JPH0679985B2 - 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, a mortar composition containing an anti-corrosion agent or an aggregate containing an alkali metal salt is applied to the surface or a repaired part of concrete, lightweight aerated concrete (ALC), lath mortar, etc. in which a corrosive metal material is embedded. An inorganic hardened material that can be prevented from deteriorating the inorganic hardened material by rust-preventing agent or alkali metal salt in the aggregate to prevent the corrosive metal material from rusting over a long period of time. It is intended to provide a method for preventing corrosion of the corrosive metal material inside.

[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]

DISCLOSURE OF THE INVENTION The present invention has been proposed in view of the above, in which a rust preventive agent is incorporated in a porous aggregate on the surface of a cured inorganic material in which a corrosive metal material is embedded. The present invention relates to a method for preventing corrosion of a corrosive metal material in an inorganic hardened material, which is characterized in that a mortar composition containing an aggregate is applied. Further, the present invention may use an aggregate in which an alkali metal salt is incorporated in a porous aggregate together with the above-mentioned aggregate, that is, a rust preventive agent and an alkali metal salt in the porous aggregate. You may make it apply | coat the mortar composition which mix | blended the aggregate in which the.

The above-mentioned porous aggregate used in the present invention is
Any material may be used as long as it has fine pores and has a water absorbing property, and the material and properties 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 the 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.
It is sufficient to use one having a range of 5 to 0.1 mm. Also,
The air-dry bulk density may be 1.5 to 0.1. When 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 is lowered. On the other hand, if it is 0.1 or less, the strength of the obtained inorganic cured product decreases, and the water permeability and water absorption increase, which is not preferable. Further, the water absorption rate may be 500 to 15 wt%. 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. 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 becomes low, 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 · ySiO 2 ·} zH crushed granules ₂ O), granulation, granulating pellets products, granulated granules, allophane (Allo
phane, natural silica-alumina gel, Al ₂ O ₃ · mSi
O ₂ · nH ₂ O + Al (OH) ₃ ) granules, granules,
Examples include diatomaceous earth granulated fired particles, tuff-based natural glass fired products, rhyolite-based natural glass pumice, calcium silicate crushed particles, foamed glass particles, refractory brick crushed particles, and ALC crushed particles.

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.

In order 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. Can be prevented.

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, for example, an aggregate in which an alkali metal salt such as lithium silicate or lithium nitrite is incorporated in a porous aggregate may be mixed in the mortar composition. good. 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 blended in a mortar composition, the alkali metal salt gradually dissolves in trace amounts, making the inorganic hardened material alkaline over a long period of time and preventing rust. be able to. Therefore, when the above-mentioned mortar composition is applied to the surface of an existing inorganic cured (molded) product, the alkali metal salt diffuses and penetrates into the existing inorganic cured (molded) product. The conversion speed can be delayed.

According to the present invention, a mortar composition containing an aggregate containing a rust preventive agent or an aggregate containing a rust preventive agent and the surface of which is coated with cement is used. Although it is to be applied to the surface of the embedded inorganic hardened material, it further contains an aggregate containing an alkali metal salt or an aggregate containing an alkali metal salt and the surface of which is coated with cement. May be mixed and applied, and the deterioration of the inorganic cured product can be prevented more effectively.

The present invention, as described above, uses a rust preventive agent,
A mortar composition containing an aggregate containing an alkali metal salt may be directly applied to the surface of the cured inorganic material,
Cement paste may be applied as an undercoat material. As described above, when the cement paste is undercoated, the adhesiveness of the mortar composition in the present invention is improved,
It can be stabilized, and the highly alkaline nature of the cement paste can also improve the anticorrosion effect of the reinforcing bars.
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 the 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.

In particular, for a corrosive metal material part or a structure having a high chloride ion concentration, JIS paste may be used.
The rust preventive effect is further improved by mixing the rust preventive agent specified in A6205.

The mortar composition of the present invention contains an aggregate containing a rust preventive agent and an alkali metal salt as described above. It gradually dissolves and diffuses, and water from the surface accelerates its diffusion rate, and some may 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 means Portland cement, white cement, Portland-based mixed cement, etc., 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-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.

[0020]

EXAMPLES Examples of the present invention will be shown below. First, the aggregates A to K were manufactured as follows. The porous aggregate used was as shown in Table 1 below.

[0021]

[Table 1]

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) 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) 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 preventive agent) 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 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 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 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 2 and 3 were mixed and adjusted.

Comparative Examples 1 to 5 The mortar compositions for repair / repair having the blend compositions shown in Tables 2 and 3 were mixed and adjusted without using the aggregates A to K.

[0035]

[Table 2]

[0036]

[Table 3]

Specimen 1; The repairing / repairing mortar compositions of the above-mentioned formulation examples 1-12 and comparative examples 1-5 were prepared according to the Japanese Society of Architectural Standard JASS 15M-.
Knead with the amount of water shown in Tables 2 and 3 by 102, and
It is put in a mold of × 4 × 16 cm and molded. This is temperature 2
After curing in a humid air at 0 ° C. and a humidity of 80% or more for 48 hours, the mold was removed, and the sample was cured in a constant temperature and humidity room at a temperature of 20 ° C. and a humidity of 65% for 2 weeks.

Specimen 2; Specimen 2 was prepared under the same conditions as specimen 1 described above except that the specimen 2 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 room at a temperature of 20 ° C. and a humidity of 65% for up to 2 weeks. And designated as Specimen 3. Two days before the completion of curing, epoxy resin paint was applied to the side surface to seal it. In addition, the above-mentioned cement composition was made into a paste form with 25 kg of Fujilite # 10 (manufactured by Fujikawa Kenzai Kogyo Co., Ltd.), 2.5 kg of a polymer dispersion for acrylic cement admixture (solid content 60%), and water. The kneaded one was used.

Specimen 4; Specimen 4 was prepared under the same conditions as Specimen 3 described above except that the cement composition containing the rust preventive agent was overcoated. The cement composition containing the rust preventive agent is 25 kg of Fujilite # 10 (manufactured by Fujikawa Construction Materials Co., Ltd.) and 250 g of SAVINON P (rust preventive agent).
Then, 2.5 kg of a polymer dispersion for admixing acrylic cement (solid content 60%) and water were kneaded in a paste form.

Test 1: Rust generation test After measuring the weight of the cured specimen, the temperature was set to 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 4 to 6. 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 2; Measurement of Moisture Absorption Weight In Test 1 described above, the weight change (g) of the sample was measured (n = 3) while observing the rust generation state, and the results are shown in Tables 4 to 6. .

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 4-5. 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 4 to
5 shows.

[0045]

[Table 4]

[0046]

[Table 5]

[0047]

[Table 6]

[0048]

As described above, the method of rust-preventing the corrosive metal material in the inorganic cured product of the present invention is the rust preventive agent or the alkali in the repair / repair portion of the existing inorganic cured (molded) product. By applying a mortar composition containing a metal salt, the rust preventive agent and alkali metal salt diffuse and spread inside the composition.
Since it permeates, it is possible to prevent deterioration of the existing inorganic cured (molded) product over a long period of time. That is, the method of the present invention can prevent the deterioration of the inorganic cured product for an extremely long period of time, as compared with a method in which a rust preventive agent and an alkali metal salt are simply mixed and applied in a mortar composition. it can. In addition, when a mortar composition containing a rust preventive agent and an alkali metal salt and having the surface thereof coated with cement is applied, the rust preventive effect described above 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, by undercoating the cement paste, it is possible to improve and stabilize the adhesiveness of the mortar composition, it is also possible to improve the anticorrosion effect of the reinforcing bar due to the high alkalinity of the cement paste. it can. 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 can be applied to new construction as well as repair or renovation, and its specific work is quite the same as ordinary repair and refurbishment work, so it is of extremely high practical value. is there.

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Claims (16)

[Claims] 1. A mortar composition comprising a porous aggregate and an aggregate having a rust preventive incorporated therein is applied to the surface of a cured inorganic material in which a corrosive metal material is embedded. A method to prevent rusting of corrosive metal materials in the characteristic cured inorganic material. 2. An inorganic hardened material in which a corrosive metal material is embedded, is mixed with an aggregate in which a rust preventive agent is incorporated in a porous aggregate and the surface of which is coated with cement. A method for preventing corrosion of a corrosive metal material in an inorganic cured product, characterized by applying a mortar composition. 3. An aggregate in which a rust preventive agent is contained in a porous aggregate on the surface of an inorganic hardened material in which a corrosive metal material is embedded, and the surface is coated with cement, and a porous bone. A method for preventing corrosion of a corrosive metal material in an inorganic hardened material, which comprises applying a mortar composition prepared by mixing an aggregate containing an alkali metal salt in the material. 4. An aggregate in which a rust preventive agent is incorporated in a porous aggregate on the surface of a cured inorganic material in which a corrosive metal material is embedded, and the surface of which is coated with cement, and a porous bone. A corrosive metal material in a cured inorganic material, characterized in that a mortar composition obtained by mixing an aggregate containing an alkali metal salt in the material and the surface of which is coated with cement is applied. Construction method to prevent rust. 5. A mortar composition obtained by coating an aggregate of an inorganic hardened material in which a corrosive metal material is embedded with an aggregate in which a rust preventive is incorporated in a porous aggregate is applied. A method for preventing corrosion of a corrosive metal material in a cured inorganic material, characterized by applying a cement composition or a cement composition mixed with a rust preventive agent. 6. An aggregate in which a rust preventive agent is incorporated in a porous aggregate and the surface of which is coated with cement is compounded on the surface of an inorganic hardened material in which a corrosive metal material is embedded. A method for preventing corrosion of a corrosive metal material in an inorganic cured product, which comprises applying a cement composition or a cement composition mixed with a rust preventive agent after applying a mortar composition. 7. An aggregate in which a rust preventive agent is incorporated in a porous aggregate on the surface of an inorganic hardened material in which a corrosive metal material is embedded, and the surface of which is coated with cement, and a porous bone. Characterized by applying a cement composition or a cement composition mixed with a rust preventive agent after applying a mortar composition prepared by mixing an aggregate containing an alkali metal salt in the material A method to prevent corrosion of corrosive metal materials in inorganic cured products. 8. An aggregate in which a rust preventive agent is incorporated in a porous aggregate on the surface of an inorganic hardened material in which a corrosive metal material is embedded, and the surface of which is coated with cement, and a porous bone. Cement containing a cement composition or a rust preventive agent after applying a mortar composition in which an alkali metal salt is embedded in the material and an aggregate whose surface is covered with cement A method for preventing corrosion of a corrosive metal material in an inorganic cured product, characterized by applying a system composition. 9. A mortar composition obtained by applying cement paste to the surface of an inorganic hardened material in which a corrosive metal material is embedded, and then incorporating an aggregate containing a rust preventive agent in the porous aggregate. A method for preventing corrosion of a corrosive metal material in an inorganic cured product, which is characterized by applying a substance. 10. A surface of an inorganic hardened material in which a corrosive metal material is embedded is coated with a cement paste, and then a rust preventive agent is incorporated in the porous aggregate and the surface is coated with cement. A method for preventing corrosion of a corrosive metal material in an inorganic hardened material, characterized by applying a mortar composition containing an aggregate. 11. A surface of an inorganic hardened material in which a corrosive metal material is embedded is coated with a cement paste, and then a rust preventive agent is incorporated in the porous aggregate, and the surface is coated with cement. Corrosion-preventing corrosive metal material in an inorganic hardened material characterized by applying a mortar composition prepared by mixing aggregate and aggregate in which an alkali metal salt is incorporated in porous aggregate Construction method. 12. A cement paste is applied to the surface of an inorganic hardened material in which a corrosive metal material is embedded, and then a rust preventive agent is incorporated in the porous aggregate and the surface is covered with cement. A cured inorganic material characterized by applying a mortar composition obtained by mixing an aggregate and an aggregate in which an alkali metal salt is contained in a porous aggregate and the surface of which is coated with cement. A method to prevent the corrosive metal materials inside from rusting. 13. A mortar composition obtained by applying cement paste to the surface of an inorganic hardened material in which a corrosive metal material is embedded, and then mixing an aggregate containing a rust preventive agent in the porous aggregate. A method for rust-proofing a corrosive metal material in an inorganic cured product, which comprises applying a cement-based composition or a cement-based composition mixed with a rust preventive agent. 14. A surface of an inorganic hardened material in which a corrosive metal material is embedded is coated with a cement paste, and then a rust preventive agent is incorporated in the porous aggregate and the surface thereof is coated with cement. A mortar composition containing an aggregate is applied, and a cement-based composition or a cement-based composition mixed with a rust preventive agent is applied to prevent corrosive metal materials in a cured inorganic material. The method of rusting. 15. A surface of an inorganic hardened material in which a corrosive metal material is embedded is coated with a cement paste, and then a rust preventive agent is incorporated in the porous aggregate and the surface is coated with cement. Cement-based composition in which a mortar composition obtained by mixing an aggregate and an aggregate in which an alkali metal salt is contained in a porous aggregate is applied, and further a cement-based composition or a rust preventive agent is mixed. A method for preventing corrosion of a corrosive metal material in an inorganic cured product, which is characterized by applying. 16. A cement paste is applied to the surface of an inorganic hardened material in which a corrosive metal material is embedded, and then a rust preventive agent is incorporated in the porous aggregate and the surface is coated with cement. A mortar composition comprising an aggregate and an aggregate in which an alkali metal salt is contained in a porous aggregate and the surface of which is coated with cement is applied, and a cement-based composition or a protective composition A method for preventing corrosion of a corrosive metal material in an inorganic hardened material, characterized by applying a cement composition containing a rust agent.