JP2008087979A - Method for repairing alc structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a repairing process for an ALC (autoclaved light-weight concrete) in which not only shape recovery repair is performed but also high durability is imparted against rainwater infiltration, neutralization, salt damage, frost damage or the like being various causes of deteriorating an ALC structure. <P>SOLUTION: In the method for repairing an ALC structure, after the removal of a brittle part from a deteriorated ALC structure, a primer is applied on the ALC surface from which the brittle part is removed, next, light-weight mortar is applied thereto, and thereafter, a polymer cement based surface coating material is applied thereto. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a repair method for an ALC (lightweight aerated concrete) structure, and in particular, repairs of cross-sections or defects of various ALC structures deteriorated due to physical defects such as collision, neutralization, salt damage, frost damage, and the like. The present invention relates to a method for repairing an ALC structure having excellent durability when performing filling repair.

  In general, ALC is excellent in fire resistance, heat insulation, light weight and sound insulation, and its specific gravity is 1/4 to 3/4 of ordinary concrete (air-dry specific gravity 0.6 to 2.0). From the skyscrapers to ordinary houses, they are widely used as structural members for buildings such as partition walls, roofs, and floors, with the outer wall at the center.

  Since it is desirable that the material used for the repair / reinforcement method for such a concrete structure is as similar as possible to the mechanical properties of the material of the target concrete, cement-based materials are preferably used. Particularly in places where the usage environment is harsh, polymer cement-based materials are often used from the standpoint of integration with the substrate and suppression of penetration of harmful substances from the outside.

Specifically, ALC degradation includes physical defects due to collisions, etc., and cracks in ALC panel-related parts (openings, coping, joint sealing, surface finish (painting, etc.) due to long-term use. carbon dioxide rainwater and air, exhaust gas, such as NO _x and SO _x and the like intrudes into the panel, reinforcing bars inside the degradation and ALC panel ALC itself, the rusting of the fixing bracket are caused Te.
Although the reinforcing rebar is subjected antirust treatment, rainwater, gradually rust is promoted by the deterioration factor such as an exhaust gas such as carbon dioxide, NO _x and SO _x, and finally becomes a crack to the panel surface , Leading to a significant decrease in the durability of ALC.

  Conventionally, as a repair method of ALC, a method of removing a weakened weak layer and backfilling with a normal mortar or a lightweight mortar has been generally performed. Furthermore, after removing the fragile portion, the water-soluble silicate compound solution is applied and impregnated, or a moisture-curing urethane resin is impregnated, and then a light-weight mortar is applied and integrated to form a repair mortar and ALC substrate. A repairing method for improving the adhesion strength is proposed (Japanese Patent Laid-Open No. 1-219081).

These repair methods are effective methods for restoring the shape of the defect site, but do not improve the durability of the ALC structure.
In addition, there is an accident that the repaired part is peeled off from the mother body of the concrete structure, and the main cause of such peeling is that the mortar at the repaired part has adhesion to the base ALC. There are effects due to low temperature and environmental changes such as repeated temperature and humidity.
If these actions last for a long time, cracks may occur or the repaired parts may float or peel off, resulting in cracks that cause deterioration through water, carbon dioxide, exhaust gas, and chloride ions. Etc. are likely to enter, resulting in a problem that the durability of the repaired portion is impaired.

In addition, since a general concrete structure retains a highly alkaline environment for a long period of time with calcium hydroxide, which is a cement hydrate, a passive film is formed on the surface of the reinforcing bar, which is protected from steel corrosion. Yes.
However, although the ALC structure is composed of ALC panels manufactured at the factory, the hydration process of the ALC panel is different from the usual cement hydration reaction, and quartz fine powder or the like is added as a silica source, In order to perform high temperature and high pressure autoclave curing, unlike ordinary concrete, the inside of ALC is in a weakly alkaline to neutral region, and as it is, the resistance to steel corrosion is low.
The steel material itself is protected by rust prevention treatment, but when deterioration occurs due to the cause of deterioration as described above, it is difficult to specify the deterioration range, and the weak part as seen in conventional repair methods. In the case of no-hulling and uneven mortar filling, it is not a fundamentally effective repair method that imparts durability to the parts exposed to the deteriorated environment.
Accordingly, it has been desired to develop a repairing method for an ALC structure that is excellent in durability and sufficiently satisfactory.
Japanese Patent Laid-Open No. 1-219081

An object of the present invention is not limited to mere shape recovery repair, rain water entering a variety of degradation causes the relative ALC structure, neutralized by the exhaust gas of carbon dioxide, NO _x and SO _x in the air, salt damage, frost It is to provide a repair method for an ALC structure that imparts high durability to the above.

In repairing the ALC structure, the present inventors removed the deteriorated portion or the fragile portion, applied a primer to the ALC surface, repaired by filling, and then applying a polymer cement surface coating material. The present invention has been made by finding that the durability of the portion is improved.
That is, in the repair method of the ALC structure according to claim 1 of the present invention, after removing the weak part from the deteriorated ALC structure, the primer is applied to the ALC surface from which the weak part has been removed, and then the lightweight mortar is applied. Then, a polymer cement surface coating material is applied, and the ALC structure is repaired.

The repair method for an ALC structure according to claim 2 is the repair method for an ALC structure according to claim 1, wherein the primer is a polymer dispersion made of an acrylate ester. is there.
The method for repairing an ALC structure according to claim 3 is the method for repairing an ALC structure according to claim 1 or 2, wherein the lightweight mortar has a unit volume mass (kg / L) of 0.8 to 1.5. The repair method is characterized by having an absolute dryness specific gravity of 0.6 to 1.3.
The method for repairing an ALC structure according to claim 4 is the method for repairing an ALC structure according to any one of claims 1 to 3, wherein the polymer cement-based surface coating material has a glass transition temperature of -20 ° C or lower. A method for repairing an ALC structure characterized in that an acrylic polymer dispersion for cement admixture is blended so that the polymer solid content / cement (mass ratio) is 60 to 150%.

  According to the repair method of the ALC structure of the present invention, the adhesion between the ALC structure and the repaired portion is also good, and further, high durability such as water permeability, neutralization resistance, and salt barrier properties after curing. It is possible to maintain the shape recovery repair effect for a long period of time.

The present invention is illustrated by the following best mode examples, but is not limited thereto.
In the repair method of the ALC structure of the present invention, after removing the fragile portion from the deteriorated ALC structure, a primer is applied to the ALC surface from which the fragile portion has been removed, and then a lightweight mortar is applied, and then the surface of the polymer cement system A method of repairing an ALC structure characterized by applying a covering material.

In the repair method of the present invention, for example, a primer is applied to the ALC surface of a part where the deteriorated part of the ALC structure is picked up or a defective part.
Such a primer has an effect of improving the adhesion between the lightweight mortar to be filled and the ALC main body, and is not particularly limited, and any commercially available one can be used as long as the effect of the present invention is not impaired. Preferable examples include Lion Bond A (polymer solid content 45%) or aqueous treat (polymer solid content 22%) manufactured by Sumitomo Osaka Cement.
Among them, a polymer dispersion composed of an acrylate ester is particularly preferably used from the viewpoints of permeability to an ALC substrate and adhesion.
The coating amount is not a problem as long as it is a coating amount usually practiced by those skilled in the art, and generally 10 to 100 g / m ² in terms of polymer solid content is a normal coating amount.

Next, after the primer is dried to form a film, a light-weight mortar is filled on the replenishment site on the primer.
The lightweight mortar used in the present invention preferably has a unit volume mass (kg / L) of 0.8 to 1.5, preferably 0.85 to 1.10.
By setting the unit volume mass (kg / L) of the lightweight mortar to the above range, properties such as strength, thermal conductivity, thermal expansion coefficient, etc., in which the physical properties of the mortar layer in the absolutely dry state described later approximate that of an ALC panel structure are provided. This is because it becomes more stable after integration.
Furthermore, if the unit volume mass is less than 0.8, the strength expression of the repair mortar is not sufficient and may not be suitable for use in repairing the ALC structure.
Further, when the unit volume mass exceeds 1.5, the physical properties are greatly different from those of the ALC panel structure, and stability at the repair interface may be a problem.

The specific gravity of the dry mortar is suitably 0.6 to 1.3, preferably 0.70 to 1.0. The absolute dry specific gravity means that the mortar repair material is 4 × 4 × 16 cm. This is a value obtained by measuring the bulk specific gravity of the mortar in the dry state (absolute dry bulk specific gravity) after molding into a mold and curing for 28 days and drying at 105 ± 5 ° C. until the weight loss is eliminated.
When the absolute dry specific gravity is in the above range, the physical properties of the mortar layer after curing are comparable to the properties such as strength, thermal conductivity, and thermal expansion coefficient similar to those of the ALC panel structure, and are more stable after integration. Because it becomes the target.

The lightweight mortar used in the present invention is a mixture of raw materials such as cement, resin, lightweight aggregate and water and, if necessary, a thickener, thixotropic agent, shrinkage reducing agent, antifoaming agent, curing retarder, and expansion agent. It can be produced by kneading an additive (additive) and general aggregate.
The kneading method is not particularly limited, and a part of the materials may be mixed and used in advance, or all materials may be mixed at the site at once.

Cement can be selected in consideration of on-site construction conditions and the like, and is not particularly limited. For example, various portland cements such as normal, early strength, medium heat and super early strength, and fly to these various portland cements. Various mixed cements and fast-hardening cements mixed with ash or blast furnace slag can be used alone or in combination of two or more.
In particular, it is preferable to use early-strength cement because it is inexpensive and exhibits early strength.

Also, the cement includes blast furnace slag powder, fly ash, silica fume, limestone fine powder, quartz fine powder, dihydrate gypsum, hemihydrate gypsum, anhydrous gypsum, quick lime-based expansion material, calcium sulfoaluminate-based expansion material, etc. These known admixtures can be added.
The blending ratio is not particularly limited and can be appropriately designed. In particular, the calcium sulfoaluminate-based expansion material is preferably 5 to 20 parts by mass with respect to 100 parts by mass of cement, and this is a self-shrinkage. This is because it becomes easy to suppress excessive expansion and prevent excessive expansion.

  The resin that can be used in the lightweight mortar of the present invention is not particularly limited, and a known resin can be used. In particular, a polymer dispersion for cement admixture and / or a re-emulsifying powder resin specified in JIS A 6203 is used. Is preferred.

As the polymer dispersion for cement admixture and / or the re-emulsified powder resin, a liquid resin emulsion, a polymer dispersion of rubber latex, a powdered re-emulsified powder resin, or the like can be used.
As the polymer dispersion for cement admixture and / or the re-emulsifying powder resin, those specified in JIS A 6203 can be used, for example, polyacrylate, styrene butadiene, ethylene vinyl acetate, vinyl acetate. Resin such as vinyl acetate / versacic acid vinyl and vinyl acetate / vinyl vinyl versacate / acrylic acid ester, and the like, which can be appropriately selected from these and used alone or in combination.
In particular, when using a re-emulsified powder resin, there is no need for on-site weighing, and quality control becomes easy.
Preferably, an acrylic polymer can be used, and it is preferable from the viewpoint of durability to use a dispersion of such an acrylic polymer and / or a re-emulsified powder resin.

The re-emulsified powder resin is a powder resin obtained by spray-drying a polymer dispersion specified in JIS A 6203 and re-emulsified when water is added. The polymer dispersion is a dispersion of the above-mentioned polymer fine particles in water. It is in a floating state.
Methods for stabilizing the polymer include, for example, a carboxyl method (anionization method) for copolymerizing acrylic acid, a protective colloid method for polymerizing in an aqueous solution of a water-soluble polymer such as polyvinyl alcohol, and a polymerization reactive surfactant. There are a copolymerization method and a stabilization method using a non-polymerization reactive surfactant.
The method for producing such a re-emulsified powder resin is not particularly limited, and these polymer dispersions can be prepared using any known method such as a powdering method or an anti-blocking method.
As the re-emulsified liquid of the polymer dispersion and / or the re-emulsified powder resin, it is desirable that the minimum film forming temperature is 5 ° C. or less.
When the minimum film-forming temperature is 5 ° C. or less, the adhesion with ALC is excellent, and the curability at a low temperature is particularly excellent.

The blending amount of the polymer dispersion and / or the re-emulsifying powder resin is such that the polymer solid content / cement ratio in the mortar is 0.5 to 20%, preferably 1 to 10% in terms of mass ratio. desirable.
This is because, by mixing the polymer at such a blending ratio, it has good adhesion to ALC.
If the polymer is less than 0.5% by mass with respect to the cement, the adhesion performance with ALC cannot be sufficiently exerted, and if it exceeds 20% by mass, the flowability and strength of the mortar decrease, and the cross section of the ALC structure This is because there is a possibility that the performance as a restoration or thickening material may be hindered.

  Further, the lightweight aggregate used in the lightweight mortar of the present invention is not particularly limited, and a general artificial lightweight aggregate can be used. In particular, the apparent unit volume mass (kg / L) of the lightweight aggregate is 0.00. It is desirable to use one having a ratio of 08 to 0.80, preferably 0.18 to 0.80. For example, FUYOLITE No. 1, No. 2, No. 2, No. 3, or a mixture thereof manufactured by Sakai Perlite Co., Ltd. Etc.

Further, as general aggregate, river sand, sea sand, mountain sand, crushed sand, No. 3-8 silica sand, limestone, slag fine aggregate, etc. can be used, and fine powder and coarse aggregate are not included. It is preferable to use fine aggregates such as silica sand and limestone whose particle size is adjusted.
At that time, the unit volume mass of the freshly kneaded light weight mortar is 0.8 to 1.5, and the absolute dryness specific gravity of the light weight mortar after curing is adjusted to be in the range of 0.6 to 1.3. It is important to use by adjusting the blending ratio.

  In the lightweight mortar of the present invention, in addition to the above materials, additives such as a setting retarder, a curing accelerator, a thickener, an antifoaming agent, a foaming agent, a rust inhibitor, a defrosting agent, a colorant, and a water retention agent are added. The present invention can be used within a range that does not substantially impair the object of the present invention.

The lightweight mortar of the present invention is kneaded by adding an appropriate amount of water. If the water does not contain a component that adversely affects the hardening of cement or the like, water such as tap water, ground water, or river water can be used. For example, those suitable for “JIS A 5308 Appendix 9 Water used for mixing ready mixed concrete” are preferable.
Further, the amount of water to be blended can be changed depending on the type and blending of the materials to be used, and therefore is not uniquely determined, but usually 20 to 50% by mass in the water / powder ratio. Particularly preferred is 25 to 40% by mass.
When water is already included in the compounding material such as the polymer dispersion, the water is also included.
By blending water in such a range, sufficient workability and sufficient strength development will be obtained.

  The light weight mortar of the present invention may be mixed at the time of construction or a part of it may be mixed in advance, but it is possible to mix a material mixed with a powder component in advance with water at the construction site. This is preferable in that it eliminates the measurement labor and measurement errors.

Next, in the repair method of the ALC structure according to the present invention, the light weight mortar is applied, and then the polymer cement-based surface coating material is applied, and is cured and cured.
After the lightweight mortar is sufficiently cured, a polymer cement surface coating material is applied on the lightweight mortar.
The polymer cement-based surface covering material used in the present invention includes raw materials such as cement, resin, and water, and general aggregates (fine aggregates) such as silica sand and limestone sand as necessary, limestone powder, blast furnace slag fine powder, It can be produced by kneading admixtures such as fly ash and admixtures (additives) such as thickeners, antifoaming agents, and coloring agents.
The kneading method is not particularly limited, and a part of the materials may be mixed and used in advance, or all materials may be mixed at the site at once.

The cement can be selected in consideration of on-site construction conditions and the like, and is not particularly limited. For example, the cement may be selected from the same materials as those used for the above-described lightweight mortar.
Moreover, the well-known admixture and fine aggregate similar to what is used for the above-mentioned lightweight mortar can be added to this cement.
The blending ratio is not particularly limited and can be appropriately designed. For example, the total amount of the admixture and the fine aggregate can be 60 to 150 parts by mass with respect to 100 parts by mass of cement.

The resin that can be used for the polymer cement-based surface coating material used in the present invention preferably has a glass transition temperature (Tg) of −20 ° C. or lower.
As the resin, known ones similar to those used for the above-mentioned lightweight mortar can be used, but those used for the polymer cement-based surface coating material require sufficient crack followability and are used for the lightweight mortar. It is preferable to select a glass transition temperature (Tg) lower than that of the polymer, and it is particularly preferable to use an acrylic resin polymer dispersion.

The blending ratio is not particularly limited and can be appropriately designed, but is preferably 60 to 150 parts by mass as a polymer solid content with respect to 100 parts by mass of cement.
An acrylic polymer dispersion having a glass transition temperature of −20 ° C. or lower is added in an amount of 60 to 150 parts by mass in terms of polymer solid content with respect to 100 parts by mass of cement. Excellent adhesion to the above lightweight mortars. In general areas, exhaust gas such as carbon dioxide, oxygen, NO _x , SO _{x in} the air, water, deterioration of ALC or ALC repair materials such as chloride ions in coastal areas Excellent ability to shield factors.
In addition, the polymer cement-based film after drying becomes rich in flexibility, and even if a crack occurs in the ALC or ALC repair material, it follows the crack and shields deterioration factors from the outside.

Furthermore, water is mixed in the polymer cement-based surface coating material of the present invention. For example, it may be mixed in the same manner as in the case of mixing with the aforementioned light weight mortar.
Moreover, general aggregates (fine aggregates) such as silica sand and limestone sand, admixtures such as limestone powder, blast furnace slag fine powder, fly ash and the like, which are added to the polymer cement surface coating material of the present invention as necessary, In addition, admixtures (additives) such as thickeners, antifoaming agents, and colorants may be added in an appropriate amount.

  In the polymer cement-based surface coating material of the present invention, in addition to the above materials, a setting retarder, a curing accelerator, a thickener, an antifoaming agent, a foaming agent, a rust inhibitor, a defrosting agent, a colorant, a water retention agent, and the like These additives can be used as long as the object of the present invention is not substantially impaired.

  The construction thickness of the polymer cement-based surface coating material is not particularly limited, and can be determined by the thickness to be repaired and increased, but is usually 0.5 mm to 3 mm, preferably 1 mm to 2 mm. .

  In addition, the ratio (composition) of each component used in the present invention can vary depending on the purpose of use, the use site, cost effectiveness, etc., and the amount of moisture takes into consideration the construction form, bone material, workability, durability, etc. The moisture content is used in consideration of the construction form and construction properties, and is not limited.

Materials Used The present invention will be described in detail by the following examples, comparative examples and test examples.
Portland cement Sumitomo Osaka Cement Co., Ltd. Limestone powder LP-200 Omi Mining Co., Ltd.
Powdered resin Vinyl acetate / versacic acid vinyl ester / acrylic ester re-emulsified form
Powder resin; Trade name Mobilis DM2072P (minimum film-forming temperature 0 ° C) Nichigo
-Moly Vinyl Co., Ltd. Lightweight Aggregate Fuyolite
Silica sand 6 Asari 6 Miku Shipping Co., Ltd.
Thickener Marporose M-4000 Matsumoto Yushi Seiyaku Co., Ltd.
ALC material Sipolex Sumitomo Metal Mining Sipolex Co., Ltd.
Primer Acrylic ester resin polymer dispersion; Product name Sumitomo Osaka Se
3-fold diluted solution of Ment's Lion Bond A (minimum film-forming temperature 1 ° C, polymer solid content 45%)

Preparation of lightweight mortar At the mixing ratio shown in Table 1, Portland cement, limestone powder, lightweight aggregate, powder resin, silica sand No. 6, thickener and water are mixed and stirred to prepare each mortar repair material of Formulations 1 to 4. Obtained.
However, the water / powder ratio powder in Table 1 is a powder in which used Portland cement, limestone powder, powder resin, lightweight aggregate, silica sand No. 6, and raw materials corresponding to thickeners are mixed. Yes, the water / powder ratio represents the amount of water added in mass% when the raw material powder is taken as 100.
Moreover, unit volume mass is the value which showed the mass of each obtained lightweight mortar by kg / L.

Physical property test Each light weight mortar obtained was subjected to the following tests, and the results of measuring the physical properties are also shown in Table 1 above.
For reference, the physical properties of the ALC matrix to be repaired are also shown in Table 1.
Each dry mortar obtained above was molded into a 4 × 4 × 16 cm mold, cured for 28 days, dried at 105 ± 5 ° C. until there was no weight loss, The bulk specific gravity of each mortar was measured (absolute dry bulk specific gravity).

Bending strength / compressive strength The bending strength and compressive strength after 28 days of age of the 4 × 4 × 16 cm specimen obtained by placing each light weight mortar repair material obtained above are based on JIS R 5201. And measured.

Tensile strength The split tensile strength after 28 days of age of a specimen of φ10 × 20 cm obtained by placing each lightweight mortar was measured according to JIS A1113.

At an adhesion strength temperature of 20 ° C. and 65% RH, a primer (acrylic ester resin-based polymer dispersion, trade name: Lion Bond A 3-fold diluted solution manufactured by Sumitomo Osaka Cement Co., Ltd.) is 200 g / m ² (polymer solid). 30 g / m ² ), and after 30-60 minutes, each lightweight mortar repair material obtained above is placed and cured at 20 ° C. and 65% RH. The adhesive strength was measured at a material age of 7 days.
However, the lightweight mortar of Formulation Example 4 was directly applied to the ALC plate without applying a primer.
The adhesion strength was determined according to an adhesion strength test using a building laboratory type tensile tester.

Thermal conductivity The thermal conductivity after 28 days of age of a 10 × 10 × 2 cm specimen obtained by placing each lightweight mortar repair material obtained above was measured according to ASTM C518.

The coefficient of thermal expansion after the test in the following length change rate test was stored in a constant temperature bath at 60 ° C. until it reached a constant weight, and then the test sample was taken out and quickly accord- ing to JIS A 1129 in a constant temperature room at 20 ° C. The length was measured. Next, the specimen is taken out in a thermostatic bath at −20 ° C. for 24 hours or more until the length becomes constant, and the length is quickly measured according to JIS A 1129 in a constant temperature room at 20 ° C. The coefficient of thermal expansion was calculated from the difference in length of 20 ° C.

Length change rate Each lightweight mortar repair material obtained above was molded according to JIS R 5201, 4 × 4 × 16 cm test piece was removed after 24 hours, and the base length was measured according to JIS A 1129. Was measured.
After measuring the base length, it was stored in a constant temperature room at 20 ° C. and 60% RH, and the length change rate after 28 days was measured according to JIS A 1129.

In the crack resistance test at 20 ° C. and 60% RH, each of the light weight mortar repair materials obtained above was applied to the ALC plate at a thickness of 60 × 25 × 0.5 cm and cured at 20 ° C. and 60% RH. The cracking state was visually observed after 3 months of age.
○ ・ ・ ・ No cracking × ・ ・ ・ Cracking occurred

  From Table 1 above, it can be seen that in Formulation 4, there is a large difference from the ALC physical properties, a difference occurs in the behavior after integration, and there is a problem in stability.

Example 1, Comparative Example 1 and Comparative Example 2
Repair method After applying primer (acrylic ester resin, product name: Lion Bond A3 dilution diluted by Sumitomo Osaka Cement Co., Ltd.) at a rate of 200 g / m ² evenly and thinly after 30 to 60 minutes and drying, The lightweight mortar repair material of Formula 1 obtained above was placed.
One day after placing the lightweight mortar, the polymer cement-based surface coating material was uniformly applied at 1.2 kg / m ² , and this was cured at 20 ° C. and 65% RH for 28 days. The ALC structure of Example 1 Got the body.
Moreover, the ALC structure of Comparative Example 1 was obtained by omitting the application of the polymer cement-based surface coating material in Example 1.
Further, the ALC plate itself was used as the ALC structure of Comparative Example 2.

The ALC structures of Example 1, Comparative Example 1 and Comparative Example 2 were subjected to a neutralization resistance and salt barrier test in a test period of 28 days, and a water permeation test in a test period of 7 days. Evaluation of water permeability, neutralization resistance, and salt barrier properties was performed, and the results are shown in Table 2.
However, the following were used as the polymer cement surface covering material.
Polymer cement surface coating material: Rexcoat 5200 manufactured by Sumitomo Osaka Cement Co., Ltd. (surface of polymer solid content / cement (mass ratio) 60% using acrylate resin polymer dispersion with glass transition temperature of -25 ° C Coating material)

In Table 2, the durability was evaluated by the following method.
Accelerated neutralization: Executed according to JIS A 1171.
Permeability; Durability carried out according to JIS A 1404; ○: Extremely excellent in durability compared to ALC material Δ: Slightly excellent in durability compared to ALC material ×: Durability of ALC material Or equivalent durability

The repair method of the ALC structure according to the present invention is used for repairing defective portions of ALC panel-related parts (openings, coping, joint sealing, surface finishing (painting, etc.), and to the ALC structure in the field of construction and civil engineering. It can be widely used for repair.

Claims (4)

After removing the fragile part from the deteriorated ALC structure, a primer is applied to the ALC surface from which the fragile part has been removed, and then a lightweight mortar is applied, and then a polymer cement-based surface coating material is applied. Repair method of ALC structure. The method for repairing an ALC structure according to claim 1, wherein the primer is a polymer dispersion made of an acrylate ester. The repair method of the ALC structure according to claim 1 or 2, wherein the lightweight mortar has a unit volume mass (kg / L) of 0.8 to 1.5 and an absolute dryness specific gravity of 0.6 to 1.3. A method for repairing an ALC structure, characterized by comprising: The method for repairing an ALC structure according to any one of claims 1 to 3, wherein the polymer cement-based surface coating material is a polymer solid content / acrylic polymer dispersion for cement admixture having a glass transition temperature of -20 ° C or lower. A method for repairing an ALC structure, wherein the cement (mass ratio) is mixed so as to be 60 to 150%.