JPH0679986B2 - Method to prevent corrosive metal materials in inorganic hardened materials - Google Patents

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 a steel material such as a skeleton or lath mortar and improving durability during repair or repair. Regarding More specifically, by applying the mortar composition of the present invention to the surface of a concrete having corrosive metal material embedded therein, lightweight cellular concrete (ALC), lath mortar, or the like, or a repaired portion, the water permeability and the water absorption are reduced. And has high moisture permeability,
It is intended to provide a method for rust-preventing a corrosive metal material in an inorganic hardened material, which is capable of imparting an anticorrosive effect and preventing deterioration of the inorganic hardened 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, cracks may occur in the inorganic hardened material due to its volume expansion, 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, the following methods have been disclosed as methods for preventing the corrosive metal material in the above-mentioned cured inorganic material from rusting. JP-A-55-78764 discloses that
A method is described in which the surface of reinforced concrete or an inorganic material is coated and impregnated with a solution of a water-soluble silicate compound and then coated with a cement paste. JP-A-60-2
Japanese Patent No. 04683 describes a method of coating and impregnating the surface of an inorganic material containing a steel material with an aqueous solution of an inorganic salt having a rust preventive effect, and further, a method of overcoating with a cement composition. JP-A-60-231478 discloses a method in which the surface of an inorganic material containing a steel material is coated and impregnated with an aqueous solution of an inorganic salt having an anticorrosive effect, and then an aqueous solution of a water-soluble silicate is applied, and thereafter. , A method of overcoating a cementitious composition, and the like. Japanese Patent Laid-Open No. 62-74090 discloses a method in which the surface of an inorganic material containing a steel material is coated and impregnated with an aqueous solution of an inorganic salt having an anticorrosive effect, and then a silicon-based and / or silane-based primer is overcoated. Furthermore, after that, a method of overcoating with a paint is described. Tokkyo 1-35
Japanese Patent No. 788 describes a rust preventive mortar mixed with lithium silicate and a rust preventive paint. JP-A 1-2
Japanese Unexamined Patent Publication No. 01088 describes a method of coating and impregnating the surface of an inorganic material containing a metal material with an aqueous solution of an inorganic salt and / or a silicate compound, and then coating a treatment agent containing an organic titanate as a main component. ing. JP-A-57-20
In 1444, the glass transition point is 0 on the surface of the building.
A method for forming a coating film containing a synthetic resin at a temperature of 0 ° C. or lower is described. Japanese Patent Laid-Open No. 61-158880 discloses that
A method of applying rust preventive agent mainly composed of polyhydric alcohol nitroester to reinforced concrete, impregnating it, then applying aqueous solution of lithium silicate, and further applying silicon-based penetrating water repellent is described. . JP-A 1-29
Japanese Patent No. 8185 describes a method of coating and impregnating an aqueous solution of lithium silicate from the surface of concrete containing a steel material, and then impregnating an aqueous solution of calcium nitrite, and then a method of coating a cementitious composition. Has been done.

[0003]

However, among the above-mentioned rust-prevention methods (1) to (4),
Either or both of an aqueous solution of a rust preventive such as calcium nitrite and an aqueous solution of an alkali metal salt such as lithium silicate are applied (impregnated) to the surface of the inorganic material, respectively, or thereafter, a cementitious composition In such a method, the coating amount becomes non-uniform and the permeation amount also becomes non-uniform, so that the drug diffusion effect also becomes non-uniform and the rust-preventing effect with time deteriorates. . Further, since the number of processing steps is large, the construction process is complicated and the construction time also becomes long. Furthermore, since the repairing mortar composition has a low moisture permeability, when dew condensation water or the like is generated in the inorganic material, the moisture stays inside without being dissipated to the outside of the inorganic material, and the anticorrosive effect is also halved. In particular,,,
Is overcoated with a silicone-based and / or silane-based primer, a treatment agent containing an organic titanate as a main component, a silicon-based permeation-type water repellent, and a paint, so that the moisture inside the above-mentioned inorganic material does not easily diffuse to the outside. The anticorrosion effect remarkably decreases with time.

Further, the above-mentioned method is to impart a gas barrier property to the surface of a building by forming a synthetic resin coating film, which is inherent in the building, like the above-mentioned items 1 to 3. Moisture is hard to dissipate, so the rust prevention effect is not sufficient.

[0005]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above, and has a particle size of 5 to 0.06 mm and an air-dry bulk specific gravity of 1. A method for preventing corrosion of a corrosive metal material in an inorganic hardened material, characterized in that a mortar composition containing 5 to 0.1 and a water absorption of 500 to 15 wt% is mixed. Is. In addition, a rust preventive agent or an alkali metal salt may be incorporated in the above-mentioned porous aggregate. Further, the surface may be coated with cement.

The above-mentioned porous aggregate used in the present invention is
It has fine pores, has a water absorbing property, and can reduce the water permeability and water absorbing property of the obtained mortar and can improve the moisture permeability.

The particle size of such a porous aggregate is in the range of 5 to 0.06 mm, more preferably 2.5 to 0.1 mm in consideration of the ironing workability.

The air-dry bulk specific gravity is 1.5 to 0.1. When it is 1.5 or more, the impregnation and adsorption capacity of the rust preventive agent becomes low, and the moisture permeability of the obtained mortar deteriorates. On the other hand, when it is 0.1 or less, the strength of the obtained mortar is lowered and the water permeability and water absorption are increased, which is not preferable.

Further, a water absorption rate of 500 to 15 wt% is used. When it is 500 wt% 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. Also, when it becomes 15 wt% or less,
The impregnating and adsorbing ability of the rust preventive agent and the alkali metal salt becomes low, and the moisture permeability of the obtained mortar decreases.

[0010] 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 · mSiO 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 + Al
(OH) ₃ ) granules, granules, diatomaceous earth granulated fired particles, or tuff-based natural glass fired products, rhyolite-based natural glass pumice, calcium silicate crushed particles, expanded glass particles, refractory brick crushed particles, ALC crushed particles etc. can be illustrated.

The mortar composition in the present invention is a mixture of the above-mentioned porous aggregates, has good workability for ironing, has low water permeability and low water absorbency, and intrudes water from the outside, such as rainwater. Since it suppresses the infiltration of corrosive metal, it is possible to prevent corrosion of corrosive metal materials such as steel materials such as reinforcing bars and lath mortar. Furthermore, the mortar composition of the present invention has a high moisture permeability and does not allow water to stay inside the cured inorganic material obtained by curing the mortar composition, so that the formation of mold and rust can be prevented.

The rust preventive used in the present invention is JIS
A 6205 “Rustproofing agent for reinforced concrete” may be used, and examples thereof include nitrites such as calcium nitrite and sodium nitrite, pyroxyethylene bisglycerol porate, and polyoxyethylene bisglycerol. Examples thereof include borate esters such as polate and oleate, and organic carboxylic acid salt-based compounds.

To incorporate the rust preventive agent as described above into the porous aggregate as described above, an aqueous solution of the rust preventive agent is added to the porous aggregate to absorb water and then dried to remove water. For example, the porous aggregate may be impregnated with an aqueous solution of a rust preventive agent to absorb water sufficiently, and then dried with air.

The aggregate thus produced can be appropriately mixed with other commonly used aggregates and blended into the mortar composition. The inorganic cured (molded) product obtained by curing this mortar composition has a rust preventive agent uniformly dispersed and mixed, and this rust preventive agent gradually dissolves in trace amounts to provide a rust preventive effect over a long period of time. Demonstrate. Therefore, when the above-mentioned mortar composition is applied to the surface of an existing inorganic cured (molded) article, the rust preventive agent diffuses and penetrates into the existing inorganic cured (molded) article, so that deterioration of the rust preventive agent is prevented. It can be prevented over a long period of time.

Cement may be coated on the surface of the above-mentioned aggregate to be hardened and granulated. As the above-mentioned cement, for example, 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 porous aggregate can be covered 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. .

Further, instead of the above-mentioned rust preventive agent, a mortar composition containing an aggregate in which an alkali metal salt such as lithium silicate or lithium nitrite is incorporated in a porous aggregate is applied. You can The aggregate in which the alkali metal salt is incorporated in the porous aggregate can be prepared by adding an aqueous solution of the alkali metal salt to the porous aggregate to absorb water, and then drying and evaporating the water content. it can.
Alternatively, an aqueous solution of an alkali metal salt may be added to the porous aggregate to absorb water, and then the surface of the aggregate may be coated with cement without being dried to be hardened and granulated.

When an aggregate containing such an alkali metal salt is mixed into a mortar composition and cured, the alkali metal salt gradually dissolves in minute amounts, and an inorganic hardened (molded) product is formed over a long period of time. Can be made alkaline and rustproof. Therefore, when the above-mentioned mortar composition is applied to the surface of an existing inorganic cured (molded) article, the alkali metal salt diffuses and permeates into the existing inorganic cured (molded) article, so that the deterioration thereof is prevented. It can be prevented over a long period of time.

According to the present invention, the surface of the inorganic hardened material in which the corrosive metal material is embedded is coated with the mortar composition containing the porous aggregate whose particle size, bulk density and water absorption are limited as described above. This prevents water from entering from the outside and prevents water from staying inside, so it is possible to prevent the development of mold and rust, but as mentioned above, a rust inhibitor or alkali metal salt is built in. By compounding the above-mentioned porous aggregate, it is possible to further improve the rust preventive effect and prevent deterioration of the inorganic cured product over a long period of time. Incidentally, the mortar composition in the present invention described above, the particle size and bulk density, porous aggregate with limited water absorption rate, porous aggregate containing a rust inhibitor, porous bone containing an alkali metal salt. One or more of a porous aggregate in which a material, a rust preventive agent is incorporated and the surface thereof is coated with cement, and an alkaline metal salt is incorporated and the surface of which is coated with cement. It is characterized by being mixed.

In the present invention, the above-mentioned mortar composition may be directly applied to the surface of the cured inorganic material, but cement paste may be applied first as an undercoat material. As described above, when the cement paste is undercoated, the adhesiveness of the mortar composition in the present invention can be improved and stabilized, and the high alkalinity of the cement paste can also improve the rust preventive effect of the corrosive metal material. . Further, in this case, the adhesiveness is further stabilized by mixing the cement mixing polymer dispersion into the cement paste. As described above, the cement dispersion polymer dispersion may be used for the purpose of stabilizing the adhesive property as long as the moisture permeability of the mortar composition of the present invention is not deteriorated.

As the above-mentioned cement paste, Portland cement, Portland-based mixed cement, etc. can be used, and an appropriate amount of water is added thereto, and the mixture is kneaded into a paste to improve workability. You may mix a sticky agent and a fine aggregate. On the other hand, the amount of the cement-mixing polymer dispersion to be mixed cannot be limited depending on the type of the dispersion, but 0.5 to 30% of solid content should be mixed into the powder before use. The polymer dispersion for admixing cement is not particularly limited as long as it does not cause abnormalities when mixed with cement and has a sufficient starting time, acrylic resin emulsion, ethylene-vinyl acetate copolymer type Emulsion, multi-component synthetic resin emulsion consisting of ethylene, vinyl acetate, styrene type, acrylic acid ester type, SBR latex, epoxy resin emulsion and the like are suitable.

[0021] In particular, for a corrosive metal material portion or a structure having a high chlorine ion concentration, cement paste may be used in accordance with JIS.
The rust preventive effect is further improved by mixing the rust preventive agent specified in A6205.

In the mortar composition of the present invention,
When a porous aggregate containing a rust preventive agent or an alkali metal salt is blended as described above, this rust preventive agent or alkali metal salt is dissolved and diffused in trace amounts, and the Diffusion rates are enhanced and some can be washed away by water. Therefore, after applying the mortar composition in the present invention, by applying a cementitious composition as an overcoat material, to suppress the diffusion and outflow of the above-mentioned rust preventive agent and alkali metal salt, for a long period of time, The effect can be continued.

The above-mentioned cement-based composition is a mixture of Portland cement, white cement, Portland-based cement, etc. with fine aggregate, inorganic admixture, dispersant, 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-mixing polymer dispersion may be mixed to the extent that the moisture permeability is not impaired. As the above-mentioned polymer dispersion for admixing cement, acrylic resin emulsion, ethylene / vinyl acetate copolymer emulsion, ethylene, vinyl acetate, styrene,
A multi-component synthetic resin emulsion made of acrylic acid ester, SBR latex, epoxy resin emulsion and the like are suitable.

Further, in the above cement-based composition for top coating, the same as the above-mentioned cement paste for bottom coating,
The rust preventive effect is further improved by mixing the rust preventive agent.

[0025]

EXAMPLES Examples of the present invention will be shown below. Mixing Examples 1 to 4 Using the porous aggregate of Table 1, the repairing and repairing mortar compositions having the mixing composition shown in Table 2 were named as Mixing Examples 1 to 4, respectively.

Comparative Examples 1 and 2 A mortar composition for repair / repair having the composition shown in Table 2 was prepared.
Comparative examples 1 and 2 were used.

[0027]

[Table 1]

[0028]

[Table 2]

Test 1; Measurement of Bending Strength A test sample was prepared according to the quality standards of JASS 15M-102 pre-mixed cement mortar of the Japanese Society of Architectural Standards with the above-mentioned composition examples 1 to 4 and Comparative Example 1 to obtain the bending strength. (Kg / cm ² ) was measured (n = 3), and the results are shown in Table 3. Testing machine: Shimadzu autograph AG5000C crosshead speed 0.5mm / min

Test 2; Measurement of Water Absorption A test sample was prepared according to the quality standards of the JAS 15M-102 pre-mixed cement mortar of the Japanese Society of Architectural Standards with the above-mentioned composition examples 1 to 4 and Comparative Example 1, and the water absorption was measured. (G) was measured (n = 3), and the results are shown in Table 3.

Test 3; Measurement of water permeation amount The test of the composition of Examples 2 and 4 and Comparative Example 1 with a diameter of 75 mm and a thickness of 20 mm according to the quality standard of JASS 15M-102 pre-mixed cement mortar of the Japanese Society of Architectural Standards. Each sample was prepared, and the water permeation amount (ml) was measured (n = 3), and the results are shown in Table 3. In addition, formulation example 2,
The surface of the mortar 4 was ordinary Portland cement ... 78.5% Fine aggregate (my car) ... 21.4% Metroses (thickener) ... 0.1% cement-based composition A was overcoated, Evaluations (n = 3) were made as formulation examples 2-A and 4-A, respectively, and the results are shown in Table 3.

[0032]

[Table 3]

Test 4; Moisture Permeability Test A diameter of 108 m was obtained with the above-mentioned compounding examples 1 to 4 and comparative example 2.
A test sample having a thickness of 20 mm and a thickness of 20 mm was prepared and aged in a constant temperature and humidity chamber at a temperature of 20 ° C. and a humidity of 65% for 28 days. Tap water of 50 g is put on the bottom of a cup having a diameter of 108 mm and a depth of 65 mm, a test sample is set on the upper end of the cup, and the test sample and the upper edge of the cup are completely sealed with a paraffin sheet and the temperature is 20 ° C. Humidity 65
% In a constant temperature and humidity chamber and measure the weight change (n = 3),
The results are shown in Fig. 1.

Next, the surface of the mortar of formulation examples 1, 2 and 4 was overcoated with the above-mentioned cementitious composition A,
Evaluated as formulation examples 1-A, 2-A, and 4-A (n
= 3), and the results are shown in FIG.

Further, 6.6% of the polymer dispersion for admixing acrylic cement (solid content 60%) was blended with the ordinary Portland cement in the blending example 2 to prepare a test sample, and blending example 2-B. A cement composition in which 25% of an acrylic cement admixture polymer dispersion (solid content 60%) with respect to the mortar composition powder of the cement composition A described above is mixed on the surface of the mortar of the formulation example 2. Compound C overcoated with Material C 2-C
And the surface of the mortar of the above-mentioned formulation example 2-B is overcoated with the above-mentioned cementitious composition C.
It was evaluated as D (n = 3), and the results are shown in FIG.

Further, 6.6% of the polymer dispersion for admixing acrylic cement (solid content 60%) was blended with the ordinary Portland cement in Blending Example 4 to prepare a test sample, and Blending Example 4-B. And a cement composition in which 25% of an acrylic cement admixture polymer dispersion (solid content 60%) is mixed with the mortar composition powder of the cement composition A described above on the surface of the mortar of the formulation example 4. Compound C overcoated with Material C 4-
C and the surface of the mortar of the above-mentioned formulation example 4-B is overcoated with the above-mentioned cementitious composition C.
It evaluated as -D (n = 3) and the result was shown in FIG.

In consideration of the results of the above-mentioned moisture permeability test, the moisture permeability was calculated by the formula 1 and shown in Table 4.

[Equation 1]

[0038]

[Table 4]

Aggregate A: 6.9 g of sabinone P (rust preventive, manufactured by Kirest Chemical Co., Ltd.) is added to 120 cc of tap water, 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 placed in a dryer at 50 ° C. and dried.

Aggregate B: 13.8 g of sabinone P (rust preventive agent) is added to 120 cc of tap water, and sufficiently stirred to dissolve. Next, zeolite 1
58 g of 014 (porous aggregate) and 229 g of zeolite 1424 (porous aggregate) are added and sufficiently stirred to absorb water, and then placed in a dryer at 50 ° C. to dry.

Aggregate C: 6.9 g of sabinone P (antirust agent) is added to 120 cc of tap water, and sufficiently stirred to dissolve. Next, zeolite 10
After adding 58 g of 14 (porous aggregate) and 229 g of zeolite 1424 (porous aggregate) and stirring them sufficiently to absorb water, 140 g of ordinary Portland cement is added and stirred to carry out adhesion granulation. This is cured at 20 ° C. and 65% for 48 hours, and then put in a dryer at 50 ° C. to be dried.

Aggregate D: 13.8 g of sabinone P (rust preventive agent) is added to 120 cc of tap water, and sufficiently stirred to dissolve. Next, zeolite 1
58 g of 014 (porous aggregate) and 229 g of zeolite 1424 (porous aggregate) are sufficiently stirred and allowed to absorb water, then 140 g of ordinary Portland cement is added and stirred to carry out adhesion granulation. This is cured at 20 ° C. and 65% for 48 hours, and then put in a dryer at 50 ° C. to be dried.

Aggregate E: 6.9 g of sabinone P (rust inhibitor) is added to 200 cc of tap water, and sufficiently stirred 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,
Ordinary Portland cement (200 g) is added and stirred to adhere and granulate. This is cured at 20 ° C. and 65% for 48 hours, and then put in a dryer at 50 ° C. to be dried.

Aggregate F: 13.8 g of sabinone P (rust inhibitor) is added to 200 cc of tap water, and sufficiently stirred to dissolve. Next is Isolite 1
No. 18 (porous aggregate) and Isolite No. 2 (porous aggregate) 168 g were added and sufficiently stirred to absorb water. Then, 200 g of ordinary Portland cement was added and stirred to carry out adhesion granulation. This is cured at 20 ° C. and 65% for 48 hours, and then put in a dryer at 50 ° C. to be dried.

Aggregate G: 20.7 g of sabinone P (rust inhibitor) is added to 200 cc of tap water, and sufficiently stirred to dissolve. Next is Isolite 1
No. 18 (porous aggregate) and Isolite No. 2 (porous aggregate) 168 g were added and sufficiently stirred to absorb water. Then, 200 g of ordinary Portland cement was added and stirred to carry out adhesion granulation. This is cured at 20 ° C. and 65% for 48 hours, and then put in a dryer at 50 ° C. to be dried.

Aggregate H: 110 g of LINI-25 (lithium nitrite aqueous solution, manufactured by Nissan Chemical Industries, Ltd.) was added to 100 cc of tap water, and sufficiently stirred and dissolved. Next, Isolite No. 1 (porous aggregate) 188.2 g, Isolite No. 2 (porous aggregate) 1
After 68 g is added and sufficiently stirred to absorb water, it is put in a dryer at 50 ° C. to be dried.

Aggregate I: 110 g of LINI-25 (lithium nitrite aqueous solution) was added to 100 cc of tap water, and sufficiently stirred 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, then 200 g of ordinary Portland cement
Add and stir to adhere and granulate. This is 20 ℃, 65%
After curing at 48 ° C. for 48 hours, put in a dryer at 50 ° C. to dry.

Aggregate J: 110 g of ZOL-510 (lithium silicate aqueous solution, manufactured by Nissan Chemical Industries, Ltd.) is added to 100 cc of tap water, and sufficiently stirred to dissolve. Next, Isolite No. 1 (porous aggregate) 188.2 g, Isolite No. 2 (porous aggregate) 1
After 68 g is added and sufficiently stirred to absorb water, it is put in a dryer at 50 ° C. to be dried.

Aggregate K: 110 g of ZOL-510 (lithium silicate aqueous solution) is added to 100 cc of tap water, and sufficiently stirred 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, then 200 g of ordinary Portland cement
Add and stir to adhere and granulate. This is 20 ℃, 65%
After curing at 48 ° C. for 48 hours, put in a dryer at 50 ° C. to dry.

Mixing Examples 5 to 16 Using the above-mentioned aggregates A to K, the mortar compositions for repairing and repairing the blending compositions in Tables 5 and 6 were mixed and adjusted to give Mixing Examples 5 to 16, respectively.

Comparative Examples 3 to 7 The mortar compositions for repair / repair having the blending compositions shown in Tables 5 and 6 were mixed and adjusted without using Aggregates A to K to give Comparative Examples 3 to 7, respectively.

[0052]

[Table 5]

[0053]

[Table 6]

Specimen 1; The mortar compositions of the above-mentioned formulation examples 5 to 16 and comparative examples 3 to 7 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 4 ×. 4x16c
It is put in a m-frame and molded. This is temperature 20 ℃, humidity 8
After curing at 0% or more for 48 hours in moist air, demolding, temperature 20
Specimen 1 was aged in a thermo-hygrostat at a temperature of 65% and a humidity of 65% for up to 2 weeks.

Specimen 2; Specimen 2 was prepared under the same conditions as Specimen 1 described above except that the specimen 2 was molded to 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 aged in a constant temperature and humidity chamber at a temperature of 20 ° C. and a humidity of 65% for up to 2 weeks. And designated as Specimen 3.
The above cement-based composition is Fujilite # 10.
25 kg (manufactured by Fujikawa Kenzai Kogyo Co., Ltd.) and a polymer dispersion for admixing acrylic cement (solid content 60
%) 2.5 kg and water were kneaded in a paste form.

Specimen 4; Specimen 4 was prepared under the same conditions as for specimen 3, except that the cementitious composition containing a rust preventive was overcoated.
The above cement composition containing a rust preventive agent is 25 kg of Fujilite # 10 (manufactured by Fujikawa Kenzai Kogyo Co., Ltd.), 250 g of Cabinone P (rust preventive agent), and an acrylic cement admixture polymer dispersion (solid content). 60%) 2.5
A paste prepared by kneading kg and water was used.

Test 5: Rust generation test After the weight of the cured specimen was measured, the temperature was 50.
It was placed in a Franki machine that was kept at ℃ and humidity of 90% or more, and the state of rust was observed. No rust is generated ◎ Little rust is generated ■ Little rust is observed △ △ Rust is significantly observed × Rust is significantly observed It was judged as XX (n = 3), and the results are shown in Tables 7-9. As a comparison condition, the specimen was put in a polystyrene hermetic container, and the rust generation state was similarly observed in a constant temperature and humidity chamber at 20 ° C. and 65%.

Test 6; Measurement of Moisture Absorption Weight In Test 5 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 7: Measurement of flexural strength After completion of each of the above tests 5 and 6, the flexural 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 8: Measurement of area of neutralized portion After completion of each of the above-mentioned tests 5, 6, and 7, 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.

[0062]

[Table 7]

[0063]

[Table 8]

[0064]

[Table 9]

[0065]

As described above, the method of preventing corrosion of the corrosive metal material in the cured inorganic material of the present invention is based on the particle size and the air-dry bulk specific gravity of the repaired / repaired portion of the existing cured inorganic material (molding). By applying a mortar composition containing a porous material having a limited water absorption rate, the amount of water permeation and the amount of water absorption are small,
In addition, since it has high moisture permeability and also imparts a rust preventive effect, it is possible to suppress the intrusion of water from the outside, prevent the moisture in the inside from staying, and prevent the generation of mold and rust. Further, in the construction method of the present invention, when a mortar composition containing a porous aggregate containing a rust preventive agent or an alkali metal salt is used,
It is possible to prevent deterioration of the inorganic cured product over an extremely long period of time. Further, when a mortar composition containing a rust preventive agent or an alkali metal salt and having a porous aggregate coated with cement on its surface is applied, the above rust preventive effect can be further prolonged. . Therefore, the construction method of the present invention can protect the steel material such as the skeleton and the lath mortar and improve the durability thereof during repair or repair. Further, before applying the mortar composition as described above, by undercoating the cement paste, it is possible to improve and stabilize the adhesiveness of the mortar composition,
Due to the high alkalinity of the cement paste, the anticorrosion effect of the reinforcing bar can be improved. Furthermore, after applying the mortar composition and then overcoating the cement-based composition, the diffusion and the outflow of the rust preventive agent and the alkali metal salt in the mortar composition are suppressed, and the effect is continued for a long time. Can be made. In addition, the construction method of the present invention, even in new construction,
It can also be applied to repair or repair, and its concrete work is of very high practical value because it is completely the same as normal repair / repair work.

[Brief description of drawings]

FIG. 1 is a graph showing the results of moisture permeability tests of formulation examples of the present invention.

FIG. 2 is a graph showing the results of a moisture permeability test of another formulation example of the present invention.

FIG. 3 is a graph showing the results of a moisture permeability test of another formulation example of the present invention.

FIG. 4 is a graph showing the results of a moisture permeability test of another formulation example of the present invention.

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Claims (12)

[Claims] 1. A surface of an inorganic cured material in which a corrosive metal material is embedded has a particle size of 5 to 0.06 mm and an air-dry bulk specific gravity of 1.
A method for preventing corrosion of a corrosive metal material in an inorganic cured product, which comprises applying a mortar composition containing a porous aggregate having a water absorption of 5 to 0.1 and a water absorption of 500 to 15 wt%. 2. The porous aggregate according to claim 1 has a rust preventive agent or an alkali metal salt incorporated therein to prevent corrosion of a corrosive metal material in an inorganic cured product. Construction method. 3. A cured inorganic material characterized in that the porous aggregate according to claim 1 contains a rust preventive agent or an alkali metal salt, and the surface thereof is coated with cement. Method to prevent rusting of corrosive metal materials of. 4. A particle size of 5 to 0.06 mm and an air-dry bulk specific gravity of 1. on the surface of an inorganic hardened material in which a corrosive metal material is embedded.
After applying a mortar composition containing 5 to 0.1 and a water absorption of 500 to 15 wt% porous aggregate, a cement composition or a cement composition mixed with a rust preventive agent is applied. A method for preventing corrosion of a corrosive metal material in an inorganic cured product, which is characterized in that 5. The porous aggregate according to claim 4 has a rust preventive agent or an alkali metal salt incorporated therein to prevent corrosion of a corrosive metal material in an inorganic hardened material. Construction method. 6. A cured inorganic material characterized in that the porous aggregate according to claim 4 contains a rust preventive agent or an alkali metal salt, and the surface thereof is coated with cement. Method to prevent rusting of corrosive metal materials of. 7. A particle size of 5 after a cement paste is applied to the surface of an inorganic hardened material in which a corrosive metal material is embedded.
~ 0.06mm, air-dry bulk density 1.5-0.1, water absorption 5
A method for preventing corrosion of a corrosive metal material in an inorganic cured product, which comprises applying a mortar composition containing 0 to 15 wt% of a porous aggregate. 8. The porous aggregate according to claim 7 has a rust preventive agent or an alkali metal salt incorporated therein to prevent corrosion of a corrosive metal material in an inorganic cured product. Construction method. 9. A cured inorganic material characterized in that the porous aggregate according to claim 7 contains a rust preventive agent or an alkali metal salt, and the surface thereof is coated with cement. Method to prevent rusting of corrosive metal materials of. 10. A cement paste is applied to the surface of an inorganic hardened material in which a corrosive metal material is embedded, and then the particle size is 5 to 0.06 mm, the air-dry bulk specific gravity is 1.5 to 0.1, and the water absorption rate is 500 to. Corrosion in a cured inorganic material, characterized by applying a mortar composition containing 15 wt% of a porous aggregate, and further applying a cement composition or a cement composition mixed with a rust preventive agent. A method of rustproofing metallic materials. 11. The porous aggregate according to claim 10 has a rust preventive agent or an alkali metal salt incorporated therein to prevent corrosion of a corrosive metal material in an inorganic cured product. Construction method. 12. A cured inorganic material characterized in that the porous aggregate according to claim 10 contains a rust preventive agent or an alkali metal salt, and the surface thereof is coated with cement. Method to prevent rusting of corrosive metal materials of.