JPH10258407A - Concrete product and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a concrete product by which a natural landscape is not damaged and added value is raised. SOLUTION: In a method for producing a concrete product, a body 10 is formed into a prescribed shape by using concrete in which fine aggregate and coarse aggregate are used for aggregate. A surface layer part 12 of a part exposed to the outside after construction is integrally formed onto the body 10 by using an aggregate different from the above-mentioned aggregate. Material obtained by crushing a plurality of kinds of natural stones having different colors is used as the aggregate constituting the surface layer part 12. Cement and water are added to every natural stone material and the mixture is kneaded to form a kneaded material. A pattern is formed by the kneaded material and poured in a vessel 18 such as a pallet. The kneaded material poured into the vessel 18 is fitted to the body 10 to unify the body 10 and the surface layer part 12. Thereafter, blasting treatment for removing the paste material of the above-mentioned kneaded material is applied to the outer face of the surface layer part 12. A pattern and a figure formed by the hue of the natural stone material are shown on the outer face of the surface layer part 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete product used for civil engineering construction such as revetment and retaining wall construction or general construction, and a method for producing the same.

[0002]

2. Description of the Related Art In the field of civil engineering or general construction, there are a great variety of concrete such as concrete masonry blocks used for revetment work, L-shaped retaining wall blocks used for construction work, and sidewalk road boundary blocks used for road construction. The product is being used. These concrete products are produced in a factory in advance according to predetermined shapes and dimensions, and these are combined at a construction site to form a retaining wall or the like.

[0003] Methods for producing these concrete products include a method in which concrete is poured into a mold and solidified, and then the mold is removed to form a predetermined shape. There is a method of separately forming a surface that appears to the outside after construction with this main body. Such a manufacturing method using a concrete block is performed because the concrete of slump 0 used for forming the main body has a rough surface and the finished appearance is not good as it is, so the surface portion is made of mortar using fine aggregate. This is because a smooth outer surface can be obtained by forming the above.

[0004]

As described above, various concrete products have been used in various fields in civil engineering and construction work. However, all of these concrete products have a grayish white peculiar to concrete, and at the place where they are installed, they show a very uniform and artificial landscape, so landscapes that are closer to nature without spoiling the natural landscape Concrete products that do not impair the natural scenery in harmony with nature or the nature of construction have come to be required.

For example, in a concrete block,
Blocks with uneven surfaces, exposed natural stones, combinations of uneven patterns or combinations of multiple forms of blocks that express a more natural form as a whole, vegetation such as grass And the like are considered to provide a natural appearance. However, even in the case of such a concrete product, it is inevitable that its appearance becomes grayish white, and there is a certain limit in terms of improving the natural scenery. In addition, as a method of coloring a concrete product to a color other than the usual grayish white color, in addition to coloring the outer surface of the concrete product, there is also a method of molding by mixing a color powder of a specific color into the aggregate, but color powder is used. The resulting product has a problem that the color fades due to external influences.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the conventional concrete products, and an object of the present invention is to provide a concrete product having a color different from the grayish white which is a normal appearance color of the concrete product. It is possible to provide a high value-added concrete product, and to provide a suitable manufacturing method of these concrete products. .

[0007]

The present invention has the following arrangement to achieve the above object. That is, a concrete product obtained by integrally forming a surface layer portion using a natural stone material different from the above-mentioned aggregate on a concrete body preformed using fine aggregate and coarse aggregate as the aggregate. In the present invention, stone powder obtained by crushing natural stone having a color tone different from that of cement is used as the natural stone material forming the surface layer portion, and the color tone of the natural stone material is presented on the outer surface of the surface layer portion. I do. Further, a mixture of a plurality of types of natural stone materials having different colors is used as the stone powder. Further, in a concrete product formed by integrally forming a surface layer portion using a different kind of aggregate from a concrete main body formed in advance using a fine aggregate and a coarse aggregate as an aggregate, A material obtained by crushing a plurality of types of natural stones having different colors is used as an aggregate forming the surface layer portion, and a pattern or a graphic according to the color tone of the natural stone material is displayed on the outer surface of the surface layer portion. Features.

Also, in a concrete product obtained by adding concrete and water to an aggregate and mixing and kneading the concrete, the concrete is poured into a mold and solidified, and natural stone having a color tone different from the cement color is crushed as the aggregate. One or more types of stone powder are used, and the color tone of the natural stone material is provided on the outer surface. Further, in a concrete product in which concrete kneaded by adding cement and water to an aggregate is poured into a mold and solidified, as the aggregate, a material obtained by crushing a plurality of types of natural stones having different colors is used, The kneaded material kneaded for each natural stone material is filled in the mold and solidified, and a pattern or a graphic according to the color tone of the natural stone material is presented on the outer surface. Note that, as the natural stone, tribite, marble, pyroxene, and granite can be preferably used.

In addition, a surface portion exposed to the outside after construction is formed of a natural stone material different from the above-mentioned aggregate on a main body formed into a predetermined shape using concrete using fine aggregate and coarse aggregate as the aggregate. In the method for producing a concrete product integrally formed by using, as a natural stone material forming the surface layer portion, a stone powder obtained by crushing natural stone having a color tone different from a cement color is used, and cement and water are added to the stone powder and kneaded. The kneaded material is applied to the surface layer portion of the main body to integrate the main body and the surface layer portion, and the outer surface of the surface layer portion is subjected to a blast treatment for removing a paste component of the kneaded material, and the outer surface of the surface layer portion is subjected to blast processing. The color tone of the natural stone material is presented. In addition, the surface layer portion of the portion exposed to the outside after construction is integrally formed with a main body formed into a predetermined shape using concrete using fine aggregate and coarse aggregate as an aggregate using an aggregate different from the aggregate. In the method for producing a concrete product to be formed, a material obtained by crushing a plurality of types of natural stones having different colors as an aggregate constituting the surface layer portion, and kneading by adding cement and water for each natural stone material After preparing a product, forming a pattern with the kneaded material in a container such as a pallet and injecting the same, applying the kneaded material injected into the container to the main body to integrate the main body and the surface layer portion, The outer surface of the surface layer portion is subjected to a blast treatment for removing a paste component of the kneaded material, so that a pattern or a graphic according to the color tone of the natural stone material is presented on the outer surface of the surface layer portion.

Further, in a method for producing a concrete product, in which concrete obtained by adding cement and water to an aggregate is poured into a mold and solidified, natural stone having a color tone different from the cement color is used as the aggregate. Using one or more kinds of crushed stone powder, adding concrete and water to the stone powder, kneading the concrete, filling the mold and molding, and then blasting the outer surface of the molded product to form a paste of the concrete. The color tone of the natural stone material is presented on the outer surface of the molded product by removing the component.
Further, in a method for producing a concrete product, in which concrete kneaded by adding cement and water to an aggregate is poured into a mold and solidified, a plurality of types of natural stones having different colors are used as the aggregate. Cement and water are added to each aggregate and kneaded to produce separate concrete, and the formwork is filled with concrete prepared for each aggregate from a separate injection port and molded. A blasting treatment is carried out to remove the concrete paste, thereby presenting a pattern or a figure according to the color tone of the natural stone material on the outer surface of the molded product.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below. 1 and 2 show a front view and a side sectional view of a concrete block, which is an embodiment of a concrete product according to the present invention. The concrete block of the present embodiment is formed in a block shape having a rectangular front surface, and similarly to a conventional concrete block, a main body 10 formed to a required strength using fine aggregate and coarse aggregate. And the surface layer portion 12 exposed to the outside after construction
Are integrally formed.

The concrete masonry block of the present embodiment uses two or more natural stones (natural natural stones) exhibiting a specific color as an aggregate constituting the surface layer portion 12, and the color of the natural stone itself is provided on the outer surface of the surface layer portion 12. Is used to represent the pattern. The example shown in FIG. 1 is an example in which a pattern is expressed on the outer surface of a concrete block using two types of natural stones having different colors. In FIG. 1, part A is a part in which one natural stone 14 is used as an aggregate, and part B is a part in which the other natural stone 16 is used as an aggregate.

FIG. 3 is an enlarged view of the vicinity of the surface layer portion 12 of the concrete block. The surface layer portion 12 is integrated with the main body 10 as shown in the figure, and covers a portion exposed to the outside when the concrete block is constructed. Surface part 1
The natural stone used in 2 is a concrete block crushed to about 30 mm or less. The degree of the crushing is not particularly limited.

A method of forming the surface layer portion 12 using different types of natural stones as an aggregate in the example of a concrete building block will be described later. A feature of the concrete building block of the present embodiment is that two types of natural stones are homogeneous. Instead of being mixed with each other, it is divided into regions for each aggregate of each natural stone, and is thereby expressed in a pattern. The type of natural stone used to present such a pattern on the surface of the concrete block is not limited as long as it is a natural stone having a color different from that of a conventional gray-white concrete product. However, if natural stones with a clear color are used, the pattern can be clearly expressed, and the product can be provided as a product having characteristics different from the conventional one.

An example of a natural stone that is useful because it has a characteristic color as an aggregate constituting the surface layer portion 12 of the concrete masonry block is, for example, samba stone. Sanbashi is a metamorphic rock from Gunma Prefecture that has a primary color of green and a primary color of red. Also, marble is useful as a material having a white color. Marble is also called crystalline limestone, and its main color is white. Examples of the brown color include pyroxene. The main color of pyroxene is brown or yellowish brown from Nagano Prefecture. Granite is a mixture of blackish primary colors and white and red spots.

The concrete block shown in the illustrated example is an example in which two types of natural stones are used as an aggregate to present a pattern on the outer surface. Of course, three or more types of natural stones are used as an aggregate to form a pattern. Can also be expressed. In this case as well, similar to the concrete block described above, instead of using aggregates of each natural stone uniformly and using them, a pattern is presented so that the area is divided for each aggregate of each natural stone. Is the feature. Of course, it is also possible to use one kind of natural stone to provide it as a concrete product having a color tone and texture peculiar to natural stone that cannot be obtained with conventional concrete products.

FIG. 4 is an explanatory view showing a method of manufacturing the concrete block. Hereinafter, description will be made with reference to this manufacturing process diagram. The method for manufacturing a concrete building block according to the present embodiment is basically the same as the conventional method for manufacturing a concrete building block, in which a surface layer portion 12 formed separately from a main body 10 formed into a predetermined shape is integrated. Formed by

The concrete building block main body 10 is manufactured by filling a molding die with concrete kneaded by adding water and an admixture to cement, fine aggregate, and coarse aggregate, and then punching out the die. Use concrete with 0 slump. The mixing ratio of the concrete (per 1 m ³ ) is, for example, as follows. Water: 110 kg (4.6%), cement: 259 kg (10.9%), fine aggregate: 1056 kg (4
4.4%), coarse aggregate: 953 kg (40.1%), admixture: 1.0
4 kg (0.04%). The fine aggregate is about 0.15 to 5 mm, and the coarse aggregate is about 5 to 20 mm. Since the main body 10 is made of 0-slump concrete, when the molding die is filled with concrete and the molding is completed, the mold can be cut out and sequentially moved to the next step.

The surface layer portion 12 is manufactured in a step different from that of the main body 10. As described above, in this embodiment, two types of natural stones of different types are used as aggregates constituting the surface layer portion 12. These natural stones are crushed to a predetermined size in advance and kneaded separately to prepare a kneaded material. Natural stones are used by mixing coarsely crushed and finely crushed stones in an appropriate ratio. Usually, the composition of coarsely crushed natural stone aggregate and finely crushed natural stone aggregate is 1: 6 by weight ratio.
Degree. Here, the coarsely crushed aggregate is 5 to 30 m.
0.15 to 5m with finely crushed aggregate
The size is about m.

In FIG. 4, the natural stone aggregate A is the one obtained by roughly crushing one natural stone A, and the fine aggregate is the aggregate obtained by finely crushing the natural stone A. Natural stone aggregate B is obtained by roughly crushing the other natural stone B, and fine aggregate is obtained by crushing natural stone B finely. Cement and water are added to these natural stone aggregates and kneaded to produce a kneaded product. In the embodiment, these composition ratios by weight are cement: 16.7%, natural stone aggregate: 66.5%, water: 16.5%.
8%. The composition ratio of the natural stone aggregate is the sum of coarsely crushed and finely crushed.

In order to integrate the main body 10 and the surface layer portion 12, a kneaded material using the natural stones A and B as an aggregate is filled in a pallet 18 to a thickness of about 1 to 2 cm, and the concrete stacking block previously prepared is prepared. The main body 10 is placed on the pallet 18 with its front side facing downward, and the whole of the pallet 18 and the main body 10 are vibrated so that the surface of the main body 10 is well kneaded with the kneaded material. Since the main body 10 is made of 0-slump concrete, the surface is porous, and the kneaded material partially penetrates into the surface of the main body 10 due to the vibration and the compression action. Are integrated (combined).

After the main body 10 and the kneaded material are well mixed,
After curing for a certain period of time under high temperature and high humidity conditions, the main body 10 and the surface layer portion 12 are completely integrated, and the pallet 18 is removed. After the curing is completed, the surface of the surface layer portion 12 is subjected to a blast treatment to remove and remove the cement (paste component) adhering to the surface. This blasting process is performed on the surface
In the solidified state, the surface is covered with an off-white paste, so this paste is removed to make the natural color of the natural stone aggregate appear. The pattern appears beautifully. In this way, a finished concrete block is obtained.

By the way, in the above-mentioned manufacturing process, in order to make the surface layer portion 12 express a pattern, when the pallet 18 is filled with the kneaded material of natural stone aggregate, the kneaded materials of different types are not mixed homogeneously. It is important to. That is, when filling the pallet 18 with the kneaded material, it is necessary to fill the pallet 18 with a different kind of kneaded material so as to draw a pattern.
FIG. 5 shows a method of filling the pallet 18 with different kinds of kneaded materials. In the figure, reference numerals 20a and 20b denote mixers for adding aggregates of natural stones A and B to produce a kneaded material. The natural stones A and B are separately kneaded by the mixers 20a and 20b, and are transported to separate pumping machines 22a and 22b, respectively. The pumps 22a and 22b are connected to an injection device 24, and the injection device 24 is provided with injection ports 26a and 26b for injecting the kneaded materials of the natural stones A and B into the pallet 18.

The injection device 24 also serves as a handle, and can freely move the injection ports 26a and 26b above the pallet 18. Thus, while moving the injection device 24 with respect to the pallet 18, the injection ports 26a,
By filling different kinds of kneaded materials into the pallet 18 from 6b, the different kinds of kneaded materials can be sorted and filled into the pallet 18 without being mixed. When injecting the kneaded material, it is possible to freely operate the injecting device 24 and inject the kneaded material to express various patterns. When injecting the kneaded material, different kinds of kneaded materials can be simultaneously injected, or after injecting one kneaded material, the other kneaded material can be injected.

When three or more natural stone aggregates are used,
Similarly, an injection port is provided for each kneaded material of different types of natural stones, and a pattern can be expressed by injecting the kneaded material from the respective injection ports into the pallet 18. 6 and 7 show examples of products in which a specific pattern is presented on a concrete stacking block. FIG. 6 is an example of a concrete building block in which a corrugation is expressed on the surface layer portion 12, and a characteristic composition as a whole is expressed by constructing these concrete building blocks in combination. By controlling the movement of the pouring device 24 and the pouring ports 26a, 26b, it is possible to mass-produce concrete building blocks having such a specific pattern.

FIG. 7 shows an example of construction using a concrete stacking block expressing a bamboo leaf pattern on the surface layer portion 12.
When filling the pallet 18 with the kneaded material, it is possible to express such a specific form of a natural product by a method of placing a mold and filling. As described above, the method of manufacturing a concrete building block showing a pattern on the surface portion using natural stone having a specific color as an aggregate is not particularly limited to the types of natural stone that can be used for the kneaded material. Since natural stones having various colors can be used, there is an advantage that extremely various expressions can be made in accordance with the form of the pattern.

In the above embodiment, a pattern is presented on the surface of a concrete product using a plurality of types of natural stones. One type of natural stone is used as a material of a surface layer portion, and a predetermined strength is maintained. It is also possible to make a product by integrating with the main body to be manufactured. Also in this case, as in the above-described embodiment, natural stone is crushed into an aggregate, the kneaded material kneaded by adding cement and water is blended with the main body, and after integration, the cement adhering to the surface is (Paste portion) is formed by peeling off.

In the case of a concrete product using natural stone, it is important to make the color tone and texture peculiar to natural stone clearly appear on the surface of the product. For that purpose, a material (10 μm
It is effective to use a particle size of about 0.15 mm). The use of finely crushed natural stone (stone powder) makes the appearance of the product uniform in color, and the blasting treatment removes the cement content on the surface, so that the color peculiar to the natural stone comes out well.

When the surface layer of a product is formed using natural stone, the surface of the product is colored by a color peculiar to the natural stone, so that the product can be obtained as a characteristic product that cannot be obtained with ordinary concrete products. It can be provided as a product that expresses natural colors and is in harmony with the natural landscape. The product obtained by this method is different from the product colored on the outer surface of the concrete product or the product colored by using color powder.It is a product with a more natural color tone and the color is affected by external influences such as ultraviolet rays and wind and rain. Has the characteristic that it does not fade or peel off. According to the present method, it is possible to provide concrete products of various colors by using natural stones having various colors. In some cases, in addition to using a single color tone, it is also possible to present an intermediate color by mixing a plurality of types of natural stone materials having different color tones.

Although the above embodiment is an example of manufacturing a concrete pile block, an L-shaped retaining wall block or a pedestrian road boundary block manufactured by pouring concrete into a formwork similarly has a natural color having a unique color. By using stone as an aggregate, it is possible to provide a product having a pattern displayed on the outer surface. FIG. 8 is a front view and a side view of the L-shaped retaining wall block 30. This L-shaped retaining wall block is a product using ordinary concrete. However, in order to express a pattern on the outer surface using natural stone as an aggregate, natural stones A and B having different colors are used as an aggregate as shown in FIG. It can be manufactured by a method in which the kneaded material (concrete) thus filled is filled into a mold and solidified.

FIG. 10 shows a process of manufacturing a concrete product by pouring different types of concrete using natural stones A and B as aggregates into a formwork. The natural stone aggregates A and B are made of coarse aggregate obtained by coarsely crushing natural stones A and B and fine aggregate obtained by finely crushing natural stones A and B, respectively.
Water and an admixture are added and kneaded to produce concrete for filling the formwork. As the composition of the concrete, for example, cement: 13%, natural stone aggregate (coarse aggregate: 4)
3.8%, fine aggregate: 35%), water: 7.8%, admixture:
0.4%. This concrete is slump 15-2
0 means that there is fluidity.

These concretes are filled in a formwork and L
The mold retaining wall block 30 is formed. When filling the form, the concrete with the natural stone aggregate A and the concrete with the natural stone aggregate B are filled into the form from separate injection ports,
Ensure that concrete does not mix homogeneously in the formwork. When the concrete is poured into the formwork, the natural stone A and the natural stone B concrete are mixed to some extent due to the fluidity of the concrete.
It is possible to secure a region in which separate aggregates are separated to some extent in the mold.

FIG. 9 shows a method of injecting concrete using the aggregate of natural stone A and concrete using the aggregate of natural stone B from each of the two inlets in the L-shaped retaining wall block.
FIG. 9A shows an example in which a pattern of natural stones A and B appears when the L-shaped retaining wall block is viewed from the front.
FIG. 9B is an example in which a pattern of natural stones A and B appears when the L-shaped retaining wall block is viewed from the side. In the figure, depending on the concrete pouring condition,
This shows how the pattern fluctuates. In the case where concrete is poured into a formwork and manufactured, it is difficult to represent a uniform pattern like the above-described concrete building block due to the fluidity of the concrete.

As shown in FIG. 10, after the concrete is poured into the mold, the mold is held as it is, cured for a certain period of time, solidified, and then removed from the mold (demolding). Since the paste has adhered to the surface of the concrete in the state after solidification, blasting is performed to remove and remove the paste on the surface of the concrete. By removing the paste, the color peculiar to the natural stone aggregate is clearly shown on the surface of the product, and a concrete product having a pattern of the natural stone aggregate of a different color is obtained.

In the case of a concrete product manufactured by pouring concrete into a mold as described above, natural stone having a specific color is used as an aggregate to provide a product having various unusual patterns on the surface. Becomes possible. Further, unlike the above-described embodiment, it is also possible to fill a concrete frame using a single type of natural stone material as an aggregate into a mold and form the concrete. By molding using a natural stone material of a specific color and removing the paste by blasting the outer surface of the molded product in the same manner as in the above-described embodiment, it is possible to provide a product having a color tone unique to the natural stone material. it can.

Even when a single natural stone material is used, by using the stone powder obtained by pulverizing the natural stone material as an aggregate as described above, the color tone peculiar to the natural stone material is easily displayed on the outer surface of the product. Is expressed as a uniform color tone. Also,
In some cases, a mixture of a plurality of types of natural stone materials can be used to express an intermediate color. Molded products using stone powder can be effectively used for small products such as paving stones.

These concrete products are different from mere uniform gray-white products such as conventional concrete products, and are products having a specific pattern and color. Therefore, concrete products used in revetment works, road works, etc. In this case, it is possible to provide a structure that is more natural and does not impair the natural landscape.

Natural stones are extremely diverse in color tone and the like, and can be easily provided as a product having a color or a pattern according to a construction site, and should be provided as a product which is easy to use and excellent in quality. Becomes possible. In the above description, some examples of concrete products have been described. However, the method of the present invention can be applied not only to the above-described embodiment but also to concrete products of various shapes and dimensions in exactly the same manner. Yes, its use is not particularly limited.

[0039]

The concrete product according to the present invention uses natural stone having a unique color tone as a material,
Since it is provided as a product having a natural color tone and a unique pattern and color not found in conventional concrete products, it can be used as a more natural structure without impairing the natural landscape. Further, since the appearance can be expressed in various ways, it can be used for various purposes. Further, according to the method for manufacturing a concrete product according to the present invention, it is possible to easily produce a high-product-value concrete product using a natural stone material.

[Brief description of the drawings]

FIG. 1 is a front view of a concrete building block according to the present invention.

FIG. 2 is a side sectional view of a concrete building block according to the present invention.

FIG. 3 is an enlarged sectional view showing the vicinity of the surface of a concrete stacking block.

FIG. 4 is an explanatory view showing a manufacturing process of the concrete stacking block.

FIG. 5 is an explanatory view showing a method for manufacturing a concrete stacking block.

FIG. 6 is an explanatory view showing a construction example of a concrete stacking block.

FIG. 7 is an explanatory view showing another example of construction of a concrete stacking block.

FIG. 8 is a front view and a side view of the L-shaped retaining wall block.

FIG. 9 is an explanatory view showing a method of manufacturing an L-shaped retaining wall block.

FIG. 10 is an explanatory diagram showing a manufacturing process of the L-shaped retaining wall block.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Main body 12 Surface part 14 Natural stone (aggregate) 16 Natural stone (aggregate) 18 Pallet 20a, 20b Mixer 22a, 22b Pumping machine 24 Injection device 26a, 26b Injection port 30 L type retaining wall block

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Hideyuki Maruyama 4047, Akase, Kaise, Sakucho, Minamisaku-gun, Nagano Prefecture Inside Karuizawa Concrete Co., Ltd. 4047 Karuizawa Concrete Co., Ltd. (72) Inventor Kenyoshi Akaoka 4047 Karasezawa Concrete Co., Ltd.

Claims (10)

[Claims] 1. A concrete body formed in advance using fine aggregate and coarse aggregate as an aggregate, and a surface layer portion integrally formed by using a natural stone material different from the aggregate. In the concrete product, a stone powder obtained by crushing natural stone having a color tone different from a cement color is used as a natural stone material forming the surface layer portion, and the color tone of the natural stone material is presented on an outer surface of the surface layer portion. A concrete product characterized by: 2. The concrete product according to claim 1, wherein a mixture of plural kinds of natural stone materials having different colors is used as said stone powder. 3. A concrete body formed in advance using fine aggregate and coarse aggregate as an aggregate, and a surface layer portion integrally formed using an aggregate different from the aggregate. In the concrete product, a material obtained by crushing a plurality of types of natural stones having different colors is used as an aggregate constituting the surface layer portion, and a pattern or a graphic according to the color tone of the natural stone material is presented on the outer surface of the surface layer portion. A concrete product characterized by being formed. 4. A concrete product obtained by adding concrete and water to an aggregate and mixing and kneading the concrete into a mold and solidifying the concrete, wherein the aggregate is formed by crushing natural stone having a color tone different from the cement color. A concrete product characterized by using one or more kinds of stone powder, and presenting a color tone of the natural stone material on an outer surface. 5. A concrete product obtained by adding concrete and water to an aggregate and mixing and kneading the concrete into a mold to solidify the aggregate, wherein the aggregate is obtained by crushing a plurality of types of natural stones having different colors. A concrete product, wherein a kneaded material that is used and kneaded for each natural stone material is filled in the mold and solidified, and a pattern or graphic according to the color tone of the natural stone material is presented on an outer surface. 6. The method according to claim 1, wherein said natural stone is a sambalite, a marble, a pyroxene, or a granite.
The concrete product according to 2, 3, 4 or 5. 7. A main body formed into a predetermined shape using concrete in which fine aggregate and coarse aggregate are used as an aggregate, and a surface layer exposed to the outside after construction is made of a natural stone material different from the aggregate. In the method of manufacturing a concrete product integrally formed using, using a stone powder crushed natural stone having a color tone different from the cement color as a natural stone material forming the surface layer portion,
A blast for adding a cement and water to the stone powder and kneading the mixture to adhere to the surface layer portion of the main body to integrate the main body and the surface layer portion, and to remove a paste component of the kneaded material on the outer surface of the surface layer portion A method for producing a concrete product, comprising: performing a treatment so as to present the color tone of the natural stone material on the outer surface of the surface layer portion. 8. A main body formed into a predetermined shape using concrete in which fine aggregate and coarse aggregate are used as an aggregate, and a surface layer portion that is exposed to the outside after construction is made of an aggregate different from the aggregate. In the method of manufacturing a concrete product integrally formed using, using a material obtained by crushing a plurality of types of natural stones having different colors as an aggregate constituting the surface portion, adding cement and water for each natural stone material A kneaded material is prepared, a pattern is formed from the kneaded material into a container such as a pallet, and the mixture is injected. The kneaded material injected into the container is adhered to the main body to integrate the main body and a surface layer portion. After that, the outer surface of the surface layer portion is subjected to a blasting treatment for removing a paste component of the kneaded material, and a pattern and a graphic according to the color tone of the natural stone material are presented on the outer surface of the surface layer portion, wherein the concrete is characterized in that Method of manufacturing the goods. 9. A method for manufacturing a concrete product, comprising adding concrete and water to an aggregate and mixing and kneading the concrete, pouring the mixture into a mold, and solidifying the concrete. As the aggregate, natural stone having a color tone different from the cement color is used. Using one or more kinds of crushed stone powder, adding concrete and water to the stone powder, kneading the concrete, filling the mold and molding, and blasting the outer surface of the molded product to form a paste of the concrete. A method for producing a concrete product, characterized by presenting a color tone of the natural stone material on the outer surface of a molded product by removing the component. 10. A method for producing a concrete product, wherein concrete obtained by adding cement and water to an aggregate is poured into a mold and solidified, wherein a plurality of types of natural stones having different colors are used as the aggregate. Then, cement and water are added to each of the aggregates and kneaded to produce separate concrete, and the concrete formed for each of the aggregates is filled into the formwork from a separate injection port and molded. A method for producing a concrete product, characterized in that a blast treatment is performed on an outer surface of the above to remove the paste of the concrete, so that a pattern or a graphic according to the color tone of the natural stone material is presented on the outer surface of the molded product.