KR20060093498A - Repair method of concrete structure using glass fiber mesh with hydrophile property - Google Patents

Abstract

Acrylic water-based emulsion and / or cement-based, water-soluble penetration enhancer with excellent penetration and adhesion in consideration of affinity with concrete structures to maintain high adhesion on both dry and wet surfaces and to achieve sufficient waterproof and repair reinforcement effects. Adhesive mortar with a binder alone or mixed is applied to the reinforcing reinforcement surface, and a hydrophilic glass fiber mesh is adhered to the surface on which the adhesive mortar is applied using adhesive mortar, and finishing materials such as cross-sectional recovery mortar and / or waterproof mortar It provides a repair method for the concrete structure using a hydrophilic glass fiber mesh including the process of coating.

Concrete, Repair, Reinforcement, Hydrophilic, Fiberglass Mesh, Mortar, Adhesive, Water Soluble, Acrylic, Waterproof

Description

Repair method of concrete structure using glass fiber mesh with hydrophile property

The present invention relates to a concrete structure repair method using a hydrophilic glass fiber mesh, and more particularly, to maximize the effect of the repair, reinforcement and waterproofing method and to improve the adhesion properties with deteriorated concrete, water-soluble penetration adhesion enhancer and hydrophilicity The present invention relates to a concrete structure repairing method using a hydrophilic glass fiber mesh that repairs and waterproofs a surface of a structure using a glass fiber mesh.

 In general, in the case of various civil engineering or building concrete structures such as bridges, stream restorations, sewage culverts and sewers, elevated roadways, pillars, walls, retaining walls, and rooftops of buildings, the surfaces deteriorate as the aging progresses. Occurs.

As described above, when damage or cracking occurs in the concrete structure, repair reinforcement work is performed on the corresponding portion using the repair reinforcement material.

Conventionally, adhesives of epoxy resins are used to bond carbon fibers and glass fibers to repair reinforcement sites, or glass fiber meshes or general dry bit meshes are bonded using a separate adhesive mortar to perform repair reinforcement.

However, the epoxy-based adhesive has excellent adhesion, but has a limitation that the concrete structure can be used only in a dry state, and there is a possibility of dropping in the interface layer due to a difference in thermal expansion coefficient due to a change in temperature and humidity with the concrete structure.

In addition, while concrete structures are alkaline, epoxy-based adhesives are acidic, which promotes neutralization at the interface.

In addition, when the glass fiber mesh or the dry beet mesh is bonded with adhesive mortar, there is a problem that the durability of the adhesive mortar itself is insufficient, and the overall thickness for repair reinforcement is about 30 to 50 mm thick, which may cause sagging due to its own weight. There is.

An object of the present invention is to solve the above problems, using a water-soluble penetration adhesion enhancer to maintain a high adhesion on both dry and wet surface and using a hydrophilic glass fiber mesh hydrophilic glass excellent waterproof and repair reinforcement effect To provide a concrete structure repair method using a fiber mesh.

Concrete structure repairing method using the hydrophilic glass fiber mesh of the present invention in consideration of the affinity with the concrete structure, the adhesive is made by combining alone or mixed acrylic aqueous emulsion and / or cement-based binder which is a water-soluble penetration adhesion enhancer excellent in penetration and adhesion Mortar is applied to the repair reinforcement surface or waterproof construction site, and the hydrophilic glass fiber mesh is adhered to the surface on which the adhesive mortar is applied using adhesive mortar, and a finishing material such as single-sided recovery mortar and / or waterproof mortar is applied thereon. This is done including the process.

And it is also possible to further include the step of applying a cross-sectional recovery mortar and / or waterproof mortar and then finishing the treatment with a cement-based or inorganic surface protective material.

The acrylic aqueous emulsion, which is a water-soluble penetration adhesion enhancer (WPB), is composed of fine particles having a particle size of about 0.1 μm or less.

The cement-based binder is made by mixing about 50 to 95% by weight of cement, about 3 to 30% by weight of a fine powder mixture, and about 2 to 20% by weight of artificial silica sand.

The cement-based binder may be further mixed with an acrylic or EVA-based emulsifying powder resin, if necessary.

In the above-mentioned fine powder mixture, metakaolin and silica fume are used alone or in combination.

The acrylic water-based emulsion emulsion and the cement-based binder, which are water-soluble penetration reinforcing agents, are supplied in a separated state in a two-part form, and are mixed and used in the field of repair reinforcement and waterproofing to make an adhesive mortar.

The acrylic aqueous emulsion, which is the water-soluble penetration adhesion enhancer, is provided in a liquid phase, and the cement-based binder is provided in powder form, so that the cement-based binder is mixed with the acrylic aqueous emulsion in the field to prepare an adhesive mortar.

The adhesive mortar is prepared by adding the acrylic aqueous emulsion at a ratio of about 5 to 45% by weight to the cement binder.

As the adhesive mortar, one of a cement-based binder or an acrylic aqueous emulsion may be selected and used alone.

The adhesive mortar prepared as described above maintains high adhesive strength in both the dry surface in which the repair reinforcement surface and the waterproof reinforcement surface are dry, and the wet surface in which moisture is present in the repair reinforcement surface and the waterproof reinforcement surface.

In addition, the adhesive mortar has a thermal expansion coefficient similar to that of a concrete structure that performs repair reinforcement and waterproofing, thereby being able to fundamentally block the risk of falling off at an interface.

The acrylic aqueous emulsion is excellent in compatibility with the cement-based binder, and improves the adhesion properties of the hydrophilic glass fiber mesh.

And the acrylic aqueous emulsion has the property of penetrating into the interior of the deteriorated concrete structure to strengthen the tissue.

The hydrophilic glass fiber mesh (GFM; Glass Fiber Mesh) strengthens the integration with finishing mortar or waterproof mortar, which is a finishing material, has excellent alkali resistance, and has flexibility to limit the shape of the repair reinforcement surface and the waterproof reinforcement surface. There is an advantage.

 In addition, the use of the hydrophilic glass fiber mesh, there is an effect of improving the durability, such as improving the bending toughness of the surface of the concrete structure, increase the crack resistance, improve the impact resistance, improve the freeze-thawing resistance.

Sectional recovery mortar or waterproof mortar, such as the finishing material is generally possible by applying a cross-sectional recovery mortar or waterproof mortar of various components used in repair and waterproof construction, detailed description thereof will be omitted.

As the surface protective material, it is preferable to use a material having properties such as surface durability improvement and neutralization suppression. For example, cement and / or inorganic surface protective coating materials may be used as the surface protective material.

Applying the surface protective material as described above, the surface is formed smoothly, the appearance is beautiful and the weather resistance is greatly increased.

According to the repair method of the concrete structure using the hydrophilic glass fiber mesh according to the present invention made as described above, by using the hydrophilic glass fiber mesh to improve the durability it is possible to form the thickness of the overall repair reinforcement layer and the waterproof layer of about 5 to 15mm Therefore, it is possible to reduce the material cost, and the effect of saving air due to the reduction in thickness is also obtained. Furthermore, in the case of high-rise buildings, it is possible to reduce the load of the structure, thereby making efficient repair reinforcement and waterproofing.

In the above, the thickness of the adhesive mortar and the hydrophilic glass fiber mesh is about 1 to 3 mm.

Next, the results of the strength and durability test for the repair reinforcement surface and the waterproof reinforcement surface formed by the preferred embodiment of the concrete structure repair method using a hydrophilic glass fiber mesh according to the present invention will be described.

Example 1

Adhesive mortar containing 60% by weight of cement-based binder and 40% by weight of acrylic aqueous emulsion, which is composed of 70% by weight of cement, 20% by weight of fine powder mixture, and 10% by weight of artificial silica sand. And a hydrophilic glass fiber mesh was adhered to the surface on which the adhesive mortar was applied using adhesive mortar, and a finish of the cross-sectional recovery mortar was applied thereto to form a thickness of the total repair reinforcement layer at 10 mm. After curing, it was maintained at room temperature to form Example 1.

Example 2

Adhesive mortar containing 60% by weight of cement-based binder and 40% by weight of acrylic aqueous emulsion, which is composed of 70% by weight of cement, 20% by weight of fine powder mixture, and 10% by weight of artificial silica sand. And the hydrophilic glass fiber mesh was adhered to the surface on which the adhesive mortar was applied using adhesive mortar, and the finish of the cross-sectional recovery mortar was applied thereon to form a thickness of the total repair reinforcement layer at 10 mm, and cured for 28 days. Then, Example 2 was formed by performing a total of 300 cycles by setting -18 ± 2 to 4 ± 2 ° C to 4 hours and 1 cycle as freeze-thawing conditions for durability check.

Example 3

A thickness of about 1 mm on the waterproof reinforcing surface of the concrete structure is a bonding mortar in which 60% by weight of cement-based binder and 40% by weight of an acrylic aqueous emulsion are mixed with 70% by weight of cement, 20% by weight of fine powder mixture, and 10% by weight of artificial silica sand. And a hydrophilic glass fiber mesh was adhered to the surface on which the adhesive mortar was applied using adhesive mortar, and a waterproof mortar finish was applied thereon to form a thickness of the entire waterproof reinforcement layer at 10 mm, and after 28 days of curing Example 3 was formed by maintaining at room temperature.

Example 4

Adhesive mortar mixed with 60% by weight cement-based binder and 40% by weight of acrylic water-based emulsion formed by mixing 70% by weight of cement, 20% by weight of fine powder mixture, and 10% by weight of artificial silica sand is about 1 mm on the waterproof reinforcing surface of the concrete structure. Apply to the thickness, the hydrophilic glass fiber mesh is adhered to the surface on which the adhesive mortar is applied using an adhesive mortar, and the finish of the waterproof mortar is applied thereon to form a thickness of the entire waterproof reinforcing layer to 10 mm, and curing for 28 days Then, Example 4 was formed by performing a total of 300 cycles by setting -18 ± 2 to 4 ± 2 ° C to 4 hours and 1 cycle as freeze-thawing conditions for durability check.

Comparative Example 1

Using epoxy-based adhesive, glass fiber is adhesively installed on the repair reinforcement surface of the concrete structure, and the finish repair mortar is coated on it to form a thickness of the repair water reinforcement layer as 30mm, and maintained at room temperature after 28 days of curing. Example 1 was formed.

Comparative Example 2

Using epoxy-based adhesive, glass fiber is adhesively installed on the repair reinforcement surface of the concrete structure, and the finish repair mortar is applied on it to form the thickness of the overall repair reinforcement layer as 30mm, and frozen for 28 days curing after curing. A total of 300 cycles were carried out by setting -18 ± 2 to 4 ± 2 ° C as 4 hours and 1 cycle as melting conditions to form Comparative Example 2.

Comparative Example 3

The glass fiber is adhesively installed on the waterproof reinforcement surface of the concrete structure using epoxy adhesive, and the waterproofing mortar finish is applied thereon to form the thickness of the entire waterproof reinforcement layer at 30 mm, and after curing for 28 days, the temperature is maintained at room temperature. 3 was formed.

[Comparative Example 4]

Using epoxy-based adhesive, the glass fiber is attached to the waterproof reinforcement surface of the concrete structure and the waterproof mortar finish is coated on it to form the thickness of the entire waterproof reinforcement layer as 30mm, and after 28 days curing, freeze-thawing for durability As a condition, -18 ± 2 to 4 ± 2 ° C was set to 4 hours and 1 cycle, and 300 cycles in total were carried out to form Comparative Example 4.

The compressive strength, the adhesion strength, the bending strength, the absorption resistance, the permeability resistance, the creep resistance, the impact resistance, the chloride ion penetration resistance, etc. were tested for Examples 1 to 4 and Comparative Examples 1 to 4 formed as described above. The results are shown in Table 1 and Table 2.

division Compressive strength (N / ㎡) Adhesion Strength (N / ㎡) Flexural strength (N / ㎡) Water Absorption Coefficient (kg / ㎡ · h0.5) Permeability (g) Example 1 640 3.4 13.5 0.05 1.50 Example 2 615 3.1 12.6 0.11 1.80 Example 3 315 1.52 2.9 0.15 0.08 Example 4 295 1.44 2.6 0.24 0.10 Comparative Example 1 550 2.6 9.0 0.10 2.00 Comparative Example 2 510 2.2 7.9 0.19 2.40 Comparative Example 3 290 1.25 2.5 0.21 0.12 Comparative Example 4 260 1.16 1.9 0.48 0.15

The compressive strength in the above is to evaluate the general physical performance, Example 1 and Example 2 and Comparative Example 1 and Comparative Example 2 coated with a cross-sectional recovery mortar was tested in accordance with KS F 4042, the waterproof mortar was applied Example 3 and Example 4, Comparative Example 3 and Comparative Example 4 were tested according to KS F 4918.

As can be seen from Table 1, it can be seen that Examples 1 to 4 have higher compressive strengths than Comparative Examples 1 to 4, respectively, and are 20N / mm 2 or more specified in KS F 4042. And 10 N / mm 2 or more specified in KS F 4918.

In the above, the adhesion strengths of Example 1 and Example 2 and Comparative Example 1 and Comparative Example 2 coated with the cross-sectional recovery mortar were tested according to KS F 4042, and the Example 3 and Example 4 and Comparative Example coated with waterproof mortar. 3 and Comparative Example 4 were tested according to KS F 4918.

As can be seen from Table 1, it can be seen that the adhesion strength of Examples 1 to 4 is higher than that of Comparative Examples 1 to 4, respectively, and is defined in KS F 4042 and KS F 4918. It satisfies 1.0N / mm <2> or more.

In the above, the flexural strength is an important factor to be considered in the renovation of the lower part of the bridge deck structure which is continuously subjected to the bending load, and the reinforcement or waterproofing of the lower part of the underground parking lot. The test was conducted according to KS F 4042. It showed better performance than the example, and in case of sectional recovery mortar, it satisfies more than 6.0 N / mm2 specified in KS F 4042.

Absorption resistance test in the above is to predict the freeze thaw, reinforcement corrosion, etc. due to the absorption of water, was carried out in accordance with KS F 2451 at 28 days of age, the water absorption coefficient was measured.

As can be seen from Table 1, Examples 1 to 4 were found to have a water absorption coefficient of about 50% lower than that of Comparative Examples 1 to 4, respectively, and were found to have excellent absorption resistance. When the restoration mortar is applied, it satisfies 0.5kg / ㎡ · h0.5 or less specified in KS F 4042, and when the waterproof mortar is applied, it satisfies 0.7kg / ㎡ · h0.5 or less specified in KS F 4925. .

In the above water permeability test, the size of the test specimen was molded into a diameter of 10 cm x 3 cm, demoulded after 48 hours, cured at a temperature of 20 ± 8 ° C. and humidity of 80% or more for 18 days, and after curing was completed. It was dried at 80 ° C. until a constant weight and tested according to KS F 4919 to measure the permeability.

As can be seen from Table 1, Examples 1 to 4 were found to have a low permeability compared to Comparative Examples 1 to 4, respectively, and were found to have excellent permeability resistance. In case of satisfying 20g or less specified in KS F 4042, and applying waterproof mortar, the water permeability ratio of 0.7 or less specified in KS F 4925 is satisfied.

 division  Surface condition Fall height of weight  Chloride Ion Penetration Resistance 1.0m 1.5m 2.0m Example 1 clear Good Good Good 750 Coulombs Example 3 clear Good Good Good clear Comparative Example 1 clear Slightly recessed Slightly recessed Slightly recessed 1,050 Coulombs Comparative Example 3 clear Partial destruction Partial destruction Partial destruction clear

 In the above, the cracking resistance is to confirm the occurrence of cracks on the surface layer. In accordance with KS F 4918, cracks on the surface of the test body cured up to 14 days at 20 ± 3 ° C. and 90 ± 5% of humidity are observed. It was evaluated by the presence or absence of the surface condition by evaluating, and as can be seen from Table 2, both the examples and the comparative examples were confirmed that there is no abnormality, satisfies the cracking resistance prescribed in KS F 4918.

In the above, impact resistance is an item for evaluating physical resistance to external force (impact, etc.), and it is evaluated by measuring the degree of damage of the surface layer by impact, and the base surface (width X length: 300mmX300mm, thickness 60mm) specified in JIS A 5304 Concrete plate) on the surface of the surface recovery mortar and waterproof mortar, and at least 1 hour at 20 ± 2 ℃ temperature after dropping the weight at the height of 1.0m, 1.5m, 2.0m respectively on the surface, reinforcement reinforcement surface and waterproof Evaluate the reinforcement surface for damage and evaluate

As can be seen from Table 2, in the case of Examples, it was found to be good, but in the case of Comparative Examples, depression and breakage were confirmed.

Chloride ion penetration resistance was tested in accordance with KS F 4930. When waterproof mortar was applied, it was immersed in a NaCl 2.5% aqueous solution specified in KS M 8115 for 7 days at a temperature of 20 ± 2 ℃, and dried at room temperature for 24 hours. Each section was divided into two sections and tested by spraying 0.1 N aqueous solution of silver nitrate, and in the case of section recovery mortar, by KS F 4042.

As can be seen from Table 2, in the case of cross-sectional recovery mortar, 1,000 Coulombs or less specified in KS F 4042 was satisfied, and in the case of waterproof mortar, it was confirmed that there is no abnormality. In Comparative Example 1, 1,050 Coulombs was found to be slightly out of the prescribed value.

As can be seen from Table 1 and Table 2 above, it was confirmed that the Examples according to the present invention had most of the performances superior to the Comparative Examples.

In the above description of the preferred embodiment of the concrete structure repair method using a hydrophilic glass fiber mesh according to the present invention, the present invention is not limited to this, and various modifications are carried out within the scope of the claims and the detailed description of the invention. It is possible and this also belongs to the scope of the present invention.

According to the concrete structure repair method using the hydrophilic glass fiber mesh according to the present invention made as described above, because it shows a high adhesion and excellent durability to the concrete surface to perform repair reinforcement and waterproofing, it is possible to extend the durability of the concrete structure It is possible to maintain sufficient strength.

In addition, according to the repair method of the concrete structure using the hydrophilic glass fiber mesh according to the present invention, since the adhesive mortar has a coefficient of thermal expansion similar to that of the existing concrete structure, there is a fear of dropping at the interface due to temperature and humidity changes even after a long time. none.

According to the repair method of the concrete structure using the hydrophilic glass fiber mesh according to the present invention, since the thickness of the repair reinforcement layer and the waterproof reinforcement layer can be significantly lower than that of the conventional method, the material cost can be reduced, and sag due to self weight It is possible to prevent.

In addition, according to the concrete structure repair method using the hydrophilic glass fiber mesh according to the present invention, since the hydrophilic glass fiber mesh is used, strength reinforcement, crack resistance, freeze-thawing resistance, and the like are improved.

Claims (7)

In consideration of affinity with concrete structures, an adhesive mortar mixed with an aqueous acrylic emulsion and cement-based binder, which is a water-soluble penetration enhancer having excellent penetration and adhesion, is applied to a repair reinforcement surface or a waterproof reinforcement surface, Attaching the hydrophilic glass fiber mesh to the surface on which the adhesive mortar is coated by using an adhesive mortar, Concrete structure repair method using a hydrophilic glass fiber mesh, including the step of applying a finish such as cross-sectional recovery mortar or waterproof mortar thereon. The method according to claim 1, Concrete structure repairing method using a hydrophilic glass fiber mesh further comprising the step of applying a single-sided recovery mortar or waterproof mortar and then finishing with a surface protective material. The method according to claim 2, The surface protection material as a concrete structure repair method using a hydrophilic glass fiber mesh using a cement or inorganic surface protection coating material. The method according to any one of claims 1 to 3, The acrylic aqueous emulsion is a concrete structure repair method using a hydrophilic glass fiber mesh composed of fine particles having a particle size of 0.1㎛ or less. The method according to claim 4, The cement-based binder is made by mixing 50 to 95% by weight of cement, 3 to 30% by weight of fine powder mixture, 2 to 20% by weight of artificial silica sand, As the high fine powder mixture, concrete structure repairing method using a hydrophilic glass fiber mesh which is used alone or mixed with metakaolin and silica fume. The method according to claim 5, The adhesive mortar is a concrete structure repair method using a hydrophilic glass fiber mesh manufactured by adding the acrylic aqueous emulsion in a ratio of 5 to 45% by weight to the cement binder. The method according to claim 6, The thickness of the overall repair reinforcement layer or waterproof reinforcement layer is 5-15 mm, The thickness of the adhesive mortar and the hydrophilic glass fiber mesh is 1 to 3mm concrete structure repair method using a hydrophilic glass fiber mesh to form.