JP3394966B2 - Polymer cement composition for concrete structure 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 polymer cement composition suitable for repairing a concrete structure when repairing a deteriorated part of an existing concrete structure or a structure using cement mortar.

[0002]

2. Description of the Related Art Concrete structures are 5-1 after construction.
After 0 years, the alkalinity in the concrete is removed by the reaction with carbon dioxide in the air, and the concrete is neutralized. With respect to the reinforcing bars in the concrete structure, rainwater enters from the surface of the concrete that has deteriorated due to the above-mentioned neutralization, which causes the reinforcing bars to be oxidized and expand. Finally, since the surface layer of the concrete structure cannot separate from the expansion of the reinforcing bars and peels off and falls, it is necessary to repair the concrete structure.

As a repairing material and a repairing method for such a concrete structure, for example, JP-A-4-149052 is known.
Japanese Patent Laid-Open Publication No. 2004-242242, a composition containing cement, silica fume, emulsion powder, alkali aluminate and / or calcium fluoroaluminate is premixed with water, or sprayed by mixing with water at the tip of a spray nozzle. The concrete repair construction method to perform is described. In addition, Japanese public Sho6
No. 2-15502 discloses a cement structure comprising a mixture of a liquid polymer cement composition containing water and an amorphous aluminum silicate having a molar ratio of aluminum oxide to silicon dioxide of 1: 1 to 1:10. There is described a repairing method in which the boundary portion between the cement structure and the repair material is made water-impermeable by applying and repairing.

[0004]

However, since the technique disclosed in the above-mentioned Japanese Patent Laid-Open No. 4-149052 is repair by spraying, the repair is performed by laminating repair materials having different functions as described later. It is impossible to adjust the thickness. In addition, since the boundary of each repair material cannot be clearly identified, it is not easy to carry out a proper amount of proper repair, and there are construction problems such as it is easy to mistake each repair material. At that time, there was a problem that repair costs were particularly high. And Japanese Examined Japanese Patent Sho 62-1550
In the technique disclosed in Japanese Patent Laid-Open No. 2, it is difficult to maintain the water content at a constant value because the liquid polymer cement composition is mixed with other powder components and water, and the quality such as strength varies widely, and There is a problem that uniform mixing is difficult because the viscosity of the liquid polymer cement composition is high.

The present invention has been made in view of the above circumstances, and provides a repair material which is difficult to be neutralized, and when repairing a plurality of repair materials having different functions in combination, the construction thickness can be easily identified. It is an object of the present invention to provide a polymer cement composition for repairing a concrete structure, which is capable of improving the quality, does not mix up the repair materials, and causes less variation in quality.

[0006]

A method according to the above-mentioned object.
The concrete structure repairing polymer cement composition described is a concrete structure repairing polymer cement composition used to repair a deteriorated part such as a structure using an existing concrete structure or cement mortar, Cement, dried aggregate, powdered water-soluble resin,
Water is mixed with an anhydrous mixed powder containing a water reducing agent powder and a defoaming agent powder , and the aggregate is blast furnace granulated powder.
It is composed of a mixture of rug and silica sand. Claim 2
Polymer cement composition for repairing concrete structures in Japan
Uses existing concrete structures or cement mortar.
Used to repair deteriorated parts such as used structures
A polymer cement composition for repairing concrete structures.
, Cement, dried aggregate, powdered water-soluble resin, reduced
Anhydrous mixed powder containing liquid powder and defoaming powder
Is mixed with water, and the aggregate is made of converter slag.
It is configured. The polymer cement composition for concrete structure repair according to claim 3 is the composition according to claim 1 or 2 , wherein the cement, aggregate, powdery water-soluble resin, water reducing agent powder, and defoaming agent powder are: When the cement is 1, the weight ratio of each is 1.0 to 2.5, 0.0
3-0.2, 0.005-0.05, 0.0005
It is 0.003. The polymer cement composition for repairing a concrete structure according to claim 4 is any one of claims 1 to 3.
The composition according to any one of the items 1 to 3 further contains a fiber component having a length of 3 mm to 30 mm in a weight ratio of 0.002 to 0.06 with respect to 1 of the cement. And the contract
The polymer cement composition for repairing a concrete structure according to claim 5 is the composition according to any one of claims 1 to 4 , further comprising a colorant.

[0007]

[Function] A skeleton repair material composed of the polymer cement composition for repairing a concrete structure of the present invention is filled and laminated in a recess such as a cracked portion to recover and maintain the mechanical strength of a damaged concrete structure. A strength imparting material used, such as cement, aggregate, powdery water-soluble resin,
Water is mixed with an anhydrous mixed powder containing the water reducing agent powder and the defoaming agent powder. As the aggregate, various materials such as silica sand, granulated blast furnace slag, and aluminosilicate hollow particles can be used.

In particular, granulated blast furnace slag has a particle size of 0.075 obtained by water cooling and crushing high temperature slag generated in the iron making process.
It is a dry aggregate of ˜2 mm, is inexpensive, and has a high alkalinity of the material itself, so that it has an action of preventing neutralization of the concrete structure. As the cement used in the present invention, in addition to ordinary Portland cement, hydraulic cement such as blast furnace cement containing a large amount of alkaline components produced from slag generated in the iron refining process as a raw material can be used.
When blast furnace cement is used, it is preferable to add fine powder of granulated blast furnace slag in a range of up to 30% by weight with respect to blast furnace cement because the hardening rate in winter is slow.
This improves the curing rate of the polymer cement composition for concrete structure repair.

The powdery water-soluble resin used in the present invention is a synthetic resin having a granular and water-soluble property, which improves the strength of the polymer cement composition for repairing concrete structures, and is, for example, water. There are dispersed acrylic resin powders. The water-dispersible acrylic resin powder is a powder obtained by drying and solidifying an emulsion of a water-soluble acrylic resin, and polyacrylate is generally used as the water-soluble acrylic resin. At this time, a substance containing calcium carbonate, silicic acid, or the like as the anticoagulant may be used. Further, in order to improve the adhesive force, it may be used by mixing with other powdery water-soluble resin. As the water reducing agent powder used in the present invention, a powder such as a melamine sulfonic acid type condensate can be used, and the amount of water added can be reduced to enhance the quality characteristics such as compressive strength and adhesive strength and workability. . The polymer cement composition for repairing a concrete structure of the present invention does not necessarily require addition of a thickener powder, and when the polymer cement composition is mixed with water to form a mortar, the viscosity is further increased. If it is desired to improve the workability of construction, a water-soluble thickener powder made of starch, methyl cellulose, hydroethyl cellulose, PVA or the like may be added to the polymer cement composition. As this thickener powder, trade name "Melose 90SH" manufactured by Shin-Etsu Chemical Co., Ltd. can be used.

The defoamer powder used in the present invention suppresses the generation of bubbles when the powder composition is mixed with water, is effective in densifying the construction body during construction, and is expected to improve strength. It is a powder. In the present invention, the silica sand mixed with the size of the granulated blast furnace slag used for the aggregate is JIS 6
No. to JIS No. 7 standard are used. The crushed particles of blast furnace slag are used as aggregate when blast furnace cement is used, and the size of the aggregate is usually 5 mm under. However, in the polymer cement composition of the present invention, the one using the granulated blast furnace slag with a particle diameter of 0.075 to 2 mm is more excellent in peeling resistance than the one using 5 mm under.

The slag used as the aggregate may be either blast furnace slag or converter slag. However, when the converter slag is used as the aggregate, the content of free CaO, free MgO and free FeO should be small. To use. Since normal converter slag contains a large amount of free CaO, free MgO, and free FeO, free CaO, free MgO, and free FeO in the normal converter slag can cause damage to concrete from the normal converter slag. When it is filled and repaired with a concrete repair material using the aggregate, the repair material expands by reacting with water, steam, and carbon dioxide existing in nature. Therefore, there is a problem that the filling / repairing part peels off and falls off.

Under the above circumstances, the converter slag is exposed to water vapor before being used as an aggregate, and 3CaO.
By causing a phase change of SiO ₂ and stabilizing free CaO (hereinafter referred to as “modification”),
Use after volume expansion in advance. However, free Ca
Converter slag containing a large amount of O, free MgO, and free FeO,
By making the refining time longer than usual, the content can be easily reduced. Extending the refining time above normal may seem difficult due to the profitability of the steel mill, but it is possible. In some cases, the converter slag may be transferred to a ladle, and then a suitable modifier (for example, a silicate mineral) may be added to modify and then crushed for use. In addition, the aggregate is easy to obtain a uniform water kneaded product,
The one treated to have a water content of less than 1% is used.

In the polymer cement composition for repairing a concrete structure of the present invention, cement, dried aggregate, powdered water-soluble resin, water-reducing agent powder, thickener powder used as necessary, and defoaming agent Water is used by mixing anhydrous mixed powder containing powder. Since the mixed powder is anhydrous (water content is less than 1%), there is little change with time of the material, and it is easy to uniformly mix the respective components in a dry state. And more specifically, the anhydrous mixed powder is each of the components such as the cement, aggregate, powdery water-soluble resin (for example, water-dispersible acrylic resin powder), water reducing agent powder, and defoaming agent powder. When the amount of the components is 1, the weight ratio is 1.0 to 2.5, and 0.03 to
0.2, 0.005-0.05, 0.0005-0.0
Since it is 03, workability and durability of the structure repair material obtained by adding and mixing water can be further enhanced. Here, the range of the amount of each component in the polymer cement composition for concrete structure repair is specified for the following reason.

That is, if the weight ratio of the aggregate is less than 1.0, the amount of added water for adding workability increases and the strength cannot be secured, and if the weight ratio exceeds 2.5, the amount of cement decreases. Therefore, the strength is reduced. A water-dispersible acrylic resin powder, which is an example of a powdery water-soluble resin, is a powder obtained by drying and solidifying an emulsion of a water-soluble acrylic resin. ) Brand name “Movinyl Powder”, R & H brand name “Primal (DP-2903)”, Badish brand name “Acronal (DS-6029), A-
1000 "etc. At this time, a substance containing calcium carbonate, silicic acid, or the like as the anticoagulant may be used.
If the weight ratio of the water-dispersed acrylic resin powder is less than 0.03, there is a problem that the strength and surface properties are deteriorated. Even if the weight ratio exceeds 0.2, the surface properties and strength are improved. Ineffective and useless. As the water reducing agent powder, a powder such as a melamine sulfonic acid condensate can be used, and the amount of added water can be reduced to improve the quality characteristics such as compressive strength and adhesive strength and workability. For example, Nissan Chemical Co., Ltd. Product name "SMF" of Showa Denko KK, product name "Molemaster" of Showa Denko KK
Etc. can be used. If the weight ratio of the water-reducing agent powder is less than 0.005, the density and strength are lowered, and even if the water-reducing agent powder is added in an amount exceeding 0.05, the water-reducing effect does not change much. When the thickener powder was added, the weight ratio of the thickener powder was 0.
If it exceeds 01, the viscosity becomes too high, which hinders the mortar construction work. The defoaming agent powder suppresses the generation of bubbles when the powder composition is mixed with water, and is effective in densifying the construction body at the time of construction.
N-deformer (14 HP) ", Asahi Denka Co., Ltd. trade name" Adecanol ", and the like. If the weight ratio of the defoaming agent powder is less than 0.0005, the defoaming effect cannot be exhibited, and the density and surface properties are deteriorated. Even if the weight ratio exceeds 0.003, the effect does not change and it is useless. is there.

In the polymer cement composition for concrete structure repair of the present invention, a fiber component having a length of 3 mm to 30 mm (more preferably about 10 to 18 mm) is added to cement 1 in a weight ratio of 0.002 to 0. When added in the range of 0.06, when the concrete structure is repaired, it becomes more difficult to peel off as compared with the one not added. As the fiber component, various inorganic fibers such as carbon fiber, alkali resistant glass fiber, alumina fiber and alumina silica fiber, and organic fiber such as vinylon can be used. It is believed that this is because the fibers prevent the generation of hair cracks and the growth of the hair cracks that have occurred. In addition, if the fiber content is less than 0.002, strength cannot be expected to be enhanced and peeling prevention effect cannot be expected, and if it exceeds 0.06, uniform dispersion of the fibers becomes difficult, and conversely the strength decreases, which is preferable. Absent. Here, if the length of the fiber component is less than 3 mm, the fiber component becomes the same as the particles and the force for connecting the composition does not work, resulting in insufficient strength. If the length of the fiber component exceeds 30 mm, the fibers are easily entangled and do not elongate at the time of finishing, so that the strength decreases and the effect of preventing cracking decreases, and when kneading, the fiber easily breaks, resulting in a decrease in strength. Not preferable. In addition, the length of the fiber portion is practically 10 to 18 m.
By setting m, a polymer cement composition for repairing a concrete structure having higher strength can be obtained. From the above-mentioned polymer cement composition for concrete structure repair and the one to which the fiber content has been added, by adding a small amount of a coloring agent, the color difference from the repair material to be applied or sprayed on it Therefore, it is possible to prevent mistakes in taking the material and omission of construction of the repair material.

Here, the colorant is added in such an amount that a difference in color tone is generated between the repairing materials so that the operator can distinguish them. Depending on the colorant, the colorant may react with the polymer cement composition to reduce the strength. Therefore, the colorant is adjusted to a color difference. In the polymer cement composition for concrete structure repair, the aggregate is a blast furnace granulated slag or converter slag generated in the iron making process, which is modified as necessary, and is a slag adjusted to a predetermined particle size. In the case of furnace slag, there is no problem if it is modified as described above, but the disadvantage is that the specific gravity is slightly increased.

[0017]

Embodiments of the present invention will now be described with reference to the accompanying drawings to provide an understanding of the present invention. FIG. 1 is a cross-sectional view showing a usage pattern of a polymer cement composition for concrete structure repair according to an embodiment of the present invention, in which (A) is generated by removing a deteriorated damaged portion of the concrete structure. The cross section of the concave portion is shown, and (B) shows the state after the concrete structure is repaired by the repair material.

First, the surface to be repaired of the concrete structure 16 deteriorated due to neutralization, cracking, peeling, etc. is suspended by a hammer, a cutter, a wire brush or the like to form a recess, and the reinforcing bar 11 etc. are shown in FIG. 1 (A). To expose. Further, the hanging portion 10 is washed with high-pressure water or the like, and when the pH of the concrete surface after the peeling is 10 or less, an alkali-imparting agent consisting of an aqueous solution of lithium nitrite or the like is used by a means such as a brush or a spray. Apply it to the concrete surface with a thickness of about 1 mm.

The rust preventive agent 12 is a water-dispersible acrylic resin powder 70 which is an example of a powdery water-soluble resin shown in Table 1 (A).
In a dry state, a powder composition comprising 1 part by weight, 1000 parts by weight of blast furnace cement, 1000 parts by weight of aggregate made of silica sand, 10 parts by weight of water reducing agent powder, 1 part by weight of defoaming agent powder, and 4 parts by weight of thickener powder is mixed. 10 parts by weight of red iron oxide, which is an example of a colorant, is added to the prepared mixture to form a uniform mixture, and 500 parts by weight of water is further added to the uniform mixture, which is uniformly kneaded with a mortar mixer. 2m
It is coated with a thickness of about m. In addition, Table 1 shows the relationship between the component composition and the construction result when the deteriorated and damaged part of the concrete structure is repaired using the polymer cement composition of the present invention.

[0020]

[Table 1]

Since the rust preventive material 12 is alkaline, the rust preventive effect is maintained for a long time. Further, at this time, since the rust preventive agent 12 is colored in red by the red iron oxide added, it is possible to easily identify the defective portion of application and improve the working efficiency. In addition, in Table 1, under the same conditions of construction, a test piece for quality measurement was separately prepared, and the specific gravity, bending strength and compression strength of the test piece were measured, and the workability evaluation result was used as the construction result. Are also listed as. Then, as shown in Table 1 (B), a skeleton repair material 17 using the polymer cement composition for concrete structure repair according to one embodiment of the present invention is filled in the recess. The skeleton repair material 17 is a repair material that requires a compressive strength of at least 200 kgf / cm ² or more in order to maintain the strength of the concrete structure 16 soundly.

Then, using a trowel or the like, the body repair material 17 composed of the polymer cement composition colored in red is
The deteriorated part of the concrete structure 16 was filled in the recessed part and the construction surface was leveled to finish the repair surface 10a into a substantially flat surface. The mortar defect repair material 14 shown in FIG. 1 (B) has 622 parts by weight of water added to the composition of the polymer cement of the present invention containing carbon fibers which is an example of the fiber content as shown in Table 1 (C). After that, the mixture is mixed by a mortar mixer in the same manner as described above, and is applied to the surface of the body repair material 17. The mortar defect repair material 14 of the present invention does not run down when applied to a vertical wall surface, has an appropriate viscosity, and can keep the repaired surface 10b that has been applied smooth. At this time, when the mortar defect repair material 14 requires particularly light weight and good workability, the amount of hollow particles (artificial lightweight aggregate) in the aggregate is increased to reduce the amount of silica sand. Table 3 (E) powder and grain composition 3
A mixture of 282 parts by weight and 706 parts by weight of water may be used.

Here, the hollow particles are aggregates made of aluminosilicate or shirasu balloon, and are raw materials which can reduce the weight of the construction body and adjust workability. In this case, that is, in Table 1 (E), compared to (A) to (D) in Table 1, the workability such as adhesion to the hanging portion 10 and the repair surface 10a and sagging prevention is further improved (⊚). be able to.
Then, the mortar defect repair material 14 is laminated with a thickness of about 30 mm by means such as trowel coating or spraying. The finish repair material 15 shown in FIG. 1 (B) emphasizes aesthetics,
In addition, since it is necessary to make it impermeable, a length of 10
a mortar defect repairing material containing carbon fiber of 18 mm to 18 mm and using only silica sand as an aggregate.
Is laminated on the surface of the repair surface 10b filled with 1 to 2 mm in thickness.

The finish repair material 15 of the present invention is shown in Table 1 (D).
In the polymer cement composition of the present invention shown in (1), 500 parts by weight of water is added and mixed. Concrete structure 1
The concave portion formed by removing the deteriorated and damaged portion of No. 6 is repaired by the polymer cement composition of the present invention as described above, and the repair material is color-coded for the necessary repair material. Since there were no mistakes and the repair amount and repair location could be accurately judged, efficient repairs could be performed. Further, it is economical to set the amount of granulated blast furnace slag in the mixed powder used for the frame repair material 17 and the mortar defect repair material 14 to be 0.5 to 1.5 by weight ratio with respect to the cement amount 1 to be added. It is desirable from the viewpoint of imparting alkalinity to concrete structures.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and changes in conditions and the like without departing from the gist are all within the scope of the present invention. For example, in this embodiment, carbon fiber was used as the fiber component to be mixed in the mortar defect repair material and the finish repair material, but alkali resistant glass fiber, other inorganic or organic fiber, etc. can be applied, and as a colorant other than red iron oxide. Various kinds of pigments can be used. However, if carbon fiber is contained in the rust preventive material, rust is induced by contact with the reinforcing bar, which is not preferable. In addition, although the amount of water added during construction has been limited in the examples, it is of course possible to change it according to the application or the season. Furthermore, the repair material should be constructed by means such as spraying. Is also possible.

[0026]

EFFECTS OF THE INVENTION In the polymer cement composition for repairing a concrete structure according to claims 1 to 5 of the present invention, since dry aggregate is used, there is little change with time of the material during storage, and lumps are also generated. Since it does not exist, the kneaded product prepared by adding water on the spot easily becomes uniform. Also, since weighed items can be stored in the same package,
It was possible to obtain a uniform kneaded product, and the repaired part of the concrete structure using this was difficult to neutralize, and further, peeling was difficult. Further, when the fiber content is included, it is possible to achieve high strength by entanglement of the fibers dispersed in the mortar when water is added to form the mortar, and to prevent peeling of a deteriorated concrete structure. it can. Furthermore, when a small amount of a coloring agent for identifying the raw material and the mortar containing water added thereto is included,
As a result, the repaired part of the concrete structure will become colored, and it becomes easier to control the construction thickness of the repair material with different functions such as coating and spraying on the repaired part, improving the repair quality at the same time, There are no repair mistakes caused by mistaken repair materials.

[Brief description of drawings]

1A and 1B are cross-sectional explanatory views showing a usage pattern of a polymer cement composition for concrete structure repair according to an embodiment of the present invention.

[Explanation of symbols]

10: chipped portion, 10a: repair surface, 10b: repair surface, 1
1: Reinforcing bar, 12: Rust preventive material, 14: Mortar defect repair material,
15: Finishing repair material, 16: Concrete structure, 1
7: Body repair material

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI E04G 23/02 E04G 23/02 B // C04B 111: 72 C04B 111: 72 (73) Patent holder 592179849 Company 3-7-1, Kanda-Jinbocho, Chiyoda-ku, Tokyo New Kudan Building (73) Patent holder 000108904 Daiki Industry Co., Ltd. 5-6-64 Akasaka, Kokurakita-ku, Kitakyushu-shi, Fukuoka (73) Patent holder 595053559 Gokou Sangyo Co., Ltd. 4-1-2, Jono, Kokuraminami-ku, Kitakyushu City, Fukuoka Prefecture (72) Inventor Akihiro Kitamura 1-1, Toibata-cho, Tobata-ku, Kitakyushu-shi, Fukuoka Prefecture Inventor, Yawata Works (72), Nippon Steel Corporation Takao Yamamoto 27-27 Kawabuchi-cho, Yawatahigashi-ku, Kitakyushu, Fukuoka Prefecture Taihei Kogyo Co., Ltd., Yawata Branch (72) Inventor Kazuhiko Itonaga 10-31 Yoshino-cho, Kitakyushu, Kitakyushu-shi, Fukuoka Kitakyushu City Building and Equipment Conservation Public Corporation (72) Inventor Koji Hori 10-31 Yoshino-cho, Kokurakita-ku, Kitakyushu City, Fukuoka Prefecture Kitakyushu City Construction and Equipment Conservation Public Corporation (72) Inventor Kenji Yuasa Fukuoka Prefecture 10-31 Yoshino-cho, Kokurakita-ku, Kitakyushu City Kitakyushu City Building and Equipment Conservation Public Corporation (72) Inventor Yoshio Fujimura 5-6-20 Nakasu, Hakata-ku, Fukuoka City, Fukuoka Sanryo Chemical Co., Ltd.Kyushu Branch (72 ) Inventor Iwao Otaki 4-1-1, Fushimi-cho, Chuo-ku, Osaka-shi, Osaka Prefecture, Osaka Sales Office, Dainippon Coloring Materials Co., Ltd. (72) Mikitomo Ikeda, 5-6, Akasaka, Kokurakita-ku, Kitakyushu, Fukuoka No. Daiki Industry Co., Ltd. (72) Inventor Yoichi Nakajima 4-1-2, Shirono, Kokuraminami-ku, Kitakyushu City, Fukuoka Prefecture (56) Within Goko Sangyo Co., Ltd. (56) Reference JP-A-713862 (JP, A) JP Japanese Patent Laid-Open No. 5-345652 (JP, A) Japanese Patent Laid-Open No. 4-219357 (JP, A) Japanese Patent Laid-Open No. 7-25652 (JP, A) Japanese Patent Laid-Open No. 58 199764 (JP, A) (58 ) investigated the field (Int.Cl. ^7, DB name) C04B 2/00 - 32/02 C04B 40/00 - 40/06

Claims (5)

(57) [Claims] 1. A polymer cement composition for repairing a concrete structure, which is used for repairing a deteriorated portion of an existing concrete structure or a structure using cement mortar, comprising cement, dried aggregate and powder. Jo-soluble resin, water reducing agent powder, and mixed powder of anhydrous containing the antifoam powder, made by mixing water, moreover, is high the aggregate
That it is composed of a mixture of granulated reactor slag and silica sand
A characteristic polymer cement composition for repairing a concrete structure. 2. An existing concrete structure or cement model.
Repairing deteriorated parts such as structures using rutar
Polymer cement for repairing concrete structures used for
Composition, cement, dried aggregate, powdered water-soluble
Water-soluble resin containing water-soluble resin, water reducing agent powder, and defoaming agent powder
Water is mixed with the powder mixture, and the aggregate is a converter.
A polymer cement composition for repairing a concrete structure, which is composed of slag . 3. The cement, the aggregate, the powdery water-soluble resin, the water reducing agent powder, and the defoaming agent powder have a weight ratio of 1.0 to 2.5, 0 when cement is 1. .0
3-0.2, 0.005-0.05, 0.0005
The polymer cement composition for repairing a concrete structure according to claim 1 or 2 , wherein the polymer cement composition is 0.003. 4. Further, the weight ratio of the fiber portion having a length of 3 mm to 30 mm to the cement 1 is 0.002 to 0.06.
The polymer cement composition for repairing a concrete structure according to any one of claims 1 to 3, which is included in the range of. 5. The polymer cement composition for repairing a concrete structure according to claim 1, wherein a colorant is added.