JPH07106936B2 - Mortar composition for repair and repair - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mortar composition which can be used as a repair material, a repair material, a lath mortar or the like to protect a steel material such as a skeleton or a lath mortar and to improve durability. . More specifically, the mortar composition of the present invention is prepared by adding a corrosive metal material to concrete or lightweight cellular concrete (AL
C) or lath mortar, etc., or by using it on the surface of an existing inorganic cured (molded) or a refurbished part, has low water permeation and absorption, high moisture permeability, and rust prevention effect. The present invention provides a mortar composition which is applied to prevent deterioration of an inorganic cured product.

[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 a cementitious composition thereafter. Japanese Patent Application Laid-Open No. 60-231478 discloses 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 then applying an aqueous solution of a water-soluble silicate. , A method of overcoating a cementitious composition, and the like. Japanese Unexamined Patent Publication 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 a rust preventive 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 and a rust preventive paint mixed with lithium silicate. 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 applying 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 and 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 steel 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]

The present invention has been proposed in view of the above, and is a porous material having a particle size of 5 to 0.06 mm, an air-dry bulk specific gravity of 1.5 to 0.1, and a water absorption rate of 500 to 15 wt%. The present invention relates to a mortar composition for repair and repair, which is an aggregate containing an anticorrosive or an alkali metal salt incorporated therein. The surface of the porous aggregate may be coated with cement.

The above-mentioned porous aggregate used in the present invention is
It has fine pores, has water absorption performance, and can improve the ironing workability of the mortar composition containing this, and can reduce the water permeability of the obtained mortar and improve the moisture permeability. Is.

The particle size of such 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 work.

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 is lowered, and the moisture permeability of the obtained mortar is lowered.

[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 · ySiO 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 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 repair / repair mortar composition. The repair / repair mortar composition of the present invention is a mixture of the above-mentioned porous aggregates, has good ironing workability, low water permeability and low water absorption, and intrusion of water from the outside, for example rainwater. Since it suppresses the intrusion of the like, it is possible to prevent corrosion of corrosive metal materials such as steel of reinforcing bars and lath mortar. In addition, repair of the present invention
The rehabilitation mortar composition can be blended as various inorganic hardened materials depending on the application, and for example, it can be appropriately blended and used as concrete, lightweight concrete, precast concrete member, ALC panel, cement mortar, etc. it can. Furthermore, the repair of the present invention
The repairing mortar composition has high moisture permeability and does not allow water to stay inside the inorganic hardened product obtained by curing the mortar composition, so that the formation of mold and rust can be prevented.

An inorganic hardened (molded) product obtained by curing the repair / repair mortar composition has a rust preventive agent uniformly dispersed and mixed therein, and the rust preventive agent is gradually dissolved in a trace amount, and the rust preventive agent is gradually dissolved for a long period of time. Exhibits rust prevention effect. In addition, the repair of the present invention
By applying the rehabilitation mortar composition to the surface of the existing inorganic cured (molded) or the refurbished part, the rust preventive can penetrate into the existing inorganic cured (molded) product and prevent rust. it can. Therefore, by using the repair / repair mortar composition of the present invention as an inorganic hardened (molded) product or on the surface of an existing inorganic hardened (molded) or a repaired part, a long-term Therefore, the rust preventive agent in the aggregate can prevent the corrosive metal material from rusting and prevent the deterioration of the inorganic cured material.

The surface of the above-mentioned aggregate may be coated with cement, and the aggregate may be mixed and hardened and granulated. As the above-mentioned cement, for example, Portland cement, Portland mixed cement, white cement, jet cement and 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, in the present invention, instead of the above-mentioned rust preventive, an aggregate containing an alkali metal salt such as lithium silicate or lithium nitrite may be blended. 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. Further, when the mortar composition containing the aggregate containing the alkali metal salt is applied to the surface or the repaired portion of the existing inorganic cured (molded), the inside of the existing inorganic cured (molded) is Since the alkali metal salt diffuses and permeates up to 1, the neutralization rate can be delayed.
Therefore, by using the mortar composition of the present invention as an inorganic hardened (molded) product or on the surface or a refurbished portion of an existing inorganic hardened (molded) product, the aggregate can be used for a long period of time. The alkali metal salt therein prevents the corrosive metal material from rusting and can prevent the deterioration of the inorganic cured product.

Further, by using together the aggregate containing the rust preventive of the present invention and the aggregate containing an alkali metal salt, it is possible to prevent the deterioration of the inorganic cured product for a longer period of time. You can

The mortar composition of the present invention contains a porous aggregate having a limited particle size, air-dry bulk specific gravity, and water absorption as described above, thereby suppressing the intrusion of water from the outside and the internal moisture content. Since it does not stay, it is possible to prevent the development of mold and rust, but by adding a porous aggregate containing a rust preventive agent or alkali metal salt as described above, the rust preventive effect can be further improved. And the deterioration of concrete can be prevented over a long period of time.

[0020]

EXAMPLES Examples of the present invention will be shown below. Examples 1 to 4 Porous aggregates shown in Table 1 were used, and repairing / repairing mortar compositions having the composition shown in Table 2 were designated as Examples 1 to 4, respectively. In addition, Examples 1 to 4 are reference examples.

Comparative Examples 1 and 2 The repairing / repairing mortar compositions having the compounding compositions shown in Table 2 were designated as Comparative Examples 1 and 2, respectively.

[0022]

[Table 1]

[0023]

[Table 2]

Test 1; Measurement of Flexural Strength Using the formulations of Examples 1 to 4 and Comparative Example 1 described above, test samples were prepared in accordance with the quality standards of JASS 15M-102 pre-mixed cement mortar prepared by Japan Architectural Institute of Japan. (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 The test samples were prepared according to the quality standards of JASS 15M-102 pre-mixed cement mortar of the Japanese Architectural Institute standard with the composition of Examples 1 to 4 and Comparative Example 1 described above. (G) was measured (n = 3), and the results are shown in Table 3.

Test 3; Measurement of Water Permeation Amount of the mixture of Examples 2 and 4 and Comparative Example 1 described above, a test of 75 mm in diameter and 20 mm in thickness according to the quality standard of JASS 15M-102 pre-mixed cement mortar of the Japanese Society of Building Engineers. Each sample was prepared, and the water permeation amount (ml) was measured (n = 3), and the results are shown in Table 3. In addition, 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, Each of Examples 2-A and 4-A was evaluated (n = 3), and the results are shown in Table 3.

[0027]

[Table 3]

Test 4; Moisture Permeability Test The composition of Examples 1 to 4 and Comparative Example 2 described above gives a diameter of 108 m.
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 mortars of Examples 1, 2 and 4 was top-coated with the above-mentioned cementitious composition A,
Evaluation as Example 1-A, 2-A, 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 mixed with the powder of the mortar composition in Example 2 to prepare a test sample. 2-B, the surface of the mortar of Example 2 was blended with 25% of the acrylic cement admixture polymer dispersion (solid content 60%) with respect to the mortar composition powder of the cement composition A described above. Example 2-C is one in which the cement-based composition C is overcoated, and one in which the cement-based composition C is overcoated on the surface of the mortar of the above-described Example 2-B is Example 2-D.
Was evaluated (n = 3), and the results are shown in FIG.

Further, 6.6% of the polymer dispersion for admixing acrylic cement (solid content 60%) was mixed with the powder of the mortar composition in Example 4 to give a test sample. 4-B, a cement system in which 25% of an acrylic cement admixture polymer dispersion (solid content: 60%) is added to the surface of the mortar of Example 4 with respect to the ordinary Portland cement of the cement composition A described above. Example 4 was overcoated with Composition C.
-C, on the surface of the mortar of Example 4-B described above,
The above-mentioned cement-based composition C was overcoated and evaluated as Example 4-D (n = 3), and the results are shown in FIG.

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

[Equation 1]

[0033]

[Table 4]

Aggregate A: Sabinone P in 120 cc of tap water
(Rust preventive, manufactured by Kirest Chemical Co., Ltd.)
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 placed in a dryer at 50 ° C. and dried.

Aggregate C: 120 cc of tap water and Sabinone P
(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 placed 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 placed in a dryer at 50 ° C. to be dried.

Aggregate K; ZOL-51 in 100 cc of tap water
0 g (lithium silicate aqueous solution) of 110 g 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.

Examples 5 to 16 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 to give Examples 5 to 16, respectively.

Comparative Examples 3 to 7 Comparative repairing and repairing mortar compositions 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.

[0047]

[Table 5]

[0048]

[Table 6]

Specimen 1; The mortar compositions of Examples 5 to 16 and Comparative Examples 3 to 7 described above were prepared according to the Japanese Society of Architectural Standards JASS.
The mixture is kneaded with 15M-102 in the amount of water shown in Tables 5 and 6, put in a 4 × 4 × 16 cm mold, and molded. After subjecting this to moisture-air curing at a temperature of 20 ° C. and a humidity of 80% or more for 48 hours, it was demolded 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 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 room 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 (manufactured by Fujikawa Kenzai Kogyo Co., Ltd.) 2
5 kg, 2.5 kg of a polymer dispersion for mixing acrylic cement (solid content 60%), and water were kneaded into a paste to be 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 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 sample 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 Neutralization Part After completion of each of the tests 5, 6 and 7 mentioned above, a 1% solution of phenolphthalein was sprayed on the fractured cross section to measure the area ratio of the neutralization part. (%) Was measured (n = 3), and the results are shown in Table 7-
8 shows.

[0057]

[Table 7]

[0058]

[Table 8]

[0059]

[Table 9]

[0060]

As described above, the repair / repair mortar composition of the present invention contains the porous aggregate having a limited particle size, air-dry bulk specific gravity, and water absorption rate to obtain a water permeability and a water absorption amount. Since it has less moisture, has high moisture permeability, and 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. That is, the repair / repair mortar composition of the present invention can prevent deterioration of an inorganic cured product by incorporating a porous aggregate having a limited particle size, air-dry bulk specific gravity and water absorption. . In addition, since the aggregate containing the rust preventive and the alkali metal salt incorporated in the above porous aggregate, the rust preventive and the alkali metal salt are contained in the inorganic cured (molded) product obtained by curing this. It dissolves in extremely small amounts and exhibits a rust preventive effect over a long period of time. Furthermore, when the above-mentioned repair / repair mortar composition is applied to the surface or the repaired portion of an existing inorganic cured (molded) product, the rust preventive agent and the alkali metal salt diffuse / penetrate into the interior,
It is possible to prevent the deterioration of this existing inorganic cured (molded) product for a long period of time, that is, the above-mentioned repair / repair mortar composition is simply a mixture of a rust preventive agent and an alkali metal salt in the mortar composition. It is possible to prevent the deterioration of the inorganic cured product over an extremely long period of time as compared with the above. Also,
In the above-mentioned repair / repair mortar composition, the one in which the aggregate coated with cement on the surface of the porous aggregate is mixed,
It is possible to further extend the rust preventive effect.

[Brief description of drawings]

FIG. 1 is a graph showing the results of a moisture permeability test of Examples of the present invention.

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

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

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

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location C04B 111: 26

Claims (2)

[Claims] 1. An air-dry bulk specific gravity of 1.
A repair / repair mortar composition comprising a porous aggregate having a water absorption rate of 5 to 0.1 and a water absorption rate of 500 to 15 wt% and containing an anticorrosive agent or an alkali metal salt. 2. A particle size of 5 to 0.06 mm and an air-dry bulk specific gravity of 1.
A porous aggregate having a water absorption rate of 5 to 0.1 and a water absorption rate of 500 to 15 wt% and containing a rust preventive agent or an alkali metal salt and having a surface coated with cement. Mortar composition for repair and repair.