized through the press press 250 to be formed into the sidewalk block 70 in the form required by the user.

At this time, in the forming step (S450), it is natural that the press block 70 can be molded in various forms.

In addition, the curing step (S400), and further comprises a plastic working step (S480) for plastic processing the sidewalk block 70 formed through the molding step (S450) at a temperature of 1100 to 1200 ℃.

Here, in the plastic processing step (S480), when the sidewalk block 70 is subjected to plastic processing at a temperature of less than 1100 ℃, the compressive strength of the sidewalk block 70 is lowered.

When the sidewalk block 70 is subjected to plastic working at a temperature exceeding 1200 ° C., the shrinkage ratio of the sidewalk block 70 is increased.

Example

Hereinafter, the configuration and operation of the present invention through the preferred embodiment 1 of the present invention will be described in more detail.

However, this is presented as a preferred example of the present invention, it should not be construed that the present invention is limited by this in any sense.

Details that are not described herein will be omitted since those skilled in the art can sufficiently infer technically.

Table 1 mixes the shell 110, the coal ash 120 and the foundry sand 130 (by weight to 100% by weight) in the sidewalk block 70, which is a preferred invention material of the present invention, but cement and sand And forming a mixture 30 in which water was mixed, and the changes in compressive strength (kg / cm 2), water absorption (%), and density (g / cm 3) were measured according to mixtures having different mixing ratios of materials.

Next, in Table 1, the compressive strength (kg / cm 2), absorption rate (%) and density (g //) of the sidewalk block 70 according to the mixing ratio of the shell 110 and the coal ash 120 and the foundry sand 130 were obtained. Change in cm 3) can be seen.

Example Shell (%) Coal Ash (%) Foundry sand (%) Compressive strength (㎏ / ㎠) Density (g / cm 3) Absorption rate (%) One 10 5 5 80 240 3 2 20 10 10 90 230 7 3 30 15 15 100 220 10 4 35 18 18 110 210 13 5 40 20 20 120 200 16

Referring to Table 1, 30% by weight of the shell 110, 15% of the coal ash 120, 15% of the foundry sand 130 to the total 100% by weight and inevitable with the remaining cement, sand and water When the impurities are mixed, the sidewalk block 70 exhibits excellent compressive strength (kg / cm 2), absorption (%), and density (g / cm 3).

Although the present invention has been described with reference to the embodiment shown in the drawings, this is merely exemplary, and may be applied to not only the sidewalk block 100 but also bricks and other building materials.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Those skilled in the art will appreciate that various modifications and changes may be made thereto without departing from the scope of the present invention.

Therefore, the spirit of the present invention should not be limited to the embodiments described above, and all of the equivalents or equivalents of the claims, as well as the appended claims, are included in the scope of the spirit of the present invention. I will say.

S100: salt removal step S110: firing step
S200: grinding step
S300: mortar stage
S400: curing step S450: molding step
S480: Plastic Processing Step
30: mixture 70: sidewalk block
110: shell 120: coal ash
130: Foundry sand
210: washing machine 220: dryer
230: grinder 240: stirrer
250: compression press

Claims (6)

Salinity removal step (S100) for removing the salt of the shell 110 by washing;
The shell 110 and a pulverizing step of grinding the coal ash 120 (S200);
% By weight, based on 100% by weight, waste coal ash: 13-20%, foundry sand: 13-20%, shell: 28-35%, and a mixture composed of the remaining sand and other unavoidable impurities including cement and water (30 Mortar step kneading (S300); And
Including the curing step (S400) for curing the mortar kneaded in the mortar step (S300),
The salt removal step (S100),
In order to remove the foreign substances of the shell 110, and to crush the shell 110 at a temperature of 700 to 800 ℃ for 1 hour to 2 hours, and a baking step (S110),
The curing step (S400),
Forming step (S450) for pressing the mixture 30 to a predetermined shape to form a sidewalk block (70); And
Method for producing a sidewalk block using coal ash and shell comprising a plastic working step (S480) for plastically processing the sidewalk block 70 formed through the molding step (S450) at a temperature of 1100 to 1200 ℃.
delete The method of claim 1,
In the grinding step (S200),
The shell 110 and the coal ash 120 is a method for producing a sidewalk block using coal ash and shells that are crushed to a size of 0.1 to 3 mm.
The method of claim 1,
In the mortar step (S300),
A method for producing a sidewalk block using coal ash and shells in which the waste coal ash, foundry sand and shells share 70 to 80% of the strength, and the sand and cement share 20 to 30% of the strength, in strength% relative to 100% total strength.
delete delete

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