JPH0568446A - Multilayered sheet and production of concrete structure using the same - Google Patents

Abstract

PURPOSE:To obtain a multilayered sheet having high operating efficiency by sprinkling lumps of an acidic metallic salt on one surface of a double-sided tacky sheet, then covering the resultant surface with a water-soluble or an alkali-soluble film and subsequently applying mold release paper to the other surface of the sheet. CONSTITUTION:The objective sheet is obtained by sprinkling lumps 1 of an acidic metallic salt such as ferrous sulfate on one surface of a double-sided tacky sheet 3, then covering the resultant surface with a water-soluble or an alkali-soluble film 2 and further applying mold release paper 4 to the other surface of the above-mentioned tacky sheet 3. Furthermore, the mold release paper 4 of the sheet is peeled to form and harden a concrete structure. Thereby, the concrete structure suitable as proliferating reefs in seaweed beds is obtained.

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 concrete structure suitable for seaweed reefs, and a multi-layer sheet used for the method.

[0002]

2. Description of the Related Art Nowadays, as 200 nautical miles has become a maritime territory, the promotion of coastal fisheries is an urgent task. For the promotion of coastal fisheries, it is essential to create a habitat suitable for seafood, but for that purpose, it is necessary to increase the seaweed beds, which are the feeding grounds for seafood.

However, in recent years, concrete structures are often sunk in the sea due to land reclamation, reclamation of coastal areas, construction of breakwaters and jetties, and construction of breakwater blocks. The good seaweed beds along the coast are getting rough, and the seaweed beds are disappearing or decreasing, which is a serious problem.

There are various possible reasons why the seaweed bed is roughened by immersing the concrete structure in the sea as described above. However, the strong alkaline (pH = about 13) component eluted from the surface of the concrete structure into the sea is the main factor. is there. That is, when a strong alkaline component is eluted into seawater, it causes obstacles to the growth and growth of diatoms, green algae, brown algae, red algae, or microorganisms, and these algae or microorganisms die. When algae die, a layer of limestone, which is a so-called layered lime layer, covers the surface of the concrete structure, and this deposits on the surface, resulting in the prevention of algae attachment and habitation.

On the other hand, it is known that iron oxide and manganese salts are necessary for the growth of algae and certain types of seafood. Therefore, while neutralizing the alkaline components that elute from the concrete structure in the sea, it is essential for the algae and seafood to live in,
Means for making the concrete structure itself a good seaweed bed by devising iron oxide or manganese salt on the surface of the structure has been devised.

For example, the inventors of the present invention filed a prior application (Japanese Patent Publication No.
9-3165), on the surface of a concrete base, a lump of ferrous sulfate or ferric sulfate is embedded in the uncured concrete, and the concrete is cured and the lump of crystal is We proposed a seaweed bed reef with a large number of recesses at the same time by making a layer of iron sulfate on the concrete surface by dissolving it in water. In this breeding reef, the strong alkaline component eluted from the concrete surface is neutralized by the acid from ferrous sulfate or ferric sulfate, and at the same time, the iron sulfate layer is rich in iron oxide necessary for the growth of algae. Therefore, it exerts an excellent effect on the growth of algae.

Further, based on the above-mentioned technique, the present inventors have previously applied only to the surface of the concrete structure,
A solvent for propagating seaweed beds that neutralizes strong alkaline components in concrete and forms an iron oxide permeation layer on the surface of the concrete structure has been developed and filed (Japanese Patent Publication No. 63-4152).
No. 7, Japanese Patent Publication No. 1-58931). The characteristic of this seaweed bed growth solvent is that iron oxide of ferrous sulfate or ferric sulfate is limited to a fine powder of a size that penetrates from the surface of the concrete structure together with a penetrant into the fine powder of iron oxide. This is the point in which water and a concrete penetrating agent composed of a surfactant are mixed.

[0008]

The above-mentioned seaweed bed breeding reef has a large surface area and is highly effective, but
There is a problem that embedding of the iron oxide crystal mass is complicated.

Further, the solvent for growing seaweed beds is used by coating it with a brush or a spray on the surface of a structure such as a concrete wave-dissipating block that is deposited on the coast or in the sea.
Since it is applied to a huge number of concrete structures, work efficiency is poor. (2) The solvent coating layer peels from the concrete structure after a long period of time. (3) The solvent coating surface is smooth. However, there was a problem that seaweeds that grew due to roots did not take root.

[0010]

In view of the above problems, the present inventors have made a concrete structure by using a multilayer sheet carrying an acidic metal salt with a water-soluble or alkali-soluble film and an adhesive sheet. The above problems have been solved.

That is, the first aspect of the present invention is to spread an acidic metal salt lump on one surface of a double-sided pressure-sensitive adhesive sheet and carry the acidic metal salt lump by covering with a water-soluble or alkali-soluble film, and the other surface of the pressure-sensitive adhesive sheet. Is a multi-layer sheet characterized by having a release paper attached, the second of the present invention, the release paper of the first multi-layer sheet is peeled off and affixed to the inner surface of the concrete structure manufacturing formwork, A concrete structure manufacturing method is characterized in that a concrete structure is molded and cured. Hereinafter, the present invention will be described in detail.

The acidic metal salt used in the present invention is capable of neutralizing the alkaline components eluted from the surface of the concrete structure into the sea, and at the same time, inorganic acids such as Mn and Fe that promote the generation and growth of algae, and And / or a salt of an organic acid. Of these, ferrous sulfate or ferric sulfate is particularly preferable from the viewpoint of algae growth.

These acidic metal salts are used in a mass having a certain size. The size and shape of the lumps are not particularly limited, but they are preferably granular particles having a size of about 10 to 50 mm.

As the water-soluble film used in the present invention,
It has the property of being dissolved by moisture in uncured concrete, and is a water-soluble polymer compound such as polyvinyl alcohol, polyethylene oxide, sodium polyacrylate,
Starch, amylose, sodium alginate, pullulan,
Examples include polysaccharides such as xanthan gum and cellulose derivatives such as methyl cellulose and hydroxyethyl cellulose.

The alkali-soluble film used in the present invention has a property of being dissolved by an alkali component in uncured concrete, and examples thereof include copolymers of vinyl ester and ethylenically unsaturated carboxylic acid. Examples of vinyl ester include vinyl formate, vinyl acetate, vinyl propionate, vinyl butyrate and the like. Examples of the ethylenically unsaturated carboxylic acid include monocarboxylic acids such as crotonic acid, acrylic acid and methacrylic acid, and polyvalent carboxylic acids such as maleic acid and itaconic acid. These can be used alone or in combination of two or more. Among them, vinyl acetate is preferable as the vinyl ester and crotonic acid is preferable as the ethylenically unsaturated carboxylic acid.

The pressure-sensitive adhesive sheet used in the present invention is a film or sheet insoluble in water and alkali such as polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), etc., which has been subjected to double-sided pressure-sensitive adhesive processing. ..

An acidic metal salt lump formed in a suitable size such as granular is spread on one surface of a double-sided pressure-sensitive adhesive sheet with a suitable dispersion, and then the film is covered and carried, and the other surface of the pressure-sensitive adhesive sheet is separated. A multi-layer sheet of the present invention is obtained by attaching a paper pattern. In the present invention, in order to improve the solubility of the film and the solubility / permeability of the acidic metal salt, the film may be perforated or a mesh sheet made of the same material or the like may be used. ..

In the present invention, the release paper of the multi-layer sheet is peeled off and attached to the inner surface of the mold for producing a concrete structure. After assembling this mold with the water-soluble or alkali-soluble film surface covering the inner surface of the mold, ready-mixed concrete is poured into the mold to cure.

The cross section of the multilayer sheet of the present invention is specifically shown in FIG.
Shown in. In FIG. 1, 1 is a mass of acidic metal salt, 2 is a water-soluble or alkali-soluble film, 3 is a double-sided adhesive sheet,
Reference numeral 4 is a release paper, which is peeled off and used at the time of use.

Further, FIG. 2 shows a state in which the multilayer sheet of the present invention is stuck in a mold for producing a concrete structure. In FIG. 2, 5 is a form and 6 is a multi-layer sheet.

[0021]

In the present invention, the water-soluble or alkali-soluble film of the multilayer sheet attached to the inner surface of the mold is dissolved by the water or alkali component contained in the fresh concrete and spouting on the surface as the hardening progresses, The acidic metal salt mass appears to be embedded in the surface of the concrete structure.
Further, the acidic metal salt lumps are dissolved by the moisture from the concrete to form a metal salt permeation layer on the structure surface, and at the same time form a recess on the structure surface. This state is shown in FIG. A recess is formed on the entire surface of the concrete structure obtained by applying the multilayer sheet to the entire formwork. A cross section of this recess is shown in FIG. The surface of the recess is the permeation layer 7 of the acidic metal salt. Therefore, the concrete structure formed according to the present invention is an ideal seaweed bed-growing reef having on its surface a recess formed by an infiltration layer of an acidic metal salt.

[0022]

EXAMPLES Examples of the present invention will be shown below, but the present invention is not limited thereto.

Example 1 A 6% aqueous solution of polyvinyl alcohol having a degree of polymerization of 1,200 and a degree of saponification of 88 mol% (10% glycerin / including a polymer) was cast on a glass plate of 360 mm × 360 mm and kept at 20 ° C. (65% RH). ) For 48 hours and then treated at 80 ° C. for 30 seconds to obtain a water-soluble film having a thickness of 50 μm.

12 mmφ × 1 on one side of the double-sided adhesive sheet
Particulate ferrous sulfate was molded into 0mm (FeSO ₄ · 7H
₂ O) was placed side by side vertically and horizontally at 30 mm intervals, and the obtained water-soluble film was covered to prepare a multilayer sheet.

This multi-layer sheet is 150 mmφ × 40 mm
It was affixed to the side surface of the concrete test piece formwork, and a raw mortar of cement: sand: water = 1: 3: 0.6 was poured therein. This was left at room temperature for 24 hours and then demolded to obtain a concrete structure.

As a result of observing the state of the side surface of this concrete structure, the film was completely dissolved, ferrous sulfate was also dissolved, and a recess was formed in the grain shape on the side surface of the concrete, and sulfuric acid was formed around it. A ferrous permeation layer was formed.

Example 2 6% of a vinyl acetate / crotonic acid copolymer having a polymerization degree of 950 (vinyl acetate: crotonic acid mol ratio 92.3: 7.7)
Aqueous solution (including glycerin 10% / polymer) 360
2 mm by casting on a glass plate of mm x 360 mm
After drying at 0 ℃ (65% RH) for 48 hours, 80 ℃
For 30 seconds to obtain an alkali-soluble film having a thickness of 50 μm.

12 mmφ × 1 on one side of the double-sided adhesive sheet
Particulate ferrous sulfate was molded into 0mm (FeSO ₄ · 7H
₂ O) was placed side by side vertically and horizontally at 30 mm intervals, and the obtained alkali-soluble film was covered to prepare a multilayer sheet.

This multi-layer sheet is 150 mmφ × 40 mm
It was affixed to the side surface of the concrete test piece formwork, and a raw mortar of cement: sand: water = 1: 3: 0.6 was poured therein. This was left at room temperature for 24 hours and then demolded to obtain a concrete structure.

When the state of the side surface of this concrete structure was observed, as in Example 1, both the film and ferrous sulfate were completely dissolved, and recesses and permeation layers were well formed.

Example 3 The multi-layered sheet prepared in Example 1 was used to measure an upper bottom of 200 mm square,
It was affixed to the inner surface of a trapezoidal concrete block mold having a bottom of 1000 mm square and a height of 500 mm, and fresh concrete was poured into the frame, and after 24 hours, it was demolded to obtain a concrete block experimental reef. On the surface of the obtained experimental reef, depressions were formed in the shape of ferrous sulfate grains on one surface, and a permeation layer of ferrous sulfate was formed around the depressions.

This was sunk from a coastal breakwater (disintegration block) 10 m offshore and at a water depth of 6 m (the bottom material is pumice with a diameter of 5 m or less and gravel or gravel with a diameter of 0.3 m or less).

When observed 6 months later, juveniles such as Ishimozuku, Hondawara, Akamoku, Konamiuchi, and the like had settled on almost the entire surface of the experimental reef, and 13 cm of leaf bodies had grown in Akamoku and Hondawara.

Comparative Example As a comparison, a trapezoidal concrete block comparative reef with an upper bottom of 200 mm square, a lower bottom of 1000 mm square, and a height of 500 mm was prepared in the same manner as in Example 3 except that the multilayer sheet was not used. It was sunk in the same place as. When the observation was performed after 6 months in the same manner as in Example 3, the epiphyte cover of algae on the comparative reef was about 1/5, and the maximum leaf length was about 5 cm.

[0035]

When the concrete structure obtained by the production method using the multilayer sheet of the present invention is submerged in the sea, the alkaline component eluted from the concrete structure is moderated by the acidic metal salt penetrating the surface of the structure. Since the surface is rich in metal oxides that are favored by algae and seafood, it is possible to create an environment suitable for the growth of feeding organisms such as algae, and further, it is formed on the entire surface of the concrete structure. The recess acts very effectively as a place for algae to grow.

Since the multilayer sheet of the present invention is a pressure-sensitive adhesive sheet, it can be easily attached to a mold and may be appropriately cut and used according to the shape, size, etc. of the mold. Therefore, the work efficiency is high.

Further, since the water-soluble or alkali-soluble film and the acidic metal salt are all dissolved after the concrete structure is manufactured, only the adhesive sheet remains on the demolded formwork, and only the adhesive sheet is peeled off. Since it can be used for the next manufacturing, it is possible to save labor in the maintenance of the form itself.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a multilayer sheet of the present invention.

FIG. 2 is a diagram showing a state in which the multilayer sheet of the present invention is attached to the inner surface of the concrete block formwork.

FIG. 3 is a diagram showing a concrete block obtained by the manufacturing method of the present invention.

FIG. 4 is an enlarged view of a recess of the concrete block shown in FIG.

[Explanation of symbols]

 1 Acid Metal Salt Lump 2 Water Soluble or Alkali Soluble Film 3 Double-sided Adhesive Sheet 4 Release Paper 5 Form Frame 6 Multilayer Sheet 7 Acid Metal Salt Penetration Layer

Front Page Continuation (72) Inventor Kunio Iwamoto 4-6-15 Matsumoto, Fukui-shi, Fukui Prefecture Terratsux Co., Ltd. (72) Inventor Eiman Matsuoka 2209 Aomi, Aomi-cho, Nishikubiki-gun, Niigata Denki Kagaku Kogyo Co., Ltd. Inside the Aomi Factory (72) Inventor Fumio Matsuda 2209 Aomi, Aomi-machi, Nishikubiki-gun, Niigata Electric Chemical Industry Co., Ltd. Inside the Aomi Factory (72) Inventor Tomohiro Kaneko 1-4-1 Yurakucho, Chiyoda-ku, Tokyo Denki Kagaku Kogyo Co., Ltd. (72) Inventor Hiro Tokuda 3-401 Isogo, Isogo-ku, Yokohama-shi, Kanagawa Prefecture (401) Masao Ohno 194 Ijiri, Usa-cho, Tosa-shi, Kochi Kochi University Marine Biological Education and Research Center

Claims (2)

[Claims] 1. A double-sided PSA sheet is sprayed with an acidic metal salt lump on one side and covered with a water-soluble or alkali-soluble film to carry the acidic metal salt lump, and a release paper is attached to the other surface of the adhesive sheet. The multi-layered sheet characterized in that 2. A method for producing a concrete structure, characterized in that the release paper of the multi-layer sheet according to claim 1 is peeled off and affixed to an inner surface of a mold for producing a concrete structure to mold and cure the concrete structure. Method.