JP2000290961A - Concrete block and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve impact resistance and abrasion resistance of a concrete block by arranging a resin protective part being mixed with a reinforcing material and reacting/hardening even in the presence of moisture in a part or the whole of a surface of a concrete main body. SOLUTION: Resin mortar mixed with a reinforcing material is injected by a prescribed thickness into a mold, and before hardening resin, concrete is poured into from above it. The resin for forming a protective part 3 on a surface of a concrete main body 2 of a concrete block 1 formed in this way hardens even if moisture exists at hardening time. For example, a polysulfide modified resin is suitable. The polysulfide modified resin is excellent in an adhesive property and chemical resistance, and is also excellent in flexibility and impact resistance, and exhibits strong adhesive strength to a wetting surface. Strength can be imparted to the protective part 3 by mixing various reinforcing materials such as an aggregate 4 and a rubber chip. Since a surface of the concrete block 1 is covered with the protective part 3 formed of resin mixed with the reinforcing materials, impact resistance and abrasion resistance can be largely improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a concrete block.

[0002]

2. Description of the Related Art Concrete blocks are frequently used for protecting slopes, rivers and coastal quays, cliffs, and the like, and paving passages. Among them, those used on the shore include those for wave-dissipation such as tetrapots and those for seawalls laid on the shore surface. Seawalls are usually laid side by side on the beach. As the shape,
Some include a hole at the center to reduce the wave force, and others have a ridge on the surface. These not only prevent beach erosion and protect the beach, but also protect the landscape near the beach, various facilities, and the like, and also have a significant meaning of national land conservation.

[0003] In addition, there is a type that is used like a stone wall on a slope to prevent a cliff or the like from collapsing. Of course, they are laid side by side on gentle slopes.

[0004]

These concrete blocks, especially those used on the beach, are severely damaged because they are exposed to thousands to tens of thousands of waves per day. In particular, in the case of seawall laying type, not only the impact by the waves, but also the surface is rubbed every time by sand and pebbles brought by the waves. By being rubbed with sand or the like, the surface of the concrete block wears from a soft part and loses its thickness.

This abrasion is so severe that the corners of the concrete block become rounded in one year. Of course, the surface also wears out and has irregularities. Such wear not only impairs aesthetics, but also reduces the weight of the concrete block itself, does not meet the design standards at the time of laying, and furthermore, it is not possible to secure the engagement thickness between the concrete blocks, losing stability and collapsing . In addition, the wave-dissipating effect is reduced, and the sedimentation effect is reduced, making it impossible to serve as a seawall.

[0006] Eventually, damaged concrete blocks had to be replaced immediately, and the costs were enormous. In order to prevent such a situation, there has been a long-awaited demand in the industry for a concrete block that is inexpensive and has high wear resistance.

[0007]

The inventors of the present invention have completed the concrete block of the present invention as a result of intensive studies and are characterized by a part or all of the surface of the concrete body. In addition, it is provided with a protective part made of a resin that is cured by reaction even in the presence of moisture,
The point is that a reinforcing material is mixed in the resin. Further, as a method of manufacturing a concrete block, a mixture of a resin that reacts and hardens even in the presence of water and a reinforcing material is injected into a concrete mold, and concrete is poured at least before the resin in the surface layer hardens. Things.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A concrete body is a main part of a concrete block according to the present invention. In other words, it refers to the whole except for the protection unit described later. Of course, this part is not necessarily all limited to being made of concrete, and the main body may be of cement type.

The protection section is provided on the surface of the concrete body and protects the concrete block from damage such as abrasion. Therefore, it is provided in a portion that receives external factors such as wear and impact. Usually, such a surface portion is sufficient because the laid surface is received. However, they may be provided in other parts. The expression “part or all of the surface” in the present invention refers to this.

[0010] The protection portion is a mixture of a resin and a reinforcing material (resin mortar). This resin cures even if moisture is present at the time of curing. That is, when a resin is put into a mold and concrete is poured from above before being cured, both the resin (at least the surface layer) and the concrete are uncured, but both are cured in that state.

Although any resin may be used as long as it is as described above, a polysulfide-modified resin is preferable in experiments performed by the inventors. This is because Sx (S is a sulfur atom, x is 0 to 3 on average) in the molecule of the monomer or prepolymer.
One or more repeating units of the group containing the unit are contained. Taking the polysulfide-modified epoxy resin as an example, it is a prepolymer as shown in Chemical formula 1.
This cures to a protective part.

[0012]

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[0013] Here, wherein R ¹ and R ² are of 2, of 3, Formula 4, Formula 5, Formula 6, an organic group having 7 equalization, R ^3,
R ⁴ is a residue of an epoxy prepolymer having two or more epoxy groups in a molecule. X and Y are -S
-, -O-, and -NH-. Furthermore, a
Is an integer of 0 to 5 for each repeating unit, and b is an integer of 1 to 50. Where a is 0 for all repeating units
In the case, at least one of X and Y is a -S- group.
a is preferably 1 to 2.5.

[0014]

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[0015]

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[0016]

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[0017]

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[0018]

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[0019]

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In the above Chemical Formulas 2 to 7, m is an integer of 1 or more, and R ¹ and R ² may be the same or different organic groups.

The polysulfide-modified epoxy resin is synthesized by an addition reaction between a sulfur-containing polymer or a sulfur-containing oligomer having a reactive functional group and an epoxy prepolymer having two or more epoxy groups in a molecule.
As the epoxy resin of the present invention, a compound having a diethylformal structure in which R ¹ is a compound represented by the following formula (1) is preferable.

As the polysulfide-modified resin, not only epoxy but also prepolymer such as urethane can be used. In the case of one-component urethane, a polysulfide chain can be contained in a part or the whole of the main chain of the molecule, and in the case of two-component urethane, a polysulfide chain can be contained in the prepolymer and / or the curing agent. In the case of two liquids,
A polysulfide resin (terminal SH) may be used as a curing agent.

The polysulfide-modified resin used in the present invention has better adhesiveness and chemical resistance than non-modified resin. Further, since it has a unique polysulfide skeleton, it has good flexibility and impact resistance. Since it exhibits a strong adhesive force even on wet surfaces, it is optimal for simultaneous adhesion to concrete (regardless of the time required for curing).
Although the reason for exhibiting these properties is not necessarily clear, the sulfur of the sulfide bond contained is different from the oxygen of the ether bond and is hydrophobic, but on the other hand, it has a d-orbital and therefore has a double bond. It is thought that it has a resonance structure and is easily coordinated to an inorganic substance or a metal.

The curing agent is the same as the prepolymer in which the reactive terminal group of the modified prepolymer is not modified, and thus may be the same as that which is not modified. In the case of an epoxy, a usual one such as amine or polyamine may be used. Further, other additives such as a diluent, a plasticizer, a solvent, and a pigment may be added to these resins.

The reinforcing material is mixed with the above-mentioned resin, and is of an aggregate type, a fiber type, a rubber type or the like. Reinforcing materials are those that give strength to the protection part, absorb deformation like rubber chips, and improve wear resistance, those that improve the surface and overall wear resistance like aggregates, It also improves the strength against cracking and pulling like a fiber. By mixing this reinforcing material, various strengths that cannot be obtained with a mere resin can be obtained, and this is a major feature of the present invention. Further, a plurality of kinds of reinforcing materials may be used in combination.

Aggregate materials include not only natural materials such as small stones, sand and gravel, but also ceramics and their crushed materials.
A crushed product may be used. The shape of the grains may be any shape. In the case other than a sphere, the expression diameter means an approximate outer size. These generally have high hardness and improve wear resistance. In order to make this more remarkable, it is also preferable to use hard aggregates such as emery and garnet.

Fiber-based materials such as glass fiber, polyamide fiber and polyester fiber have high strength.
Short fibers (1 mm to several cm) are preferred. These improve the impact resistance of the protection portion and greatly contribute to crack prevention.

As the rubber type, plastic particles,
It is a rubber chip or the like, and generally does not have high hardness. Conversely, many are flexible. In such a case, it deforms to absorb shocks and shears, contributes to preventing cracks, and improves wear resistance.

The mixing ratio of the reinforcing material is about several% to 50% by weight in the case of the fiber type, but can be about several% to 2000% in the case of the rubber type and the aggregate type. The resin mortar obtained by mixing the reinforcing material may have no voids after curing, or may have water permeability having voids. This also varies depending on the type of reinforcing material used, and is free. However, in any case, it is natural that the effect is small unless more than several% is mixed.

When a large amount of aggregate is mixed and a water-impermeable structure is desired, adjusting and molding the resin / aggregate mixture results in a structure with many bubbles, which is troublesome for molding. The resin liquid is poured into the mold in advance, and the aggregate can be added in a large amount as it is and can be submerged in the liquid. However, the structure is troublesome and has many bubbles. The latter method is superior to the former method, but the problem is that the charged aggregate is less compatible with the resin liquid, and air is involved and the fluidity is poor.
In order to improve this, the surface of the aggregate to be mixed is preferably mixed in advance with a solvent or a resin liquid that is easily compatible with the resin liquid. In this way, for example, in the case of a rubber chip, a resin liquid / rubber chip (weight ratio) is used in a usual method.
What was about 1 / 0.4, but easily 1 / (1 or more)
The entrapment of air bubbles is also significantly reduced.

The thickness of the protective portion of the present invention is not particularly limited.
The selection may be made according to the environment of the place of use (the strength of external factors received). Although it is about 0.1 to 15 cm, it is preferably 0.5 to 3 cm in a normal sea.

Further, the surface of the protective portion may be smooth or may have various irregularities. For example, in order to prevent slippage when walking on it, it is free to provide corrugated unevenness or provide a geometric groove.

Although the method for producing the concrete block of the present invention is not particularly limited, it is desirable to produce the concrete block by utilizing the characteristics of the resin used in the present invention.

For example, a resin mortar mixed with a reinforcing material is injected into a concrete block molding die (in the case where the surface is made uneven, the unevenness is formed on the bottom surface or a member having such a shape is laid). Then, before the resin is cured (other than the surface layer may be cured), concrete may be poured from above. The reinforcing material may be mixed with the resin, or may be added to the resin or the resin mortar. In addition, a method of impregnating the resin after installing only the reinforcing material is also possible depending on the material. It is an anchor to prevent concrete from penetrating into the resin moderately and partially after hardening. Of course, if the concrete intrudes too much downward, a net or the like may be provided in between the resin and the resin. Even in this case, there is no fear of peeling because some penetrates.

Thus, a concrete block with a protection section is completed just by leaving it alone. Of course, operations and steps performed during the production of ordinary concrete blocks may be performed.
For example, vibration, defoaming, etc.

The shape of the concrete block of the present invention may be the same as that of a commonly used concrete block. That is, it may be determined according to the application.

The concrete block of the present invention can be used in any place where the concrete block can be used, such as for seawalls, wave-breaking, retaining walls, road walls, cliffs, drainage channels, and the like. It is possible where there was not.

Hereinafter, the present invention will be described in more detail with reference to embodiments shown in the drawings.

FIG. 1 is a sectional view showing an example of the concrete block of the present invention. A protective part 3 made of resin is provided on the upper part of the concrete body 2. This protection part 3
Is a polysulfide-modified epoxy resin mortar in which an aggregate 4 is mixed. The aggregate 4 uses natural stone pebbles and pulverized materials as hard aggregates. In this example, the thickness of the protection part is 5 cm.

FIG. 2 is a sectional view showing another example of the concrete block of the present invention. In this example, the protection portion 3 is mixed with the rubber chip 5. In addition, anti-slip irregularities are formed on the surface of the protection portion 3.

FIG. 3 is a sectional view showing still another example of the concrete block of the present invention. In this example, the protection unit 3
Is mostly composed of a rubber chip 5, and a resin exists around the rubber chip 5 so as to bond the rubber chip 5 to the point. Therefore, it is a type having many voids and allowing water to permeate. Of course, a similar configuration is possible with a reinforcing material other than a rubber chip.

[0042]

The concrete block of the present invention has the following advantages. (1) Since the surface of the concrete block is covered with the protective portion, impact resistance, wear resistance, and the like are greatly improved. (2) Since the resin serving as the protective portion cures even in the presence of water, its production is very easy. (3) Since the reinforcing member is mixed in the protection portion, the protection portion is superior in impact resistance, abrasion resistance, and the like as compared with a resin-only one. (4) Since the protective portion can be made water-permeable, it can be suitably used in places where a wave-dissipating effect and the generation of algae and grass are required.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a concrete block according to the present invention.

FIG. 2 is a sectional view showing another example of the concrete block of the present invention.

FIG. 3 is a sectional view showing still another example of the concrete block of the present invention.

[Explanation of symbols]

 1: concrete block 2: concrete body 3: protective part 4: aggregate 5: rubber chip

 ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hideharu Nagata 9-2-30 Tanimachi, Chuo-ku, Osaka-shi, Osaka F-term in Osada Giken Co., Ltd. 2D018 EA01 4F100 AC06H AE01A AG00H AK01B AK41H AK46H AK51B AK53B AK57B AL06B AN00H BA02 CA23B DG01H DG03H EH312 EJ082 GB01 GB07 JB12B JK09 JK10 JL01 4J002 CD201 CK051 CN011 CN021 FD010 GF00 GL00

Claims (4)

[Claims] 1. A concrete protecting body made of a resin which reacts and hardens even in the presence of moisture on a part or all of a surface of a concrete body, wherein a reinforcing material is mixed with the resin. A concrete block characterized by the following. 2. The concrete block according to claim 1, wherein the resin is a polysulfide-modified resin. 3. The concrete block according to claim 2, wherein the polysulfide-modified resin is an epoxy-based or urethane-based resin. 4. A concrete block, characterized in that a mixture of a resin which reacts and hardens even in the presence of water and a reinforcing material is poured into a concrete mold and concrete is poured at least before the resin of the surface layer hardens. Production method.