JP2020121454A - Flask for concrete molding, method for producing the same, and method for producing colored concrete - Google Patents

Abstract

To provide a flask for concrete molding capable of reducing hollows such as air pock marks generated in the surface of concrete, and further adding a color derived from natural components eluted from a lumber to the surface of concrete, a method for producing the same, and a method for producing colored concrete.SOLUTION: A flask 10 for concrete molding comprises: a base material 12 made of a woody material; a rugged layer 14 provided on the base material 12; and a water-repellent layer 16 provided on the rugged layer 14. The rugged layer 14 includes: a resin 18; and a filler 20, and the resin 18 and the filler 20 are compositions capable of making components eluted from the base material 12 reach concrete C at the outside of the water-repellent layer 16.SELECTED DRAWING: Figure 1

Description

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

Conventionally, the applicant has already proposed the formwork described in Patent Document 1 as a formwork for concrete molding. The mold 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 porous layer formed of the hydrophobic oxide fine particles has a super-water-repellent effect, which results in molding. Occurrence of pits such as air pockmarks that occur on the surface of the concrete later is significantly reduced, and the designability of the concrete surface can be improved.

JP, 2016-159591, A

By the way, if concrete is placed using a form made of laminated wood such as cedar boards, it is possible to give a grain to the surface of the concrete or a color derived from natural ingredients. When the formwork has a woodgrain-like step that is peculiar to wood, it becomes difficult for bubbles to escape at the step of the woodstep, and as a result, pits such as air pockets are likely to form on the concrete surface as shown in FIG. If a super water-repellent agent is applied to the surface of the form to reduce surface bubbles in order to eliminate pits such as air patters, it will be difficult for water in concrete to reach the wood, and colors derived from natural ingredients that elute from the wood Has a problem that it becomes difficult to attach to the concrete surface. For this reason, it has been required to reduce depressions such as air pockmarks generated on the concrete surface and to make it easier for the color derived from the natural component eluted from the wood to come to the concrete surface.

The present invention has been made in view of the above, and is a mold for concrete molding capable of reducing the depressions such as air pockles generated on the concrete surface and imparting a color derived from a natural component eluted from wood to the concrete surface. An object of the present invention is to provide a frame, a method for manufacturing the frame, and a method for manufacturing colored concrete.

In order to solve the above-mentioned problems and achieve the object, the concrete molding formwork according to the present invention has a base material made of a wood material, an uneven layer provided on the base material, and the uneven layer. A mold for concrete molding, comprising a water repellent layer provided on the concavo-convex layer containing a resin and a filler, wherein the resin and the filler are components of the water repellent layer that are eluted from the base material. The composition is characterized by being able to reach concrete on the outside.

Further, another concrete forming mold according to the present invention is characterized in that, in the above-mentioned invention, the elongation percentage of the resin is 100% or less.

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

Further, a method for producing a concrete forming mold according to the present invention is a method for producing the concrete forming mold described above, characterized in that an uneven layer and a water repellent layer are provided on a base material. ..

Further, the method for producing a colored concrete according to the present invention is a method for producing a colored concrete using the above-mentioned concrete forming form, in which fresh concrete is driven into the concrete forming form, and after the concrete is hardened. It is characterized by demolding with.

According to the concrete molding formwork of the present invention, a concrete comprising a base material made of a wood material, a concavo-convex layer provided on the base material, and a water-repellent layer provided on the concavo-convex layer. A mold for molding, wherein the concavo-convex layer is configured to contain a resin and a filler, and the resin and the filler are compositions capable of allowing the components eluted from the base material to reach the concrete outside the water-repellent layer. Therefore, it is possible to reduce depressions such as air pockmarks generated on the concrete surface and to impart a color derived from a natural component eluted from the wood-based base material to the concrete surface.

Further, according to another concrete molding form of the present invention, since the elongation percentage of the resin is 100% or less, fine cracks easily occur at the interface between the resin and the filler. Since the components from the base material can reach the concrete through the cracks, there is an effect that the color derived from the natural component eluted from the wooden base material can be darkened on the concrete surface.

Further, according to another concrete molding form of the present invention, since the water-repellent layer is a porous layer formed of hydrophobic oxide fine particles, it is more effective to prevent depressions such as air pock generated on the concrete surface. The effect is that it can be reduced.

Further, according to the method for producing a concrete forming mold according to the present invention, it is a method for producing the concrete forming mold described above, in which the concavo-convex layer and the water repellent layer are provided on the base material. The present invention has an effect that it is possible to obtain a concrete molding formwork capable of reducing depressions such as air pockmarks generated on the surface and coloring the color of natural components eluted from a wooden base material on the concrete surface.

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 forming mold described above, in which fresh concrete is driven into the concrete forming mold to harden the concrete. Since it is removed from the mold after that, it is possible to reduce depressions such as air pockmarks and to obtain colored concrete colored in a woody appearance.

FIG. 1 is a cross-sectional view of a form showing an embodiment of a concrete forming form and its manufacturing method and a colored concrete manufacturing method according to the present invention. FIG. 2 is a diagram showing the characteristics (average value) of the used filler and resin (Source: Polymer Dictionary and Chemical Handbook, etc.). FIG. 3 is a photograph showing a concrete surface when a concavo-convex layer, which is a mixture of a filler and various resins, is applied to a cedar board. FIG. 4 is a diagram showing evaluation of the color of the concrete surface by the CIE1976 color space. FIG. 5 is a diagram showing an example of the relationship between the compaction energy and the surface bubble ratio. FIG. 6 is a photograph showing an example of a concrete surface using a cedar board as a mold.

Embodiments of a concrete forming mold, 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. The present invention is not limited to the embodiments.

<Formwork for concrete molding>
FIG. 1 is a schematic sectional view of a preferred embodiment of the present invention. As shown in this figure, a concrete forming mold 10 according to the present embodiment includes a base material 12 that forms a mold body, an uneven layer 14 provided on the base material 12, and an uneven layer 14. And a water-repellent layer 16 provided on the. The water-repellent layer 16 is located on the outermost side of the mold 10 and contacts the concrete C to be molded.

[Base material]
The base material 12 constitutes a mold body. The base material 12 is made of a wood material such as cedar board. The base material 12 contains a natural component for coloring, and this natural component can be eluted to the outside of the base material 12 under the action of water. The shape, size, etc. of the base material 12 can be appropriately designed according to the intended concrete molded body, and a joint bar can be interposed if a groove is to be formed in the molded body. When the joint rod is interposed, the joint rod constitutes a part of the base material 12. Therefore, the base material 12 in this case also includes a joint bar. When the joint bar is interposed, the uneven layer 14 and the water repellent layer 16 may be provided on the surface of the joint bar.

[Rough layer]
The uneven layer 14 is provided on the base material 12. The uneven layer 14 is made of a mixture of the resin 18 and the filler 20. When the concavo-convex layer 14 completely coats the base material 12, the components from the wooden base material 12 cannot be eluted outside the concavo-convex 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. The elongation of the resin 18 is preferably 100% or less, more preferably 50% or less. If a resin having such an elongation is used, fine cracks can be easily generated at the interface between the resin 18 and the filler 20. Since it becomes easy to allow the components eluted from the wooden base material 12 to reach the concrete C outside the water-repellent layer 16 through fine cracks, the color of the components eluted from the wooden base material 12 on the concrete surface can be changed. It is possible to make it darker.

The concavo-convex layer 14 can be formed of, for example, a filling particle-containing layer in which the filler 20 (filling particles) is dispersed in the resin 18 (matrix). By interposing the concavo-convex layer 14, the mold releasability of the concrete forming frame 10 can be maintained for a longer period of time. As the filler 20, filler particles containing at least one of an organic component and an inorganic component can be adopted. Application amount in the case of providing the concavo-convex layer 14 on the surface of the substrate 12, solids, for example, 0.1 to 100 g / ^{m 2,} preferably about may be set to 1.0~20.0g / ^{m 2} approximately. By setting the amount within the above range, more excellent adhesion of the hydrophobic oxide fine particles of the water-repellent layer 16 can be obtained for a long period of time, and the hydrophobic oxide fine particles coated on the uneven layer 14 can be prevented from falling off. It is also advantageous in terms of durability and the like. The method of applying the uneven layer 14 is not particularly limited, but for example, a printing method, a dropping method, or the like can be used in addition to a coating method by spraying, brush, roller, dipping, or the like. At the time of application (coating), the following matrix may be diluted with an appropriate solvent, and after application, it may be appropriately dried at room temperature to about 150°C.

Examples of the inorganic component include 1) metals such as aluminum, copper, iron, titanium, silver and calcium, or alloys or intermetallic compounds containing these, 2) silicon oxide, aluminum oxide, zirconium oxide, titanium oxide, iron oxide and the like. Oxides, 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 can be preferably used.

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

As the above-mentioned filling particles, in addition to particles made of an inorganic component or particles made of an organic component, particles containing both an inorganic component and an organic component can be used. Among these, particularly, at least one kind of acrylic resin particles, polyethylene resin particles, hydrophilic silica particles, calcium phosphate particles, carbon powder, calcined calcium particles, uncalcined calcium particles, calcium stearate particles, aluminum oxide particles and the like can be used. More preferable.

Considering the thickness of the coating film used for the mold, the average particle diameter of the filled particles (by a laser diffraction type 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. More preferably, 20 to 50 μm is most preferable. If it is less than 0.3 μm, it is not suitable in terms of handleability and formation of irregularities. On the other hand, when it exceeds 100 μm, it is unsuitable in terms of dropping of the filler particles, dispersibility and the like. The shape of the filling particles is not limited, and may be, for example, spherical, spheroidal, indefinite, teardrop, flat, hollow, or porous.

As the resin 18 (matrix) that constitutes the uneven layer 14 and holds the filler 20 (filled particles) together, a thermoplastic resin, a thermosetting resin, rubber, an elastomer, wax or the like can be adopted. The content of the filling particles in the matrix can be appropriately changed depending on the material of the matrix, the type of the filling particles, the desired physical properties, etc., but is generally preferably 1 to 80% by weight based on the weight of the solid content, and 3 to 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, but generally, the filler particles are added to a raw material for forming the matrix (for example, a composition containing a thermoplastic resin). The method of blending may be mentioned. The mixing method may be either dry mixing or wet mixing.

When the matrix is a thermoplastic resin, generally, the main component of the thermoplastic resin layer is 1) a thermoplastic resin or a monomer or oligomer constituting the thermoplastic resin, 2) a solvent, 3) a cross-linking agent, etc., if necessary, Filling particles may be added and mixed into the mixture. A well-known thermoplastic resin can be adopted as the thermoplastic resin. For example, acrylic resin, polystyrene, ABS resin, vinyl chloride resin, polyethylene resin, polypropylene resin, polyamide resin, polycarbonate, polyacetal, fluorine resin, silicone resin, polyester resin, and the like, blended resins thereof, and components thereof. A copolymer containing a combination of the above monomers, a modified resin, and the like can be used.

When the matrix is a thermosetting resin, for example, phenol resin, urea resin, melamine resin, unsaturated polyester resin, epoxy resin, silicon resin or the like can be adopted. 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 concrete C to be shaped comes into contact with the water repellent layer 16. The water-repellent layer 16 is a layer having a water-repellent surface having a contact angle α with water of 130° or more, and more preferably a layer having a super-water-repellent surface of 150° or more.

Here, the water repellency refers to a property that represents poor wettability with water, and the contact angle of a water drop placed on the surface of the water repellent layer 16 is an index of water repellency. Generally, when the contact angle is 90° or more, it is water repellent, when it is 110° to 150°, it is highly water repellent, and when it is 150° or more, it 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 realize a contact angle of more than 120°, it is necessary to process the surface shape into a special one as described later.

According to the above configuration, the surface tension of the surface of the mold is significantly increased by the water repellent layer 16, so that when the bubbles in the concrete carried during the driving contact 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 along the surface than before. Moreover, the bubbles rise due to a small vibration applied from the outside of the base material 12 and easily escape from the concrete surface. Therefore, according to the present embodiment, it is possible to more reliably reduce the air bubbles that cause air dust on the concrete surface.

The water-repellent layer 16 can be composed of a porous layer made of hydrophobic oxide fine particles, a fluororesin, or the like. When the water-repellent layer 16 is composed of a porous layer composed of hydrophobic oxide fine particles, the hydrophobic oxide fine particles as a raw material are not particularly limited as long as they have hydrophobicity, and are hydrophobicized by surface treatment. It may be For example, it is possible to use fine particles in which hydrophilic oxide fine particles are surface-treated with a silane coupling agent or the like to have a hydrophobic surface state. The type of oxide is not particularly limited as long as it has hydrophobicity. For example, at least one kind of silica (silicon dioxide), alumina, titania and the like can be used. Known or commercially available products can be adopted as these.

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

Examples of titania include the product name “AEROXIDE TiO2 T805” (manufactured by Evonik Degussa). Examples of the alumina include fine particles whose surface is made hydrophobic by treating a product name “AEROXIDE Alu C” (manufactured by Evonik Degussa) with a silane coupling agent. AEROXIDE is a registered trademark.

Among these, hydrophobic silica fine particles can be preferably used. Above all, hydrophobic silica fine particles having a trimethylsilyl group on the surface are preferable in that more excellent water repellency can be obtained. Examples of commercially available products corresponding to this include, for example, "AEROSIL RX200", "AEROSIL RX300", "AEROSIL NX90G" (above, manufactured by Nippon Aerosil Co., Ltd.), "AEROSIL R812", "AEROSIL R812S", "AEROSIL R8200" ( Above, 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 diameter within the above range, a gas such as air can be retained in the voids in the aggregate, and as a result, a porous structure is formed and excellent releasability can be exhibited. Since this agglomerated state is maintained even after adhering to the surface of the uneven layer 14, 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 the concrete forming mold 10 having a surface of a porous structure having a three-dimensional mesh shape.

The hydrophobic oxide fine particle water-repellent layer 16 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, and 0 More preferably about 0.5 to 20 μm. By forming in such a porous state, the layer can contain a large amount of air, and more excellent releasability can be exhibited.

In the present invention, the average primary particle diameter can be measured with a scanning electron microscope (FE-SEM), and when the resolution of the scanning electron microscope is low, another electron such as a transmission electron microscope is used. You may carry out using a microscope together. Specifically, when the particle shape is spherical, the diameter is considered, and when it is non-spherical, the average value of the longest diameter and the shortest diameter is regarded as the diameter, and 50 particles arbitrarily selected by observation with a scanning electron microscope or the like. The average of the diameters of the particles is defined as the average primary particle diameter.

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

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

When the above dispersion liquid is used, the solvent used for the dispersion liquid 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 trace amount of a dispersant, a colorant, an anti-settling agent, a viscosity modifier, etc. can be used together. The dispersion amount of the hydrophobic oxide fine particles in the solvent is usually about 10 to 300 g/L (liter), preferably about 30 to 100 g/L.

The method of applying the dispersion liquid is not limited, and for example, a coating method such as spraying, brushing, roller, dipping, etc., as well as a printing method (inkjet printing, screen printing, gravure printing), a dropping method, etc. may be adopted. it can. After coating, it may be appropriately dried at room temperature to about 150°C.

When the hydrophobic oxide fine particles are applied to the surface of the concavo-convex layer 14, the application amount can be appropriately set usually according to the desired releasability and the like. m ^2, preferably about may be set to 0.5～20.0G / ^{m 2} approximately. By setting the amount within the above range, more excellent mold releasability can be obtained for a long period of time, and it is further advantageous in terms of suppression of dropping of the hydrophobic oxide fine particles and cost.

According to the concrete-forming mold 10 configured as described above, it is possible to add a color derived from a natural component eluted from the wooden base material 12 to the concrete while reducing surface bubbles.

In addition, since the surface tension of the surface of the mold is remarkably increased by the water repellent layer 16, when air bubbles in the concrete caught during driving contact the surface of the water repellent layer 16, they easily spread along the surface. , The bubbles on the concrete surface are thin and flat along the surface. Moreover, the bubbles are easily lifted by a small vibration applied from the outside and easily escape from the concrete surface. Therefore, according to the present embodiment, it is possible to more reliably reduce the air bubbles that cause air dust on the concrete surface. Therefore, the design of the concrete surface can be improved.

[Verification of Effect of the Present Invention]
Next, the experiments and results performed to verify the effects of the present invention will be described.

The types and physical properties of the filler and the resin used in the experiment are as shown in FIG. The concavo-convex layer, which is a mixture of the filler and the resin shown in FIG. 2, was applied to a cedar plate processed to have a width of 8 cm and a length of 10 cm. All of the 6 levels of this cedar board were attached to a single formwork, concrete was poured in, and the color tone of the concrete surface after demolding was evaluated. FIG. 3 shows a photograph of the concrete surface, and FIG. 4 shows the result of the tint evaluated in the CIE1976 color space.

As shown in Fig. 4, when No. 3 and No. 6 resins were used, the b* value (yellow component) significantly increased due to the components eluted from the wood, and the concrete surface was colored. It could be confirmed. Therefore, by confirming the characteristics of No. 3 and No. 6 resins in FIG. 2, it can be confirmed that the elongation percentage of the resin is small. Since the deformation is small when an external force is applied, it is considered 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 having a resin elongation rate of 100% or less, more preferably 50% or less, it is possible to make the color of the component eluted from wood on the concrete surface darker.

<Method for manufacturing concrete forming formwork>
In the method for manufacturing a concrete forming mold according to the present embodiment, the concavo-convex layer 14 is provided on the base material 12, and the water-repellent layer 16 is provided on the concavo-convex layer 14, to thereby form the concrete forming mold. This is a method of manufacturing the frame 10. The uneven layer 14 is made of a mixture of the resin 18 and the filler 20 as described above. 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. The elongation of the resin 18 is preferably 100% or less, more preferably 50% or less. An uneven layer 14 satisfying the above conditions is applied on the base material 12 by coating or the like, and a water repellent layer 16 is applied on the uneven layer 14 by application or the like to manufacture the mold 10 as shown in FIG. Doing is equivalent to implementing the present invention.

The construction of the concavo-convex layer 14 on the base material 12 and the construction of the water-repellent layer 16 on the concavo-convex layer 14 are carried out not only in the formwork board manufacturing plant and the precast concrete manufacturing plant but also in the formwork assembly at the concrete pouring site. It is possible to perform in the process before and behind. As described above, the present invention can be applied to a general mold plate on the market, and can achieve the same effects as those 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 above-mentioned concrete forming mold 10, in which fresh concrete is driven into the concrete forming mold 10 and concrete C It is to be removed from the mold after it is cured. According to this, it is possible to obtain a colored concrete in which depressions such as air peat are reduced and which is colored like wood.

Here, while pouring concrete, vibration may be applied by a vibrator so that the compacting energy is about 100 to 200 J/L. That is, when the water-repellent layer 16 is provided on the outermost surface for the purpose of reducing surface bubbles, it becomes difficult for the water content of the concrete to reach the wooden base material 12 while the water-repellent layer 16 remains. There is a possibility that 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 applied from the outside. Therefore, the degree of destruction is controlled to the extent that the action of reducing surface bubbles is not impaired.

FIG. 5 shows an example of the relationship between compaction energy and surface bubbles formed by a mold coated with a super water repellent. It can be seen that the surface bubbles are increased when the compaction energy is 100 J/L or more. This is because the super water repellent mechanism is destroyed at 100 J/L or more. Therefore, in order to destroy the super water-repellent mechanism while maintaining the reduction rate of the surface bubbles by the mold to some extent (for example, the surface bubble reduction rate of 90% or more), compaction energy of about 100 to 200 J/L is applied. It is necessary. This is equivalent to the energy for compacting concrete at a position of about 5 to 7.5 cm away from the surface of the mold with a vibrator for about 10 seconds, and the compacting work to be performed in normal construction. It is equivalent to the compaction energy at the time of.

The compaction energy can be calculated by the following formula.
E=ρα ² ×t ₀ /4π ² f
here,
E: Compaction energy ρ: Density of concrete α: Maximum acceleration t ₀ : Compaction time f: Frequency

Therefore, concrete is poured into the mold 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 is expanded. By using a resin having a ratio of 100% or less, more preferably 50% or less, it is possible to reduce the bubbles on the concrete surface, while darkening the characteristic color of the component eluted from the wooden base material 12 to the concrete surface. It becomes possible.

As described above, according to the concrete forming mold of the present invention, the base material made of a wood material, the concavo-convex layer provided on the base material, and the repellent layer provided on the concavo-convex layer. A mold for concrete molding comprising a water layer, wherein the uneven layer is configured to include a resin and a filler, and the resin and the filler allow the components eluted from the base material to reach the concrete outside the water repellent layer. Since it is a composition that can be used, it is possible to reduce depressions such as air pockles that occur on the concrete surface, and to impart a color derived from a natural component eluted from a wood-based base material to the concrete surface.

Further, according to another concrete molding form of the present invention, since the elongation percentage of the resin is 100% or less, fine cracks easily occur at the interface between the resin and the filler. Since the components from the base material can reach the concrete through the cracks, the color derived from the natural component eluted from the wooden base material can be darkened on the concrete surface.

Further, according to another concrete molding form of the present invention, since the water-repellent layer is a porous layer formed of hydrophobic oxide fine particles, it is more effective to prevent depressions such as air pock generated on the concrete surface. Can be reduced.

Further, according to the method for producing a concrete forming mold according to the present invention, it is a method for producing the concrete forming mold described above, in which the concavo-convex layer and the water repellent layer are provided on the base material. It is possible to obtain a concrete forming mold which can reduce depressions such as air pockmarks generated on the surface and can color the concrete surface with a color derived from a natural component eluted from a wood-based substrate.

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 forming mold described above, in which fresh concrete is driven into the concrete forming mold to harden the concrete. After that, the mold is removed from the mold, so that it is possible to obtain colored concrete in which depressions such as air pockmarks are reduced and which is colored in a woody appearance.

As described above, the concrete forming mold and 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 pock on the concrete surface, and are particularly eluted from wood. It is suitable for surely attaching the color derived from natural ingredients to the concrete surface.

10 Concrete Formwork 12 Base Material 14 Concavo-convex Layer 16 Water Repellent Layer 18 Resin 20 Filler C Concrete

Claims (5)

A mold for concrete molding comprising a base material made of a wood material, an uneven layer provided on the base material, and a water-repellent layer provided on the uneven layer,
The concavo-convex layer is configured to include a resin and a filler, and the resin and the filler are a composition capable of allowing the components eluted from the base material to reach the concrete outside the water repellent layer. Formwork. The mold for concrete molding according to claim 1, wherein the elongation percentage of the resin is 100% or less. The concrete molding form according to claim 1 or 2, wherein the water-repellent layer is a porous layer formed of hydrophobic oxide fine particles. A method for manufacturing the concrete forming mold according to any one of claims 1 to 3,
A method for producing a concrete-molding formwork, which comprises providing an uneven layer and a water-repellent layer on a base material. A method for producing colored concrete using the concrete forming mold according to any one of claims 1 to 3,
A method for producing a colored concrete, which comprises injecting fresh concrete into a concrete forming frame and removing the mold after the concrete is hardened.