JP6392554B2 - Liquid quick setting agent, quick setting cement concrete, and spraying method using the same - Google Patents

Description

  The present invention relates to, for example, a liquid quick setting agent used in the civil engineering / building industry, a quick setting cement concrete containing the same, and a spraying method using the same.

  In order to prevent the collapse of exposed ground such as tunnel excavation, a method for spraying fast-setting concrete in which a quick-setting agent is mixed with concrete is used. In this method, spray concrete is usually prepared at a cement, aggregate, and water metering plant installed at the excavation site, transported by an agitator car, pumped by a concrete pump, and a merging pipe provided in the middle Then, it is mixed with the rapid setting agent fed from the other side and sprayed to the ground surface as a quick setting sprayed concrete until a predetermined thickness is reached. As a spraying method, a method using a liquid accelerating agent mainly composed of aluminum sulfate is known.

JP 2005-89276 A JP 2006-193388 A Japanese Patent Laid-Open No. 2007-23706 JP 2002-226247 A

  As a method for improving the quick setting property of the liquid quick setting agent, there is a method of adding an alkali metal salt (Patent Document 1). In the addition of the alkali metal salt, the amount that can be added is limited in terms of the stability of the liquid, and it may be difficult to impart sufficient quick setting.

  As a method for ensuring the stability of the liquid, a method of mixing phosphorous acid and / or an organic acid salt thereof can be mentioned (Patent Document 2). However, Patent Document 2 does not describe that a naphthalene sulfonate-based dispersant is mixed to improve not only liquid stability (for example, storage stability) but also quick setting.

  Naphthalene sulfonate dispersant is generally used as a water reducing agent for concrete and mortar, and is added to the concrete and mortar side. The naphthalene sulfonate dispersant is intended to control fluidity.

  Patent Documents 3 to 4 describe that a naphthalenesulfonate formalin condensate may be added to an aqueous solution containing aluminum sulfate. However, Patent Document 3 has a description that it is preferable to use a naphthalene sulfonate formalin condensate added to the concrete side, but the addition of the naphthalene sulfonate formalin condensate to the liquid quickening agent side improves the quick setting property. There is no description.

  That is, the present invention is a liquid quick setting agent containing aluminum sulfate, naphthalene sulfonate-based dispersant and water, and containing 30 parts or more of aluminum sulfate in 100 parts of the liquid quick setting agent. Part, naphthalene sulfonate-based dispersant 0.02 to 5 parts, and water, and in 100 parts of liquid accelerator, a liquid accelerator containing 30 parts or more of aluminum sulfate, and a fluorine compound The liquid accelerator containing the alkanolamines, and further containing the compound having a hydroxyl group and / or the compound having a carboxylic acid. The liquid accelerator dispersed in a temperature range of −10 ° C. to 45 ° C., and the liquid accelerator set stored in a temperature range of −10 ° C. to 45 ° C. for 24 hours or more, Seme A rapid setting cement concrete containing the concrete and the liquid quick setting agent, and a spraying method in which the cement concrete and the liquid quick setting agent are mixed and sprayed. A spraying method in which the liquid quick-setting agent is mixed and sprayed for 24 hours or more in a temperature range of ˜45 ° C., and the liquid quick-setting agent is stored in a temperature range of −10 ° C. to 45 ° C. This is a method for storing a liquid quick-setting agent.

  By using the liquid quick setting agent of the present invention, for example, the following effects can be obtained. The liquid quick setting agent of the present invention is excellent in dispersion stability in a wide temperature range. Therefore, there is no trouble such as blockage during pumping, and it is possible to perform good spraying construction. Since the quick setting property of the liquid quick setting agent of the present invention is superior to that of the conventional quick setting agent, it is possible to perform spraying with little rebound and no flaking off.

  Hereinafter, the present invention will be described in detail. In the present invention, unless otherwise specified, parts and% refer to values in mass units. The cement concrete of the present invention is a general term for cement paste, mortar, and concrete.

  The liquid quick setting agent of the present invention contains aluminum sulfate, naphthalene sulfonate-based dispersant, and water. The liquid quick setting agent of the present invention includes a liquid quick setting agent in a suspended state.

  The aluminum sulfate of the present invention can be used without particular limitation as long as it is commercially available. Examples of aluminum sulfate include aluminum sulfate having crystal water such as anhydrous aluminum sulfate and aluminum sulfate 12 hydrate, and liquid aluminum sulfate that can be purchased in the form of an aqueous solution.

  In 100 parts of the liquid quick setting agent, the solid content concentration of aluminum sulfate is preferably 30 parts or more, more preferably 30 to 50 parts, from the viewpoint of quick setting or strength development of the quick setting cement concrete. 40 parts is most preferred. If it is less than 30 parts, the stability at low temperature may be lowered, and if it exceeds 50 parts, the storage stability may be lowered.

  The naphthalene sulfonate-based dispersant of the present invention refers to, for example, a formalin condensate of sodium naphthalene sulfonate. As the naphthalene sulfonate-based dispersant of the present invention, both powder and aqueous solution can be used, and commercially available ones can be used.

  By using the naphthalene sulfonate-based dispersant of the present invention, the solid content concentration of the liquid accelerator can be set to a value exceeding the solubility (27%) of aluminum sulfate. By using the naphthalene sulfonate dispersant of the present invention, when the liquid quick-setting agent is in a suspended state, the dispersion stability of the liquid quick-setting agent is improved, and the liquid quick-setting agent is used as cement concrete. When added to, it exhibits the effect of improving rapid setting and initial strength development. The following (1) and (2) can be considered as reasons why the effects of the present invention are exhibited when the naphthalene sulfonate-based dispersant is preliminarily mixed on the liquid accelerator side. When a naphthalene sulfonate-based dispersant is preliminarily mixed on the cement concrete side, these effects, particularly the effect of (1) cannot be obtained.

(1) Due to the dispersing effect of the naphthalene sulfonate dispersant, the particle diameter of the aluminum sulfate particles is reduced, and the reactivity is increased.
(2) A small amount of Na ₂ (SO ₄ ) ₃ is generated by the reaction of metal ions (Na ions) and sulfate ions on the naphthalene sulfonate dispersant side, and the sodium sulfate component develops strength after one day. improves.

  The amount of naphthalene sulfonate dispersant used is preferably 0.02 to 5 parts and more preferably 0.05 to 3 parts with respect to 100 parts of aluminum sulfate. If it is less than 0.02 part, the effect of improving dispersibility may be small, and if it exceeds 5 parts, strength development may be reduced. If the amount of naphthalene sulfonate dispersant used is within this range, the aluminum sulfate particles will be dispersed appropriately and become finer in the dispersion process, and the particle size will be reduced, resulting in higher reactivity and improved quick setting. It seems to do.

  Dispersion stability is an important performance when pumping a liquid quick-set agent from a tank during spraying. If the components in the liquid quick-set agent are separated and there is a large amount of sediment in the liquid quick-set agent, the pump may not be discharged from the tank. Even if the liquid quick-setting agent can be fed, the quality of the sprayed cement concrete may be affected because the concentration of the liquid quick-setting agent is not uniform. When the separation stability is evaluated by the degree of separation (the ratio of the supernatant liquid formed by suspended particles in the suspended liquid accelerator), it is preferably 10% or less, more preferably 5% or less, 3.0 % Is most preferred, 1.5% is more preferred, and 0% is even more preferred.

  The liquid quick setting agent of the present invention may contain a fluorine compound. The fluorine compound is used for the purpose of improving the setting property. The fluorine compound is not particularly limited as long as it is a compound that dissolves or decomposes in water. Examples of the fluorine compound include fluoride salts, silicofluoride salts, boron fluoride salts, organic fluorine compounds, and hydrofluoric acid. One or two or more of these can be used. Examples of the fluoride salt include lithium fluoride, sodium fluoride, potassium fluoride, calcium fluoride, aluminum fluoride, and cryolite. Cryolite contains sodium hexafluoroaluminate as a component, and any natural product or synthesized product can be used. Examples of the silicofluoride include ammonium silicofluoride, sodium silicofluoride, potassium silicofluoride, and magnesium silicofluoride. Boron fluoride salts include boron fluoride, boron trifluoride, boron trifluoride monoethylamine complex, boron trifluoride acetic acid complex, boron trifluoride triethanolamine, ammonium borofluoride, sodium borofluoride, potassium borofluoride , And ferrous borofluoride. One or two or more of these can be used. Among the fluorine compounds, cryolite is preferred because it is highly safe, has a low production cost, and has excellent setting properties.

  The amount of the fluorine compound used is preferably 0.2 to 10 parts, more preferably 0.7 to 7 parts, relative to 100 parts of aluminum sulfate. If it is less than 0.2 parts, the effect of improving the coagulation force may be small, and if it exceeds 10 parts, strength development may be inhibited.

  The liquid accelerator of the present invention may contain alkanolamines. Alkanolamines are used for the purpose of improving instantaneous cohesion when mixed with cement. The alkanolamines are not particularly limited, but can be used as long as they can be dissolved in the liquid accelerator. Alkanolamines are organic compounds having a> N—R—OH structure in the structural formula. Here, R is an atomic group usually called an alkyl group or an allyl group, a linear alkylene group such as a methylene group, an ethylene group or an n-propylene group, an alkylene group having a branched structure such as an isopropylene group, and the like. And an allyl group having an aromatic ring such as a phenyl group and a benzyl group. R may be bonded to the nitrogen atom at two or more positions, and a part or all of R may have a cyclic structure. R may be bonded to a plurality of hydroxyl groups. R may have an element other than carbon and an element other than hydrogen, such as sulfur, fluorine, chlorine, and oxygen, in part of the alkyl group. R may have a plurality of hydroxyl groups bonded thereto.

  Examples of alkanolamines include ethanolamine, diethanolamine, triethanolamine, N-methyldiethanolamine, N, N-dimethylethanolamine, N, N-dibutylethanolamine, N- (2-aminoethyl) ethanolamine, and trifluoride. Examples thereof include boron triethanolamine and derivatives thereof. One or two or more of these can be used.

Of the alkanolamines, diethanolamine is preferred in terms of stability during dissolution and coagulation properties.
The amount of alkanolamines used is preferably 0.2 to 10 parts, more preferably 0.7 to 7 parts, per 100 parts of aluminum sulfate. If it is less than 0.2 part, the instantaneous cohesive force may be little improved, and if it exceeds 10 part, strength development may be reduced.

  The liquid accelerator of the present invention may contain a compound having a hydroxyl group and / or a carboxylic acid. The compound having a hydroxyl group and / or carboxylic acid contributes somewhat to the dispersion stabilization of the liquid, but is used for the purpose of improving the strength after one day. Examples of the compound having a hydroxyl group include low molecular compounds such as glycerin, ethylene glycol, and propylene glycol, polyoxyethylene alkyl ethers or derivatives thereof. Among the compounds having a hydroxyl group, glycerin is preferable.

  Carboxylic acids refer to carboxylic acids and / or carboxylates. Examples of carboxylic acids include monocarboxylic acids such as formic acid, acetic acid, and propionic acid, dicarboxylic acids such as oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, maleic acid, fumaric acid, and phthalic acid, Tricarboxylic acids such as trimellitic acid and tricarballylic acid, oxymonocarboxylic acids such as hydroxybutyric acid, lactic acid, and salicylic acid, oxydicarboxylic acids of malic acid, aminocarboxylic acids such as aspartic acid and glutamic acid, ethylenediaminetetraacetic acid (EDTA) and Examples include aminopolycarboxylic acids such as trans-1,2-diaminocyclohexanetetraacetic acid (CyDTA). Examples of the salt constituting the carboxylate include alkali metals and alkaline earth metals. One or two or more of these can be used. Among the carboxylic acids, oxalic acid is preferable because it is easily available and inexpensive.

  The amount of the hydroxyl group-containing compound and / or carboxylic acid used is preferably 0.2 to 5 parts, more preferably 0.5 to 3 parts, relative to 100 parts of aluminum sulfate. If it is less than 0.2 part, it may be difficult to obtain the intended effect, and if it exceeds 5 parts, the coagulation force may be reduced.

  The liquid accelerating agent of the present invention is preferably stably dissolved or suspended in a temperature range of −10 ° C. to 45 ° C.

  The amount of the liquid setting agent of the present invention is preferably 0.5 to 15 parts, more preferably 3 to 10 parts in terms of solid content with respect to 100 parts of cement. If the amount is less than 0.5 part, it may be difficult to obtain sufficient quick setting properties. If the amount exceeds 15 parts, the amount of water in the cement concrete may increase and the strength development may decrease.

  The cement of the present invention is not particularly limited, and a commercially available cement can be used. As cement, various portland cements such as normal, early strength, super early strength, moderate heat, and low heat, various mixed cements mixed with blast furnace slag, fly ash, silica fume, blast furnace chilled slag and limestone fine powder. Examples include filler cement mixed with powder, and environmentally friendly cement (eco-cement) manufactured using municipal waste incineration ash and sewage sludge incineration ash as raw materials. Finely pulverized cement obtained by pulverizing these can also be used. The ratio of the mixture and cement in the mixed cement is not particularly limited.

  The present invention can be used as cement concrete by mixing cement such as fine aggregate such as sand or coarse aggregate such as gravel with cement. The aggregate is not particularly limited, and natural aggregate, artificially produced aggregate, heavy aggregate, recycled aggregate, or the like can be used.

  In the present invention, water reducing agents may be used on the cement concrete side. Examples of water reducing agents include water reducing agents, AE water reducing agents, high performance water reducing agents, and high performance AE water reducing agents. Examples of water reducing agents include alkylallyl sulfonic acid, naphthalene sulfonic acid, melamine sulfonic acid, lignin sulfonic acid, polycarboxylic acid, and polyethylene glycol. The water reducing agent can be either liquid or powdery. In these, a high performance water reducing agent is preferable.

  The amount of the water reducing agent used is preferably 0.05 to 5 parts by weight, more preferably 0.1 to 3 parts by weight in terms of solid content, with respect to 100 parts by weight of cement.

  As long as the object of the present invention is not substantially inhibited, fluidity retention agent, fiber, antifreeze agent, shrinkage reducing agent, rust preventive agent, clay mineral, retarder, polymer dispersion, expansion material, high strength admixture, coloring A cement admixture such as an agent, an AE agent, a dust reducing agent, a thickener, a waterproofing agent, and an efflorescence prevention agent can be used in combination.

  30-75% is preferable and, as for the water cement ratio of the cement concrete of this invention, 35-65% is more preferable.

  As the spraying method of the present invention, a wet spraying method and a dry spraying method which are generally performed can be applied. Examples of the wet construction method include a method of mixing the liquid quick-setting agent of the present invention with cement concrete mixed with cement, aggregate, and water. Examples of the dry construction method include a method in which water and the liquid quick setting agent of the present invention are mixed with cement concrete in which cement and aggregate are mixed, or only the liquid quick setting agent of the present invention is mixed.

  As a method of mixing the liquid quick-setting agent of the present invention with cement concrete and using it as a spray material, the present invention can be used by using a shower ring tube or Y-shaped tube to which the liquid quick-setting agent of the present invention can be added in the form of a shower. A method of mixing the liquid quick-setting agent and cement concrete immediately before spraying is preferable. When the liquid quick-setting agent of the present invention is mixed with cement concrete, the liquid quick-setting agent may be added in the form of mist with compressed air in advance.

  The spraying material of the present invention can be used as a support member during construction of an underground structure typified by tunnel construction. The spray material of the present invention can also be used for the stabilization method of the slope that sprays directly on the slope of the natural ground, the stabilization method of the slope that sprays on the place where the frame skeleton is placed, and the repair of various concrete structures. .

  Hereinafter, it demonstrates in detail based on an Example. The gelation shown in the table means a state in which suspended particles are completely settled and remain without falling even when the container is turned upside down.

100 parts of aluminum sulfate, a naphthalene sulfonate dispersant of the amount shown in Table 1, and water were added, and the mixture was stirred at 20 ° C. for 5 minutes to prepare a liquid accelerating agent. The solid concentration of aluminum sulfate was 37%. After preparing the liquid accelerator, it was transferred to a glass container and sealed. Then, after storing for 3 months, the dispersion state was observed and the degree of separation was evaluated. The results are shown in Table 1.
As a comparative example, a composition not using a naphthalene sulfonate dispersant was also evaluated.

(Materials used)
Aluminum sulfate: powder, commercially available 12 hydrate, reagent primary naphthalenesulfonate-based dispersant: formalin condensate of sodium β-naphthalenesulfonate, trade name “Labelin” manufactured by Daiichi Kogyo Seiyaku

(Test method)
Dispersion state: After stirring, the liquid quick-setting agent was immediately transferred to a glass bottle with a scale of 100 cc, and the liquid state was observed from the next day. The state of the liquid was observed every week, the ratio of the volume of the liquid surface in the suspended state to the volume of the liquid surface (100 cc) was determined, and the separation state (degree of separation) was evaluated by the following formula. Observation was carried out for up to 3 months. The environmental temperature during storage is 20 ° C. If the degree of separation is 0%, the liquid quenching agent does not settle and maintains a good dispersion state. As the degree of separation increases, the dispersion stability of the liquid accelerator decreases.
(formula)
Degree of separation (%) = 100 − [(volume of liquid surface in suspension (cc) / 100 (cc)) × 100]

  The solid content concentration of aluminum sulfate was adjusted to the amount shown in Table 2, and the same procedure as in Example 1 was performed except that 0.3 part of a naphthalene sulfonate dispersant was added to 100 parts of aluminum sulfate. The results are shown in Table 2.

  The same procedure as in Example 1 was conducted except that 100 parts of aluminum sulfate, 0.3 part of a naphthalene sulfonate dispersant, and an amount of the fluorine compound shown in Table 3 were added. The results are shown in Table 3.

(Materials used)
Fluorine compound: Sodium hexafluoroaluminate, commercially available reagent grade 1

  The same procedure as in Example 1 was performed except that 100 parts of aluminum sulfate, 0.3 part of a naphthalene sulfonate dispersant, and the amount of alkanolamines shown in Table 4 were added. The results are shown in Table 4.

(Materials used)
Alkanolamines: Diethanolamine, commercially available reagent grade 1

  The same procedure as in Example 1 was carried out except that 100 parts of aluminum sulfate, 0.3 part of a naphthalene sulfonate-based dispersant, and a compound having a hydroxyl group and / or carboxylic acids in the amounts shown in Table 5 were added. The results are shown in Table 5.

(Materials used)
Compound having hydroxyl group: Glycerin, commercially available Reagent primary carboxylic acids: Oxalic acid, commercially available Reagent primary

  100 parts of aluminum sulfate, naphthalene sulfonate-based dispersant in the amount shown in Table 6, fluorine compound in the amount shown in Table 6, alkanolamines in the amount shown in Table 6, compounds having hydroxyl groups in the amount shown in Table 6, The same procedure as in Example 1 was performed except that the amount of carboxylic acids shown in Table 6 was added. The results are shown in Table 7.

The same procedure as in Example 1 was performed except that the liquid quick setting agent shown in Table 8 was used, the temperature condition during storage of the liquid quick setting agent was changed to the temperature shown in Table 8, and the dispersion state after 3 months was confirmed. The results are shown in Table 8.

1.0 part of 2100 g of sand, 700 g of cement, 315 g of water and a high-performance water reducing agent in terms of solid content were added to 100 parts of cement, and kneaded with a mortar mixer to prepare sprayed mortar. To this mortar, 8 parts of a liquid quick-setting agent having the composition shown in Table 9 was added in terms of solid content with respect to 100 parts of cement, and stirred at high speed for 10 seconds to prepare a quick-setting mortar. The quick setting mortar was evaluated for setting properties and mortar compressive strength. In the evaluation, a liquid quick-setting agent stored until the next day was used. The results are shown in Table 9.
For comparison, when naphthalene sulfonate-based dispersant is not added to the liquid accelerating agent side, but added to the mortar side so as to be 0.3 parts with respect to 100 parts of aluminum sulfate in the liquid accelerating agent. Was also evaluated (Experiment No. 7-17). The liquid quick-setting agent was 100 parts of aluminum sulfate, 0.3 part of naphthalene sulfonate-based dispersant, the rest was made of water, and the liquid quick-setting agent with a solid content concentration of aluminum sulfate of 37% was used. Experiment No. In No. 7-17, a liquid accelerator containing only aluminum sulfate and water and a solid content concentration of aluminum sulfate of 37% was used. However, since the liquid accelerator is gelled the next day, the liquid accelerator immediately after preparation is used. A binder was used.

(Materials used)
Sand: Crushed sand from Itoigawa, Niigata density 2.66g / cm ³
Cement: Commercial product, Portland cement Density 3.15 g / cm ³
Water: tap water high-performance water reducing agent: commercial product, polycarboxylic acid water reducing agent

(Test method)
Condensation property: Based on JSCE-D102, the time range to reach the first start and the time range to reach the end were measured in minutes (for example, when the first start time is 10-11, the first start time is 10 to 11 minutes) . The test temperature is 25 ° C. Mortar compressive strength: Compressive strength was measured according to JIS R5201. The test temperature is 25 ° C.

  The same procedure as in Example 8 was performed except that the amount of the liquid quick-setting agent shown in Table 10 in terms of solid content was added to 100 parts of cement. The results are shown in Table 10.

The unit quantity of each material cement 400 kg / ^{m 3,} fine aggregates 1058kg / ^{m 3,} the shotcrete was prepared as coarse aggregate 710 kg / ^{m 3,} water 200 kg / ^{m 3,} superplasticizer 4 kg / ^{m 3,} The sprayed concrete was pumped by a concrete pump “MKW-25SMT” (manufactured by Shintech Co., Ltd.) under conditions of a spraying pressure of 0.4 MPa and a spraying speed of 10 m ³ / h. Compressed air was introduced at a position 3 m behind from the mixing tube that joined the liquid quick-setting agent, and the concrete was conveyed by air. From one of the mixing tubes, the liquid quick setting agent in Table 11 previously misted with compressed air was mixed and mixed with cement concrete. In the evaluation, a liquid quick-setting agent stored until the next day was used. Eight holes (diameter 3 mm) are arranged at equal intervals on the circumference of the pipe that joins the liquid quick-set agent, and the liquid quick-set agent joins and mixes with the cement concrete in a shower-like manner. It is a method. The amount of liquid quenching agent that merged with compressed air was adjusted to 8 parts in terms of solid content with respect to 100 parts of cement. The concrete compressive strength and rebound rate were measured for this quick setting shot concrete. The results are shown in Table 11.

(Materials used)
Coarse aggregate: Gravel from Himekawa, Itoigawa City, Niigata Prefecture, surface dry condition, specific gravity 2.66, maximum dimension 10mm
Fine aggregate: Himekawa Sakegawa gravel, Itoigawa city, Niigata prefecture, surface dry condition, specific gravity 2.62

(Measuring method)
Concrete compressive strength: The compressive strength of 3 hours and 1 day of age is that the pin placed on the pull-out formwork 25cm wide x 25cm long is covered with quick setting spray concrete from the surface of the pullout formwork. The pin was pulled out from the back side, the pulling strength at that time was determined, and the compressive strength was calculated from the formula of (compressive strength) = (pullout strength) × 4 / (test specimen contact area). The compressive strength at the age of 28 days was determined by spraying rapidly setting sprayed concrete onto a formwork of width 50 cm x length 50 cm x thickness 20 cm. Measured and determined compressive strength.
Rebound rate: Quick setting shotcrete was sprayed on a simulated tunnel having a height of 3.5 m and a width of 2.5 m created in an arch shape with an iron plate at a pumping speed of 10 m ³ / h for 10 minutes. After that, (Rebound rate) = (Amount of quick setting sprayed concrete dropped without adhering to the simulated tunnel) / (Amount of quick setting shot concrete sprayed to the simulated tunnel) x 100 (%) did.

  By using the liquid accelerating agent of the present invention, when the liquid accelerating agent is in a suspended state, the dispersion stability is excellent in a wide temperature range. Therefore, there is no blockage trouble during pumping, and it is possible to perform good spraying construction. Since the present invention is excellent in quick setting properties, it is possible to perform spraying with less rebound and less peeling. Therefore, the present invention can realize cost reduction by shortening construction time and material loss, and can be applied in a wide range of fields such as tunnel construction, slope construction, repair construction, and the like.

  Conventionally, in order to give sufficient quick setting properties, when the concentration of aluminum sulfate in the liquid quick setting agent is increased, for example, when the solid content concentration of aluminum sulfate exceeds 27%, the solubility decreases, There was a risk of formation of sediment. Even if the liquid quick-setting agent is dissolved by heating, gelation may occur, and there is a problem in the stability of the liquid. The present invention solves these problems, and even when the solid content concentration of aluminum sulfate exceeds 27%, the stability of the liquid is improved. Even if the solid content concentration of aluminum sulfate exceeds 27%, the liquid quick setting agent of the present invention can be used after the next day (24 hours), can be used after one week, or can be used after three months. The liquid quick-setting agent of the present invention is excellent in quality retention even in a temperature range from -10 ° C. to 45 ° C. from a low temperature to a high temperature. If you need it, you can use it. The industrial applicability of the present invention is extremely large.

Claims (11)

This is a spraying method in which cement concrete and a liquid quick-setting agent stored for 24 hours or more are mixed and sprayed. The liquid quick-setting agent consists of 100 parts of aluminum sulfate and a naphthalene sulfonate dispersant 0.02- A spraying method containing 5 parts and water and containing 30 parts or more of aluminum sulfate in 100 parts of a liquid quick-setting agent. Cement concrete, a spraying method of spraying a mixture of a -10 ° C. to 45 ° C. quick-setting admixture ing liquid was stored for more than 24 hours at a temperature region of the liquid quick-setting admixture is, 100 parts of aluminum sulfate A spraying method comprising 0.02 to 5 parts of a naphthalene sulfonate dispersant and water, and 30 parts or more of aluminum sulfate in 100 parts of a liquid quick-setting agent. The spraying method according to claim 1 , wherein the liquid setting agent further contains a fluorine compound. The spraying method according to claim 1 , wherein the liquid setting agent further contains an alkanolamine. The spraying method according to claim 1 , wherein the liquid accelerator further contains a compound having a hydroxyl group and / or a compound having a carboxylic acid. The spraying method according to claim 1, wherein the degree of separation of the liquid quick setting agent is 10% or less. The spraying method according to claim 3, wherein the amount of the fluorine compound used is 0.2 to 10 parts with respect to 100 parts of aluminum sulfate . The spraying method according to claim 4, wherein the amount of alkanolamines used is 0.2 to 10 parts per 100 parts of aluminum sulfate . The spraying method according to claim 5, wherein the amount of the compound having a hydroxyl group and / or the compound having a carboxylic acid is 0.2 to 5 parts relative to 100 parts of aluminum sulfate. The amount of liquid setting agent used is 0.5 to 15 parts in terms of solid content with respect to 100 parts of cement, and further 0.05 to 5 parts by weight in terms of solid content with respect to 100 parts by weight of cement. The spraying method according to claim 1, wherein water reducing agents are used on the cement concrete side, and the water-cement ratio of the cement concrete is 30 to 75%. The spraying method according to claim 1, wherein 33 parts or more of aluminum sulfate is contained in 100 parts of the liquid quick setting agent.