JP2691848B2 - Concrete lining material and lining method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to crack followability used in civil engineering structures such as concrete or mortar structures,
A new lining material with excellent waterproofness and integrity with the body,
And a concrete lining method using the same.

[0002]

2. Description of the Related Art As a lining method for waterproofing and anticorrosion for the purpose of protecting concrete or mortar structure from corrosive environment, urethane resin, epoxy resin, unsaturated polyester resin, vinyl ester resin, etc. are mainly used. The FRP lining method using a combination of a thermosetting resin and a fiber reinforcing material such as glass fiber is used. These waterproof and anticorrosion lining methods are FRP
Depending on the performance of the thermosetting resin used for
To form a lining layer with excellent salt barrier properties, scratch resistance, weather resistance, etc., or to use a thermosetting resin with poor extensibility, or to use a reinforcing material such as glass fiber with low extensibility When it is made of FRP (fiber reinforced plastic), the extensibility becomes very small.

On the other hand, structures for civil engineering and construction such as concrete and mortar undergo cracks on their surfaces because low-speed and high-speed contraction motions repeatedly occur due to dry contraction after construction, ground subsidence, earthquakes, and the like. When such a crack occurs, it causes the invasion of corrosive substances, and the invasion of water, the progress of destruction due to freezing, or the corrosion of reinforcing bars, steel frames, etc. in the durability of civil engineering structures such as concrete and mortar. The problem arises. The conventional FRP lining method with high rigidity cannot follow such cracks in the structure,
The FRP lining material was inevitably cracked and ruptured at the same time when the concrete cracked. In recent years, in order to deal with such a crack phenomenon, an FRP lining method in which a thermosetting resin having excellent extensibility and a fiber reinforcing material are combined has been tried.

For these FRP lining methods, a lining material has been proposed in which a thermosetting resin having excellent extensibility and a fiber reinforcing material are combined, but most of them use glass fiber as the fiber reinforcing material. . However, glass fiber is effective when rigidity is required, but since it is inferior in extensibility, the characteristic of the thermosetting resin having excellent extensibility is not utilized, and consequently it cannot follow cracks in concrete or the like. An FRP lining method in which a thermosetting resin having extensibility and a fiber reinforcing material having flexibility are combined has also been tried, but in general, the thickness of the lining layer is thin and the physical properties of the lining layer itself are inferior. Blisters, breaks, etc. have occurred.

[0005]

SUMMARY OF THE INVENTION The present invention provides a concrete lining material having elasticity, tensile strength and adhesive strength sufficient to withstand cracks and expansion / contraction motions in a building ground, and a concrete lining method using the same. For development purposes.

[0006]

Means for Solving the Problems The present inventor has realized that by using FRP as a concrete lining material in which a thermosetting resin having a certain physical condition and an organic fiber reinforcing material are combined, a concrete and mortar structure is obtained. In order to complete the present invention, we found a new lining material that is excellent in crack followability, waterproofness, and integrity with the structure frame when used in civil engineering buildings such as, and a concrete lining method using the same. It has come.

That is, according to the present invention, the fiber-reinforced plastic layer applied to a concrete or mortar structure for civil engineering construction has a strength per width of 1 cm of 15 kg / cm or more and a tensile elongation of 10% or more. Concrete lining material characterized by being a lining material composed of a resin and an organic fiber reinforcing material, and a thermosetting resin and an organic fiber reinforcing material after applying a primer in advance to a structure for construction of concrete or mortar for civil engineering The strength per 1 cm width of the fiber-reinforced plastic layer made of is 1
The above object was achieved by developing a lining method characterized by constructing a concrete lining material having a tensile elongation of 10% or more and 5 kg / cm or more.

Hereinafter, the present invention will be described in more detail. In the present invention, the strength of the fiber-reinforced plastic layer is determined according to JIS K
The tensile breaking load is determined by the test method specified in -7113 (the size of the No. 1 type test piece is the test piece), and this is divided by the width (unit cm) of the parallel part of the test piece to determine the The strength was determined (thus, even with the same composition, the strength increases in proportion to the thickness). This strength indicates the strength of the lining layer itself.

The thermosetting resin used in the present invention includes unsaturated polyester resin, vinyl ester resin, epoxy resin, acrylic resin and the like, and the resin casting has a tensile elongation of 10% or more. Is required
It is preferably at least 20%.

When the tensile elongation of the resin casting is less than 10%, the tensile elongation of the FRP obtained by combining the resin casting with the organic fiber reinforcing material is also 10% or less, lining the crack of the structure body. The material cannot be followed without breaking, resulting in fracture.

Examples of the organic fiber of the organic fiber reinforcing material used in the present invention include natural fibers, fibers such as polyamide, aramid, polyvinyl alcohol and polyester.
The tensile elongation of the fiber itself is 10% or more, preferably 20% or more. When the tensile elongation of the fiber itself is less than 10%, the tensile elongation of FRP obtained by combining the fiber with the thermosetting resin is also 10% or less, resulting in poor cradle followability of the skeleton and leading to fracture. In this case, synthetic fibers are practically suitable because they are superior in chemical resistance and microbial resistance.

The organic fiber reinforcing material may be used in the form of a non-woven fabric, a woven fabric, a knitted fabric or the like having a tensile elongation of 10% or more in consideration of sticking to a vertical surface, easy handling and uniformity. Necessary, especially non-woven fabric is excellent in price and practicality.

For example, when a polyester non-woven fabric is used as the organic fiber reinforcing material, in order to secure a strength of 15 kg / cm or more per 1 cm of FRP layer width, it varies depending on the type of thermosetting resin and the strength of polyester fiber. However, generally speaking, the minimum value is 130-
It seems that about 140 g / m ² is needed. If the basis weight is less than this, the strength of the FRP layer will be insufficient, and it is necessary to stack a plurality of sheets and use them.

As described above, the FR is obtained by combining the thermosetting resin having a tensile elongation rate of 10% or more as the cast material and the organic fiber reinforcing material as the fiber reinforcing material.
P, the strength per 1 cm width of the FRP layer is 1
It is an essential condition to have a performance of 5 kg / cm or more and a tensile elongation of 10% or more.

As a result of the tensile strength test of the FRP layer, 15 kg
If it is less than / cm, the FRP layer also cracks at the same time when cracks occur in the structure and the structure. The tensile elongation is 1
When the content is less than 0%, the FRP layer also cracks and breaks.

When the concrete lining material of the present invention is used for civil engineering construction such as concrete and mortar structures, lining is carried out as follows.

First, the surface of the skeleton is treated with sander or sandblast to expose a new surface of the structure skeleton, and then a primer is applied. The primer includes urethane type, epoxy type, acrylic type, vinyl ester type and the like, and is appropriately selected depending on the condition of the skeleton, the resin to be applied, the structural material to be applied, and the like.

After the primer is hardened, a concrete lining material is lined. The construction method is to put the organic fiber reinforcing material on the body or to fix it on the inclined surface, vertical surface etc. easily with resin etc. and then impregnate it with a hand-up method or spray-up method to cure it. . It is well known that a curing agent suitable for each resin is added to and mixed with the thermosetting resin immediately before the lining is applied.

The concrete lining material of the present invention may be used alone, but depending on the purpose, various coating materials may be used after the FRP lining.

That is, when weather resistance is required, a fluorine-based, acrylic urethane-based, or silicone-acrylic-based topcoat paint is applied, or when walking on a lining surface, silica sand or the like may be spread as a non-slip agent. . In addition, when high strength is required, FRP in which glass fiber and thermosetting resin are combined may be used for lining.

In this case, an organic fiber reinforcing material is added to the structure body.
The glass fiber-FRP applied on the FRP layer is different from the case where the glass fiber-FRP is directly applied on the frame because the stress due to the crack / rupture of the structure frame is absorbed by the organic fiber reinforcing material-FRP layer of the intermediate layer. can avoid.

The objects of the lining method using the concrete lining material of the present invention include roofs of buildings, rooftops, floors, balconies, water tanks, buried pipes, protective walls, etc. It can be used by taking advantage of the excellent performance of integration with.

[0023]

[Function] As the performance required for the lining material, it has waterproofness and corrosion resistance to protect it from a corrosive environment, has excellent adhesiveness with concrete or mortar structure, and the skeleton may be cracked for some reason. However, the lining material is required to have the performance of covering the body without cracking.

In order to prevent the lining material from breaking along with the cracks in the concrete, it is necessary that one or both sides of the cracks separate from the concrete at the same time that the concrete cracks occur. Because, if it is not peeled off, the elongation is from 0 span and the elongation rate in that case is required to be infinite, but there is no concrete lining material having such performance. If only a small portion on one side or both sides of the cracked portion peels off, infinite elongation is not required and the elongation rate of the lining material is expected.

The conditions specified in the present invention are that the adhesive has sufficient adhesive force, and if the stress is even stronger, it peels from the body and gradually spreads while spreading the stress generated at the time of crack generation, leading to cracking. It is speculated that it is not there.

The present invention will be described in more detail below with reference to Examples and Comparative Examples. In addition, part and% in an example mean a weight part and weight%, respectively.

[0027]

[Examples] FRPs of lining materials made of a combination of a thermosetting resin satisfying the conditions specified by the present invention with an organic fiber reinforcing material are defined as Examples 1 to 4, and linings made of combinations deviating from the conditions specified by the present invention. The following test was implemented using FRP of the material as Comparative Examples 1 to 4.

[Test Method] 1. Tensile Fracture Elongation Rate of Resin Cast Material Measured in accordance with JIS K 7113 tensile test method. 2. Elongation at break of reinforcing fiber It was measured according to JIS L 1085. 3. FRP Tensile Test According to JIS K 7113 Tensile Test Method, the test piece has a temperature of 20 ° C. and a pulling speed of 10 depending on the size of No. 1 type test piece.
The tensile breaking load at mm / min was determined, and the value was divided by the width (unit cm) of the parallel portion of the test piece to obtain the strength. The tensile elongation at break was determined as specified. 4. Peel test Cement mortar board (JIS A-5758; 1
00x70x20mm), one-sided urethane primer was applied as a primer on one side of this, dried, and then laminated with a lining material, and "Material" Vol.41, No.467,
pp1305-1310, Aug 1992; [Adhesive strength of concrete surface FRP lining Urakami, et al.] Measured using Shimadzu Autograph (AG-10TB) according to the test method described. However, the width of the test piece is 20 mm and the pulling speed is 50 mm /
Minutes. 5. Crack followability test Slate plate (JIS A-5403 S / flat plate) on the substrate
Using, the lining material was laminated with a width of 20 mm on the front and back surfaces treated with the above primer to prepare a test body. Using a Shimadzu Autograph (AG-10TB), the test piece was subjected to load-elongation curve measurement in the same manner as in the tensile test.

Example 1 Vinyl ester resin [lipoxy RM-101C, Showa Highpolymer Co., Ltd .; tensile elongation at break 100%] as thermosetting resin 100 parts 100 parts 2 parts benzoyl peroxide 50% solution 2 parts and dimethyl. FRP tensile test and peel test were conducted by mixing 0.5 part of aniline and using polyester non-woven fabric [Sontara 8100, Toray DuPont Co., Ltd .; tensile elongation at break 50% (PE-1)] as an organic fiber reinforcing material. went.

(Example 2) Vinyl ester resin [lipoxy FM-505, Showa Highpolymer Co., Ltd .; tensile elongation at break 60%] as a thermosetting resin, polyester nonwoven fabric [Posible AK-200, as an organic fiber reinforcing material] Asahi Chemical Industry Co., Ltd., tensile elongation at break 80% (PE-2)] was used, and the same composition and the same test as in Example 1 were performed.

(Example 3) An unsaturated polyester resin [Rigolac 50FBT, Showa Highpolymer Co., Ltd .; tensile elongation at break 50%] as a thermosetting resin was mixed with 100 parts of methyl ethyl ketone peroxide and 1 part of a polyester non-woven fabric. The same test as in Example 1 was performed using Possible AK-150, Asahi Chemical Industry Co., Ltd., tensile elongation at break 80% (PE-3).

Example 4 A thermosetting resin having the same composition as in Example 1 was mixed with a polyester nonwoven fabric [Spunbond E-D1].
070, Asahi Kasei Kogyo Co., Ltd. tensile elongation at break 20% (PE
-4)] was used to perform the same test as in Example 1.

Comparative Example 1 The same test as in Example 1 was conducted using the thermosetting resin and the polyester nonwoven fabric (PE-4) having the same composition as in Example 1.

(Comparative Examples 2 to 3) Thermosetting resin and glass fiber non-woven fabric having the same composition as in Example 1 [Chop Strand Mat # 450, Nitto Boseki; (GM-1)] and [Glass Cloth # 230]. , Nitobo Co., Ltd .; (GC-
1)] was used to perform the same test as in Example 1.

(Comparative Example 4) Vinyl ester resin as a thermosetting resin [Lipoxy RT-933, Showa Highpolymer Co., Ltd .; tensile elongation at break 9%] 100 parts methyl ethyl ketone peroxide 1 part, 6% -naphthenic acid The same test as in Example 1 was conducted using a polyester nonwoven fabric (PE-2) prepared by mixing 0.5 part of cobalt and 0.2 part of dimethylamylin. Table 1 shows the test results.

[0036]

[Table 1]

As shown in Table 1, the FRP layers of the lining materials obtained in Examples 1 to 4 satisfy the conditions specified in the present invention. In this case, the adhesive strength to concrete is excellent and cracks are not generated. In the follow-up test, it peeled off from the substrate against a stronger tensile stress, thereby showing a fracture elongation rate of 5 mm or more. Since the actual size of the cracks generated in concrete is about 0.1 to 1 mm, a fracture elongation of this level as a lining material is sufficient.

In Comparative Example 1, the number of the organic fiber nonwoven fabric used in Example 4 was one, so that the FRP layer as the lining material had no strength, so that it was broken before peeling.
In other words, when the strength is small because the FRP layer is thin, the strength of the FRP layer is 15 kg / cm by stacking several organic fiber nonwoven fabrics.
The above may be done.

Comparative Examples 2 and 3 are examples in which glass fibers are used, and since the fracture elongation rate as a lining material is small, they cannot follow the cracks and lead to fracture. In Comparative Example 4, since the elongation percentage of the thermosetting resin was small, the fracture elongation percentage as a lining material was small, and it was not possible to follow the crack and the fracture occurred.

[0040]

INDUSTRIAL APPLICABILITY The present invention uses a lining material having a FRP layer composed of a thermosetting resin and an organic fiber reinforcing material as a lining material, which has a tensile breaking strength of 15 kg / cm or more and a tensile breaking elongation of 10% or more. As a result, even when concrete or mortar structures, etc., have cracks in the skeleton due to drying, shrinkage, ground subsidence, etc., there is peeling of the lining with excellent adhesion and crack followability due to the excellent fracture elongation of the FRP layer. It is possible to construct a lining with excellent waterproofness and corrosion resistance without causing damage to the lining.

Claims (3)

(57) [Claims] 1. A fiber-reinforced plastic layer applied to a civil or mortar civil engineering structure has a width of 1
A concrete lining material having a strength per cm of 15 kg / cm or more and a tensile elongation of 10% or more, which is a lining material composed of a thermosetting resin and an organic fiber reinforcing material. 2. The concrete lining material according to claim 1, wherein each of the thermosetting resin and the organic fiber reinforcing material has a tensile elongation percentage of 10% or more. 3. A structure for civil engineering or construction of concrete or mortar, which has been preliminarily coated with a primer and then has a strength of 15 kg / cm or more per 1 cm width of a fiber reinforced plastic layer comprising a thermosetting resin and an organic fiber reinforcing material, A lining method characterized by constructing a concrete lining material having a tensile elongation of 10% or more.