JP2000043013A - Sheet for washing out concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet for washing out concrete which can form a uniform washing-out pattern simply when washing-out is applied on the surface of the concrete. SOLUTION: A concrete washing-out sheet 1 comprises a sheet body 2 and a concrete curing retarding agent layer 3, and through holes 4 penetrating the sheet itself are formed and distributed. Preferably, the diameter of the through hole 4 is 0.05-10 mm, the distance between adjacent through holes 4 is 1-30 mm, and the thickness of the layer 3 is 0.03-0.5 mm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete washing sheet for forming a washing pattern by washing a concrete surface.

[0002]

2. Description of the Related Art Conventionally, the following method has been used to form a washed-out pattern by washing out the upper surface of concrete cast in a formwork to express makeup. That is, first, concrete is poured into a mold, and then a concrete hardening retardant is applied to the upper surface of the concrete to be washed out. Then, after the concrete has cured and hardened, the uncured portion of the upper surface due to the penetration of the concrete hardening retardant is washed out with water. In this way,
A wash pattern is formed.

As another method, as shown in FIG. 3, a method using a concrete washing sheet 50 has been performed. That is, the sheet-like film 5 is
A concrete washing sheet 50 having a concrete hardening retardant layer 3 having a constant thickness formed on the surface of 1 is prepared. Then, after the concrete 5 is poured into the mold 6, the concrete washing sheet 50 is covered so that the concrete hardening retardant layer 3 is brought into contact with the upper surface 5 a of the concrete 5 to be washed. Next, after the concrete 5 is cured and hardened, the concrete washing sheet 50 is peeled off. Finally, the upper surface 5a of the concrete 5
The uncured portion due to the penetration of the concrete curing retarder is washed out with water. In this way, a wash-out pattern is formed.

[0004]

However, in the method for applying the concrete hardening retardant, the upper surface 5a of the concrete 5 cast on the formwork 6 is not completely horizontal but also uneven. For this reason, even if the concrete hardening retardant is applied, the applied thickness (amount of application) is not uniform on the upper surface 5a of the concrete 5. As a result, even if the washing is performed, there are portions where the washing amount is large and portions where the washing amount is small, so that the washing surface is not uniform and the washing pattern is not uniform. Also, if rain or the like falls after the concrete hardening retardant is applied and before the concrete hardens, the concrete hardening delaying agent is washed away by rainwater or the like, and the designed washing pattern cannot be exhibited. On the other hand, in the method using the concrete washing sheet 50, when the concrete washing sheet 50 is covered, the upper surface 5a of the concrete 5 and the concrete washing sheet 50 are placed.
A large number of portions where air and water are accumulated are distributed.
In such a portion, the upper surface 5a of the concrete 5 does not come into contact with the concrete hardening retardant layer 3, and the concrete 5
Does not delay curing. For this reason, even if it is washed out,
The washing-out performance of the concrete washing sheet 50 is not exhibited due to the formation of a large washing portion and a small washing portion, and the washing pattern is not uniform. Therefore, when the pressure and the accumulated air and water are expelled and the upper surface 5a of the concrete 5 and the concrete hardening retardant layer 3 are brought into contact with each other, the concrete 5 is deformed or flows due to the pressure. As a result, the concrete shape cannot be developed.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a concrete washing sheet which can easily form a uniform washing pattern when the concrete surface is washed. .

[0006]

In order to achieve the above-mentioned object, a concrete washing sheet of the present invention has a concrete hardening retarder layer which is brought into contact with a cast concrete surface and has a hardening delay. The sheet for use has a concrete hardening retardant layer on the surface, and a plurality of through-holes penetrating the front and back of the sheet are formed in the concrete hardening retardant layer.

That is, the concrete washing sheet of the present invention has a concrete hardening retardant layer on its surface,
In this concrete hardening retardant layer, a plurality of through holes penetrating through the front and back of the sheet are formed in a distributed manner, so even if the concrete hardening retardant layer is put on the concrete surface on which it is cast, it is covered with the concrete hardening retardant layer. The air and water between the concrete surface and the concrete washing sheet and the sand and cement particles of the concrete are expelled from the through holes, and the entire surface of the concrete hardening retardant layer is easily and reliably removed from the concrete surface in a short time. Comes into contact with Therefore, the washing performance of the concrete washing sheet is exhibited, and the washing pattern becomes uniform when washing is performed.

Further, in the concrete washing sheet of the present invention, the diameter of the through hole is 0.05 to 10 mm,
When the distance between the adjacent through holes is in the range of 1 to 30 mm, the contact between the concrete surface and the concrete hardening retardant layer, and the penetration of air or water between the concrete surface and the concrete washing sheet, Ejection from the hole is preferably performed.

Further, in the concrete washing sheet of the present invention, the concrete hardening retardant layer has a thickness of 0.
When it is in the range of 03 to 0.5 mm, the penetration of the concrete hardening retardant and the expulsion of air, water and the like from the through holes are suitably performed.

[0010] In the concrete washing sheet of the present invention, when the back surface of the sheet is subjected to a non-water absorbing treatment, the concrete hardening retardant layer is brought into contact with the concrete surface on which the concrete washing sheet is cast. Even if it rains after being covered, the concrete hardening retardant is not washed away by rainwater or the like, and a designed washout pattern can be exhibited.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIGS. 1 and 2 show an embodiment of a concrete washing sheet according to the present invention. In this embodiment, the concrete washing sheet 1 is in the form of a strip having a width of 900 mm, and includes a sheet body 2 and a concrete hardening retardant layer 3 formed on the surface of the sheet body 2. A plurality of through-holes 4 penetrating through are formed, and are bendable.

The sheet member 2 is made of a polyester resin, and is a belt-shaped member having a width of 900 mm.

The concrete hardening retardant layer 3 is formed by applying a concrete hardening retardant to the entire surface of the sheet 2 and then drying and hardening the same.
It is constant in the range of 03 to 0.5 mm.

The through hole 4 has a diameter of 0.05 to 10 m.
m, the distance between adjacent through-holes 4 is in the range of 1 to 30 mm, and the distribution is irregular.

Such a concrete washing sheet 1 is used for forming a washing pattern on the concrete surface in the same manner as in the prior art. That is, first,
The strip-shaped concrete washing sheet 1 is cut into an appropriate length and shape. Next, after the concrete 5 is poured into the formwork 6, the upper surface 5 a of the concrete 5 to be washed out
The concrete washing sheet 1 is covered so that the concrete hardening retardant layer 3 is brought into contact with the (surface). Next, after the concrete 5 has cured and hardened, the concrete washing sheet 1 is peeled off. Finally, the uncured portion of the upper surface 5a of the concrete 5 with the concrete curing retarder is washed out with water. In this way, a wash-out pattern can be formed on the upper surface 5a of the concrete 5 cast on the formwork 6.

When the concrete washing sheet 1 is used as described above, the concrete washing sheet 1 has a plurality of through-holes 4 penetrating through the front and back surfaces of the concrete washing sheet 1, so that the upper surface 5a of the concrete 5 is formed. The air and water between the concrete washing sheet 1 and the sand and cement particles of the concrete 5 are expelled from the through holes 4, and the entire surface of the concrete hardening retardant layer 3 is easily and quickly placed on the upper surface 5 a of the concrete 5. , And come into contact reliably. For this reason, the washing performance of the concrete washing sheet 1 is exhibited, and when washing is performed, the washing pattern becomes uniform. Moreover, since the thickness of the concrete hardening retardant layer 3 is constant, the washing surface is uniform.

Further, the diameter of the through hole 4 is 0.05-10.
mm, and the distance between adjacent through holes 4 is in the range of 1 to 30 mm, so that the contact between the upper surface 5a of the concrete 5 and the concrete hardening retardant layer 3 and the contact between the upper surface 5a of the concrete 5 and the sheet 1 for concrete washing are performed. The displacement of air, water, and the like from the through-hole 4 is preferably performed.
The case where this ejection is more suitable is a case where the diameter of the through hole 4 is 2 mm and the distance between the adjacent through holes 4 is 10 mm. If the diameter of the through hole 4 is smaller than 0.05 mm, sand or cement in the concrete 5 is likely to be clogged in the through hole 4, and it is difficult for air and water to be expelled.
For this reason, the expelling work is troublesome, and when the concrete 5 cures and hardens as it is, even if the washing is performed, the washing pattern may not be uniform. Conversely, if the diameter of the through hole 4 is larger than 10 mm, the concrete hardening retardant layer 3 does not exist in the portion of the through hole 4,
A portion where the concrete hardening retardant does not penetrate into the upper surface 5a of the concrete 5 is easily formed, and even if it is washed out,
The washing pattern may not be uniform. When the distance between the adjacent through holes 4 is smaller than 1 mm, the area occupied by the through holes 4 on the surface of the concrete washing sheet 1 becomes too large, and the amount of the concrete hardening retarder tends to be insufficient. Washing may not be sufficient. Conversely, the distance between adjacent through holes 4 is 30 mm
If it is larger than this, the number of the through holes 4 becomes too small and tends to be insufficient to expel air, water, and the like.
When curing is performed, the washed out pattern may not be uniform even after being washed out.

Further, since the thickness of the concrete hardening retardant layer 3 is in the range of 0.03 to 0.5 mm, the concrete hardening retardant is preferably permeated and driven out of the through holes 4 such as air and water. . If the thickness of the concrete hardening retardant layer 3 is smaller than 0.03 mm, the amount of the concrete hardening retardant tends to be too small and the penetration thereof becomes insufficient. For this reason, washing may not be performed sufficiently. Conversely, if the thickness of the concrete hardening retardant layer 3 is larger than 0.5 mm, the shape of the through-hole 4 may be crushed and may be easily closed, and it may be impossible to sufficiently expel air or water.

Further, since the material of the sheet body 2 is a non-hydrophilic polyester resin, the concrete washing sheet 1 is placed on the upper surface 5a of the concrete 5 cast on the formwork 6.
Even if it rains after covering, the concrete hardening retardant is not washed away by rainwater or the like. Furthermore, since the contact surface between the concrete washing sheet 1 and the concrete 5 is uncured, when the concrete washing sheet 1 is peeled off, a large force is not applied to itself. For this reason, the sheet body 2 is not damaged even by a thin film or the like.

As a modified example of the sheet member 2, there is a sheet member made of paper. When the material is paper, the disposal process is simplified. Further, this may be used as it is, as in the above embodiment, but it is preferable to apply oil, resin, or the like to the back surface and perform a non-water absorbing treatment. As described above, when the back surface of the sheet body 2 is subjected to the non-water-absorbing treatment, the concrete hardening retardant is not washed away by rainwater or the like even when rain falls.

Next, examples will be described together with comparative examples and comparative examples.

[0023]

Examples 1 to 3 and Comparative Examples 1 and 2 The width is 900 m
m, a concrete setting retarder composed of lignin sulfonic acid is applied to the surface of a polyester resin sheet 2 having a belt-like shape of m, and then dried and cured to form a concrete setting retarder layer 3. The concrete washing sheet 1 was produced by forming a plurality of through holes 4 penetrating therethrough. At this time, those having different thickness of the concrete hardening retardant layer 3, diameter of the through hole 4 and distance between the adjacent through holes 4 were produced, and the results are shown in Table 1 below.

[0024]

COMPARATIVE EXAMPLE 1 A concrete washing sheet comprising a sheet 2 and a concrete retarder layer 3 similar to those of the above-mentioned example and having no through holes 4 formed therein was prepared. That is, this is the same as the conventional example.

[0025]

[Table 1]

Using the concrete washing sheet 1 of the example product, the comparative example product and the comparative example product thus obtained, the upper surface 5 of the concrete 5 cast into the form 6
a was washed out to form a washed-out pattern. Then, the workability and the state of the washed-out pattern were comparatively evaluated according to the following criteria. The results are shown in Table 1 above.

[Workability] After the concrete washing sheet 1 is put on the upper surface 5a of the concrete 5 cast on the formwork 6, the air or water is easily driven out. Are indicated by ○, and those that are difficult to remove are indicated by △.

[State of Washed-out Pattern] ◎ indicates that the washed-out pattern is clean and uniform, ○ indicates that the pattern is not cleanly uniform but has no problem in appearance, and Δ indicates that it is not uniform. displayed.

From the results shown in Table 1, it can be seen that when the concrete washing sheet 1 of the example was used, the workability and the state of the washing pattern were excellent.

In the above embodiment, the concrete washing sheet 1 and the sheet body 2 have a width of 900 mm.
However, the size and shape are not limited thereto, and may be other sizes and shapes.

In the above embodiment, the sheet 2 is made of polyester resin. However, any other material may be used as long as it is non-hydrophilic, such as acrylic resin or vinyl chloride.

On the other hand, when the material of the sheet 2 is paper, oil or resin is applied to the back surface of the sheet 2 as a non-water-absorbing treatment, but the invention is not limited to this. Examples of the non-water-absorbing treatment include release agents obtained by mixing silicon resin, polyvinyl alcohol, vinyl acetate resin, starch urea resin, melamine resin, glyoxal, ketone aldehyde, etc., petroleum wax emulsion, aqueous solution of fatty acid derivative, emulsion Application of synthetic resin, chromate, etc., polyethylene resin, polypropylene resin,
Lamination of films such as polystyrene resin and aluminum foil, latex such as SBR, NBR, NR, polyacrylate, polyvinyl acetate resin, polyurethane, petroleum wax such as paraffin wax and microcrystalline wax, phenol resin, melamine resin, Examples include impregnation with a resin material such as a polyester resin, a zinc chloride solution or the like, vapor deposition of various metal materials and nonmetal materials, and printing of the above resin material.

In the above-described embodiment, the concrete hardening retardant is not particularly limited as long as it can harden the concrete 5. For example, a UV-curable resin, a substance that is hydrolyzed by an alkali, a substance that adsorbs calcium ions, and the like can be used. Examples are shown below, but they can be used alone or in combination.

Examples of the UV-curable resin include, for example,
Acrylates such as 1.6-hexanediol diacrylate, neopentyl glycol diacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate, pentaerythritol tetramethacrylate, α, α-tetraacryl-bistrimethylolpropane tetrahydrophthalate, α, α Compounds obtained by reacting 2-hydroxyethyl acrylate (HEA) with phthalates such as -dimethacryl-bisdiethylene glycol phthalate, tolylene diisocyanate, isophorone diisocyanate, etc .; compounds obtained by reacting HEA with hexanediol and isophorone diisocyanate; bisphenol A -Diglycidyl ether diacrylate, trimethylolpropane polyglycidyl ether polyacrylate, Pyro glycol diglycidyl ether diacrylate, silicone acrylate, triacryloyl oxyethyl isocyanurate and the like.

Examples of the substance which inhibits the hardening of the concrete 5 by being hydrolyzed by an alkali include esters such as polyvinyl acetate and hemicellulose.
Examples of the substance that suppresses the hardening of the concrete 5 by adsorbing calcium ions include potassium and sodium salts, phenols, cellulose, and lignin, which have a higher ionization tendency than calcium.

In addition to the above, as a substance which suppresses the hardening of the concrete 5, resin materials such as unsaturated polyester resin, vinyl ester resin such as epoxy (meth) acrylate, resin having a phosphonic acid group, maleic ester urethane prepolymer, etc. In addition, various organic and inorganic substances are used. Examples of the organic substances include glucoheptonic acid, gluconic acid, galactonic acid, mucous acid, citric acid, arabic acid, erythronic acid, tartaric acid, malic acid, threonine (amino acid), succinic acid, maleic acid, glyceric acid, glycolic acid, and oxalic acid. Oxycarboxylic acid and dicarboxylic acid such as lactic acid, and salts thereof, ketocarboxylic acid such as 2-ketogluconic acid and pyruvic acid, caproic acid, valeric acid, butyric acid,
Fatty acids such as propionic acid and acetic acid, sugar alcohols such as perseitol, sorbitol, arabitol, erythritol, glycerol and ethylene glycol, glucoheptose, glucose, mannose, galactose, fructose, arabinose, erythrose, glyceraldehyde and saccharose (sucrose) , Lactose, maltose, raffinose, dextrin, etc., ligninsulfonic acid, aminodi (methylenephosphonic acid), aminotri (methylenephosphonic acid), 1-hydroxyethylidene-1,1-diphosphonic acid, ethylenediaminetetra (methylenephosphonic acid), Phosphonic acid-based curing retarders such as diethylenetriaminepenta (methylenephosphonic acid), hexamethylenediaminetetra (methylenephosphonic acid) or salts thereof Saturated polycarboxylic acids such as oxalic acid and malonic acid; unsaturated polycarboxylic acids such as fumaric acid and itaconic acid; polycarboxylic acids such as glucoheptanonic acid or salts thereof; polymaleic acid, polyfumaric acid, styrene-maleic Acid copolymer, polyacrylic acid, polymethacrylic acid,
Monomers or copolymers of monomers having a carboxyl group such as styrene- (meth) acrylic acid copolymer, (meth) acrylic acid ester- (meth) acrylic acid copolymer, ethylenesulfonic acid-acrylic acid copolymer, or their copolymers Salts, antioxidants such as ascorbic acid and isoascorbic acid, polymers such as polyhydroxysilane and polyacrylamide, humic acid, lignosulfonates, celtic carboxylic acids, water-soluble starch, rye powder, gum arabic and alcohols. Can be Examples of the inorganic substance include magnesium fluorosilicate, sodium tripolyphosphate, zinc oxide, boron compounds, borates, phosphates (particularly sodium hexametaphosphate), and hexafluorosilicates.

In the above embodiment, the distribution of the through holes 4 is irregular, but they may be distributed regularly. Furthermore, only the same diameter of the through holes 4 may be distributed, or different diameters of the through holes 4 may be distributed.

Although the concrete hardening retardant layer 3 is formed on the entire surface of the sheet 2 in the above embodiment, it may be formed on a part of the surface of the sheet 2. Further, a concrete hardening retardant layer 3 is formed on the surface of the sheet 2.
May form a pattern such as a character or a graphic. By doing so, it is possible to easily select a location where the wash-out pattern appears and a location where the wash-out pattern does not occur and develop the wash-out pattern. Further, patterns such as characters and figures can be developed at the same time as washing out. Further, in the above embodiment, the thickness of the concrete hardening retardant layer 3 was constant, but the sheet 2
It may be made different depending on the surface portion. By doing so, it is possible to easily select and develop a place where the amount of washing is large and a place where the amount of washing is small, and it is possible to develop a washing surface with a lot of undulations.

[0039]

As described above, the concrete washing sheet of the present invention has a concrete hardening retardant layer on the surface, and a plurality of through holes penetrating through the front and back of the sheet are distributed in the concrete hardening retardant layer. Because it is formed, air and water between the concrete surface and the sheet for washing out concrete, as well as sand grains and cement of concrete, even if the concrete setting delay layer is brought into contact with the cast concrete surface. The particles and the like are expelled from the through holes, and the entire surface of the concrete hardening retardant layer comes into contact with the concrete surface in a short time, easily and reliably. Therefore, the washing performance of the concrete washing sheet is exhibited, and the washing pattern becomes uniform when washing is performed.

In the concrete washing sheet of the present invention, when the diameter of the through hole is in the range of 0.05 to 10 mm and the distance between the adjacent through holes is in the range of 1 to 30 mm, the concrete surface and the concrete hardening delay are reduced. The contact with the agent layer and the displacement of the air and water between the concrete surface and the concrete washing sheet from the through holes are preferably performed.

In the concrete washing sheet of the present invention, the concrete hardening retardant layer has a thickness of 0.
When it is in the range of 03 to 0.5 mm, the penetration of the concrete hardening retardant and the expulsion of air, water and the like from the through holes are suitably performed.

Further, in the concrete washing sheet of the present invention, when the back surface of the sheet is subjected to a non-water absorbing treatment, the concrete hardening retardant layer is brought into contact with the concrete surface on which the concrete washing sheet is cast. Even if it rains after being covered, the concrete hardening retardant is not washed away by rainwater or the like, and a designed washout pattern can be exhibited.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a use state of a concrete washing sheet according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the concrete washing sheet.

FIG. 3 is an explanatory view showing a state of use of a conventional concrete washing sheet.

[Explanation of symbols]

 Reference Signs List 1 sheet for concrete washing 2 sheet body 3 concrete hardening retardant layer 4 through hole

Claims (4)

[Claims] 1. A concrete washing sheet for delaying hardening by bringing its own concrete hardening retarder layer into contact with a cast concrete surface, comprising a concrete hardening retarder layer on the surface. A concrete washing sheet characterized in that a plurality of through holes penetrating through the front and back of the sheet are formed in the agent layer in a distributed manner. 2. The concrete washing sheet according to claim 1, wherein the diameter of the through hole is 0.05 to 10 mm, and the distance between adjacent through holes is 1 to 30 mm. 3. The concrete hardening retardant layer having a thickness of 0.
The sheet for washing concrete according to claim 1, wherein the sheet has a thickness of 03 to 0.5 mm. 4. The sheet for washing concrete according to claim 1, wherein the back surface of the sheet is subjected to a non-water absorbing treatment.