JPH1171157A - Hydraulic composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a hydraulic composition for extremely improving application workability without causing problems of increase in dry contraction coefficient, water absorption ratio and bleeding ratio resulting from increase in water amount in a conventional method. SOLUTION: This composition comprises (a) an aqueous dispersion composition composed of at least one kind of a raw material selected from an asphalt having <=160 deg.C softening point, a petroleum resin or an ethylene/vinyl acetate copolymer resin and a waste plastic having <=160 deg.C melting point, a dispersant made of a spongy blocked partially saponified polyvinyl alcohol having 300-3,000 polymerization degree and 70-98% degree of saponification, previously swollen with water and a naphthalenesulfonic acid-based, a melamine sulfonic acid-based or a polycarboxylic acid-based fluidizing agent, (b) a hydraulic material and (c) at least one selected from the group consisting of steel fiber, glass fiber, rock wool, asbestos and inorganic fiber.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a hydraulic composition, and more particularly to a hydraulic composition which greatly improves workability.

[0002]

2. Description of the Related Art Conventionally, hydraulic compositions have been mainly composed of hydraulic substances such as cement and aggregates such as sand and gravel. Aqueous dispersion compositions called emulsions have come to be used.

The present inventor has previously described Japanese Patent Application No. 6-120652.
No., raw materials such as asphalt and petroleum resin having a softening point of 160 ° C. or less, a polymerization degree of 300 to 3000, and a saponification degree of 70 to
An aqueous dispersion composition comprising 98% and a dispersant consisting of a partially saponified polyvinyl alcohol which has been swollen in advance with water and made into a spongy block has been proposed. This aqueous dispersion composition was excellent in water resistance, waterproofness, and adhesiveness, and was an epoch-making one exhibiting a waterproof adhesive function even when used immediately after production.

[0004] On the other hand, techniques for containing reinforcing fibers in hydraulic compositions have also been tried, for example, slope-side reinforced concrete, concrete for primary spraying of tunnels, concrete for secondary lining of tunnels, concrete for slab flooring and the like. The technology of including steel fibers in the hydraulic composition of the present invention is known.

However, when the hydraulic composition contains steel fibers, the slump value is reduced to 4 cm, as is apparent from the comparative examples, and there is a problem that the hydraulic composition (concrete) cannot be cast. In order to improve this, when the aqueous dispersion composition proposed earlier by the present inventor was added, the slump value was improved, but it was only 2 cm, which was not enough for the concrete casting operation.

For this reason, when producing a hydraulic composition, as in Reference Example 1, the slump value was restored to 18 cm by increasing the amount of water, and the casting operation was performed. However, when the amount of water is increased, as in Reference Example 1, the drying shrinkage rate increases, causing cracking of the concrete, and the water absorption rate increases, causing water leakage of the concrete, and further increasing the breathing rate, resulting in the generation of dust. However, there is a problem that a fragile layer is formed on the concrete surface. On the other hand, in Reference Example 1 in which the amount of water was increased, even if steel fibers were added as in Reference Example 2, the slump value was lowered and the construction work was hindered. There is a problem that the slump value does not increase unless the amount of water is increased even if the aqueous dispersion composition other than the present invention is added.

[0007]

Accordingly, an object of the present invention is to provide a conventional drying shrinkage ratio by increasing the amount of water,
An object of the present invention is to provide a hydraulic composition which does not cause a problem of an increase in a water absorption rate and a breathing rate and greatly improves workability.

[0008]

Means for Solving the Problems A hydraulic composition according to the present invention for solving the above-mentioned problems is characterized by containing the following (a), (b) and (c).

(A) At least one raw material selected from asphalt, petroleum resin, ethylene / vinyl acetate copolymer resin or waste plastic having a softening point of 160 ° C. or less, a polymerization degree of 300 to 3000, and a saponification degree of 70 to 98%. Sponge-blocked partially saponified polyvinyl alcohol swollen with water in advance (sometimes called poval)
An aqueous dispersion composition comprising a dispersant consisting of: a naphthalenesulfonic acid-based, melaminesulfonic acid-based, or polycarboxylic acid-based fluidizer; (b) a hydraulic material; (c) steel fiber, glass fiber, rock wool, At least one selected from asbestos or inorganic fibers In a preferred embodiment of the present invention, the mixing ratio of each composition constituting the aqueous dispersion composition is as follows: raw material: dispersant: fluidizing agent =
84 to 97: 2 to 10: 1 to 6 (weight ratio).

[0010] In another preferred embodiment of the present invention,
The hydraulic composition contains (a) 0.2 to 5 parts by weight as a dry weight ratio with respect to (b) 100 parts by weight, and (c) contains 5 to 50 kg / m with respect to the total hydraulic composition. ^{3 is to} include.

In another preferred embodiment of the present invention,
(C) is a steel fiber having a wire length of 15 to 100 mm.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, the aqueous dispersion composition as the component (a) comprises at least one selected from asphalt having a softening point of 160 ° C. or lower, petroleum resin, ethylene-vinyl acetate copolymer resin or waste plastic. It contains seed materials, a dispersant, and a fluidizing agent.

Asphalt in the raw material includes petroleum asphalt and natural asphalt. Examples of petroleum asphalt include straight asphalt, blown asphalt, and decolorized asphalt (white asphalt), and examples of natural asphalt include tar sands. These may be used alone or in combination of two or more.

As the petroleum resin, a C ₅ -C ₉ resin is preferable, and a C ₉ resin is more preferable.

As waste plastic, waste polyethylene,
Those having a melting point or softening point of 160 ° C. or less selected from waste vinyl chloride or waste polystyrene are used. If the melting point or softening point of vinyl chloride or the like exceeds 160 ° C., it is thermally decomposed once in a dry still as a pretreatment to reduce the molecular weight and lower the melting point (softening point) to 160 ° C. or less. Processing is required. By using such waste plastic as a raw material, it contributes to the recycling of industrial waste.

As the dispersant, the polymerization degree is 300 to 300.
0, a dispersant having a degree of saponification of 70 to 98% and consisting of a partially saponified poval that has been swollen in advance with water and is in the form of a sponge is used. When a partially saponified povar having a low degree of polymerization is used, the viscosity of the aqueous dispersion is reduced.On the other hand, when a high saponified one is used, the emulsifying power increases and the adhesive strength tends to increase in a binder application. In the range of 300 to 3000, preferably 500 to 20
Within the range of 00, it is preferable to use one having a different degree of polymerization depending on the use of the hydraulic composition of the present invention. A low saponification degree is easy to emulsify, while a high saponification degree improves the heat resistance and water resistance of the bonding surface. Therefore, depending on the use of the hydraulic composition, the saponification degree is in the range of 70 to 98%, preferably 80 to 90%. It is preferable to select and use within the range.

In the present invention, the partially saponified poval that has been swollen with water and formed into a sponge-like block means, specifically, a material that has a swelling time and a standing time (swelling time) of more than 6 hours. .

A study by the present inventors has revealed that the relationship between the dissolution time of partially saponified poval in water and the form thereof has the relationship shown in Table 1 below.

[0019]

[Table 1]

As the fluidizer, a naphthalenesulfonic acid-based, melaminesulfonic acid-based or polycarboxylic acid-based fluidizer is used, and preferably, a polycarboxylic acid-based fluidizer is used.

The composition ratio of each composition constituting the aqueous dispersion composition used in the present invention is as follows: raw material: dispersant: fluidizing agent =
It is preferably from 84 to 97: 2 to 10: 1 to 6 (weight ratio), more preferably from 88 to 95: 3 to 7: 2 to 5
(Weight ratio).

In addition to the above, an alkyl acrylate / styrene copolymer or a synthetic rubber may be added to the aqueous dispersion composition used in the present invention within the scope of the present invention, depending on the application.

As the aqueous dispersion composition, a commercially available product can be used. For example, "Brazic-" manufactured by Tokiwa Chemical Co., Ltd. can be used.
It is preferable to use “CF”.

In the present invention, as the hydraulic material which is the component (b), any inorganic material which cures by reacting with water can be used, and is not particularly limited. Preferred examples of the hydraulic material include various portland cements, blast furnace cements, alumina cements, blast furnace slag, fly ash, mixed cements mixed with silica, gypsum, slag slag, calcium hydroxide, magnesium carbonate, silicate Calcium and the like can be mentioned, and only one of those hydraulic substances may be used, or two or more thereof may be used in combination. In particular, in the present invention, it is preferable to use cement as the hydraulic substance.

As the component (c), at least one selected from steel fibers, glass fibers, rock wool, asbestos or inorganic fibers (for example, carbon fibers) is used, and these may be used in combination.

Particularly preferred as the component (c) is a steel fiber having a wire length of 15 to 100 mm. Line length is 1
It is preferable that the thickness be in the range of 5 to 100 mm, since the dispersibility in the hydraulic composition, the reinforcing effect, the crack generation preventing effect, the increase in bending strength, and the like are exhibited.

The material of the steel fiber is JIS G 3505.
It is preferable that the mild steel wire material corresponding to the above is cold drawn, and the material is preferably a material corresponding to JIS G 3532. Further, the tensile strength of the steel fiber is 50 kgf / mm ² or more, preferably 80 kgf / mm ² or more,
kgf / mm ² or more is more preferable.

Further, the diameter of the steel fiber is preferably in the range of 0.2 to 2.0 mm. Here, the “diameter” refers to the diameter when the steel fiber is converted into a circle when the steel fiber is other than a circle.

The shape of the steel fiber is not particularly limited, and for example, various shapes shown in Table 2 below can be used.

[0030]

[Table 2]

In the present invention, commercially available steel fibers can be used, and for example, "Doma Ace" manufactured by Kobe Steel and "Doramix" manufactured by Bridgestone can be used.

The hydraulic composition of the present invention comprises, besides the above-mentioned components, one of the other components usually used in hydraulic compositions.
Species or two or more kinds may be contained as needed.
Examples of such other ingredients include inorganic fillers and lightweight aggregates such as glass balloons, shirasu balloons, fly ash, sand, gravel, perlite, polystyrene beads,
Examples thereof include a water-soluble cellulose resin and other thickeners.

The component (a) in the hydraulic composition of the present invention preferably contains 0.2 to 5 parts by weight, more preferably 0.5 to 5 parts by weight, as a dry weight ratio based on 100 parts by weight of the component (b). 1.5 parts by weight.

If the amount of the component (a) is less than 0.2 parts by weight, the hydraulic composition tends to shrink during drying, and concrete obtained by hydrating and hardening the hydraulic composition. The water absorption and the water permeability of the water-cured product and the water-cured molded product of the above are increased, and the waterproofness and moisture-proofness are easily reduced.

On the other hand, when the amount exceeds 5 parts by weight, the amount of entrained air into the hydraulic composition increases, and the initial curing speed of the hydraulic composition is delayed, and the compressive strength of the hydraulic composition and the hydraulic composition decreases. In addition, the water-hardened product or the water-hardened molded product does not have much improved waterproofing and moisture-proofing properties even though it is blended in a large amount, and shrinkage during drying tends to increase.

The component (c) preferably contains 5 to 50 kg / m ³ , more preferably 15 to 40 kg / m ³ , based on the total hydraulic composition. If it is less than 5 kg / m ^3, it is difficult to prevent the occurrence of cracks, the bending strength is insufficient, and the reinforcing bar is not omitted. When it exceeds 50 kg / m ³ , it is difficult to uniformly disperse the composition in the hydraulic composition, and fiber balls are generated, whereby the workability is reduced, and the quality of the hydraulic composition is likely to be uneven.

To prepare the hydraulic composition of the present invention, the above components (a), (b) and (c), and if necessary, aggregate and other components are mixed with water. Thus, a hydraulic composition containing water is prepared.

In the present invention, when preparing a hydraulic composition, a slump value suitable for work can be obtained without increasing the water content. The water content of a conventionally known hydraulic composition is about 70% by weight with respect to the weight of the hydraulic substance (a), but in order to obtain the same slump value, it may be about 65% by weight in the present invention.

The above components (a), (b) and (c)
In preparing the hydraulic composition by mixing the components, aggregates and other components that are added as necessary in a mixing device, the mixing method and mixing order of each component are not particularly limited, and Any method can be adopted as long as the components can be uniformly mixed.For example, a method of simultaneously mixing all components, a method of sequentially mixing each component, and a method of mixing some of the components in advance and mixing A method of mixing the remaining components can be used.

Among them, it is preferable to previously mix the component (b), the component (c), the aggregate and water, and then add the component (a) and mix them again, since mixing is easy and a fiber ball is not formed.

The mixing apparatus used for preparing the hydraulic composition is not particularly limited, and a conventionally known mixing apparatus can be used according to the use, application method, usage mode, and the like of the hydraulic composition. For example, a concrete mixer, a screw-type kneader, a peller-type kneader, or the like can be used.

Then, using the hydraulic composition prepared as described above, at each site, one or more of methods such as casting, coating (coating), spraying, etc. are employed to obtain a water-curable composition. An object (concrete or concrete structure) can be formed. At that time, the hydraulic composition was poured, coated, and / or
Alternatively, spraying or the like can be performed in the same manner as a conventionally known method of applying a hydraulic composition, and is not particularly limited. Next, the hydraulic composition applied on site is cured and dried in the same manner as a conventionally known method to form a cured product.

Using the hydraulic composition of the present invention, for example,
Production of buildings on site, formation of floors, walls, and roofs in buildings, road pavement, tunnel lining, slope protection, etc. can be performed smoothly.

The hydraulic composition of the present invention may be used for the production of a water-cured molded product, instead of being directly applied on site. The molding method in that case is not particularly limited, and any method conventionally used in the production of a water-cured molded product can be adopted, for example, a mold forming method, an extrusion molding method, a paper forming method, a flow-on method, a dry method. And the like.
Then, the final molded product is cured by curing the molded product obtained thereby. The curing method at that time is not particularly limited, and any of the conventionally known curing methods can be employed, and examples thereof include an autoclave curing, a steam curing, a natural curing, and a combination thereof.

The water-cured molded product obtained as described above can be widely used in various fields such as construction, civil engineering, ships and the like, and particularly, its excellent waterproofness, moistureproofness, crack resistance,
Taking advantage of mechanical properties, etc., roofs, outer walls, inner walls, flooring,
It can be used very effectively as a building material for gates, road blocks, revetment blocks, etc.

[0046]

The present invention will now be described by way of examples, which should not be construed as limiting the invention.

Example 1 (1) Portland cement (Sumitomo Osaka Cement) 277 parts by weight River sand (coarse particle size 2.83%) 835 parts by weight Gravel (coarse particle size 6.76) %) 994 parts by weight Water 166 parts by weight AE water reducing agent 0.554 parts by weight was charged all at once, operated and mixed for 60 seconds. (2) Next, 30 parts by weight of the following steel fiber was added to the mixture of (1), and the mixture was operated and mixed for 60 seconds.

Steel fiber “Doramix ZW60 / 80” manufactured by Bridgestone Corp. Length 60 mm Diameter 0.8 mm Tensile strength 120 kgf / mm ² (3) Next, the following aqueous dispersion composition was added to the mixture of (2). 6 parts by weight of the product were added and operated and mixed for 30 seconds to obtain a hydraulic composition.

As the aqueous dispersion composition, "BRAZIC-CF" manufactured by Tokiwa Chemical Co., Ltd. was used. This composition had a solid content of 52% by weight and had a softening point (Vicat softening point according to JIS K 7206) of 16 as a raw material.
Asphalt and petroleum resin of 0 ° C or less are used. As a dispersant, a partially saponified poval having a degree of polymerization of 500 and a saponification degree of 88%, which has been swollen with water and sponge-formed in advance, and a polycarboxylic acid-based fluidizing agent Was used. (4) Slump value of the hydraulic composition obtained in the above (3),
The breathing rate and the drying shrinkage rate were measured. Table 3 shows the results.

Further, the above-mentioned hydraulic composition was cast to obtain a water-cured product, and the compressive strength, bending strength and water absorption of the water-cured product were measured. Table 3 shows the results.

In the above Examples, the slump value, the breathing rate, the drying shrinkage, the compressive strength, the bending strength, and the water absorption of the hydraulic composition were measured as follows.

(I) Slump value of hydraulic composition: The hydraulic composition was divided into 1/3 volume slump cones having a height of 30 cm, a lower end inner diameter of 20 cm and an upper end inner diameter of 10 cm, each 25 times with a standard rod. After stuffing while pushing, the slump cone was pulled up vertically and pulled out, and the height from the bottom to the top of the hydraulic composition at that time was measured to obtain a slump value (cm).

(Ii) Breathing rate of hydraulic composition: J
It was measured according to IS A 1122.

(Iii) Drying shrinkage of hydraulic composition: "Standards for Test Methods for Fiber Reinforced Concrete", pp. 1-2 (edited by Japan Concrete Institute; February 1984)
According to the method described in the above), the hydraulic composition is poured into a steel mold having a size of 10 cm × 10 cm × 40 cm, left as it is for one day, and then demolded to obtain a length × width × length = 10 cm.
Form a prismatic body of × 10cm × 40cm,
After being cured in water for 7 days, it was taken out of the water, and the distance (L ₀ ) between two points marked on the side surface of the prism by a concrete gauge was measured.

Then, the cured prism was placed at a temperature of 20 ° C. ±
It was left to dry in a constant temperature room at 3 ° C. and a humidity of 60% ± 5%. After 26 weeks, the distance (L ₁ ) between the two points marked above was measured, and (L ₀ −L ₁ ) / L ₀ = calculated from the equation of dry shrinkage.

(Iv) Compressive strength of the water-hardened material: The hydraulic composition was poured into a steel mold having a diameter × height = 10 cm × 20 cm, left for one day, and then demolded. Cured in water for 7 days. After curing, take out from the water, put it in a hot air dryer (hot air temperature 80 ° C), dry it for 2 days, take it out, let it cool down to room temperature, and determine the compressive strength of the resulting water-cured product in Japan. The measurement was carried out according to the method shown in "Compression strength test method" edited by the Japan Concrete Institute.

(V) Flexural strength of the cured product: JIS A
It was measured according to the bending strength test of 1106.

(Vi) Water absorption of water-cured product: The hydraulic composition was poured into a steel mold having a size of 10 cm × 10 cm × 40 cm, allowed to stand for one day, and then removed from the mold to obtain a length × width ×
After forming a prism having a length of 10 cm × 10 cm × 40 cm, curing it in water at 20 ° C. for 7 days, taking it out of the water, putting it in a hot air dryer (hot air temperature of 80 ° C.) and drying it for 2 days, It was taken out and allowed to cool to room temperature, and the weight (W ₂ ) of the prism at that time was measured.

The prism whose weight was measured above was replaced with 20 prisms.
After immersing in water at 48 ° C for 48 hours, take out from the water,
After wiping off quickly tissue paper to water adhering to the surface, immediately measure the weight (W _3),
{(W ₃ −W ₂ ) / W ₂ } × 100 = Water absorption was calculated from the equation of water absorption (%) of the cured product.

Comparative Example 1 A hydraulic composition and a cured product were obtained in the same manner as in Example 1 except that the aqueous dispersion composition and the steel fiber were not used. Table 3 shows the slump value, the breathing rate, the drying shrinkage rate, the compressive strength, the bending strength, and the water absorption rate of the cured product of the hydraulic composition.

Comparative Example 2 A hydraulic composition and a cured product were obtained in the same manner as in Example 1 except that no steel fiber was used. Table 3 shows the slump value, the breathing rate, the drying shrinkage rate, the compressive strength, the bending strength, and the water absorption rate of the cured product of the hydraulic composition.

Comparative Example 3 A hydraulic composition and a cured product were obtained in the same manner as in Example 1, except that the aqueous dispersion composition was not used. Table 3 shows the slump value, the breathing rate, the drying shrinkage rate, the compressive strength, the bending strength, and the water absorption rate of the cured product of the hydraulic composition.

Example 2 A hydraulic composition and a cured product were obtained in the same manner as in Example 1 except that the steel fibers used in the step (2) were changed to the following steel fibers. Steel fiber “Doma Ace” manufactured by Kobe Steel Ltd. Length 50 mm Diameter 0.8 mm Tensile strength 100 kgf / mm ²

The hydraulic composition has a slump value and a breathing rate, a drying shrinkage rate, a compressive strength, a bending strength, and a
Table 3 shows the water absorption.

REFERENCE EXAMPLE 1 In the same manner as in Example 1, except that the raw materials put in the tilting mixer were changed as follows, and the steel fiber and the aqueous dispersion composition were not used, the hydraulic composition and the water setting I got something. Slump value and breathing rate of hydraulic composition,
Table 3 shows the drying shrinkage, the compressive strength, the bending strength, and the water absorption of the cured product.

Portland cement (manufactured by Sumitomo Osaka Cement) 294 parts by weight River sand (coarse particle size 2.83%) 853 parts by weight Gravel (coarse particle size 6.76%) 937 parts by weight Water 176 parts by weight AE water reducing agent 0.558 Parts by weight

Reference Example 2 A hydraulic composition and a cured product were obtained in the same manner as in Reference Example 1, except that the steel fiber was used as in Example 1. Slump value and breathing rate of hydraulic composition,
Table 3 shows the drying shrinkage, the compressive strength, the bending strength, and the water absorption of the cured product.

Reference Example 3 In Reference Example 1, the steel fiber (same as that used in Example 1) and the aqueous dispersion composition (the aqueous dispersion composition used in Example 1 except for the fluidizing agent) were used. A hydraulic composition and a water-cured product were obtained in the same manner except that "Brazic-C" manufactured by Tokiwa Chemical Co., Ltd.) was used as in Example 1. Table 3 shows the slump value, the breathing rate, the drying shrinkage rate, the compressive strength, the bending strength, and the water absorption rate of the cured product of the hydraulic composition.

Example 3 A hydraulic composition and a cured product were obtained in the same manner as in Example 1 except that no AE water reducing agent was used. Table 3 shows the slump value, the breathing rate, the drying shrinkage rate, the compressive strength, the bending strength, and the water absorption rate of the cured product of the hydraulic composition.

[0070]

[Table 3]

The following becomes clear from Table 3. That is, in general, when concrete is cast, the slump value is set at about 18 cm, and the composition of the concrete is referred to in Reference Example 1.
Decide as follows.

When steel fibers were mixed in this composition, Reference Example 2
As shown in the above, the slump value becomes 4 cm down to 14 cm, and it becomes very difficult to put concrete between the soils.

Further, as in Reference Example 3, the addition of "Brazic-C" manufactured by Tokiwa Chemical Co., Ltd.
m and recovers 2 cm. Although it is not easy, it is in a state where the concrete can be poured. In other words, when steel fibers and "Brazik-C" are added to concrete, the formulation of the concrete requires water corresponding to a slump value of 18 cm.

As compared with Reference Example 3, the amount of water used for concrete was further reduced, the breathing rate was small (the surface has a weak layer and there was no dust), the drying shrinkage was small (the number of cracks was small), and the water absorption was small. Example 1 provides a hydraulic composition having a small water content (high waterproof and moisture-proof properties, and also has a rust-preventing effect on reinforcing steel). Further, in Example 1, the compressive strength of the obtained hydraulic material is increased as compared with Reference Example 3, so that there is an effect of reducing the amount of cement used, and the slump value is also very easy to be cast as 20 cm. Become. The effect of Example 1 is largely attributable to the use of "Brazic-CF" manufactured by Tokiwa Chemical Co. as an aqueous dispersion composition.

From the formulation of Example 1, it was found that "Brazic-C
Except for "F", the slump value drops by 5 to 9 cm, making it almost impossible to cast concrete (Comparative Example 1,
3). Further, the breathing rate, drying shrinkage rate and water absorption rate are remarkably deteriorated.

Excluding the steel fibers from the composition of Example 1, the bending strength is significantly reduced (Comparative Examples 1 and 2). Example 2 is an example in which the type of steel fiber is changed, but there is no difference in performance from Example 1, and the effect of the present invention is exhibited.

Since "BRAZIC-CF" also has a high-performance water reducing agent function, even when the AE water reducing agent used in Example 1 is not used as in Example 3, various performances are slightly reduced. And exhibit the effect of the present invention.

[0078]

According to the hydraulic composition of the present invention, the effects of excellent workability, low breathing rate, low drying shrinkage rate and low occurrence of cracks can be obtained. Has a low water absorption and water permeability, is excellent in waterproofness and moistureproofness, exhibits a rust-preventing effect on a reinforcing bar, improves durability, has an effect of having less fragile layer on the surface and excellent in dustproofness.

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Claims (4)

[Claims] 1. A hydraulic composition comprising the following (a), (b) and (c). (A) Asphalt, petroleum resin or ethylene-vinyl acetate copolymer resin having a softening point of 160 ° C. or less or a melting point of 16
At least one raw material selected from waste plastics having a temperature of 0 ° C. or lower, a degree of polymerization of 300 to 3000, and a degree of saponification of 70 to 98;
% Aqueous dispersion composition comprising a dispersant consisting of a partially saponified polyvinyl alcohol which has been swollen with water in advance and which has been blocked into a sponge form, and a naphthalenesulfonic acid-based, melaminesulfonic acid-based or polycarboxylic acid-based fluidizing agent. (B) hydraulic substance (c) at least one selected from steel fibers, glass fibers, rock wool, asbestos or inorganic fibers 2. The composition ratio of each composition constituting the aqueous dispersion composition is as follows: raw material: dispersant: fluidizer = 84 to 97: 2 to 1
2. The composition according to claim 1, wherein the ratio is 0: 1 to 6 (weight ratio).
The hydraulic composition as described in the above. 3. The hydraulic composition contains 0.2 to 5 parts by weight of (a) as a dry weight ratio based on 100 parts by weight of (b).
And (c) is 5 to 50 kg / m with respect to the total hydraulic composition.
^{3. The} hydraulic composition according to claim 1, wherein the composition comprises ^three . 4. The hydraulic composition according to claim 1, wherein (c) is a steel fiber having a wire length of 15 to 100 mm.