JPH05169014A - Method for preventing rush of corrosive metallic material in inorganic cured matter - Google Patents

Abstract

PURPOSE:To improve durability over a long period of time and to obviate the generation of condensed water, etc., in the repaired or reformed surface of inorg. cured matter embedded with a corrosive metallic material by coating this surface with a specific one-pack curing type resin compsn. CONSTITUTION:The repaired or reformed surface of inorg. cured matter embedded with the corrosive metallic material is coated with the one-pack curing type resin compsn. essentially consisting of a polymer contg. 0.5 to 10wt.% isocyanate group and 0.4 to 7.5wt.% hydrolyzable silane group (based on a silicon atom) and having 3000 to 5000mol.wt. Since the one-pack curing type resin compsn. is a primer having excellent penetratability, the compsn. has the excellent effect of reinforcing the substrate of the reformed surface or repaired surface and improves the strength of adhesion of the mortar to be replenished and applied afterward. This one-pack curing type resin compsn. has high moisture permeability and, therefore allows the penetration of the moisture in the reformed surface or repaired surface and the generation of the condensed water, etc., therein is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method of protecting a corrosive metal material in an inorganic hardened material capable of protecting steel materials such as a skeleton and lath mortar and improving durability during repair or repair. Regarding More specifically, particularly for a repaired surface or a repaired surface that is markedly aged, the base is reinforced by applying a specific one-component curable resin composition, and the adhesive strength of supplemental mortar or coated mortar is improved, and Since this one-component curable resin composition layer has high moisture permeability, the effect of the rust preventive agent contained in the supplemental mortar or the coated mortar extends to the inside of the repaired surface or the repaired surface and is corrosive. Corrosion in the inorganic cured product that suppresses rusting of metal materials, prevents deterioration of the cured inorganic product over a long period of time, and can release dew condensation water to the outside without staying inside The present invention provides a method of rustproofing a metallic material.

[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 occurs in the corrosive metal material due to intrusion of rainwater or the like, a volume expansion causes cracks in the inorganic hardened material, It crushes. In particular,
When a high concentration of chlorine ions is mixed in the inorganic cured product, the corrosive metal material corrodes relatively easily. Conventionally, as a method of rustproofing the corrosive metal material in the above-mentioned inorganic hardened material, after applying cement paste as a primer layer on the repair surface or repair surface, calcium nitrite, lithium silicate, etc. There is known a method of applying a mortar composition containing a water-soluble silicate compound, a polyhydric alcohol nitroester, or other rust inhibitor. However, when the repaired surface or the repaired surface is significantly aged, there is a problem that the above-mentioned cement paste does not exert a sufficient primer effect and the adhesive strength of the mortar composition to be subsequently applied becomes extremely low. there were.

Therefore, for repairing or refurbishing surfaces that are markedly aged as described above, synthetic resin liquids such as chlorinated rubber-based, chlorinated paraffin-based, chlorinated polyolefin-based, acrylic-based resin-soluble synthetic resins, or urethane. A reaction-curable synthetic resin liquid such as an epoxy resin, an epoxy resin, or a silicone resin is used as a primer (liquid).

[0004]

However, even when the above-mentioned synthetic resin liquid is used as a primer, the following problems remain. Since the resin-soluble type synthetic resin liquid does not react after coating, it is designed to have strength by using a polymer having a relatively high molecular weight. Therefore, the solution inevitably has a high viscosity, and the permeability to the repaired surface or the repaired surface becomes poor, so that sufficient adhesive strength cannot be obtained. Further, since the formed primer layer has low moisture permeability, even if the surface is coated with a mortar composition containing a rust preventive agent, this primer layer suppresses the penetration of the rust preventive agent, and the repair surface Alternatively, the anticorrosive effect does not reach the inside of the repaired surface. Further, since the primer layer also suppresses the permeation of the water existing inside the repaired surface or the repaired surface, the water stays in the inside to generate dew condensation water, and the above-mentioned rust preventive effect is further deteriorated. On the other hand, the reaction-curable synthetic resin liquid is designed to have strength by using a low-molecular weight polymer having a functional group and increasing the molecular weight after coating. Therefore, the solution has a low viscosity, has good permeability to the repair surface or the repair surface, and can reinforce the base and the supplementary mortar or the coated mortar can obtain sufficient adhesive strength, but the above-mentioned resin dissolution Similar to the mold type synthetic resin liquid, the moisture permeability of the primer layer was poor.

[0005]

The present invention has been proposed in view of the above, and 0.5 to 10% by weight of an isocyanate group is present on the surface of a cured inorganic material in which a corrosive metal material is embedded.
And a hydrolyzable silane group (based on silicon atom)
Contains 0.4 to 7.5% by weight and has a molecular weight of 3000 to 50
The present invention relates to a method for rust-proofing a corrosive metal material in an inorganic cured product, which comprises applying a one-component curable resin composition containing a polymer of 000 as a main component.

The above-mentioned one-component curable resin composition of the present invention has an isocyanate group content of 0.5 to 10% by weight and a hydrolyzable silane group content of 0.4 to (based on silicon atom).
A polymer containing 7.5% by weight and having a molecular weight of 3,000 to 50,000 may be synthesized, and an additive such as an antifoaming agent may be added as a main component to form a coating. For example, vinylol OLX -5766 (Showa High Polymer Co., Ltd.)
You may use a commercial item like these. Since the one-component curable resin composition used in the present invention described above has a low molecular weight,
Generally, a solid content of 10 to 20% results in a low viscosity of 10 to 30 cps. Therefore, since this one-pack curable resin composition is a solution having a low molecular weight and a low viscosity, the penetrability of the inorganic cured material into fine voids is excellent. Further, the one-component curable resin composition described above forms a layer having a moisture permeability several times higher than that of the conventional primer as described above. Therefore, when the one-component curable resin composition as described above is applied to the surface of concrete, lightweight cellular concrete (ALC), lath mortar or the like or a repaired part, it penetrates deeply into minute voids on the surface and is extremely high. Shows adhesiveness. Further, since it has high moisture permeability after being hardened, no dew condensation water or the like is generated inside.

As described above, after applying the one-part curable resin composition, a mortar composition obtained by simply kneading a rust preventive agent and the like with cement or aggregate may be applied. In this case, the rust preventive penetrates even into the inside of the one-component curable resin composition and suppresses rusting of the corrosive metal material inside the repaired surface or the repaired surface. However, as described above, the mortar composition obtained by simply kneading the rust preventive and the like together with the cement, the aggregate and the like has the effect of limiting the rust preventive to the extremely short period of time because the rust preventive easily flows out by rainwater or the like.

In order to continue the rust preventive effect for a long period of time, it is advisable to apply a mortar composition obtained by mixing an aggregate containing a rust preventive agent in a porous aggregate.

The above-mentioned porous aggregate has fine pores,
Any material may be used as long as it has a water absorbing property, and the material and the property are not particularly limited. Therefore, not only the inorganic aggregate but also an organic foam aggregate such as ethylene-vinyl acetate foam aggregate may be used as the porous aggregate of the present invention. However, in particular, by using a porous aggregate having a particle size, an air-dry bulk density, and a water absorption rate as shown below, it is possible to improve the troweling workability of an inorganic cured product containing the porous aggregate, which is obtained. It is possible to reduce the water permeability of the inorganic cured (molded) product and improve the moisture permeability. That is, the particle size is 5 to 0.06 mm, more preferably 2.5 to 0.1 in consideration of the ironing work.
It suffices to use one having a range of mm. Air-dry bulk density is
The thing of 1.5-0.1 should just be used. If it is 1.5 or more, the impregnating and adsorbing ability of the rust preventive agent becomes low, and the moisture permeability of the obtained inorganic cured product deteriorates. Further, if it is 0.1 or less, the strength of the obtained inorganic cured product is lowered, and the water permeability and water absorption are increased, which is not preferable. Further, the water absorption rate may be 500 to 15 wt%. 500w
If it is t% or more, the impregnating and adsorbing ability of the rust preventive agent and the alkali metal salt increases, but the strength of the obtained mortar decreases, and the water permeability and water absorption increase, which is not preferable. On the other hand, if it is 15 wt% or less, the impregnating and adsorbing ability of the rust preventive agent and the alkali metal salt is lowered, and the moisture permeability of the obtained inorganic cured product is lowered. As the above-mentioned porous aggregate having air-dry bulk specific gravity and water absorption, natural zeolite (mordenite, clinoptilolite, xM (2 / n) O.Al ₂ O ₃ ySi is used.
O ₂ · zH ₂ O) crushed granules, granules, granulated pellets, granulated granules, allophane, natural silica alumina gel, Al ₂ O ₃ · mSiO ₂ · nH ₂ O + A
l (OH) ₃ ) granules, granules, diatomaceous earth granulated fired particles, or tuff-based natural glass fired products, rhyolite-based natural glass pumice stone, calcium silicate crushed particles, foamed glass particles, refractory brick crushed particles , ALC crushed particles and the like can be exemplified.

Further, as a rust preventive agent, JIS A 6
No. 205 “corrosion inhibitor for reinforced concrete” may be used, and examples thereof include nitrites such as calcium nitrite and sodium nitrite, and pyroxyethylene bisglycerol porate and polyoxyethylene bisglycerol porate. Examples thereof include borate esters such as oleate and oleate, and organic carboxylic acid salts.

In order to incorporate the above-mentioned rust preventive agent into the above-mentioned porous aggregate, an aqueous solution of the rust preventive agent is added to the porous aggregate to absorb water, and then dried to evaporate water. For example, the porous aggregate may be impregnated with an aqueous solution of a rust preventive agent to sufficiently absorb water, and then air dried.

Further, the surface of the above-mentioned aggregate may be coated with cement so as to be hardened and granulated. Examples of the above-mentioned cement include Portland cement, Portland mixed cement, white cement,
Jet cement or the like can be used. In this case, after adding an aqueous solution of a rust preventive agent to the porous aggregate to absorb water, the surface of the aggregate may be coated with cement without drying. It cures with water. Since the surface of the aggregate thus obtained is coated with cement, the solubility of the rust preventive incorporated therein is further delayed, and the rust preventive effect of the mortar composition containing this is prolonged. ..

Instead of the rust preventive agent, for example, an aggregate in which an alkali metal salt such as lithium silicate or lithium nitrite is contained in the porous aggregate may be mixed in the mortar composition. The aggregate in which the alkali metal salt is incorporated in the porous aggregate can be produced by adding an aqueous solution of the alkali metal salt into the porous aggregate to absorb water, and then drying and evaporating the water content. it can. Alternatively, after adding an aqueous solution of an alkali metal salt into the porous aggregate to absorb water,
The surface of the cement may be coated without being dried so that the cement is hardened and granulated.

The aggregate thus produced can be appropriately mixed with other commonly used aggregates to be compounded in the mortar composition, and the aggregate containing the anticorrosive and the alkali metal salt are incorporated. You may make it use together with aggregate. An inorganic hardened product obtained by curing this mortar composition has a rust preventive agent or an alkali metal salt uniformly dispersed and mixed therein, and the rust preventive agent or the alkali metal salt is gradually dissolved in a trace amount, and for a long period of time. Exerts anti-corrosion effect. At that time, the alkali metal salt makes the inorganic cured product alkaline over a long period of time,
The neutralization speed is delayed to prevent rust. Therefore, when the above-mentioned mortar composition is applied to the surface of the above-mentioned one-component curable resin composition (layer), even inside the existing inorganic cured product inside the one-component curable resin composition (layer) Since the rust preventive agent or the alkali metal salt diffuses and penetrates, its deterioration can be prevented.

According to the present invention, as described above, after coating a specific one-component curable resin composition on the surface of an existing inorganic cured product, an aggregate containing a rust preventive or a bone containing an alkali metal salt is contained. It proposes a method of applying a mortar composition prepared by mixing materials, but it is a one-component curable resin composition (layer).
In order to firmly bond the mortar composition (layer) and the mortar composition (layer), it is desirable to apply the mortar composition in a state where the crosslinking reaction of the one-pack curable resin composition is not completely completed. Also,
After applying a one-component curable resin composition to further improve the adhesiveness, apply a cement paste, then,
You may make it apply a mortar composition.

The mortar composition contains an aggregate containing a rust preventive agent and an alkali metal salt. The rust preventive agent and the alkali metal salt are dissolved and diffused in trace amounts. Therefore, the rust preventive effect is extremely prolonged as compared with the case where the rust preventive is simply kneaded with cement or the like. Then, after applying the above-mentioned mortar composition, by further applying a cementitious composition as a topcoat material, diffusion to the surface of the rust preventive agent or alkali metal salt and the outflow from the surface are prevented, so that The effect can be continued for a period of time.

The above-mentioned cementitious composition is a mixture of Portland cement, white cement, Portland mixed cement and the like with fine aggregate, an inorganic admixture, a dispersant, a thickener, etc., and water is added at the time of use. It has been prepared. In this case, in order to improve and stabilize the adhesiveness of the cement-based composition, the cement-dispersing polymer dispersion may be mixed to the extent that the moisture permeability is not impaired. As the above-mentioned polymer mixture for admixing cement, acrylic resin emulsion, ethylene / vinyl acetate copolymer emulsion, ethylene, vinyl acetate, styrene,
A multi-component synthetic resin emulsion consisting of acrylic acid ester, SBR latex, epoxy resin emulsion and the like are suitable.

Further, the rust preventive effect is further improved by incorporating a rust preventive agent into the cement-based composition of such an overcoat.

[0019]

EXAMPLES Examples of the present invention will be shown below.

1. Confirmation test of moisture permeability of one-component curable resin composition (type of sealant) a. Acrylic emulsion sealer (Kouwa Chemical Industry Co., Ltd.) b. Special acrylic emulsion triple solution (ZOL-510
S, manufactured by Nissan Chemical Industries, Ltd.) c. Chlorinated polyolefin (Kowa Chemical Industry Co., Ltd.) d. Solvent type epoxy resin (KBK primer, made by Kanebo NSC) e. Two-component urethane resin (made by Konishi) f. One-component curing type acrylic resin (OLX-5766, manufactured by Showa Polymer Co., Ltd.) g. One-component curable acrylic resin (EX-1500, manufactured by Showa Polymer Co., Ltd.) h. B Paper only (Test method) JIS P in a cup with a diameter of 10.8 cm
Type 1 specified in 3801 (thickness 0.2 mm, weight 90 g
/ M ²⁾ Set the filter paper of the above-mentioned various sealer agent (a to g), respectively two coats (coating amount Total Total 350g
/ M ² ), and in a constant temperature and humidity room at a temperature of 20 ° C and a humidity of 65%
I was cured for 4 hours. Then, 100 g of water was added and the mixture was sealed with paraffin, then weighed, put in a thermostat at 40 ° C., and weight change was measured every 24 hours. Then, the moisture permeability (g / m ² · 24 h) was obtained by the following formula, and the moisture permeability was compared. Moisture vapor transmission rate (g / m ² · 24 h) = m / s m: Reduced mass (g) s: Moisture vapor transmission area (m ² ) 0.009156m ^{2 The} results are shown in Table 1.

[0021]

[Table 1]

2. Confirmation of base reinforcement effect and adhesion performance of one-component curable resin composition (base) ALC panel 7 × 7 × 5 (thickness) cm Standard mortar base 7 defined in JIS A 6916
× 7 × 2 cm (Coating amount of sealant) ALC panel 350 g / m ² Mortar base 100 g / m ² (Cement paste composition) Fujilite # 10 (manufactured by Fujikawa Kenzai Kogyo Co., Ltd.) 100 parts SBR latex 10 parts (KT9157C, Japan Latex Processing Co., Ltd.) Water 35 parts (Testing machine) Autograph AG5000C (Shimadzu Corporation) (Crosshead speed 1 mm / min) (Test method) ALC panel, mortar substrate A standard coating amount was applied to and was cured in a constant temperature and constant humidity chamber (20 ° C., 65%) for 24 hours. Then, the above-mentioned cement paste composition was applied (application amount: 1.5 kg / m ² ) and cured in a thermo-hygrostat for up to 2 weeks, and then an adhesive strength test was conducted. The results are shown in Table 2.

[0023]

[Table 2]

3. Comprehensive determination of one-pack curable resin composition The test results of 1 and 2 described above are summarized in Table 3 and comprehensively determined.

[0025]

[Table 3]

4. Confirmation Test of Anticorrosion Mortar 4-1 Basic Experiment First, aggregates A to K were produced as follows. As the porous aggregate, those shown in Table 4 below were used.

[0027]

[Table 4]

Aggregate A; 120 cc of tap water and Sabinone P
(Rust preventive, manufactured by Kirest Chemical Co., Ltd.) 6.9 g was added,
Stir well to dissolve. Next, zeolite 1014
(Porous aggregate) 58 g, Zeolite 1424 (porous aggregate) 229 g were added and sufficiently stirred to absorb water.
Put in a dryer at 0 ° C to dry.

Aggregate B: Sabinone P in 120 cc of tap water
(Rust preventive agent) 13.8 g is added and sufficiently stirred to dissolve. Next, 58 g of zeolite 1014 (porous aggregate),
After 229 g of zeolite 1424 (porous aggregate) is added and sufficiently stirred to absorb water, it is put in a dryer at 50 ° C. and dried.

Aggregate C: Sabinone P in 120 cc of tap water
(Rust-preventing agent) (6.9 g) is added and sufficiently stirred to dissolve. Next, 58 g of zeolite 1014 (porous aggregate),
After 229 g of zeolite 1424 (porous aggregate) is added and sufficiently stirred to absorb water, 140 g of ordinary Portland cement is added and stirred to carry out adhesion granulation. 20 this
After curing at 65 ° C. for 48 hours, put it in a dryer at 50 ° C. to dry.

Aggregate D; Sabinone P in 120 cc of tap water
(Rust preventive agent) 13.8 g is added and sufficiently stirred to dissolve. Next, 58 g of zeolite 1014 (porous aggregate),
After 229 g of zeolite 1424 (porous aggregate) is added and sufficiently stirred to absorb water, 140 g of ordinary Portland cement is added and stirred to carry out adhesion granulation. 20 this
After curing at 65 ° C. for 48 hours, put it in a dryer at 50 ° C. to dry.

Aggregate E: Sabinone P in 200 cc of tap water
(Rust-preventing agent) (6.9 g) is added and sufficiently stirred to dissolve. Next, Isolite No. 1 (porous aggregate) 188.2
g, Isolite No. 2 (porous aggregate) 168 g are added and sufficiently stirred to absorb water, and then 200 g of ordinary Portland cement is added and stirred to adhere and granulate. 20 this
After curing at 65 ° C. for 48 hours, put it in a dryer at 50 ° C. to dry.

Aggregate F: Sabinone P in 200 cc of tap water
(Rust preventive agent) 13.8 g is added and sufficiently stirred to dissolve. Next, Isolite No. 1 (porous aggregate) 188.2
g, Isolite No. 2 (porous aggregate) 168 g are added and sufficiently stirred to absorb water, and then 200 g of ordinary Portland cement is added and stirred to adhere and granulate. 20 this
After curing at 65 ° C. for 48 hours, put it in a dryer at 50 ° C. to dry.

Aggregate G; Sabinone P in 200 cc of tap water
(Rust preventive agent) 20.7 g is added and sufficiently stirred to dissolve. Next, Isolite No. 1 (porous aggregate) 188.2
g, Isolite No. 2 (porous aggregate) 168 g are added and sufficiently stirred to absorb water, and then 200 g of ordinary Portland cement is added and stirred to adhere and granulate. 20 this
After curing at 65 ° C. for 48 hours, put it in a dryer at 50 ° C. to dry.

Aggregate H; LINI-2 in 100 cc of tap water
5 (lithium nitrite aqueous solution, manufactured by Nissan Chemical Industries, Ltd.)
Add 110 g and stir well to dissolve. Next, 188.2 g of Isolite No. 1 (porous aggregate) and 168 g of Isolite No. 2 (porous aggregate) were added and sufficiently stirred to absorb water, and then put in a dryer at 50 ° C. to be dried.

Aggregate I; LINI-2 in 100 cc of tap water
110 g of 5 (lithium nitrite aqueous solution) is added and sufficiently stirred to dissolve. Next, Isolite No. 1 (porous aggregate) 188.2 g, Isolite No. 2 (porous aggregate) 16
After adding 8 g and stirring sufficiently to absorb water, 200 g of ordinary Portland cement is added and stirred to adhere and granulate. After curing it at 20 ℃ and 65% for 48 hours,
Put in a dryer at ℃ to dry.

Aggregate J; ZOL-51 in 100 cc of tap water
0 (lithium silicate aqueous solution, manufactured by Nissan Chemical Industries, Ltd.)
Add 110 g and stir well to dissolve. Next, 188.2 g of Isolite No. 1 (porous aggregate) and 168 g of Isolite No. 2 (porous aggregate) were added and sufficiently stirred to absorb water, and then put in a dryer at 50 ° C. to be dried.

Aggregate K; ZOL-51 in 100 cc of tap water
Add 110 g of 0 (lithium silicate aqueous solution) and stir it sufficiently to dissolve it. Next, Isolite No. 1 (porous aggregate) 188.2 g, Isolite No. 2 (porous aggregate) 16
After adding 8 g and stirring sufficiently to absorb water, 200 g of ordinary Portland cement is added and stirred to adhere and granulate. After curing it at 20 ℃ and 65% for 48 hours,
Put in a dryer at ℃ to dry.

Mixing Examples 1 to 12 Using the above-mentioned aggregates A to K, the mortar compositions for repair and repair having the blending compositions shown in Tables 5 and 6 were mixed and adjusted.

Comparative Examples 1 to 5 The repairing / repairing mortar compositions having the blending compositions shown in Tables 5 and 6 were mixed and adjusted without using the aggregates A to K.

[0041]

[Table 5]

[0042]

[Table 6]

Specimen 1; The repairing / repairing mortar compositions of the above-mentioned formulation examples 1 to 12 and comparative examples 1 to 5 were kneaded with the amounts of water shown in Tables 5 and 6 in accordance with the Japanese Society of Architectural Standards JASS 15M-102. And put it in a 4x4x16 cm formwork,
Mold. This was subjected to moisture-air curing at a temperature of 20 ° C. and a humidity of 80% or more for 48 hours, then demolded, and then cured in a constant temperature and humidity chamber at a temperature of 20 ° C. and a humidity of 65% for 2 weeks to obtain a test sample 1.

Specimen 2; Specimen 2 was prepared under the same conditions as Specimen 1 described above except that it was molded into 7 × 7 × 2 cm.

Specimen 3; The cement-based composition was overcoated on the front and back surfaces (7 × 7 cm) of Specimen 2 described above, and cured in a constant temperature and humidity chamber at a temperature of 20 ° C. and a humidity of 65% for up to 2 weeks. It was designated as Specimen 3. Two days before the completion of curing, epoxy resin paint was applied to the side surface to seal it. The above cement-based composition was prepared by kneading Fujilite # 10 (previously described) 25 kg, acrylic cement-mixing polymer dispersion (solid content 60%) 2.5 kg, and water into a paste form. did.

Specimen 4; Specimen 4 was prepared under the same conditions as Specimen 3 except that the cementitious composition containing a rust preventive was overcoated. The above cement-based composition containing a rust preventive agent is 25 kg of Fujilite # 10 (described above),
Sabinon P (rust inhibitor) 250g and acrylic cement admixture polymer dispersion (solid content 60%) 2.
A paste obtained by kneading 5 kg and water was used.

Test 1; Rust generation test After the weight of the cured specimen was measured, the temperature was 50.
It was placed in a Franki machine at ℃ and humidity of 90% or higher, and the rusting condition was observed. No rust is generated ◎ Little rust is generated ■ Slight rust is observed △ △ Rust is considerably observed × Rust is significantly observed It was judged as XX (n = 3), and the results are shown in Tables 7-9. As a comparative condition, the specimen was placed in a polystyrene sealed container, and the rusting state was similarly observed in a constant temperature and humidity chamber at 20 ° C. and 65%.

Test 2; Measurement of Moisture Absorption Weight In Test 1 described above, the weight change (g) of the test piece was measured (n = 3) while observing the rust generation state, and the results are shown in Tables 7-9. ..

Test 3; Measurement of Bending Strength After completion of each of the above tests 1 and 2, the bending strength (kg
/ Cm ² ) was measured (n = 3), and the results are shown in Tables 7 to 8. Testing machine: Shimadzu autograph AG5000C crosshead speed 0.5mm / min

Test 4; Measurement of Area of Neutralized Portion After completion of each of the above-mentioned Tests 1, 2 and 3, a 1% solution of phenolphthalein was sprayed on the fractured cross section to measure the area ratio of the neutralized portion. (%) Was measured (n = 3), and the results are shown in Table 7-
8 shows.

[0051]

[Table 7]

[0052]

[Table 8]

[0053]

[Table 9]

4-2 Adhesion of anticorrosion mortar Table 10 shows the composition of anticorrosion mortar (Formulation Example A and Formulation B) and the composition of the mortar of Comparative Formulation Example.

[0055]

[Table 10]

100 g / m ² of the one-component curable resin composition (EX-1500, described above) was applied to a standard mortar base (7 × 7 × 2 cm) specified in JIS A 6916, and 2
After curing in a constant temperature and humidity chamber (20 ° C., 65%), a polymer dispersion for cement admixture with the mortar composition having the above composition (Seelex AF-5000, described above)
30 parts are added, and Architectural Institute of Japan Standard JASS15M-10
The mixture was kneaded with No. 2 and applied to a thickness of 10 mm, and was aged in a constant temperature and constant humidity chamber (20 ° C., 65%) for up to 2 weeks, and an adhesion test was performed. Similarly, a one-pack curable resin composition (EX-15
00, as described above) and curing, and then 2. The cement paste composition used in (Confirmation of base reinforcement effect and adhesion performance of one-component curable resin composition) was applied, and a rust preventive mortar was applied before it was dried to obtain a test sample. The results are shown in Table 11.

[0057]

[Table 11]

4-3 Confirmation of rust preventive performance of rust preventive mortar construction method About 20 years after the casting, the main wall of the exposed concrete is reinforced with rust and the concrete is crushed / missed to expose the rebar. Since there were many places, repair work was performed by the following process. Cleaning the surface of concrete with high-pressure water We removed the rust on the exposed reinforcing bars and peeled off the floating concrete. The one-part curable resin composition (EX-1500, described above) was applied to the concrete defect portion at 150 g / m ² . A cement paste composition having the following formulation was applied to the above-mentioned coated surface. Fujilite # 10 (previously described) 100 parts SBR latex (previously described) 10 parts water 35 parts Anticorrosion mortar (previously described Examples A and B) was applied to the surface of the cement paste composition. After the coating was cured and dried, a mortar composition consisting of Fujilite # 10, Seelex AF5000 (described above) and water was further applied on the entire surface. After carrying out the repair work in this way, there is no abnormality even after one year has passed.

[0059]

As described above, the construction method of the present invention is
It is characterized in that a specific one-part curable resin composition is applied to the repair / repair part of the inorganic cured product, because this one-part curable resin composition is a primer having excellent permeability. The effect of reinforcing the ground surface of the repair surface and repair surface is excellent,
It is possible to improve the adhesive strength of the mortar to be replenished and applied thereafter. In addition, since the above-mentioned one-component curable resin composition has high moisture permeability, moisture inside the repaired surface or repaired surface is not permeated to form condensed water inside. Furthermore, even if a mortar composition containing a rust preventive agent is applied to the surface of the above-mentioned one-component curable resin composition (layer), the diffused rust preventive agent will be transmitted, so that the inside of the repair surface or repair surface The anti-corrosion effect extends to the extent that rusting of corrosive metal materials can be suppressed. Therefore, the construction method of the present invention can protect the steel material such as the skeleton and the lath mortar at the time of repair or repair and improve the durability thereof. Further, the construction method of the present invention can be applied to new construction as well as repair or renovation, and its concrete work is quite the same as ordinary repair and refurbishment work, so it is of extremely high practical value. ..

Further, as a mortar composition to be applied to the surface of the one-component curable resin composition, a mortar composition prepared by mixing an aggregate containing a rust preventive agent and an alkali metal salt in a porous aggregate. Applying a substance prevents the excessive amount of rust preventive agent and alkali metal salt from diffusing and suppresses the outflow of rainwater etc., so the rust preventive effect is prolonged and the use efficiency of the rust preventive agent is improved. As a result, economic efficiency is also improved.

Further, the surface of the above-mentioned aggregate is coated with a mortar composition containing an aggregate coated with cement, or the surface of the mortar composition is further mixed with a cement composition or an anticorrosive agent. By applying the above cement-based composition or the like, the above-mentioned rust preventive effect can be further prolonged.

Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location C04B 41/45 9261-4G

Claims (9)

[Claims] 1. A surface of an inorganic hardened material in which a corrosive metal material is embedded contains 0.5 to 10% by weight of an isocyanate group.
And a hydrolyzable silane group (based on silicon atom)
Contains 0.4 to 7.5% by weight and has a molecular weight of 3000 to 50
A one-component curable resin composition containing a polymer of 000 as a main component is applied to prevent corrosion of the corrosive metal material in the cured inorganic material. 2. Isocyanate groups are contained in an amount of 0.5 to 10% by weight on the surface of a cured inorganic material in which a corrosive metal material is embedded.
And a hydrolyzable silane group (based on silicon atom)
Contains 0.4 to 7.5% by weight and has a molecular weight of 3000 to 50
After coating a one-part curable resin composition containing 000 polymer as a main component, a mortar composition obtained by mixing an aggregate containing a rust preventive agent in a porous aggregate is applied. A method for preventing corrosion of a corrosive metal material in an inorganic cured product, which is characterized in that 3. Isocyanate groups are contained in an amount of 0.5 to 10% by weight on the surface of a cured inorganic material in which a corrosive metal material is embedded.
And a hydrolyzable silane group (based on silicon atom)
Contains 0.4 to 7.5% by weight and has a molecular weight of 3000 to 50
After coating a one-part curable resin composition containing 000 polymer as a main component, a rust preventive agent is incorporated in the porous aggregate,
A method for preventing corrosion of a corrosive metal material in an inorganic hardened material, characterized by applying a mortar composition containing an aggregate whose surface is coated with cement. 4. An isocyanate group is contained in an amount of 0.5 to 10% by weight on the surface of a cured inorganic material in which a corrosive metal material is embedded.
And a hydrolyzable silane group (based on silicon atom)
Contains 0.4 to 7.5% by weight and has a molecular weight of 3000 to 50
After coating a one-part curable resin composition containing 000 polymer as a main component, a rust preventive agent is incorporated in the porous aggregate,
And an inorganic hardening characterized by applying a mortar composition obtained by mixing an aggregate whose surface is coated with cement and an aggregate in which an alkali metal salt is contained in a porous aggregate. A method to prevent corrosive metal materials from rusting. 5. The surface of an inorganic cured material in which a corrosive metal material is embedded contains 0.5 to 10% by weight of an isocyanate group.
And a hydrolyzable silane group (based on silicon atom)
Contains 0.4 to 7.5% by weight and has a molecular weight of 3000 to 50
After coating a one-part curable resin composition containing 000 polymer as a main component, a rust preventive agent is incorporated in the porous aggregate,
Further, a mortar composition is prepared by mixing an aggregate whose surface is coated with cement and an aggregate in which an alkali metal salt is contained in a porous aggregate and whose surface is coated with cement. A method for preventing corrosion of corrosive metal materials in an inorganic hardened material characterized by wearing. 6. A surface of an inorganic cured material in which a corrosive metal material is embedded contains 0.5 to 10% by weight of an isocyanate group.
And a hydrolyzable silane group (based on silicon atom)
Contains 0.4 to 7.5% by weight and has a molecular weight of 3000 to 50
000, a one-component curable resin composition containing a polymer as a main component is applied, and then a mortar composition obtained by mixing an aggregate containing a rust preventive agent in a porous aggregate is applied. Then, a method for rust-preventing a corrosive metal material in an inorganic cured product, characterized by applying a cement-based composition or a cement-based composition mixed with a rust preventive agent. 7. A surface of an inorganic cured material in which a corrosive metal material is embedded contains 0.5 to 10% by weight of an isocyanate group.
And a hydrolyzable silane group (based on silicon atom)
Contains 0.4 to 7.5% by weight and has a molecular weight of 3000 to 50
After coating a one-part curable resin composition containing 000 polymer as a main component, a rust preventive agent is incorporated in the porous aggregate,
And applying a mortar composition containing an aggregate whose surface is coated with cement, and then applying a cement composition containing a cement composition or a rust preventive agent. A method to prevent corrosion of corrosive metal materials in cured inorganic materials. 8. A surface of an inorganic cured material in which a corrosive metal material is embedded contains 0.5 to 10% by weight of an isocyanate group.
And a hydrolyzable silane group (based on silicon atom)
Contains 0.4 to 7.5% by weight and has a molecular weight of 3000 to 50
After coating a one-part curable resin composition containing 000 polymer as a main component, a rust preventive agent is incorporated in the porous aggregate,
And a mortar composition obtained by mixing an aggregate whose surface is coated with cement and an aggregate in which an alkali metal salt is contained in a porous aggregate is applied, and then the cement composition Alternatively, a method for preventing corrosion of a corrosive metal material in an inorganic cured product, which comprises coating a cement composition containing a corrosion inhibitor. 9. An isocyanate group is contained on the surface of an inorganic hardened material in which a corrosive metal material is embedded, in an amount of 0.5 to 10% by weight.
And a hydrolyzable silane group (based on silicon atom)
Contains 0.4 to 7.5% by weight and has a molecular weight of 3000 to 50
After coating a one-part curable resin composition containing 000 polymer as a main component, a rust preventive agent is incorporated in the porous aggregate,
Further, a mortar composition is prepared by mixing an aggregate whose surface is coated with cement and an aggregate in which an alkali metal salt is contained in a porous aggregate and whose surface is coated with cement. A method for preventing corrosion of a corrosive metal material in an inorganic hardened material, which comprises applying a cement composition or a cement composition mixed with a rust preventive agent.