JP2003261367A - Composition for liquid quick setting agent, liquid quick setting agent, spray material and spraying method using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a composition for a quick setting agent capable of reducing the quantity of dust produced in spray work and having excellent quantitative accuracy of a material, excellent mixing property with cement concrete and excellent solidification characteristic, the liquid quick setting agent, a spray material and a spraying method using the same. <P>SOLUTION: The composition of the liquid quick setting agent contains a component of three elements of aluminum, sulfur and fluorine and further a low molecular amide compound and/or a low molecular thioamide compound as compound components and the liquid setting agent, the spray material and the spraying method using the spray material are provided. The spray material having features that 1. the quantity of dust in the spraying is reduced, 2. rebound ratio is decreased, 3. the adverse effects for human body due to alkali is eliminated, 4. the excellent quantitative property is attained, 5. the solidification characteristic is improved and 6. the forcible feeding property is improved compared to the conventional one is suitable for a spray work method for road, railway, the tunnel wall surface of a conduit or the like and the slope surface or the like. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid quick-setting admixture for use in spraying quick-setting cement concrete onto exposed ground in tunnels such as roads, railways, and water conduits, and slopes. The present invention relates to a composition for liquids, a liquid quick-setting agent, a spray material, and a spraying method using the same.

The term "cement concrete" used in the present invention is a general term for cement paste, mortar and concrete. Parts and% in the present invention are based on mass unless otherwise specified.

[0003]

2. Description of the Related Art Conventionally, in order to prevent the collapse of exposed ground during tunnel excavation work, etc., a method of spraying quick-setting concrete in which a powder quick-setting admixture is mixed with concrete has been used. (Japanese Patent Publication No. 60-4149,
JP-A-9-19910 and JP-A-10-87358).

The powder quick-setting agent used in these spraying methods is mainly composed of calcium aluminate and 1A.
A mixture of aluminate of group elements or aluminum sulfate was used.

However, in terms of safety, it has a pH value lower than that of the powder quick-setting admixture mainly containing 1A group element salts of aluminate, calcium aluminate, and 1A group element carbonates, etc. There has been a need for a weakly alkaline to acidic, preferably neutral or weakly acidic accelerator.

[0006] A part of the powder quick-setting admixture is not sufficiently mixed with cement concrete and is discharged as dust as it is, so that the amount of dust near the construction site is increased, which may be unfavorable from the working environment. In addition, the powder quick-setting admixture may cause a dust problem when the bag is unpacked in the powder pressure-feeding device on site.

[0007] The powder quick-setting admixture is a liquid quick-setting admixture because when the distance from the powder press-feeding device to the place where the cement concrete is press-fitted is long, the powder is sent by pressure by mixing powder and air. It was inferior in comparison with the above, and there were cases where the construction system was constrained, such as when the uniform blowing material had to be used, the pumping distance had to be shortened, and the diameter of the pumping hose had to be optimized. .

Further, a liquid quick-setting agent containing aluminum sulfate or the like as a main component is known (Japanese Patent Laid-Open No. 2000-21955).
No. 3, etc.) However, there is a problem with the setting property,
The liquid quick-setting admixture was limited to applications where it was sprayed thinly in a tunnel where the bedrock is strong, because there is a risk of flaking when it is blown thick in the tunnel where the bedrock is fragile.

In view of the above situation, the present inventors have made various studies to solve the above-mentioned problems, and as a result, it is possible to reduce the amount of dust when a specific spray material is sprayed and to reduce the rebound rate. The present invention has been completed based on the finding that it has the advantages of being harmless to the human body by alkalis, having good quantitative properties, good setting properties, and good pumpability.

[0010]

That is, the present invention is characterized by containing a three-element component of aluminum, sulfur, and fluorine, and containing a low-molecular amide compound and / or a low-molecular thioamide compound as a compound component. A composition for a liquid quick-setting admixture containing 100 parts of sulfur in terms of SO ₃ , 25 to 110 parts of aluminum in terms of Al ₂ O ₃ , 2.5 to 50 parts of element in terms of fluorine, and a low molecular weight compound. Amide compound and /
Or a liquid quick-setting composition characterized by containing 1 to 50 parts of a low molecular weight thioamide compound, and a liquid quick-setting agent characterized by containing the liquid quick-setting composition. , Al ₂ O ₃ equivalent aluminum component, SO ₃ equivalent sulfur component, element equivalent fluorine component, low molecular amide compound, and / or low molecular thioamide compound total content is 10-60% in the liquid quick-setting admixture. The liquid quick-setting agent is a spraying material containing the liquid quick-setting agent and cement concrete, and the spraying method is characterized by using the spraying material.

The present invention will be described in detail below. This composition for liquid quick-setting admixture contains three element components of aluminum (Al), sulfur (S), and fluorine (F), and a low molecular amide compound and / or a low molecular thioamide compound (N) as compound components. The composition is characterized by: For example, the above three elements such as a composition containing aluminum hydroxide (Al), sulfur flower (S), calcium fluoride (F), and N, N-dimethylformamide (N), and a low molecular amide compound And / or a low-molecular-weight thioamide compound.

In the present composition for liquid quick-setting admixture, a compound containing two or more of the three elements of aluminum, sulfur and fluorine, and each of the low molecular weight amide compound and / or low molecular weight thioamide compound is used. Is also good. For example, thioacetamide (N, S) and aluminum fluoride (F,
It may be a composition containing Al) or a composition containing calcium fluoride (F), thioacetamide (S, N), and aluminum sulfate (Al, S).

The aluminum feed material in the present invention is not particularly limited, and examples thereof include aluminum sulfate, aluminate, and other inorganic aluminum compounds, organic aluminum compounds, and aluminum complexes.

Examples of the aluminum sulfate include ammonium alum, aluminum hydroxysulfate, aluminum sulfate and the like.

Examples of the aluminate include lithium aluminate, sodium aluminate, potassium aluminate, calcium aluminate, magnesium aluminate and the like.

Other inorganic aluminum compounds include bauxite, aluminum oxide, aluminum hydroxide, aluminum chloride, aluminum phosphate, aluminum nitrate, aluminum fluoride, polyaluminum chloride, aluminum carbonate hydroxide, synthetic hydrotalcite,
And aluminum metasilicate.

Examples of the organic aluminum compound include aluminum stearate, aluminum oxalate, aluminum isopropoxide, and aluminum formate.

Examples of the aluminum complex include tris (8-hydroxyquinolinato) aluminum.

One or more of these aluminum compounds can be used. In the present invention, aluminum sulfate as a sulfur feedstock is preferred.

The sulfur feed material is not particularly limited, but in addition to elemental sulfur such as sulfur and sulfur flower, sulfide, sulfuric acid, sulfate, sulfurous acid, sulfite, thiosulfuric acid, thiosulfuric acid Examples thereof include sulfates and organic sulfur compounds.

Examples of the sulfide include magnesium sulfide, calcium sulfide, iron sulfide, phosphorus pentasulfide and the like.

Examples of the sulfates include alums such as sodium alum, potassium alum, and ammonium alum, aniline sulfate, aluminum sulfate, ammonium sulfate, magnesium sulfate, manganese sulfate, barium sulfate, calcium sulfate, and hydroxylamine sulfate. .

Examples of the sulfite include ammonium hydrogen sulfite and calcium sulfite.

Examples of thiosulfates include ammonium thiosulfate and barium thiosulfate.

Examples of the organic sulfur compound include resins such as sulfonic acid derivatives, salts of sulfonic acid derivatives, mercaptans, thiophenes, thiophene derivatives, polysulfones, polyether sulfones, and polyphenylene sulfides.

In the present invention, one or more of these sulfur compounds can be used. Among the above-mentioned sulfur compounds, sulfuric acid or sulfate is more preferable from the viewpoint of high solubility in water, low production cost, and excellent coagulation property, and alum among the sulfates is most preferable.

Further, the fluorine feed material is not particularly limited, but those which are dissolved or dispersed in the solvent contained in the liquid quick-setting agent are preferable. That is, an organic fluorine compound, a fluoride salt, a silicofluoride salt, a boron fluoride salt, a hexafluorophosphate salt and the like can be mentioned.

As the organic fluorine compound, Fluorinate,
And organic fluorine compounds such as CFCs.

Examples of the fluoride salt include aluminum fluoride, ammonium fluoride, calcium fluoride and the like.

Examples of silicofluoride salts include ammonium silicofluoride and magnesium silicofluoride.

As the boron fluoride salt, fluoroboric acid,
Examples thereof include boron trifluoride, boron trifluoride monoethylamine complex, boron trifluoride acetic acid complex, ferrous borofluoride, and ammonium borofluoride.

Examples of the hexafluorophosphate include hexafluorophosphoric acid, a salt of hexafluorophosphoric acid, and ammonium hexafluorophosphate.

One or more of these fluorine compounds can be used. In the present invention, a fluoride salt, a silicofluoride salt, and a borofluoride salt are preferable from the viewpoints of high safety, low manufacturing cost, and excellent setting properties.

Further, the low molecular amide compound of the present invention and /
Alternatively, the low molecular weight thioamide compound is not particularly limited,
It may be dissolved or dispersed in the solvent contained in the liquid quick-setting agent.

The low molecular weight in the present invention means a compound having a molecular weight of less than 10,000. That is, high molecular compounds such as polyamide resin fibers and polyacrylamide-based separation reducing agents that are used as fibers of ordinary spraying materials are excluded. Further, the molecular weight of the low-molecular amide compound and the low-molecular thioamide compound is preferably 50 to 2000 in view of solubility in a solvent and viscosity.

The low molecular weight amide compound is a general term for compounds having a structure in which one or more hydrogens of ammonia or amine are substituted with an acyl group or a sulfonic acid. Ie −CO
A sulfonamide compound containing an acid amide compound and -SO ₂ -NH- group containing an -NH- group, refers to one of the low molecular weight.
In addition, a compound that is easily converted into an amide compound in a normal use environment, for example, an amidine compound can be substantially regarded as an amide compound. On the other hand, the metal amide, which is named amide, is a special compound whose chemical properties are remarkably different from those of the low molecular weight amide compound and low molecular weight thioamide compound in the present invention. Cannot be used in inventions.

As the acid amide compound in the present invention,
Urea, acetamide, formamide, dimethylformamide (DMF), dimethylacetamide (DMAc), hexanamide, octanediamide, cyclohexanecarboxamide, ethanediamide, butanediamide, N-methylacetamide, benzanilide, cyclohexanecarboxyanilide, 2,4'-dichloroacetanilide, Acetohydroxamic acid, N-hydroxycyclohexanecarboxamide, bis (cyclohexanecarbonyl) azane, N-cyclopentyldiacetamide, N-acetyl-N- (3-chloropropanoyl) benzamide, succinamic acid, 3-
Examples include bromophthalamic acid, 2'-methoxysuccinanilide acid, and derivatives thereof.

Examples of the low-molecular-weight sulfonamide compound include amide sulfuric acid, benzenesulfonamide, methanesulfinamide, and derivatives thereof.

Examples of the amidine compound include acetamidine, benzamidine, and their derivatives. Since the amidine compound is extremely unstable in a solution and releases an imino group to become an amide compound, it can be substantially regarded as an amide compound when used in a solution system as in the present invention.

The low molecular weight thioamide compound is -CS
It is a general term for low molecular weight compounds having a —NH— group. Such compounds include thioacetamide, hexanethioamide, thiobenzamide, methanethiosulfonamide, thiourea, guanylurea salt, guanylthiourea, dialininourea, N, N-diphenylthiourea, dibutylthiourea, thiourea dioxide, And derivatives thereof and the like.

In the present invention, one kind or two or more kinds of the above-mentioned low molecular amide compound and low molecular thioamide compound can be used. In addition, as the low molecular amide compound and the low molecular thioamide compound in the present invention, acetamide, thioacetamide, and urea are preferable, and urea is more preferable.

The composition of the liquid quick-setting admixture was prepared from the setting property, suspension property, pumping property, etc., based on 100 parts of sulfur in terms of SO ₃ and aluminum in an amount of 25 to 25 in terms of Al ₂ O _3. 110
Parts, fluorine is 2.5 to 50 parts in terms of element, and the total amount of the low molecular amide compound and the low molecular thioamide compound is 1 to 50 parts. When sulfur, aluminum, and fluorine elements are contained in the low-molecular amide compound and the low-molecular thioamide compound, sulfur, Al _{2 in} terms of SO _{3 is} calculated from the blending amount of the low-molecular amide compound and the low-molecular thioamide compound.
The amount is obtained by subtracting aluminum in O ₃ conversion and fluorine in element conversion.

In the above formulation, when sulfur is not contained, the liquid quick-setting agent may have a high pH and become alkaline,
The content of aluminum or fluorine is less than the above blending amount,
Alternatively, if the total content of the low molecular amide compound and the low molecular thioamide compound is less than the above blending amount, sufficient coagulation properties may not be obtained, and the content of aluminum or fluorine exceeds the above blending amount, Alternatively, if the total content of the low-molecular amide compound and the low-molecular thioamide compound exceeds the above-mentioned blending amount, the fluidity may be lowered, and the pumping property may be lowered.

The composition for liquid quick-setting admixture is usually used as a liquid quick-setting admixture by mixing with a solvent. As the solvent, alcohols such as methanol, ethanol and isopropyl alcohol, glycols such as ethylene glycol, ketones such as acetone and methyl ethyl ketone, 1,4-
One or more kinds of various solvents such as ethers such as dioxane and tetrahydrofuran, aromatics such as toluene and xylene, water, and propylene carbide can be used.

Further, in the present invention, a solvent containing one or more of the three elements of sulfur, fluorine and aluminum as an element component may be used, and a liquid low molecular amide compound and a low molecular amide compound may be used. A thioamide compound may be used as a solvent.

That is, examples of the solvent containing sulfur include dimethyl sulfoxide (DMSO). Examples of the fluorine-containing solvent include Fluorinate, and examples of the low molecular weight amide compound include formamide, dimethylformamide (DMF), and dimethylacetamide (DMAc).

Of these solvents, low molecular amide compounds,
Low molecular weight thioamide compounds, alcohols, glycols, 1,4-dioxane, tetrohydrofuran, ketones,
It is preferable to use one or more water-soluble solvents such as amide compounds, nitrile compounds, and dimethyl sulfoxide (DMSO), or water, more preferably low-molecular amide compounds and low-molecular thioamide compounds.

The method of dissolving or dispersing the composition for the liquid quick-setting admixture in a solvent to obtain the liquid quick-setting admixture is not particularly limited, and the respective materials may be mixed simultaneously.
Part or all of them may be mixed in advance. Any existing device can be used as the mixing device, for example, a tilting mixer, an omni mixer, a Henschel mixer, a V-type mixer, a Nauta mixer,
And ball mills. Further, after the above-mentioned dissolution or dispersion treatment, the dispersion treatment may be further performed using an ultrasonic homogenizer or the like.

The liquid quick-setting admixture includes not only a solution form but also a suspension in which the active ingredient is present in a state of being dispersed in a liquid. The size of the suspended particles in the suspension is not particularly limited, but the average particle size is preferably 20 μm or less, more preferably 5 μm or less, from the viewpoint of dispersibility of the suspended particles.

In the liquid quick-setting admixture, the content of aluminum component in terms of Al ₂ O ₃ , the content of sulfur in terms of SO ₃ , and the content of fluorine component in terms of element, the content of low molecular amide compound, and The total content of the low molecular weight thioamide compound is preferably 10 to 60%, and more preferably 25 to 40% of the whole liquid quick-setting admixture. If the above total is less than 10%, an excellent coagulation property may not be obtained in some cases, and if it exceeds 60%, the viscosity of the liquid may be high and pumpability may be poor.

The composition for liquid quick-setting admixture may be added to cement concrete in a powder state. However, the composition for liquid quick-setting admixture may be dissolved or dispersed in a solvent or the like by the above-mentioned method. It is preferable to use it as a quick-setting admixture and mix it with cement concrete on site.

Further, the composition for a quick-setting admixture of the present invention can contain a Group 1A element. The 1A group element may be an element belonging to the 1A group on the periodic table. That is,
Refers to lithium, sodium, potassium, rubidium, and cesium. The radioactive element Francium is excluded. The form of the compound serving as a feed material for these elements is not particularly limited.

As the raw material for supplying the 1A group compound, fluorides, silicates, silicofluorides, alums, oxides, chlorides, hydroxides, nitrates, nitrites, phosphates and phosphorus of the 1A group elements are used. Acid monohydrogen salt, phosphoric acid dihydrogen salt, silicate, aluminate, sulfate, thiosulfate, sulfide, carbonate, bicarbonate, oxalate, and borate can be used. ,
One or more of these compounds can be used.

Of these salts, hydroxides, nitrites, phosphates, monohydrogen phosphates, dihydrogen phosphates, silicates, which have little effect on the reinforcing bars and steel frames normally used for concrete, Aluminate, thiosulfate, sulfide, carbonate,
Bicarbonates, oxalates, borates and the like are preferred.

Of the Group 1A elements, compounds containing lithium, sodium, and / or potassium, which are easily available, are preferable, and compounds containing sodium and / or potassium are more preferable from the viewpoint of economic efficiency, and they have good setting properties. Most preferred is potassium.

The amount of Group 1A element used is 100% sulfur.
With respect to parts, 2.5 to 50 parts are preferable, and 30 to 50 parts are more preferable in terms of oxide R ₂ O when the 1A group element is R. 2.5
If it is less than 50 parts, the effect of improving the coagulation property due to the addition of the Group 1A element is weak, and if it exceeds 50 parts, the pumpability of the liquid quick-setting admixture may deteriorate.

The liquid quick-setting admixture is preferably weakly alkaline to acidic, which has little effect on the human body.

In the present invention, a pH adjuster, a dispersant, a stabilizer, an antifreezing agent, a water-solubility promoter, an AE agent, a water reducing agent, an AE water reducing agent, a set retarder, a thickener, a fiber, and a fine powder are used. Additives can be used in combination within a range that does not substantially impair the object of the present invention.

The amount of the liquid quick-setting admixture used is preferably 2 to 15 parts per 100 parts of cement in terms of solid content. If the amount of the liquid quick-setting admixture used is less than 2 parts, excellent setting properties may not be exhibited, and if it exceeds 15 parts, long-term strength development may deteriorate.

When using the liquid quick-setting admixture, cement 100
It is preferred to use 25 to 70 parts of water for each part. 25 water
If it is less than 70 parts, the water content is insufficient and kneading cannot be carried out. If it exceeds 70 parts, so-called "Shabcon" is formed and sufficient strength is not exhibited. It should be noted that the amount of water contained in the aggregate, various additives, and the liquid quick-setting admixture should be taken into consideration when examining the composition.

The cement used in the present invention is not particularly limited, and in addition to various types of Portland cement such as normal, early strength, super early strength, moderate heat, and low heat, Portland cement can be used with blast furnace slag, fly ash, Any of various types of mixed cement in which silica and / or limestone fine powder are mixed can be used, and Portland cement is preferable and ordinary Portland cement is most preferable because of easy availability.

As the main spraying method, generally used wet spraying method and dry spraying method can be used. Examples of the wet method include a method of mixing the present quick-setting admixture with cement concrete, and the dry-type spraying method includes a method of mixing water and the present liquid quick-setting admixture with a composition of cement, sand, and gravel. Is mentioned.

As a method of mixing the liquid quick-setting admixture with cement concrete to form the main spraying material, it is preferable to use a Y-shaped tube or the like and mix it just before spraying. In particular,
It is preferable to add a liquid quick-setting agent to the cement concrete that has been pressure-fed, and to make the time until the spraying material is discharged within 10 seconds, more preferably within 2 seconds.

It is also possible to spray the sprayed material directly on the ground of the slope or at a location where the frame skeleton is arranged. Here, the frame skeleton is a combination of a wire mesh, a reinforcing bar, a steel frame and the like and is fixed to the wall surface, and the main spraying material is sprayed onto the frame skeleton to obtain a reinforcing concrete containing cement concrete frame.

[0065]

EXAMPLES The present invention will be described in more detail based on experimental examples.

Experimental Example 1 C / S (cement / sand ratio) = 1 / 2.5, W / C (water / cement ratio) = 45%
SL of mortar using polycarboxylic acid type water reducing agent
(Slump value) = about 18 cm, mix with 100 parts of cement in mortar, 10 parts of liquid quick-setting admixture having the composition shown in Table 1 and mix into a mold, and measure the proctor penetration resistance. The setting property was confirmed. The test environment temperature is 20 ° C. The results are also shown in Table 1.

<Materials used> The materials used were Wako Pure Chemical Industries, Ltd. first grade reagents unless otherwise noted. [Aluminum feedstock] A: Aluminum hydroxide,
B: Aluminum sulfate octahydrate [sulfur feedstock] B: Aluminum sulfate octahydrate,
C: Sulfuric acid (95% or more product, Wako Pure Chemical Industries), H: Guanazole sulfate [Fluorine feed material] D: Calcium fluoride, E: Sodium fluorosilicate [Low molecular amide compound and low molecular thioamide compound]
F: thioacetamide, G: urea [feeding material for Group 1A elements] H: potassium carbonate, I: aqueous sodium hydroxide: tap water liquid quick-setting agent: Calculate the above compounds to have the elemental composition shown in Table 1. Mixed. The liquid quick-setting admixture composition obtained by mixing and water were mixed by a ball mill in a mass ratio of 1: 1 and the mixture was stirred at 80 ° C. for 3 hours, and the obtained liquid was subjected to a test. Cement: Ordinary Portland cement, manufactured by Denki Kagaku Kogyo Co., Ltd., specific gravity 3.16 Sand: Niigata Prefecture Himekawa produced sand, specific gravity 2.62 Water reducing agent: Polycarboxylic acid high performance AE water reducing agent

<Measurement method> Proctor penetration resistance (setting property): In accordance with ASTM C 403 "Testing method for setting setting time of concrete by penetration resistance". The setting properties were evaluated for 1 minute, 3 minutes and 10 minutes after mixing the mortar and the quick-setting agent. Pumping performance: After mixing liquid quick-setting admixture for 72 hours at 20 ° C, hose 4 cm in diameter and 5 m long was filled with the liquid quick-setting admixture, and the pumping pressure was 0.5 MPa. The samples were rated as ◯, those that could be pumped but were unstable due to pulsation, etc. were marked as Δ, and those that were difficult to pump were rated as x.

[0069]

[Table 1] Note: The symbols in the pH column are A: less than pH2, B: pH2 ~ 6, C: more than pH6.

Experimental Example 2 A test was performed in the same manner as in Experimental Example 1 except that the liquid quick-setting admixture used in Experiment No. 1-22 was used and the liquid quick-setting admixture amounts shown in Table 2 were used. The results are shown in Table 2. The solid content of the liquid quick-setting admixture was about 40%.

[0071]

[Table 2]

Experimental Example 3 Unit cement amount 430 kg / m ³ , unit limestone amount 50 kg / m ³ , W / C
(Water / cement ratio) = 48%, and s / a (fine aggregate ratio) = 70% of concrete was prepared, and 1 part by volume of steel fiber (30 mm, specific gravity 7.85) was divided into 100 parts by volume of concrete. Then, a water reducing agent was further added to adjust SL (slump) = 20 cm. This concrete was pneumatically fed by a concrete feeding machine Aliver 280 type (manufactured by Aliver) at a feeding speed of 10 m ³ / hr and a feeding pressure of 0.4 MPa. The test environment temperature is
20 ° C.

Thereafter, with respect to 100 parts of cement, 10 parts of the liquid quick-setting admixture having the composition shown in Table 3 was pressure-fed by a pump, and a Y-tube attached 1 m in front of the discharge port was turned into concrete together with the pressure-fed air. It was press-fitted, mixed, and sprayed on the wall surface of a simulated tunnel with a height of 3 m, width of 3 m, and depth of 10 m as a spraying material.

The obtained sprayed materials were observed, and the results of examining the rebound rate and the presence or absence of deformation after spraying are also shown in Table 3.

<Materials used> Water reducing agent: Polycarboxylic acid type high performance AE water reducing agent

<Measurement Method> Deformation: After spraying on the wall surface of the simulated tunnel, the presence or absence of deformation was visually confirmed. The case where no deformation was observed after spraying was evaluated as ○, the case where there was some sagging but no problem in practical use was evaluated as Δ, and the case where the sagging was apparently made unusable as a spraying material was evaluated as ×. Rebound rate: Calculated by measuring the weight of concrete that has been sprayed and the weight of concrete that has rebounded.

[0077]

[Table 3]

[0078]

EFFECT OF THE INVENTION The composition for liquid quick-setting admixture, the liquid quick-setting admixture,
This quick-setting cement concrete and the spraying method using this can reduce the amount of dust at the time of spraying and the rebound rate compared with the powder quick-setting agent. It has the advantages that it is less in amount, and that it has better quantitative properties, better coagulation properties, and better pumpability than conventional liquid quick setting agents. The liquid quick-setting admixture of the present invention, a spraying material, and a spraying construction method using the same are a construction method of spraying cement concrete on an exposed ground surface in a tunnel such as a road, a railway, and a headrace, and a slope. Is effective for.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C04B 28/02 C04B 28/02 // C04B 103: 12 103: 12 (72) Inventor Seki Ishida Nishikubiki, Niigata Prefecture 2209 Aomi, Oomi-cho, Aomi-cho, Gunma Electric Chemical Industry Co., Ltd. Aomi Factory F-term (reference) 4G012 PB03 PB09 PB10 PB20 PC06 PE06

Claims (6)

[Claims] 1. Aluminum, sulfur, and fluorine 3
A composition for liquid quick-setting admixture comprising an elemental component and a low-molecular amide compound and / or a low-molecular thioamide compound as a compound component. 2. Amount of 25 to 110 parts of aluminum in terms of Al ₂ O ₃ and 100 parts of sulfur in terms of SO ₃ and fluorine in terms of element of 2.
The composition for liquid quick-setting admixture according to claim 1, which contains 5 to 50 parts, and further 1 to 50 parts of a low molecular amide compound and / or a low molecular thioamide compound. 3. A liquid quick-setting admixture containing the composition for liquid quick-setting admixture according to claim 1 or 2. 4. The total content of Al ₂ O ₃ -converted aluminum component, SO ₃ -converted sulfur component, element-converted fluorine component, low-molecular amide compound, and low-molecular thioamide compound is 10 to 10 in the liquid quick-setting admixture. The liquid quick-setting admixture according to claim 3, which is 60%. 5. A spray material containing the liquid quick-setting admixture according to claim 3 or claim 4 and cement concrete. 6. A spraying method using the spraying material according to claim 5.