JP2003246662A - Agent for strengthening adhesion of concrete and method of constructing wall strengthened in adhesion to mortar - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wall strengthened in adhesion to mortar, in which the adhesion of mortar to the substrate is enhanced in a positive manner. <P>SOLUTION: A framework 4 on whose inner surface an adhesion-strengthening agent 5 for concrete and the like, obtained by mixing a fiber-reinforcing material 3 of cement-based hardening material and a water-soluble or alkali-soluble adhesive or an adhesive being decomposed with an alkali, has been coated or laminated is used, and concrete 1 is charged in the framework 4, solidified, and cured. Then, the framework is detached. The fiber-reinforcing material 3 is hair-planted in the concrete in such a manner that the one side of the fiber is taken in the concrete and the other end is exposed. The adhesion of mortar to the concrete can be strengthened by coating the mortar 2 on the surface of such concrete. The wall strengthened in adhesion to mortar is useful for mortar inner and outer walls, a ceiling or a floor surface of a concrete building structure. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a concrete adhesion strengthening agent, a formwork panel, a mortar adhesion strengthening wall, and a concrete adhesion strengthening agent for strengthening the adhesion between an undercoat of concrete and a cement-based finishing material such as mortar applied to the undercoat surface. Mortar adhesion strengthening wall construction method.

[0002]

2. Description of the Related Art Cement-based hardening materials such as concrete used for buildings are often coated with a cement-based finishing material such as mortar and laminated to improve the appearance and prevent rainwater from penetrating. When these structures are used for a long period of time, the finish may crack and peel off, which may cause a safety problem in appearance. In order to solve such a problem, it has been attempted for a long time to make unevenness on the surface of the base or to improve the adhesiveness with a finishing material such as mortar by using an adhesive.

[0003]

Although many proposals have been made for improving the adhesion between the concrete underlayer and the finishing material, they have not been completely solved. The present invention has been completed as a result of research with the object of strengthening the adhesiveness between a concrete base and a finishing material.

[0004]

In order to solve the above problems, the present invention provides a concrete adhesion strengthening characterized in that a fiber reinforcing material for a cement-based hardening material and a water-soluble adhesive are mixed. Agent (“adhesion enhancer” in this description)
For short). As the adhesive to be mixed, an alkali-soluble or alkali-decomposable adhesive can also be used. Adhesives containing one or more compounds selected from acrylic resins such as starch, ethyl cellulose, carboxymethyl cellulose, polyvinyl alcohol, polyacrylic acid, acrylic acid or methacrylic acid and sodium polystyrene sulfonate as a main component are preferable. Is.

The fiber reinforcement has a fiber length of 1 to 25 m.
m is suitable, the single yarn fineness is preferably 4 to 80 dtex, and a modified cross-section yarn is preferably used. A polyamide-based reinforcing fiber is desirable as the reinforcing fiber material.

It is convenient for the adhesive to be in a liquid or paste form, and for the adhesion enhancer to be formed in a film form. If it is laminated on a release liner (also called release paper), it contributes to the improvement of workability. It is also possible to apply or laminate the above-mentioned adhesion enhancer on the concrete molding surface of the formwork panel in advance.

Further, the present invention provides a mortar adhesion strengthening wall characterized in that a mortar is laminated on the surface of a concrete substrate constructed by using the above adhesion strengthening agent. Furthermore, concrete is poured into a formwork in which the adhesion enhancer is applied or laminated on the inner surface, solidified and cured,
Provided is a mortar adhesion strengthening wall construction method, characterized in that a mold is removed and mortar is applied to the surface thereof.
Further, the amount of the concrete adhesion enhancer used is preferably ^{2 to} 30 g per 1 m ^{2 of} the base, based on the amount of the fiber reinforcing material.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing a procedure for constructing a mortar adhesion strengthening wall of the present invention. According to the present invention, a large number of fiber reinforcements 3 are firmly planted on the surface of the base 1, and the mortar 2 is applied on the surface to allow the planted hairs protruding from the surface of the base to enter the mortar 2 to form the base 1 and the mortar 2. And (and d in FIG. 1). Base 1
In the present invention, the form 4 for concrete pouring is used in order to implant the fiber reinforcing material 3 therein to make it into a hair-implanted state. More specifically, the molding surface of the mold 4 is coated with the adhesion strengthening agent 5 of the present invention, which is a mixture of the fiber reinforcing material 3 of the cement-based hardening material and the water-soluble, alkali-soluble or alkali-decomposable adhesive. Alternatively, after stacking (a in FIG. 1) and injecting concrete 1 into the mold 4 to solidify and cure (b in FIG. 1),
By removing the formwork 4, the fiber reinforcement 3 is placed on the base 1
The surface can be flocked (FIG. 1c).

The adhesive in the adhesion-strengthening agent of the present invention applied or laminated on the molding surface of the mold is dissolved in order from the surface in direct contact with the concrete when pouring a strongly alkaline concrete in which water or aggregate is mixed into cement. , Or decomposed and mixed, part of the fiber reinforcement enters into the concrete and solidifies together with the concrete. But,
The fiber reinforcement near the formwork does not enter the concrete, but remains on the surface and solidifies.
It is considered that one end of the fiber reinforcing material is planted in the concrete and the other is exposed and protruded from the concrete surface to be transplanted. When mortar is applied to this surface, the fiber reinforcing material exposed and projected from the surface is taken into the mortar, and the adhesive that adheres is dissolved or decomposed and fixed to the mortar.

As the adhesive that can be used in the present invention, one or two selected from starch, ethyl cellulose, carboxymethyl cellulose, polyvinyl alcohol, polyacrylic acid, acrylic resin such as acrylic acid or methacrylic acid, and sodium polystyrene sulfonate. A water-soluble or alkali-decomposable adhesive containing at least one compound as a main component is preferably used.

The fiber reinforcement used in the present invention has a length of usually about 1 to 25 mm, preferably 3 to 10 mm. If it is less than 1 mm, the bond length with the base or mortar is insufficient, and the desired coupling effect cannot be obtained.
Further, if it exceeds 25 mm, the dispersibility is deteriorated for the coupling effect and the workability is deteriorated. In addition to this, elongation is preferably 1
A material having a strength of 5% or more and a strength of 5.5 cN / dtex or more is used. Further, two or more kinds of fiber reinforcing materials having different lengths may be mixed and used. By mixing two or more kinds of fiber reinforcements having a fiber length in the range of 1 to 25 mm and different lengths, uniform mixing with the adhesive can be improved. The ratio of the fiber lengths to be mixed is preferably in the range of 1.5 to 4 times.

The single yarn fineness of the fiber reinforcing material is usually 4 to 80.
This is the range of dtex. Particularly, those having 20 to 50 dtex are preferable. If the single yarn fineness is less than 4 dtex, it is too small and the dispersion in the adhesive becomes non-uniform, making it easy to form fiber balls, and it may not be possible to obtain a sufficient effect of bonding to the base and mortar. On the other hand, when it exceeds 80 dtex, the adhesion area with the mortar decreases and it becomes difficult to sufficiently exhibit the binding effect. So-called denier mix, that is, two or more kinds of reinforcing fibers having a single yarn fineness of 4 to 80 dtex and different fineness can be mixed and used. The use of reinforcing fibers having different finenesses has the advantage of improving dispersibility in the adhesive. The fineness of the reinforcing fibers to be mixed is 1.
A range of 5 to 4 times is preferable. The cross-sectional shape of the fiber reinforcement is
Not limited to a circular shape, a so-called irregularly shaped cross-section yarn such as a triangular shape, an elliptical shape, a Y-shape, a hollow shape can be preferably used.

The fiber reinforcing material used in the present invention is required to have alkali resistance and to have high tensile strength and elongation. The polyamide-based fiber reinforcing material has large alkali resistance, proper water absorption and hydrophilicity, and high tensile strength and elongation as compared with natural fiber reinforcing materials and other synthetic fiber reinforcing materials.
In addition, it has excellent dispersibility in the adhesive and has the major feature of being easily compatible with mortar. Furthermore, the polyamide-based reinforcing fiber is water-retentive, has the effect of preventing dryout of mortar, and is excellent in workability and is suitable.

As the polyamide fibers, there may be mentioned polyamide fibers made of polyamide or mainly containing polyamide, among which so-called nylon fibers are preferably used. As the nylon, nylon 6, nylon 66, highly shrinkable copolymer nylon, flexible copolymer nylon, etc. are suitable.

The adhesion-reinforcing agent of the present invention varies depending on the kind of the fiber reinforcing material to be used, but in general, the fiber reinforcing material to be applied or laminated per 1 m ² of the base is about ² to 30 g, preferably 5 to 15 g. A reinforcing agent may be applied or laminated. Although it depends on the type of adhesive to be mixed and the like, as an adhesion enhancer, it is usually 1 per 1 m ^{2 of} the base.
It is preferable to apply or laminate about 00 to 1,000 g. Further, in the adhesion strengthening agent of the present invention, required components other than the above-mentioned adhesive agent and fiber reinforcing material can be added if necessary.

The form of the adhesion-strengthening agent of the present invention is convenient for applying or laminating a required amount on the formwork surface, and is not particularly limited unless it peels off from the formwork surface when pouring concrete or the fiber reinforcing material falls out. Alternatively, the fiber reinforcing material may be pressure-bonded to the surface of the mold while being sprinkled with an adhesive, and generally in liquid or paste form. It can also be formed into a film and attached to a mold.

It is also useful to attach a release liner (also referred to as release paper) to the adhesion-strengthening agent of the present invention formed on a sheet because it is easy to store and the construction efficiency can be improved. Alternatively, it is also a useful means to improve the on-site construction efficiency by preparing in advance plywood for formwork, which is coated or laminated with the present adhesion strengthening agent, in a manufacturing plant or the like.

The formwork according to the present invention can be removed and reused as a formwork after concrete curing is completed. The formwork may be made of wood or metal. Further, the mortar adhesion strengthened wall of the present invention includes not only ordinary vertical inner and outer wall surfaces, but also mortar finished surfaces of various concrete structures such as floor surfaces, ceiling surfaces and paste surfaces.

It is desirable to use a mortar containing a fiber reinforcing material as the mortar to be used in the adhesion strengthening agent of the present invention, or in the mortar adhesion strengthening wall of the present invention or the method for constructing the same. At the same time as the adhesive strength between the base and the mortar is strengthened, the strength of the mortar itself is strengthened,
Prevents mortar from cracking and peeling by the synergistic effect of both
The safety and appearance can be improved. Similarly, when the finishing mortar material is applied to the surface of the mortar, the fiber reinforcing material may be mixed with the finishing material.

[0020]

EXAMPLES The effects of the present invention have been confirmed by actual construction, and an example thereof will be described. Example 1 To 100 parts by weight of a 15% by weight aqueous solution of polyvinyl alcohol, 2 parts by weight of nylon 6 fiber having a fiber length of 5 mm and a single yarn fineness of 25 dtex was added and mixed, and the mixture was applied to the inner surface of the concrete side of the formwork. After the natural drying, concrete was poured into the mold to solidify and cure, and the mold was removed. As a result, polyvinyl alcohol was eluted and the fibers were exposed from the concrete frame and formed protruding. Next, as a result of applying the base mortar to the concrete skeleton, the fibers exposed from the concrete skeleton also entered the base mortar, and the adhesion between the concrete skeleton and the base mortar was strengthened. After the base mortar was applied, the finishing mortar was applied and the surface finishing layer was applied to complete the exterior work of the skeleton. In the obtained mortar-bonded wall, the concrete skeleton and the base mortar are firmly adhered to each other through the fibers, and the interface between the concrete skeleton and the base mortar does not separate even after one year has passed.

[0021]

EFFECTS OF THE INVENTION By utilizing the present invention, the base and the mortar are positively connected through the fiber reinforcing material, and the interfacial adhesive strength is improved. It is useful for applying mortar to concrete structures such as interior and exterior walls, ceilings and floors of buildings.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a procedure for constructing a mortar adhesion strengthening wall of the present invention.

[Explanation of symbols]

1: Base (concrete) 2: Mortar 3: Fiber reinforcement 4: Formwork 5: Adhesion enhancer

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) C04B 24/26 C04B 24/26 EG 24/38 24/38 AZ E04G 9/10 101 E04G 9/10 101A

Claims (14)

[Claims] 1. A concrete adhesion strengthening agent, characterized in that a fiber reinforcing material for a cement-based hardening material and a water-soluble adhesive are mixed. 2. A concrete adhesion strengthening agent, characterized in that a fiber reinforcing material for a cement-based hardening material and an alkali-soluble or alkali-decomposable adhesive are mixed. 3. The adhesive is one or more selected from starch, ethyl cellulose, carboxymethyl cellulose, polyvinyl alcohol, polyacrylic acid, acrylic resins such as acrylic acid or methacrylic acid, and sodium polystyrene sulfonate. 3. The concrete adhesion strengthening agent according to claim 1, wherein the compound is the main component. 4. The concrete adhesion reinforcing agent according to claim 1, wherein the fiber length of the fiber reinforcing material is 1 to 25 mm. 5. The single yarn fineness of the fiber reinforcing material is 4 to 80 dte.
It is x, The concrete adhesion strengthening agent in any one of Claims 1-4 characterized by the above-mentioned. 6. The concrete adhesion strengthening agent according to claim 1, wherein the fiber reinforcing material is a modified cross-section yarn. 7. The concrete adhesion strengthening agent according to claim 1, wherein the fiber reinforcing material is a polyamide-based reinforcing fiber. 8. The concrete adhesion enhancer according to claim 1, wherein the adhesive is liquid or paste. 9. The concrete adhesion strengthening agent according to claim 1, which is formed into a film shape. 10. The concrete adhesion strengthening agent according to claim 1, which is laminated on a release liner (also referred to as release paper). 11. A formwork panel, characterized in that the concrete adhesion enhancer according to any one of claims 1 to 10 is applied or laminated on a concrete molding surface. 12. A mortar adhesion-strengthening wall, characterized in that mortar is laminated on the surface of a concrete underlayer constructed by using the concrete adhesion-strengthening agent according to any one of claims 1 to 10. 13. A concrete form is coated or laminated on the inner surface thereof with the concrete adhesion enhancer according to any one of claims 1 to 10, concrete is poured into the form to be solidified and cured, the form is removed, and the surface thereof is removed. A mortar adhesion strengthening wall construction method, characterized in that mortar is applied to the mortar. 14. The amount of the fiber reinforcing material per 1 m ² of the substrate is 2 to
The mortar adhesion strengthening wall construction method according to claim 13, wherein the concrete adhesion strengthening agent is applied or laminated so as to have a weight of 30 g.