JPH08133798A - Colored concrete composition and its production - Google Patents

Abstract

PURPOSE: To produce a colored concrete composition which eliminates a problem such as color unevenness and exudation being a fault of a conventional method in which a raw concrete and a pigment are merely mixed, and further more is excellent in wear resistance, water resistance, watertightness and durability. CONSTITUTION: This colored concrete composition is obtained by mixing the raw concrete, the pigment and an aqueous dispersion composition, and an asphalt emulsion, a polymer emulsion, a waste plastic emulsion, etc., obtained by using partially saponified polyvinyl alcohol swollen previously with water are used as a preferable aqueous dispersion composition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a colored concrete composition and a method for producing the same, and more particularly, to a colored concrete composition and a method for producing the same, which provides colored concrete having excellent appearance, functionality and durability.

[0002]

2. Description of the Related Art Conventionally, a method of applying a color paint to the surface of concrete has been known as a construction method for color concrete. As color paint, epoxy resin,
Water-based or oil-based paints in which a filler such as ceramic powder or metal powder (iron, aluminum, etc.) is mixed with urethane resin, acrylic resin, vinyl chloride resin, etc. are used. However, when the coating film is worn out, the color is lost, and there is a drawback that the purpose is not achieved, especially in a place where many people and cars come and go, such as a dirt floor.

Also known is a method of coating the surface of concrete with color mortar. That is, a metal-based, mineral-based, or inorganic-based pigment is mixed with mortar to produce a color mortar, which is applied to the surface of concrete for 20 to 50 m.
This is a method of covering about m. However, the surface-coated mortar has the drawback that cracks are likely to occur and that it easily peels off when a forklift or the like travels.

Further, a method of rubbing a color material from the surface of concrete can be considered. That is, it is a method in which a powder pigment is sprinkled on the surface of concrete that has not yet solidified, and the surface of the concrete is rubbed using a metal iron or a machine. However, there are drawbacks that color unevenness occurs during rubbing, discoloration occurs due to abrasion of the surface, and fading occurs due to progress of abrasion.

Although a method of mixing pigments in green concrete can be considered in order to solve the above drawbacks, color unevenness cannot be eliminated only by mixing green concrete and pigments, and breathing occurs on the concrete surface. Then, the laitance increases, the surface strength decreases, the wear resistance is low,
Moreover, the problem of dust generation cannot be solved. Furthermore, just mixing a mixture of green concrete and a pigment results in poor water resistance and watertightness,
There is a problem of poor durability because it cannot prevent the permeation of acid, alkali, salt and oil from the concrete surface.

[0006]

Therefore, the present invention provides a color concrete composition which not only eliminates color unevenness but also is excellent in abrasion resistance, water resistance, watertightness and durability, and a method for producing the same. With the goal.

[0007]

A color concrete composition according to the present invention for solving the above-mentioned problems is characterized by mixing green concrete, a pigment and an aqueous dispersion composition.

A preferred aqueous dispersion composition is at least one selected from rubber latex, vinyl acetate emulsion and acrylic emulsion.

A more preferable aqueous dispersion composition is prepared by using at least one selected from the following (a) or (b) as a raw material and having a polymerization degree of 300 to 3,000 and a saponification degree of 7 as a dispersant.
0 to 98% of partially saponified polyvinyl alcohol which is swollen with water in advance and forms a sponge-like block is used, and the compounding ratio is raw material = 97 to 70 parts by weight, dispersant = 3 to 30.
It is obtained as parts by weight.

(A) Asphalt having a softening point of 160 ° C. or less (b) At least one kind of thermoplastic resin selected from the following (x) to (z) (x) Petroleum resin having a softening point of 160 ° C. or less (y) Softening point Ethylene / vinyl acetate copolymer resin (z) of 160 ° C or lower (z) Waste plastic having a melting point of 160 ° C or lower containing at least one selected from waste polyethylene, waste vinyl chloride, waste polystyrene, waste polypropylene, etc.

The method for producing a color concrete composition according to the present invention which solves the above-mentioned problems is characterized in that an aqueous dispersion composition is added and kneaded at the time of kneading a concrete raw material and a pigment, or after the kneading.

Further, the method for producing a color concrete composition according to the present invention which solves the above-mentioned problems, comprises a preheated kneading machine and at least one raw material selected from the above (a) or (b), Polymerization degree 300-3,000, saponification degree 7
The proportion of the partially saponified polyvinyl alcohol, which is 0 to 98% and swollen by being left to stand in water for 6 hours or more, is 97 to 70.
Parts by weight, partially saponified polyvinyl alcohol = 3 to 30 parts by weight, and then kneaded by applying a shearing force,
Next, a small amount of water is added to raise the temperature of the raw material to the softening point or higher, and after confirming the end point of the softening / mixing state of the raw material, water is added to produce an aqueous dispersion composition having a predetermined concentration, and then the concrete raw material is added. When the pigment is kneaded, or after the kneading, the above aqueous dispersion composition is added and kneaded.

The present invention will be described in detail below. The color concrete composition of the present invention is a mixture of green concrete, a pigment and an aqueous dispersion composition.

The ready-mixed concrete may be that used for ordinary concrete, and usually JIS standard products can be used. Examples of raw materials include cement, aggregate, AE
Agents and water reducing agents are used. As the cement, ordinary Portland cement, early-strength cement, blast-furnace cement, sulfate-resistant cement, etc. can be used, and as aggregate, river sand, river gravel, crushed sand, crushed stone, etc. can be used. Can use what is generally used. In blending green concrete, the water content for making the paste into a paste and the water content in the aqueous dispersion composition are reduced from the unit water content of the green concrete, or
Since the cement ratio is not changed, it is also preferable to increase the amount of cement corresponding to water.

As the pigment, any of inorganic pigments, metallic pigments and mineral pigments can be used. The amount of the pigment added varies depending on the type of the pigment, but it is standard to add 3 to 5% by weight with respect to the amount of cement in the color concrete, and the amount may be appropriately increased or decreased depending on the sharpness of the color. The pigment may be used as a powder as it is, or may be previously kneaded into a paste with water. A paste is preferred for dispersing the pigment. When kneading into a paste, pigment: water = 10
A blending ratio of 0:50 to 100 (weight ratio) is preferable.

As the aqueous dispersion composition, the following A type,
It is possible to arbitrarily use one kind or a combination of two or more kinds from the B series. Examples of the A-based aqueous dispersion composition include rubber latex, vinyl acetate emulsion, and acrylic emulsion.

Further, as the B-based aqueous dispersion composition, at least one selected from the following (a) or (b) is used as a raw material, and the dispersant has a degree of polymerization of 300 to 3,000 and a degree of saponification of 70 to 98%. And partially saponified polyvinyl alcohol that has been previously swollen with water to form a spongy block form (hereinafter,
Abbreviated as partial saponification poval if necessary. ) Was used and the compounding ratio was obtained with the raw material = 97 to 70 parts by weight and the dispersant = 3 to 30 parts by weight. (A) Asphalt having a softening point of 160 ° C. or lower (b) At least one thermoplastic resin selected from the following (x) to (z) (x) Petroleum resin having a softening point of 160 ° C. or lower (y) Softening point of 160 ° C. or lower Ethylene-vinyl acetate copolymer resin (z) Waste plastic with a melting point of 160 ° C or less containing at least one selected from waste polyethylene, waste vinyl chloride, waste polystyrene, waste polypropylene, etc.

The B-based aqueous dispersion composition preferably used in the present invention will be described below.

The asphalt which is the component (a) in the raw material includes petroleum asphalt and natural asphalt.
As petroleum asphalt, there are straight asphalt, blown asphalt, decolorized asphalt (white asphalt), and natural asphalt has tar sand. When asphalt with a softening point of over 160 ° C is used, the kneading machine is pressurized and the steam jacket temperature is increased. Even if the temperature is raised, water is added during the production, so that an aqueous dispersion is not obtained. Therefore, those having a softening point of 160 ° C. or lower are used. These may be used alone or in combination of two or more.

As the component (b), (x) softening point 160
Petroleum resin below ℃, (y) ethylene / vinyl acetate copolymer resin with softening point below 160 ℃, and (z) waste polyethylene,
At least one kind of thermoplastic resin selected from waste plastics having a melting point of 160 ° C. or lower and containing at least one kind selected from waste vinyl chloride, waste polystyrene, waste polypropylene and the like can be used.

The petroleum resin as the component (x) is C5 to C9.
A resin is preferable, and a C9 resin is more preferable, and if a petroleum resin having a softening point of more than 160 ° C. is used, water is added during the production even if the temperature of the steam jacket is raised by pressurizing the kneading machine, so that an aqueous dispersion liquid is obtained. Therefore, those having a softening point of 160 ° C. or less are used. These are 1
They may be used alone or in combination of two or more.

The waste plastic which is the component (z) is a mixture of the waste material of the polyethylene film for agriculture, the waste material of the styrofoam fish box and the waste material of the vinyl chloride sheet for construction.
Use the one softened by immersing it in a plasticizer (DBP),
(B) Place in a furnace, block oxygen, and keep at 500 ° C for 30
A wax having a softening point of about 100 ° C. and having a wax-like shape is used.

It is unavoidable that waste plastics include those having a softening point of more than 160 ° C., such as vinyl chloride. However, even if these are mixed, they are pyrolyzed once in a dry distillation pot as a pretreatment, and low molecular weight compounds are used. And the melting point (softening point) thereof may be lowered to 160 ° C. or lower. The melting point (softening point) of 160 ° C. or lower is 1
In the case of one kind or two or more kinds of waste plastic, it can be used as it is without pretreatment. By using the waste plastics composed of one kind or a combination of two or more kinds as a raw material, there is an effect of contributing to the recycling of industrial waste.

The thermoplastic resin having a softening point to a melting point of 160 ° C. or lower selected from (x) to (z) may be used alone or in combination of two or more. The compounding ratio of the raw material and the dispersant is preferably raw material = 97 to 70 parts by weight,
Dispersant = 3 to 30 parts by weight.

In the present invention, when a B-based aqueous dispersion composition is obtained, the dispersant has a degree of polymerization of 300 to 3,
000, a saponification degree of 70 to 98%, and a sponge-like blocked saponified poval which has been swollen with water in advance is used.
If a partially saponified Povar with a low degree of polymerization is used, the viscosity of the aqueous dispersion is reduced, whereas if a high degree is used, the emulsifying power is increased and the adhesive strength tends to increase in the use as a binder. As 300 ~
In the range of 3,000, preferably 1000-2,000
Range. On the other hand, those having a low degree of saponification tend to emulsify, while those having a high degree of saponification improve the heat resistance and water resistance of the adhesive surface. Therefore, depending on the use of the aqueous dispersion composition, the degree of saponification is 70 to 98.
%, Preferably 80 to 90% is preferably selected and used.

In the present invention, the sponge-like blocked saponified poval swelled with water specifically means a swelled and left standing time (swelling time) of more than 6 hours. . Regarding the dissolution time of the partially saponified Poval in water and its morphology, it has been found by the study of the present inventor that there is a relation described in Table 1 below.

[0027]

[Table 1]

Next, a method for producing the B-based aqueous dispersion composition will be described. First, the partially saponified poval and water are mixed and allowed to stand for more than 6 hours to swell the partially saponified poval into a sponge-like block form. When swelling partially saponified poval with water, if the mixing ratio of partially saponified poval and water is high, the emulsification action will be fast but the temperature of the kneader will not rise easily.
It is preferably 1: 0.5 to 3 (weight ratio), and more preferably partially saponified poval: water = 1: 1 to 2 (weight ratio). Also, the swelling time may be any number over 6 hours,
It is preferably 12 hours or more.

Next, the kneading machine is heated in advance. A kneader or a pressure kneader is used as the kneader, and an example using the kneader will be described below. The means for heating the kneader is not particularly limited, but there is a method of providing a steam jacket on the kneader, for example. If the initial temperature of the kneader is too high, the raw materials will soften and melt all at once, becoming an oil, and it will not mix with the dispersant to produce an aqueous dispersion, while if it is too low, it will take a long time to produce and the particle size Therefore, it is preferable that the softening point of the raw material components is around -10 ° C.

Then, the raw material and partially saponified poval are put into a preheated kneader. The order of introducing the raw material and the partially saponified poval is not particularly limited. The compounding ratio of the raw material and the partially saponified poval may be in the range described in the above aqueous dispersion composition. Among the raw materials, asphalt is preferably used in a liquid state by heating it, because if it is in a liquid state, the measuring property and workability are improved. The thermoplastic resin is usually used in the form of pellets or blocks, but the one having a low softening point may be liquid. Further, the waste plastic may be liquid or solid.

Next, the blade of the kneader is rotated, and sufficient shearing force is applied to knead. It is preferable to knead by adding such shearing until a starch syrup shape is obtained. Then, a small amount of water is added to heat the raw material to a temperature above the softening point. The heating temperature is preferably + 10 ° C to +2 of the softening point of the raw material.
It is in the range of 0 ° C. If the temperature is too high, the components will melt and become oily, making it impossible to produce an aqueous dispersion. The ingredients are completely mixed with the partially saponified poval by kneading under such heating.

Next, after confirming the end point of the softened / mixed state of the raw materials, water is added to produce an aqueous dispersion having a predetermined concentration. The end point is usually confirmed by visual inspection. The concentration of the aqueous dispersion is 20-
A range of 80% by weight is preferred. The above production is preferably carried out in one batch in a time of about 60 minutes. This is because if the length is too short, the particle size becomes coarse and the product variation increases, which is not preferable.

The B-based aqueous dispersion composition is a partially saponified poval swollen by being left to stand in water for more than 6 hours as a dispersant, that is, a partially saponified poval swollen to form a spongy block. Since the reason is not clear, the protective colloid is formed around the raw material in a short time. Therefore, the productivity is higher than before.

Compared with a conventional emulsion using a starch syrup-like partially saponified poval which has only swelled for less than 6 hours, the aqueous dispersion composition has less variation in concentration distribution and less change in viscosity with time, and a concrete with uniform components. Can be manufactured
As a result, concrete having excellent water resistance can be manufactured.
Further, since the protective colloid is formed in a short time, even if it is used immediately after manufacturing, it exhibits a waterproof function. Furthermore, since high-molecular-weight atactic polypropylene is not used as a raw material, it also has an effect of excellent weather resistance.

The compounding amount of the above aqueous dispersion composition in concrete is preferably 2 to 5% by weight in dry base with respect to the amount of cement in concrete. If it is less than 2% by weight, the effect of durability of the concrete is deteriorated, and if it exceeds 5% by weight, the amount of air entrained becomes large and the compressive strength is adversely affected.

In the present invention, in order to produce color concrete, for example, green concrete is put in a green concrete truck, and then the pigment as a powder or the pasty pigment and the aqueous dispersion composition are put in about 3 times. Mix by high speed stirring for ~ 5 minutes. Either the pigment or the aqueous dispersion composition may be added first, or both may be added at the same time.

Further, the aggregate, pigment, cement, water, AE water reducing agent, and aqueous dispersion composition are kneaded with a batcher of green plant. At this time, the order of addition to the batcher is not limited. Further, after kneading the aggregate, the pigment, the cement, the water and the AE water-reducing agent, the mixture is put into the ready-mixed concrete car, and then the aqueous dispersion composition is introduced from the hopper of the ready-mixed car and stirred at high speed for about 3 to 5 minutes. The latter method is preferable because there is no air entrainment.

The kneading time is preferably about 3 to 5 minutes. If the kneading time is longer than this, the air entrainment amount is large, and if it is too short, the mixing is incomplete.

The color concrete of the present invention includes soil concrete, concrete pavement, retaining wall, breakwater, breakwater,
It can be used for various kinds of concrete such as revetment, sand protection, dam, bridge, slope spraying, interlocking block, decorative block, revetment block, Machi block,
Curb block, pseudo stone, pseudo wood, color flat plate, L-shaped retaining wall, P
It can be used for secondary concrete products such as C plates and concrete poles.

[0040]

[Function] Since the color concrete composition is prepared by mixing the green concrete, the pigment and the aqueous dispersion composition, compared with the color concrete containing the green concrete and the pigment,
By using the aqueous dispersion composition, the dispersibility of the pigment is improved and the color unevenness is reduced. Since green concrete and pigment have different shapes and specific gravities, it is difficult to mix them and the dispersibility of the pigment is poor, and thus color unevenness is likely to occur, but when an A-based rubber latex or the like is used as the aqueous dispersion composition, The effect of preventing color unevenness can be seen.

When the B-based aqueous dispersion composition is used, the obtained polymer emulsion acts as a ball bearing to remarkably improve the dispersibility of the pigment and further prevent color unevenness. There is an improvement.

In addition, in concrete construction, it is preferable that the slump (JIS A 1101) is large and soft in order to improve the workability. However, in the color concrete mixed with green concrete and pigment, the slump is too small and hard, so that the workability is improved. Lack. On the other hand, A
When a system emulsion or the like is used, the workability is improved, but when the B-type polymer emulsion is used together with fresh concrete and a pigment,
Due to the ball bearing action, the slump becomes larger and softer, and the workability is significantly improved.

Further, excess water added to the green concrete for improving the workability seeps into the concrete surface and causes breathing. Colored concrete mixed with green concrete and pigment has a drawback that aggregates in green concrete are deposited due to a difference in specific gravity, causing bleeding on the concrete surface, and the lumpiness of the bleeding increases, causing spots on the surface. On the other hand, when the A-type emulsion is used, the stains are somewhat eliminated, but when the B-type polymer emulsion is further used, the latance due to breathing is further reduced and the problem of the stain is also caused. Will be resolved.

Further, in the present invention, as a result of the reduction of the leitance caused by breathing, the surface strength of concrete is improved, the abrasion resistance is improved, and the generation of dust can be prevented. Further, in the present invention, before the color concrete is solidified, breathing is prevented as described above, but in the solidified color concrete, the polymer fills the voids therein to prevent water from penetrating, and the water resistance and watertightness are improved. It is possible to improve and prevent the penetration of moisture from the outside. For example, it prevents groundwater from seeping out on the surface of soil color concrete due to a capillary phenomenon, and is therefore effective in preventing corrosion of internal reinforcing bars. Further, the thermal conductivity of the color concrete is lowered, and it is effective in preventing dew condensation and also preventing frost damage of the color concrete due to freezing of water absorption.

By improving the water resistance and watertightness as described above, it is possible to prevent the permeation of acid, alkali, salt and oil components, and prevent early deterioration due to neutralization of color concrete.

[0046]

EXAMPLES The present invention will now be described in more detail based on the examples of the present invention, but the present invention is not limited to the examples.

Synthesis Example (Production of Aqueous Dispersion Composition) First, Poval (manufactured by Nippon Synthetic Chemical Industry, Gohsenol G
L14) and water in a weight ratio of 1: 2 (Povar: water =
1: 2) was mixed and allowed to stand for 24 hours to produce a partially saponified poval swollen in a sponge-like block. The kneader was then heated to 80 ° C with steam.
To the heated kneader, 80 kg of a raw material in which straight asphalt (penetration: 60 to 80) was liquefied was put.
In addition, petroleum resin (Nippon Petrochemical Co., Ltd. Nisseki Neopolymer #
32 kg of the raw material obtained by pelletizing 90) was charged. Then, the previously swollen partially saponified poval is then added to 4
5 kg (15 kg in terms of Poval) was added. Then 8
Knead for about 10 minutes at a temperature of 0 ° C., then add about 10 kg of water, then add 80 kg of straight asphalt to the kneader again, close the kneader lid, and raise the temperature to 120 ° C.
The temperature was raised to. After about 20 minutes, after visually confirming that the kneading was sufficient, steam heating was stopped, water was gradually added, and 200 kg of water was added in about 30 minutes. The kneader temperature dropped to 50 ° C. Then, a bactericidal agent and a fungicide were added in predetermined amounts to produce an asphalt aqueous dispersion having a concentration of 50%.

Example 1 Soil color concrete for supermarkets in Niigata Prefecture was manufactured in the following manner.

(Raw material) Concrete 210-18-25N 210: Compressive strength (kg / cm ² ) 18: Slump (cm) 25: Maximum size of gravel (mm) N: Ordinary Portland cement pigment "Granufine" manufactured by Block Foods Co., Ltd. Yellow aqueous dispersion composition manufactured by the synthesis example

The above concrete, the pigment (5% by weight of the amount of cement) and the aqueous dispersion composition (6 kg per 1 m ^{3 of} concrete) were mixed for 5 minutes in a ready-mixed concrete truck and poured to produce a soil color concrete. For color concrete composition, breathing rate (JIS A 1122), slump
(JIS A 1101) and water absorption (JIS A 1404) are measured,
The color unevenness and the appearance of spots were visually evaluated.

The evaluation criteria for color unevenness and stain generation are as follows. Color unevenness ⊚: None at all ∘: Almost none ×: Excessive stains appear ◎: Absolutely none ∘: Almost none ×: Mostly observed The above measurement or evaluation results are shown in Table 2.

Example 2 A soil color concrete was produced in the same manner as in Example 1 except that the aqueous dispersion composition was changed to SBR latex (“SBR latex 0561” manufactured by JSR Corporation). SBR latex concrete 1m ³ per 6k
g was added. Table 2 shows the measurement or evaluation results.

Comparative Example 1 A soil color concrete was produced in the same manner as in Example 1 except that the aqueous dispersion composition was not added. Table 2 shows the measurement or evaluation results.

[0054]

[Table 2]

As is clear from Table 2, in the soil color concrete of Comparative Example 1 in which the aqueous dispersion composition was not used,
Breathing occurs severely, slump is greatly reduced, and workability is lacking. In addition, since the water absorption rate is high, it lacks water resistance and watertightness. Furthermore, the color unevenness is terrible and the stains are also terrible. On the other hand, in Example 2 using SBR latex, the occurrence of breathing is reduced, the slump is reduced less, and the water absorption is also reduced. Furthermore, the unevenness in color and the appearance of stains have been slightly improved. Further, in Example 1 using the aqueous dispersion composition produced in the Synthesis Example, the occurrence of breathing was further reduced, the slump was not reduced at all, and the water absorption rate was also lower than that in Example 2. And the stains are completely gone.

Example 3 A colored concrete block used as a pedestrian road boundary concrete block was manufactured in the following manner.

(Raw material) Concrete 160-10-10N Pigment "Granufin" yellow manufactured by Block Foods Co., Ltd. Yellow aqueous dispersion composition

The above concrete, the pigment (3% by weight of the amount of cement) and the aqueous dispersion composition (6 kg per 1 m ^{3 of} concrete) were mixed for 5 minutes with a factory mixer, poured into a mold, and after vibration was applied. The mold was demolded by aging for 12 hours in a steam chamber at 75 ° C. The surface of the concrete block was visually evaluated for color unevenness and spots.
Table 3 shows the above evaluation results.

Example 4 A colored concrete block was produced in the same manner as in Example 3 except that the aqueous dispersion composition was replaced with an acrylic / styrene copolymer resin emulsion (“Acronal 295DN” manufactured by Mitsubishi Chemical BASF). . The acrylic / styrene copolymer resin emulsion was added in an amount of 6 kg per 1 m ³ of concrete. Table 3 shows the evaluation results.

Comparative Example 2 A colored concrete block was produced in the same manner as in Example 3 except that the aqueous dispersion composition was not added.
Table 3 shows the evaluation results.

[0061]

[Table 3]

As is clear from Table 3, in the color concrete block of Comparative Example 2 in which the aqueous dispersion composition was not used, the color unevenness was severe and the stains were severe. In contrast,
In Example 4 in which the acrylic / styrene copolymer resin emulsion was used, color unevenness was eliminated, and the appearance of spots was slightly improved. Further, in Example 3 using the aqueous dispersion composition produced in the synthesis example, both color unevenness and stain generation are completely eliminated.

[0063]

EFFECTS OF THE INVENTION According to the present invention, it is possible not only to solve both color unevenness and stain generation at the same time, but also wear resistance, water resistance,
A color concrete composition having excellent watertightness and durability and a method for producing the same can be provided.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display area // C04B 103: 54

Claims (5)

[Claims] 1. A color concrete composition comprising a mixture of green concrete, a pigment and an aqueous dispersion composition. 2. The color concrete composition according to claim 1, wherein the aqueous dispersion composition is at least one selected from rubber latex, vinyl acetate emulsion and acrylic emulsion. 3. An aqueous dispersion composition comprising at least one selected from the following (a) or (b) as a raw material and having a degree of polymerization of 300 to 3,000 and a degree of saponification of 70 to 98% as a dispersant.
That is, it is obtained by using partially saponified polyvinyl alcohol which is swollen with water in advance and forms a spongy block form, and the compounding ratio is as follows: raw material = 97 to 70 parts by weight, dispersant = 3 to 30 parts by weight. The colored concrete composition according to claim 1, which is characterized in that. (A) Asphalt having a softening point of 160 ° C. or lower (b) At least one thermoplastic resin selected from the following (x) to (z) (x) Petroleum resin having a softening point of 160 ° C. or lower (y) Softening point of 160 ° C. or lower Ethylene-vinyl acetate copolymer resin (z) Waste plastic with a melting point of 160 ° C or lower containing at least one selected from waste polyethylene, waste vinyl chloride, waste polystyrene, waste polypropylene, etc. 4. A method for producing a color concrete composition, characterized in that an aqueous dispersion composition is added and kneaded when kneading a concrete raw material and a pigment or after kneading. 5. A kneader preheated, and at least one raw material selected from the following (a) or (b), and a polymerization degree of 3
The compounding ratio of the partially saponified polyvinyl alcohol having a saponification degree of 0 to 3,000 and a saponification degree of 70 to 98% and swollen in water for more than 6 hours is 97 to 70 parts by weight. , Partially saponified polyvinyl alcohol = 3 to 30 parts by weight, kneading by applying shearing force, then adding a small amount of water to raise the temperature of the raw material to the softening point or higher, and then softening / mixing state of the raw material After confirming the end point of, to produce an aqueous dispersion composition of a predetermined concentration by adding water, then when kneading the concrete raw material and the pigment, or after kneading, adding the aqueous dispersion composition and kneading A method for producing a characteristic colored concrete composition. (A) Asphalt having a softening point of 160 ° C. or lower (b) At least one thermoplastic resin selected from the following (x) to (z) (x) Petroleum resin having a softening point of 160 ° C. or lower (y) Softening point of 160 ° C. or lower Ethylene-vinyl acetate copolymer resin (z) Waste plastic with a melting point of 160 ° C or lower containing at least one selected from waste polyethylene, waste vinyl chloride, waste polystyrene, waste polypropylene, etc.