JP2010235435A - Wall face forming method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wall face forming method which can prevent from being contaminated due to time of a waterproofing agent when further constructing concrete to a wall face forming base, which is excellent in workability and further which is excellent in adhesiveness of a waterproofing layer with a cured material of a hydraulic composition. <P>SOLUTION: The wall face forming method comprises laminating the waterproofing layer on a surface of the base comprising the cured material of the hydraulic composition, then laminating a polyvinyl alcohol-based film outside thereof, and further applying and curing the hydraulic composition, when forming the wall face made by curing the hydraulic composition. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a wall surface forming method in which a hydraulic composition is applied to a wall surface forming base and cured to form a wall surface.

  Generally, when forming a wall surface, when concrete is constructed, the concrete is poured into a mold or a frame and hardened. However, this causes a problem that a fine gap occurs due to hardening shrinkage or the like when the concrete is hardened, and when the concrete is introduced and constructed, such a gap leads to water intrusion. As a result, there are problems such as reduced workability and cracks in the hardened concrete.

Therefore, waterproofing agents have come to be used for the purpose of preventing the intrusion of water as described above during concrete construction. For example, once the waterproofing agent has been applied to the concrete construction wall, the concrete is introduced. The method of hardening is taken. In this case, the waterproofing agent serves to prevent water from entering. As such a waterproofing agent, generally, a waterproofing agent using an organic material such as asphalt, rubber or resin (for example, urethane resin, epoxy resin, etc.) or an inorganic material is used. There was a waterproofing agent.
Moreover, as said waterproofing method, the water-stopping method etc. which used the water-stopping material containing bentonite and the elastomer containing a water absorbing resin, etc. are also proposed (for example, refer patent document 1).

JP 2001-32694 A

  However, as in the above technique, simply applying a waterproofing agent is not sufficient in terms of stability over time, such as the waterproofing agent being contaminated or altered before the concrete is charged or applied. It was sufficient, and there was still room for improvement in terms of workability during construction. Further improvement is also desired in terms of adhesion between the waterproofing agent and a cured product of a hydraulic composition such as concrete.

  Therefore, in the present invention, under such a background, when further concrete construction is performed on the wall surface forming base, the waterproofing agent can be prevented from being contaminated over time, the workability is excellent, and the waterproof layer and the hydraulic composition are further improved. The object of the present invention is to provide a method for forming a wall surface that is also excellent in adhesion to the cured product.

  However, as a result of intensive studies in view of such circumstances, the present inventor has formed a waterproof layer and a polyvinyl alcohol film in the intermediate layer of the wall surface in forming the wall surface obtained by curing the hydraulic composition. The present inventors have found that the waterproofing agent can be prevented from being contaminated with the passage of time and has excellent workability.

  That is, the gist of the present invention is to form a wall surface formed by curing a hydraulic composition, after laminating a waterproof layer on the surface of a base made of a cured product of the hydraulic composition, and then forming a polyvinyl alcohol system on the outside thereof. The present invention relates to a wall surface forming method in which a film is laminated and a hydraulic composition is further applied and cured.

  According to the wall surface forming method of the present invention, the polyvinyl alcohol film can protect the waterproof layer, so that the waterproofing agent can be prevented from being contaminated over time. Further, since the polyvinyl alcohol film is a water-absorbing film, it is waterproof. An effect can be improved further and it has the effect excellent in construction workability | operativity. Furthermore, it also has an effect of improving the adhesion between the waterproof layer and the cured product of the hydraulic composition.

  The present invention is described in detail below.

  The waterproof layer formed by the wall surface forming method of the present invention is conventionally waterproofed such as a concrete joint part in civil engineering or a building structure, a joint part in construction of concrete and other members, or a joint part of a concrete primary product. A layer formed from a conventionally known waterproofing agent used in a place may be used, and for example, an organic material such as asphalt, rubber, resin (for example, urethane resin, epoxy resin, etc.) is used. Waterproofing agents and waterproofing agents using inorganic materials can be mentioned. Of these, asphalt waterproofing agents are preferred.

  Furthermore, in the present invention, among the above waterproofing agents, in particular, as described in JP-A-2006-131864, 10-15 parts by weight of asphalt, 20-50 parts by weight of oil, 8-12 parts by weight of filler. Parts, thickener 1-3.5 parts by weight, surfactant 0.1-0.5 parts by weight at 150 ° C.-180 ° C., then waste tire melt 25-40 parts by weight, sulfur 0.5 -1 part by weight, vulcanization accelerator 0.05-1 part by weight, anti-aging agent 0.1-0.4 part by weight, 10-20 parts by weight bentonite, 1-5 parts by weight water-soluble polymer resin It is preferable to use an asphalt type waterproofing agent obtained by mixing the above in view of excellent waterproof effect and excellent followability to the wall-forming base.

The polyvinyl alcohol film used in the present invention is a film formed by forming a polyvinyl alcohol resin solution.
Such a polyvinyl alcohol resin can be produced by a conventionally known method. For example, it can be obtained by saponifying polyvinyl acetate obtained by polymerizing vinyl acetate.

  In the present invention, other monomers can be copolymerized within a range that does not impair the object of the present invention, for example, 10 mol% or less, preferably 1 to 7 mol%. For example, olefins such as ethylene, propylene, isobutylene, α-octene, α-dodecene, α-octadecene, unsaturated acids such as acrylic acid, methacrylic acid, crotonic acid, maleic acid, maleic anhydride, itaconic acid, or salts thereof Mono or dialkyl esters, nitriles such as acrylonitrile and methacrylonitrile, amides such as acrylamide and methacrylamide, olefin sulfonic acids such as ethylene sulfonic acid, allyl sulfonic acid and methallyl sulfonic acid or salts thereof, alkyl vinyl ethers, N -Acrylamide methyltrimethyla Polyoxygen such as monium chloride, allyltrimethylammonium chloride, dimethyldiallylammonium chloride, dimethylallyl vinyl ketone, N-vinyl pyrrolidone, vinyl chloride, vinylidene chloride, polyoxyethylene (meth) allyl ether, polyoxypropylene (meth) allyl ether Polyoxyalkylene (meth) acrylates such as alkylene (meth) allyl ether, polyoxyethylene (meth) acrylate, polyoxypropylene (meth) acrylate, polyoxyethylene (meth) acrylamide, polyoxypropylene (meth) acrylamide and other poly Oxyalkylene (meth) acrylamide, polyoxyethylene (1- (meth) acrylamide-1,1-dimethylpropyl) ester, polyoxyethylene Down vinyl ether, polyoxypropylene vinyl ether, polyoxyethylene allylamine, polyoxypropylene allylamine, polyoxyethylene vinylamine, polyoxypropylene vinylamine, diacrylic acetone amides.

Further, N-acrylamidomethyltrimethylammonium chloride, N-acrylamidoethyltrimethylammonium chloride, N-acrylamidopropyltrimethylammonium chloride, 2-acryloxyethyltrimethylammonium chloride, 2-methacryloxyethyltrimethylammonium chloride, 2-hydroxy-3- Examples also include cation group-containing monomers such as methacryloyloxypropyltrimethylammonium chloride, allyltrimethylammonium chloride, methallyltrimethylammonium chloride, 3-butenetrimethylammonium chloride, dimethyldiallylammonium chloride, and diethyldiallylammonium chloride.
Also, polyvinyl alcohol resins containing acetoacetyl groups can be used.

  Moreover, it is also preferable to use a polyvinyl alcohol resin having a 1,2-diol bond in the side chain as the polyvinyl alcohol resin, and the polyvinyl alcohol resin having a 1,2-diol bond in the side chain is, for example, ( A) a method of saponifying a copolymer of vinyl acetate and 3,4-diacetoxy-1-butene, (a) a method of saponifying and decarboxylating a copolymer of vinyl acetate and vinyl ethylene carbonate, A method of saponifying and deketalizing a copolymer of vinyl acetate and 2,2-dialkyl-4-vinyl-1,3-dioxolane, and (d) a copolymer of vinyl acetate and glycerol monoallyl ether. It is obtained by a saponification method or the like.

  The average saponification degree of the polyvinyl alcohol resin used in the present invention is usually 70 mol% or more, preferably 70 to 98 mol%, more preferably 75 to 97 mol%, particularly preferably 80. -96 mol%. When the average degree of saponification is out of the above range, the film is insufficiently dissolved in the interior when the hydraulic composition is overcoated after laminating the polyvinyl alcohol film on the wall surface forming base, and the overcoated wall surface collapses. There is a tendency for fear.

  The viscosity of a 4% by weight aqueous solution of the polyvinyl alcohol resin at 20 ° C. is usually preferably 10 to 70 mPa · s, more preferably 10 to 65 mPa · s, and particularly preferably 15 to 60 mPa · s. If the viscosity of this 4% by weight aqueous solution is too low, the film will disappear and the laminating operation on the wall surface will be hindered, and the film will tend to crack during the pasting operation. If it is too high, the polyvinyl alcohol film will be used as the wall forming base. When the hydraulic composition is repeatedly applied after lamination, the film is not sufficiently dissolved inside, and the wall surface that has been overcoated tends to collapse.

The average saponification degree is measured according to JIS K 6726 3.5, and the viscosity is measured according to JIS K 6726 3.1.2.
In the present invention, not only one kind of the polyvinyl alcohol resin but also two or more kinds can be used in combination.

  The polyvinyl alcohol-based resin is used to form a polyvinyl alcohol-based film, but it is preferable to further include a plasticizer or a surfactant, and if necessary, a filler or starch is further added. You may make it contain.

  Examples of the plasticizer used in the present invention include glycerins such as glycerin, diglycerin, and triglycerin, alkylene glycols such as triethylene glycol, polyethylene glycol, polypropylene glycol, and dipropylin glycol, and trimethylolpropane. . These may be used alone or in combination of two or more.

  The content of the plasticizer is preferably 5 to 45 parts by weight, particularly 7 to 40 parts by weight, and more preferably 10 to 35 parts by weight with respect to 100 parts by weight of the polyvinyl alcohol resin. . If the content is too small, the plastic effect tends to be low, and if it is too large, the plasticizer tends to bleed from the surface over time.

  Examples of the surfactant used in the present invention include polyoxyethylene nonyl phenyl ether, polyoxyethylene octyl nonyl ether, polyoxyethylene dodecyl phenyl ether, polyoxyethylene alkyl allyl ether, polyoxyethylene sorbitan monolaurate, polyoxyethylene Oxyethylene sorbitan monopalmitate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan monooleate, polyoxyalkylene alkyl ether phosphate monoethanolamine salt, polyoxyethylene lauryl amino ether, polyoxyethylene stearyl amino ether, etc. Of polyoxyethylene alkylamino ethers, and the like, are used alone or in combination of two or more. Of these, polyoxyalkylene alkyl ether phosphate monoethanolamine salts and polyoxyethylene alkylamino ethers are preferable in terms of peelability.

  About content of this surfactant, it is preferable that it is 0.01-5 weight part with respect to 100 weight part of polyvinyl alcohol-type resin, Especially 0.03-3 weight part, Furthermore, 0.05-2. It is preferable that it is a weight part. If the content is too small, the peelability between the metal surface of the film forming apparatus such as a drum or belt and the film formed tends to be difficult to produce, and if it is too large, the film surface bleeds and blocks. It tends to cause the handling property to deteriorate.

Examples of the filler used in the present invention include inorganic fillers and organic fillers.
As an inorganic filler, it is preferable that the average particle diameter is 1-10 micrometers, and when this average particle diameter is too small, there exists a tendency for the blocking inhibitory effect of a film to decrease, and when too large, the external appearance of a film will worsen. Product value tends to decrease. Specific examples include, for example, talc, clay, silicon dioxide, diatomaceous earth, kaolin, mica, asbestos, gypsum, graphite, glass balloon, glass beads, calcium sulfate, barium sulfate, ammonium sulfate, calcium sulfite, calcium carbonate, whisker-like Calcium carbonate, magnesium carbonate, dosonite, dolomite, potassium titanate, carbon black, glass fiber, alumina fiber, boron fiber, processed mineral fiber, carbon fiber, carbon hollow sphere, bentonite, montmorillonite, copper powder, sodium sulfate, potassium sulfate, Zinc sulfate, copper sulfate, iron sulfate, magnesium sulfate, aluminum sulfate, potassium aluminum sulfate, ammonium nitrate, sodium nitrate, potassium nitrate, aluminum nitrate, ammonium chloride, sodium chloride, chloride Potassium, magnesium chloride, calcium chloride, sodium phosphate, potassium chromate, calcium citrate.

  The content of the inorganic filler is preferably 0.1 to 50 parts by weight, particularly preferably 0.5 to 10 parts by weight with respect to 100 parts by weight of the polyvinyl alcohol resin. If the content is too small, the blocking inhibitory effect tends to decrease, and if it is too large, the tensile elongation of the film tends to decrease.

  Moreover, as an organic filler, it is preferable that the average particle diameter is 0.5-10 micrometers, More preferably, it is 0.5-7 micrometers, Most preferably, it is 0.5-5 micrometers, More preferably, it is 0.5- 3 μm. If the average particle size is too small, the cost tends to increase, and if too large, the dispersibility tends to decrease.

  Specific examples of such organic fillers include, for example, starch, melamine resin, polymethyl (meth) acrylate resin, polystyrene resin, and biodegradable resins such as polylactic acid and rice starch. Polymethyl (meth) acrylate resins, polystyrene resins, and biodegradable resins are preferably used.

  The content of the organic filler is preferably 5 to 25 parts by weight with respect to 100 parts by weight of the polyvinyl alcohol resin, and particularly preferably 5 to 15 parts by weight. When the content is too small, the film tends to block, and when the content is too large, the flexibility of the film tends not to be obtained.

  The starch is contained for the purpose of preventing blocking and adjusting the mechanical strength, and preferably has an average particle size of 10 μm or more. Specific examples include raw starch (corn starch, potato starch, sweet potato starch). , Wheat starch, kissava starch, sago starch, tapioca starch, sorghum starch, rice starch, bean starch, kudzu starch, bracken starch, lotus starch, castor starch, etc.); physically modified starch (α-starch, fractionated amylose, wet heat treatment) Starch, etc.); enzyme-modified starch (hydrolyzed dextrin, enzyme-degraded dextrin, amylose, etc.); chemical degradation-modified starch (acid-treated starch, hypochlorite oxidized starch, dialdehyde starch, etc.); chemically-modified starch derivative (esterified starch) , Etherified starch, cationized starch, cross-linked starch, etc.). Among the chemically modified starch derivatives, esterified starch includes acetate esterified starch, succinate esterified starch, nitrate esterified starch, phosphate esterified starch, urea phosphate esterified starch, xanthate esterified starch, As etherified starch, such as acetate esterified starch, allyl etherified starch, methyl etherified starch, carboxymethyl etherified starch, hydroxyethyl etherified starch, hydroxypropyl etherified starch, etc., as cationized starch, starch and 2 -A reaction product of diethylaminoethyl chloride, a reaction product of starch and 2,3-epoxypropyltrimethylammonium chloride, such as a cross-linked starch, formaldehyde cross-linked starch, epichlorohydrin cross-linked starch, phosphate cross-linked starch, acrolein cross-linked starch, etc. Above all Raw starch is preferred from the viewpoint of ease of hand and economy.

  The starch content is preferably 0.1 to 40 parts by weight, particularly preferably 1 to 30 parts by weight, based on 100 parts by weight of the polyvinyl alcohol resin. If the content is too small, the effect of inhibiting blocking tends to be low and the effect of improving the mechanical strength tends to be small. If the content is too large, the appearance and tensile elongation of the film tend to be greatly reduced.

  Thus, in the present invention, a polyvinyl alcohol-based resin may be formed into a polyvinyl alcohol-based film by forming a film (film) containing a polyvinyl alcohol-based resin as a main component and containing additives such as a plasticizer and a surfactant. In this case, for example, a conventionally known method such as a casting method can be employed.

  In the present invention, the water content of the polyvinyl alcohol film is particularly preferably 3 to 10% by weight in terms of handling, and more preferably 3 to 9% by weight, particularly preferably 4 to 8% by weight. . If the moisture content of such a film is too low, tearing or cracking tends to occur during construction, and if it is too high, blocking tends to occur during storage.

  Examples of methods for adjusting the moisture content of the film to the above range include (1) a method of adjusting in the drying step during film formation, (2) a method of humidifying after film formation drying, and (3) again after film formation drying. The method of drying etc. are mentioned, Among these, the method of (2) is suitable.

  In the polyvinyl alcohol film used in the present invention, the thickness is preferably 20 to 50 μm, particularly preferably 25 to 40 μm. If the thickness is too thin, the film tends to be cracked or cracked during construction. If it is too thick, there is a tendency that the possibility of undissolved residue increases.

  The surface of the polyvinyl alcohol film may be a plane, but an embossed pattern or a satin pattern may be provided on one side or both sides of the film.

  It should be noted that the polyvinyl alcohol film of the present invention has other water-soluble polymers (sodium polyacrylate, polyethylene oxide, polyvinyl pyrrolidone, dextrin, chitosan, chitin, methylcellulose, hydroxyethylcellulose as long as the object of the present invention is not impaired. Etc.), fragrances, rust inhibitors, colorants, extenders, antifoaming agents, ultraviolet absorbers, and the like.

  Examples of the hydraulic composition used in the present invention include cement milk mainly containing cement, mortar, concrete, and the like, and those containing various cements and admixtures (agents) are targeted. For example, normal Portland cement, early strength Portland cement, blast furnace cement, fly ash cement and blast furnace slag, fly ash, silica fume, expansion material, bentonite, AE (air entrainment) agent, AE water reducing agent, water reducing agent, high performance This includes water reducing agents, high performance AE water reducing agents, accelerators, early strengthening agents, retarders, foaming agents, antifoaming agents, crack reducing agents, and the like.

Next, the wall surface forming method of the present invention will be described.
In forming the wall surface formed by curing the hydraulic composition, a waterproof layer is laminated on the surface of the substrate made of a cured product of the hydraulic composition, and then a polyvinyl alcohol film is laminated on the outside thereof. A wall surface can be formed by applying and curing the composition.
For example, the wall surface can be formed as follows.

That is, once the hydraulic composition is poured into a mold or the like and cured, a waterproofing agent is further applied to the base surface of the cured product to form a waterproof layer.
The waterproof layer can be formed by directly applying a waterproofing agent to the base of the cured product, or by applying a waterproofing agent after forming the primer layer, , Rubber, etc.) and a waterproofing agent is applied. The primer layer is used to increase the affinity with a hydraulic composition such as concrete because the waterproofing agent is a hydrophobic or water-repellent compound.
Thereafter, the hydraulic composition is again applied and cured from above the waterproof layer.
The hydraulic composition may be applied in multiple layers, and in that case, it is also preferable to provide a waterproof layer and a polyvinyl alcohol film between the layers.

Here, the application of the hydraulic composition means not only the application of the paste of the hydraulic composition, but also the operation of pouring and spraying, which is actually waterproof. The operation of forming a state of being laminated on the layer is also included.
The thickness of the waterproof layer is usually 1 mm to 10 mm, particularly 2 mm to 7 mm, more preferably 3 mm to 5 mm.

In addition, as an example of the wall surface formation of the present invention, the following tunnel construction method may be mentioned.
That is, after the rock drilling operation and the projecting operation are performed by the tunnel excavation process, the support operation is performed. In the support work, concrete is sprayed onto the excavated bedrock surface using a spraying machine so that the natural ground does not collapse. Next, concrete is driven in using a tunnel formwork. At this time, in order to prevent groundwater that oozes out of the ground from leaking into the tunnel, a waterproof layer is formed by applying a waterproofing agent after the concrete is sprayed and before the concrete is driven. Laminate the film. After laminating the polyvinyl alcohol film, concrete is driven. At this time, the compatibility between the waterproof layer and the poured concrete is improved, and the effect of improving the adhesion between the waterproof layer and the hardened concrete is obtained. In addition, since a polyvinyl alcohol-type film is a water-soluble film, it will swell and melt | dissolve.

  Thus, although the wall surface formed by curing the hydraulic composition is formed by the method of the present invention, the method of the present invention is effective for producing various civil engineering and architectural structures.

EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated further more concretely, this invention is not limited to a following example, unless the summary is exceeded.
In the examples, “parts” and “%” mean weight basis unless otherwise specified.

Example 1
Polyvinyl alcohol having a saponification degree of 88 mol% and a 4% aqueous solution viscosity of 42 mPa · s at 20 ° C. is dissolved in water to obtain a 22% aqueous solution, and glycerin 2 as a plasticizer with respect to 100 parts of the polyvinyl alcohol. 1 part of sorbitan ester ether and 2 parts of silicon dioxide as a surfactant were prepared to prepare a resin solution having a solid content of 28%, and the resulting resin solution was allowed to flow on the metal surface of an endless belt at 80 ° C. Then, it passed through four drying steps of 110 ° C.-120 ° C.-115 ° C.-100 ° C. for 45 seconds each and dried for a total of 3 minutes to obtain a polyvinyl alcohol film having a water content of 4% and a thickness of 30 μm.
Next, using the obtained polyvinyl alcohol film, it was affixed on a waterproof layer, and then cement concrete was applied to form a wall surface. As a result, the waterproof effect was obtained, there were no cracks, and the workability was good. It was. The adhesion between the waterproof layer and the concrete was also good.

(Example 2)
Polyvinyl alcohol having a saponification degree of 88 mol% and a 4% aqueous solution viscosity of 42 mPa · s at 20 ° C. is dissolved in water to obtain a 22% aqueous solution, and glycerin 2 as a plasticizer with respect to 100 parts of the polyvinyl alcohol. 1 part of sorbitan ester ether as a surfactant and 6 parts of raw starch were prepared to prepare a resin solution having a solid content of 28%, and the resulting resin solution was allowed to flow on the metal surface of an endless belt at 80 ° C. Then, it passed through four drying steps of 110 ° C.-120 ° C.-115 ° C.-100 ° C. for 45 seconds each and dried for a total of 3 minutes to obtain a polyvinyl alcohol film having a water content of 4% and a thickness of 30 μm.
Next, using the obtained polyvinyl alcohol film, it was affixed on the waterproof layer, and then the concrete was applied to form the wall surface. As a result, the waterproof effect was obtained, there were no cracks, and the workability was good. . The adhesion between the waterproof layer and the concrete was also good.

  The wall surface forming method of the present invention is very useful as a method with good workability when performing concrete construction in civil engineering and building structures.

Claims (3)

In forming the wall surface formed by curing the hydraulic composition, a waterproof layer is laminated on the surface of the substrate made of a cured product of the hydraulic composition, and then a polyvinyl alcohol film is laminated on the outside thereof. A method of forming a wall, comprising coating and curing the composition. The polyvinyl alcohol film is formed by forming a polyvinyl alcohol resin having a 4 wt% aqueous solution viscosity at 20 ° C of 10 to 70 mPa · s and an average saponification degree of 70 to 98 mol%. 1. The wall surface forming method according to 1. The wall surface forming method according to claim 1 or 2, wherein the polyvinyl alcohol film has a thickness of 20 to 50 µm.