JP2012153577A - Self-recovery concrete admixture, method for manufacturing the same and self-recovery concrete material using the admixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crack self-recovery concrete admixture capable of self-recovering cracks generated on a concrete structure without requiring human repair or the like and capable of improving long-term durability of the concrete structure, and to provide a method for manufacturing the concrete admixture and a crack self-recovery concrete material using the concrete admixture.SOLUTION: The crack self-recovery concrete admixture includes: granules containing cement (A) and water less than theoretical water volume necessary for hydration with the cement (A) and having a mean particle diameter of 30 to 50 μm; urea; and fibers. The self-recovery concrete material is obtained by mixing the concrete admixture in a range of 10 to 70 pts.mass per 100 pts.mass of the cement.

Description

  The present invention relates to a self-repairing concrete admixture, a method for producing the same, and a self-repairing concrete material using the admixture, and particularly self-repairs cracks generated in concrete in order to ensure long-term durability of a mortar or a concrete structure. The present invention relates to a self-repairing concrete admixture, a method for producing the same, and a self-repairing concrete material using the admixture.

Hydrated cured products such as mortar and concrete have a high resistance to compression but a low resistance to tension. Therefore, cracking occurs when tensile stress acts on the hydrated cured product or when volume changes due to temperature change or drying. There is a drawback that it is easy.
If cracks occur in a reinforced concrete structure, not only will the appearance be impaired, but atmospheric carbon dioxide and rainwater will penetrate into the concrete from the cracked surface, corrode the embedded reinforcing steel, and cause structural defects. obtain. For this reason, repairs such as waterproofing and waterproofing have been carried out for excessive cracking.
However, such repair of cracks has a problem that it costs much higher than the unit cost of concrete and increases the maintenance cost of the reinforced concrete structure.

As means for solving such a problem, Japanese Patent Application Laid-Open No. 9-86983 (Patent Document 1) discloses a self-repairing hydrated cured product containing an unhydrated cement clinker as an aggregate.
Further, JP 2003-267765 A (Patent Document 2) discloses a concrete configured such that an unreacted portion of a powder containing cement remains at the time when it is hardened after being placed. As a practical means, increasing the amount of cement with respect to water is disclosed.

However, in the method of blending cement clinker with the above-mentioned hydrated cured product, the gypsum component is insufficient, and there is a risk of rapid or instantaneous setting, or the fluidity of the resulting hydrated cured product.
Furthermore, if the particle size of the cement clinker to be blended is too large, there is a possibility that locally generated cracks cannot be repaired.If the particle size is too small, the reactivity is too high. It is almost complete and the cement clinker may not be able to contribute to crack repair.
Moreover, in the method of increasing the amount of cement with respect to water, the self-healing ability of the obtained hydrated cured product was insufficient.

JP-A-9-86983 JP 2003-267765 A

  An object of the present invention is to solve the above-mentioned problems, and to self-repair cracks generated in a concrete structure without the need for human repair, etc., and to improve the long-term durability of the concrete structure. It is possible to provide a crack self-repairing concrete admixture, a method for producing the same, and a crack self-repairing concrete material using the concrete admixture.

In order to solve the above problems, the crack self-repairing concrete admixture of the present invention has an average particle size of 30 to 50 μm containing cement (A) and less than the theoretical amount of water necessary for hydration of the cement (A). A self-healing concrete admixture with cracks, characterized in that it contains a granulated product, urea and fibers.
Preferably, in the self-healing concrete material of the present invention, water less than the theoretical water amount necessary for hydration of the cement (A) is contained in an amount of 5 to 25 parts by mass with respect to 100 parts by mass of the cement (A). It is characterized by being.
More preferably, in the self-repairing concrete material of the present invention, urea is mixed at 5 to 15 parts by mass with respect to 100 parts by mass of the cement (A).
More preferably, in the self-repairing concrete material of the present invention, the fiber has a fiber length of 10 mm or less, and is mixed at 0.5 to 2 parts by volume with respect to 100 parts by volume of the cement (A). It is characterized by.

  The method for producing a crack self-repairing concrete admixture according to the present invention comprises kneading cement (A) with less than the theoretical amount of water necessary for hydration of the cement (A), and then curing in air for 3 days or more. A granulated product having an average particle size of 30 to 50 μm is produced by advancing the hydration reaction of the cement (A), and the granulated product is produced by mixing urea and fibers. This is a method for producing a self-repairing concrete admixture with cracks.

The crack self-repairing concrete material of the present invention contains cement (B), the self-repairing concrete admixture according to any one of claims 1 to 4, fine aggregate and water, and 100 parts by mass of the cement (B). The self-repairing concrete material is characterized by containing 10 to 70 parts by mass of the self-repairing concrete admixture.
Preferably, in the cracked self-repairing concrete material of the present invention, the mixture of the fine aggregate and the self-repairing concrete admixture is 90:10 to 75:35 in mass ratio.

The crack self-repairing concrete admixture of the present invention and the concrete material containing the admixture can self-repair cracks generated without the need for human repair, etc., and enhance the long-term durability of the concrete structure. Can do.
Therefore, it is not necessary to periodically manage and repair deterioration such as cracks in the concrete structure, no special equipment or repair period is required, and the management of the concrete structure is simplified and long-term. Usability can be improved.
Moreover, the manufacturing method of the crack self-repairing concrete admixture of this invention can manufacture the said self-repairing concrete admixture of this invention efficiently.
Furthermore, the fluidity of fresh concrete is maintained by the effect of urea mixed with the cracked self-healing concrete admixture of the present invention.
Furthermore, the period from the occurrence of cracking to self-repair is shortened by the effect of the fibers mixed in the crack self-repairing concrete admixture of the present invention.

The crack self-repairing concrete admixture of the present invention and the concrete material using the admixture will be described below.
The self-repairing concrete admixture of the present invention comprises a granulated product having an average particle size of 30 to 50 μm, urea and fibers containing cement (A) and water less than the theoretical water amount necessary for hydration of the cement (A) Is included and mixed.
By using such a granulated product having a hydration reaction unreacted part in a concrete admixture, the hydration reaction unreacted part in the granulated product is present in the presence of water. The hydrate produced by the hydration reaction is filled in the crack portion generated in the concrete structure, so that the crack generated in the concrete structure can be self-repaired.

Examples of the cement (A) contained in the self-healing concrete admixture of the present invention include various portland cements such as normal, moderately hot, low heat, early strength, ultra-early strength, sulfate resistance, blast furnace cement, fly ash cement and silica. Examples thereof include at least one of mixed cements such as cement, and specifically, Portland cement, blast furnace cement, silica cement, fly specified by JIS R 5210, JIS R 5211, JIS R 5212, JIS R 5213, and the like. Examples include ash cement.
Moreover, the low heat Portland cement prescribed | regulated to JISR5210 is preferable suitably.

Furthermore, water is mix | blended with the said admixture of this invention, and this water is contained in the quantity less than the theoretical water quantity required for the hydration of the said cement (A). Therefore, the obtained admixture contains the unhydrated reaction part.
Here, the theoretical water amount necessary for hydration of the cement (A) constituting the admixture is the amount of chemically bound water when all of the cement (A) is hydrated, and the cement particles (A). The total amount of water that is contained in a hydrate and physically immobilized when water reacts.
Preferably, the amount of water is preferably obtained by containing 5 to 25 parts by mass of water with respect to 100 parts by mass of the cement (A) constituting the admixture, and further 5 to 10 parts by mass of water. What is obtained by making it contain is more preferable, and what is obtained by containing 5-7 mass parts of water is further more preferable. When the amount of water contained in the cement (A) is 5 parts by mass or more, the hydration reaction activity of the cement (A) is sufficiently reduced, and when it is 25 parts by mass or less, the resulting concrete admixture Since any unreacted portion remains, the effect of the present invention is remarkably exhibited in any case.

  The method for producing a granulated product contained in the admixture of the present invention comprises uniformly mixing the cement (A) and less than the theoretical amount of water necessary for hydration of the cement (A), and curing in the air. By doing so, it is manufactured by making a granular material having an average particle diameter of 30 to 50 μm.

Specifically, the cement (A) and the above amount of water are uniformly kneaded and then cured in the air for 3 days or more.
Here, the air curing is based on curing in air at 20 ° C. and humidity 60%. By carrying out such air curing, the hydration reaction of the cement (A) is advanced to obtain a granulated product having an average particle size of 30 to 50 μm.
The air curing is preferably obtained by proceeding with hydration for 3 days or more, preferably 7 to 28 days, and in particular, curing for 7 to 14 days to promote hydration of the cement (A). It is more preferable to apply what is obtained. If the hydration period after adding this amount of water to the cement (A) is 3 days or more, the reaction activity of the cement (A) is sufficiently reduced, so the effect of the present invention is more remarkable. Demonstrated.

By performing such air curing, the granulated product contained in the admixture of the present invention becomes secondary particles in which the contained cement particles are aggregated and bonded. Accordingly, the average particle size of the cement (A) contained is generally about 10 μm, whereas the average particle size of the granulated product contained in the admixture of the present invention is 30 to 50 μm.
In the present invention, the average particle diameter means the number average particle diameter of the particle size distribution measured by a laser diffraction / scattering method (microtrack method).

Next, the admixture of the present invention is obtained by uniformly mixing the granulated product obtained by the above method, urea, and fibers.
Urea can improve the decrease in fluidity of concrete due to the use of the granulated product. As a result, even when the use amount of the admixture of the present invention is large in the concrete material at the following blending ratio, the fluidity of the concrete can be maintained, and the increase in the use amount of the present invention results in the admixture of the present invention. The self-healing function of concrete materials using sapphire is enhanced. Urea that can be used is not particularly limited, and any reagent such as a reagent or industrial product can be applied.
Thus, by mix | blending urea, it becomes possible to make fluidity | liquidity into the range of fluidity | liquidity substantially equivalent to general concrete. Generally, the fluidity of concrete is measured according to the slump test method of JIS A1101 concrete or the slump flow test method of JIS A1150 concrete, and slump is 8 to 21 cm (tolerance ± 1.5-2. 5cm), for high-strength concrete, slump 10 to 18 cm (tolerance ± 2.5 cm) or slump flow 50 to 60 cm (tolerance ± 7.5 to 10 cm) are standard values. It becomes possible to do.
The blending amount is 5 to 15 parts by mass with respect to 100 parts by mass of the cement (A) to be blended to express the effect of the present invention more remarkably.
If the blending amount of urea is less than 5 parts by mass, the effect of improving fluidity by urea cannot be sufficiently exhibited, and if it exceeds 15 parts by mass, a significant delay in hydration is caused.

Furthermore, fibers are mixed in the admixture of the present invention. The fiber can further enhance the crack repair function of the admixture of the present invention. This is considered to be due to the effect that the fiber promotes the movement of elements accompanying the movement of water in the concrete and the function of the fiber as a precipitation site in the cracked portion. The fiber that can be used is not particularly limited as long as a material harmful to the human body such as asbestos is removed, and any material such as a polymer fiber, an inorganic fiber, and a metal fiber can be used. In addition, short fibers are suitable for the shape of the fibers, and short fibers having a fiber length of 10 mm or less and a fiber diameter of 0.5 mm or less are particularly preferable.
The blending amount is 0.5 to 2 parts by volume with respect to 100 parts by volume of the cement (A) to be blended, so that the effects of the present invention are more remarkably exhibited.
If the blending amount of the fiber is less than 0.5 part by volume, the distribution of the fiber in the concrete material will be reduced, so that a sufficient effect cannot be expressed. If the blending amount exceeds 2 parts by volume, the fluidity of the concrete may be reduced. This is not preferable because excessive entrainment air is mixed.

By using the cracked self-repairing concrete admixture of the present invention as a concrete raw material, the cracked self-repairing concrete material of the present invention can be obtained.
That is, the crack self-repairing concrete material of the present invention contains cement (B), the self-repairing concrete admixture of the present invention, fine aggregate and water, and the self-repairing with respect to 100 parts by mass of the cement (B). It is a crack self-repairing concrete material characterized by containing 10-70 mass parts of concrete admixtures.
The granulated material contained in the admixture exists as a granular material in the concrete material, and the granulated material has a portion where the hydration reaction has not been reacted. By using it as an admixture, the unreacted portion of the granulated product exhibits a hydration reaction in the presence of water and can self-repair cracks generated in the concrete structure.

As the cement (B) used in the cracked concrete repair concrete material of the present invention, the various cements (A) used in the admixture can be used.
In addition, the cement (B) contained in the concrete material may be the same or different from the cement (A) constituting the admixture contained in the concrete material. However, it is desirable to use the same cement, and the low heat Portland cement specified in JIS R 5210 is most preferable.

The concrete material of the present invention includes the admixture of the present invention.
The cement (B) contained in the concrete material and the granulated product contained in the admixture have different hydration reaction activities.
That is, when the cement (B) blended in the concrete material and the granulated material coexist, the hydration reaction activity with water reacts preferentially with the cement (B). By the reaction with (B), most of the water blended in preparing the concrete material is consumed. Therefore, water sufficient for the hydration reaction of the granulated material is deficient, and most of the granulated material remains in the concrete as unreacted nuclei.
The granulated material present in the concrete as unreacted nuclei, once cracked in the concrete, gradually starts to react with water supplied from the outside, and the hydrated unreacted portion of the granulated material remains. The hydrate deposited by the reaction between water and water fills the cracks, thereby realizing self-repair of the cracks. Further, as described above, the admixture contains fibers, and the self-repair function of concrete cracks by the admixture is enhanced.
Furthermore, since the admixture contains urea, it can have an appropriate fluidity.

The blending ratio of the admixture in the concrete material contains 10 to 70 parts by mass, preferably 40 to 60 parts by mass of the self-repairing concrete admixture with respect to 100 parts by mass of cement (B).
If the admixture is less than 10 parts by mass, the cracked portion will not be sufficiently filled and a sufficient self-repair function will not be exhibited. On the other hand, if it exceeds 70 parts by mass, the fluidity of the resulting cracked self-repairing concrete material will be greatly It is not preferable for practical use.
The admixture is preferably used by replacing a part or all of the fine aggregate blended in the crack self-healing concrete material such as mortar and concrete from the viewpoint of managing the strength of the mortar and concrete.

  The crack self-repairing concrete material of the present invention contains fine aggregate, and the ratio of the fine aggregate to the admixture is preferably 90:10 to 75:35 in mass ratio. When the blending ratio of the admixture of the present invention is smaller than the above range, the filling of the cracked portion is insufficient, and a sufficient self-repair function is not exhibited. Since the fluidity of the cracked self-repairing concrete material is greatly reduced, it is not preferable in practice.

In addition to the fine aggregate, coarse aggregate can be blended as necessary. As the fine aggregate, any fine aggregate used in concrete can be used, and as the coarse aggregate, any coarse aggregate used in concrete can be used.
Specifically, as the aggregate, either natural aggregate or artificial aggregate may be used, and as natural aggregate, river sand, mountain sand, sea sand, land sand, river gravel, mountain gravel, sea Examples include gravel and volcanic rubble, and artificial aggregates include crushed sand, crushed stone, blast furnace slag fine aggregate, blast furnace slag coarse aggregate, artificial lightweight fine aggregate, artificial lightweight coarse aggregate, copper slag fine aggregate And ferronickel fine aggregate, electric furnace oxidized slag fine aggregate, electric furnace slag coarse aggregate, molten slag fine aggregate, molten slag coarse aggregate, and the like. The fine aggregate preferably has a fine particle amount of 5% by mass or less, more preferably 3% by mass or less, determined by the method of JIS A 1103 “Aggregate Fine Particle Amount Test Method”.
It is desirable to select fine aggregates and coarse aggregates having quality that satisfies the required strength.

  Further, if necessary, the self-healing concrete material of the present invention can contain silica fume as long as the effects of the present invention are not impaired. Silica fume is a spherical ultrafine particle material with a particle size of about 0.1 to 0.3 μm mainly composed of amorphous silicon dioxide produced as a by-product during the production of metallic silicon and ferrosilicon. The hardened body is densified by the high pozzolanic activity and the microfiller effect, and the strength is enhanced.

  Furthermore, if desired, a water reducing agent can be contained in a range not impairing the effects of the present invention. Examples of the water reducing agent include a high performance water reducing agent and a high performance AE water reducing agent which is a polycarboxylate-based water reducing agent. The high-performance water reducing agent is mainly composed of either a polyalkylallyl sulfonate system or a melamine formalin resin sulfonate system.

  Examples of the polyalkylallylsulfonate-based high-performance water reducing agent include methyl naphthalene sulfonic acid formalin condensate, naphthalene sulfonic acid formalin condensate, and anthracene sulfonic acid formalin condensate. ) Product name "FT-500" and its series, product name "Mighty-100 (powder)" and "Mighty-150" and its series made by Kao Corporation, products made by Daiichi Kogyo Seiyaku Co., Ltd. The name “Cellflow 110P (powder)”, the product name “Pole Fine 510N” manufactured by Takemoto Yushi Co., Ltd., and the like can be given. Melamine formalin resin sulfonate-based high-performance water reducing agent includes Grace Chemicals' product name “FT-3S”, Showa Denko Co., Ltd. product name “Molmaster F-10 (powder)” and “Molmaster F”. -20 (powder) ".

The polycarboxylate-based high-performance AE water reducing agent includes a product name “Leo Build SP8” series manufactured by NM Co., Ltd., a product name “Floric SF500” series manufactured by Floric Co., Ltd., and Takemoto Yushi Co., Ltd. Product name “Chupor HP8,11” series, product name “Darlex Super 100, 200, 300, 1000” series manufactured by Grace Chemicals Co., Ltd., “Mighty 21WH, 3000S” manufactured by Kao Corporation, etc. Other commercial products are also used.
The usage-amount of a high performance water reducing agent or a high performance AE water reducing agent is about 1.0-3.0 mass parts normally with respect to 100 mass parts of said cements.

  In addition, the amount of water blended as the kneaded water in the self-healing concrete material of the present invention can be changed depending on the type and blending of the materials used, but is not uniquely determined. B) The ratio by mass ratio is preferably 15 to 50% from the viewpoint of preserving the hydration potential of the self-repairing concrete admixture, and more preferably 15 to 40%.

The concrete material is prepared by uniformly blending the raw materials including the cement (B), the admixture, the fine aggregate, and water. There is no limitation on the mixing conditions, the type of the mixer, etc., and the respective materials may be mixed and used at the time of construction, or some or all of them may be mixed in advance.
As the mixing device, any existing device can be used. For example, a known device such as a pan type forced mixer, a biaxial forced kneading mixer, an omni mixer, a Henschel mixer, a nighter mixer, a tilting mixer, or a continuous kneading mixer may be used. it can.

In addition, the method for self-repairing cracks in concrete is provided by supplying water to the cracked part of the concrete structure using the concrete material of the present invention, so that the cracked part is contained in the cracked self-repairing concrete admixture contained therein. Can be self-repairing.
Since the granulated material contained in the admixture is a granular material, the unhydrated portion of the cement (A) remaining inside gradually undergoes a hydration reaction with the supplied water, and the contained fibers Has the effect of promoting the movement of elements accompanying the movement of water in concrete and the function of the fibers as precipitation sites in the cracked part, so that the hydrate produced is self-filled in the cracked part generated in the concrete structure. By doing so, self-repair of cracks generated in the concrete structure can be realized.
In particular, if the crack width is 0.5 mm or less and the concrete structure is capable of continuously supplying water, the self-repair of cracks can be more effectively realized.

The invention is illustrated by the following examples, comparative examples and test examples.
(Raw materials used)
Cement N: Product name Normal Portland cement (manufactured by Sumitomo Osaka Cement Co., Ltd.)
Cement L: Product name Low heat Portland cement (manufactured by Sumitomo Osaka Cement Co., Ltd.)
Fine aggregate: Standard sand (JIS R 5201 Annex 3)
Urea: Industrial chemicals (Mitsui Chemicals)
Short fiber: Vinylon fiber for roof and wall materials and mortar Cut length 6mm
(Made by Unitika Ltd.)
Water: Tap water

(Examples 1-5, Comparative Examples 1-3)
(Preparation of crack self-repairing concrete admixture)
Using each of the above raw materials, cement and water were blended at the blending ratio shown in Table 1, and uniformly kneaded using a biaxial forced mixer, and then as a hydration reaction period, an air temperature of 20 ° C. and a humidity of 60% The granulated material shown in Table 1 was prepared by leaving still for 7 days. The average particle diameter of the granulated product is a value measured by the laser diffraction / scattering method (microtrack method) (MT3300EXII, Nikkiso Co., Ltd.) as described above.
Subsequently, each concrete admixture was prepared by mix | blending urea and a short fiber with the compounding ratio shown in Table 1 to each obtained granulated material, and mixing uniformly.

(Examples 6 to 17, Comparative Examples 4 to 10)
(Preparation of concrete materials)
After using the concrete admixtures shown in Table 1 above and mixing and stirring the admixtures, cement, and fine aggregates into the biaxial forced kneading mixer at the mixing ratio shown in Table 2, Water was added and kneaded uniformly to prepare each mortar.
In addition, in Table 2, the mortar flow value immediately after preparation of each mortar is shown collectively. The mortar flow value was measured in accordance with JIS R5201 “Cement physical test”, and measured with a zero-stroke flow without dropping motion after pulling up the flow cone (flowability test).

(Test example)
(Water permeability test)
The mortars obtained in Examples 6 to 12 and Comparative Examples 4 to 7 were placed, and water curing was carried out in water at 20 ° C. to prepare 100 × 100 × 120 mm thick cured specimens.
Seven days after the preparation of each cured specimen, a split tensile load was applied to each specimen, and a crack having a width of 0.1 to 0.2 mm × 100 mm × 100 mm was provided through the center of each specimen. Both sides of the crack were sealed so that water did not leak.

Water was injected into the cracked portion provided in each cured specimen, and the degree of repair by self-repairability of the crack was evaluated.
Specifically, cracks were respectively introduced after 7 days of age while curing each mortar specimen in water at 20 ° C.
Immediately after introducing the cracks into each mortar specimen, water is introduced into the cracks at the top of the cured specimen by a compressor at a water pressure of 0.01 MPa, and the lower surface facing the upper surface where the cracks are introduced into the specimen. From the above, the amount of water permeated per unit time (within 10 minutes after introducing water into the cracked portion) was measured, and the obtained water permeation amount was defined as the initial water permeation amount.

After each crack was introduced, each mortar specimen was cured in water at 20 ° C., and 1, 3, 7, and 28 days after the crack was introduced, each mortar specimen was removed from the water, and the crack was removed. Water was introduced into the part at a water pressure of 0.01 MPa, and the amount of water per unit time permeated from the lower surface facing the upper surface where cracks were introduced in the specimen (10 minutes after water was introduced into the cracked part) Within).
The ratio of the water permeability measured at each age with respect to the initial water permeability of each mortar specimen (represented by 0 day (immediately after) in Table 3) is defined as the water permeability ratio, and the results of the obtained water permeability ratios are shown in Table 3. Shown in

  As shown in Table 3, in the mortar using the crack self-repairing concrete admixture of the present invention, the water permeability ratio was remarkably reduced at the beginning of the test. That is, in the examples, it means that the cracks generated in the concrete etc. are closed and the water permeability is stopped, and the concrete material of the present invention is excellent in self-repairing property against the cracks generated in the concrete etc. It can be seen that

  The present invention can be applied to various concrete structures, and can be suitably applied to concrete structures not only in the construction field, but also in the civil engineering field, particularly concrete structures in which water can be continuously supplied. It becomes.

Claims (7)

  Cracks characterized by containing a granulated product having an average particle size of 30 to 50 μm, containing urea and fibers containing cement (A) and less than the theoretical amount of water necessary for hydration of the cement (A) Self-healing concrete admixture.   2. The self-repairing concrete material according to claim 1, wherein water less than a theoretical water amount necessary for hydration of the cement (A) is contained in an amount of 5 to 25 parts by mass with respect to 100 parts by mass of the cement (A). Cracking self-healing concrete admixture characterized by.   The self-repairing concrete material according to claim 1 or 2, wherein urea is mixed at 5 to 15 parts by mass with respect to 100 parts by mass of the cement (A).   The self-repairing concrete material according to any one of claims 1 to 3, wherein the fiber has a fiber length of 10 mm or less and is mixed at 0.5 to 2 parts by volume with respect to 100 parts by volume of the cement (A). A self-healing concrete admixture that is cracked.   By kneading the cement (A) with less than the theoretical amount of water necessary for hydration of the cement (A) and then curing in air for 3 days or more to advance the hydration reaction of the cement (A) A method for producing a cracked self-repairing concrete admixture, comprising producing a granulated product having an average particle size of 30 to 50 μm and mixing the granulated product, urea and fibers.   The cement (B), the self-repairing concrete admixture according to any one of claims 1 to 4, the fine aggregate and water, and the self-repairing concrete admixture with respect to 100 parts by mass of the cement (B). The crack self-repairing concrete material characterized by containing 10-70 mass parts.   The crack self-repairing concrete material according to claim 6, wherein the mixture of the fine aggregate and the self-repairing concrete admixture is 90:10 to 75:35 in mass ratio. material.