WO2006051875A1

WO2006051875A1 - Composition for ground-improving material, grouting material comprising the same, and method of using the same

Info

Publication number: WO2006051875A1
Application number: PCT/JP2005/020641
Authority: WO
Inventors: Kenji Yamamoto; Katsuaki Iriuchijima; Minoru Morioka; Mitsuo Takahashi
Original assignee: Denki Kagaku Kogyo Kabushiki Kaisha
Priority date: 2004-11-11
Filing date: 2005-11-10
Publication date: 2006-05-18
Also published as: JP4902356B2; TWI313673B; KR100869467B1; TW200640821A; KR20070083874A; CN101052697B; CN101052697A; JPWO2006051875A1

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

Specification

Ground improvement material composition, injection material using the same, and method of using the same

[0001] The present invention relates to an effective utilization method of a blast furnace fume, a composition for ground improvement material widely used in ground improvement work and water stoppage work in the civil engineering and construction industry, a method for preparing them, and a method for using them. Concerning the injection material.

Background art

[0002] In recent years, environmental problems have been greatly highlighted, and in particular, various attempts have been made for effective use of industrial by-products. Among them, blast furnace granulated slag, fly ash, silica fume, etc. have already been used in many effective ways.For example, they are mixed in Portland cement and used in JIS. Speak.

However, there are many industrial by-products for which effective usage has not yet been established, and the establishment of such usage is strongly required to build a recycling-oriented society. One of them is blast furnace fume.

[0003] Blast furnace fume is a by-product generated in the manufacturing process of steel, and is dust that collects fumes that also generate blast furnace power when pig iron is obtained. As an effective utilization method of blast furnace fume, it has been proposed as an admixture used for a glass fiber reinforced cement composite (see Patent Document 1 and Patent Document 2). However, alkali metals are contained in the components of the blast furnace fume. At present, there is concern about the reaction of alkali-aggregate reaction.

[0004] On the other hand, ground improvement materials are widely used for ground improvement work, water stoppage work, and the like.

Ground improvement works include soft ground, foundations for large special structures such as dams and power plants, curtain grouts for ground reinforcement, and injection of chemicals when applying underground structures such as tunnels, oil and LPG storage bases, etc. It is ground improvement work. Water stoppage is a place lower than the groundwater level

Construction of injecting ground improvement material in order to prevent the spring water generated during the excavation work of underground structures under the seabed and under the aquifer ground by injecting the injection material, and to improve the water tightness of the ground It is. In addition to these, the ground in poor drainage and liquid soil There are ground collapse prevention work in the improvement of the grounds of general houses and condominiums and infrastructure development such as water supply and sewerage.

The ground improvement material is widely used in these constructions, and is a material used for the purpose of strengthening the ground by consolidation or dehydration of the ground.

[0005] Next, the above ground improvement material and construction using the same will be described with specific examples.

For example, in the tunnel covering, there may be a cavity in the back of the covering concrete during and after construction. If this cavity is left as it is, the ground surface will sink as the ground collapses into the cavity. When the ground collapses severely, the cover concrete is deformed or destroyed, in particular, the tunnel collapses, the cover concrete is degraded due to the inflow of groundwater into the cavities, and the resulting lanes of the deteriorated concrete fragments There were problems such as falling to the road and freezing of the lane in winter due to water leakage from the crack.

[0006] In recent years, as the number of construction works has increased, there is a backfilling method for filling tunnels to fill the cavities on the back of the concrete and to improve the stability of the tunnel. The injection material used here is called a backfill material, and cement bentonite has been generally used. However, there is a problem that the fluidity is too large and the backfilling material unnecessarily flows far away, and if there is spring water, the backfilling material flows out or is diluted and the physical properties deteriorate.

[0007] Therefore, a method has been proposed in which a superabsorbent resin is added to the main material of cement and bentonite to increase the viscosity, and a method of adding water glass to accelerate hardening (Patent Document 3). , See Patent Document 4).

[0008] However, each method requires time until the viscosity increases, and the method of adding a highly water-absorbent resin is expensive. In addition, when the mixture is first introduced into the injection material and kneaded, the viscosity of the main material increases, so the pumping distance has to be shortened, and the injection point is limited.

On the other hand, in the method of adding water glass, since the pH of the water glass is a strong alkali having a pH of 13 or more, the work is considerably limited, and the elution water from the cured body gives an environmental load, and the cured body There was a problem such as a decrease in long-term strength. [0010] Further, recently, as a method for solving the problems of backfill materials, plastics are instantly added by adding a polymer as a plasticizer to the main material of cement bentonite or cement-coal ash (fly ash). And improved water inseparability and safety have been proposed

(See Patent Document 3, Patent Document 5, and Patent Document 6.)

[0011] On the other hand, in order to obtain ground reinforcement and a water stop effect, an injection material using cement is used (see Patent Document 7). However, when the geology is fine sand, silt, or clay, there are problems such as permeability to the ground and difficulty in pouring.

Patent Document 1: Japanese Patent Application Laid-Open No. 2002-47037

Patent Document 2: Japanese Patent Laid-Open No. 2004-67477

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

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

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

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

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

Disclosure of the invention

Problems to be solved by the invention

[0013] The present invention is a ground improvement material that can be widely used in ground improvement work, water stoppage work, etc., and uses a blast furnace fume for which no effective utilization method has been found. The composition for ground improvement material with excellent durability, (2) Long-distance pumpability is superior to the injection material using bentonite and high water-absorbent resin, and the viscosity increases rapidly after the plasticizer is added. The gap filler such as backfilling material unnecessarily flows away to the distance, the gap filler does not flow out even if there is spring water, and it does not dilute and deteriorate the physical properties. An object of the present invention is to provide a composition for a ground improvement material in which the dissolved water does not become a strong alkali, and (3) an injection material having a high permeability to the ground, which uses the composition for the ground improvement material. .

Means for solving the problem

[0014] As a result of extensive research, the present inventors have found that a novel ground improvement material composition containing a blast furnace fume can achieve the above-mentioned problems satisfactorily, and has completed the present invention. I got it. Note that “parts” and “%” in this specification are based on mass unless otherwise specified. That is, the gist of the present invention is as follows.

(1) A composition for ground improvement material comprising blast furnace fume.

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

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

(4) The ground improvement material composition as described in (1) above, comprising cement and an alkali thickening polymer emulsion.

(5) The ground improvement material composition as described in (4) above, which is 30 to 500 parts per 100 parts of blast furnace fume cement.

(6) Alkali-thickening polymer emulsion power A ground improvement material as described in (4) or (5) above, which is a polymer emulsion obtained by copolymerization of an unsaturated carboxylic acid and an ethylenically unsaturated compound. Composition.

(7) The ground improvement material composition according to any one of (1) to (6), further comprising a curing accelerator.

(8) The composition for ground improvement material according to any one of (1) to (7) above, wherein the curing accelerator contains aluminate and Z or sulfate.

(9) Blast furnace fume force The composition for ground improvement material as set forth in any one of (1) to (8) above, having a maximum particle size of 30 μm

(10) Blast Furnace Fumuka SiO force 0-30%, Al O force 10-15%, and CaO 15-25

2 2 3

The composition for ground improvement material according to any one of the above (1) to (9), having a%.

(11) The injection material comprising the composition for ground improvement material according to any one of (1) to (10) above

(12) The injection material according to (11) above, comprising calcium aluminate or calcium aluminokeate, gypsum, and an alkali stimulant

(13) The above-mentioned (11) containing 1 to 15 parts of calcium aluminate or calcium aluminosilicate, 1 to 50 parts of gypsum, and 1 to 50 parts of an alkali stimulant for 100 parts of blast furnace fume (11 ) Or the injection material according to (12).

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

(15) Prepare liquid A containing cement, blast furnace fume, and water, and liquid B containing alkali-thickened polymer emulsion and water, and prepare liquid A and liquid B immediately before use. The method of using the composition for ground improvement material according to any one of the above (4) to (10), which is mixed.

(16) Liquid A containing cement, blast furnace fume, and water, and liquid B containing a curing accelerator, an alkali-thickening polymer emulsion and water, were prepared in advance and reused. The method for using the ground improvement material composition according to any one of (4) to (10) above, wherein the liquid A and the liquid B are mixed before.

(17) Liquid A containing cement, blast furnace fume, and water, Liquid B containing a curing accelerator and water, and C containing an alkali-thickening polymer emulsion and water A method for using the composition for ground improvement material according to any one of (4) to (10) above, wherein the solutions are prepared in advance, and the solutions A, B and C are mixed immediately before use.

The invention's effect

The composition for ground improvement material containing blast furnace fume and the injection material using the same according to the present invention are excellent in permeability and durability, and can be widely used for ground improvement work and water stop work. In addition, it has a rapid viscosity increase, excellent strength development, inseparability in water, and has a low pH value compared to when water glass is used. It serves as a backfill material for cavities and voids in natural ground, a filler for shield segments, and a quick setting injection material for double-pipe single-phase or double-phase injection methods.

Furthermore, the composition for ground improvement material and the injection material using the same according to the present invention rapidly increase the viscosity of cement milk, cement mortar, or concrete, such as a sealing material or primary injection material in a double-pipe double packer method. It is effective for applications that need to be raised. In addition, since it has excellent permeability to the ground, high injectability and excellent strength development, it is possible to inject into geological ground that was difficult to apply in the past.

BEST MODE FOR CARRYING OUT THE INVENTION [0016] The blast furnace fume used in the present invention is a by-product generated in the steel industry, and is dust collected from fumes that also generate blast furnace power when pig iron is obtained. In the present invention, the blast furnace fume contains, as components, SiO force 0-30%, AlO force 10-15%, and CaO 15-25%.

2 2 3

It is preferable to have. Other ingredients include Fe O force ^ ~ 5%, MgO 3 ~ 9%, N

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a O 0.5-2%, K O 5-12%, SO power -12%, S 0.5% or less, and MnO

2 2 3

Preferably 0.1 to 0.5%. The blast furnace fume preferably has a maximum particle size of 30 m and an average particle size of 3 to 5 μm. The fineness of the blast furnace fume preferably has a brain specific surface area value (hereinafter referred to as a brain value) in the range of 15,000 to 25,000 cm ² / g. The blast furnace fume may be used as it is, or may be further pulverized and classified to be used as a fine powder.

[0017] The cement used in the present invention is not particularly limited, but preferred specific examples include various portland cements such as normal, early strength, super early strength, low heat, and moderate heat, and these portland cements. In addition, various mixed cements mixed with blast furnace slag, fly ash, or silica, filler cement mixed with limestone powder or blast furnace slow-cooled slag fine powder, waste-use cement, so-called eco cement, and the like can be given. One or more of these can be used in combination. The cement concrete as used in the present invention is a general term for cement milk, mortar, or concrete.

[0018] The composition for ground improvement material of the present invention preferably contains silica fume as a component other than the blast furnace fume from the viewpoint of improving the permeability to the ground. Of these, the use of acidic silica fume is preferred. It is also preferable to contain acidic silica fume and normal silica fume.

Here, the acidic silica fume means that the pH of the supernatant liquid when the silica fume lg is put into pure lOOcc and stirred is 5 or less.

Although the fineness of silica fume is not particularly limited, it is usually preferred to have a BET specific surface area of about 2 to 200,000 m ² / g.

[0019] The ground improvement material composition of the present invention is preferably used in combination with fine powder of cement or calcium carbonate as a component other than the blast furnace fume in order to further enhance the durability. Durability is hardened physical strength improved by ground improvement material. It is possible to evaluate by checking "water".

The above-mentioned composition for ground improvement material of the present invention is more widely used than the ground improvement material that has been widely used in the past, such as ground improvement material mainly composed of blast furnace slag fine powder. There is a feature that is excellent in durability.

[0020] The above-mentioned cement or calcium hydroxide hydroxide (hereinafter referred to as cements! /, U) has a maximum particle size of 40 μm and is substantially free of particles exceeding 40 / zm. preferable. Specifically, cements having a content ratio of particles exceeding 40 μm of 1% or less and a maximum particle size of 30 μm are more preferable. The average particle size is preferably 10 m or less, more preferably 5 m or less. If the maximum particle size of cements exceeds 0 m, the permeability may deteriorate. In the present invention, the average particle diameter is measured by a laser diffraction particle size distribution measuring device.

[0021] The calcium hydroxide calcium hydroxide is not particularly limited, but can be obtained by hydrating quick lime, and commercially available products can be used.

Furthermore, these cements may be finely powdered by a pulverizing operation, or a fine powder portion can be obtained by a classification operation.

[0023] The blending ratio of each material in the composition for ground improvement material of the present invention is not particularly limited, but 10 to 90 parts of silica fume is preferable in a total of 100 parts of blast furnace fume and silica fume. ~ 80 parts are more preferred. If the silica fume is less than 10 parts, the effect of improving the permeability may not be fully expected. Conversely, if the silica fume exceeds 90 parts, the strength development will not be sufficient, and the water to be released tends to become apparent.

Of the total 100 parts of blast furnace fume and cement, 1 to 50 parts of cement is preferred and 3 to 30 parts is more preferred. If the blending ratio of the cement is less than 1 part, the effect of improving the initial strength may not be expected, and if it exceeds 50 parts, the permeability tends to deteriorate.

[0024] When the above ground improvement material composition of the present invention is used, the amount of water used is preferably 50 to 500 parts, more preferably 100 to 300 parts, with respect to 100 parts of the ground improvement material composition. If it is less than 50 parts, the permeability may not be sufficient, and if it exceeds 500 parts, it may be difficult to ensure durability. [0025] When the ground improvement material composition of the present invention contains a blast furnace fume, cement, and an alkali thickening polymer emulsion, the amount of the blast furnace fume used is the quality of the blast furnace fume. However, generally, it is preferably 30 to 500 parts force S, more preferably 50 to 300 parts per 100 parts of cement. If the amount is less than 30 parts, the viscosity may not increase, the fluidity may increase, or the inseparability in water may decrease.If the amount exceeds 500 parts, the viscosity becomes too high, and the composition for the ground improvement material is kneaded. Mixing may be difficult.

[0026] The alkali thickened polymer emulsion (hereinafter referred to as the present emulsion) used in the composition for improving ground according to the present invention is a polymer emulsion that is thickened by alkali.

[0027] Examples of the emulsion include various unsaturated carboxylic acids, ethylenically unsaturated compounds, copolymers of unsaturated carboxylic acids and ethylenically unsaturated compounds, and the like. A polymer emulsion obtained by copolymerization of an unsaturated carboxylic acid and an ethylenically unsaturated compound is preferred in terms of exhibiting a more excellent effect.

Examples of the polymerization method of the unsaturated carboxylic acid and the ethylenically unsaturated compound include a method of copolymerization by a method such as emulsion polymerization, suspension polymerization, solution polymerization, or bulk polymerization.

[0028] 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; maleic anhydride and citraconic anhydride And unsaturated carboxylic acid anhydrides such as monomethyl itaconate, monobutyl itaconate, and monoethyl ethyl maleate. Of these, alicyclic acid and Z or methacrylic acid are more preferred, and unsaturated carboxylic acid is preferred in terms of higher viscosity.

[0029] The ethylenically unsaturated compound is not particularly limited, but is preferably an acrylate monomer and / or a methacrylic acid ester monomer in terms of higher viscosity. Acrylic acid esters include methyl acrylate, ethyl acetate, butyl acrylate, hexyl acrylate, cyclohexyl acrylate, octyl acrylate, hydroxyethyl acrylate, 2-ethyl hexyl acrylate, glycidyl Atari Rate and so on. Examples of the methacrylic acid ester include methyl methacrylate, ethyl methacrylate, butyl methacrylate, hydroxyethyl methacrylate, glycidino methacrylate.

[0030] The copolymerization ratio of unsaturated carboxylic acids and ethylenically unsaturated compounds of this emulsion is preferably unsaturated carboxylic acids: ethylenically unsaturated compounds = 20: 1 to 1:20 in terms of more excellent viscosity. More preferred is 5: 1 to 1: 5. Outside this range, good alkali thickening may not be obtained.

[0031] The amount of the present emulsion used is preferably 0.1 to 2 parts in terms of solid content with respect to 100 parts of cement, more preferably 0.2 to 1 part. If the amount is less than 1 part, the thickening effect is reduced, the fluidity is increased, and the inseparability in water may be reduced. If the amount exceeds 2 parts, the initial strength developability may be reduced.

[0032] The composition composition for ground improvement material of the present invention can further use a curing accelerator. If curing of the ground improvement material composition is delayed, bleeding (floating water) which is a kind of material separation occurs, and voids are generated after curing, resulting in structural defects.

The curing accelerator used in the present invention accelerates the curing of the ground improvement material composition, reduces bleeding, suppresses void formation, and contributes to strength development.

[0033] Examples of the curing accelerator include sulfates such as lithium sulfate, sodium sulfate, potassium sulfate, magnesium sulfate, calcium sulfate, aluminum sulfate, potassium alum, and iron sulfate; lithium carbonate, sodium carbonate, potassium carbonate, etc. Carbonate; lithium hydroxide, sodium hydroxide, magnesium hydroxide, aluminum hydroxide, potassium hydroxide, calcium hydroxide and other hydroxides; salt calcium, magnesium chloride, salt iron, etc. Salts; aluminates such as lithium aluminate, sodium aluminate, potassium aluminate and calcium aluminate; Amines such as min; organic acid calcium such as calcium formate and calcium acetate Salt; silica sol, colloid such as alumina sol, and the like. One or more of these can be used in combination. Among these, a combination of aluminate and sulfate, which is preferred for aluminate and Z or sulfate, is more preferred in terms of excellent curing acceleration and strength development. [0034] Among the aluminates, calcium aluminate (hereinafter, also referred to as CA) is preferable in terms of hardening acceleration and strength development. CA is a general term for compounds containing CaO and Al 2 O as main components.

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For example, the main ingredients are CaO and AlO, which are obtained by mixing a raw material containing strong lucia and a raw material containing alumina, etc., and performing heat treatment such as firing in a kiln or melting in an electric furnace. When

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This is a general term for the compounds. Specific examples include Ca02Al O, CaO 2 -Al O, 1

2 3 2 3

2CaO-7AlO, HCaO-7AlO-CaF, 3CaO-AlO, and 3CaO'3AlO-Ca

2 3 2 3 2 2 3 2 3

Crystalline calcium aluminates such as SO, and CaO and AlO as the main components

4 2 3 amorphous compounds. Among these, an amorphous 12C aO-7Al O composition is more preferable in terms of strength development.

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The fineness of calcium aluminate is preferably 3,000 cm ² / g or more in terms of brain value, more preferably 5,000 cm ² / g or more. If it is less than 3,000 cm ² / g, the initial strength development may be small.

[0035] Among the sulfates, calcium sulfate and Z or aluminum sulfate are preferable in terms of hardening acceleration and strength development. Examples of calcium sulfate include anhydrous gypsum, hemihydrate gypsum, and dihydrate gypsum. Of these, anhydrous gypsum is preferred in terms of curing acceleration and strength development.

The fineness of the sulfate is preferably 3,000 cm ² / g or more, more preferably 5,000 cm ² / g or more in terms of Blaine specific surface area. If it is less than 3,000 cm ² / g, strength development may be small.

[0036] When a combination of aluminate and sulfate is used as a curing accelerator, the amount of sulfate used is preferably 20 to 500%, more preferably 50 to 150 咅 per 100 咅preferably Ri, ₀ 20 parts less than the initial strength development forces, may become fence, and more than 500 parts fluidity size no longer, water nondisjunction resistance is reduced, if the long-term strength development decreases is there.

[0037] The amount of curing accelerator used varies depending on the type and cannot be uniquely defined, but in general, 1 to 30 parts is preferable to 100 parts of cement. 2 to 20 parts Is more preferable. If the amount is less than 1 part, the fluidity increases, the inseparability in water decreases, and the strength development may decrease. If the amount exceeds 30 parts, the viscosity increases and the pumping distance may be shortened.

[0038] The composition for ground improvement material comprising the cement of the present invention, aggregates such as sand and gravel, reduction It is also possible to use a liquid medicine and an antifreeze agent in combination.

[0039] The amount of water to be mixed with the cement in the present invention is not particularly limited, but is preferably 100 to 300 parts, more preferably 150 to 200 parts with respect to 100 parts of cement. If it is less than 100 parts, mixing of the soil improvement material composition containing cement may be difficult, and if it exceeds 300 parts, the fluidity increases and the inseparability in water S may decrease. is there.

[0040] When the composition for ground improvement material of the present invention contains blast furnace fume, cement, and the present emulsion, the method of using the blast furnace fume, cement, and water is not particularly limited. A method of mixing the liquid A prepared by mixing the liquid B containing the emulsion and water immediately before use is preferred because the viscosity can be increased rapidly. It is to be noted that mixing the present emulsion with water in advance to form a solution or suspension improves the mixing property and also favors the surface force of thickening.

[0041] The emulsion is preferably used by mixing with water. In this case, the amount of water used is not particularly limited, but when using a curing accelerator that is preferably diluted with 5 to 20 times the solid content of the emulsion, it is 1 to 3 times. It is preferred to dilute to If the amount of water is less than this, the viscosity may increase and the mixing property may deteriorate, and if the amount of water increases, the dilution effect of the diluted water increases and the inseparability in water may deteriorate. The remaining water can be mixed with cement and blast furnace fume, and the A liquid of the cement-blast furnace fume liquid and the B liquid of this emulsion can be pumped separately and combined and mixed at the nozzle tip. In particular, it is better to use the force without mixing and mixing at the tip of the nozzle separately by pumping separately the B liquid of this emulsion liquid that has been doubled by mixing A liquid of cement blast furnace fume liquid and this emulsion and water. preferable.

[0042] As the above-mentioned method of merging and mixing, a method using a mixing tube such as a Y-shaped tube, a method using a double tube, and the B liquid of this emulsion liquid in a shower form are used as a cement blast furnace fume liquid A. For example, a method of using an inlet piece in order to join and mix the liquid. Moreover, in order to mix more uniformly, the method of setting the spiral mixer in the pipe | tube after merging mixing and mixing further is also mentioned.

[0043] When the composition for ground improvement material of the present invention contains a blast furnace fume, cement, the present emulsion, and a curing accelerator, the method of use is particularly limited as described above. However, it contains liquid A containing blast furnace fume, cement and water, liquid containing curing accelerator and water (hereinafter referred to as curing accelerator liquid), this emulsion and water. Liquid B mixed with the liquid (hereinafter referred to as the present emulsion liquid) immediately before use, or mixed with blast furnace fume, cement, and water A liquid, Method of mixing B liquid consisting of hardening accelerator liquid and C liquid of this emulsion liquid just before use Force It is preferable because the viscosity can be increased rapidly.

[0044] When the emulsion and the curing accelerator are mixed with water in advance to form a solution or suspension, the mixing property is good and the surface force of thickening is also preferable. In this case, the amount of water used is not particularly limited. However, in the case of this emulsion, in the case of a curing accelerator that is preferably diluted with 5 to 20 times the solid content of this emulsion, It is preferable to dilute with 1 to 3 times the water. If the amount of water is less than this, the viscosity may increase and the mixing property may decrease, and if the amount of water increases, the fluidity may increase and the inseparability in water may decrease.

[0045] In the present invention, the A liquid obtained by mixing blast furnace fume, cement, and water, and the B liquid obtained by mixing the curing accelerator liquid and the present emulsion liquid are separately pumped to obtain a nozzle. It is also possible to use by mixing and mixing at the tip. In particular, three types of liquids, A liquid made of blast furnace fume, cement, and water, B liquid made of hardening accelerator liquid, and C liquid made of this emulsion liquid, are separately pumped and merged and mixed at the nozzle tip. It is more preferable to use them.

[0046] Further, since the curing accelerator may be cured within one hour after mixing with water, it is preferable to use a retardation agent in combination. Examples of retarders include oxycarboxylic acids such as citrate, tartaric acid, darconic acid, and malic acid, or sodium salts and potassium salts thereof, boric acid, tripolyphosphate, pyrophosphate, and the like. One type or two or more types can be used in combination. Among these, oxycarboxylic acid and Z or oxycarboxylate are preferable to quenic acid and Z or sodium citrate because they have a large delay effect.

The amount of retarder used is preferably 0.01 to 10 parts per 100 parts of cement, more preferably 0.05 to 5 parts. If the amount is less than 01 parts, the delay effect may be small, and if it exceeds 10 parts, the strength development may be small. [0047] As the method of merging and mixing described above, a method using a mixing tube such as a Y-shaped tube, a method using a triple tube, and an inlet piece are used to prepare B and B of the accelerator. Examples include a method in which the liquid C is mixed and mixed into a liquid A obtained by mixing cement, blast furnace fume, and water in the form of a shower.

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

[0048] The blast furnace fume used for the injection material using the composition for ground improvement material according to the present invention is a dust collecting dust collected from the blast furnace when the pig iron is obtained in the steel manufacturing process. It can be used as it is, and further, it can be pulverized and classified to be used as a fine powder. In the present invention, it is preferable to classify and use so that the maximum particle diameter is 20 μm or less so that high permeability to the ground can be obtained.

[0049] An injection material using the ground improvement material composition containing the blast furnace fume, calcium aluminate or calcium aluminosilicate, gypsum, and alkali stimulating material of the present invention! On the other hand, the calcium aluminosilicate used (hereinafter referred to as CAS) is CaO, Al 2 O, and SiO 2

It contains 2 3 2 and contributes mainly to the development of short-term strength when used in combination with gypsum.

The composition of CAS is that CaO content is 20-60%, AlO content is 20-70%, and SiO

2 3 2 5 to 30% content is preferred CaO content 30 to 55%, Al O content 30 to 60%, and

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And SiO content of 10 to 20% is more preferable. When the short-term strength is smaller outside this range

2

There is.

[0050] CAS is made up of a predetermined amount of powerful Lucia raw materials such as limestone, alumina raw materials such as alumina, bauxite, feldspar, and clay, and silica raw materials such as keystone, keystone, quartz, and keystone. After blending, it is manufactured by firing in a rotary kiln or the like, or melting in an electric furnace or high-frequency furnace.

[0051] CAS includes crystalline compounds such as 2CaO'Al O -SiO and CaO 'Al O -2SiO.

2 3 2 2 3 2

Although it is possible to use it, a glassy material obtained by quenching the melt in terms of high short-term strength is preferred.

The vitrification rate of CAS is as follows: CAS is heated at 1,000 ° C for 2 hours and then cooled at a rate of 5 ° CZ. Gradually cool, and determine the area S of the main peak of the crystalline mineral by powder X-ray diffractometry.

0

From the main peak S of the crystal, it is obtained as X (%) = 100 X (1—szs). Short-term strength

0

From the aspect, 50% or more is preferable. 80% or more is more preferable. 90% or more is more preferable. If it is less than 50%, the short-term strength may be small.

[0052] The amount of CAS used is preferably 1 to 50 parts, more preferably 5 to 30 parts per 100 parts of blast furnace fume. If the amount is less than 1 part, the short-term strength is small. If it exceeds 50 parts, the viscosity when the injection material is made into a suspension increases and the permeability to the ground may decrease.

[0053] In addition, the calcium aluminate used in the above-mentioned injection material of the present invention contributes mainly to the development of strength by the combined use with gypsum. As specific examples, any of those exemplified above can be used as the CA contained in the composition composition for ground improvement material. Among these, the CaO / Al 2 O molar ratio is 1 from the viewpoint of hardening time and strength development of the injected material.

twenty three

It is preferable to select an amorphous material in ˜2.

[0054] The vitrification rate of CA is determined as X (%) = 100 X (l-SZ S), exactly as in the case of CAS described above. However, S and S are obtained in the same way as CAS. Short-term strength

0 0

[0055] CA heat-treats CaO raw materials and Al O raw materials with a rotary kiln or electric furnace

twenty three

It is obtained by the method. The raw materials for producing CA are not particularly limited. Examples of the CaO raw material include calcium carbonate such as limestone and shells, slaked lime, and quicklime.AlO raw materials include, for example, bauxite and Product called aluminum residue

twenty three

In addition to industrial by-products, aluminum powder is included.

[0056] The amount of CA used is preferably 1 to 50 parts, more preferably 5 to 30 parts per 100 parts of blast furnace fume. If it is less than 1 part, the short-term strength is small. If it exceeds 50 parts, the viscosity when the injection material is made into a suspension increases, and the permeability to the ground may decrease.

[0057] Further, examples of the gypsum used in the injection material of the present invention include anhydrous gypsum, hemihydrate gypsum, and dihydrate gypsum. Furthermore, natural gypsum, chemical gypsum such as phosphate byproduct gypsum, waste gypsum, hydrofluoric acid byproduct gypsum, or gypsum obtained by heat-treating these can be used. Of these, strength development is great! / Anhydrous gypsum is preferred. The amount of gypsum used is preferably 1 to 50 parts and more preferably 5 to 30 parts per 100 parts of blast furnace fume. If less than 1 part, short-term strength is small. If it exceeds 50 parts, the permeability to the ground may be reduced.

[0058] Furthermore, the alkali stimulating material used in the above-mentioned injecting material of the present invention contributes to hardening and an increase in long-term strength when used in combination with a 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 is not particularly limited, slaked lime is preferred from the standpoints of curing by combining with blast furnace fume and increasing long-term strength. The amount of the alkali stimulant used is more preferably 3 to 20 parts, preferably 1 to 50 parts per 100 parts of the blast furnace fume. If less than 1 part, long-term strength is small. If it exceeds 50 parts, the permeability to the ground may decrease.

[0059] The maximum particle size of the injection material in the present invention is preferably 20 μm, most preferably 15 μm, and most preferably 10 m or less. If it exceeds 20 / z m, injection into fine gaps may be difficult depending on the geology of the ground.

[0060] The method for adjusting the particle size of the injection material is not particularly limited, but each material is separately pulverized with a pulverizer such as a ball mill, and those having a size of 20 m or less are collected by classification and then mixed Alternatively, it is possible to use any of the methods in which each material is mixed and then pulverized and collected by classification to collect less than 20 / zm. However, if the materials are mixed and then pulverized and classified, the mixing ratio may change due to the density difference between the materials. Therefore, it is preferable to pulverize, classify and then mix each material separately. ,.

[0061] Furthermore, in the present invention, it is preferable to use a coagulation modifier in order to adjust the required curing time to be obtained.

Condensation regulators 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, aluminum sulfate, iron sulfate (111) And sulfates such as alum, silicates such as sodium and potassium silicates, phosphates such as sodium phosphate, calcium phosphate and magnesium phosphate, and boron such as lithium borate and sodium borate Examples thereof include inorganic salts such as acid salts, citrate, darconic acid, tartaric acid, malic acid or organic acids such as sodium salt, potassium salt and calcium salt thereof or metal salts thereof, and saccharides. One or two or more of these can be used in combination. Among these, it is preferable to use a carbonate and an organic acid in combination in order to secure a required curing time.

[0062] The amount of setting modifier used is not particularly limited because it is adjusted according to the setting time, but 0.1 to 10 parts per 100 parts of CAS or CA and gypsum in total. Favorable 0.

5 to 5 parts are more preferable. If it is less than 1 part, it may be difficult to secure the curing time, and if it exceeds 10 parts, the curing time may be longer and the strength may be reduced.

[0063] In order to improve the permeability into the ground, it is preferable to further use a dispersant in the present invention.

Examples of the dispersant include naphthalene sulfonic acid formalin condensate salt type, ligne sulfonic acid type, melamine sulfonic acid formalin condensate salt type, polycarboxylate type, and polyether type dispersants.

The amount of dispersant used is 0.1 to 100 parts of the blast furnace fume.

More preferred is 3 parts. 0. If less than 1 part, permeability may be low, and if it exceeds 10 parts, strength may be low.

[0064] 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, but the total of blast furnace fume, CAS or CA, gypsum, and alkali stimulating material is 100. 100-1,000 咅 is preferred for 咅 <, 200-500 咅 is preferred! If the amount is less than 100%, the viscosity of the suspension may be high and the permeability may be small. If the amount exceeds 1,000 parts, the strength may be small.

[0065] The mixing method and the injection method of the injection material are not particularly limited. Single tube rod method, single tube strainer method, double tube single phase method, double tube double phase method, and double tube double packer Applicable to currently used construction methods such as construction methods.

Example

Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not construed as being limited thereto. [0067] Example 1 1

A ground improvement material composition was prepared by blending the blast furnace fume and silica fume shown in Table 11 and added to 150 parts of the prepared ground improvement material composition. A material was prepared, and the permeability of the ground improvement material and the durability of the improved body after curing were confirmed.

For comparison, the same experiment was also performed when blast furnace slag fine powder or water glass ground improvement material was used instead of the ground improvement material composition of the present invention. The results are also shown in Table 11.

[0068] <Materials used>

Blast furnace fume: Made in China, commercially available, SiO 25%, Fe O 3%, Al O 13%, CaO 1

2 2 3 2 3

9%, MgO 6%, Na 2 O 1.3%, K 2 O 9%, SO 10%, S 0.3%, and MnO

2 2 3

0.2 ^_0/0, Blaine 21,000cm ² / g, a maximum particle size ί or 30 mu m, an average particle diameter ί or 4 mu m silica fume: commercially available acidic silica fume, the average particle diameter of 0. 1 m, Blaine Value 150,000

2 /

cm / g

Blast furnace slag fine powder: Fine powder of granulated blast furnace slag, maximum particle size 5 m, average particle size 5 m

Water glass-based ground improvement material: Commercial product, the main component is water glass, the secondary component is sodium carbonate Water: tap water

[0069] <Measurement method>

Penetration: Fill a 5cm diameter x 30cm vinyl tube with No. 8 key sand to a height of 20cm, drill a hole of about 0.5mm in the bottom of the vinyl tube, and then apply 250cc of ground improvement material on the top surface. Measure the depth of penetration after 1 day

Durability: The cured product obtained in the permeability test was observed until the age of 91 days, and the water to be removed was measured and evaluated. The water to be removed was measured by measuring the weight of the water that had been dropped in the bottom of the vinyl tube and the volume of the ground improvement material was 250cc.

[0070] [Table 1] Table 1 1 1

Blast furnace fumes, silica fumes, ground granulated blast furnace slag, and water glass ground improvement materials are (part)

[0071] Example 1 2

Experiments were conducted in the same manner as in Experiment 1-1 except that the blast furnace fume, silica fume, and cements shown in Table 1-2 were used. The results are also shown in Table 1-2.

[0072] <Materials used>

Cement A: Commercially available fine powder cement, maximum particle size 40 μm, average particle size 5 μm

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

[0073] [Table 2] Table 1-2

Blast furnace fume, silica fume, and cement are (part)

[0074] Experimental Example 2-1

The blast furnace fume of the amount shown in Table 2-1 and water were kneaded with a mixer to 100 parts of cement to prepare solution A. Next, with respect to 100 parts of cement, 5 parts of emulsion human water of 0.5 parts in terms of solid content was mixed to prepare B liquid.

Liquid B was added to liquid A and kneaded for 5 seconds to prepare a kneaded product, and its flow, inseparability in water, and compressive strength were measured.

For comparison, the same experiment was conducted using bentonite instead of blast furnace fume. The results are also shown in Table 2-1.

[0075] <Materials used> Cement: Ordinary Portland cement, commercial product

Emulsion α: This emulsion, solid content concentration 30%, Ethyl acrylate: Methacrylic acid

= 45: 55 ethyl acetates リ Methacrylic acid copolymer polymer emulsion

Blast furnace fume: A commercial product from China. SiO 25%, Fe O 3%, Al O 13%, CaO 1

2 2 3 2 3

9%, MgO 6%, Na 2 O 1.3%, K 2 O 9%, SO 10%, S 0.3%, and MnO 0

2 2 3

2%, Brain value 21,000cm ² / g, Maximum particle size 30 μm, Average particle size 4 μm Bentonite: commercial products

[0076] <Measurement method>

Flow: Put the kneaded material into a cylinder with an inner diameter of 80mm x height of 80mm, then pull out the cylinder V, and measure the spread after 2 minutes

Underwater inseparability: Performed according to the underwater separation test in the Annex to the Guidelines for Design and Construction of Underwater Non-Isolated Concrete by the Japan Society of Civil Engineers, excellent when there is no water turbidity, good when there is little turbidity, good water Although it was turbid, it was acceptable when it was practical, and when material was separated and the turbidity of water was large.

Compressive strength: Measured according to JIS R 5201

[0077] [Table 3]

Table 2 — 1

Furnace fumes and water for 100 parts of cement (parts), compressive strength is

(N / thigh ² ), Experiment No. 2-1-7 * 1 uses bentonite instead of blast furnace fumes [0078] 100 parts of cement, 200 parts of blast furnace fume, and 180 parts of water were kneaded with a mixer to prepare solution A. Emulsion shown in Table 2-2 and 10 times the amount of emeraldion with respect to 100 parts of cement The same procedure as in Experimental Example 2-1 was conducted except that liquid B was prepared by mixing with water.

For comparison, a similar experiment was conducted using a non-emulsion having no alkali thickening instead of this emulsion. The results are also shown in Table 2-2.

[0079] <Materials used>

Emulsion j8: This Emulsion, solid content concentration 30%, Ethyl acrylate: Methacrylic acid = 45: Ethylene Z acetate butyl copolymer 70 parts, Ethylene: Butyl acetate = 18:82 Ethyl Atalylate Z acrylic acid copolymer polymer emulsion 30 parts mixture

Emulsion γ: This emulsion, solid concentration 30%, Styrene: 2-Ethylhexyl acrylate = 45: 55 Styrene Ζ 2-Ethylhexyl acrylate copolymer copolymer Emulsion

[0080] [Table 4]

Table 2— 2

This emulsion is (parts) in terms of solid content with respect to 100 parts of the cement, and the compressive strength is (N / mm ² ). [0081] Experimental Example 3-1

A liquid A was prepared by mixing the amount of blast furnace fume and water shown in Table 3-1 with 100 parts of cement using a mixer. Next, 100 parts of cement is mixed with 5 parts of hardening accelerator a and 10 parts of water to prepare solution B, and 0.5 parts of this emulsion a and 5 parts of water in terms of solid content are mixed with C. A liquid was prepared.

Liquid A, Liquid B and Liquid C were continuously added to the mixer and mixed for 5 seconds to prepare an injection material, and then the flow, water inseparability, and compressive strength were measured. For comparison, the same procedure was performed using bentonite instead of blast furnace fumes. The results are also shown in Table 3-1.

[0082] <Materials used>

Cement: Ordinary Portland cement, commercial product

Blast furnace fume: China, commercially available, SiO 25%, Fe O 3%, Al O 13%, CaO 1

2 2 3 2 3

9%, MgO 6%, Na 2 O 1.3%, K 2 O 9%, SO 10%, S 0.3%, and MnO

2 2 3

0.2 ^_0/0, Blaine 21, 000cm ² / g, a maximum particle size ί or 30 mu m, an average particle diameter ί or 4 mu m Emarujiyon alpha: the Emarujiyon, solid concentration of 30% E chill Atari rate: Methacrylic acid = 45: 55 ethyl acrylate. Ζ Methacrylic acid copolymer polymer emulsion

Curing accelerator &: 12 pcs & 0 '7 8 1 Ο Calcium aluminate composition, vitrification rate 95%, blurring

twenty three

Equal mixture of aluminate with a 6,000 cm ² / g and an anhydrous gypsum and sulfate with a brane value of 5,400 cm ² / g

Bentonite: General merchandise

[0083] <Measurement method>

Flow: Measure the spread after pulling out the cylinder after 2 minutes of pouring the injected material into a cylinder with an inner diameter of 80mm and height of 80mm.

Underwater inseparability: Performed according to the underwater separation test in the Annex to the Guidelines for Design and Construction of Underwater Non-Isolated Concrete by the Japan Society of Civil Engineers, excellent when there is no water turbidity, good when there is little turbidity, good water Although turbidity is present, it was acceptable when practical, and when material was separated and the turbidity of water was large.

Compressive strength: Measured according to JIS R 5201

[0084] [Table 5] Table 3— 1

Blast furnace fume and water for 100 parts of cement (part), Experiment No.

3- 1-7 * uses bentonite instead of furnace fume

[0085] Example 3-2

Mix 100 parts of cement, 200 parts of blast furnace fume and 180 parts of water with a mixer to prepare liquid A, and prepare 100 parts of cement by mixing 5 parts of hardening accelerator a and 10 parts of water. The same procedure as in Experimental Example 3-1 was conducted, except that the emulsion C shown in Table 3-2 and 10 times the amount of emulsion were mixed to prepare solution C.

For comparison, the same procedure was performed using a non-emulsion having no alkali thickening instead of this emulsion. The results are also shown in Table 3-2.

[0086] <Materials used>

Emulsion Y8: This Emulsion, solid content concentration 30%, Ethyl Attalate: Methacrylic acid = 45: 55 Ethyl Attalate Z methacrylic acid copolymer polymer Emulsion 70 parts, Ethylene: Bull acetate = 18: 82 Ethylene Z Acetate Bull Copolymer Emulsion 3 0 parts mixture

Emulsion γ: This emulsion, solid concentration 30%, Styrene: 2-Ethylhexyl acrylate = 45: 55 Styrene Ζ 2-Ethyl hexyl acrylate copolymer copolymer emulsion

[0087] [Table 6] Table 3-2 Experiment Emanole port Underwater incompressible strength (N / ram ² )

Remarks

No. 3 (m single value

m) Separability 7 曰 2 8 曰

3- 2-1 ― 0 245 No 2.5 5.7 Comparison example

3- 2-2 a 0 1 90 Possible 2.7 6.9 Example

3- 2- 3 a 0. 2 85 Good 2.5 6.6 Examples

3- 2-4 a 0 5 85 Excellent 2.4 6.3 Examples

3- 2-5 a 1 0 85 Excellent 2.2 6.2 Example

3--2-6 a 2 0 85 Excellent 2.1 5.9 Examples

3- -2-7 β 0 1 95 Yes 2.2 6.0 Examples

3- ■ 2-8 β 0 5 85 Good 1.8 5.4 Example

3- 2- 9 β 1 0 85 Excellent 1.6 5.2 Examples

3--2-10 Ύ 0 5 175 Yes 3.0 6.6 Comparative example

This emulsion is used for solid fractionation of 100 parts of cement.

(Part)

[0088] Example 3-3

Mix 100 parts of cement, 200 parts of blast furnace fume, and 180 parts of water with a mixer to prepare liquid A, and mix 100 parts of cement with 5 parts of this emulsion water that is 0.5 parts in terms of solid content. C liquid was prepared. As in Experimental Example 3-1, except that 100 parts of cement was mixed with hardening accelerator shown in Table 3-3, twice its amount of water, and 0.1 part of retarder to prepare B liquid. went. The results are also shown in Table 3-3.

[0089] <Materials used>

Curing accelerator b: sulfate, aluminum sulfate, commercial product

Curing accelerator c: carbonate, sodium carbonate, commercial product

Curing accelerator d: Hydroxide, calcium hydroxide, commercial product

Curing accelerator e: aluminate, sodium aluminate, commercial product

Curing accelerator f: Colloid, silica sol, commercial product

Retardant ： Chenic acid, commercial product [0090] [Table 7]

Table 3— 3

Experiment Hardening Mouth Underwater incompressible strength (N / mm ² )

Price Remarks

No. Accelerator (mm) Separability 7 曰 2 8 0

3- -3-1 ― 0 85 Excellent 1.4 5 3 Comparative example

3- -3- 2 a 1 85 Excellent 1.9 5 5 Example

3- -3-3 a 2 85 2.0 5 8 Example

3- -3-4 3 85 Excellent 2.2 6 0 Example

3- -3-5 a 10 85 Excellent 2.6 6.5 Example

3- -3- 6 a 20 85 Excellent 2.8 6 7 Example

3--3- 7 30 85 Excellent 3.5 6 9 Example

3- -3-8 b 5 85 Excellent 2.0 6 1 Example

3- -3-9 c 5 85 Excellent 1.8 5 7 Example

3--3-10 d 5 85 Excellent 1.7 5 8 Example

3--3-11 e 5 85 Excellent 1.9 6 0 Example

3--3-12 f 5 85 Excellent 1.6 5 6 Example

Accelerator is 100 parts of cement (parts)

[0091] Example 4 1

For 100 parts of blast furnace fume, CAS, gypsum and alkali stimulating materials shown in Table 4-1 were mixed to prepare an injection material with a maximum particle size of 30 / zm. A suspension was prepared by mixing 100 parts of the prepared injection material and 300 parts of water. At this time, 1 part of the dispersant is mixed with 100 parts of the blast furnace fume, and 1 part of the setting modifier is mixed with 100 parts of CAS and gypsum, and the hardening time, penetration length, And the compressive strength was measured. The results are also shown in Table 41.

[0092] <Materials used>

2 2 3 2 3

9%, MgO 6%, Na 2 O 1.3%, K 2 O 9%, SO 10%, S 0.3%, and MnO

2 2 3

0.2 ^_0/0, Blaine 21,000cm ² / g, a maximum particle size ί or 30 mu m, an average particle diameter ί or 4 mu m CASi: Glass with a composition of Ca0 45%, A1 0 40%, and SiO 15%, vitrification rate

2 3 2

95%

CAS: Glass with a composition of CaO 45%, A1 0 28%, and SiO 27%, vitrification rate

2 3 2

95%

Gypsum: Natural anhydrous gypsum

Alkali stimulant: slaked lime, commercial product

Dispersant: Naphthalenesulfonic acid formalin condensate salt system

Setting agent: Mixture of 1: 3 weight ratio of citrate and potassium carbonate

[0093] <Test method>

Penetration length: Filled a 5cm diameter X 30cm length vinyl tube with No. 8 silica sand to a length of 20cm, put 200ml of the injected material one day later, and measured the penetration length into the sand.

Curing time: Time until the suspension does not flow even when the cup containing the suspension is tilted Compressive strength: Measured according to JIS R 5201, measured material age 1 day and 28 days

[0094] [Table 8]

Table 4

C A S, stone growth, and alkaline stimulants are (parts) for 100 parts of blast furnace fume Example 4-2

For 100 parts of blast furnace fume, 10 parts of CASi, 10 parts of gypsum, and 5 parts of alkali stimulating material were mixed to prepare an injection material with the maximum particle size shown in Table 4-2. Similarly, the curing time, penetration length and compressive strength were measured. The results are also shown in Table 42. [0096] [Table 9]

Table 4-2

[0097] Example 5-1

An injection material with a maximum particle size of 30 / zm was prepared by mixing 100 parts of blast furnace fume with CA, gypsum and alkali stimulating materials shown in Table 5-1. A suspension was prepared by mixing 100 parts of the prepared injection material and 300 parts of water. At this time, 1 part of the dispersant is mixed with 100 parts of the blast furnace fume, 1 part of the setting modifier is mixed with 100 parts of the total of CA and gypsum, and the setting time and penetration length of the injected material are mixed. And the compressive strength was measured. The results are also shown in Table 5-1.

[0098] <Materials used>

2 2 3 2 3

9%, MgO 6%, Na 2 O 1.3%, K 2 O 9%, SO 10%, S 0.3%, and MnO

2 2 3

0.2 ^_0/0, Blaine 21,000cm ² / g, a maximum particle size ί or 30 mu m, an average particle diameter ί or 4 mu m CA I: amorphous 12CaO '7Al O, vitrification ratio of 95%

twenty three

CAP: crystalline CaO'AlO, vitrification rate 20%

twenty three

Gypsum: Natural anhydrous gypsum

Alkali stimulant: slaked lime, commercial product

Dispersant: Naphthalenesulfonic acid formalin condensate salt system

Setting agent: Mixture of 1: 3 weight ratio of citrate and potassium carbonate

[0099] <Test method>

Penetration length: Filled a 5cm diameter X 30cm length vinyl tube with No. 8 silica sand to a length of 20cm, put 200ml of the injected material one day later, and measured the penetration length into the sand. Curing time: Time until the suspension does not flow even when the cup containing the suspension is tilted Compressive strength: Measured according to JIS R 5201, measured material age 1 day and 28 days

[Table 10]

Table 5— 1

CA, gypsum, and alkali stimulant are for 100 parts of blast furnace fume (part) Example 5-2 100 parts of blast furnace fume is mixed with 10 parts of CA, 10 parts of gypsum, and 5 parts of alkali stimulating material to prepare an injection material with the maximum particle size shown in Table 5-2. Then, the curing time, penetration length, and compressive strength were measured. The results are also shown in Table 5-2.

[0102] [Table 11]

Table 5-2

Industrial applicability

[0103] Since the composition for ground improvement material of the present invention has good permeability and excellent durability, it can be widely used for void filling materials such as backfilling materials in ground improvement work and waterproofing work. In addition, the injection material using the composition for ground improvement material of the present invention is superior in permeability to the ground, high injectability, and excellent in strength development. Can be injected into the ground, and blast furnace fume, an industrial byproduct, can be used effectively

In addition, Japanese patent application 2004-327140 filed on November 11, 2004, Japanese patent application 2004-369240 filed on December 21, 2004, filed January 31, 2005 Japanese Patent Application No. 2005-022895, Japanese Patent Application No. 2005-0222896 filed on January 31, 2005 and Japanese Patent Application No. 2005-032719 filed on Feb. 9, 2005 The entire contents of the scope, drawings, and abstract are hereby incorporated by reference as the disclosure of the specification of the present invention.

Claims

The scope of the claims

[I] A composition for ground improvement material comprising blast furnace fume.

[2] The composition for ground improvement material according to claim 1, further comprising silica fume.

[3] The composition for ground improvement material according to claim 1 or 2, containing cement or calcium hydroxide having a maximum particle size of 40 μm.

[4] The composition for ground improvement material according to claim 1 or 2, comprising cement and an alkali thickening polymer emulsion.

[5] The composition for ground improvement material according to claim 3 or 4, wherein the blast furnace fume force is 30 to 500 parts by mass with respect to 100 parts by mass of cement.

[6] The composition for ground improvement material according to claim 4 or 5, which is a polymer emulsion obtained by copolymerization of an unsaturated carboxylic acid and an ethylenically unsaturated compound.

[7] The composition for ground improvement material according to any one of claims 1 to 6, further comprising a curing accelerator.

[8] The composition for ground improvement material according to claim 7, wherein the curing accelerator contains aluminate and Z or sulfate.

[9] The ground improvement material composition according to any one of claims 1 to 8, wherein the blast furnace fume force has a maximum particle size of 30 m.

[10] Blast furnace fume force SiO is 20-30%, Al O force is 10-15%, and CaO is 15-25%

2 2 3

The composition for ground improvement material of any one of Claims 1-9 which has these.

[II] An injection material using the composition for ground improvement material according to any one of claims 1 to 10.

[12] The injection material according to claim 11, comprising calcium aluminate or calcium aluminokeate, gypsum, and an alkali stimulant.

[13] The claim, comprising 1 to 15 parts by mass of calcium aluminate or calcium aluminoate, 1 to 50 parts by mass of gypsum, and 1 to 50 parts by mass of an alkali stimulant with respect to 100 parts by mass of the blast furnace fume. The injection material according to 11 or 12.

[14] The injection material according to any one of [11] to [13], wherein the maximum particle size is 20 m or less.

[15] Liquid A containing cement, blast furnace fume and water, and alkali thickened polymer emulsion Use of the composition for ground improvement materials in any one of Claims 4-10 which prepares the B liquid containing John and water, respectively, and mixes A liquid and B liquid just before use. Method.

[16] Liquid A containing cement, blast furnace fume and water, and liquid B containing a curing accelerator, an alkali-thickening polymer emulsion and water, were prepared in advance and immediately before use. The method for using the ground improvement material composition according to any one of claims 4 to 4, wherein the A liquid and the B liquid are mixed together.

[17] Liquid A containing cement, blast furnace fume, and water, Liquid B containing a curing accelerator and water, Alkali thickening polymer emulsion and water The method for using the composition for ground improvement material according to any one of claims 4 to: LO, wherein liquid C is prepared in advance, and liquid A, liquid B and liquid C are mixed immediately before use.