JP2001322878A - Method for manufacturing porous concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cost effectively and environmentally manufacture porous concrete. SOLUTION: Wooden chips formed by pulverizing cut-over trees or the waste timber produced in building are incorporated into concrete and after the concrete cures, the concrete is subjected to drying or heating treatment, by which the chips in the concrete are burned out and gaps are formed in the concrete.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a porous concrete having voids on its surface and inside.

[0002]

2. Description of the Related Art In recent years, concrete has been used in large quantities as a structural material. Concrete structures using this concrete are expected not only to have strength, durability, and aesthetics, but also to be in harmony with the surrounding environment and ecosystems. Porous concretes having the following properties are attracting attention. As a method for producing the porous concrete, a gap formed between the coarse aggregate and the coarse aggregate is formed by mixing the coarse aggregate and the cement paste without using the fine aggregate, and the pores (voids) of the porous concrete are formed. And a method of heating a concrete molded body cured by adding organic fibers as described in JP-A-5-000867, and burning off the organic fibers to form holes, or JP-A-11-322464. As shown in the publication, there is a method of adding a fusible substance such as a wax, curing the concrete, heating the concrete, and burning out the fusible substance to form pores.

[0003]

However, in the case of manufacturing by mixing coarse aggregate and cement paste, if it is desired to enlarge the pores of the porous concrete, the coarse aggregate is manufactured using a coarser material. When the coarse aggregate is coarsened, the area where the coarse aggregate contacts each other is reduced, and the strength of the porous concrete itself is reduced. In addition, in the case where concrete is mixed with an organic fiber or a fusible substance, cured, and then heated, it is necessary to prepare an organic fiber or a fusible substance, which is economically problematic.

[0004] It is an object of the present invention to produce porous concrete economically and environmentally.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, an invention according to claim 1 is a method for producing a porous concrete having a void in a surface portion and an inside thereof, wherein the concrete is mixed with wood chips and cured. It is characterized by drying or heating after concrete is hardened.

According to the first aspect of the present invention, after mixing and hardening a piece of wood into concrete, the piece of wood mixed into the inside and the inside of the concrete is burned off by drying or heating. And a porous concrete having a large number of voids therein.
In addition, by changing the size of the wood pieces, the size of the void in the porous concrete can be changed, so even if the size of the void is increased, the strength of the concrete decreases significantly as in the case of forming with coarse aggregate and cement. I won't. Therefore, the size of the voids of the porous concrete can be made to an arbitrary size, and according to the size of the voids, for example, the soil is filled with fertilizer-added soil or the like,
It can be used as a block to support the ecology of microorganisms, plants and small animals, or as a permeable concrete paving board. In addition, the production cost of porous concrete can be reduced by using easily available wood chips.

According to a second aspect of the present invention, there is provided a method for producing porous concrete having voids on the surface and in the inside, wherein the concrete is mixed with wood chips, cured, and left in water after the concrete is hardened. .

According to the second aspect of the present invention, after mixing and hardening a piece of wood into concrete, the concrete is left in water, so that the piece of wood mixed into the surface and inside of the concrete rots. In addition, porous concrete having a large number of voids on the surface and inside can be manufactured, and the spoiled wood chips become nutrients, and nutrients of microorganisms, plants or small animals can be secured, and there is no need to add fertilizer to the voids. Further, by changing the size of the wood piece, the size of the void can be easily changed, and the strength of the porous concrete does not significantly decrease by increasing the size of the void.

The invention described in claim 3 is the first or second invention.
The method for producing porous concrete described above, wherein crushed waste wood is used as the wood piece.

[0010] According to the third aspect of the present invention, by using waste wood as a piece of wood to be mixed with concrete, resources can be effectively used and the environmental load can be reduced. It is also possible to reduce the production cost of porous concrete.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

<First Embodiment> A piece of wood is put into concrete made of cement, water, aggregate, etc. and kneaded.
Pour the concrete into a frame that has been shaped to form porous concrete. At this time, the wood chips to be added are obtained by crushing waste wood or waste wood generated when building a building into chips. The size of the piece of wood can be arbitrarily adjusted depending on the degree of pulverization. For example, when it is desired to form a porous concrete having a large void, a piece of wood that is coarsely pulverized so that the piece of wood becomes large is used. Also, the amount of wood chips added can be set arbitrarily.

After the concrete poured into the frame is cured and completely hardened, it is removed from the frame. Thereafter, the concrete block is dried or heated. The drying or heat treatment is performed until the surface and the inside of the concrete block are completely burned off.

The porous concrete formed as described above is filled with soil or the like to which fertilizer has been added to the surface and internal voids to secure a comfortable space necessary for the ecosystem, and then, as shown in FIG. Installed on the surface of concrete block. In addition, it is also possible to leave a void without filling the void with soil or the like and use it as a permeable concrete pavement plate.

As described above, according to the porous concrete of the above embodiment, the wood block is burned out by drying or heating the concrete block mixed with the wood block, so that the surface block and the inside have voids. Porous concrete can be formed. Therefore, since the formed void is not due to the gap generated between the coarse aggregate and the coarse aggregate, the void can be easily made into an arbitrary size by changing the size of the wood piece, and the size is increased. Thereby, the strength of the porous concrete is not significantly reduced. By filling the voids of the porous concrete with soil or the like to which fertilizer has been added, and securing a comfortable space necessary for the ecosystem, the ecosystem can be supported and the environment can be purified. In addition, by leaving the gap as it is, it can be used as a well-drainable permeable concrete pavement plate. In addition, by crushing wood from cutting wood and building waste, resources can be used effectively, reducing the environmental burden and more easily than organic fibers and fusible materials. It is available.

<Second Embodiment> Similar to the first embodiment described above, a piece of wood obtained by pulverizing cut wood or waste wood is put into concrete, kneaded, mixed, poured into a frame, and cured. And cure. Thereafter, the hardened concrete block is removed from the frame, and is immersed in water for a long period of time to rot the surface portion and the inside of the concrete block. After the decay of the wood pieces is completed, the wood pieces are lifted out of the water, and soil is added to the decayed wood pieces in the voids to secure a comfortable space required for the ecosystem. I do.

As described above, according to the porous concrete of the above-described embodiment, the concrete block hardened by mixing the wood chip is submerged in the water for a long time, so that the wood chip rots. Porous concrete can be formed. The decayed wood chips remaining in the voids of the porous concrete can be used as fertilizer, and by filling soil etc. to secure a comfortable space necessary for the ecosystem, the ecosystem can be added without adding new fertilizer. It can help and help clean up the environment. In addition, as in the first embodiment, by obtaining a piece of wood from felled timber or building waste, resources can be used effectively, and by changing the size of the piece of wood, The size of the voids formed can be changed, and by increasing the voids, the strength of the porous concrete does not significantly decrease.

In the above embodiment, the porous concrete is a rectangular parallelepiped in FIG. 1. However, the present invention is not limited to this. For example, it may be cylindrical.
In addition, the size and the number of voids of the porous concrete are arbitrary, and it goes without saying that the specific detailed structure and the like can be appropriately changed.

[0019]

According to the first aspect of the present invention, the hardened concrete mixed with the wood pieces is dried or heated to burn out the wood pieces in the concrete. Porous concrete having voids can be manufactured. By using wood chips, the production cost of porous concrete can be reduced, and the pores of the porous concrete can be arbitrarily sized. It can be used as a functional concrete pavement board.

According to the second aspect of the present invention, the porous concrete can be manufactured by leaving the concrete mixed with the wood pieces and hardening the concrete in the water to decompose the wood pieces. In addition, spoiled wood chips remain in the voids of the porous concrete, and can become nutrients for microorganisms, plants or small animals.

According to the third aspect of the present invention, resources can be effectively used by using discarded timber such as felled timber as a piece of wood to be mixed with concrete.
Environmental load can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which porous concrete as an example to which the present invention is applied is installed on a surface layer of an existing concrete block.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hideki Takahashi 1-20-10 Toranomon, Minato-ku, Tokyo Inside Nishimatsu Construction Co., Ltd. (72) Inventor Kazushi Shioda 1-20-10 Toranomon, Minato-ku, Tokyo Nishimatsu Construction Co., Ltd. (72) Inventor Seiji Matsuura 1-20-10 Toranomon, Minato-ku, Tokyo Nishimatsu Construction Co., Ltd. (72) Inventor Noriyuki Nishida 1-20-10 Toranomon, Minato-ku, Tokyo Nishimatsu F term (reference) 2B022 AB04 BA01 BA02 BB02 4G019 LA02 LB04

Claims (3)

[Claims] 1. A method for producing porous concrete having voids on the surface and inside thereof, wherein the concrete is mixed with a piece of wood and cured, and then dried or heated after hardening of the concrete. . 2. A method for producing porous concrete having voids on its surface and inside, wherein the concrete is mixed with a piece of wood, cured, and left to stand in water after hardening of the concrete. 3. The method for producing porous concrete according to claim 1, wherein the wood pieces are crushed waste wood.