WO2013088542A1 - Matière à pulvériser et procédé de pulvérisation l'utilisant - Google Patents

Matière à pulvériser et procédé de pulvérisation l'utilisant Download PDF

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WO2013088542A1
WO2013088542A1 PCT/JP2011/078975 JP2011078975W WO2013088542A1 WO 2013088542 A1 WO2013088542 A1 WO 2013088542A1 JP 2011078975 W JP2011078975 W JP 2011078975W WO 2013088542 A1 WO2013088542 A1 WO 2013088542A1
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Prior art keywords
parts
mass
mortar
spraying
dry mortar
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PCT/JP2011/078975
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English (en)
Japanese (ja)
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寺島　勲
荒木　昭俊
三島　俊一
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電気化学工業株式会社
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Priority to PCT/JP2011/078975 priority Critical patent/WO2013088542A1/fr
Publication of WO2013088542A1 publication Critical patent/WO2013088542A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/10—Accelerators; Activators
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00034—Physico-chemical characteristics of the mixtures
    • C04B2111/00146—Sprayable or pumpable mixtures
    • C04B2111/00155—Sprayable, i.e. concrete-like, materials able to be shaped by spraying instead of by casting, e.g. gunite

Definitions

  • the present invention relates to a cement-based spraying material and a spraying method using the same.
  • a small-sized waterway tunnel with a diameter of 2 to 5 m is often excavated by a tunnel boring machine (TBM), and shotcrete is used to stabilize the bedrock after excavation.
  • TBM tunnel boring machine
  • shotcrete is used to stabilize the bedrock after excavation.
  • a large construction machine is used and the concrete to be used must be carried from the outside of the mine, so that there is a problem that the working space and the concrete working time are restricted.
  • Patent Document 1 a spraying method (refer to Patent Document 1) that shortens the working time and improves the working environment by using a batch kneaded mortar and a quick hard material slurry containing calcium aluminate in combination.
  • a spray material with improved workability in a small section tunnel that can be excavated by TBM a spray material containing cement, aggregate with a maximum particle size of 2.5 mm, slaked lime-containing material, and alkali metal aluminate (patent) Document 2) has been proposed.
  • a quick-hard material slurry containing calcium aluminate was used, it was necessary to improve the setting properties immediately after spraying.
  • spray materials containing cement, aggregates with a maximum particle size of 2.5 mm, slaked lime-containing substances, and alkali metal aluminates use alkali metal aluminates, which can cause chemical injury to workers. It was necessary to give sufficient consideration to countermeasures. For this reason, workers have to wear full protective equipment when spraying, and there is a problem that workability is inferior. Furthermore, it was necessary to improve long-term strength development and durability.
  • a spraying material (see Patent Document 3) was developed with measures against chemical injury to workers and improvement in durability of long-term strength, but this material uses calcium aluminate with high hydration activity, In order to secure the material pumpability after kneading with water, hydration of calcium aluminate is suppressed by using a large amount of organic acid. However, in a low temperature environment, the influence of delay due to the organic acid is large, and it is impossible to spray thickly without obtaining excellent condensation properties, and the sprayed surface may peel off after spraying.
  • Non-Patent Document 1 Although development is performed to reduce the rebound of the spray material (see Non-Patent Document 1), further reduction in the construction cost is necessary from the viewpoint of reducing the construction cost and improving the construction speed. Further, a spray material (see Patent Document 4) containing an acid liquid quick-setting agent having improved performance and alkali metal carbonate and / or alkali metal phosphate-containing cement concrete, and an acid liquid quick-setting agent A spray material (see Patent Document 5) containing calcium aluminosilicate and calcium hydroxide quick-setting aid has been developed, but there are problems with workability and rebound rate, and workability is high. There is a need for high technology related to spray materials that reduce the rebound rate.
  • dry cement mortar made by mixing aggregate and cement is combined with a liquid quick-setting agent in the course of pumping wet mortar by a continuous mixing mixer, mixed and blown.
  • the spraying method to attach is proposed, there is no description about the composition of a calcium aluminosilicate and the composition of a liquid quick setting agent (refer patent document 6).
  • dry mortar containing calcium aluminosilicate, calcium sulfate, early strong cement, and aggregate having a maximum particle size of 1.2 mm or less was kneaded with a continuous mixer and pumped by adding an acidic liquid setting agent to the mortar.
  • the spraying method to attach is proposed, there is no description about the proper setting time of the mortar which added the quick setting agent, and the continuous supply system of material (refer patent document 7).
  • Japanese Patent Laid-Open No. 3-122040 Japanese Unexamined Patent Publication No. 9-227198 Japanese Unexamined Patent Publication No. 2000-1355 Japanese Unexamined Patent Publication No. 2005-35856 WO 01/60760 A1 WO 2005/019131 Japanese Unexamined Patent Publication No. 2008-254973
  • An object of the present invention is to provide a spray material having high safety to the human body, good material pumpability and less rebound, and a spray method using the same.
  • the present invention has the following features. 1. 100 parts by weight of cement, 2-8 parts by weight of calcium aluminosilicate, 1-12 parts by weight of gypsum, 4-8 parts by weight of calcium hydroxide, 0.05-0.3 parts by weight of water-soluble polymer, 100 parts by weight of dry mortar On the other hand, 0.2 to 1 part by volume of fibers and 100 to 10 parts by mass of dry mortar containing 100 to 10 parts by mass of aggregate having a maximum particle size of 1.2 mm or less in 100 parts by mass of dry mortar, 18 to 22 water.
  • the aggregate has a maximum particle size of 1.2 mm or less, and the ratio of the aggregate particle size (0.6 to 1.2 mm) / (less than 0.6 mm) is 20/80 to 70/30 in mass ratio.
  • R is an alkali metal
  • the acidic liquid accelerating agent contains 1 to 5 parts by mass as fluorine (F) in 100 parts by mass. 7). 7.
  • the dry mortar and water are kneaded using a continuous kneading mixer that continuously supplies water, and the kneaded mortar is pumped with a pump and then mixed with an acidic liquid quick-setting agent and sprayed just before spraying.
  • 9. 9 A spraying method using the spraying material according to 8 above, wherein the dry mortar is supplied from a hopper tank to a hopper upper portion of a continuous kneader by a screw conveyor. 10. 10.
  • the spraying method using the spraying material according to any one of the above 8 to 10 wherein the acidic liquid quick setting agent is pressed into air flowing into a hose having an inner diameter of 15 to 20 mm to be misted and mixed with kneaded mortar. . 12
  • the spraying material and the spraying method of the present invention it is possible to ensure a highly safe environment for workers even in spraying work in a narrow work space such as a small section tunnel.
  • the initial strength and long-term strength after spraying are high, the ground and rock after drilling can be stabilized even when the spraying thickness is 2 to 3 cm.
  • the use of a continuous mixer pump increases the work efficiency of spraying.
  • mortar means a mixture of cement-based materials such as cement, calcium aluminosilicate, gypsum, calcium hydroxide, water-soluble polymer, fiber, and aggregate with water. Mortar usually does not contain a quick set. Moreover, in this invention, dry mortar means the mortar which does not contain water.
  • the calcium aluminosilicate used in the present invention is a component that reacts with the acidic liquid quick-setting agent of the present invention and imparts quick setting properties in the initial stage.
  • Calcium aluminosilicate is obtained by mixing a raw material containing calcia, a raw material containing alumina, and a raw material containing silica, followed by heat treatment such as firing in a kiln or melting in an electric furnace, the main components of which are CaO—Al 2 O 3 —SiO 2 is a general term for substances having hydration activity.
  • this component is alkali metal oxide, alkaline earth metal oxide, titanium oxide, iron oxide, alkali metal halide, alkaline earth metal halide, alkali metal sulfate, alkaline earth metal sulfate, etc.
  • Substituted compounds can also be used.
  • the crystal structure may be either crystalline or amorphous, but it is preferable to use an amorphous one because high crystallinity is imparted.
  • the proportion of each component in 100 parts by mass of calcium aluminosilicate is preferably 40 to 50 parts by mass of CaO, more preferably 42 to 47 parts by mass, and preferably 35 to 45 parts by mass of Al 2 O 3 and more preferably 37. 42 parts by mass and SiO 2 are preferably 8-17 parts by mass, more preferably 10-15 parts by mass. If the proportion of each component is outside this range, when good coagulation properties are not obtained, hydration activity is increased, and the pot life of mortar after kneading with water is shortened, so the flow value of the mortar becomes low, The pumpability may deteriorate.
  • the calcium aluminosilicate may contain components other than CaO, Al 2 O 3 , and SiO 2 in 100 parts by mass of calcium aluminosilicate in an amount of 7 parts by mass or less, and may further contain 6 parts by mass or less.
  • the particle size of the calcium aluminosilicate preferably 4000 cm 2 / g or more in Blaine value, more preferably 4500 ⁇ 6500cm 2 / g. When the brain value is less than 4000 cm 2 / g, rapid setting and initial strength development may be deteriorated.
  • the amount of calcium aluminosilicate used is preferably 2 to 8 parts by mass and more preferably 3 to 6 parts by mass with respect to 100 parts by mass of cement in terms of workability, initial strength development, and durability. If it is less than 2 parts by mass, the cohesive strength and strength development may be reduced, and if it exceeds 8 parts by mass, it is difficult to ensure the pot life of the mortar and durability may not be obtained.
  • gypsum examples include anhydrous gypsum, hemihydrate gypsum, dihydrate gypsum, and the like, and one or more selected from these can be used.
  • Anhydrite includes hydrofluoric acid by-product anhydrous gypsum and natural anhydrous gypsum. Of these, anhydrous gypsum is preferably used because of its excellent strength development.
  • the particle size of gypsum is preferably 4000 cm 2 / g or more and more preferably 4500 to 6500 cm 2 / g in terms of brain value from the viewpoint of initial strength development.
  • the amount of gypsum used is not particularly limited, but is preferably 1 to 12 parts by weight, more preferably 2 to 8 parts by weight, based on 100 parts by weight of cement. If the amount is less than 1 part by mass, excellent strength developability may not be obtained. If the amount exceeds 12 parts by mass, it may expand excessively and the strength may decrease.
  • the cement used in the present invention is not particularly limited, and various portland cements such as normal, early strength, very early strength, moderate heat, or low heat, and blast furnace slag, fly ash, and / or these portland cements. Alternatively, any of various mixed cements mixed with limestone fine powder can be used.
  • the amount of cement used is not particularly limited, but is preferably 30 to 50 parts by mass, more preferably 30 to 40 parts by mass in 100 parts by mass of dry mortar from the viewpoint of initial strength development and mortar pumpability.
  • the aggregate used in the present invention is used to improve the durability of the sprayed mortar and the mortar pumpability.
  • the kind of aggregate is not particularly limited, and any of natural sand, quartz sand, and / or lime sand can be used.
  • lime sand from the viewpoint of durability of the cured body.
  • the amount of aggregate used is preferably 50 to 70 parts by mass, more preferably 55 to 65 parts by mass in 100 parts by mass of dry mortar. Outside this range, the mortar pumpability and the durability of the cured product may be reduced.
  • the maximum particle size of the aggregate is 1.2 mm or less, preferably 0.005 to 1.0 mm, from the viewpoint of improving the pumpability of the mortar and reducing the rebound of the sprayed mortar.
  • the particle size constitution of the aggregate is not particularly limited, but the ratio of the aggregate particle size (0.6 to 1.2 mm) / (less than 0.6 mm) is 20/80 to 70 / in mass ratio. 30 is preferable, and 25/75 to 40/60 is more preferable. Outside this range, excellent mortar pumpability may not be obtained.
  • the acidic liquid accelerator used in the present invention reacts with cement or calcium aluminosilicate, and is used for promoting initial setting and improving strength development.
  • the acidic liquid accelerating agent contains an aluminum component and a sulfur component as main components and contains an alkali metal element or fluorine as an essential component.
  • the acidic liquid quencher may contain both alkali metal elements and fluorine.
  • the feedstock of the aluminum component is not particularly limited, but there are amorphous or crystalline aluminum hydroxide, inorganic aluminum compounds such as aluminum sulfate, aluminate, organic aluminum compounds, aluminum complexes, and the like. One or two or more selected from these can be used. In the present invention, the use of aluminum sulfate, which is also a sulfur component feedstock, is preferred.
  • the feedstock of the sulfur component is not particularly limited, but in addition to elemental sulfur such as sulfur and sulfur white, sulfide, sulfuric acid or sulfate, sulfite or sulfite, thiosulfuric acid or thiosulfate, An organic sulfur compound etc.
  • the 1 type (s) or 2 or more types selected from these can be used.
  • sulfuric acid or sulfate is preferred from the viewpoints of high solubility in water, low production cost, and excellent quick setting properties.
  • alum and aluminum sulfate are preferred.
  • the feedstock of the alkali metal element is not particularly limited, but is not particularly limited as long as it is a water-soluble compound containing an alkali metal element, that is, lithium, sodium or potassium.
  • sulfates, bicarbonates, oxalates, fluorides, silicofluorides, and alums of alkali metal elements are preferable.
  • the raw material for supplying elemental fluorine is not particularly limited as long as it is a compound that dissolves or disperses in water.
  • Fluorine compounds such as fluoride, silicofluoride, boron fluoride salt, organic fluorine compound, and hydrofluoric acid One or two or more selected from these can be used.
  • fluoride and silicofluoride are preferable from the viewpoints of high safety, low production cost, and excellent coagulation properties.
  • the amount of the alkali metal element used is preferably 1 to 5 parts by mass and more preferably 2 to 4 parts by mass in terms of R 2 O (R represents an alkali metal) in 100 parts by mass of the acidic liquid accelerating agent.
  • the content of fluorine is preferably 1 to 5 parts by mass, and more preferably 2 to 4 parts by mass as fluorine (F) in 100 parts by mass of the acidic liquid accelerating agent. If it is less than 1 part by mass, excellent quick setting may not be obtained, and if it exceeds 5 parts by mass, strength development may be inhibited.
  • the acidic liquid quick-setting agent of the present invention can further contain an alkanolamine or a stabilizer.
  • An alkanolamine is an organic compound having an N—C—OH structure in the structural formula.
  • C is an atomic group called an alkyl group or an allyl group, for example, a linear alkyl group such as a methylene group, an ethylene group or an N-propylene group, an alkyl group having a branched structure such as an isopropyl group, a phenyl group, And an allyl group having an aromatic ring such as a benzyl group and the like.
  • C may be bonded to the nitrogen atom at two or more locations, and a part or all of C may have a cyclic structure.
  • C may be bonded to a plurality of hydroxyl groups, and an element other than carbon or hydrogen, for example, sulfur, fluorine, chlorine, oxygen, or the like may be included in a part of the alkyl group.
  • an element other than carbon or hydrogen for example, sulfur, fluorine, chlorine, oxygen, or the like may be included in a part of the alkyl group.
  • diethanolamine and / or N, N-dimethylethanolamine is preferably used.
  • the acidic liquid quick-setting agent of the present invention can contain an organic acid as a stabilizer for the purpose of improving storage stability.
  • the stabilizer include oxalic acid, malonic acid, succinic acid, formic acid, citric acid, phosphoric acids, or salts thereof, and one or more selected from these can be used.
  • the acidic liquid accelerating agent can be used from a completely solution to a suspension of each component.
  • the acidic liquid accelerating agent may have an acidic pH, preferably 2 to 4, and more preferably 2 to 3. If the pH is less than 2, excellent strength developability may not be obtained, and if the pH exceeds 4, the stability of the liquid quick-setting agent may be deteriorated.
  • the solid content concentration of the acidic liquid accelerator is preferably 25 to 70%, more preferably 30 to 60%. If it is less than 25%, an excellent setting property may not be obtained, and if it exceeds 70%, the stability of the liquid may be deteriorated.
  • the Al 2 O 3 / SO 3 molar ratio in the acidic liquid quenching agent is not particularly limited, but is preferably 0.2 to 0.6, more preferably 0.3 to 0.5. If the molar ratio is out of this range, an excellent setting property may not be obtained.
  • the use amount of the acidic liquid accelerating agent is preferably 2 to 8 parts by mass and more preferably 4 to 6 parts by mass with respect to 100 parts by mass of the dry mortar. If the amount is less than 2 parts by mass, an excellent quick setting property may not be obtained. If the amount exceeds 8 parts by mass, the durability of the cured body may decrease.
  • fibers can be used to improve durability.
  • the fiber include inorganic fibers such as ceramic fibers, alkali-resistant glass fibers, and carbon fibers; organic fibers such as polyethylene fibers, vinylon fibers, aramid fibers, and polyacryl fibers; and steel fibers such as steel fibers. .
  • it is selected from the group consisting of alkali-resistant glass fiber, carbon fiber, polyethylene fiber, vinylon fiber and polyacrylic fiber in terms of the mixability and workability of dry mortar in which cement and aggregate are mixed by a dry method.
  • the use of one or more fibers is preferred.
  • the length of the fiber is preferably 6 to 12 mm, and more preferably 6 to 10 mm, from the inner diameter of the mortar pressure hose.
  • the fiber thickness is preferably 0.05 to 0.5 mm, more preferably 0.1 to 0.3 mm.
  • the amount of fiber used is preferably 0.2 to 1 part by volume, more preferably 0.3 to 0.8 part by volume with respect to 100 parts by volume of dry mortar. If the amount is less than 0.2 part by volume, the intended strength may not be obtained. If the amount exceeds 1 part by volume, the mixing and dispersibility during mortar mixing may be deteriorated, or the strength may be deteriorated.
  • the spraying material of the present invention can further improve initial adhesion by further containing calcium hydroxide.
  • the calcium hydroxide used in the present invention includes slaked lime generated when quick lime and carbide are hydrated. Due to the property that concrete uses water, it reacts with water to generate a large amount of calcium hydroxide. Etc. can be used.
  • the amount of calcium hydroxide used is preferably 4 to 8 parts by mass and more preferably 5 to 7 parts by mass with respect to 100 parts by mass of cement. If the amount used is less than 4 parts by mass, good adhesion may not be obtained, and if it exceeds 8 parts by mass, excellent strength development may not be obtained.
  • the spray material of the present invention can further contain a water-soluble polymer.
  • the water-soluble polymer refers to a polymer that gives viscosity to mortar, prevents dripping immediately after spraying, reduces the rebound rate, and suppresses dust generation.
  • water-soluble polymers include celluloses such as methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxyethyl methyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl ethyl cellulose; alginic acid, sodium alginate, ⁇ -1,3 glucan, pullulan, guar gum, Polysaccharides such as casein and welan gum; vinyl polymers such as vinyl acetate, vinyl chloride, methacrylic acid, acrylic acid, sodium acrylate, unsaturated carboxylic acids, and copolymers thereof; vinyl acetate polymers and copolymers thereof Emulsions such as those saponified and modified into
  • the amount of the water-soluble polymer used is preferably 0.05 to 0.3 parts by mass, more preferably 0.1 to 0.2 parts by mass with respect to 100 parts by mass of cement. If it is less than 0.05 parts by mass, the pumpability of the mortar may decrease and the pumping pressure may increase, and if it exceeds 0.3 parts by mass, the viscosity of the mortar will increase. May increase and strength development may decrease.
  • the spray material of the present invention further suppresses the reaction of calcium aluminosilicate, and in order to ensure material pumpability after kneading with water, a hydroxylate containing a Group 1 element of the periodic table (hereinafter referred to as hydroxyl group). Acid salt)).
  • hydroxyl group a hydroxylate containing a Group 1 element of the periodic table
  • Acid salt a hydroxylate containing a Group 1 element of the periodic table
  • the hydroxyl acid salt used in the present invention include citrate, gluconate, tartrate, malate and the like, and one or more selected from these can be used. Of these, sodium citrate, sodium gluconate, sodium tartrate and the like are particularly preferable.
  • the amount of the hydroxyl acid salt used is preferably 0.005 to 0.3 parts by mass, more preferably 0.01 to 0.2 parts by mass with respect to 100 parts by mass of cement. If the amount is less than 0.005 parts by mass, the fluidity of the target material may not be obtained. If the amount exceeds 0.3 parts by mass, the setting properties may be reduced and the initial strength may be reduced. .
  • the water reducing agent is generally used to improve the fluidity of cement concrete and the dispersion stability of the quick setting material, and the water reducing agent can also be used in the spray material of the present invention.
  • the water reducing agent either liquid or powdery can be used.
  • the water reducing agent include polyol derivatives, lignin sulfonates or derivatives thereof, and high performance water reducing agents, and one or more selected from these can be used.
  • a high-performance water reducing agent is preferable in terms of high strength expression and dispersion stability.
  • high-performance water reducing agents examples include formalin condensates of alkyl allyl sulfonates, formalin condensates of naphthalene sulfonates, formalin condensates of melamine sulfonates, polycarboxylic acid polymer compounds, and the like. Any one of these states can be used, and one or more selected from these can be used. In these, the formalin condensate of naphthalene sulfonate, the formalin condensate of melamine sulfonate, or a polycarboxylic acid polymer compound is preferable in that the above effect is great.
  • a setting retarder such as phosphate, boric acid or a salt thereof, or alcohols
  • You may use ultrafine powder with an average particle diameter of 10 micrometers or less, such as fine powder slag, fine powder fly ash, bentonite, metakaorion, and silica fume.
  • Alkali metal carbonates may be used to improve the setting properties of the acidic liquid quenching agent.
  • water is added to the above-mentioned dry mortar containing cement, calcium aluminosilicate, gypsum, calcium hydroxide, water-soluble polymer, fiber, aggregate and the like, kneaded, and the obtained mortar
  • the acidic liquid quick setting agent is individually pumped and mixed and sprayed immediately before spraying.
  • the term “immediately before spraying” is preferably 30 cm or less, more preferably 20 to 30 cm from the tip of the spray nozzle.
  • a continuous kneading mixer that continuously supplies water to dry mortar is kneaded, the kneaded mortar is pumped, and the acidic liquid quick setting agent is hose at the joint between the spray nozzle and the pumping hose. It is desirable to add and spray from the periphery, especially from the entire periphery.
  • the amount of water used for kneading is 170 to 250 mm in flow value (measured by a method according to JIS R5201-1998) so as to obtain fluidity that can be pumped with a pump, more preferably 180 to 250 mm. It is preferable to add 18 to 22 parts by weight, preferably 19 to 21 parts by weight of water with respect to 100 parts by weight of dry mortar so as to be 220 mm. If the flow value is 170 mm or less, the pumping pressure may increase and the hose may be blocked. If the flow value is 250 mm or more, the condensation property may be weak and rebound may increase.
  • a pump such as a piston pump, a squeeze pump, or a snake pump can be used.
  • the supplied spray material is kneaded with water press-fitted with a blade at the tip of the mixer and continuously pumped with a snake pump connected thereto.
  • a method of kneading and pumping with a kneading and pumping device is preferable in terms of workability.
  • a method for supplying dry mortar a method in which the dry mortar is manually supplied to the upper part of the hopper of the continuous kneading and feeding apparatus (included in the continuous kneading mixer pump 3 in the figure) is generally used.
  • a method of supplying dry mortar to the hopper tank 1 and supplying the dry mortar from the hopper tank 1 to the hopper of the continuous kneading and pressure feeding device with the screw conveyor 2 is preferable from the viewpoint of workability (FIG. 1). Fall under).
  • dry mortar is separately supplied to the primary hopper tank 8, and the upper hopper of the continuous kneading and pressure feeding device is passed from the primary hopper tank 8 via the screw conveyor 2 ′, the hopper tank 1, and the screw conveyor 2. Is preferable from the viewpoint of workability (corresponding to FIG. 2).
  • a method of supplying dry mortar to the hopper tank a method of supplying from a flexible container bag is generally used, but a method of supplying from another primary hopper tank 8 by a screw conveyor 2 ′ is preferable in terms of workability.
  • a method of supplying dry mortar from another primary hopper tank 8 to the hopper tank 1 by pneumatic transportation is also preferable in terms of workability.
  • the pneumatic transport hose 9 is used (corresponding to FIG. 3).
  • the primary hopper tank a stationary silo or a mobile tank can be cited, and it is preferable to select the primary hopper tank according to construction conditions.
  • the inner diameter of the mortar pressure hose is preferably 25 to 32 mm, more preferably 32 mm. If it is less than 25 mm, the pumping pressure becomes high, so the pumping distance may not be 10 m or more. If it exceeds 32 mm, a lot of mortar is discarded when the hose is washed. It is not preferable also from a point. If the inner diameter of the pressure hose is 25 to 32 mm, it can be fed by 50 m.
  • the pump for pumping the acidic liquid quick setting agent is not particularly limited, and a piston pump, a squeeze pump, a snake pump, a plunger pump, or the like can be used.
  • the method of mixing the kneaded and pressure-fed mortar with the acidic liquid accelerating agent is a method of adding just before spraying, and immediately before spraying includes the following methods. That is, using an Y-shaped tube, an acidic liquid quick-setting agent can be press-fitted into the spraying air to form a mist, which can be conveyed and sprayed.
  • the conveyance hose is an inner diameter of 15 to 20 mm, more preferably 20 mm.
  • the position where the acidic liquid quick-setting agent is added is not particularly limited, but the position close to the mortar pressure feeding hose can be shared with the blowing air hose. Therefore, it is preferable.
  • an inlet piece having several holes around the ring is press-fitted with air containing an acidic liquid quenching agent, mixed with mortar, and sprayed.
  • the discharge amount of mortar is preferable to below 3m 3 / hr, 2m 3 / hr or less is more preferable.
  • blowing air volume is preferably 0.5 ⁇ 2m 3 / min, more preferably 0.7 ⁇ 1.0m 3 / min. If it is less than 0.5 m 3 / min, a smooth finish cannot be obtained, and the pumping pressure may increase and may be blocked by the spray nozzle. If it exceeds 2 m 3 / min, dust will increase and rebound (rebound) will also increase.
  • the initial setting time at 20 ° C. is within 5 minutes, preferably within 1 minute, and the final time is within 30 minutes, preferably within 10 minutes.
  • Example 1 100 parts by mass of cement, calcium aluminosilicate (CAS) in the amount shown in Table 1, gypsum in the amount shown in Table 1, calcium hydroxide in the amount shown in Table 1, 0.1 part by mass of water-soluble polymer, dry mortar obtained 100 parts by volume of fiber A or fiber B 0.7 part by volume (multiplying the volume of the fiber by the density of the fiber to make a mass measurement), and 100 parts by weight of the resulting dry mortar, 60 parts by weight of the aggregate Dry mortar was prepared. Next, 20 parts by mass of water was added to 100 parts by mass of the dry mortar, and kneaded with a mortar mixer according to JIS-R5201, to prepare a mortar, and the flow value was measured.
  • CAS calcium aluminosilicate
  • Table 1 shows the composition of the mortar and the measurement results.
  • Gypsum B hemihydrate gypsum, brain value 4800 cm 2 / g.
  • Calcium hydroxide commercial product
  • Water-soluble polymer methyl cellulose, commercially available product.
  • Fiber A Vinylon fiber (trade name RF400, manufactured by Kuraray Co., Ltd.), thickness 0.2 ⁇ m, length 6 mm, density 1.3 g / cm 3 .
  • Mortar flow value Measured according to JIS-R5201. Initial time: The time required for the proctor penetration resistance value to reach 3.5 N / mm 2 was measured. Termination time: The time required for the proctor penetration resistance value to reach 28 N / mm 2 was measured. Compressive strength: Measured according to JIS-R5201 at 20 ° C. and a predetermined age. Mortar pot life: After the dry mortar and water were added to prepare the mortar, the time until the mortar flow value reached 160 mm or less was measured.
  • Example 2 100 parts by mass of cement, the ratio of CaO / Al 2 O 3 and the content of other components of 6% are the same, 5 parts by mass of calcium aluminosilicate containing the amount of SiO 2 shown in Table 2, 5 parts by mass of anhydrous gypsum, hydroxylation 6 parts by mass of calcium, 0.1 part by mass of water-soluble polymer, 0.7 parts by mass of fiber A with respect to 100 parts by mass of dry mortar obtained, and 60 parts by mass of aggregate in 100 parts by mass of dry mortar to be obtained A dry mortar was prepared.
  • the raw material components described above were the same as those used in Examples 1-4.
  • Calcium aluminosilicate is the same as 1-4 in Experimental Example 1 except for the amount of SiO 2 . Subsequently, it carried out similarly to Experimental example 1 except having added 20 mass parts of water with respect to 100 mass parts of this dry mortar, and preparing mortar. The results are shown in Table 2.
  • Example 3 100 parts by weight of cement, 5 parts by weight of calcium aluminosilicate, 5 parts by weight of anhydrous gypsum, 6 parts by weight of calcium hydroxide, 0.1 part by weight of water-soluble polymer, and 0.7 volume of fiber with respect to 100 parts by weight of the resulting dry mortar
  • the dry mortar was prepared by blending 60 parts by mass of the aggregate with 100 parts by mass of the obtained dry mortar.
  • the raw material components described above were the same as those used in Examples 1-4.
  • Calcium aluminosilicate is the same as 1-4 in Experimental Example 1 except for the amount of SiO 2 .
  • 20 parts by mass of water was added to 100 parts by mass of the dry mortar to prepare a mortar.
  • Table 4 shows 100 parts by mass of cement, 5 parts by mass of calcium aluminosilicate, 5 parts by mass of anhydrous gypsum, 6 parts by mass of calcium hydroxide, and the water-soluble polymer in the amount shown in Table 4, and 100 parts by volume of the resulting dry mortar.
  • An amount of fiber A and 60 parts by mass of aggregate in 100 parts by mass of the obtained dry mortar were mixed using a Nauter mixer to produce a dry mortar.
  • the produced dry mortar is put into a G4 continuous mixer pump (manufactured by PFT, Germany), 20 parts by mass of water is added to 100 parts by mass of the dry mortar, and the mixture is continuously kneaded with a capacity of 2 m 3 / hr. Pumped.
  • the specifications of the pressure feeding hose were hose inner diameter: 32 mm and hose length 30 m.
  • the acidic liquid suddenly used in Experimental Example 1 was used from a Y-shaped tube attached to the rear of the spray nozzle to a hose with an inner diameter of 20 mm that pumps spray air with an air pressure of 0.35 MPa and a spray air amount of 1 m 3 / min.
  • the binder was press-fitted with a plunger pump.
  • a mixture of an acidic liquid quick-setting agent and air was added to a mortar from an inlet piece attached 20 cm before the tip of the spray nozzle to obtain a spray material.
  • the acidic liquid quick-setting agent was added so as to be 5 parts by mass with respect to 100 parts by mass of dry mortar. The results are shown in Table 4.
  • Fiber A Vinylon fiber length 6 mm, manufactured by Kuraray.
  • Water-soluble polymer methyl cellulose, commercially available product.
  • Example 5 100 parts by weight of cement, 5 parts by weight of calcium aluminosilicate, 5 parts by weight of anhydrous gypsum, 6 parts by weight of calcium hydroxide, 0.1 part by weight of water-soluble polymer, 0.5 volume of fiber to 100 parts by weight of the resulting dry mortar 60 parts by mass of aggregate in 100 parts by mass of dry mortar and the resulting dry mortar were mixed using a Nauta mixer to produce dry mortar.
  • each raw material component all used the same thing as described in Experimental example 4.
  • the experiment was performed in the same manner as in Experimental Example 4 except that the mass part of water relative to 100 parts by mass of the dry mortar was changed and the inner diameter of the mortar pumping hose was changed to the values shown in Table 5. The results are shown in Table 5.
  • Example 6 100 parts by weight of cement, 5 parts by weight of calcium aluminosilicate, 5 parts by weight of gypsum, 6 parts by weight of calcium hydroxide, 0.1 part by weight of water-soluble polymer, 0.5 parts by weight of fiber with respect to 100 parts by weight of the resulting dry mortar. Then, 60 parts by mass of the aggregate and 100 parts by mass of the obtained dry mortar were mixed with an organic acid (hydroxyl acid) in an amount shown in Table 6 using a Nauta mixer to produce a dry mortar.
  • organic acid hydroxyl acid
  • Example 7 100 parts by weight of cement, 5 parts by weight of calcium aluminosilicate, 5 parts by weight of gypsum, 6 parts by weight of calcium hydroxide, 0.1 part by weight of water-soluble polymer, and 0.5 parts by volume of fiber for 100 parts by weight of the resulting dry mortar 60 parts by mass of aggregate in 100 parts by mass of the resulting part and dry mortar were mixed using a Nauta mixer to produce dry mortar.
  • each raw material component all used the same thing as described in Experimental example 4.
  • the experiment was performed in the same manner as in Experimental Example 5 except that the amount of air blown into the dry mortar and the inner diameter of the hose for conveying the acidic liquid quick-setting agent were changed to the values shown in Table 7. The results are shown in Table 7.
  • Dust amount The dust amount 5 m behind the spraying location was measured with a digital dust meter for 1 minute from the start of spraying.
  • Example 8 The same dry mortar as in Experimental Example 7 was performed in the same manner as in Experimental Example 6 except that the test was performed by changing the method of charging the hopper of a P4 G4 continuous mixer pump.
  • a method for supplying dry mortar with a screw conveyor is shown in FIG. ⁇ Input method> Manual loading: The product bag was opened and loaded. Screw conveyor charging: A hopper tank 1 and a screw conveyor 2 were used. Dry mortar was put into the continuous kneading mixer pump 3 from the hopper tank 1 with the screw conveyor 2 (FIG. 1).
  • Example 9 The same dry mortar as in Experimental Example 7 was performed in the same manner as in Experimental Example 6 except that the method for supplying the dry mortar to the hopper tank in Experimental Example 8 was changed and tested.
  • FIG. 2 shows the dry mortar supply method
  • Table 9 shows the results.
  • ⁇ Supply method> Flexible container The flexible container was opened and charged from the upper part of the primary hopper tank 8.
  • Screw conveyor Dry mortar was put into the hopper tank 1 from the primary hopper tank 8 by the screw conveyor 2 '. Dry mortar was put into the continuous kneading mixer pump 3 from the hopper tank 1 with the screw conveyor 2 (FIG. 2).
  • Pneumatic transport Air having an air pressure of 0.4 MPa is supplied from the pneumatic transport hose 9 to the primary hopper tank 8, and the dry mortar is transported from the primary hopper tank 8 to the hopper tank 1 via the mortar pumping hose 4 ′. (FIG. 3).
  • the spraying material of the present invention and the spraying method using the same can ensure an environment with high worker safety even in spraying work in a narrow work space such as a small cross-section tunnel.
  • a continuous mixer pump can be used to improve work efficiency.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

L'invention concerne une matière à pulvériser et un procédé de pulvérisation l'utilisant, qui sont hautement sûrs pour les personnes, présentent des propriétés de pompage de la matière favorables, permettent d'obtenir d'excellentes propriétés physiques et résultent en peu de rebond. L'invention concerne une matière à pulvériser ayant un temps de début de durcissement inférieur ou égal à 5 min et un temps de fin de durcissement inférieur ou égal à 30 min à 20 °C, et comprenant un mortier qui présente une valeur d'écoulement de 170 à 250 mm et qui est obtenu par mélange de 18 à 22 parties en masse d'eau par rapport à un mortier sec contenant 100 parties en masse de ciment, 2 à 8 parties en masse d'aluminosilicate de calcium, 1 à 12 parties en masse de plâtre, 4 à 8 parties en masse d'hydroxyde de calcium, 0,05 à 0,3 partie en masse d'un polymère soluble dans l'eau, 0,2 à 1 partie en volume de fibres par rapport à 100 parties en volume du mortier sec, et 50 à 70 parties en masse d'un agrégat ayant une taille de grain maximale de 1,2 mm ou moins dans 100 parties en masse de mortier sec, et comprenant également un agent de durcissement rapide liquide acide comprenant un élément métal alcalin et/ou du fluor. L'invention concerne également un procédé de pulvérisation utilisant la matière à pulvériser.
PCT/JP2011/078975 2011-12-14 2011-12-14 Matière à pulvériser et procédé de pulvérisation l'utilisant WO2013088542A1 (fr)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017165632A (ja) * 2016-03-17 2017-09-21 太平洋マテリアル株式会社 吹付用モルタル
CN108894475A (zh) * 2018-09-19 2018-11-27 北京程工机械技术研究院 全自动石膏喷涂抹墙机
EP4092005A1 (fr) * 2021-05-19 2022-11-23 Daw Se Précurseur de mortier sec, mortier sec, matière de revêtement aqueuse contenant du mortier sec, revêtement à partir de la matière de revêtement aqueuse, système d'isolation thermique contenant le revêtement et l'utilisation ou matière de revêtement

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008254973A (ja) * 2007-04-06 2008-10-23 Denki Kagaku Kogyo Kk 吹付け材料及びそれを用いた吹付け工法

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008254973A (ja) * 2007-04-06 2008-10-23 Denki Kagaku Kogyo Kk 吹付け材料及びそれを用いた吹付け工法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017165632A (ja) * 2016-03-17 2017-09-21 太平洋マテリアル株式会社 吹付用モルタル
CN108894475A (zh) * 2018-09-19 2018-11-27 北京程工机械技术研究院 全自动石膏喷涂抹墙机
EP4092005A1 (fr) * 2021-05-19 2022-11-23 Daw Se Précurseur de mortier sec, mortier sec, matière de revêtement aqueuse contenant du mortier sec, revêtement à partir de la matière de revêtement aqueuse, système d'isolation thermique contenant le revêtement et l'utilisation ou matière de revêtement

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