JP2913275B2 - Hybrid exterior wall repair method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a renovation method applicable to reinforced concrete buildings and structural members, and includes precast concrete structures, block structures, stone structures, brick structures, ALCs, as well as reinforced concrete structures cast in place.
TECHNICAL FIELD The present invention relates to a method for repairing a hybrid outer wall that can be applied to deterioration of a skeleton and a finish of a building structure such as a structure. More specifically, a hybrid exterior wall repair method that can simultaneously repair structural cracks, progress of neutralization, corrosion of steel bars, surface deterioration, etc., prevent finish spalling, and enhance the protection of the framework by adding a new surface finishing layer. To provide.

[0002]

2. Description of the Related Art An inorganic hardened material in which a corrosive metal material such as reinforced concrete is embedded, when rust is generated on the corrosive metal material due to intrusion of rainwater or the like, a crack is generated in the hardened inorganic material due to its volume expansion, Or crush. Especially,
When a high concentration of chlorine ions is mixed in the inorganic cured product, the corrosive metal material corrodes relatively easily. On the other hand, even if the corrosive metal material is not embedded, the surface layer of the hardened inorganic material may fall off due to external force such as shrinkage due to temperature change and dry / wet or an earthquake, etc., causing an accident or exposing the internal skeleton. Deterioration may be accelerated.

Hitherto, various methods have been proposed to prevent the above-described cracking and crushing of the inorganic cured product, and the peeling of the surface layer, and some excellent partial prescriptions have been proposed. However, none of them have high practicality and are totally satisfactory.

[0004]

Therefore, it is possible to prevent all of the above-mentioned problems such as crack generation and crushing of the inorganic hardened material and peeling of the surface layer over a long period of time. It can be widely applied not only to construction, but also to deterioration of the frame and finish of building structures such as precast concrete, block, stone, brick, ALC, etc., ensuring the reliability of construction and reducing the amount of waste material on site It was hoped that a renovation method that would make it work.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been proposed in view of the above, and in a modified portion of an inorganic cured product, 0.5-10% by weight of an isocyanate group and a hydrolyzable silane group (a silicon atom After applying a one-component curable resin composition containing 0.4 to 7.5% by weight of a polymer having a molecular weight of 3000 to 50,000 as a main component and / or a moisture-permeable polymer cement paste, The part where the defect is generated is filled with the mortar composition for undercoating shown in the following, and the part where the floating is generated is a bar-shaped or bent part of the hairpin-shaped bifurcated shaft having flexibility. A bifurcated shaft is inserted into the insertion hole formed in the thickness direction, and the anti-separation connecting member formed by loosely fitting and connecting the annular locking member is locked in the groove formed in the vertical direction. Insert the member and A mesh for fixing the mercement paste or the epoxy adhesive in a state of being filled in the insertion hole and the groove, and then applying an intermediate mortar composition mixed with a synthetic resin to the entire repaired portion and reinforcing the inorganic cured product. The present invention relates to a method for repairing a hybrid outer wall, characterized in that after embedding a mesh material by spotting and pressing a material, a mortar composition for overcoating having moisture permeability shown below is applied. is there.

The following can be used as the undercoat mortar composition. A mortar composition comprising a porous aggregate in which a rust inhibitor or an alkali metal salt is incorporated, and an aggregate whose surface is coated with cement. Particle size 0.06-5mm, air dry bulk specific gravity 0.1-1.5,
A mortar composition comprising a porous aggregate having a water absorption of 15 to 500 wt%. Particle size 0.06-5mm, air dry bulk specific gravity 0.1-1.5,
A mortar composition in which a rust inhibitor or an alkali metal salt is incorporated in a porous aggregate having a water absorption of 15 to 500 wt%, and an aggregate whose surface is coated with cement is mixed. The following or a combination of the following can be used as appropriate as the mortar composition for overcoating. Mortar composition mixed with synthetic resin. A mortar composition containing an inorganic waterproofing agent containing SiO ₂ as a main component. (=) Particle size 0.06-5mm, air-dry bulk specific gravity 0.1-
1.5, a mortar composition containing a porous aggregate having a water absorption of 15 to 500 wt%. (=) A mortar composition comprising a porous aggregate in which a rust inhibitor or an alkali metal salt is incorporated, and an aggregate whose surface is coated with cement. (=) Particle size 0.06-5mm, air-dry bulk specific gravity 0.1-
1.5, a mortar composition comprising a porous aggregate having a water absorption of 15 to 500 wt%, in which an rust inhibitor or an alkali metal salt is incorporated, and an aggregate whose surface is coated with cement is mixed.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The porous aggregate in the undercoat mortar composition and the overcoat mortar composition may be any as long as it has fine pores and has a water absorbing property. Absent. Therefore, not only the inorganic aggregate but also an organic foam aggregate such as an ethylene-vinyl acetate foam aggregate may be used as the porous aggregate. However, by using a porous aggregate having a particle size and air-dry bulk density, water absorption as shown below,
The workability of the iron coating of the mortar composition containing the compound can be improved, and the water permeability of the obtained inorganic cured product (layer) can be reduced, and the moisture permeability can be improved. That is, the particle size is from 0.06 to
5 mm, more preferably in the range of 0.1 to 2.5 mm may be used. The air-dried bulk specific gravity is 0.1-1.
Five may be used. When it is 1.5 or more, the impregnating and adsorbing ability of the rust preventive decreases, and the moisture permeability of the obtained cured inorganic material (layer) decreases. Also, when it becomes 0.1 or less,
The strength of the resulting cured inorganic material (layer) is reduced, and the water permeability and water absorption are undesirably increased. Further, the water absorption may be 15 to 500 wt%. 500wt
% Or more, the impregnating and adsorbing ability of the rust inhibitor and the alkali metal salt is increased, but the strength of the obtained cured inorganic material (layer) is lowered, and water permeability and water absorption are undesirably increased. When the content is less than 15 wt%, the ability to impregnate and adsorb the rust inhibitor and the alkali metal salt decreases, and the moisture permeability of the obtained cured inorganic material (layer) decreases.

[0008] the above-mentioned air-dried bulk specific gravity, as the porous aggregate water absorption, natural zeolite (mordenite, clinoptilolite, xM (2 / n) O · Al 2 O 3 · ySiO 2
・ ZH ₂ O) crushed granules, granules, granulated pellets,
Granulated granules, allophane (Allophane, natural silica alumina gel, Al ₂ O ₃ .mSiO ₂ .nH ₂ O + Al
(OH) ₃ ) Granules, granules, diatomaceous earth granulated and fired particles, or tuff-based natural glass fired products, rhyolite-based natural glass pumice, crushed calcium silicate particles, foamed glass particles, refractory brick crushed particles, ALC crushed particles can be exemplified.

Further, as the rust preventive in the undercoat mortar composition and the overcoat mortar composition, JIS A6
205 "Rust preventive for reinforced concrete" can be used. For example, nitrites such as calcium nitrite and sodium nitrite, pyroxyethylene bisglycerol porate and polyoxyethylene bisglycerol porate can be used. Examples thereof include borate esters such as latete and oleate, and organic carboxylate salts. In order to incorporate the rust inhibitor into the porous aggregate, and to coat and coat the surface with cement to cure and granulate,
After adding an aqueous solution of a rust inhibitor to the porous aggregate to absorb water, the cement may be coated on the surface without drying, and the cement hardens with moisture on the surface of the porous aggregate by curing. I do. As the cement, for example, Portland cement, Portland-based mixed cement,
White cement, jet cement and the like can be used. Fine cement, an inorganic admixture, a dispersant, a thickener, and the like are blended, and the mixture is kneaded by adding water at the time of use. Since the surface of the aggregate thus obtained is coated with cement, the solubility of the built-in rust inhibitor slows down, and the rust-preventing effect of the inorganic cured product (layer) containing this is longer. Become

In addition, instead of a rust inhibitor, an alkali metal salt such as lithium silicate or lithium nitrite is incorporated in the porous aggregate, and the surface is coated with cement to be cured and formed. You may make it granulate.

The aggregate thus produced can be appropriately mixed with other commonly used aggregates and mixed with the mortar composition. The aggregate containing a rust preventive and the alkali metal salt are incorporated. You may make it use together with an aggregate.

The cured inorganic material (layer) obtained by curing the mortar composition containing such an aggregate is uniformly dispersed and mixed with a rust inhibitor or an alkali metal salt. The metal salt gradually dissolves little by little, and exhibits a rust-preventive effect over a long period of time. At this time, the alkali metal salt renders the inorganic cured product alkaline for a long period of time, delays the neutralization rate, and prevents rust. Therefore, by filling the mortar composition for undercoating-in a portion where defects are generated, a rust-proofing effect over a long period of time is imparted. Similarly, by applying the above-mentioned mortar composition for top coating, a rust-preventive effect over a long period is imparted to the surface layer portion.

The mortar composition containing a synthetic resin in the overcoat mortar composition may be an acrylic resin emulsion, an ethylene / vinyl acetate copolymer emulsion, ethylene, vinyl acetate, styrene, or acrylate. Synthetic resin emulsion, S
BR latex, epoxy resin emulsion and the like are mixed in a mortar composition to increase the moisture permeability, and may be those containing the above-mentioned rust inhibitor or alkali metal salt.

Further, the mortar composition containing an inorganic waterproofing agent containing SiO ₂ as a main component in the overcoat mortar composition contains cement and silica sand as main components, and has a shrinkage reducing agent, a water-repellent agent, and an increasing agent. The mortar composition to which the adhesive is added may contain 1 to 40% by weight of an inorganic waterproofing agent containing SiO ₂ as a main component and 0.2 to 5% by weight of mica powder, and the solid substance has low water absorption. (20 g or less of water absorption), low water permeability (0.5 ml or less of water permeability), and high moisture permeability (10% of moisture permeability by a measuring method described later).
00g / m ² · 24h or more).

The inorganic waterproofing agent containing SiO ₂ as a main component is incorporated in an amount of 1 to 40% by weight, preferably 2 to 30% by weight. If the amount of the inorganic waterproofing agent is less than 1 wt%, the above effect is not exhibited, and if it is more than 40 wt%, the effect is not further improved and it is useless. The above-mentioned inorganic waterproofing agent is specifically “BBconcentrate” (manufactured by Nippon Bandex), which is mainly composed of SiO ₂ , BaSO ₄ , Z
nS contains a trace amount of mineral oil.

Further, in order to improve watertightness, reduce the presence of calcium hydroxide in the cured product, and prevent bleaching due to water wetting during or after curing, 5 to 50 wt. %, Preferably 3000 to 60
It is preferable to add about 100 cm ² / g of 5 to 30 wt%. Furthermore, in consideration of strength, moisture characteristics, and workability, a particle size is appropriately selected from a range of a particle size of about 0.01 to 2 mm,
It is selected from inorganic aggregates in consideration of durability, and 5 to 60 wt% of silica sand, cold water stone and the like are blended. Preferably 10-5
It is good to mix 0 wt%. Further, in order to improve workability, prevent cracks, and reduce water permeability and water absorption, 0.2 to 5 wt% of mica powder is blended. Preferably, in consideration of workability and finished surface, powder of about 1 mm or less
It is good to mix about wt%. In addition, in consideration of workability, a thickener such as methylcellulose, hydroxypropylmethylcellulose, and hydroxyethylcellulose, and an inorganic admixture such as pulverized pulp, dolomite plaster, and fly ash may be blended. Further, in order to reduce shrinkage, a high-performance water reducing agent such as a sulfonated melamine formalin condensate salt type, a naphthalenesulfonic acid formalin condensate salt type or the like, and a shrinkage reducing agent such as an inorganic swelling shrinkage reducing agent may be blended. good. Considering the strength of mortar, Young's modulus, etc., generally used inorganic admixtures such as dolomite plaster, fly ash, slaked lime, bentonite, etc., EVA-
Foamed calcium carbonate particles may be blended. Permeability,
In order to reduce water absorption, commonly used metal soaps such as calcium stearate, silicone-based water repellents, zirconium-based and fatty acid-based waterproofing agents may be used in combination. In addition, in order to improve and stabilize the adhesiveness of the mortar, the moisture permeability of acrylic-based, SBR, EVA-based, etc. cement-mixing polymer dispersions or EVA-, vinyl acetate-, acrylic-based, etc. re-emulsifying powder resins is reduced. It may be used within a range that does not.

In the present invention, first, a one-part curable resin composition or a moisture-permeable polymer cement paste is applied, and the one-part curable resin composition contains 0.5 to 1 isocyanate group.
0% by weight and 0.4-7.5% by weight of hydrolyzable silane groups (based on silicon atoms) and a molecular weight of 3000
A polymer having a molecular weight of up to 50,000 may be synthesized, and this may be used as a main component, and an additive such as an antifoaming agent may be blended to form a paint. For example, vinylol OLX-5766 (Showa Kogaku Co., Ltd.) Such commercially available products may be used. Since the one-part curable resin composition has a low molecular weight, it generally has a low viscosity of 10 to 30 cps at a solid content of 10 to 20%. Therefore, since the one-component curable resin composition is a solution having a low molecular weight and a low viscosity, the permeability of the inorganic cured product into fine voids is excellent. The one-part curable resin composition forms a layer having moisture permeability several times higher than that of a conventional primer. Therefore, when the one-part curable resin composition is applied to a repaired portion of an inorganic cured material that is remarkably aged, the one-part curable resin composition penetrates deeply into fine voids on the surface and exhibits extremely high adhesiveness. In addition, since it has high moisture permeability after being cured, there is no occurrence of dew condensation inside. On the other hand, moisture-permeable polymer cement pastes include acrylic resin emulsions, ethylene-vinyl acetate copolymer emulsions, multi-component synthetic resin emulsions composed of ethylene, vinyl acetate, styrene and acrylate esters, SBR latex, epoxy resin emulsions, etc. Is mixed with cement paste to increase the moisture permeability, and has the same effect as the one-part curable resin composition. This permeable polymer cement paste may be mixed with the above-mentioned rust inhibitor or alkali metal salt. Either one of the two may be used, but when both are used in combination, that is, after the one-part curable resin composition is applied, the water-permeable polymer cement paste is applied, and further applied thereon. Adhesion with the mortar composition for undercoating can be improved.

Thereafter, the undercoating mortar composition is applied to the portion where the defect has occurred. The application of the undercoating mortar composition imparts a long-lasting rust-preventive effect. Has already been described, and will not be described.

Next, a description will be given of the above-mentioned spall-preventing connecting member and a method of applying the same. As described above, the spall-preventing connecting member includes a hairpin-shaped bifurcated shaft extending in the thickness direction and a rod-shaped or annular locking member extending in the vertical direction. Has a shape in which the leg portion expands from the bulging portion, which is a base end, toward the distal end, and the locking member is swingably and loosely connected to the bulging portion to be connected thereto. For example, the spalling prevention connecting member 1 shown in FIG.
Is an embodiment in which an annular locking member 6 is used, 2 denotes a tip, 3 denotes a bulging portion, and 4 denotes a bifurcated shaft. Further, one or both ends 2 of the bifurcated shaft 4 may be bent outward as in the embodiment shown in FIG. When the leg of the bifurcated shaft is inserted into the insertion hole formed in the thickness direction, and the locking member is inserted into the groove formed in the vertical direction, the buried portion is deeper in the thickness direction, and the shallow portion is formed. Since the fixing portion is fixed so that the locking portion is located, the deep portion and the shallow portion in the thickness direction can be partially bound to prevent peeling. This spalling prevention member is not particularly limited in its configuration, material, dimensions, and the like, but since the bifurcated shaft body and the connection structure with the locking member have flexibility, shrinkage due to temperature change, dry and wet, etc. It can follow the earthquake, etc. to some extent, restraining the resulting movement,
Can be absorbed. Further, when the diameter of the insertion hole is smaller than the expanded dimension of the leg portion, it can be firmly bound even when inserted from the lower surface due to elasticity. Furthermore, this spalling prevention connecting material is easy to manufacture an article. In particular, those having the tip bent outward have high physical insertion strength into the insertion hole. When drilling the insertion hole or engraving the groove portion, after cleaning, it is sufficient to insert the peel-off preventing connecting material and fill the above-mentioned moisture-permeable polymer cement paste or epoxy adhesive.

Further, the laying work of the net material will be described. As described above, the mortar composition for intermediate coating is applied, and the net material is pressed by a gold iron or the like to bury the net material. The mortar composition for intermediate coating is an acrylic resin emulsion, an ethylene / vinyl acetate copolymer emulsion, a multi-component synthetic resin emulsion composed of ethylene, vinyl acetate, styrene, and acrylate ester, an SBR latex, an epoxy resin emulsion, and the like. And a mixture of the above-mentioned rust inhibitor and alkali metal salt. By laying the net material in this manner, the plateiness of the inorganic cured material (layer) on the inner surface side can be revived. And
Since the function of the laminated board is produced, it is possible to suppress the bleeding phenomenon due to the negative pressure and the like caused by the temperature difference under the natural environment and the strong wind, and to prevent the inorganic cured product (layer) from peeling off.

Thereafter, the above-mentioned mortar composition for top coating is applied. By applying the mortar composition for top coating, an effect of not accumulating moisture inside, a rust-preventing effect for a long period of time, and the like are imparted. This is the same as described above, and will not be described.

As described above, the repair method of the hybrid outer wall according to the present invention forms a repair layer having excellent moisture permeability and reinforcing the surface layer on the repair portion of the aged inorganic hardened material to release the moisture inside to the outside. It is possible to apply an undercoat mortar composition that imparts a rust-preventive effect to the parts where defects have occurred or the parts where the reinforcing bars etc. are exposed, and to the parts where floating occurs by using a spalling prevention connecting material. In addition to preventing spalling, movement caused by shrinkage due to temperature change or dry / wet can be suppressed and absorbed, and the surface layer is reinforced by a net material laid thereon.

The outer wall repaired according to the present invention has excellent moisture permeability and rust preventive effect in each layer from the lowermost layer to the uppermost layer of the repaired portion. Therefore, the outer wall is neutralized by the synergistic action of each layer. The effect of preventing progress of steel, corrosion of reinforcing steel, surface deterioration, and the like becomes extremely high. That is, conventionally, only a very narrow partial prescription is performed, the effect is also limited to an extremely narrow range, and the effect was not long-lasting, but in the present invention,
Repairs are applied to the missing part and the part where floating occurs according to each, and as described above, it can maintain the moisture permeability effect and the rust prevention effect in a wide range for a long period of time, in addition to preventing peeling and strengthening the protection of the frame Can also be performed at the same time.

[0024]

【Example】

Test 1: Pin performance evaluation [Pin pull-out test] (1) Test board The concrete board used in the test had a standard composition in a building with a water-cement ratio of 60% as shown in Table 1, and kneaded concrete. After, plywood formwork 300mm × 30
0mm x 50mm in thickness
After curing for a time, the mold was removed. Then, it is cured in water at 20 ° C ± 2 ° C for 5 days, and is further kept in a constant temperature and humidity room (temperature 20 ° C ± 2 ° C).
A substrate cured for 21 days or more at 65 ° C. and a humidity of 65% ± 10%) was used as a test substrate.

[Table 1]

(2) Preparation of Test Specimen (n = 3) A hole having a diameter of 8 mm and a depth of 30 mm was formed in the test substrate using an electric drill, and the inside of the hole was cleaned. Epoxy adhesive: “Structbond 300S” manufactured by Mitsui Toatsu Chemicals, Inc.) was injected, and a spalling-preventing connecting material having the shape shown in FIG. 1 was set. The specimens were cured in a constant temperature and humidity room (temperature 20 ° C. ± 2 ° C., humidity 65% ± 10%) until the age of 4 weeks. In addition, the same test was performed on the spalling prevention connecting member having the shape shown in FIG. Further, the polymer cement paste of Example 1 was injected instead of the adhesive for the anchor pin, and the same test was carried out on the case where the spalling prevention connecting material shown in FIG. 1 was set. For comparison, a test using a conventional anchor pin (= T-type pin) and a test using a mechanical fixing type using no adhesive for the anchor pin (a type in which the tip is opened by hitting the head) were also tested.

(3) Test method The test specimen was set on an autograph (Shimadzu AG-5000C), a tensile load was applied at a crosshead speed of 2 mm / min, and the maximum load was measured.

(4) Test results The results are shown in Table 2.

[Table 2]

[Pin head holding force test] (1) Test substrate The mortar plate used in the test was kneaded with the composition shown in Table 3 and then kneaded with a plywood frame 300 mm x 300 mm x thickness 30.
mm, and after being cured in a test room for 48 hours, it was demolded. After curing for 5 days in water at 20 ° C ± 2 ° C, the room is kept in a constant temperature and humidity room (temperature 290 ± 2 ° C, humidity 65%).
(± 10%) and cured for 21 days or more were used as test substrates.

[Table 3]

(2) Preparation of Test Specimen (n = 3) A hole having a diameter of 8 mm was formed in the test substrate using an electric drill, and after cleaning the inside of the hole, the shape shown in FIG. The connecting material was set. Adhesive for anchor pin from the back side (Epoxy adhesive: "Stract Bond 300"
S ”manufactured by Mitsui Toatsu Chemical Co., Ltd.), fixed the pins, cured in a constant temperature and humidity chamber (temperature 20 ° C. ± 2 ° C., humidity 65% ± 10%) until 4 weeks of age. And In addition, the same test was performed on the spalling prevention contact material having the shape shown in FIG. For comparison, a test using a conventional anchor pin (= T-type pin) and a test using a mechanical fixing type using no adhesive for the anchor pin (a type in which the tip is opened by hitting the head) were also tested.

(3) Test Method The test specimen was set on an Autograph AG-5000C (manufactured by Shimadzu Corporation), and a tensile load was applied from the back side at a crosshead speed of 2 mm / min to measure a maximum load.

(4) Test Results The results are shown in Table 4.

[Table 4]

Test 2: Basic physical properties of polymer cement mortar (1) Preparation of test specimen and test method Each polymer cement mortar was prepared with the composition shown in Table 5, and each test item except for moisture permeability was JIS A
According to 6916, the moisture permeability test was performed according to the Japanese Society of Building Finishing Method B. Similarly, one-part curable acrylic resin “EX-1500” manufactured by Showa Kogyo Co., Ltd.
Was also tested for moisture permeability.

[Table 5]

The rust-preventive agent-containing aggregate shown in Table 5 (manufactured by Fujikawa Building Materials Co., Ltd.) was produced by the following method. Zeolite ("Zeolite 1424" particle size 1.2-0.7 m
m, air-dried bulk specific gravity 0.54, water absorption 50-70 wt%, manufactured by Shin-Tohoku Chemical Co., Ltd.) 480 parts, tap water 180 parts, and rust preventive ("Palic C" manufactured by Fujisawa Pharmaceutical Co., Ltd.)
After mixing 90 parts with ordinary Portland cement 2
60 parts were added and mixed and granulated. After curing for 48 hours, the mixture was dried. In addition, the alkali metal-containing aggregate (manufactured by Fujikawa Building Materials Co., Ltd.) in Table 5 was manufactured by the following method. Zeolite ("Zeolite 1014" particle size 1.2-0.7m
m, air-dried bulk specific gravity 0.59, water absorption 50-70 wt%, manufactured by Shin-Tohoku Chemical Co., Ltd.) 480 parts, and alkali metal salt ("LINI25" lithium nitrite aqueous solution, manufactured by Nissan Chemical Industry Co., Ltd.) 250 parts And 260 parts of ordinary Portland cement were added, and the mixture was granulated, cured for 48 hours, and then dried.

(2) Test results The results are shown in Table 6.

[Table 6]

Test 3: Adhesion of polymer cement mortar to existing finishing materials (1) Test substrate The concrete substrate used for the test was 60% water cement.
After mixing the concrete with the standard composition in the construction of the above (Table 1), the plywood formwork 300 mm x 300 m
It was cast into a size of mx 50 mm in thickness, cured in a test room for 48 hours, and then demolded. After curing for 5 days in water at 20 ° C ± 2 ° C, furthermore, a thermo-hygrostat (temperature 20 ° C ± 2 ° C,
A substrate cured for 21 days or more at a humidity of 65% ± 10%) was used as a test substrate.

(2) Preparation of Test Specimen 1-1) Adhesion of Tiles Tiles [porcelain coated exterior tiles (50 double tiles) are applied to the test substrates by using the tile adhering mortar shown in Table 7.
Glossy), and put it in a constant temperature and humidity chamber (temperature 20 ° C ± 2
C., 65% ± 10% in humidity) and cured for up to 4 weeks to prepare a base plate.

[Table 7]

1-2) Application of Architectural Finish Coating Material Standard application amount (1.8 kg / m) of various finishing coating materials (exterior thin coating material E, multilayer coating material E, multilayer coating material RE) on the test substrate.
² , 1.5 kg / m ² , 2.3 kg / m ² ) according to the specifications, and a constant temperature and humidity room (temperature 20 ° C. ± 2 ° C., humidity 65%)
(± 10%) until the age of 4 weeks.

2) Application of Polymer Cement A standard application amount (0.45 kg / m ² ) of the polymer cement paste of Formulation Example 1 was applied to each of the base plates, and a constant temperature and humidity chamber (temperature: 20 ° C. ± 2 ° C., The specimens were cured at the age of 2 weeks at a humidity of 65% ± 10%). Also, the concrete plate shown in Table 1 was coated with a one-component curable acrylic resin "EX-1500" manufactured by Showa Kogyo Co., Ltd. undercoating, and the polymer cement paste of Formulation Example 1 was applied thereto. Tested. For comparison, Comparative Formulation Example 1
A test using the polymer cement paste was also tested in the same manner.

(3) Test Method The test specimen was set on an Autograph AG-5000C (manufactured by Shimadzu Corporation) and the crosshead speed was 1 mm /
A tensile load was applied in min, the maximum load was determined, and the adhesion strength was measured. Shown as the average value of three samples.

(4) Test Results The results are shown in Table 8.

[Table 8]

Test 4: Confirmation of reinforcing effect of existing mortar of glass fiber net (1) Test substrate The mortar plate used for the test was prepared by mixing and mixing mortar (lasmol: manufactured by Fujikawa Building Materials Co., Ltd.). The mold was cast into a size of 300 mm x 75 mm x 40 mm in thickness, cured in a test room for 48 hours, and then demolded. Then, it is cured for 5 days in water at 20 ° C. ± 2 ° C., and further cured in a constant temperature and humidity room (temperature 290 ± 2 ° C., humidity 65% ± 10%).
A substrate cured for more than one day was used as a test substrate.

(2) Preparation of Test Specimen (n = 3) On the plywood form surface side of the test substrate, based on the specifications, a glass fiber net or the like with the polymer cement mortar of Formulation Example 2 (the contents are shown in Table 9) ) Was affixed and cured in a constant temperature and humidity chamber (temperature: 20 ° C. ± 2 ° C., humidity: 65% ± 10%) until the age of 10 days to obtain a test body.

(3) Test Method As shown in FIG. 4, the test specimen was autographed (Shimadzu AG).
-5000C), crosshead speed 0.5m
A one-point bending load was applied at m / min, and the maximum load, the load at the time of crack occurrence, and the energy value from the start of the test to the end of the test (up to 0.5% of full scale) were determined. In addition, it was compared with a glass fiber net or the like without reinforcement.

(4) Test Results The results are shown in Table 9.

[Table 9]

Test 5: Durability test of composite repair method (1) Preparation of test specimen (N = 1, n = 5) A base plate was prepared in the same manner as described in Test 3, and after completion of curing, After the polymer cement paste of Formulation Example 1 was applied, a glass fiber net (manufactured by Nippon Electric Glass Co., Ltd., “Alkali resistant glass fiber T
D5x5 ") and a constant temperature and humidity room (temperature 20 ° C ± 2
(C °, humidity 65% ± 10%) until the age of 4 weeks. Similarly, the polymer cement paste of Comparative Formulation Example 1 was applied, and then the polymer cement mortar of Comparative Formulation Example 2 was applied and smoothed for comparison.

(2) Heat-cooling repetition test An infrared lamp was irradiated for 105 minutes so that the surface temperature became 70 ° C., and then water was sprayed for 15 minutes. However, the water temperature is 15 ± 5
C., the amount of water sprayed per specimen was 6 liters per minute. After the completion of 300 cycles, the test was left for 24 hours in a thermo-hygrostat (temperature 20 ° C. ± 2 ° C., humidity 65% ± 10%), and then the test was performed.

(3) Test Result The test specimen after the heat-cooling repetition test was set on an autograph (Shimadzu AG-5000C), and a one-point bending load was applied at a crosshead speed of 0.5 mm / min to determine the maximum load. The adhesive strength was measured. The appearance was visually observed. The results are shown in Table 10.

[Table 10]

Test 6: Field construction experiment of the composite repair method A concrete structure finished with the thin outer wall coating material E (about 4
000m ² ) About 10 years old.
First, the wall surface was washed with high-pressure water, the explosion of the reinforcing bar was peeled off, and the rust of the reinforcing bar was removed with a wire brush. Thereafter, a mixture obtained by mixing a rust preventive with the polymer cement paste (moisture-permeable polymer cement paste) of Formulation Example 1 is applied.
Rust prevention treatment was applied. Thereafter, the defective portion was coated with the polymer cement mortar of Formulation Example 3 (mortar composition for undercoating) and repaired. This wall is about 20cm in diameter at intervals of about 50cm.
The finished portion of the exterior thin coating material E was peeled off in a circular shape with a disc sander of about m to make it easy for moisture inside the frame to escape. At the floating portion of the mortar, about 5 pieces of the spalling prevention connecting material shown in FIG.
Pinning was performed at 0 cm intervals, and fixed with an epoxy-based adhesive (“Stract Bond 300S” manufactured by Mitsui Toatsu Chemicals, Inc.). Then, apply the polymer cement mortar of Formulation Example 2 (the mortar composition for intermediate coating) to the entire surface, immediately apply a glass fiber net (“Alkali-resistant glass fiber TD5 × 5” manufactured by Nippon Electric Glass Co., Ltd.) and trowel it. It blended in with the cement mortar. On the next day, the polymer cement mortar of Formulation Example 2 (the mortar composition for intermediate coating) was applied all over again to provide a smooth ground. Then 2
After a curing period of one week, it was finished with a highly permeable inorganic finishing material (manufactured by Fujikawa Building Materials Co., Ltd.).

[0049]

As described above, the repair method of the hybrid outer wall according to the present invention forms a repair layer having excellent moisture permeability and reinforcing the surface layer on the repaired portion of the aged inorganic hardened material to reduce the internal moisture. An undercoat mortar composition that imparts rust-preventive effect can be applied to areas where defects can be released and areas where reinforcing bars, etc. are exposed. The connecting material prevents peeling and suppresses and absorbs movement caused by temperature changes and shrinkage due to wet and dry, and furthermore, the surface layer is reinforced by a net material laid on it, It repairs cracks in the skeleton, progress of neutralization, corrosion of reinforcing steel, surface deterioration, etc., and can simultaneously achieve the prevention of peeling of the finish and the enhancement of skeleton protection performance by adding a new surface finishing layer. That.

Therefore, the outer wall repaired according to the present invention has excellent moisture permeability and rust preventive effect in each layer from the lowermost layer to the uppermost layer of the repaired portion. The effect of preventing progress, rebar corrosion, surface deterioration, etc. is remarkably high. That is, in the past, only a very narrow partial prescription was performed, the effect was also limited to an extremely narrow range, and the effect was not long-lasting, but in the present invention, the synergistic effect of each layer was As a result, the moisture permeability effect and the rust prevention effect can be maintained over a wide range for a long period of time, and furthermore, the damaged part and the part where the floating occurs are repaired according to each, in addition, the peeling prevention and the strengthening of the frame protection performance have been made at the same time It will be.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a spalling prevention connecting member using a bar-shaped locking member.

FIG. 2 is a perspective view showing an embodiment of a spalling prevention connecting member using an annular locking member.

FIG. 3 is a perspective view showing another embodiment of a spalling prevention connecting member using a bar-shaped locking member.

Continuation of the front page (51) Int.Cl. ⁶ Identification code FI C04B 14:06 14:20 24:38 14:28 24:42 16:02 16:06 24:26) 103: 44 103: 61 103: 65 111: 72 (72) Inventor Daiji Koseki 1587-117, Nara, Tagawa-shi, Fukuoka (56) References JP-A-6-33614 (JP, A) JP-A-6-33613 (JP, A) JP-A-6-2443 (JP, A) JP-A-5-222845 (JP, A) JP-A-5-202620 (JP, A) JP-A-5-149007 (JP, A) JP-A-1-249883 (JP) , A) (58) Field surveyed (Int. Cl. ⁶ , DB name) E04G 23/02 C04B 28/02 C04B 18:14 C04B 22:14 C04B 14:06 C04B 14:20 C04B 24:38 C04B 14: 28 C04B 24:42 C04B 16:02 C04B 16:06 C04B 24:26 C04B 103: 44 C04B 103: 61 C04B 103: 65 C04B 111: 72

Claims (6)

(57) [Claims] 1. A modified portion of an inorganic cured product containing 0.5 to 10% by weight of an isocyanate group and 0.4 to 7.5% by weight of a hydrolyzable silane group (based on a silicon atom). After applying a one-component curable resin composition containing a polymer whose main component is 3,000 to 50,000 and / or a moisture-permeable polymer cement paste, rust prevention is formed in the porous aggregate in portions where defects are generated. Filler is filled with an undercoating mortar composition comprising an aggregate or an alkali metal salt incorporated therein, and an aggregate whose surface is coated with cement. A bar-shaped or annular locking member is loosely fitted and connected to the bent bulging portion of the bifurcated shaft body, and a bifurcated shaft body is inserted into an insertion hole drilled in the thickness direction. And engraved in its vertical direction Inserting a locking member into the grooved portion and fixing the moisture-permeable polymer cement paste or epoxy adhesive in a state of filling the insertion hole and the groove,
Then, after applying the mortar composition for intermediate coating mixed with the synthetic resin to the entire renovated part, the mesh material for reinforcing the inorganic cured material is spotted, and the mesh material is buried by embedding, and has moisture permeability. A method for repairing a hybrid outer wall, wherein a mortar composition for top coating is applied. 2. The modified part of the cured inorganic material contains 0.5 to 10% by weight of an isocyanate group and 0.4 to 7.5% by weight of a hydrolyzable silane group (based on a silicon atom). After applying a one-component curable resin composition containing a polymer whose main component is 3,000 to 50,000 and / or a moisture-permeable polymer cement paste, the portion where defects are generated has a particle size of 0.06 to 5 mm. Dry bulk specific gravity 0.1 ~
1.5, filled with a mortar composition for undercoating comprising a porous aggregate having a water absorption of 15 to 500 wt%, and a part having floating is provided with a hairpin-shaped bifurcated shaft having flexibility. A bar-shaped or annular locking member is loosely fitted to the bent bulging portion, and a bifurcated shaft is inserted into the insertion hole formed in the thickness direction by inserting a peel-prevention connecting member formed by loosely connecting the locking member. Inserting the locking member into the groove formed in the direction and fixing the moisture permeable polymer cement paste or epoxy adhesive in a state of filling the insertion hole and the groove, and then mixing the synthetic resin into the entire repaired part. After applying the mortar composition for coating and embedding the mesh material by spotting and pressing the mesh material for reinforcing the inorganic cured material, the mortar composition for top coating having moisture permeability was applied. Characterized by that Brides outer wall repair method. 3. The method for repairing a hybrid outer wall according to claim 1, wherein a rust inhibitor or an alkali metal salt is added to the moisture-permeable polymer cement paste. 4. A mortar composition for intermediate coating, wherein a rust inhibitor or an alkali metal salt is blended.
A method for repairing a hybrid outer wall according to any one of the above. 5. A mortar composition for a top coat having moisture permeability, a mortar composition mixed with a synthetic resin, SiO ₂
Mortar composition containing an inorganic waterproofing agent containing, as a main component, a particle size of 0.06 to 5 mm and an air-dry bulk specific gravity of 0.1 to
1.5, a mortar composition containing a porous aggregate having a water absorption of 15 to 500 wt%, a rust inhibitor or an alkali metal salt incorporated in the porous aggregate, and the surface thereof is coated with cement. Mortar composition containing mixed aggregates, particle size 0.06 to 5 mm, air-dry bulk specific gravity 0.1 to 1.5, water absorption 15 to 500 wt% in a porous aggregate having a rust inhibitor or alkali metal The hybrid outer wall according to any one of claims 1 to 4, wherein any one of a mortar composition containing an aggregate in which a salt is incorporated and whose surface is coated with cement is used. Renovation method. 6. The method for repairing a hybrid outer wall according to any one of claims 1 to 5, wherein the bifurcated shaft has one or both ends bent outward.