KR20070083874A - Composition for ground-improving material, grouting material comprising the same, and method of using the same - Google Patents

Abstract

A composition for a ground-improving material which is extensively utilizable in ground improvement works, cutoff works, etc. and is excellent in penetrativity and durability; and a grouting material which comprises the composition and is highly penetrative into the ground. The composition for ground-improving materials is characterized by containing a blast-furnace fume. Desirably, it contains silica fume and further contains cement or calcium hydroxide. Preferably, it contains cement and an alkali-thickenable polymer emulsion.

Description

Composition for ground improvement material, injection material using the same and method of using the same {COMPOSITION FOR GROUND-IMPROVING MATERIAL, GROUTING MATERIAL COMPRISING THE SAME, AND METHOD OF USING THE SAME}

TECHNICAL FIELD This invention relates to the effective use method of blast furnace fume, the ground improvement material composition widely used by the ground improvement work, the exploration work, etc. in the civil engineering and construction industry, their preparation method, and the injection material which uses them.

In recent years, environmental problems are greatly close, and in particular, various attempts have been made regarding the effective use of industrial by-products. Among them, blast furnace slug sludge, fly ash, silica fume, and the like have already been established for many effective methods, for example, are mixed with a large amount of portland cement and used in JIS.

However, there are many industrial by-products for which the effective usage method is still not established, and the establishment of the usage method is strongly demanded for the construction of a circular society.

One example thereof is blast furnace fume.

Blast furnace fume is a by-product which arises in the manufacturing process of steel, and is dust which collected the fume produced from the blast furnace when obtaining pig iron. As an effective utilization method of blast furnace fume, it has been proposed so far as a mixed material used for glass fiber reinforced cement composites (refer patent document 1, patent document 2). However, blast furnace fume contains alkali metal, and in the present state, use of concrete is difficult because of fear of alkali aggregate reaction, and it is desired to establish the method of use.

On the other hand, the ground improvement material is widely used for ground improvement construction, waterworks construction, etc.

Ground improvement work is ground improvement work by injection of chemical liquid at the time of construction of soft ground, curtain grout of foundation ground reinforcement of large special structure such as dam and power plant, and underground structures such as tunnel, oil and LPG stockpile base. Index construction is construction that prevents water generated during excavation work of underground structures in places below sea level, subsea level, and algebraic ground by injecting injection material or injects ground improvement material to increase soil water tightness. . In addition to these, there are constructions for preventing the collapse of the ground in general homes in poorly drained grounds or liquefaction grounds, ground improvement of mansions, and infrastructure maintenance such as water and sewage.

The ground improvement material is widely used for these constructions, and refers to a material used for the purpose of strengthening the ground by solidifying the ground or consolidating and dehydrating the ground.

Next, a concrete example is given and demonstrated about the above ground improvement material and the construction using the same.

For example, in the tunneling of the tunnel, a cavity may be generated on the back surface of the concrete for construction after construction or after construction. If the cavity is left as it is, the ground surface is settled with the collapse of the acid in the cavity. In the case of severe collapse of the acid, deformed or destroyed the perforated concrete, in particular, the collapse of the tunnel, the deterioration of the perforated concrete due to the inflow of groundwater into the cavity, and the accompanying deterioration in the traveling lane of the deteriorated concrete There has been a problem that the driving lane is frozen in the winter season due to leakage from the crack part.

In recent years, there has been a backfilling injection method for filling a cavity in the back surface of a perforated concrete and stabilizing the tunnel during tunnel repair work in which the number of constructions is increasing. The injection material used here is called a back peeling material, and cement-bentonite has conventionally been generally used. However, there is a problem that the fluidity is so large that the backfilling material flows unnecessarily to a distant place, or if the backfilling material flows out if water is used, the backfilling material flows out or is diluted to decrease the physical properties.

Then, the method of adding a superabsorbent resin to the main material of cement and bentonite and increasing the viscosity, or the method of promoting hardening by adding water glass was proposed (refer patent document 3, patent document 4).

However, either method requires time until the viscosity rises, and the method of adding a super absorbent polymer is expensive. In addition, when the mixture is introduced into the injection material and kneaded from the beginning, the viscosity of the main material increases, so that the feeding distance cannot be shortened, and there is a problem that the injection location is limited.

On the other hand, in the method of adding water glass, since the pH of the water glass is 13 or more and it is a strong alkali, the operation is considerably limited, the problem that the elution water from hardened | cured material places a load on the environment, and the long-term strength of hardened | cured material falls. There was.

In addition, recently, as a method for solving the problem of the backfilling material, by adding a polymer as a plasticizer to the main material of cement-bentonite or cement-coal ash (fly ash), the plasticizer is instantaneously plasticized to improve the incompatibility and safety in the water. The improvement is proposed (refer patent document 3, patent document 5, and patent document 6).

On the other hand, the injection material using cement is used in order to acquire the reinforcement of a ground and an index effect (refer patent document 7). However, in the case of fine yarn, silt, or clay, lipids have a problem of small permeability to the ground and difficulty in injection.

Patent Document 1: Japanese Unexamined Patent Publication No. 2002-47037

Patent Document 2: Japanese Unexamined Patent Publication No. 2004-67477

Patent Document 3: Japanese Patent Application Laid-Open No. 10-237446

Patent Document 4: Japanese Patent Application Laid-Open No. 11-61123

Patent Document 5: Japanese Patent Application Laid-Open No. 10-238289

Patent Document 6: Japanese Unexamined Patent Publication No. 2000-280231

Patent Document 7: Japanese Unexamined Patent Publication No. 2004-149685

Disclosure of the Invention

Problems to be Solved by the Invention

The present invention is a ground improvement material that can be widely used in ground improvement work, water exploration work, etc., and particularly, blast furnace fume which has not been found to be effective in use, (1) a composition for ground improvement material excellent in permeability and durability, (2 ) Long-distance conveyability is superior to the injection material using bentonite or superabsorbent resin, and after the plasticizer is added, it thickens rapidly and, for example, the void filler such as backfilling material flows unnecessarily to a distant place, Even if there is water, the void filler flows out, is diluted, and the physical properties are not lowered, and, furthermore, it is made using the composition for the ground improving material which does not become strong alkali like water glass, and (3) the composition for the ground improving material, It is an object to provide an injection material having a high permeability to.

Means to solve the problem

MEANS TO SOLVE THE PROBLEM As a result of earnestly researching, the present inventors found out that the composition for novel ground improvement materials containing blast furnace fume can achieve the said subject favorably, and came to complete this invention. In addition, "part" and "%" in this specification are shown on a mass basis unless there is particular notice.

That is, this invention makes the following a summary.

(1) The composition for ground improvement materials containing blast furnace fume.

(2) The composition for ground improving materials according to the above (1), further comprising silica fume.

(3) The composition for ground improvement materials according to the above (1) or (2), which contains cement or calcium hydroxide having a maximum particle size of 40 µm.

(4) The composition for ground improving materials according to the above (1), which contains cement and an alkali thickening polymer emulsion.

(5) The composition for ground improvement materials as described in said (4) whose blast furnace fume is 30-500 parts with respect to 100 parts of cement.

(6) The composition for ground improving materials according to the above (4) or (5), wherein the alkali thickening polymer emulsion is a polymer emulsion obtained by copolymerization of unsaturated carboxylic acids with an ethylenically unsaturated compound.

(7) Furthermore, the composition for ground improving materials in any one of said (1)-(6) which contains a hardening accelerator.

(8) The composition for ground improvement materials in any one of said (1)-(7) in which a hardening accelerator contains an aluminate and / or a sulfate.

(9) The composition for ground improvement materials according to any one of (1) to (8), in which blast furnace fume has a maximum particle size of 30 µm.

(10) The composition for ground improvement materials according to any one of (1) to (9), wherein the blast furnace fume has 20 to 30% of SiO ₂ , 10 to 15% of Al ₂ O ₃ , and 15 to 25% of CaO.

(11) The injection material which consists of a composition for ground improvement materials in any one of said (1)-(10).

(12) The injection material according to the above (11), which contains calcium aluminate or calcium aluminosilicate, gypsum, and an alkali stimulant.

(13) The above-mentioned (11) or (12), comprising 1 to 15 parts of calcium aluminate or aluminosilicate silicate, 1 to 50 parts of gypsum, and 1 to 50 parts of an alkali stimulant with respect to 100 parts of blast furnace fumes. Injection material.

(14) The injection material according to any one of (11) to (13), wherein the maximum particle size is 20 µm or less.

(15) A liquid containing cement, blast furnace fume, and water, and a liquid B containing alkali thickening polymer emulsion and water are prepared in advance, and the liquid A and liquid B are mixed immediately before use. The use method of the composition for ground improvement materials in any one of said (4)-(10).

(16) A liquid containing cement, blast furnace fume, and water, and a liquid B containing a curing accelerator, an alkali thickening polymer emulsion and water were prepared in advance, and the liquid A and liquid B were prepared immediately before use. The method of using the composition for ground improvement materials of any one of said (4)-(10) to mix.

(17) A liquid comprising cement, blast furnace fume and water, a liquid B containing hardening accelerator and water, and a liquid C containing alkali thickening polymer emulsion and water are prepared and used in advance. The method of using the composition for ground improvement materials in any one of said (4)-(10) which mixes A liquid, B liquid, and C liquid immediately before.

Effects of the Invention

Since the composition for ground improvement materials containing blast furnace fume which concerns on this invention, and the injection material using the same are excellent in permeability and durability, they can be used extensively, such as ground improvement construction and waterworks construction, and also show a rapid viscosity rise, It has excellent strength developability, has incomparable properties in water, and has a characteristic that the pH value is lower than that of using water glass, so that the backfilling material in the cavity or the void portion of Jisan, the filler of the shield segment, and the double pipe It becomes a purity injection material in a single phase or double phase injection method.

Moreover, the composition for ground improvement materials and the injection material using the same by this invention are used for the application which needs to raise the viscosity of cement milk, cement mortar, or concrete rapidly, such as the sealing material and primary injection material by a double pipe double packer method. Valid. In addition, since it exhibits effects such as excellent permeability to the ground, high injectability, and excellent strength expression, it is possible to inject lipids into the ground, which has been difficult to apply in the past.

To practice the invention  Best form for

Blast furnace fumes used in the present invention are by-products generated in the steel industry, and are dusts that collect fumes generated from blast furnaces when pig iron is obtained. In the present invention, the blast furnace fume preferably has 20 to 30% of SiO ₂ , 10 to 15% of Al ₂ O ₃ , and 15 to 25% of CaO. As other components, Fe ₂ O ₃ is 1-5%, MgO is 3-9%, Na ₂ O is 0.5-2%, K ₂ O is 5-12%, SO ₃ is 5-12%, S Is 0.5% or less, and it is preferable that MnO has 0.1 to 0.5%. Moreover, as for blast furnace fume, it is preferable that a maximum particle diameter is 30 micrometers, and an average particle diameter is 3-5 micrometers. In addition, it is preferable that the blast furnace fume has a brain specific surface area value (hereinafter referred to as "brein") in the range of 15,00O to 25,0O 2 cm 2 / g. The blast furnace fume may be used as it is, or may be further pulverized and classified and finely powdered.

Although the cement used by this invention is not specifically limited, As a preferable specific example, various portland cements, such as a crude steel, a crude steel, a low heat, and a medium heat, for example, in these portland cements, blast furnace slug and fly ash Or various mixed cements mixed with silica, filler cement mixed with limestone powder or blast furnace slow cooling slug powder, waste type cement, so-called eco cement, and the like. One or two or more of these can be used in combination. In addition, cement concrete as used in this invention generically refers to cement milk, mortar, or concrete.

In the composition for ground improvement materials of this invention, it is preferable to contain silica fume as a component other than blast furnace fume from the point of improving the permeability to ground. Especially, use of acidic silica fume is preferable. It is also preferable to contain acidic silica fume and ordinary silica fume.

Here, acidic silica fume shows the acidity of 5 or less pH of the supernatant liquid when 1g of silica fumes are put into 100 cc of pure waters and stirred.

Although the powdery degree of silica fume is not specifically limited, Usually, about 2-200,000 m <2> / g is preferable in BET specific surface area.

Moreover, it is preferable that the composition for ground improvement materials of this invention uses fine powder of cement or calcium oxide together as components other than blast furnace fume in order to further improve durability. Durability can be evaluated by confirming the water which soaks from the hardened | cured body improved by the ground improvement material, what is called "dilution water."

The composition for ground improvement materials of the present invention is characterized by less generation of this liquid water and excellent durability compared to ground improvement materials mainly composed of water glass-based ground improvement materials and blast furnace slug fine powders which have been widely used in the past. have.

The cement or calcium hydroxide (hereinafter referred to as cements) is preferably cements having a maximum particle size of 40 µm and substantially not containing particles exceeding 40 µm. Specifically, it is cements whose content rate of particle | grains exceeding 40 micrometers is 1% or less, and it is more preferable that the maximum particle diameter is 30 micrometers. Moreover, 10 micrometers or less are preferable and, as for an average particle diameter, 5 micrometers or less are more preferable. When the maximum particle diameter of cements exceeds 40 micrometers, permeability may worsen. In addition, in this invention, an average particle diameter is measured by the laser diffraction type particle size distribution measuring apparatus.

Although said calcium hydroxide is not specifically limited, It can obtain by hydrating quicklime and can use a commercially available thing.

In addition, these cements may be finely powdered by a pulverization operation, and a fine powder part may be obtained by a classification operation.

Although the compounding ratio of each material in the said ground improvement material composition of this invention is not specifically limited, In a total of 100 parts of blast furnace fume and silica fume, 10-90 parts are preferable and 20-80 parts are more preferable. If the silica fume is less than 10 parts, the effect of improving the permeability may not be sufficiently expected. On the contrary, if the silica fume is more than 90 parts, the strength expression property may not be sufficient, or the liquid solution tends to be present.

Moreover, 1-100 parts are preferable and, as for cement, among 100 parts of total of blast furnace fume and cements, 3-30 parts are more preferable. If the blending ratio of cements is less than 1 part, the effect of improving the initial strength developability may not be expected, and if it exceeds 50 parts, the permeability tends to be poor.

When using the said ground improvement material composition of this invention, 50-500 parts are preferable and 100-300 parts are more preferable with respect to 100 parts of compositions for ground improvement materials. If it is less than 50 parts, permeability may not be enough, and if it exceeds 500 parts, securing of durability may become difficult.

In addition, when the composition for ground improvement materials of this invention contains blast furnace fume, cement, and an alkali thickening type polymer emulsion, since the usage-amount of blast furnace fume used changes with the quality of blast furnace fume, it cannot be prescribed | regulated uniquely. Although generally, 30-500 parts are preferable with respect to 100 parts of cement, and 50-300 parts are more preferable. If it is less than 30 parts, a viscosity may not increase, fluidity may become large, or the water inseparability may become small, and when it exceeds 500 parts, viscosity may become high too much and the kneading of the composition for ground improving materials may become difficult.

The alkali thickening polymer emulsion (hereinafter referred to as the present emulsion) used in the above-described ground improvement material composition of the present invention refers to a polymer emulsion which is thickened by alkali.

Examples of the emulsion include various kinds of unsaturated carboxylic acids, ethylenically unsaturated compounds, copolymers of unsaturated carboxylic acids and ethylenically unsaturated compounds, and the like. The polymer emulsion obtained by copolymerization of unsaturated carboxylic acids and an ethylenically unsaturated compound is preferable at the point which shows the more excellent effect.

As a polymerization method of an unsaturated carboxylic acid and an ethylenically unsaturated compound, the method of copolymerizing by methods, such as emulsion polymerization, suspension polymerization, solution polymerization, or block polymerization, etc. are mentioned.

Examples of the unsaturated carboxylic acids include unsaturated carboxylic acids such as acrylic acid, methacrylic acid, itaconic acid, maleic acid, fumaric acid, citraconic acid, aconitic acid and crotonic acid; Unsaturated carboxylic anhydrides such as maleic anhydride and citraconic anhydride; Unsaturated carboxylic acid esters such as monomethyl itaconate, monobutyl itaconate, and monoethyl maleate. Among these, unsaturated carboxylic acid is preferable at the point which is more excellent in thickening property, and acrylic acid and / or methacrylic acid are more preferable.

Although it does not specifically limit as said ethylenic unsaturated compound, A acrylic ester monomer and / or methacrylic acid ester monomer are preferable at the point which is more excellent in thickening property. As the acrylate ester, methyl acrylate, ethyl acrylate, butyl acrylate, hexyl acrylate, cyclohexyl acrylate, octyl acrylate, hydroxyethyl acrylate, 2-ethylhexyl acrylate, glycidyl acrylate, etc. Can be mentioned. As methacrylic acid ester, methyl methacrylate, ethyl methacrylate, butyl methacrylate, hydroxyethyl methacrylate, glycidyl methacrylate, etc. are mentioned.

As for the copolymerization ratio of the unsaturated carboxylic acid and ethylenically unsaturated compound of this emulsion to be more excellent in thickening property, unsaturated carboxylic acid: ethylenically unsaturated compound = 20: 1-1:20 are preferable, and 5: 1 -1: 5 is more preferable. Outside of this range, good alkali thickening may not be obtained.

0.1-2 parts is preferable in conversion of solid content with respect to 100 parts of cement, and, as for the usage-amount of this emulsion, 0.2-1 part is more preferable. If it is less than 0.1 part, a thickening effect may become small, fluidity may become large, and the water inseparability may become small, and when it exceeds 2 parts, initial stage intensity developability may become small.

The hardening accelerator can be used for the composition for ground improving materials of this invention further. When the hardening of the composition for the ground improving material is slow, bleeding (elution), which is a kind of material separation, occurs, and voids are formed after hardening, resulting in structural defects.

The hardening accelerator used by this invention promotes hardening of the composition for ground improving materials, reduces bleeding, suppresses generation | occurrence | production of a space, and contributes to strength expression.

As a hardening accelerator, sulfates, such as lithium sulfate, sodium sulfate, potassium sulfate, magnesium sulfate, calcium sulfate, aluminum sulfate, potassium alum, iron sulfate; Carbonates such as lithium carbonate, sodium carbonate and potassium carbonate; Hydroxides such as lithium hydroxide, sodium hydroxide, magnesium hydroxide, aluminum hydroxide, potassium hydroxide and calcium hydroxide; Chlorides such as calcium chloride, magnesium chloride and iron chloride; Aluminates such as lithium aluminate, sodium aluminate, potassium aluminate and calcium aluminate; Silicates such as lithium silicate, sodium silicate and potassium silicate; Amines such as diethanolamine and triethanolamine; Calcium salts of organic acids such as calcium formate and calcium acetate; And colloids such as silica sol and alumina sol. It is also possible to use these 1 type, or 2 or more types together. Among them, aluminate and / or sulfate are preferred from the viewpoint of excellent curing acceleration and strength expression, and more preferably aluminate and sulfate are used in combination.

Among the aluminates, calcium aluminate (hereinafter also referred to as CA) is preferable in view of curing acceleration and strength expression. CA generically refers to a compound containing CaO and Al ₂ O ₃ as a main component, and for example, a raw material containing calcia, a raw material containing alumina, and the like are mixed to be baked in a kiln or melted in an electric furnace. obtained by heat treatment, such as, collectively, to a compound composed mainly of CaO and Al ₂ O _3. Concrete examples _{are, CaO · 2Al 2 O 3,} CaO · Al 2 O 3, 12CaO · 7Al 2 O 3, 11CaO · 7Al 2 O 3 · CaF 2, 3CaO · Al 2 O 3, and 3CaO · 3Al ₂ O ₃ , crystalline calcium aluminate represented by the CaSO ₄ flow or the like, there may be mentioned amorphous compound composed mainly of CaO and Al ₂ O _3. Among them, it is in terms of strength property more preferably of 12CaO · 7Al ₂ O ₃ in the composition of amorphous.

The powdery degree of calcium aluminate is preferably 3,000 cm 2 / g or more, more preferably 5,000 cm 2 / g or more in a Breach. If it is less than 3,000 cm <2> / g, initial stage intensity developability may be small.

Among the sulfates, calcium sulfate and / or aluminum sulfate are preferable from the viewpoint of curing acceleration and strength expression. Examples of calcium sulfate include anhydrous gypsum, hemihydrate gypsum, and dihydrate gypsum. In this, anhydrous gypsum is preferable from the point of hardening acceleration and strength expression.

As for the powder degree of a sulfate, 3,000 cm <2> / g or more is preferable and, as for a brain specific surface area, 5,000 cm <2> / g or more is more preferable. If it is less than 3,000 cm <2> / g, intensity | strength developability may be small.

When aluminate and sulfate are used together as a hardening accelerator, 20-500 parts are preferable with respect to 100 parts of aluminate, and 50-150 parts are more preferable with respect to 100 parts of aluminate. If it is less than 20 parts, initial stage intensity | strength property may become small, and when it exceeds 500 parts, fluidity | liquidity will become large, the water non-separability becomes small, and long-term intensity developability may become small.

Although the usage-amount of a hardening accelerator differs according to the kind, it cannot be prescribed | regulated uniquely, but generally, 1-30 parts are preferable with respect to 100 parts of cement, and 2-20 parts are more preferable. If it is less than 1 part, fluidity | liquidity may become large, the water inseparability may become small, and intensity | strength developability may become small, and when it exceeds 30 parts, a viscosity may become high and a feeding distance may become short.

It is also possible to use together the aggregates, such as sand and gravel, a water reducing agent, and an antifreeze, to the composition for ground improvement materials containing the cement of this invention.

Although the quantity of the water mixed with cement in this invention is not specifically limited, 100-300 parts are preferable with respect to 100 parts of cement, and 150-200 parts are more preferable. If it is less than 100 parts, the kneading of the composition for ground improvement materials containing cement may become difficult, and when it exceeds 300 parts, fluidity may become large and the water inseparability may become small.

When the composition for ground improvement materials of this invention contains blast furnace fume, cement, and this emulsion, the usage method is not specifically limited, A liquid formed by mixing blast furnace fume, cement, and water, and this emulsion, The method of mixing B liquid which contains water just before use is a preferable method because a viscosity can be raised rapidly. In addition, mixing the present emulsion with water in advance to form a solution or a suspension is preferred in view of the good viscosity and thickness.

It is preferable to use this emulsion mixed with water. Although the usage-amount of water in that case is not specifically limited, It is preferable to dilute in 5-20 times of water of this emulsion solid content, and when using a hardening accelerator, it is preferable to dilute to 1-3 times. If the amount of water is less than this, the viscosity may increase and the mixing properties may deteriorate. If the amount of water increases, the dilution effect of the dilution water may increase, resulting in poor inseparability in the water.

The remaining water may be mixed with cement and blast furnace fume, and the liquid A of the cement-blast furnace fume and the B liquid of the present emulsion may be respectively pumped and used while joining and mixing at the tip of the nozzle. In particular, it is more preferable that the liquid A of the cement-blast furnace fume liquid, the liquid B of the emulsion liquid, which is doubled by mixing the bone emulsion and water, are doubled, respectively, and used while joining and mixing at the tip of the nozzle.

As the method of confluence mixing, a method of using a mixing tube such as a Y-shaped tube, a method of using a double tube, and an inlet in order to join and mix the B liquid of the emulsion liquid with the A liquid of the cement-blast furnace fume liquid in the shower phase. The method of using a piece, etc. are mentioned.

Moreover, in order to mix more uniformly, the method of setting a spiral mixer in a pipe | tube after joining mixing, and mixing further is also mentioned.

When the composition for ground improvement materials of this invention contains blast furnace fume, cement, this emulsion, and a hardening accelerator, the use method is not specifically limited similarly to the above, but is made by mixing blast furnace fume, cement, and water. A liquid comprising a liquid A, a liquid containing a curing accelerator and water (hereinafter referred to as a curing accelerator liquid), and a liquid containing a main emulsion and water (hereinafter referred to as a main emulsion liquid), The method of mixing just before use, or A liquid formed by mixing blast furnace fume, cement, and water, B liquid composed of a curing accelerator liquid, and C liquid composed of the present emulsion liquid, just before use, the viscosity It is a preferable method because it can raise rapidly.

Mixing this emulsion and a hardening accelerator with water beforehand to make a solution or a suspension becomes favorable in terms of mixing property, and is preferable in terms of thickening property. Although the usage-amount of water in that case is not specifically limited, In the case of this emulsion, it is preferable to dilute in 5-20 times of water of this emulsion solid content, and in the case of a hardening accelerator, to dilute in 1 to 3 times of water. It is preferable. If the amount of water is less than this, the viscosity may increase and the mixing properties may be reduced. If the amount of water is large, the fluidity may be increased and the water inseparability may be decreased.

In the present invention, the A liquid obtained by mixing blast furnace fume, cement, and water, and the B liquid formed by mixing the curing accelerator liquid and the present emulsion liquid may be respectively fed and combined and mixed at the nozzle tip. In particular, three types of liquids, such as A liquid formed by mixing blast furnace fume, cement, and water, B liquid composed of a curing accelerator liquid, and C liquid composed of the present emulsion liquid, are respectively pressurized and combined and mixed at the nozzle tip. It is more preferable.

In addition, since a hardening accelerator may harden within 1 hour after mixing with water, it is preferable to use a retarder together. Examples of the retardant include oxycarboxylic acids such as citric acid, tartaric acid, gluconic acid, and malic acid or their sodium salts and potassium salts, boric acid, tripolyphosphate, pyrophosphate, and the like. It is possible to use together. Among these, oxycarboxylic acid and / or oxycarboxylate are preferable, and citric acid and / or sodium citrate are more preferable at the point that a retardation effect is large.

0.01-10 parts is preferable with respect to 100 parts of cement, and, as for the usage-amount of a retardant, 0.05-5 parts are more preferable. If it is less than 0.01 part, the delay effect may be small, and when it exceeds 10 parts, intensity | strength developability may become small.

As said method of mixing and mixing, using the method of using mixing tubes, such as a Y magnetic pipe, the method of using a triple tube, and an inlet piece, B liquid of a hardening accelerator liquid and C liquid of this emulsion liquid are respectively showered. The method of joining and mixing to A liquid which mixes cement, blast furnace fume, and water is mentioned.

Moreover, in order to mix more uniformly, the method of setting a spiral mixer in the pipe | tube after joining mixing, and mixing further is also mentioned.

The blast furnace fume used for the injection material which uses the composition for the ground improvement material of this invention can also use the dust which collected the fume generated from the blast furnace as it is in the manufacturing process of steel, as it is, and is further used. It is also possible to grind and classify and use it finely powdered. In this invention, it is preferable to classify and use so that a maximum particle diameter may be 20 micrometers or less so that high permeability to a ground may be obtained.

In the injection material which uses the composition for ground improvement materials containing the blast furnace fume, calcium aluminate or aluminosilicate, gypsum, and an alkali irritant, the calcium aluminosilicate (henceforth CAS) used is , CaO, Al ₂ O ₃ , and SiO ₂ , and in combination with gypsum, mainly contribute to the development of short-term strength.

The composition of CAS is 20 to 60% of CaO content, 20 to 70% of Al ₂ O ₃ content, and SiO ₂

The content rate is preferably 5 to 30%, the CaO content 30 to 55%, the Al ₂ O ₃ content 30 to 60%, and

SiO ₂ content of 10 to 20% is more preferable. Outside this range, short-term strength may become small.

CAS is a rotary kiln after blending calcia raw materials such as limestone, alumina raw materials such as alumina, bauxite, feldspar, and clay, and silica raw materials such as silica, silica, quartz, and diatomaceous earth at a predetermined ratio. It is produced by baking in a lamp or melting in an electric furnace or a high frequency furnace.

Roneun _{CAS, 2CaO · Al 2 O 3} · SiO 2 or CaO · Al ₂ O ₃ · 2SiO also possible to use a crystalline compound of the _second and so on, but in short-term strength is greater surfaces, preferably of glass obtained by quenching a melt Do.

The vitrification rate of CAS is obtained by cooling the CAS at 1,000 ° C. for 2 hours, slow cooling at a cooling rate of 5 ° C./min, and determining the area (S ₀ ) of the main peak of the crystal mineral by powder X-ray diffraction. Is obtained as X (%) = 100 × (1-S / S ₀ ) from the main peak (S). In terms of short-term strength, 50% or more is preferable, 80% or more is more preferable, and 90% or more is more preferable. If it is less than 50%, short-term intensity | strength may be small.

As for the usage-amount of CAS, 1-50 parts are preferable with respect to 100 parts of blast furnace fumes, and 5-30 parts are more preferable. If it is less than 1 part, short-term strength is small, and when it exceeds 50 parts, the viscosity at the time of making an injection | pouring material into suspension may become large, and the permeability to the ground may fall.

In addition, the calcium aluminate used in the said injection | pouring material of this invention mainly contributes to strength expression by using together with gypsum. As a specific example, as CA contained in the composition for ground improving materials, all what was illustrated previously can be used. Among them, it is preferable to select an amorphous material having a CaO / Al ₂ O ₃ molar ratio of 1 to 2 in terms of curing time and strength expressability of the injection material.

Glass ratio of CA is completely the same as that of the above-described CAS, obtained as X (%) = 100 × ( 1-S / S 0). However, S and S ₀ are calculated | required similarly to the case of CAS. In terms of short-term strength, 50% or more is preferable, 80% or more is more preferable, and 90% or more is more preferable. If it is less than 50%, short-term intensity | strength may be small.

CA is obtained in the raw materials such as CaO and Al ₂ O ₃ raw material, for example, by heat treatment by an electric furnace or a rotary kiln. Raw material for the preparation of the CA is not particularly limited, for example, is a CaO material as is, there may be mentioned calcium carbonate, calcium hydroxide, and calcium oxide such as limestone or oyster shell, Al ₂ O ₃ raw material, e. For example, in addition to the industrial by-products called bauxite and alumina ash, an aluminium powder etc. are mentioned.

1-50 parts is preferable with respect to 100 parts of blast furnace fumes, and, as for the usage-amount of CA, 5-30 parts are more preferable. If it is less than 1 part, short-term strength is small, and when it exceeds 50 parts, the viscosity at the time of making an injection | pouring material into suspension may become large, and the permeability to the ground may fall.

Moreover, the gypsum used in the said injection | pouring material of this invention can mention anhydrous gypsum, hemihydrate gypsum, and dihydrate gypsum. Furthermore, natural gypsum, chemical gypsum such as phosphate byproduct gypsum, upset gypsum, and hydrofluoric acid byproduct gypsum, or gypsum obtained by heat-treating them can be used. Among these, anhydrous gypsum is preferable from the viewpoint of high strength expression.

1-50 parts is preferable with respect to 100 parts of blast furnace fumes, and, as for the usage-amount of gypsum, 5-30 parts are more preferable. If it is less than 1 part, short-term intensity | strength is small, and if it exceeds 50 parts, permeability to a ground may fall.

Furthermore, the alkali stimulant used in the said injection | pouring material of this invention contributes to hardening and increase of long-term strength by combined use with blast furnace fume.

Examples of the alkali stimulant include alkali metal hydroxides such as sodium hydroxide, potassium hydroxide and lithium hydroxide, alkali metal carbonates such as sodium carbonate, potassium carbonate and lithium carbonate, and slaked lime. Although it does not specifically limit, Among these, calcined lime is preferable at the point of hardening by combined use with blast furnace fume, and an increase of long-term strength. As for the usage-amount of an alkali-stimulating material, 1-50 parts are preferable with respect to 100 parts of blast furnace fumes, and 3-20 parts are more preferable. If it is less than 1 part, long-term strength is small, and when it exceeds 50 parts, permeability to a ground may fall.

20 micrometers is preferable, as for the largest particle diameter of the injection | pouring material in this invention, 15 micrometers is more preferable, and its 10 micrometers or less are the most preferable. When it exceeds 20 micrometers, injection into a fine gap may become difficult depending on the lipid of the soil.

The preparation method of the particle size of the injection material is not particularly limited, but each material is pulverized by a pulverizer such as a ball mill, and the like is collected by a classification, 20 μm or less are collected, then mixed or pulverized after mixing the respective materials. By the way, all the methods which collect | collect 20 micrometers or less can be used. However, if each material is mixed and then pulverized and classified, the mixing ratio may change due to the density difference of each material. Therefore, it is preferable to pulverize, classify, and mix each material separately.

In addition, in this invention, in order to adjust so that a required hardening time may be obtained, it is preferable to use a coagulation regulator together.

Examples of the coagulation regulator include aluminates such as sodium aluminate and potassium aluminate, carbonates such as sodium carbonate and potassium carbonate, hydroxides such as sodium hydroxide and potassium hydroxide, sulfates such as aluminum sulfate, iron (III) sulfate, and alum, Inorganic salts such as silicates such as sodium silicate and potassium silicate, phosphates such as sodium phosphate, calcium phosphate, and magnesium phosphate, and borate salts such as lithium borate and sodium borate, citric acid, gluconic acid, tartaric acid, and malic acid or sodium thereof Organic acids such as salts, potassium salts and calcium salts or metal salts thereof, and sugars. It is possible to use together one or two or more of these. In this, in order to ensure the required hardening time, it is preferable to use carbonate and organic acids together.

Although the usage-amount of a coagulation regulator is not specifically limited in order to adjust according to hardening time, 0.1-10 parts are preferable with respect to a total of 100 parts of CAS or CA and gypsum, and 0.5-5 parts are more preferable. If it is less than 0.1 part, it may be difficult to ensure hardening time, and when it exceeds 10 parts, hardening time may become long and strength may become small.

In order to improve the permeability to the ground, it is preferable to use a dispersing agent further in this invention.

Examples of the dispersant include naphthalene sulfonic acid formalin condensate salt system, lignin sulfonic acid salt, melamine sulfonic acid formalin condensate salt system, polycarboxylate salt, and polyether dispersant.

0.1-10 parts is preferable with respect to 100 parts of blast furnace fumes, and, as for the usage-amount of a dispersing agent, 0.5-3 parts are more preferable. If it is less than 0.1 part, permeability may be small, and when it exceeds 10 parts, strength may become small.

The amount of water in the case of using the injection material as a suspension is not particularly limited as long as the suspension can be pumped by a pump. However, 100 to 1,000 parts are preferable with respect to a total of 100 parts of blast furnace, CAS or CA, gypsum, and an alkali stimulant, and 200 500 parts is more preferable. If it is less than 100 parts, the viscosity of a suspension may become high and permeability may be small, and when it exceeds 1,000 parts, strength may become small.

The kneading method and the injection method of the injection material are not particularly limited, and can be applied to currently used methods such as a single pipe rod method, a single pipe strainer method, a double pipe single phase method, a double pipe double phase method, and a double pipe double packer method.

EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is limited to them and is not interpreted.

Example 1-1

The blast furnace fume and silica fume shown in Table 1-1 were mix | blended, the composition for ground improving materials was prepared, 150 parts of water were added and stirred with respect to 100 parts of the ground improving materials composition prepared, the ground improving material was prepared, and the ground improvement was improved. The permeability of the ash and the durability of the improved body after curing were confirmed.

In addition, the same experiment was performed also when the blast furnace slug fine powder and the water glass type | system | group glass improvement material were used instead of the composition for ground improvement materials of this invention for comparison. The results are written together in Table 1-1.

<Material used>

Blast furnace fumes: Made in China, commercially available, SiO ₂ 25%, Fe ₂ O ₃ 3%, Al ₂ O ₃ 13%, CaO 19%, MgO 6%, Na ₂ O 1.3%, K ₂ O 9%, SO ₃ 10% , S 0.3%, and MnO 0.2%, Breinch 21,000 cm 2 / g, maximum particle diameter is 30 μm, average particle diameter is 4 μm

Silica fume: Commercial item, Acidic silica fume, Average particle diameter 0.1 micrometer, Breach 150,000cm <2> / g

Blast furnace slug fine powder: Fine powder of commercially available blast furnace slug slug, maximum particle diameter 5㎛, average particle diameter 5㎛

Water glass-based ground improvement material: Commercial item, main component is water glass, minor component is sodium carbonate

Water: Tap Water

<Measurement method>

Permeability: After filling a No. 8 silica sand to a height of 20 cm in a vinyl tube of 5 cm in diameter x 30 cm in height, a hole of about 0.5 mm is drilled in the bottom of the vinyl tube, and 250 cc of ground modifier is introduced from the upper surface. Measure penetration depth after days

Durability: The hardened | cured material obtained by the permeability test was observed until the age of 91 days, and this liquid water was measured and evaluated. This liquid water measured the weight of the water which flowed out from the hole drilled in the bottom face of the vinyl tube, and was represented by volume% with respect to 250 cc of ground improving materials.

Table 1-1

Example 1-2

It carried out similarly to Experimental Example 1-1 except having used the blast furnace fume, silica fume, and cement shown in Table 1-2. The results are written together in Table 1-2.

<Material used>

Cement A: finely divided cement of commercial product, maximum particle size 40㎛, average particle diameter 5㎛

Cement B: Commercially available calcium hydroxide, maximum particle size 40 μm, average particle size 5 μm

Table 1-2

Experimental Example 2-1

With respect to 100 parts of cement, blast furnace fume and water in the amounts shown in Table 2-1 were kneaded with a mixer to prepare an A liquid. Next, 0.5 part of emulsion (alpha) and 5 parts of water were mixed with respect to 100 parts of cement in solid content, and B liquid was prepared.

B liquid was poured into A liquid, it kneaded for 5 second, the kneaded material was prepared, and the flow, the water non-separability, and the compressive strength were measured.

In addition, for comparison, the same experiment was conducted using bentonite instead of blast furnace fume. The results are written together in Table 2-1.

<Material used>

Cement: Common Portland Cement, Commercial

Emulsion (alpha): This emulsion, 30% of solid content concentration, ethyl acrylate: methacrylic acid = 45:55 ethyl acrylate / methacrylic acid copolymer polymer emulsion

Blast furnace fume: Made in China, commercially available. SiO ₂ 25%, Fe ₂ O ₃ 3%, Al ₂ O ₃ 13%, CaO 19%, MgO 6%, Na ₂ O 1.3%, K ₂ O 9%, SO ₃ 10%, S 0.3%, and MnO 0.2%, Brech 21,000cm2 / g, Maximum particle size is 30㎛, Average particle size is 4㎛

Bentonite: Commercial item

<Measurement method>

Flow: The kneaded material was put into a cylinder having an inner diameter of 80 mm x a height of 80 mm, and the diffusion after drawing the cylinder was measured after 2 minutes.

Underwater inseparability: Conducted in accordance with the underwater separation test in the appendix of the Design Guidelines for Underwater Uncontaminated Concrete Design by the Civil Engineering Society, when there is no water turbidity, and when there is a slight turbidity of water. (A) and the material were separated and the case where the turbidity of water was large was made impossible.

Compressive strength: measured according to JIS R 5201

Table 2-1

100 parts of cement, 200 parts of blast furnace fume, and 180 parts of water were kneaded with a mixer to prepare liquid A. The emulsion shown in Table 2-2 and water 10 times the amount of emulsion were mixed with 100 parts of cement, and the liquid B was prepared. It carried out similarly to Experimental Example 2-1 except having prepared the following.

In addition, for comparison, the same experiment was conducted using a non-bone emulsion having no alkali thickening instead of the present emulsion. The results are written together in Table 2-2.

<Material used>

Emulsion (beta): This emulsion, 30% of solid content concentration, 70 parts of ethylene / vinyl acetate copolymer emulsions of ethyl acrylate: methacrylic acid = 45:55, and the ethyl acrylate / acrylic copolymer copolymer of ethylene: vinyl acetate = 18:82 Mixture of 30 parts of emulsion

Emulsion (gamma): This emulsion, 30% of solid content concentration, The styrene / 2-ethylhexyl acrylate = 45:55 styrene / 2-ethylhexyl acrylate copolymer polymer emulsion

Table 2-2

Experimental Example 3-1

With respect to 100 parts of cement, blast furnace fume and water in the amounts shown in Table 3-1 were kneaded with a mixer to prepare an A liquid. Next, 5 parts of hardening accelerators a and 10 parts of water were mixed with 100 parts of cement to prepare liquid B, 0.5 parts of present emulsion α and 5 parts of water were mixed in terms of solid content to prepare a C liquid.

Liquid A, liquid B, and liquid C were continuously added to the mixer and kneaded for 5 seconds to prepare an injection material, and then flow, water inseparability, and compressive strength were measured. In addition, it carried out similarly using bentonite instead of blast furnace fume for comparison. The results are written together in Table 3-1.

<Material used>

Cement: Common Portland Cement, Commercial

Blast furnace fumes: Made in China, commercially available, SiO ₂ 25%, Fe ₂ O ₃ 3%, Al ₂ O ₃ 13%, CaO 19%, MgO 6%, Na ₂ O 1.3%, K ₂ O 9%, SO ₃ 10% , S 0.3%, and MnO 0.2%, Breinch 21,000 cm 2 / g, maximum particle diameter is 30 μm, average particle diameter is 4 μm

Emulsion (alpha): This emulsion, 30% of solid content concentration, ethyl acrylate: methacrylic acid = 45:55 ethyl acrylate / methacrylic acid copolymer polymer emulsion

Curing accelerator a: Equivalent mixture of calcium aluminate having a composition of 12CaO.7Al ₂ O ₃ , 95% vitrification rate, aluminate of breinch 6,000 cm 2 / g, and sulfate of anhydrous gypsum and 5,400 cm 2 / g of brene.

Bentonite: Commercial item

<Measurement method>

Flow: The mixture after kneading was put into a cylinder having an inner diameter of 80 mm x a height of 80 mm, and the diffusion after drawing the cylinder was measured after 2 minutes.

Underwater inseparability: Conducted in accordance with the underwater separation test in the appendix to the Design Guidelines for Underwater Uncontaminated Concrete in the Civil Engineering Society, when there is no water turbidity. In this case, the material was separated and the case where the turbidity of water was large was made impossible.

Compressive strength: measured according to JIS R 5201

Table 3-1

Example 3-2

100 parts of cement, 200 parts of blast furnace fume and 180 parts of water were kneaded with a mixer to prepare liquid A. To 100 parts of cement, 5 parts of a curing accelerator a and 10 parts of water were mixed to prepare a liquid B. Table 3-2 It carried out similarly to Experimental Example 3-1 except having prepared C liquid by mixing the emulsion shown by and 10 times of water of the emulsion.

In addition, it carried out similarly using the non-bone emulsion which does not have alkali thickening property instead of this emulsion for comparison. The results are written together in Table 3-2.

<Material used>

Emulsion (beta): This emulsion, 30% of solid content concentration, 70 parts of ethyl acrylate / methacrylic acid copolymer polymer emulsion of ethyl acrylate: methacrylic acid = 45:55, and ethylene / vinyl acetate of ethylene: vinyl acetate = 18:82 Mixture of 30 parts of copolymerized polymer emulsion

Emulsion (gamma): This emulsion, 30% of solid content concentration, The styrene / 2-ethylhexyl acrylate = 45:55 styrene / 2-ethylhexyl acrylate copolymer polymer emulsion

Table 3-2

Example 3-3

100 parts of cement, 200 parts of blast furnace fume, and 180 parts of water were kneaded with a mixer to prepare a liquid A, and 0.5 parts of this emulsion α and 5 parts of water were mixed in a solid content conversion to 100 parts of cement to prepare a C liquid. It carried out similarly to Experimental Example 3-1 except having prepared B liquid by mixing the hardening accelerator shown in Table 3-3, twice the amount of water, and 0.1 part of retarders with respect to 100 parts of cement. The results are written together in Table 3-3.

<Material used>

Curing accelerator b: sulfate, aluminum sulfate, commercial item

Cure accelerator c: carbonate, sodium carbonate, commercial item

Curing accelerator d: hydroxide, calcium hydroxide, commercial item

Hardening accelerator e: Aluminate, Sodium aluminate, Commercial item

Curing accelerator f: colloid, silica sol, commercial item

Retardants: Citric Acid, Commercial Items

Table 3-3

Example 4-1

With respect to 100 parts of blast furnace fumes, the CAS, gypsum, and alkali stimulant shown in Table 4-1 were mixed to prepare an injection material having a maximum particle size of 30 μm. A suspension was prepared by mixing 100 parts of prepared injection material and 300 parts of water. At this time, 1 part of a dispersing agent was mixed with respect to 100 parts of blast furnace fumes, 1 part of condensation regulators were mixed with respect to 100 parts of CAS and gypsum, and the hardening time, penetration length, and compressive strength of the injection material were measured. The results are written together in Table 4-1.

<Material used>

Blast furnace fume: Made in China, commercially available. SiO ₂ 25%, Fe ₂ O ₃ 3%, Al ₂ O ₃ 13%, CaO 19%, MgO 6%, Na ₂ O 1.3%, K ₂ O 9%, SO ₃ 10%, S 0.3%, and MnO 0.2%, Brech 21,000cm2 / g, Maximum particle size is 30㎛, Average particle size is 4㎛

CAS value: CaO 45%, Al ₂ O ₃ 40%, and SiO ₂ 15% composition, 95% vitrification

CAS Na: glass of CaO 45%, Al ₂ O ₃ 28%, and SiO ₂ 27% composition, vitrification rate 95%

Gypsum: Natural Anhydrous Gypsum

Alkali stimulant: slaked lime, commercial item

Dispersant: Naphthalene sulfonic acid formalin condensate salt system

Coagulation regulator: Mixture of 1: 3 weight ratio of citric acid and potassium carbonate

<Test method>

Penetration length: A 5 cm diameter x 30 cm length vinyl tube was filled with No. 8 silica sand to a length of 20 cm, 200 ml of injection material was added, and after 1 day, the penetration length into the sand was measured.

Cure time: time until the suspension does not flow even if the cup with the suspension is tilted

Compressive strength: measured in accordance with JIS R 5201, measuring days 1 and 28 days

Table 4-1

Example 4-2

10 parts of CAS value, 10 parts of gypsum, and 5 parts of alkali stimulants were mixed with respect to 100 parts of blast furnace fumes, an injection material having a maximum particle size shown in Table 4-2 was prepared, and the curing time was the same as in Experimental Example 4-1. , Penetration length, and compressive strength were measured. The results are written together in Table 4-2.

Table 4-2

Example 5-1

With respect to 100 parts of blast furnace fumes, CA, gypsum, and alkali stimulant shown in Table 5-1 were mixed to prepare an injection material having a maximum particle size of 30 μm. A suspension was prepared by mixing 100 parts of prepared injection material and 300 parts of water. At this time, 1 part of a dispersing agent was mixed with respect to 100 parts of blast furnace fumes, 1 part of condensation regulators were mixed with respect to 100 parts of CA and gypsum, and the hardening time, penetration length, and compressive strength of the injection material were measured. The results are written together in Table 5-1.

<Material used>

Blast furnace fumes: Made in China, commercially available, SiO ₂ 25%, Fe ₂ O ₃ 3%, Al ₂ O ₃ 13%, CaO 19%, MgO 6%, Na ₂ O 1.3%, K ₂ O 9%, SO ₃ 10% , S 0.3%, and MnO 0.2%, Breinch 21,000 cm 2 / g, maximum particle diameter is 30 μm, average particle diameter is 4 μm

CA is: amorphous 12CaO · 7Al ₂ O _3, the glass rate to 95%

CA Na: Crystalline CaO · Al ₂ O ₃ , Vitrification rate 20%

Gypsum: Natural Anhydrous Gypsum

Alkali stimulant: slaked lime, commercial item

Dispersant: Naphthalene sulfonic acid formalin condensate salt system

Coagulation regulator: Mixture of 1: 3 weight ratio of citric acid and potassium carbonate

<Test method>

Penetration length: A 5 cm diameter x 30 cm length vinyl tube was filled with No. 8 silica sand to a length of 20 cm, 200 ml of injection material was added, and after 1 day, the penetration length into the sand was measured.

Cure time: time until the suspension does not flow even if the cup with the suspension is tilted

Compressive strength: measured in accordance with JIS R 5201, measuring days 1 and 28 days

Table 5-1

Example 5-2

10 parts of CA, 10 parts of gypsum, and 5 parts of alkali stimulants were mixed with respect to 100 parts of blast furnace fumes, an injection material having a maximum particle size shown in Table 5-2 was prepared, and the curing time was performed in the same manner as in Experimental Example 5-1. , Penetration length, and compressive strength were measured. The results are written together in Table 5-2.

Table 5-2

Since the composition for the ground improvement material of this invention has favorable permeability and is excellent also in durability, it can be utilized extensively, such as void fillers, such as a backfilling material, in ground improvement construction and waterworks construction, and also of this invention, Since the injection material using the composition for improving ground material is excellent in permeability to the ground, high injectability, and excellent in strength expression, the injection material can be injected into the ground, which has been difficult to apply in the past, and is an industrial by-product. Therefore, effective use of the fume can be aimed at.

In addition, Japanese Patent Application 2004-327140 filed November 11, 2004, Japanese Patent Application 2004-369240 filed December 21, 2004, Japanese Patent Application 2005- filed January 31, 2005 022895, Japanese Patent Application No. 2005-022896, filed Jan. 31, 2005, and Japanese Patent Application No. 2005-032719, filed Feb. 9, 2005, are hereby incorporated by reference in their entirety. It is cited here, and introduces as a description of this specification.

Claims (17)

A composition for ground improvement materials comprising blast furnace fume. The method of claim 1, Furthermore, the composition for ground improvement materials containing silica fume. The method according to claim 1 or 2, A composition for ground improvement materials containing cement or calcium hydroxide having a maximum particle diameter of 40 µm. The method according to claim 1 or 2, A ground improvement material composition comprising cement and an alkali thickening polymer emulsion. The method according to claim 3 or 4, The composition for ground improvement materials whose blast furnace fume is 30-500 mass parts with respect to 100 mass parts of cement. The method according to claim 4 or 5, The alkali thickening polymer emulsion is a polymer emulsion composition obtained by copolymerization of unsaturated carboxylic acids with an ethylenically unsaturated compound. The method according to any one of claims 1 to 6, Furthermore, the composition for ground improvement materials containing a hardening accelerator. The method of claim 7, wherein The composition for ground improvement materials in which a hardening accelerator contains aluminate and / or a sulfate. The method according to any one of claims 1 to 8, Blast-furnace composition for ground improvement material which has a maximum particle diameter of 30 micrometers. The method according to any one of claims 1 to 9, The blast furnace fume has 20-30% of SiO ₂ , 10-15% of Al ₂ O ₃ , and 15-25% of CaO. An injection material using the composition for the ground improvement material according to any one of claims 1 to 10. The method of claim 11, An injection material containing calcium aluminate or calcium aluminosilicate, gypsum, and an alkali stimulant. The method according to claim 11 or 12, An injection material comprising 1 to 15 parts by mass of calcium aluminate or aluminosilicate silicate, 1 to 50 parts by mass of gypsum, and 1 to 50 parts by mass of an alkali stimulant based on 100 parts by mass of blast furnace fume. The method according to any one of claims 11 to 13, Injection material with a maximum particle diameter of 20 μm or less. The liquid A containing cement, blast furnace fume, and water, and the liquid B containing alkali thickening type polymer emulsion and water are respectively prepared in advance, and A liquid and B liquid are mixed just before use. The method of using the composition for ground improvement materials in any one of Claims 10-10. A liquid containing cement, blast furnace fume and water, and a liquid B containing a curing accelerator, an alkali thickening polymer emulsion and water are prepared in advance, and the liquid A and the liquid B are mixed immediately before use. The use method of the composition for ground improvement materials in any one of Claims 4-10. A liquid containing cement, blast furnace fume and water, a liquid B containing hardening accelerator and water, and a liquid C containing alkali thickening polymer emulsion and water are prepared in advance and immediately before use. The method of using the composition for the ground improvement materials in any one of Claims 4-10 which mixes A liquid, B liquid, and C liquid to the said liquid.