JPH10159331A - Concrete placing form and manufacture of concrete product by using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect a concrete surface simultaneously when concrete is placed by distributing powder or fine grains of a silicic acid compound to crystallize by reacting with the alkali content, over a contact surface with a concrete material through a pressure sensitive adhesive whose adhesive strength reduces by moisture when the concrete material is placed by using a form surface as the contact surface with the concrete material. SOLUTION: A silicic acid compound 3 of powder or a fine grain state is distributed over a form surface 4 being a contact surface with a concrete material of a steel plate-made form 1 through a pressure sensitive adhesive layer 2. The form 1 and the other form are arranged in a frontally opposed condition, and a molding mold is also made. Next, a concrete material is placed in the molding mold. When the form is separated after the concrete material is cured and hardened, in the pressure sensitive adhesive layer 2, adhesive strength reduces by moisture or the like in the concrete material, and the silicic acid compound 3 is transferred to and buried in a surface of a concrete product. At curing and hardening time, the silicic acid compound 3 transferred to and buried in the concrete material, dissolves, and crystallizes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete casting formwork capable of protecting a concrete surface at the same time as concrete placing, and a method of manufacturing a concrete product using the same.

[0002]

2. Description of the Related Art Conventionally, in a concrete product used near a seashore or the like, salt has penetrated from minute pores on the concrete surface, and the concrete material has been eroded by the salt, so-called salt damage has been a problem. . Therefore,
To protect concrete products from such salt damage,
BACKGROUND ART An organic or inorganic paint is sprayed and applied to the surface of a concrete product.

[0003]

However, the above-mentioned organic or inorganic paints need to be sprayed and applied after the concrete has been cast once, sufficiently cured and cured, and the concrete has been stabilized. There is. For this reason,
After casting the concrete, it is necessary to provide a sufficient curing and hardening period, and there is a problem that the construction period becomes longer. In addition, formwork and scaffolds were built to cast concrete, and after curing and hardening, they were temporarily removed, and then
Since it is necessary to spray paint or the like, scaffolds and the like have to be reassembled, so that the cost for temporary construction of the scaffolds and the like is increased, and the construction period is further lengthened. In addition, the concrete product obtained in this manner has a problem in durability because the protective effect is lost when the surface is peeled off.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a concrete pouring formwork capable of protecting a concrete surface simultaneously with concrete pouring, and a method of manufacturing a concrete product using the same. Aim.

[0005]

Means for Solving the Problems In order to achieve the above object, a concrete casting mold according to the present invention is used for casting a concrete material with the surface of the mold being in contact with the concrete material. The gist of the present invention is that a powder or fine particles of the following (A) is distributed on the contact surface through an adhesive whose adhesive strength is reduced by moisture or the like in the concrete material. (A) A silicate compound which crystallizes by reacting with an alkali component in a concrete material.

Further, in the method for producing a concrete product of the present invention, the following powder or fine particles (A) are distributed on the surface of a mold via an adhesive whose adhesive strength is reduced by moisture or the like in the concrete material. A concrete form is prepared, a concrete material is poured with the form surface of the form as a contact surface, and the adhesive force of the adhesive is reduced by the moisture or the like in the concrete material to obtain the powder of (A). Alternatively, the gist is to transfer and bury the fine particles on the concrete surface and to crystallize the powder or fine particles (A) buried on the concrete surface by reacting with the alkali component in the concrete material. (A) A silicate compound which crystallizes by reacting with an alkali component in a concrete material.

That is, in the concrete casting formwork of the present invention, powder or fine particles of a silicate compound are applied to the contact surface with the concrete material via an adhesive whose adhesive force is reduced by moisture or the like in the concrete material. Are distributed. Then, when the concrete material is cast with the form surface on which the powder or fine particles of the silicate compound is distributed as a contact surface,
The adhesive force of the adhesive decreases due to the moisture and the like in the concrete material, and powder or fine particles of the silicate compound are transferred and embedded in the surface of the concrete material. For this reason, the powder or fine granules of the silicate compound as the concrete protecting agent can be poured into the surface of the concrete product at the same time as the concrete is poured. Then, since the powder or fine particles of the silicate compound on the surface reacts with an alkali component in the concrete material and crystallizes, a concrete product having a protected surface is obtained.

Thus, the concrete material is poured,
Since the concrete surface can be protected at the same time, there is no need to provide a period for curing and hardening the concrete before painting as in the related art, and the construction period is shortened. Moreover, after removing the formwork and scaffolds that were provided when casting concrete, there is no need to reassemble the scaffolds, etc., which can reduce temporary construction costs for scaffolds, lower construction costs, and further shorten the construction period. Will be able to Moreover, since a powdery or fine-grained silicate compound is used as a concrete protective agent, a certain amount of a non-crystallized silicate compound remains in the concrete product even after curing and hardening of the concrete. For this reason, rainwater or the like infiltrates into the obtained concrete product, and the alkali component in the concrete dissolves out. The alkali component crystallizes the amorphous silicate compound, and the effect of protecting the surface of the concrete product is exhibited for a long time. And the durability is remarkably improved.

Further, the concrete casting formwork of the present invention is provided with a sheet in which the powder or fine particles of the above (A) is distributed via an adhesive whose adhesive strength is reduced by moisture or the like in the concrete material. When the sheet is detachably attached to the surface of the mold with the distribution surface of the powder or fine particles outside, when the sheet surface is a contact surface with the concrete material, Even in the case of molds having various shapes and dimensions, it is only necessary to cut and attach the above-mentioned sheets prepared in large quantities in advance to the molds and adhere them. Therefore, preparation of the formwork is simplified, and it is possible to easily cope with on-site construction or the like. Moreover, the used formwork can also be easily regenerated simply by replacing the sheet by site construction or the like.

Further, in the concrete casting formwork of the present invention, a layer made of the above-mentioned adhesive is formed on the contact surface with the concrete material, and the powder or fine particles of the above (A) is formed on the surface of this adhesive layer. When the particles are distributed, the amount of powder or fine particles of the silicate compound adhered to the surface of the mold can be easily adjusted. Therefore, it is possible to easily adjust the amount of the silicate compound to be implanted in consideration of the environment in which the concrete product is used and the like, and it is particularly suitable for a case where a mold is produced in a large variety of small lots.

Further, in the concrete casting formwork of the present invention, a layer of a mixture obtained by previously mixing the powder or the fine particles of (A) with the adhesive is formed on a contact surface with the concrete material. In this case, the mold of the present invention can be obtained only by applying a mixture of powder or fine particles of an adhesive and a silicate compound to the surface of the mold. For this reason,
The manufacturing process of the mold is simple, and it is particularly suitable for mass production of the mold.

Further, in the concrete casting mold of the present invention, the mixture layer is formed on the contact surface with the concrete material, and the powder or fine particles of (A) is distributed on the surface of the mixture layer. When it is attached, the amount of implantation of the silicate compound can be easily adjusted, and a thick protective layer can be formed.

The method for producing a concrete product of the present invention is as follows.
Using the formwork of the present invention, a concrete product whose surface is protected can be easily obtained. In the concrete product thus obtained, a protective layer in which a silicate compound is crystallized is formed on the surface, thereby preventing concrete erosion due to salt intrusion. Moreover, the amorphous silicate compound remaining in the concrete product after curing and hardening of the concrete is crystallized by the alkali dissolved into the infiltrating rainwater and the like, and the effect of protecting the surface of the concrete product is exerted for a long time.

[0014]

Next, an embodiment of the present invention will be described.

[0015] The formwork of the present invention is a formwork used when the concrete material is cast with the surface of the formwork in contact with the concrete material. Powder or fine granules of the silicate compound are distributed via an adhesive which reduces the adhesive strength.

The above-mentioned silicate compound protects concrete products by reacting with water and the like in the concrete material to crystallize, and preferably contains silica as a main component and contains sodium, potassium, chlorine, aluminum, etc. The inorganic silicate polymer containing is used. Also,
The silicate compound is used in the form of powder or fine particles. By being in the form of powder or fine particles, the silicate compound in an amorphous state remains to some extent in the concrete product even after the concrete curing and hardening. For this reason, the alkali content in the concrete starts to melt due to the infiltration of rainwater, water vapor, or the like, and the crystallization of the amorphous silicate compound proceeds due to the alkali content, whereby the surface protection function is exerted for a long time.

The above-mentioned silicate compound powder or fine granules may be used as they are, but may be mixed and dispersed in deionized water or the like in advance and added with an auxiliary agent such as an adhesion promoter or a curing accelerator. It is desirable to use a mixed and dispersed solution in which a curing agent mainly containing a zinc compound such as zinc hydroxide, zinc sulfate or zinc oxide is mixed. By doing so, the powder or fine particles of the silicate compound can be evenly distributed on the surface of the mold, and there is an advantage that waste of the silicate compound is reduced and the quality of the obtained concrete product is improved. In addition, you may make it mix the coloring pigment of concrete, a filler, etc. with the said mixed dispersion solution according to a use purpose.

The mold is made of various materials such as wood, steel plate, styrofoam, urethane resin, and rubber, and is not particularly limited. Further, in this formwork, the contact surface with the concrete material can be formed in an uneven pattern surface. Thereby, the concrete product having the uneven pattern can be produced by transferring the uneven pattern to the concrete surface.

As the above-mentioned pressure-sensitive adhesive, it is preferable to use a pressure-sensitive adhesive or an adhesive whose adhesive force or the like is reduced or disappears due to moisture, alkali components and the like in the concrete material.
Examples of the adhesive whose adhesive strength is reduced or disappears upon meeting water in the concrete material include a methylcellulose adhesive, a polyvinyl alcohol adhesive, and a starch-based adhesive. Examples of the thing that the adhesive strength or the like decreases or disappears upon meeting with the alkali component in the concrete material include a two-part acrylic adhesive.

In the formwork of the present invention, powder or fine particles of the silicate compound are distributed on the surface of the formwork that is to be in contact with the concrete material via an adhesive.

As a method of distributing the above-mentioned silicate compound powder or fine particles on the surface of the mold via an adhesive or the like, for example, the silicate compound powder or fine particles are mixed and dispersed in deionized water in advance to promote curing. A mixed and dispersed solution in which a curing agent is mixed with a material to which an agent or the like has been added is prepared, and an adhesive is applied to the surface of the mold and dried once, and the mixed and dispersed solution is applied to the surface of the adhesive layer. And drying again. Further, a solution of the pressure-sensitive adhesive and the above-mentioned mixed dispersion are mixed at a predetermined mixing ratio, water and the like are added to prepare a viscosity-adjusted mixed adjustment liquid, and this mixed adjustment liquid is applied to the surface of the mold and dried. It may be. Furthermore, after applying the above-mentioned mixed adjustment liquid to the mold surface and drying it, the above-mentioned mixed dispersion solution may be applied and dried again.

When the silicate compound powder or fine granules are used as they are, for example, an adhesive is applied in advance to the surface of the mold, and the silicate compound powder or fine particles are coated on the adhesive layer. Fine particles are scattered and fixed using the adhesive force of the adhesive, or partially embedded or completely embedded in the adhesive layer by applying pressure or the like. Alternatively, a predetermined amount of silicate compound powder or fine granules may be mixed in advance with the adhesive solution, and the mixture may be applied to the surface of the mold. Further, the above-mentioned silicate compound powder or fine granules may be sprayed on the mold surface, and then the adhesive may be sprayed or sprayed. Also,
After applying and mixing the above mixed adjustment liquid on the mold surface and drying,
Powder or fine particles of a silicate compound may be sprayed or the like.

The application of the pressure-sensitive adhesive, the mixed dispersion solution, the mixed adjustment solution, and the like can be performed by, for example, spray coating using a spray, brush coating using a brush, roll coating, or the like.
It is performed by various methods such as pouring and dipping, and is not particularly limited. Also, drying after coating, for example,
It is performed by various methods such as natural drying, hot air drying, and vacuum drying.
There is no particular limitation.

Next, the mold of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the mold of the present invention. The mold 1 is made of a steel plate, and a powdery or fine-grained silicate compound 3 is distributed via a pressure-sensitive adhesive layer 2 on a mold surface 4 serving as a contact surface with a concrete material.

A concrete product is manufactured using the mold 1 as follows, for example. That is, first, as shown in FIG. 2, the formwork 1 of the present invention and another formwork 16 are placed in a front-facing state so that the formwork surface 4 of the formwork 1 is a contact surface with a concrete material. A plate member 17 which is arranged and further closes a bottom opening and a plate member which closes a side opening (not shown)
Is used to prepare a molding die. Next, the concrete material 5 is poured into the molding die. Then, after the concrete material 5 is cured and hardened, the mold 1 is peeled off from the produced concrete product 6, as shown in FIG. In this series of steps, the adhesive force of the pressure-sensitive adhesive layer 2 decreases due to moisture in the concrete material, and the silicate compound 3 distributed on the mold surface 4 of the mold 1 is transferred and embedded in the surface 7 of the concrete product 6. You. Then, when the concrete material 5 is cured and hardened, as shown in FIG. 4, the silicate compound 3 transferred and embedded in the concrete material 5 gradually dissolves, reacts with an alkali component in the concrete material 5, and reacts with the silicate compound. 3
Perimeter (ie surface of concrete product)
In this case, crystallization occurs, and this portion is vitrified.

The concrete product 6 thus obtained has a protective layer formed on the surface to repel water applied to the surface or to improve the strength of the surface portion, and the concrete is eroded by salt intrusion. Is also prevented. In addition, since the silicate compound 3 is in the form of powder or fine particles, a certain amount of amorphous silicate compound 3 remains in the concrete product 6 after curing and hardening of the concrete material 5. When rainwater or the like infiltrates into the concrete product 6, alkali in the concrete melts out, and the amorphous silicate compound 3 is crystallized by the alkali, and the effect of protecting the surface of the concrete product 6 is exerted for a long time. You.

Since the silicate compound 3 is fixed to the mold surface 4 by using an adhesive whose adhesive strength is reduced due to moisture or the like in the concrete material 5, the concrete material 5 is cured and cured during the curing. Since the adhesive force of the pressure-sensitive adhesive layer 2 fixing the silicate compound 3 to the mold surface 4 is weakened or disappears due to moisture in the material 5, the mold 1 is separated from the surface 7 of the concrete product 6. Can be easily performed.

FIG. 5 shows a mold according to a second embodiment of the present invention. The mold 20 includes a sheet 8 on which the silicate compound 3 is distributed via the adhesive layer 2, and the sheet 8 is detachably attached to the mold surface 4 with the distribution surface of the silicate compound 3 on the outside. Have been. And the sheet surface 9 is a contact surface with the concrete material. This also has the same operational effects as those shown in FIG. Moreover, in this case, it is only necessary to adhere the sheet 8 on which the silicate compound 3 is distributed via the pressure-sensitive adhesive layer 2 to the mold surface 4, so that even in the case of the mold 1 a having various shapes and dimensions, The sheet 8 prepared in advance in a large amount can be attached by cutting or the like according to the formwork. Therefore, preparation of the mold 1a is simplified, and it is possible to easily cope with the on-site construction or the like. Moreover, after use, the sheet 8 can be easily regenerated simply by replacing the sheet 8 by on-site construction or the like.

In the mold 20 of the second embodiment, the material of the sheet 8 is not particularly limited, but may be polyvinyl chloride, polyethylene terephthalate, or the like.
In addition to various resins such as polyester, polystyrene, polyamide, and acrylic, various materials such as paper and rubber are used. As a method of attaching the sheet 8 to the form surface 4, various methods such as fixing with a pin or a nail, and bonding with a double-sided adhesive tape or an adhesive are performed, and are particularly limited. is not.

FIG. 6 shows a mold according to a third embodiment of the present invention. The mold 21 is made of a rigid urethane foam resin. Such a mold frame 21 is manufactured by injecting a liquid urethane foam resin into a mold and curing it, and has a foam layer 10 inside, and a smooth and dense integral skin layer 11 in the surface layer portion. One surface is formed on the uneven pattern transfer surface 12, and the other surface is formed on the flat back surface 13. The silicate compound 3 is distributed on the uneven pattern transfer surface 12 via the pressure-sensitive adhesive layer 2. This also has the same operational effects as those shown in FIG. Moreover, in this device, the silicate compound 3 is transferred and buried in the concrete material by simultaneously laying the concrete material with the uneven pattern transfer surface 12 as a contact surface, and at the same time, the uneven pattern is transferred to the surface of the concrete material. A concrete product having a pattern or the like can be obtained. In addition, since it is made of rigid urethane foam resin, the above-mentioned uneven surface 12 can be easily formed by molding.

FIG. 7 shows a mold according to a fourth embodiment of the present invention. The mold frame 22 includes a mold frame 14 made of a rigid urethane resin having an uneven pattern transfer surface 12 on the surface, and a sheet 15 formed in an uneven pattern shape corresponding to the uneven pattern transfer surface 12. . The silicate compound 3 is distributed on the surface of the sheet 15 via the pressure-sensitive adhesive layer 2. This also has the same operational effects as those shown in FIG. In addition, it is possible to recycle only by replacing the sheet 15, and it is also possible to obtain a concrete product having a natural stone-like uneven pattern.

[0033]

As described above, according to the concrete casting mold of the present invention, when the concrete material is cast with the surface of the mold in which the powder or fine particles of the silicate compound is distributed as a contact surface, The adhesive force of the adhesive decreases due to the moisture and the like in the concrete material, and powder or fine particles of the silicate compound are transferred and embedded in the surface of the concrete material. For this reason, the powder or fine granules of the silicate compound as the concrete protecting agent can be poured into the surface of the concrete product at the same time as the concrete is poured. Then, since the powder or fine particles of the silicate compound on the surface reacts with an alkali component in the concrete material and crystallizes, a concrete product having a protected surface is obtained.

Thus, the concrete material is poured,
Since the concrete surface can be protected at the same time, there is no need to provide a period for curing and hardening the concrete before painting as in the related art, and the construction period is shortened. Moreover, after removing the formwork and scaffolds that were provided when casting concrete, there is no need to reassemble the scaffolds, etc., which can reduce temporary construction costs for scaffolds, lower construction costs, and further shorten the construction period. Will be able to Moreover, since a powdery or fine-grained silicate compound is used as a concrete protective agent, a certain amount of a non-crystallized silicate compound remains in the concrete product even after curing and hardening of the concrete. For this reason, rainwater or the like infiltrates into the obtained concrete product, and the alkali component in the concrete dissolves out. The alkali component crystallizes the amorphous silicate compound, and the effect of protecting the surface of the concrete product is exhibited for a long time. And the durability is remarkably improved.

Next, an embodiment will be described.

[0036]

EXAMPLE 1 First, a rigid urethane foam mold (900 mm wide × 1200 mm long × 50 m thick) shown in FIG.
m) was prepared. On the other hand, powder or fine particles of a silicate compound are mixed and dispersed in deionized water in advance, and an adhesion-imparting agent and a hardening accelerator are added to reduce the concentration of active ingredient to 7
It was adjusted to 4.5% (viscosity: 12 CPS / 20 ° C.). A mixed dispersion solution in which a curing agent was mixed with this adjustment liquid was prepared (Crystalizer GTW: manufactured by Chubu Shinto Co., Ltd.).

Then, a pressure-sensitive adhesive (starch-based adhesive) is applied to the concave and convex pattern transfer surface of the decorative mold frame, and the thickness is 0.2 mm.
Was formed and air-dried. The amount of the pressure-sensitive adhesive applied was 200 g / m ² . Subsequently, the mixed dispersion solution was applied to the surface of the dried pressure-sensitive adhesive layer, followed by natural drying to obtain a mold of the present invention.
At this time, the applied amount of the mixed dispersion solution was 200 g / m 2.
^{And 2} .

[0038]

Example 2 A mold of the present invention was obtained in the same manner as in Example 1 except that the pressure-sensitive adhesive of Example 1 was changed to a polyvinyl alcohol adhesive.

[0039]

Example 3 A mold of the present invention was obtained in the same manner as in Example 1, except that the adhesive of Example 1 was changed to a methylcellulose adhesive.

[0040]

Example 4 A mold of the present invention was obtained in the same manner as in Example 1, except that the pressure-sensitive adhesive of Example 1 was changed to a two-pack acrylic pressure-sensitive adhesive.

[0041]

Example 5: An adhesive (starch-based adhesive) and Example 1
Was mixed with the mixed dispersion solution prepared in the same manner as described above in the same weight ratio, and diluted by adding water to obtain a viscosity of 800.
A mixed adjustment liquid adjusted to 0 CPS / 20 ° C. was prepared.

Then, the above-mentioned mixed and adjusted liquid was applied to the surface of a mold similar to that in Example 1, and then naturally dried to obtain a mold of the present invention. At this time, the application amount of the mixed adjustment liquid was 400 g / m ² .

[0043]

Example 6 A mold of the present invention was obtained in the same manner as in Example 5, except that the adhesive in Example 5 was changed to a polyvinyl alcohol adhesive.

[0044]

Example 7 A mold of the present invention was obtained in the same manner as in Example 5, except that the adhesive of Example 5 was changed to a methylcellulose adhesive.

[0045]

Example 8 A mold of the present invention was obtained in the same manner as in Example 5, except that the pressure-sensitive adhesive of Example 5 was changed to a two-component acrylic pressure-sensitive adhesive.

[0046]

Embodiment 9 The amount of the mixture adjusting solution of Embodiment 5 was 500 g.
/ M ² , except that the mold was obtained in the same manner as in Example 5.

[0047]

Example 10 A pressure-sensitive adhesive (starch-based adhesive) and a mixed dispersion prepared in the same manner as in Example 1 were mixed at the same weight ratio, and diluted with water to obtain a viscosity of 80.
A mixed adjustment liquid adjusted to 00CPS / 20 ° C was prepared.
At this time, the application amount of the mixed adjustment liquid was 400 g / m ^2.
And

Then, the mixed and adjusted liquid was applied to the surface of the same formwork as in Example 1 and air-dried, and the mixed and dispersed solution was applied to the surface and air-dried. Formwork was obtained. At this time, the coating amount of the mixed dispersion solution was 200 g / m ² .

[0049]

Example 11 A mold of the present invention was obtained in the same manner as in Example 10, except that the adhesive in Example 10 was changed to a polyvinyl alcohol adhesive.

[0050]

Example 12 A mold of the present invention was obtained in the same manner as in Example 10, except that the adhesive in Example 10 was changed to a methylcellulose adhesive.

[0051]

Example 13 A mold of the present invention was obtained in the same manner as in Example 10, except that the pressure-sensitive adhesive of Example 10 was changed to a two-component acrylic pressure-sensitive adhesive.

[0052]

Embodiment 14 The application amount of the mixture adjusting solution of Embodiment 10 was set to 50
A mold of the present invention was obtained in the same manner as in Example 10 except that the amount was changed to 0 g / m ² .

Using the molds of Examples 1 to 14, concrete materials were cast, cured and cured to produce concrete products whose surfaces were protected. On the other hand, as a comparative example,
Using a conventionally known mold, a concrete product in which a silicate compound was not embedded in the surface was manufactured.

For each of the concrete products thus obtained, a protective performance test was carried out by applying water to the surface and visually observing how the water adhering to the surface penetrated into the concrete (in the concrete). If water penetrates into the surface, the surface turns blackish, so it can be determined at a glance.) As a result, in the concrete products manufactured using the molds of Examples 1 to 14, the applied water did not permeate due to water repellency. On the other hand, in the concrete product of the comparative example, the water permeated and the portion to which the water adhered was colored blackish.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a mold of the present invention.

FIG. 2 is an explanatory view showing a method for producing a concrete product using the formwork.

FIG. 3 is an explanatory view showing the above manufacturing method.

FIG. 4 is an explanatory view showing the operation of the mold.

FIG. 5 is a sectional view showing a second embodiment of the present invention.

FIG. 6 is a sectional view showing a third embodiment of the present invention.

FIG. 7 is a sectional view showing a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Formwork 2 Adhesive layer 3 Silicate compound 4 Formwork surface

Claims (7)

[Claims] 1. A formwork which is used when a concrete material is cast by setting the surface of the formwork to a contact surface with the concrete material, wherein the adhesive force on the contact surface is reduced by moisture in the concrete material or the like. A concrete casting formwork, wherein the following powder or fine particles (A) are distributed via an adhesive. (A) A silicate compound which crystallizes by reacting with an alkali component in a concrete material. 2. A sheet in which the powder or fine particles of the above (A) is distributed via an adhesive whose adhesive force is reduced by moisture or the like in the concrete material, and the sheet is provided on the surface of a mold frame. 2. The concrete casting formwork according to claim 1, wherein the sheet surface is a contact surface with a concrete material by being detachably attached with the body or fine grain distribution surface outside. 3. The pressure-sensitive adhesive layer is formed on a surface in contact with a concrete material, and the powder or fine particles of (A) is distributed and attached to the surface of the pressure-sensitive adhesive layer. Concrete casting formwork. 4. A concrete casting method according to claim 1, wherein a layer of a mixture in which the powder or the fine particles of (A) is previously mixed with the adhesive is formed on a contact surface with the concrete material. Formwork. 5. The mixed agent layer is formed on a contact surface with a concrete material, and the powder or fine particles of (A) is distributed and attached to the surface of the mixed agent layer.
The described concrete casting formwork. 6. The concrete casting formwork according to claim 1, wherein an uneven pattern is formed on a contact surface with the concrete material. 7. The following (A) is applied to the surface of a mold via an adhesive whose adhesive strength is reduced by moisture or the like in a concrete material.
Prepare a mold in which powder or fine particles are distributed, cast a concrete material with the mold surface of this mold as a contact surface, and use the moisture and the like in the concrete material to reduce the adhesive force of the adhesive. The powder or fine particles of the above (A) are transferred to and buried in the concrete surface while being reduced, and the powder or fine particles of the above (A) buried in the concrete surface are reacted with an alkali component or the like in the concrete material. A method for producing a concrete product characterized by being crystallized. (A) A silicate compound which crystallizes by reacting with an alkali component in a concrete material.