JP7220086B2 - Formwork for concrete molding, method for manufacturing same, and method for manufacturing colored concrete - Google Patents

Description

TECHNICAL FIELD The present invention relates to a formwork for concrete molding, a method for manufacturing the same, and a method for manufacturing colored concrete.

Conventionally, the present applicant has already proposed the form described in Patent Document 1 as a form for concrete molding. The formwork of Patent Document 1 includes a mold surface capable of imparting a wood-like appearance to a concrete surface, and a porous layer provided on at least a part of the mold surface and formed of hydrophobic oxide fine particles. is. According to this, the porous layer suppresses the exudation of components (for example, components such as lignin) from the mold, and the super water-repellent effect of the porous layer formed from the hydrophobic oxide fine particles prevents the molding. The occurrence of depressions such as air pockmarks on the concrete surface afterward is greatly reduced, and the design of the concrete surface can be improved.

JP 2016-159591 A

By the way, if concrete is cast using a formwork made by laminating wood such as cedar boards, it is possible to give the concrete surface a color derived from wood grain and natural ingredients. When the formwork has wood grain steps unique to wood, it is difficult for air bubbles to escape from the wood grain steps, so depressions such as air pits are likely to form on the concrete surface as shown in FIG. When a super water repellent agent is applied to the surface of the formwork for the purpose of reducing surface air bubbles in order to eliminate hollows such as air pocks, it becomes difficult for water in the concrete to reach the wood, resulting in a color derived from natural ingredients eluted from the wood. However, there is a problem that it becomes difficult to attach to the concrete surface. For this reason, it has been desired to reduce dents such as air pocks that occur on the concrete surface, and to make it easier for the color derived from natural components eluted from wood to adhere to the concrete surface.

The present invention has been made in view of the above, and is a concrete molding mold capable of reducing dents such as air pocks on the concrete surface and imparting a color derived from natural ingredients eluted from wood to the concrete surface. It is an object of the present invention to provide a frame and its manufacturing method as well as a manufacturing method of colored concrete.

In order to solve the above problems and achieve the object, the concrete molding form according to the present invention comprises a substrate made of a wood material, an uneven layer provided on the substrate, and the uneven layer. and a water-repellent layer provided thereon. The composition is characterized by being able to reach the outer concrete.

Further, another formwork for concrete molding according to the present invention is characterized in that the elongation rate of the resin is 100% or less in the above invention.

Another concrete molding form according to the present invention is characterized in that, in the above invention, the water-repellent layer is a porous layer formed of hydrophobic oxide fine particles.

Further, a method for manufacturing a concrete molding form according to the present invention is a method for manufacturing the concrete molding form described above, and is characterized by providing an uneven layer and a water-repellent layer on a base material. .

In addition, a method for producing colored concrete according to the present invention is a method for producing colored concrete using the concrete molding form described above, wherein fresh concrete is poured into the concrete molding form, and after the concrete has hardened, It is characterized by demolding with.

According to the formwork for concrete molding according to the present invention, concrete comprising a substrate made of a wood material, an uneven layer provided on the substrate, and a water-repellent layer provided on the uneven layer A formwork for molding, wherein the concave-convex layer contains a resin and a filler, and the resin and the filler are a composition that allows components eluted from the base material to reach the concrete outside the water-repellent layer. Therefore, it is possible to reduce pits such as air pits on the concrete surface and to give the concrete surface a color derived from natural ingredients eluted from the wooden base material.

In addition, according to another concrete molding form according to the present invention, since the elongation rate of the resin is 100% or less, fine cracks are likely to occur at the interface between the resin and the filler. Components from the base material can reach the concrete through the cracks, so there is an effect that the color derived from the natural components eluted from the wooden base material can be applied more deeply to the concrete surface.

In addition, according to another concrete molding form according to the present invention, since the water-repellent layer is a porous layer formed from hydrophobic oxide fine particles, it is possible to effectively eliminate depressions such as air pocks that occur on the concrete surface. It is effective in that it can be effectively reduced.

Further, according to the method for manufacturing a concrete molding form according to the present invention, the method for manufacturing the above-mentioned concrete molding form, in which the concave-convex layer and the water-repellent layer are provided on the base material, It is possible to obtain a concrete molding form that can reduce depressions such as air pocks on the surface and that can color the concrete surface with a color derived from a natural component eluted from a wooden base material.

Further, according to the method for producing colored concrete according to the present invention, there is provided a method for producing colored concrete using the concrete molding form described above, wherein fresh concrete is poured into the concrete molding form, and the concrete hardens. Since the mold is removed after the molding, the effect is obtained that dents such as air pockmarks are reduced, and colored concrete that is colored in a woody tone can be obtained.

FIG. 1 is a cross-sectional view of a formwork showing an embodiment of a formwork for molding concrete, a method of manufacturing the same, and a method of manufacturing colored concrete according to the present invention. FIG. 2 is a diagram showing the properties (average values) of the filler and resin used (Source: Polymer Dictionary, Kagaku Binran, etc.). FIG. 3 is a photograph showing the surface of concrete when an uneven layer, which is a mixture of filler and various resins, is applied to a cedar board. FIG. 4 is a diagram showing color evaluation of a concrete surface in the CIE1976 color space. FIG. 5 is a diagram showing an example of the relationship between compaction energy and surface porosity. FIG. 6 is a photograph showing an example of a concrete surface using a cedar board as a formwork.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a formwork for concrete molding, a method for manufacturing the same, and a method for manufacturing colored concrete according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment.

<Concrete Formwork>
FIG. 1 is a schematic cross-sectional view of one preferred embodiment of the present invention. As shown in this figure, the concrete molding form 10 according to the present embodiment includes a base material 12 forming a form body, an uneven layer 14 provided on the base material 12, and an uneven layer 14 on the uneven layer 14. and a water-repellent layer 16 provided on. The water-repellent layer 16 is positioned on the outermost side of the formwork 10 and comes into contact with the concrete C to be molded.

[Base material]
The base material 12 constitutes the form body. The base material 12 is made of a woody material such as a cedar board. The base material 12 contains a natural ingredient for coloring, and this natural ingredient can be eluted out of the base material 12 under the action of moisture. The shape, size, etc. of the base material 12 can be appropriately designed according to the intended concrete compact, and joint bars can be interposed when it is desired to form grooves in the compact. If a jointer bar is interposed, the jointer bar forms part of the substrate 12 . Accordingly, the substrate 12 in this case also includes a jointer bar. In addition, when a joint bar is interposed, the uneven layer 14 and the water-repellent layer 16 may be provided on the surface of the joint bar.

[Uneven layer]
The uneven layer 14 is provided on the substrate 12 . Concavo-convex layer 14 is made of a mixture of resin 18 and filler 20 . When the uneven layer 14 completely coats the substrate 12 , components from the wooden substrate 12 cannot elute out of the uneven layer 14 . Therefore, the resin 18 and the filler 20 are composed of a composition that allows the components eluted from the wooden base material 12 to reach the concrete C. As shown in FIG. The elongation rate of the resin 18 is preferably 100% or less, more preferably 50% or less. By using a resin having such an elongation rate, it is possible to easily generate fine cracks at the interface between the resin 18 and the filler 20 . Components eluted from the wooden substrate 12 can easily reach the concrete C outside the water-repellent layer 16 through fine cracks, so that the color of the components eluted from the wooden substrate 12 can be applied to the concrete surface. It is possible to make it darker.

The uneven layer 14 can be composed of, for example, a filled particle-containing layer in which fillers 20 (filled particles) are dispersed in a resin 18 (matrix). By interposing the uneven layer 14, the releasability of the concrete molding form 10 can be maintained for a longer period of time. Filler particles containing at least one of an organic component and an inorganic component can be employed as the filler 20 . When the uneven layer 14 is provided on the surface of the base material 12, the amount applied may be, for example, about 0.1 to 100 g/m ² , preferably about 1.0 to 20.0 g/m ² based on the solid content. By setting it within the above range, more excellent adhesion of the hydrophobic oxide fine particles of the water-repellent layer 16 can be obtained over a long period of time, and the drop-off of the hydrophobic oxide fine particles coated on the uneven layer 14 can be suppressed. , durability and the like. The method of applying the uneven layer 14 is not particularly limited, but for example, in addition to coating methods such as spray, brush, roller, and immersion, printing methods, dripping methods, and the like can be employed. At the time of application (coating), the following matrix may be diluted with a suitable solvent, and after application, it may be appropriately dried at room temperature to about 150°C.

Examples of inorganic components include 1) metals such as aluminum, copper, iron, titanium, silver, and calcium, or alloys or intermetallic compounds containing these, and 2) silicon oxide, aluminum oxide, zirconium oxide, titanium oxide, iron oxide, and the like. 3) inorganic or organic acid salts such as calcium phosphate and calcium stearate; 4) glass; 5) ceramics such as aluminum nitride, boron nitride, silicon carbide and silicon nitride.

Examples of organic components include acrylic resins, urethane resins, melamine resins, amino resins, epoxy resins, polyethylene resins, polystyrene resins, polypropylene resins, polyester resins, cellulose resins, vinyl chloride resins, polyvinyl Organic polymer components (or resin components) such as alcohols, ethylene-vinyl acetate copolymers, ethylene-vinyl alcohol copolymers, ethylene-ethyl acrylate copolymers, polyacrylonitrile, and polyamides can be preferably used.

As the above-mentioned filler particles, particles containing both an inorganic component and an organic component can be used, in addition to particles comprising an inorganic component or particles comprising an organic component. Among these, in particular, at least one of acrylic resin particles, polyethylene resin particles, hydrophilic silica particles, calcium phosphate particles, charcoal powder, calcined calcium particles, uncalcined calcium particles, calcium stearate particles, aluminum oxide particles, etc. can be used. more preferred.

The average particle size of the filler particles (measured by a laser diffraction particle size distribution meter) is preferably about 0.3 to 100 μm, more preferably 1 to 80 μm, and more preferably 5 to 60 μm, considering the thickness of the coating film used for the mold. More preferably, 20 to 50 μm is most preferable. If the thickness is less than 0.3 μm, it is not suitable in terms of handleability, formation of irregularities, and the like. On the other hand, if it exceeds 100 μm, it is not suitable in terms of omission of the filling particles, dispersibility, and the like. The shape of the filler particles is not limited, and may be, for example, spherical, spheroidal, irregular, teardrop, flat, hollow, porous, or the like.

Thermoplastic resins, thermosetting resins, rubbers, elastomers, waxes, and the like can be used as the resin 18 (matrix) that forms the uneven layer 14 and binds the fillers 20 (filling particles). The content of the filler particles in the matrix can be appropriately changed according to the material of the matrix, the type of filler particles, desired physical properties, etc., but is generally preferably 1 to 80% by weight, preferably 3 to 80% by weight based on the solid content. 50% by weight is more preferred.

The method of incorporating the filler particles (the method of dispersing the filler particles in the matrix) is not particularly limited. A blending method and the like can be mentioned. The mixing method may be either dry mixing or wet mixing.

When the matrix is a thermoplastic resin, the main components of the thermoplastic resin layer are generally 1) a thermoplastic resin or its constituent monomers or oligomers, 2) a solvent, and 3) a cross-linking agent if necessary. Filling particles may be added and mixed in a mixture thereof. A known thermoplastic resin can be employed as the thermoplastic resin. For example, in addition to acrylic resin, polystyrene, ABS resin, vinyl chloride resin, polyethylene resin, polypropylene resin, polyamide resin, polycarbonate, polyacetal, fluorine resin, silicon resin, polyester resin, etc., blended resins thereof, these A copolymer, a modified resin, or the like containing a combination of monomers that

When the matrix is a thermosetting resin, for example, phenol resin, urea resin, melamine resin, unsaturated polyester resin, epoxy resin, silicon resin and the like can be used. When the matrix is an elastomer, for example, a PVC-NBR blend elastomer, a urethane elastomer or the like can be used.

[Water-repellent layer]
The water-repellent layer 16 is provided on the surface of the uneven layer 14 . The water-repellent layer 16 is in contact with the concrete C to be shaped. The water-repellent layer 16 is a layer having a water-repellent surface with a water contact angle α of 130° or more, more preferably a super-water-repellent surface with a water contact angle α of 150° or more.

Here, the term "water repellency" refers to a property indicating resistance to wetting with water, and the contact angle of water droplets placed on the surface of the water repellent layer 16 is an index of water repellency. In general, a contact angle of 90° or more is water repellent, a contact angle of 110° to 150° is highly water repellent, and a contact angle of 150° or more is super water repellent. Even if the surface free energy of the material is lowered, the contact angle is said to be limited to 120°, and in order to achieve a contact angle of more than 120°, it is necessary to process the surface into a special shape as described later.

According to the above configuration, the surface tension of the formwork surface is significantly increased by the water-repellent layer 16, so that when air bubbles in the concrete entrained at the time of placing come into contact with the surface of the water-repellent layer 16, It becomes easier to spread along the surface, and the air bubbles on the concrete surface become thinner and flatter than before. Moreover, these air bubbles are easily lifted by a small vibration applied from the outside of the base material 12 and easily escaped from the concrete surface. Therefore, according to the present embodiment, it is possible to more reliably reduce air bubbles that cause air pockmarks on the concrete surface.

The water-repellent layer 16 can be composed of a porous layer made of hydrophobic oxide fine particles, a fluorine-based resin, or the like. When the water-repellent layer 16 is composed of a porous layer made of hydrophobic oxide fine particles, the hydrophobic oxide fine particles as a raw material are not particularly limited as long as they are hydrophobic, and are made hydrophobic by surface treatment. It can be anything. For example, it is also possible to use fine particles having a hydrophobic surface state by subjecting hydrophilic oxide fine particles to a surface treatment with a silane coupling agent or the like. The type of oxide is not particularly limited as long as it is hydrophobic. For example, at least one of silica (silicon dioxide), alumina, titania and the like can be used. These can employ well-known or commercially available products.

For example, as silica, the product names "AEROSIL R972", "AEROSIL R972V", "AEROSIL R972CF", "AEROSIL R974", "AEROSIL RX200", "AEROSIL RX300", "AEROSIL NX90G", and "AEROSIL RY200" (above, Japan Aerosil Co., Ltd.), "AEROSIL R202", "AEROSIL R805", "AEROSIL R812", "AEROSIL R812S" (manufactured by Evonik Degussa), "Silohobic-100", "Silohobic-200" , “Silophobic-603” (manufactured by Fuji Silysia Chemical Co., Ltd.) and the like. AEROSIL and Cyrophobic are registered trademarks.

Examples of titania include the product name "AEROXIDE TiO2 T805" (manufactured by Evonik Degussa). Examples of alumina include fine particles obtained by treating the product name "AEROXIDE Alu C" (manufactured by Evonik Degussa) with a silane coupling agent to make the particle surface hydrophobic. AEROXIDE is a registered trademark.

Among these, hydrophobic silica fine particles can be preferably used. In particular, hydrophobic silica fine particles having a trimethylsilyl group on the surface are preferable in that more excellent water repellency can be obtained. Commercial products corresponding to this include, for example, the above "AEROSIL RX200", "AEROSIL RX300", "AEROSIL NX90G" (manufactured by Nippon Aerosil Co., Ltd.), "AEROSIL R812", "AEROSIL R812S", and "AEROSIL R8200" ( (manufactured by Evonik Degussa) and the like.

The particle size of the hydrophobic oxide fine particles is not limited, but the average primary particle size is preferably 3 nm to 10 μm, more preferably 3 to 100 nm, and most preferably 5 to 50 nm. By setting the average primary particle size within the above range, gas such as air can be retained in the voids in the aggregate, resulting in a porous structure and excellent releasability. This aggregated state is maintained even after adhering to the surface of the uneven layer 14, so excellent releasability can be exhibited. In particular, by using hydrophobic oxide fine particles having an average primary particle diameter of 3 to 100 nm, it is possible to obtain a concrete molding form 10 having a surface with a three-dimensional network porous structure.

The water-repellent layer 16 of hydrophobic oxide fine particles formed on the surface of the uneven layer 14 is preferably porous having a three-dimensional network structure, and its thickness is preferably about 0.1 to 500 μm. 0.5 to 20 μm is more preferable. By forming the layer in such a porous state, a large amount of air can be contained in the layer, and more excellent releasability can be exhibited.

In the present invention, the measurement of the primary particle average diameter can be performed with a scanning electron microscope (FE-SEM). A microscope may be used in combination. Specifically, when the particle shape is spherical, the diameter is regarded as the diameter, and when the particle shape is non-spherical, the average value of the longest diameter and the shortest diameter is regarded as the diameter. Let the average diameter of the particles be the primary particle average diameter.

Although the specific surface area (BET method) of the hydrophobic oxide fine particles is not particularly limited, it is generally preferably 50 to 300 m ² /g, more preferably 100 to 300 m ² /g.

When applying to the surface of the uneven layer 14, the hydrophobic oxide fine particles may be applied as they are (dry method), or a dispersion liquid in which the hydrophobic oxide fine particles are dispersed in a solvent may be applied. may be applied (wet method). In the present invention, the latter wet method is preferable from the standpoint that an industrially uniform coating film (hydrophobic oxide fine particle layer) can be easily obtained and a three-dimensional network structure can be easily obtained.

When the above dispersion is used, the solvent used for the dispersion is, for example, alcohol (ethanol), cyclohexane, toluene, acetone, IPA, propylene glycol, hexylene glycol, butyl diglycol, pentamethylene glycol, normal pentane, normal hexane, An organic solvent such as hexyl alcohol can be appropriately selected. At this time, a small amount of dispersant, colorant, anti-settling agent, viscosity modifier, etc. may be used in combination. The amount of the hydrophobic oxide fine particles dispersed in the solvent is usually about 10 to 300 g/L (liter), preferably about 30 to 100 g/L.

In addition, the method of applying the dispersion is not limited, and for example, in addition to coating methods such as spray, brush, roller, and immersion, printing methods (inkjet printing, screen printing, gravure printing), dropping methods, and the like can be employed. can. After coating, the coating may be dried appropriately at room temperature to about 150°C.

When the hydrophobic oxide fine particles are applied to the surface of the uneven layer 14, the application amount can be appropriately set according to the desired releasability and the like. m ² or so, preferably 0.5 to 20.0 g/m ² or so. By setting it within the above range, more excellent releasability can be obtained over a long period of time, and it is more advantageous in terms of suppression of falling off of the hydrophobic oxide fine particles, cost, and the like.

According to the concrete molding form 10 configured as described above, it is possible to give the concrete a color originating from the natural component eluted from the wooden base material 12 while reducing surface air bubbles.

In addition, since the surface tension of the formwork surface is remarkably increased by the water-repellent layer 16, when the air bubbles in the concrete that are caught in the concrete during pouring come into contact with the surface of the water-repellent layer 16, they tend to spread along the surface. , the air bubbles on the concrete surface become thin and flat along the surface. Moreover, these air bubbles are likely to rise and escape from the concrete surface due to small vibrations applied from the outside. Therefore, according to the present embodiment, it is possible to more reliably reduce air bubbles that cause air pockmarks on the concrete surface. Therefore, the design of the concrete surface can be improved.

[Verification of effects of the present invention]
Next, experiments and results conducted to verify the effects of the present invention will be described.

The types and physical properties of the fillers and resins used in the experiment are shown in FIG. A cedar board processed to a size of about 8 cm wide by 10 cm long was coated with an uneven layer made of a mixture of filler and resin as shown in FIG. All six levels of the cedar boards were pasted on one formwork, concrete was poured in, and the color of the concrete surface was evaluated after demolding. FIG. 3 shows a photograph of the concrete surface, and FIG. 4 shows the results of the hue evaluated in the CIE1976 color space.

As shown in Fig. 4, when resins No. 3 and No. 6 were used, the b* value (yellow component) increased significantly due to the components eluted from the wood, indicating that the concrete surface was colored. It could be confirmed. Therefore, if the characteristics seen in the resins of No. 3 and No. 6 are confirmed in FIG. 2, it can be confirmed that the elongation rate of the resins is small. Since the deformation is small when subjected to an external force, it is thought that fine cracks are likely to occur at the interface between the resin and the filler.

From the above results, it can be seen that by using a resin with a resin elongation rate of 100% or less, more preferably 50% or less, it is possible to make the concrete surface darker in the color of the components eluted from the wood.

<Manufacturing method of formwork for concrete molding>
In the method of manufacturing the concrete molding form according to the present embodiment, the concave-convex layer 14 is provided on the base material 12, and the water-repellent layer 16 is provided on the concave-convex layer 14, so that the above-described concrete molding mold is formed. A method of manufacturing a frame 10 . Concavo-convex layer 14 is made of a mixture of resin 18 and filler 20, as described above. The resin 18 and the filler 20 are composed of a composition that allows components eluted from the wooden base material 12 to reach the concrete C. As shown in FIG. The elongation rate of the resin 18 is preferably 100% or less, more preferably 50% or less. An uneven layer 14 that satisfies the above conditions is applied on the substrate 12 by coating or the like, and a water-repellent layer 16 is applied on the uneven layer 14 by coating or the like to produce the mold 10 as shown in FIG. Doing is equivalent to practicing the present invention.

The construction of the uneven layer 14 on the base material 12 and the construction of the water-repellent layer 16 on the uneven layer 14 are performed not only at a formwork plate manufacturing factory or a precast concrete manufacturing factory, but also at a concrete casting site. It is possible to perform in the steps before and after. In this way, the present invention can be applied to common formwork plates on the market, and can achieve the same effects as described above.

<Method for producing colored concrete>
The method for producing colored concrete according to the present embodiment is a method for producing colored concrete using the concrete molding form 10 described above. It is demolded after hardening. According to this, it is possible to obtain colored concrete in which hollows such as air pocks are reduced and which is colored like wood.

Here, while the concrete is being poured, vibration may be applied by a vibrator so that the compaction energy becomes about 100 to 200 J/L. In other words, when the water-repellent layer 16 is provided on the outermost surface for the purpose of reducing surface air bubbles, while the water-repellent layer 16 remains, it becomes difficult for water in the concrete to reach the wooden base material 12. Natural components eluted from the wooden base material 12 may not easily reach the concrete surface. Since the super-water-repellent mechanism of the water-repellent layer 16 has a nano- to micro-order structure, such a fine mechanism can be destroyed by a certain amount of energy given from the outside. Therefore, the degree of destruction is controlled so as not to impair the effect of reducing surface bubbles.

FIG. 5 shows an example of the relationship between surface air bubbles in a mold coated with a superhydrophobic agent and compaction energy. It can be seen that the number of surface bubbles increases when the compaction energy is 100 J/L or more. This is because the superhydrophobic mechanism is destroyed at 100 J/L or more. Therefore, in order to destroy the superhydrophobic mechanism while maintaining the reduction rate of surface air bubbles by the formwork to some extent (for example, the surface air bubble reduction rate is 90% or more), a compaction energy of about 100 to 200 J / L is applied. It is necessary. It should be noted that this corresponds to the energy required to compact the concrete at a distance of about 5 to 7.5 cm from the surface of the formwork for about 10 seconds using a vibrator. is equivalent to the compaction energy during

The compaction energy can be calculated by the following formula.
E=ρα ² ×t ₀ /4π ² f
Here,
E: Compaction energy ρ: Concrete density α: Maximum acceleration _t0 : Compaction time f: Frequency

Therefore, concrete is poured into the formwork 10 in which the uneven layer 14 and the water-repellent layer 16 are provided on the wooden base material 12, compaction is performed in the same manner as usual, and the resin of the uneven layer 14 stretches. By using a resin with a ratio of 100% or less, more preferably 50% or less, air bubbles on the concrete surface can be reduced, and the characteristic color of the components eluted from the wooden base material 12 can be applied more deeply to the concrete surface. becomes possible.

INDUSTRIAL APPLICABILITY As described above, according to the concrete molding form according to the present invention, there is provided a base material made of a wood material, an uneven layer provided on the base material, and a repellent layer provided on the uneven layer. and a water layer, wherein the concave-convex layer contains a resin and a filler, and the resin and the filler allow components eluted from the base material to reach the concrete outside the water-repellent layer. Since it is a composition capable of achieving this, it is possible to reduce depressions such as air pits that occur on the concrete surface, and to impart a color derived from natural ingredients eluted from the wooden base material to the concrete surface.

In addition, according to another concrete molding form according to the present invention, since the elongation rate of the resin is 100% or less, fine cracks are likely to occur at the interface between the resin and the filler. Components from the base material can reach the concrete through the cracks, so that the surface of the concrete can be given a deeper color derived from the natural components eluted from the woody base material.

In addition, according to another concrete molding form according to the present invention, since the water-repellent layer is a porous layer formed from hydrophobic oxide fine particles, it is possible to effectively eliminate depressions such as air pocks that occur on the concrete surface. can be substantially reduced.

Further, according to the method for manufacturing a concrete molding form according to the present invention, the method for manufacturing the above-mentioned concrete molding form, in which the concave-convex layer and the water-repellent layer are provided on the base material, It is possible to obtain a concrete molding form capable of reducing depressions such as air pocks on the surface and coloring the concrete surface with a color derived from a natural component eluted from a wood base material.

Further, according to the method for producing colored concrete according to the present invention, there is provided a method for producing colored concrete using the concrete molding form described above, wherein fresh concrete is poured into the concrete molding form, and the concrete hardens. Since the mold is removed after the molding, it is possible to obtain a colored concrete in which dents such as air pockmarks are reduced and which is colored in a woody tone.

INDUSTRIAL APPLICABILITY As described above, the formwork for concrete molding, the method for producing the same, and the method for producing colored concrete according to the present invention are useful for reducing air bubbles that cause air pockmarks on the concrete surface. It is suitable for more reliably applying the color derived from natural ingredients to the concrete surface.

REFERENCE SIGNS LIST 10 Concrete molding formwork 12 Base material 14 Concavo-convex layer 16 Water-repellent layer 18 Resin 20 Filler C Concrete

Claims (3)

A mold for concrete molding comprising a substrate made of a woody material, an uneven layer provided on the substrate, and a water-repellent layer provided on the uneven layer,
The uneven layer contains a resin and a filler, and the resin and the filler are compositions that allow components eluted from the base material to reach the concrete outside the water-repellent layer ,
The elongation rate of the resin is 50% or less,
A mold for concrete molding , wherein the water-repellent layer is a porous layer formed of hydrophobic oxide fine particles . A method for manufacturing a concrete molding form according to claim 1 , comprising:
A method for producing a formwork for concrete molding, comprising providing an uneven layer and a water-repellent layer on a base material. A method for producing colored concrete using the concrete molding form according to claim 1 ,
A method for producing colored concrete, comprising the steps of pouring fresh concrete into a formwork for concrete molding, and removing the form after the concrete has hardened.

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