JPH0283280A - Modifying agent for concrete surface layer, modification of concrete surface layer, formed concrete having modified surface layer, admixture for cement and cement - Google Patents

Abstract

PURPOSE:To obtain an agent for modifying the surface of concrete and having excellent effect in improving the water-proofness, gloss, adhesivity of organic paint, etc., by adding an N-long-chain acyl amino acid (or its water-soluble salt) as an active component to an aqueous liquid. CONSTITUTION:The objective agent for modifying the surface of concrete can be produced by adding an N-long-chain acyl amino acid or its water-soluble salt as an active component to an aqueous liquid. The N-long-chain acyl amino acid is preferably monoamino dicarboxylic acid (e.g., N-stearoylglutamic acid or N-lauroylaspartic acid). The surface of concrete is modified by applying an aqueous liquid containing the N-long-chain acyl amino acid (or its water-soluble salt) as an active component and preferably further applying an aqueous liquid containing a metal ion (e.g., Al ion) forming a water-insoluble salt with the N-long-chain acyl amino acid.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a concrete surface modifier, a method for modifying a conchnaut surface layer, a concrete molded product having a modified surface layer, an admixture for cement, and cement. It is something.

[Prior Art] The surfaces of concrete walls, floors, rooftops, etc. are modified for various purposes. For example, since concrete is permeable to water, it is modified to provide appropriate waterproofing. Conventionally used methods for waterproofing these concrete surfaces include asphalt waterproofing, cement mortar waterproofing, sheet waterproofing, paint film waterproofing, and methods for forming a waterproof layer on the concrete surface.

As a notebook waterproofing method, for example, Japanese Patent Application Laid-Open No. 61-1555
There is a method using a semi-vulcanized or non-vulcanized waterproof sheet made by mixing vulcanized rubber with depolymerized ethylene propylene rubber and adding necessary fillers, etc., as shown in Japanese Patent No. 43.

As a coating film waterproofing method, for example, Japanese Patent Application Laid-Open No. 61-21697
As shown in Publication No. 2, a volatile concrete neutralization inhibitor mainly composed of synthetic resin is sprayed on the surface of a reinforced concrete structure, dried, an adhesion promoter is applied on top of it, and then liquid silicone is applied. Some apply a rubber-based top coat.

As a method of forming a waterproof layer on the concrete surface, for example, as shown in Japanese Patent Application Laid-Open No. 60-228586,
There is one that applies a waterproofing composition consisting of a specific zirconium compound, an alkali metal salt of a higher fatty acid, another metal salt, a specific aqueous emulsion, hydraulic cement, a water-soluble polymer, and fine aggregate.

Furthermore, the modification of the concrete surface is not limited to the above-mentioned waterproofing, but is also carried out to improve the adhesion of paint applied later, and to improve the gloss of the concrete surface to improve its appearance.

[Problems to be solved by the invention] Among the surface modification methods described above, the asphalt waterproofing method has good workability on floors and ＼, but is difficult to apply on walls and is sensitive to temperature. Cement mortar waterproofing has the drawbacks of flowing easily in extreme heat and peeling off in cold weather. Although cement mortar waterproofing can be applied to walls, it has poor adhesion to the underlying concrete and is prone to cracking and peeling. Although it has good workability on walls, there are problems with adhesion to concrete surfaces and adhesion between sheets, and the waterproofing film method has poor workability on wall surfaces, and the water resistance of the formed paint film is poor. In addition, it is necessary to use a volatile petroleum-based organic solvent as a solvent.
There were also problems with the working environment.

Furthermore, with the above-mentioned method of forming a waterproof layer, the bond with the concrete layer is weak, the formation of insoluble salts is poor, and the alkali metal salts of higher fatty acids (surfactants)
may remain in that state, making it difficult to form complete waterproofness.

Therefore, the present invention solves the problems of the above-mentioned prior art, and
It has a strong bond with the concrete surface layer (in addition, it can reliably modify not only the surface but also the deep part of the surface layer, and the modified surface layer can be maintained for a long time.
Furthermore, a concrete surface layer modifier that can be easily used in a good waterproofing work environment, a method for modifying a concrete surface layer, a concrete molded product having a modified surface layer, a cement admixture, and the like. The present invention provides a cement containing.

[Means for Solving the Problems] What achieves the above object is a concrete surface layer modifier containing an N-long chain acylamino acid or a water-soluble salt thereof as an active ingredient in an aqueous liquid.

Further, it is preferable that the N-long chain acylamino acid is a monoamino dicarboxylic acid.

In addition, what achieves the above object includes a first liquid containing an N-long chain acylamino acid or a water-soluble salt thereof as an active ingredient in an aqueous liquid, and a first liquid containing the N-long chain acylamino acid and a water-insoluble salt in an aqueous liquid. a second liquid for applying to the application surface of the first liquid containing salt-forming metal ions as an active ingredient;
This is a concrete surface layer modifier consisting of a liquid.

Further, it is preferable that the long-chain acylamino acid is a monoamino dicarboxylic acid. Furthermore, it is preferable that the metal ion is at least one metal ion selected from aluminum ions, zinc ions, calcium ions, zirconium ions, and titanium ions. Furthermore, the second liquid includes aluminum ions, zinc ions, calcium ions, zirconium ions, titanium ions,
Iron ion, silver ion, copper ion, tin ion, chromium (3
It is preferable that the metal ion contains two or more types of metal ions selected from valence) ions.

Furthermore, the above object is achieved by a method for modifying a concrete surface layer in which an aqueous liquid containing an N-long chain acylamino acid or a water-soluble salt thereof as an active ingredient is applied to the concrete surface.

In addition, to achieve the above object, a first aqueous liquid containing an N-long chain acylamino acid or a water-soluble salt thereof as an active ingredient is applied to the concrete surface, and the N-long chain This is a method for modifying a concrete surface layer in which a second aqueous liquid containing as an active ingredient a metal ion that forms a water-insoluble salt with an acylamino acid is applied.

Moreover, what achieves the above object is a concrete molded product having a surface layer that has been modified by applying the above-mentioned concrete surface layer modifier.

In addition, to achieve the above purpose, N combined with calcium in the concrete is added to the surface layer of the concrete molding.
- Concrete moldings with a modified surface layer containing long-chain acylamino acids.

In addition, to achieve the above purpose, N is added to the surface layer of the concrete molding, which is combined with calcium in the concrete.
- A concrete molding having a modified surface layer containing long-chain acylamino acids and N-long-chain acylamino acids forming water-insoluble metal salts.

Further, what achieves the above object is a cement admixture containing a water-insoluble metal salt of an N-long chain acylamino acid, and a cement containing the same.

Therefore, the concrete surface layer modifier, the method for modifying the concrete surface layer, and the concrete molded product having the modified surface layer of the present invention will be explained using Examples.

The concrete surface layer modifier of the present invention contains an N-long chain acylamino acid or a water-soluble salt thereof as an active ingredient in an aqueous liquid.

The N-long chain acylamino acid used in the present invention is an amino acid having a long chain acyl group (fatty acid residue) at the N position.

The long-chain acyl group is preferably a higher fatty acid residue, such as a decanoyl group, lauroyl group, myristoyl group, valmitoyl group, stearoyl group, or oleoyl group. In particular, a stearoyl group is preferred from the viewpoint of stability. Further, the acyl group is not limited to a single type, and a plurality of types of the above-mentioned acyl groups may be used.

The amino acid may be monoaminomonocarboxylic acid, monoaminodicarboxylic acid, or diaminomonocarboxylic acid. It is preferable to use a substance that has high reactivity with calcium in the surface layer of concrete, and from this point of view, it is preferable to use monoamino dicarboxylic acid. Since this monoaminodicarboxylic acid has two carboxyl groups, calcium ions easily bind thereto, and it is strongly bound to the concrete surface layer.

Specific examples of amino acids include monoamino monocarboxylic acids such as gly7ine, alanine, valine, loinine, phenylalanine, thionine, threonine, tryptophan, and methionine, and monoaminodicarboxylic acids such as aspartic acid, Glutamic acid, and diaminomonocarboxylic acids include lysine, arginine, and histidine. Therefore, preferred specific examples of the N-long chain acylamino acids used in the present invention include N-stearoylglutamic acid, N-lauroylglutamic acid, N-myristoylglutamic acid, N-stearoyl aspartic acid, N-lauroyl aspartic acid, and N-myristoyl asparagine. acid, N-stearoylglutamic acid, N
- lauroyl glutamic acid, N-myristoyl glutamic acid, N-stearoyl aspartic acid, N-lauroyl aspartic acid, N-myristoyl aspartic acid,
N-stearoylvaline, N-lauroylvaline, N-
Myristoylvaline, N-stearoylvaline, N-lauroylvaline, N-myristoylvaline, N-stearoylphenylalanine, N-lauroylphenylalanine, N-myristoylphenylalanine, N-stearoylphenylalanine, N-lauroylphenylalanine, N-myristoylphenylalanine, N- Stearoyl arginine, N-lauroyl arginine, N-myristoyl arginine, N-stearoyl arginine,
These include N-lauroyl arginine and N-myristoyl arginine.

The above-mentioned N-long chain acylamino acids may be in the form of salts as long as they are water-soluble, and alkali metal salts such as sodium and potassium of the above-mentioned N-acylamino acids can also be suitably used.

The above-mentioned N-acylamino acid or its salt is dissolved in an aqueous liquid. The aqueous liquid is preferably water, particularly preferably distilled water that does not contain metal ions that form insoluble salts with N-acylamino acids. The above-mentioned N-acylamino acid or its salt is contained in the above-mentioned aqueous liquid in an amount of 1 to 10% by weight, preferably 3 to 5% by weight.

Cement agents constituting concrete to which the concrete surface layer modifier of the present invention is applied include portland cement, alumina cement, slag cement,
It can be used for various things such as mixed cement. In particular, many (
It is effective for Portland cement containing calcium. Furthermore, it is particularly effective for locations and members where the concrete surface has been formed within two years and has a relatively large amount of calcium present in the surface layer. In addition, it is sufficiently effective even if two years or more have passed in places and parts that have relatively little contact with water or the like.

Next, a method for modifying a concrete surface layer using the above concrete modifier will be explained.

In this method, an aqueous liquid containing an N-long chain acylamino acid or a water-soluble salt thereof as an active ingredient is applied to the concrete surface.

As the aqueous liquid, those mentioned above can be suitably used.

By applying this aqueous liquid to the concrete surface, the N-long chain acylamino acids contained in the aqueous liquid have a surfactant effect, so they penetrate into the pores of the concrete surface layer. , reacts with calcium in the concrete surface layer and becomes a calcium salt of N-long chain acylamino acid, becoming insoluble and stable. Therefore, it is firmly incorporated into the concrete surface layer (in the form of a rust) and becomes stable.The surface layer has waterproof properties due to the N-long chain acyl group of the N-long chain acylamino acid. This N-
The long-chain acyl group improves surface gloss and
When applying an organic paint later, it functions effectively as a base agent to improve the adhesion.

The application amount of this concrete surface layer modifier is 50/1 at the above concentration of N-long chain acylamino acid.
~1oooiQ/R” or so, preferably 100 touge 71
It is about 1'' to 500*Q/*''. The coating method can be performed by a known method such as a method using a spatula, a brush, etc., or a method using a spray. After coating, it is only necessary to leave it to dry naturally, and the surface layer can be modified very easily. In this method, the surface layer modifier uses an aqueous liquid as a solvent, so it does not have a negative impact on the worker or the surroundings during work, and the N long chain acylamino acids contained are also harmful to living organisms. It is extremely safe and is safe in this respect as well.

Next, the concrete surface layer modifier of the second invention will be explained.

This concrete surface layer modifier includes a first liquid containing an N-long chain acylamino acid or a water-soluble salt thereof as an active ingredient in an aqueous liquid, and a first liquid containing the N-long chain acylamino acid and a water-insoluble salt in an aqueous liquid. and a second liquid to be applied to the coating surface of the first liquid, which contains metal ions forming as an active ingredient.

As the first liquid containing the N-long chain acylamino acid or its water-soluble salt as an active ingredient in the aqueous liquid, those mentioned above can be suitably used.

The metal ions contained in the second liquid include aluminum ions, zinc ions, calcium ions, zirconium ions, titanium ions, Chichi ions, silver ions, copper ions, tin ions, chromium (trivalent) ions, etc. Those that form water-insoluble salts with the above-mentioned N long-chain acylamino acids are used. If the purpose of this concrete surface layer modifier is to impart waterproofness, the metal ions should be selected from aluminum ions, zinc ions, calcium ions, zirconium ions, titanium ions, and tin ions. One type or two or more types are preferably used. In addition, when the concrete surface layer modifier is intended for antibacterial and antifungal properties of the concrete surface layer, one type selected from silver ions, copper ions, tin ions, iron ions, chromium (trivalent) ions or 2
More than one species is preferably used. When the purpose of the concrete surface layer modifier is to impart both waterproof properties and impart antibacterial and antifungal properties, each of the above-mentioned metal ions may be contained. The second liquid, like the first liquid described above, is an aqueous liquid, preferably distilled water.

The metal ions mentioned above are contained (dissolved) in the form of ions in this aqueous liquid. Specifically, water-soluble salts such as sulfates, nitrates, carbonates, and hydrochlorides are contained. It is preferable that the second liquid has no solubility in calcium in concrete, and it is preferable to use a sulfate that forms an insoluble salt with calcium. Metal ions are contained in the second liquid in an amount of 0.1% to 10%.
, preferably 0.5 to 5%.

Further, the metal ion and the N-acylamino acid form a chemical equivalence ratio l·l bond.

Next, a method for modifying a concrete surface layer using the above concrete surface layer modifier will be explained.

In this method, a first aqueous liquid containing an N-long chain acylamino acid or a water-soluble salt thereof as an active ingredient is applied to the concrete surface, and the N-long chain acylamino acid A second aqueous liquid (second liquid) containing as an active ingredient a metal ion that forms a water-insoluble salt is applied.

The method described above can be suitably used for applying the first liquid containing the N-4 chain acylamino acid or its water-soluble salt as an active ingredient. The second liquid is applied onto the surface to which the first liquid has been applied. It is preferable to apply the first liquid before the surface to which the first liquid is applied is completely dry. As with the first liquid, the second liquid can be applied by a known method such as a brush, a method using a brush, a spray method, or the like. The amount of the second liquid to be applied is 50zQ/x" to 100% depending on the metal ion concentration mentioned above.
About 0++Q/*”, preferably 1OOIQ/It~
5001Q/1". After coating, it is only necessary to leave it to dry naturally, and the surface layer can be modified very easily. In other words, by applying this second liquid, the surface layer can be modified very easily. The N-acyl amino acid in the first solution reacts with the metal ion in the second solution (ion exchange) to form a water-insoluble salt, and the insoluble salt has waterproof, antibacterial, and antifungal properties. It exhibits the following effects in the concrete surface layer and exhibits a high reforming effect.

Furthermore, when the first liquid was applied, N formed an insoluble salt with calcium that was present in the concrete surface layer.
Non-water bonds are formed with the -acyl amino acid at the unreacted N-anlu group portion, and the amino acid is firmly incorporated into the surface layer. Therefore, the effect of modifying the concrete surface layer is maintained over a long period of time.

Further, by using different types of metal ions, it is possible to perform a composite surface layer modification that imparts waterproof properties, antibacterial properties, and antifungal properties. Furthermore, the modified layer formed by a plurality of metals on the surface layer is finer-grained (i.e., a modified layer is formed in which metals are densely packed together) than a modified layer formed by a single metal. Like the first liquid, the second liquid also uses an aqueous liquid as a solvent, so it does not have a negative impact on the worker or the surroundings during work, and the metal salts it contains are low in concentration and safe. is high.

Next, a concrete molded article having a modified surface layer according to the present invention will be explained.

This concrete molding has a modified surface layer having N-long chain acylamino acids bonded to calcium in the concrete on the surface layer of the concrete molding.

Concrete molded products include concrete blocks,
Possible materials include concrete tiles, concrete panels, utility poles, concrete piles, and tetrapods.

And, as a cement agent that makes up concrete,
Various cements such as Portland cement, alumina cement, slag cement, and mixed cement can be used. In particular, it is preferable to use Portland cement, which contains a large amount of calcium. Then, N combined with calcium in the concrete is added to the surface layer of the concrete molding.
- Formation of a modified surface layer containing long-chain acylamino acids is carried out by applying an aqueous liquid containing N-long-chain acylamino acids or a water-soluble salt thereof as an active ingredient to the surface of the concrete molding. Can be done. By applying this aqueous liquid to the concrete surface, the N-long chain acylamino acids contained in the aqueous liquid have a surfactant effect, so they penetrate into the pores of the concrete surface layer and It reacts almost quantitatively with calcium in the surface layer, becoming a calcium salt of N-long chain acylamino acid, becoming insoluble and stable.

Therefore, the bar is firmly wedged into the concrete surface layer and becomes stable. The surface layer is modified by the N-long chain acyl group of the N-long chain acylamino acid into a surface layer that develops waterproof properties. Also. This N-long-chain anlu group improves the surface gloss, and when an organic paint is applied later, it functions effectively as a base agent to improve the adhesion of the organic paint.

The application method includes immersing the concrete molded product in a liquid tank in which the above-mentioned liquid is stored and drying it, applying it to the surface of the concrete molding using a brush, spraying, etc. This can be carried out by a known method such as the above method. This concrete molded product has N-acylamino acids that form insoluble salts with calcium contained in the concrete surface layer, and this N-acylamino acid is firmly incorporated into the surface layer. , maintaining the modification effect of the concrete surface layer over a long period of time.

Also, a second concrete molded product having a modified surface layer of the present invention will be explained.

This concrete molding has N-long chain acylamino acids combined with calcium in the concrete and water-insoluble metal salts formed on the surface layer of the concrete molding.
- a modified surface layer containing long chain acylamino acids.

As the cement constituting the concrete molded product and concrete, the above-mentioned cements can be suitably used. Furthermore, the method and content of N-long chain acylamino acids bonded to calcium in the concrete can be preferably used in the surface layer of the concrete molding.

The method of incorporating N-long chain acylamino acids and water-insoluble metal salts into the concrete surface layer is to add N-long chain acylamino acids bound to calcium in the concrete to the surface layer of the concrete molding. After applying an aqueous liquid containing N-41 acylamino acid or a water-soluble salt thereof as an active ingredient to the surface of the concrete molding, this N-long chain acylamino acid and an insoluble salt are applied. Applying a liquid containing salt-forming metal ions, such as aluminum ions, zinc ions, calcium ions, zirconium ions, titanium ions, iron ions, silver ions, copper ions, cations, chromium (trivalent) ions, etc. This is done by

If the purpose of this concrete surface layer modifier is to impart waterproofness, the metal ions should be selected from aluminum ions, zinc ions, calcium ions, zirconium ions, titanium ions, and tin ions. One type or two or more types are preferably used.

In addition, when the concrete surface layer modifier is intended for antibacterial and antifungal properties of the concrete surface layer, one type selected from silver ions, copper ions, tin ions, iron ions, chromium (trivalent) ions or Two or more types are preferably used. When the purpose of the concrete surface layer modifier is to impart both waterproof properties and impart antibacterial and antifungal properties, each of the above-mentioned metal ions may be contained.

Methods for applying this liquid include immersing the concrete molding in a liquid tank in which this liquid is stored, brushing,
It can be applied by a known method such as applying with a brush or the like or spraying. In this concrete molded product, the calcium contained in the concrete surface layer forms an insoluble salt with the N-acyl amino acid and the N-acyl group forms a non-water bond, and is firmly incorporated into the surface layer. . Therefore, the effect of modifying the concrete surface layer is maintained over a long period of time. Therefore, even under adverse conditions such as contact with seawater, the surface layer modification effect can be maintained over a long period of time.

Next, the cement admixture of the present invention and the cement containing the same will be explained.

The cement admixture of the present invention contains a water-insoluble N-long chain acylamino acid salt.

The cement admixture of the present invention can be used in various cements such as Portland cement, alumina cement, slag cement, and mixed cement.

The N-i chain aryl/amino acid salt is an amino acid salt having a long chain acyl group (fatty acid residue) at the N-position.

The long-chain acyl group is preferably a higher fatty acid residue, such as a decanoyl group, lauroyl group, myristoyl group, valmitoyl group, stearoyl group, or oleoyl group. In particular, a stearoyl group is preferred from the viewpoint of stability. In addition, the acyl group is not limited to a single type, and multiple types of the above acyl groups may be used.1.Amino acids include monoaminodicarboxylic acid, monoaminodicarboxylic acid, and diaminomonocarboxylic acid. Either is fine. It is preferable that the metal content is high, and from this point of view, it is preferable to use monoamino dicarboxylic acid.

Since this monoaminodicarboxylic acid has two carboxyl groups, metals are easily bonded to it, and concrete can be modified with a small amount.

Preferred specific examples of the N-long chain acylamino acid salts used in the present invention include N-stearoylglutamate,
N-lauroyl glutamate, N-myristoyl glutamate, N-stearoyl aspartate, N-
lauroyl aspartate, N-myristoyl group 1
<Laginate, N-stearoylglutamate, N-
lauroyl glutamate, N-myristoyl glutamate, N-stearoyl asno(laginate, N-lauroyl aspartate, N-myristoyl aspartate, N-stearoyl valine salt, N-lauroyl 1(phosphorus salt, N-myristoyl) Valine salt, N-stearoylvaline salt, N-lauroylvaline salt, N-myristoylvaline salt, N-stearoylphenylalanine salt,
N-lauroyl phenylalanine salt, N-myristoyl phenylalanine salt, N-stearoyl phenylalanine salt, N-lauroyl phenylalanine salt, N-myristoyl phenylalanine salt, N-stearoyl arginine salt, N-lauroyl arginine salt, N-myristoyl arginine salt, N-stearoyl These include arginine salt, N-lauroyl arginine salt, N-myristoyl alkinine salt, and the like.

The above N-long chain acylamino acid salt is a water-insoluble salt. The metal forming the salt is preferably at least one metal selected from aluminum, zinc, calcium, zirconium, and titanium.

By incorporating these metal salts into cement, water repellency can be imparted to the cement molded product.

Furthermore, by containing a metal salt selected from iron, silver, copper, tin, and chromium (trivalent), antibacterial and antifungal properties can be imparted to the cement molded product. Cement admixture is a material other than cement, water, and plaster that is added to mortar or concrete as necessary when mixing wires, and is 0.5-5% of the total amount, 1-3% of the total amount. % is added.

Particularly preferable N-acylamino acid salts used in the present invention are aluminum N-stearoyl-L-glutamate, calcium N-stearoyl-L-glutamate, and silver N-stearoyl-L-glutamate. may be mixed.

[Example] Next, the present invention will be explained in detail.

(Example X) N-J% chain theacyl amino acid alkali metal salt and
Using disodium N-stearoyl-thi-glutamate (manufactured by Ajinomoto Co., Inc., trade name Amisoft I (S-21), dissolve 509 parts of disodium p4-stearoyl-thi-glutamate in 1 part of water, A concrete surface layer modifier (N-long chain acylamino acid concentration: 5%) was created.

(N-long chain acyl amino acid concentration 5%) was prepared.

(Example 2) Monosodium N-stearoyl-glutamate (
Manufactured by Ajinomoto Co., Inc., product name: Amisoft 1 (S-11)
An aqueous solution of 30g dissolved in water IQ (first liquid, tonneau)
A long-chain acyl amino acid (concentration: 3%) was prepared. An aqueous solution (second liquid, aluminum sulfate concentration 5%) was prepared by dissolving aluminum sulfate 509 in water IQ.

(Example 3) Monosodium N-stearoyl-L-glutamate (
Manufactured by Ajinomoto Co., Inc., product name Amisof 1-113-11)
An aqueous solution of 30g dissolved in water IQ (No. 1i02, N
- long chain acyl amino acid concentration 3%). An aqueous solution of 25 g of aluminum sulfate and 259 g of zinc sulfate dissolved in water IQ (Part 2e, Aluminum sulfate 2.5%
, zinc sulfate concentration 2.5%).

(Example 4) Monosodium N-stearoyl-L-glutamate (
An aqueous solution (liquid X, N-long chain acylamino acid concentration: 3%) was prepared by dissolving 309 (manufactured by Ajinomoto Co., Inc., trade name: Amisoft Its-11) in water IQ. Aqueous solution of aluminum sulfate 509 and silver sulfate 0.19 dissolved in water IQ (second solution, aluminum sulfate concentration 5%, silver sulfate concentration 0)
．． 01%) was created.

[Experiment] A concrete surface (outdoors that comes into contact with wind and rain under normal conditions) that has been formed for more than 10 years is placed at 0.5m'.
100 cc of the concrete surface layer modifier of Example 1 was added to
It was applied using a sieve and allowed to air dry.

100 cc of the first liquid of the concrete surface layer modifier of Examples 2 and 4 was applied to a similar concrete surface of 05 m2, and before the surface was dry, 100 cc of the second liquid was applied and allowed to air dry.

After being left for one month under normal conditions, water was sprinkled on each of the modifier-coated surfaces, and the waterproof state was maintained.

[Effect of the invention] The concrete surface layer modifier of the present invention adds N- to the aqueous liquid.
Since it contains long-chain acylamino acids or their water-soluble salts as active ingredients, by applying this modifier to the concrete surface, the N-long-chain acylamino acids contained have a surfactant effect. Therefore, it penetrates into the pores of the concrete surface layer, reacts with calcium in the concrete surface layer, becomes a calcium salt of N-long chain acylamino acids, becomes insoluble, and becomes stable. Therefore, it is firmly incorporated into the concrete surface layer in the form of a wedge, and the surface layer is modified into a waterproof surface layer by the N-long chain anchor group of the N-long chain acylamino acid. Also. This N long-chain acyl group not only improves the gloss of the surface, but also functions effectively as a base agent to improve the adhesion of organic paints when applied later.

Further, the concrete surface layer modifier of the present invention includes a first liquid containing an N-long chain acylamino acid or a water-soluble salt thereof as an active ingredient in an aqueous liquid; The second liquid contains metal ions that form water-insoluble salts as an active ingredient and is applied to the surface of the concrete. An insoluble N-acylamino acid salt is formed with calcium, and further, the N-acylamino acid salt in the first liquid reacts with the metal ion in the second liquid (
ion exchange) to form an insoluble salt in water, and the insoluble salt exerts its waterproof, antibacterial, and antifungal properties in the concrete surface layer, resulting in a high reforming effect. Furthermore, this insoluble salt is composed of the N-acyl amino acid and N-
It forms a non-water bond at the aryl group and is firmly incorporated into the surface layer. Therefore, the effect of modifying the concrete surface layer is maintained over a long period of time. Furthermore, by using different types of metal ions, it is possible to perform complex surface layer modification such as imparting waterproof properties, antibacterial properties, and antifungal properties.

Further, the method for modifying a concrete surface layer of the present invention is to apply an aqueous liquid containing an N-long chain acylamino acid or a water-soluble salt thereof as an active ingredient to the concrete surface, and to modify the surface layer. Since the agent uses an aqueous liquid as a solvent, it does not have a negative impact on the worker or the surrounding area during work, and the N-long chain acylamino acid contained is extremely safe for living organisms. Furthermore, since it is only applied by a known method, it is possible to modify the concrete surface layer extremely easily.

Further, the method for modifying a concrete surface layer of the present invention includes applying a first aqueous liquid containing an N-long chain acylamino acid or a water-soluble salt thereof as an active ingredient to the concrete surface; A second aqueous liquid containing an N-long chain acylamino acid and a metal ion forming a water-insoluble salt as an active ingredient is applied.Similar to the first liquid, the second liquid also uses an aqueous liquid as a solvent. Therefore, it does not have a negative impact on the worker or the surrounding area during work, and the concentration of metal ions contained therein may be low.
Highly safe.

Furthermore, since the first liquid and the second liquid are simply applied by a known method, the concrete surface layer can be modified extremely easily.

Furthermore, the concrete molded product of the present invention has N-long chain acylamino acids bonded to calcium in the concrete in the surface layer of the concrete molded product, and N-acyl amino acids that have formed an insoluble salt with carunium. Since the N-acyl amino acid is firmly incorporated into the surface layer, it maintains the effect of modifying the concrete surface layer over a long period of time.

In addition, the concrete molded product of the present invention has N-long chain acylamino acids bonded to calcium in the concrete and N-long chain acylamino acids forming a water-insoluble total salt in the surface layer of the concrete molded product. This concrete molding contains N which has formed an insoluble salt with the calcium contained in the concrete surface layer.
-A non-water bond is formed between the acylamino acid and the N-anlu group,
Since it has a water-insoluble N-long chain acylamino acid salt firmly incorporated into the surface layer, it maintains the effect of modifying the concrete surface layer over a long period of time. Therefore, even under adverse conditions such as contact with seawater, the surface layer modification effect can be maintained over a long period of time.

Further, the cement admixture of the present invention and the cement containing the same contain a water-insoluble N-long chain acylamino acid salt, and since this N-acylamino acid salt is insoluble in water, It can be easily mixed with the cement agent, does not easily flow out, and can effectively modify the entire cement material.

Claims (1)

[Scope of Claims] (1) A concrete surface layer modifier characterized in that an aqueous liquid contains an N-long chain acylamino acid or a water-soluble salt thereof as an active ingredient. (2) The concrete surface layer modifier according to claim 1, wherein the N-long chain acylamino acid is a monoaminodicarboxylic acid. (3) A first liquid containing an N-long chain acylamino acid or a water-soluble salt thereof as an active ingredient in an aqueous liquid, and a metal ion that forms a water-insoluble salt with the N-long chain acylamino acid in the aqueous liquid. A concrete surface layer modifier characterized by comprising a second liquid for coating on the application surface of the first liquid containing as an active ingredient. (4) The concrete surface layer modifier according to claim 3, wherein the long-chain acylamino acid is a monoaminodicarboxylic acid. (5) The concrete surface layer modifier according to claim 3 or 4, wherein the metal ion is at least one metal ion selected from aluminum ions, zinc ions, calcium ions, zirconium ions, and titanium ions. (6) The second liquid contains two or more types selected from aluminum ions, zinc ions, calcium ions, zirconium ions, titanium ions, iron ions, silver ions, copper ions, tin ions, and chromium (trivalent) ions. The two-component concrete surface modifier according to claim 3 or 4, which contains metal ions. (7) A method for modifying a concrete surface layer, which comprises applying an aqueous liquid containing an N-long chain acylamino acid or a water-soluble salt thereof as an active ingredient to the concrete surface. (8) Applying a first aqueous liquid containing an N-long chain acylamino acid or a water-soluble salt thereof as an active ingredient to the concrete surface, and applying the N-long chain acylamino acid and the water-insoluble salt to the applied surface. A method for modifying a concrete surface layer, comprising applying a second aqueous liquid containing metal ions as an active ingredient to form a concrete surface layer. (9) A concrete molded product having a modified surface layer coated with the concrete surface modifier according to claim 1 or 2. (10) A concrete molded product having a modified surface layer coated with the concrete surface modifier according to any one of claims 3 to 6. (11) A concrete molded product having a modified surface layer characterized in that the surface layer of the concrete molded product contains an N-long chain acylamino acid bonded to calcium in the concrete. (12) The surface layer of the concrete molding is characterized by containing N-long chain acylamino acids bonded to calcium in the concrete and N-long chain acylamino acids forming water-insoluble metal salts. Concrete molding with a modified surface layer. (13) The concrete molded product having a modified surface layer according to claim 12, wherein the N-long chain acylamino acid is a monoaminodicarboxylic acid. (14) The concrete molded article having a modified surface layer according to claim 12 or 13, wherein the metal is at least one metal selected from aluminum, zinc, calcium, zirconium, and titanium. (15) The metal salt is a silver salt, a copper salt, an aluminum salt,
zinc salt, calcium salt, zirconium salt, iron salt, tin salt,
The concrete molded product having a modified surface layer according to claim 12 or 13, which is made of two or more metal salts selected from titanium salts and chromium (trivalent) salts. (16) A cement modifier characterized by containing a water-insoluble metal salt of an N-long chain acylamino acid. (17) The cement modifier according to claim 16, wherein the metal salt is at least one metal salt selected from aluminum salts, zinc salts, calcium salts, zirconium salts, and titanium salts. (18) The metal salt is two or more metals selected from silver salt, copper salt, aluminum salt, zinc salt, calcium salt, zirconium salt, iron salt, tin salt, titanium salt, and chromium (trivalent) salt. The cement modifier according to claim 16, which is a salt. (19) A cement comprising the cement modifier according to any one of claims 16 to 18.