JP2010275155A - Concrete composition, concrete structure and block for fish reef or spawning reef - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a concrete composition which enables a hardened concrete body having strength more excellent than that of the conventional hardened concrete body to be formed in spite of using solid waste as an aggregate. <P>SOLUTION: The concrete composition contains: cement; a coarse aggregate composed of one or more kinds of crushed matters selected from among shells, waste plastics, rubber waste, metal waste, glass waste, concrete waste, ceramic waste and rubble; a fine aggregate obtained by making one or more kinds selected from among coal ash, by-produced gypsum, incineration ash, cinders, dust, soot and dust, sludges, waste dumps and waste sand harmless; one or more kinds of blending materials selected from among blast furnace slag fine powder, fly ash, clinker ash and silica fume; and a reinforcement fiber selected from a glass fiber and a carbon fiber. By producing a block 10 for fish reefs from the concrete composition, the strength of the block 10 for fish reefs is improved by the reinforcement fiber in the concrete composition. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a concrete composition, a concrete structure, and a block for fish reef or laying reef using industrial waste as an aggregate.

  Conventionally, a technique has been proposed in which solid waste is pulverized and blended as an aggregate in a concrete composition (see, for example, Patent Document 1). It has also been proposed to produce reef blocks with such a concrete composition. By using such technology, it was possible to reuse the waste.

JP 2003-165754 A

  However, as in the concrete composition described in Patent Document 1, when waste is used as an aggregate, the strength of the concrete structure finally obtained satisfies the standard defined in the Japanese Industrial Standard (JIS standard). And sometimes it cannot be high enough. Specifically, for example, when there is a relatively large amount of rapidly deteriorating concrete waste that is dismantled beyond the useful life contained in the aggregate, the strength of the concrete structure that is finally obtained decreases. Tend to.

Therefore, when manufacturing a concrete structure requiring sufficiently high strength, there is a problem that it is difficult to use a concrete composition containing aggregate derived from waste.
The present invention has been made in order to solve the above problems, and its purpose is to provide a hardened concrete body that is superior in strength to conventional products, despite using solid waste as an aggregate. It is to provide a formable concrete composition.

Hereinafter, the configuration adopted to achieve the above object in the present invention will be described.
The concrete composition of the present invention is obtained by crushing cement and at least one selected from shells, waste plastics, rubber scraps, metal scraps, glass scraps, concrete scraps, ceramic scraps, and rubbles. Coarse aggregate made of crushed material and at least one fine aggregate selected from coal ash, by-product gypsum, incinerated ash, cinder, dust, dust, sludge, waste soil, and waste sand And at least one admixture selected from among blast furnace slag fine powder, fly ash, clinker ash, and silica fume, and at least one reinforcing fiber selected from glass fiber and carbon fiber, To do.

  If such a concrete composition is cured to produce a hardened concrete body, the strength of the hardened concrete body can satisfy the standard defined in the JIS standard by the reinforcing fibers contained in the concrete composition. Therefore, aggregates that cause a decrease in the strength of the hardened concrete (for example, severely deteriorated concrete scraps that are dismantled and discarded beyond their useful lives, or aggregates derived from concrete scraps that have deteriorated due to salt damage or cold) Even if it is contained in a relatively large amount, the strength of the concrete hardened body finally obtained is higher than that of conventional concrete products that do not contain reinforcing fibers, not only meeting the JIS standard but also stipulated in the JIS standard. It is possible to provide a concrete product with much superior strength compared to the minimum standard value.

  In addition, the concrete composition of the present invention can be used for producing various concrete products. Specific examples include fish reef blocks, laying reef blocks, wave-dissipating blocks, artificial submarine mountain range building blocks, piers. It can be used as various other construction materials and harbor civil engineering materials.

  In order to manufacture these concrete products, a concrete product may be manufactured using the concrete composition of the present invention in a factory or the like, or a concrete product may be manufactured by on-site construction.

  As an example of on-site construction, for example, this concrete composition is sprayed on the slope of the mountain surface, and concrete coating for preventing collapse is applied, or it is sprayed on the surface of an aged flat roof for waterproofing measures. Examples of construction such as concrete coating can be given.

  By the way, some crushed materials crushed for use as coarse aggregates have a sharp shape, such as glass and ceramics. Therefore, when using such coarse aggregate as it is, in order to prevent the pointed part from being exposed to the outer surface of the hardened concrete body, or the pointed aggregate due to damage after installation, etc. It is necessary to take measures such as adding a coating layer to the outer surface of the hardened concrete.

  In that regard, in the concrete composition of the present invention, when the crushed material is agitated with an abrasive and the chamfered corners of the crushed material are used as the coarse aggregate, a sharp aggregate is included. Like a concrete structure, the sharp part of aggregate is not exposed to the outer surface.

Therefore, if it is such a concrete composition, it is not necessary to implement the measure which does not expose the pointed part of aggregate like the past.
Next, the concrete structure of the present invention includes a base formed by curing the concrete composition of the present invention, and a first coating layer formed by curing cement to which carbon fiber is added and covering the base. It is characterized by that.

  With such a concrete structure, the carbon fiber is exposed on the surface of the coating layer, so when used as a block for fish reefs or laying reefs, conventional concrete not coated with cement containing carbon fibers Compared to the product, algae adheres to the carbon fiber exposed on the surface at an early stage and settles as it is. Therefore, algae can be promoted in a short period of time compared to conventional concrete products. In addition, since seaweed spores, seafood eggs, coral polyps, and the like adhere to the carbon fibers on the block surface, growth of seagrass, seafood, and corals can be expected to be promoted.

  Moreover, when such a concrete structure is installed in the sea and river which became dirty with sludge, sludge gets entangled in the carbon fiber on the surface. Therefore, it is possible to purify the water quality of the sea and rivers by removing the sludge by pulling up the hardened concrete in a state where the sludge is tangled in this way from the water.

  Further, the concrete structure of the present invention comprises a base formed by curing the concrete composition of the present invention, and fish meal, calcium carbonate, nitrogenous fertilizer, phosphate fertilizer, siliceous fertilizer, vitamins, and mineral components. Of these, a cement to which at least one is added is hardened and includes a second coating layer that covers the base.

  If it is such a concrete structure, when used as a block for fish reef or spawning reef, fish meal, calcium carbonate, nitrogenous fertilizer, phosphate fertilizer, siliceous fertilizer contained in the second coating layer, Vitamins and minerals are eluted into the river or sea. In this way, fish meal and the like dissolved into water become fish and plankton feed, seaweed nutrients, and the like. Therefore, compared to conventional products that do not contain fish meal etc., it can promote the propagation of seagrass and plankton, and marine organisms that prey on these also gather, so it functions effectively as a place of habitat or spawning for seafood be able to.

(A) is a figure which shows the outline of the chamfering processing apparatus demonstrated in 1st Embodiment, (b) is a figure which shows a chamfering machine. (A) is a figure which shows the block for fish reef in 1st Embodiment, (b), (c), and (d) are figures which show the block unit for fish reef, The top view, a front view, It is a bottom view. (A) is sectional drawing which shows the block for fish reefs in 2nd Embodiment, (b) is sectional drawing which shows the block for fish reefs in 3rd Embodiment. It is a figure which shows the block for fish reefs demonstrated as other embodiment, (a) is the perspective view, (b) is the top view, (c) is the front view. It is a figure which shows the block for fish reefs demonstrated as other embodiment, (a) is the perspective view, (b) is the top view, (c) is the front view, (d) is a figure which shows a shellfish reef roll It is. It is a figure which shows the block for fish reefs demonstrated as other embodiment, (a) is the perspective view, (b) is the enlarged view of the surface, (c) is the enlarged view of the cross section. (A)-(h) is a figure which shows the abrasives demonstrated in other embodiment.

Next, embodiments of the present invention will be described with some specific examples.
[First Embodiment]
1st Embodiment demonstrates the example which manufactures the block for fish reef using the concrete composition of this invention.

The concrete composition used in the first embodiment is a mixture of cement, coarse aggregate, fine aggregate, concrete admixture, and reinforcing fibers.
Among these, as cement, taking into account the use of fish reef, the one with high safety to living body (specifically, composed of the same composition component as the cement component used in dental treatment) is used. Yes.

  Coarse aggregates are shells, waste plastics, rubber scraps, metal scraps, glass scraps, concrete scraps, ceramic scraps, and rubbles. And what chamfered the crushed material is used.

  In the JIS standard, the coarse aggregate is defined as “aggregate with a mass of 85% or more on a 5 mm screen (JIS A 0203)”. In this embodiment, the raw materials are also compliant with the JIS standard. The size is crushed and classified by sieving.

  Fine aggregates include coal ash, by-product gypsum, incinerated ash, cinder, dust, dust, sludge (eg, sludge generated naturally such as sewage, lakes, rivers, harbor sludge, paper sludge, abrasive sludge, etc.) There are generation type sludges, construction sludges, etc.), waste residual soil, and waste sand. It is harmless by removing the harmful substances that are aggregated by adding a flocculant etc. to the mixture of raw materials and water by baking treatment that removes specific harmful substances and dioxins etc. by detoxifying them by baking That have been processed).

  In addition, in the JIS standard, the fine aggregate is defined as “aggregate that passes through the entire 10 mm mesh screen and passes through the 5 mm mesh screen by 85% or more (JIS A 0203)”. The by-product gypsum is processed into a size that conforms to JIS standards and classified.

  As the concrete admixture, one or more of blast furnace slag fine powder (coal ash generated from a pulverized coal combustion boiler), fly ash, clinker ash, and silica fume are used.

As the reinforcing fiber, glass fiber or carbon fiber having a diameter of 10 to 50 μm and a length of 5 to 50 mm is used.
Next, the manufacturing method of the concrete composition of this invention mentioned above is demonstrated.

  First, the coarse aggregate was manufactured by the following procedure. The shells used as raw materials for coarse aggregates were shells discarded at shellfish processing plants. In addition, waste plastics, rubber scraps, metal scraps, glass scraps, concrete scraps, ceramic scraps, and rubbles are made from industrial waste generated by the demolition of construction (those classified into five stable types). did.

  Since the industrial waste used as the coarse aggregate is in a state where a plurality of types of raw materials are mixed, first, a process for sorting the types of raw materials is performed. And it crushes to an appropriate magnitude | size with the crusher which is not illustrated for every kind of raw material, and is made into a crushing thing, Then, it uses with the chamfering processing apparatus 1 shown to Fig.1 (a) with respect to these crushing goods. Chamfering is performed.

The chamfering apparatus 1 includes a chamfering machine 3, a belt conveyor 5, a magnetic sorter 7, a collection container 9, and the like.
As shown in FIG. 1B, the chamfering machine 3 includes a drum support portion 3a, a rotating drum 3b, a rotating shaft 3c, and a stirring blade 3d. The rotating drum 3b is configured to be rotatable about a rotating shaft 3c by a motor of the drum support portion 3a. A stirring blade 3d is provided inside the rotating drum 3b.

  When chamfering the crushed material, the crushed material is put into the rotating drum 3 b of the chamfering machine 3 together with the plurality of abrasives 4. The abrasive 4 is a steel ball having a diameter of about 5 to 30 mm. At this time, water is also poured into the rotating drum 3b in order to uniformly grind the surface of the crushed material. The weight ratio of the crushed material: abrasive material: water charged into the rotating drum 3b is preferably about 5: 1: 6-9.

  Next, when the crushed material and the abrasive 4 are agitated by rotationally driving the rotating drum 3b, the crushed material and the abrasive or the crushed material collide with each other, and the pointed portion of the crushed material is scraped off. It becomes a rounded chamfered workpiece. Then, when the desired degree of chamfering is performed, thereafter, the rotation of the rotating drum 3b is stopped, and the chamfered workpiece and the abrasive 4 are taken out from the rotating drum 3b.

  Then, the chamfered workpiece and the abrasive 4 taken out from the rotating drum 3b are conveyed by the belt conveyor 5 as shown in FIG. On the conveying path of the belt conveyor 5, a magnetic sorter 7 that generates a strong magnetic force by an electromagnet is installed.

  When the chamfered workpiece and the abrasive 4 conveyed by the belt conveyor 5 pass through the installation location of the magnetic sorter 7, only the abrasive 4 that is a steel ball is attracted to the magnetic sorter 7. Then, only the chamfered workpiece is conveyed to the collection container 9 by the belt conveyor 5.

  Then, the chamfered workpieces collected in the collection container 9 are classified using a 2 mm mesh sieve, and those that have not passed through the 2 mm mesh sieve are used as coarse aggregate. Moreover, about what passed 2 mm net sieve, if necessary, it can also be utilized as a fine aggregate.

Note that fine aggregates and concrete admixtures are used without chamfering like coarse aggregates.
Cement, coarse aggregate, fine aggregate, concrete admixture, and reinforcing fibers described above are classified according to the specific gravity of each raw material as shown in Table 1 below, and are mixed within the range of the mixing ratio corresponding to each classification. To produce a concrete composition.

Next, the fish reef block 10 manufactured using the concrete composition described above will be described.

As shown in FIG. 2A, the fish reef block 10 of the present embodiment is shaped to resemble natural stone. This fish reef block 10 is manufactured by the following procedure.
First, a concrete composition dedicated to the fish reef block 10 is generated. In this embodiment, cement 50%, concrete scrap (coarse aggregate B) 10%, ceramic scrap (coarse aggregate C) 15%, glass scrap (coarse aggregate D) 5%, shells (coarse aggregate D) ) 5%, by-product gypsum (fine aggregate F) 8%, blast furnace slag fine powder (concrete admixture) 5%, and glass fiber (reinforced fiber) 2%.

  Then, the reef block 10 is manufactured by pouring and kneading the concrete composition and water (the amount of water specified in JIS standard) into a natural stone mold.

  The fish reef blocks 10 manufactured in this way may be simply stacked when installed in the water, but for example, a plurality of fish reef blocks 10 may be consolidated in preparation for a disaster such as a typhoon. In the case of connection, a plurality of fish reef blocks 10 may be connected using a dedicated connection fitting. Specifically, for fish reef as shown in FIGS. 2 (b), (c), and (d). The block unit 15 may be configured.

As shown in FIGS. 2B, 2C, and 2D, the fish reef block unit 15 includes four fish reef blocks 10, a connection fitting 17, and a fixing fitting 18.
The connecting metal fitting 17 is a metal fitting for connecting the four fish reef blocks 10, and the fixing metal fitting 18 is a metal fitting for fixing to the seabed or the like when installed in water. In addition, as the connection metal fitting 17 and the fixed metal fitting 18, the thing of the galvanization specification or aluminum alloy plating specification which can anticipate the durability of 50 years or more also in the marine environment was utilized.

  In the case of the fish reef block 10 as described above, the strength of the hardened concrete body is determined by the JIS standard by the glass fiber contained in the concrete composition as compared with the conventional fish reef block not containing the glass fiber. Meeting the standards.

  Therefore, even if a relatively large amount of aggregate derived from concrete scraps that causes the strength of the fish reef block 10 to be reduced is included as in the concrete composition of the present embodiment, the finally obtained fish reef block The strength of 10 is higher than that of the conventional one not containing reinforcing fibers, and not only satisfies the JIS standard, but also has a much superior strength compared to the minimum standard value defined in the JIS standard. Can be provided.

  Further, in the case of the above-described fish reef block 10, the chamfering process is performed even when the cement portion or the like is eroded by water or sea water and the coarse aggregate is exposed on the outer surface of the fish reef block 10 after being installed in the river or the sea. Only the applied coarse aggregate is exposed, and the coarse aggregate with sharp corners is not exposed. Therefore, in the case of such a reef block 10, unlike a concrete product including a coarse aggregate having a sharp angle, no measures are taken to prevent the sharp portion of the aggregate from being exposed. You can do it.

[Second Embodiment]
As shown in FIG. 3A, the fish reef block 20 exemplified in the present embodiment includes a base portion 21a and a covering layer 21b that covers the base portion 21a. The base 21a is obtained by curing the concrete composition of the first embodiment.

  The covering layer 21b is a cement to which carbon fibers are added, and has a thickness of about 5 mm. As this cement, the thing with high safety | security with respect to a biological body is utilized like 1st Embodiment. Carbon fibers having a diameter of 10 to 50 μm and a length of 5 to 50 mm are used.

The covering layer 21b is manufactured by forming a base portion 21a and then spraying a mixture of cement containing carbon fibers and an appropriate amount of water onto the surface of the base portion 21a.
As the spraying device, a general device may be used. For example, a well-known device including a concrete composition pump, a quick-setting agent pump, an air compressor, a spraying nozzle, a supply hose connecting each part, and the like can be used.

  In the fish reef block 20 as described above, the carbon fiber is exposed on the surface of the coating layer 21b. Therefore, when installed in a river or in the sea, a conventional concrete product not covered with cement containing carbon fiber. Compared to, the algae adheres to the carbon fibers exposed on the surface at an early stage and settles as it is. Therefore, algae can be propagated in a shorter period of time than conventional concrete products.

  In addition, seaweed spores, seafood eggs, and coral polyps are attached to the carbon fibers on the surface of the block and grow as they are. Therefore, it is possible to form a rich fish reef rich in seaweed, seafood, and coral as compared with conventional concrete products not covered with cement containing carbon fiber.

[Third Embodiment]
As shown in FIG. 3B, the fish reef block 30 exemplified in the present embodiment includes a base portion 31a and a covering layer 31b that covers the base portion 31a. The base 31a is obtained by curing the concrete composition of the first embodiment.

  The coating layer 31b is a cement to which fish meal is added and is formed to a thickness of about 5 mm. As this cement, the thing with high safety | security with respect to a biological body is utilized like 1st Embodiment. In addition, fish meal is used that is obtained by drying and pulverizing fish arabe, etc., which are discarded at a food processing plant for seafood.

  The covering layer 31b is manufactured by molding the base portion 31a and then spraying the surface of the base portion 21a with a kneaded mixture of cement added with fish meal and an appropriate amount of water. In addition, about a spraying apparatus, the well-known apparatus of the same structure as what was demonstrated in 2nd Embodiment can be utilized.

  If it is the block 30 for fish reefs demonstrated above, if it installs in a river or the sea, the fish meal contained in the coating layer 31b will be eluted to the river or the sea. In this way, the fish meal that has melted into the water serves as food for fish and plankton. Therefore, compared with the conventional product which does not contain fish meal, a lot of seafood gathers and it can be made a rich fish reef.

  In addition, in this embodiment, although the example which adds fish meal to a cement as an ingredient used as the feed of fish and plankton was shown, the ingredient used as the feed is not limited to fish meal, and is a seaweed nutrient. Ingredients may be added. Examples of ingredients that feed fish and plankton or nutrients for seaweed include calcium carbonate, nitrogenous fertilizer, phosphate fertilizer, siliceous fertilizer, vitamins, and mineral ingredients. Can be mentioned. Each of these components may be added alone or in combination of two or more.

[Other Embodiments]
As mentioned above, although embodiment of this invention was described, this invention is not limited to said specific one Embodiment, In addition, it can implement with a various form.

  In the first embodiment, the raw material of the coarse aggregate is any one or more of shells, waste plastics, rubber scraps, metal scraps, glass scraps, concrete scraps, ceramic scraps, and rubbles. However, the raw material used as the coarse aggregate is not limited to this. For example, metal industrial wastes such as blast furnace slag may be used as the raw material for the coarse aggregate.

Further, the fine aggregate is not limited to any one or plural kinds of coal ash, by-product gypsum, incinerated ash, cinder, dust, dust, sludge, waste soil, and waste sand.
In addition, the raw materials used as fine aggregates may be those that have been detoxified at the responsibility of the emission source of local governments or companies. It may be used without performing the conversion process.

In the first embodiment, the shape of the fish reef block has been described to resemble a natural stone, but the shape of the fish reef block is not limited to this.
For example, it may have a shape in which four legs 45 extend radially like a fish reef block 40 shown in FIGS. 4 (a), 4 (b), and 4 (c).

  Further, for example, it may be shaped like a fish reef block 50 shown in FIGS. 5 (a), 5 (b), and 5 (c). The reef block 50 includes a base 51, a reinforcing bar 53, and a shellfish reef roll 55. The base 51 is a hexahedral concrete structure made of the concrete composition according to the first embodiment, in which a cavity is formed inside and an opening leading to the cavity is formed on each surface. The shellfish reef roll 55 is a mixture of cement and shells, entangled with the reinforcing bar 53 and hardened, and is fixed in the cavity of the base 51.

When such a shellfish reef roll 55 is provided, the gap formed in the shellfish reef roll 55 is used as a spawning place for seafood.
Further, for example, a grid-like groove may be formed like a fish reef block 60 shown in FIG. As shown in FIGS. 6B and 6C, grooves 65 having a depth of 5 mm to 15 mm are formed on the surface of the fish reef block 60 at intervals of 10 cm both vertically and horizontally. Such a groove | channel 65 may be formed in the surface of the block 10, 20, 30, 40, 50 for fish reef illustrated by the said embodiment.

  Or not only such a linear groove | channel but a curved groove | channel may be formed, and many holes (dent) may be formed in the surface of the block for fish reefs. Even when such a hole is formed, the depth of each hole is preferably about 5 mm to 15 mm.

  With the reef block 60 having such grooves and holes formed, the coral can be fastened to the reef block faster than conventional products when installed in the sea with the corals fixed in the grooves and holes with an adhesive. Can do.

  In addition, algae, coral polyps, seaweed spores, and seafood eggs enter the grooves and holes and settle as they are, so that seaweeds, seafood and corals are more stable than those without grooves or holes. It can encourage breeding.

  Moreover, although the fish reef blocks 10, 20, 30, 40, 50, 60 and the fish reef block unit 15 exemplified in the above embodiments have been described as being used as fish reefs, the present invention is not limited thereto. . For example, it may be used as a spawning reef.

  Moreover, in said 1st Embodiment, when crushing a crushing thing, the steel ball was utilized as an abrasive | polishing material, However, The form of what is utilized as an abrasive | polishing material is not limited to this. For example, you may utilize the abrasive | polishing material of a form as shown to Fig.7 (a)-(h).

  In the abrasive 70a shown in FIG. 7A, narrow grooves having a constant interval are formed on the surface of a steel ball. As for the abrasive 70b shown in FIG.7 (b), the scale-like unevenness | corrugation is engraved on the surface of the steel ball. In the abrasive 70c shown in FIG. 7C, a plurality of dimples are formed on the surface of a steel ball. A polishing material 70d shown in FIG. 7 (d) is provided with a large number of substantially bell-shaped projections having a rounded tip having a length of about 1 to 3 mm radially on the surface of a steel ball. The abrasive 70e shown in FIG. 7 (e) is provided with a large number of substantially conical or substantially polygonal conical projections having a length of about 1 to 3 mm on the surface of a steel ball.

  The abrasive 70f shown in FIG. 7 (f) has a drill shape, and a spiral groove is provided on the side surface of a substantially cylindrical steel piece. The abrasive 70g shown in FIG. 7 (g) has a tap shape and is formed by cutting one end of a side surface of a cylindrical steel piece along a plane substantially perpendicular to the bottom surface of the cylinder. In the abrasive 70h shown in FIG. 7 (h), spiral grooves are provided on the side surface of the substantially cylindrical steel piece at a narrower interval than the abrasive 70g.

Even if the abrasives 70a to 70h as described above are used, the chamfering can be performed with the same or higher efficiency as when the abrasive 4 described in the first embodiment is used.
Moreover, although the above-mentioned 1st Embodiment demonstrated the block for fish reef which consists of a concrete composition, you may shape | mold various concrete structures from this concrete composition by construction on the spot.

  As a concrete method of on-site construction, there is, for example, a method in which a concrete structure is formed by driving a concrete composition into a formwork coated with a release agent and curing it. Concrete structures that can be formed by such methods include piers, house foundations, and the like. Such a concrete structure can have higher strength than conventional products.

  Moreover, in order to prevent falling rocks and landslides on the mountain surface, the concrete composition may be sprayed onto the slope of the mountain surface to provide a concrete coating. When spraying the concrete composition on the slope of the mountain surface, for example, the spraying device described in the second embodiment and the third embodiment may be used. Thus, if the concrete composition of this invention is utilized, compared with the concrete composition which does not contain a reinforced fiber, the fall prevention structure excellent in intensity | strength can be constructed on the slope of a mountain surface.

  Moreover, in order to prevent rainwater collected on the land roof from entering the house, a concrete composition may be sprayed on the surface of the land roof. In this way, if the concrete composition of the present invention is sprayed on the surface of a flat roof, cracks due to secular change are less likely to occur compared to a concrete composition that does not contain reinforcing fibers, and a waterproof structure with excellent durability is achieved. Can be configured.

  In addition, in the construction work such as plastering work in plastering work and soil concrete leveling work in civil engineering work, a mixture of cement and fine aggregate is used. In this case, it is blended in the concrete composition of the present invention. Fine aggregate may be used.

  DESCRIPTION OF SYMBOLS 1 ... Chamfering processing apparatus, 3 ... Chamfering processing machine, 4,70a, 70b, 70c, 70d, 70e, 70f, 70g, 70h ... Abrasive material, 3a ... Drum support part, 3b ... Rotating drum, 3c ... rotating shaft, 3d ... stirring blade, 5 ... belt conveyor, 7 ... magnetic sorter, 9 ... collection container, 10, 20, 30, 40, 50 , 60 ... Fish reef block, 15 ... Fish reef block unit, 17 ... Connection fitting, 18 ... Fixing fitting, 21a, 31a, 51 ... Base, 21b, 31b ... Covering layer 45 ... Legs, 53 ... Reinforcing bars, 55 ... Shellfish reef rolls, 65 ... Grooves.

Claims (8)

Cement,
Coarse aggregate made of crushed material obtained by crushing at least one selected from shells, waste plastics, rubber scraps, metal scraps, glass scraps, concrete scraps, ceramic scraps, and rubbles;
At least one fine aggregate selected from coal ash, by-product gypsum, incinerated ash, cinder, dust, dust, sludge, waste soil, and waste sand;
At least one admixture selected from blast furnace slag fine powder, fly ash, and silica fume;
A concrete composition comprising: at least one reinforcing fiber selected from glass fiber and carbon fiber. The concrete composition according to claim 1, wherein the coarse aggregate is obtained by chamfering the corners of the crushed material by stirring the crushed material together with an abrasive. A base formed by curing the concrete composition according to claim 1 or 2,
A concrete structure comprising: a first coating layer formed by curing cement to which carbon fiber is added and covering the base. A base formed by curing the concrete composition according to claim 1 or 2,
A second coating layer that hardens cement added with at least one of fish meal, calcium carbonate, nitrogenous fertilizer, phosphate fertilizer, siliceous fertilizer, vitamins, and mineral components, and covers the base. A concrete structure comprising: It consists of the concrete structure of Claim 3 or Claim 4. The block for fish reefs characterized by the above-mentioned. A concrete construction method characterized by forming a concrete structure from a concrete composition according to claim 1 or 2 by on-site construction. The concrete composition of Claim 1 or Claim 2 is sprayed on the slope of a mountain surface. The concrete construction method characterized by the above-mentioned. A concrete construction method comprising spraying the concrete composition according to claim 1 or 2 onto a surface of a flat roof.