WO2019044484A1 - Composition de mortier ou de béton et son procédé de fabrication - Google Patents

Composition de mortier ou de béton et son procédé de fabrication Download PDF

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Publication number
WO2019044484A1
WO2019044484A1 PCT/JP2018/030248 JP2018030248W WO2019044484A1 WO 2019044484 A1 WO2019044484 A1 WO 2019044484A1 JP 2018030248 W JP2018030248 W JP 2018030248W WO 2019044484 A1 WO2019044484 A1 WO 2019044484A1
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Prior art keywords
mortar
parts
mass
blast furnace
furnace slag
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PCT/JP2018/030248
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English (en)
Japanese (ja)
Inventor
貴光 室川
三島　俊一
岩崎　昌浩
彰宏 保利
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デンカ株式会社
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Publication of WO2019044484A1 publication Critical patent/WO2019044484A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
    • B28C7/04—Supplying or proportioning the ingredients
    • 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
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/08—Acids or salts thereof
    • 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
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/08—Acids or salts thereof
    • C04B22/14—Acids or salts thereof containing sulfur in the anion, e.g. sulfides
    • 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
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/04—Carboxylic acids; Salts, anhydrides or esters thereof
    • C04B24/06—Carboxylic acids; Salts, anhydrides or esters thereof containing hydroxy groups
    • 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
    • C04B28/08—Slag cements
    • 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
    • C04B7/00—Hydraulic cements
    • C04B7/14—Cements containing slag
    • C04B7/147—Metallurgical slag
    • C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
    • C04B7/17—Mixtures thereof with other inorganic cementitious materials or other activators with calcium oxide containing activators
    • C04B7/19—Portland cements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding

Definitions

  • the present invention relates to mortar or concrete compositions and methods of making the same.
  • the present invention relates to a mortar or concrete composition used as a material to be sprayed on an exposed ground surface in a road, a railway, a tunnel such as a water channel, an underground structure, a slope, etc.
  • the primary lining is performed with a blowing material such as a blowing concrete or a blowing mortar, and after the ground is stabilized in this state, further normal Secondary lining work is being carried out with concrete.
  • a blowing material such as a blowing concrete or a blowing mortar
  • the second lining work may not be performed, and the permanent lining work may be performed only with the blowing material.
  • the spray material is required to have high durability and water tightness.
  • Patent Document 1 a spraying method using a spraying material in which a quick-setting agent is added to mortar or concrete is known (for example, Patent Document 1).
  • Patent Document 1 After mixing cement, aggregate and water in advance in a weighing and mixing plant usually installed at an excavation site, the mixture is transported by an agitator car and pressure-fed by a concrete pump, The spray material is prepared by mixing with the quick delivery agent pumped from the other. Then, the spray material is sprayed to the ground surface to a predetermined thickness.
  • Conventionally used quick-setting agents include mixtures containing calcium aluminate, alkali metal aluminates and alkali metal carbonates, etc., calcined alum, mixtures containing alkali metal aluminates and alkali metal carbonates, etc., calcium Mixtures containing aluminate and 3CaO ⁇ SiO 2, etc., and mixtures containing slaked lime, alkali metal aluminates and alkali metal carbonates, etc. are known (eg, Patent Documents 2 to 5). These accelerators function to promote the setting of cement, and they are all added to the spray material and used.
  • blast furnace slag has been effectively used by replacing it with cement contained in a spray material from the viewpoint of resistance to seawater, durability such as chemical resistance, and suppression of alkali aggregate reaction.
  • blast furnace slag is expected to promote effective utilization as a component of a spray material used in construction under special conditions such as acid soil, hot spring, and seawater.
  • the quick-setting agent mainly composed of aluminum sulfate generally exhibits acidity, hydrogen sulfide gas is generated when it is added to a blasting material containing a large amount of blast furnace slag. Hydrogen sulfide gas tends to stay in an enclosed space such as a tunnel or underground structure because it is heavier than air.
  • blast furnace slag-containing cement cement containing blast furnace slag
  • the present invention has been made to solve the above problems, and can effectively utilize blast furnace slag, and can suppress the generation of hydrogen sulfide gas and also has excellent rapid solidification under various conditions. And a mortar or concrete composition having strength development and a method for producing the same.
  • the present invention provides a mortar or concrete containing a blast furnace slag-containing cement of 300 to 1000 kg / m 3 ; 50 to 100 parts by mass of anhydrous calcium sulfate, 10 to 30 parts by mass of aluminum sulfate, 0.1 to 1.0 parts by mass of anhydrous citric acid and 0.1 to 4 parts of sodium aluminate per 100 parts by mass of calcium aluminates.
  • the present invention also relates to the step of preparing a mortar or concrete containing a blast furnace slag-containing cement of 300 to 1000 kg / m 3 , 50 to 100 parts by mass of anhydrous calcium sulfate, 10 to 30 parts by mass of aluminum sulfate, 0.1 to 1.0 parts by mass of anhydrous citric acid and 0.1 to 4 parts of sodium aluminate per 100 parts by mass of calcium aluminates.
  • Preparing an accelerator comprising 7 parts by weight;
  • blast furnace slag it is possible to effectively use blast furnace slag and provide a mortar or concrete composition which suppresses generation of hydrogen sulfide gas and has excellent rapid consolidation and strength development even under various conditions. be able to.
  • the mortar or concrete composition of the present invention comprises mortar or concrete and a thickener.
  • the mortar or concrete used for the mortar or concrete composition of the present invention contains blast furnace slag-containing cement.
  • blast furnace slag-containing cement means a mixture of cement and blast furnace slag, and blast furnace slag cement of types A to C specified in the JIS standard.
  • blast furnace slag refers to an aluminosilicate obtained by crushing, vitrifying and quenching molten slag, which is by-produced when making pig iron from iron ore in a blast furnace, by quenching with water, air, etc. It means a fine powder mainly composed of salt.
  • the mass ratio of cement to blast furnace slag in cement containing blast furnace slag is not particularly limited, but is preferably 1: 9 to 9: 1.
  • the mass ratio of the blast furnace slag is too high, the initial strength development may decrease or hydrogen sulfide gas may be easily generated.
  • the mass ratio of blast furnace slag is too low, durability may fall.
  • Blaine specific surface area of the blast furnace slag is not particularly limited, and preferably 2500 ⁇ 7000cm 2 / g, more preferably 2500 ⁇ 6000cm 2 / g. If the brane specific surface area of the blast furnace slag is less than 2500 cm 2 / g, properties such as rapid consolidation, strength development and durability may not be obtained sufficiently. On the other hand, if the brane specific surface area of the blast furnace slag exceeds 7000 cm 2 / g, the cost increases due to the increase in the degree of fineness. In addition, the effects of improving the properties such as rapid solidification, strength development, and durability may be saturated, and the generation of hydrogen sulfide gas may be promoted.
  • Blaine specific surface area of the cement is not particularly limited, and preferably 2000 ⁇ 6000cm 2 / g, more preferably 2500 ⁇ 5500cm 2 / g.
  • the brane specific surface area of cement is less than 2000 cm 2 / g, it may promote the generation of hydrogen sulfide generating gas.
  • the brane specific surface area of cement exceeds 6000 cm 2 / g, the cost may increase due to the increase in the degree of fineness.
  • the unit mass of blast furnace slag-containing cement in mortar or concrete is 300 to 1000 kg / m 3 . If the unit volume mass of the blast furnace slag-containing cement is less than 300 kg / m 3 , the blast furnace slag-containing cement is not uniformly mixed in the mortar or concrete, and the workability is reduced. On the other hand, if the unit volume mass of the blast furnace slag-containing cement exceeds 1000 kg / m 3 , generation of hydrogen sulfide gas may be promoted.
  • Mortar or concrete generally contains aggregate.
  • the aggregate is not particularly limited, but preferably has a low water absorption rate and a high aggregate strength.
  • fine aggregates include river sand, mountain sand, sea sand, lime sand, and silica sand.
  • coarse aggregate include river gravel, mountain gravel, lime gravel, crushed sand, crushed stone, artificial aggregate (slag aggregate and the like) and the like. These can be used alone or in combination of two or more.
  • the maximum particle size of the aggregate is not particularly limited, but is preferably 20 mm or less, more preferably 15 mm or less. If the maximum particle size of the aggregate exceeds 20 mm, the nozzle may be clogged when using the mortar or concrete composition as the spray material.
  • the mortar or concrete may contain materials other than blast furnace slag-containing cement, as long as the effects of the present invention are not impaired.
  • materials are ordinary, early strong, ultra early strong, moderate heat, and low heat various Portland cement, silica fume, rice husk ash, fly ash, natural pozzolanes, limestone fine powder, admixtures such as zeolite, etc.
  • the pH of the mortar or concrete is not particularly limited, but is preferably 11 or more. When the pH of the mortar or concrete is less than 11, the generation of hydrogen sulfide gas may not be sufficiently suppressed when it is combined with the accelerator.
  • the accelerators used in the mortar or concrete composition of the present invention include calcium aluminates, anhydrous calcium sulfate, aluminum sulfate, citric anhydride and sodium aluminate.
  • calcium aluminates is obtained by mixing a raw material containing calcia with a raw material containing alumina, and performing heat treatment such as firing in a kiln, melting in an electric furnace, etc. it is a generic term for a compound having a hydration activity mainly containing CaO and Al 2 O 3.
  • the term "main component” means that the proportion of the main component exceeds 50% by mass.
  • a part of CaO and / or Al 2 O 3 is an alkali metal oxide, an alkaline earth metal oxide, a silicon oxide, a titanium oxide, an iron oxide, an alkali metal halogen compound, an alkaline earth Compounds substituted with substances such as metal halides, alkali metal sulfates and alkaline earth metal sulfates; compounds in which a small amount of the above-mentioned substances are solid-solved in compounds mainly composed of CaO and Al 2 O 3 .
  • the mineral form of calcium aluminate is not particularly limited, and may be crystalline, amorphous, or a mixture thereof.
  • the molar ratio of CaO with respect to Al 2 O 3 calcium aluminates is not particularly limited, preferably 2.0 to 2.6. When this molar ratio is less than 2.0, the initial strength development may decrease. On the other hand, if this molar ratio exceeds 2.6, long-term strength development may decrease.
  • Anhydrous calcium sulfate is anhydrous gypsum.
  • gypsum As forms of gypsum, there are Type I, Type II and Type III, but any form can be used.
  • gypsum both byproducts and natural products can be used, and powdery ones are preferably used.
  • the brane specific surface area of anhydrous calcium sulfate is not particularly limited, but is preferably 4000 to 8000 cm 2 / g. If the brain specific surface area of anhydrous calcium sulfate is less than 4000 cm 2 / g, long-term strength development may decrease. On the other hand, when the brane specific surface area of anhydrous calcium sulfate exceeds 8000 cm 2 / g, the initial strength development may decrease.
  • the blending amount of anhydrous calcium sulfate in the quick-setting agent is 50 to 100 parts by mass with respect to 100 parts by mass of calcium aluminates. If the blending amount of anhydrous calcium sulfate is less than 50 parts by mass, the long-term strength developing property is reduced. On the other hand, if the compounding amount of anhydrous calcium sulfate exceeds 100 parts by mass, the initial strength developing property is lowered.
  • n is 0 to 20, but any hydrate can be used.
  • aluminum sulfate is preferably an anhydrous salt, tetrahydrate, octahydrate, 14-18 hydrate or a combination thereof from the viewpoint of strength development.
  • the blending amount of aluminum sulfate in the quick-setting agent is 10 to 30 parts by mass with respect to 100 parts by mass of calcium aluminates. If the blending amount of aluminum sulfate is less than 10 parts by mass, the initial strength development is lowered. On the other hand, if the blending amount of aluminum sulfate exceeds 30 parts by mass, the generation of hydrogen sulfide gas can not be sufficiently suppressed.
  • Citric anhydride is generally used as a retarder.
  • gluconic acid, tartaric acid, malic acid, salts thereof and the like are also known as retarders
  • citric acid anhydride is selected and used as a quick-setting agent used in the present invention. This is because retarders other than anhydrous citric acid can not sufficiently obtain the effects of the present invention.
  • an oxycarboxylic acid other than anhydrous citric acid is used as a quick-setting agent, the initial strength development tends to be inhibited.
  • the blending amount of citric acid anhydride in the quick-setting agent is 0.1 to 1.0 parts by mass with respect to 100 parts by mass of calcium aluminates.
  • the blending amount of anhydrous citric acid is less than 0.1 parts by mass, significant setting starts immediately after mixing the quick-setting agent with mortar or concrete. As a result, the adhesion to the object to be sprayed may be reduced, or the nozzle may be clogged by solidification before spraying the mortar or concrete composition.
  • the blending amount of citric anhydride exceeds 1.0 parts by mass, the setting becomes slow and the initial strength developing property is lowered.
  • Sodium aluminate is represented by NaAlO 2 or Na [Al (OH) 4 ]. That is, as sodium aluminate, sodium aluminum dioxide and sodium tetrahydroxy aluminate or a mixture thereof can be used.
  • the molar ratio (R 2 O / Al 2 O 3 ) of R 2 O (R is an alkali metal) to Al 2 O 3 of sodium aluminate is not particularly limited, but preferably 1.0 to 1.5, more preferably Is from 1.05 to 1.45. When this molar ratio is less than 1.0, deliquescent becomes remarkable, and the handleability may fall. On the other hand, if this molar ratio exceeds 1.5, the initial strength development may decrease.
  • the blending amount of sodium aluminate is 0.1 to 4.7 parts by mass with respect to 100 parts by mass of calcium aluminates. While generation
  • the form of the quick-setting agent containing the above components is not particularly limited.
  • the accelerator may be powder, liquid, suspension, slurry and the like.
  • the total alkali amount of the accelerator is not particularly limited, but is less than 1% by mass.
  • the total amount of alkalis is an amount of R 2 O conversion (R is an alkali metal).
  • the total amount of alkali is related to the amount of sodium aluminate. By controlling the total amount of alkalis to less than 1% by mass, it is possible to suppress the reaction of the alkali aggregate and to improve the durability.
  • pH of a quick-setting agent Preferably it is nine or more.
  • the pH of the accelerator is less than 9, when combined with mortar or concrete, the generation of hydrogen sulfide gas may not be sufficiently suppressed.
  • the blending amount of the quick-setting agent in the mortar or concrete composition of the present invention is 3 to 20 parts by mass, preferably 4 to 18 parts by mass, more preferably 5 to 15 parts by mass with respect to 100 parts by mass of blast furnace slag-containing cement. It is. If the blending amount of the quick-setting agent is less than 3 parts by mass, the initial strength developing property is reduced. On the other hand, if the blending amount of the quickening agent exceeds 20 parts by mass, the long-term strength developing property is lowered.
  • the mortar or concrete composition of the present invention can contain, in addition to the components described above, materials known in the art as long as the effects of the present invention are not impaired.
  • the known materials should be selected as components that do not generate hydrogen sulfide gas when formulated into the mortar or concrete composition of the present invention.
  • known materials include alkaline earth metal aluminate, alkaline metal carbonate, alkaline metal hydrogen salt, alkaline earth metal hydrogen salt, alkaline earth metal sulfate, alkaline metal sulfate, water reducing agent, dispersant And thickeners. These can be used alone or in combination of two or more.
  • the mortar or concrete composition of the present invention is produced by preparing mortar or concrete containing a predetermined component and a quick-setting agent containing a predetermined component, respectively, and adding the quick-setting agent to the mortar or concrete and mixing them. can do.
  • the method for producing a mortar or concrete composition according to the present invention comprises the steps of preparing mortar or concrete containing blast furnace slag-containing cement, calcium aluminates, anhydrous calcium sulfate, aluminum sulfate, anhydrous citric acid and aluminum The steps of preparing a quick-setting agent containing sodium acid and mixing mortar or concrete with the quick-setting agent are included. In this manufacturing method, the materials to be used and the blending amounts are the same as described above, and therefore the description thereof is omitted.
  • the mortar or concrete composition of the present invention produced as described above does not generate hydrogen sulfide gas even in a closed space such as a tunnel, and it is highly rapid even under the situation where spring water and ground surface are deteriorated. Since binding properties can be obtained, it can be applied particularly to places where long-term strength development is required.
  • the mortar or concrete composition of the present invention can effectively utilize blast furnace slag, and the durability of the hardened body is generally excellent even under special ground conditions such as under sea water, under hot spring, under acidic conditions, etc. It is higher than the case of using cement.
  • the mortar or concrete composition of the present invention is most suitable for use as a spray material because it suppresses the generation of hydrogen sulfide gas and has excellent rapid consolidation and strength development even under various conditions. .
  • the construction method is not particularly limited, and various spray construction methods are selected and used according to the required physical properties, economy, and workability. be able to.
  • the conveyance method of mortar or concrete and a quick-bonding material is not specifically limited, A piston type, a squeeze type, compressed air, or the type which compounded these may be used.
  • the mixing method of the mortar or concrete and the quick-setting agent is not particularly limited, and, for example, a method of combining and mixing the transported mortar or concrete and the quick-setting agent in a joining pipe can be used.
  • Example 1 (Raw material of mortar) Cement: Ordinary Portland cement (made by Denka Co., Ltd.), density 3.15 g / cm 3 Blast furnace slag: Blast furnace slag fine powder (commercially available), density 2.90 g / cm 3 , bran specific surface area 4000 cm 2 / g Fine aggregate: Niigata Prefecture Himekawa water system river sand, density 2.61 g / cm 3 Water reducing agent: Polycarboxylic acid high performance water reducing agent (commercially available), liquid water: Water for tap water (raw material for quick-setting agent) Calcium aluminates: CaO / Al 2 O 3 molar ratio 2.3, Blaine specific surface area 6000 cm 2 / g Anhydrous calcium sulfate: Natural product, Blaine specific surface area 5000 cm 2 / g Aluminum sulf
  • a mortar (pH 12.5) was prepared by mixing 800 g of a blast furnace slag-containing cement, 2000 g of a fine aggregate, 8 g of a water reducing agent and 400 g of water prepared at a mass ratio of cement to blast furnace slag of 1: 1 for 1 minute.
  • the unit volume mass of the blast furnace slag containing cement in this mortar was 450 kg / m 3 .
  • calcium aluminates, anhydrous calcium sulfate, aluminum sulfate, anhydrous citric acid and sodium aluminate were mixed in the proportions shown in Table 1 to prepare a quick-setting agent.
  • the quick-setting agent is added to the mortar and mixed such that the amount of the quick-setting agent added is 10 parts by mass with respect to 100 parts by mass of the blast furnace slag-containing cement
  • the mortar composition was thus prepared.
  • the mortar composition of the example using the quick-setting agent having the predetermined composition has a short setting time, is excellent in strength development, and generation of hydrogen sulfide gas is not confirmed. (No. 1-2 to 1-4, 1-7 to 1-8, 1-11 to 1-12 and 1-15 to 1-16).
  • the mortar composition using the quick-setting agent with a small proportion of anhydrous calcium sulfate although the setting time was short, the compressive strength value of material age 24 hours and 28 days decreased (No. 1-1) .
  • the mortar composition using a quick-setting agent having a large proportion of anhydrous calcium sulfate had a decrease in compressive strength value at 1 hour and 3 hours of material age (No. 1-5).
  • the mortar composition using a quick-setting agent with a small proportion of aluminum sulfate had reduced compressive strength values at 1 hour and 3 hours of material age (No. 1-6).
  • a mortar composition using a quick-setting agent having a large proportion of aluminum sulfate had a short setting time and good strength development, but generated hydrogen sulfide gas (No. 1-9).
  • the mortar composition using a quick-setting agent with a small proportion of anhydrous citric acid was poor in workability because the setting time was too short, and the compressive strength values of all materials decreased (No. 1-10).
  • the mortar composition using the quick-setting agent having a large proportion of anhydrous citric acid had a long setting time, and the compressive strength values at 1 hour and 3 hours of age decreased (No. 1-13).
  • the mortar composition using a quick-setting agent with a low proportion of sodium aluminate had a long setting time, and the compressive strength values at 1 hour and 3 hours of age also decreased (No. 1-14).
  • the mortar composition using the quick-setting agent having a large proportion of sodium aluminate was poor in workability because the setting time was too short (No. 1-17).
  • Example 2 A mortar was prepared in the same manner as in Example 1 except that the mass ratio of cement to blast furnace slag was changed as shown in Table 3. Next, a quick-setting agent C of Example 1 was prepared. Next, 30 minutes after preparing the mortar, the quick-setting agent is added to the mortar and mixed such that the amount of the quick-setting agent added is 10 parts by mass with respect to 100 parts by mass of the blast furnace slag-containing cement The mortar composition was thus prepared. Next, with respect to the obtained mortar composition, in the same manner as in Example 1, the setting property, the strength developing property and the generation amount of hydrogen sulfide gas were evaluated. The results are shown in Table 3.
  • the mortar composition of the example using the blast-furnace slag-containing cement has a short setting time, excellent strength development, and no generation of hydrogen sulfide gas was confirmed (No. 2-2 to 2-7).
  • the compressive strength value at 1 hour of age decreased (No. 2-1).
  • mortar compositions using blast furnace slag instead of blast furnace slag-containing cement had a long setting time and decreased compressive strength values of all materials (No. 2-8).
  • Blast furnace slag ⁇ Blast furnace slag fine powder (commercially available), density 2.90 g / cm 3 , bran specific surface area 4000 cm 2 / g Blast furnace slag ⁇ : Blast furnace slag fine powder (commercially available), density 2.90 g / cm 3 , bran specific surface area 2500 cm 2 / g Blast furnace slag ⁇ : Blast furnace slag fine powder (commercially available), density 2.90 g / cm 3 , bran specific surface area 7000 cm 2 / g
  • a mortar was prepared in the same manner as in Example 1 except that the type of blast furnace slag was changed as shown in Table 4.
  • a quick-setting agent C of Example 1 was prepared.
  • the quick-setting agent is added to the mortar and mixed such that the amount of the quick-setting agent added is 10 parts by mass with respect to 100 parts by mass of the blast furnace slag-containing cement
  • the mortar composition was thus prepared.
  • the setting property, the strength developing property and the generation amount of hydrogen sulfide gas were evaluated. The results are shown in Table 4.
  • Example 4 The following were used as aluminum sulfate.
  • Aluminum sulfate a 14 to 18 water salt
  • reagent aluminum sulfate b 8 water salt
  • reagent aluminum sulfate c 4 water salt
  • reagent aluminum sulfate d anhydrous salt
  • a mortar was prepared in the same manner as Example 1.
  • a rapid binder was prepared under the same conditions as rapid binder C of Example 1 except that the type of aluminum sulfate was changed as shown in Table 5.
  • the quick-setting agent is added to the mortar and mixed such that the amount of the quick-setting agent added is 10 parts by mass with respect to 100 parts by mass of the blast furnace slag-containing cement
  • the mortar composition was thus prepared.
  • the setting property, the strength developing property and the generation amount of hydrogen sulfide gas were evaluated. The results are shown in Table 5.
  • Example 5 The following were used as sodium aluminate.
  • Sodium aluminate a sodium aluminum dioxide
  • reagent sodium aluminate b sodium tetrahydroxyaluminate
  • reagent In the same manner as in Example 1, a mortar was prepared.
  • a quick-setting agent was prepared under the same conditions as rapid-setting agent C of Example 1 except that the type of sodium aluminate was changed as shown in Table 6.
  • the quick-setting agent is added to the mortar and mixed such that the amount of the quick-setting agent added is 10 parts by mass with respect to 100 parts by mass of the blast furnace slag-containing cement
  • the mortar composition was thus prepared.
  • the setting property, the strength developing property and the generation amount of hydrogen sulfide gas were evaluated. The results are shown in Table 6.
  • Example 6 A mortar was prepared in the same manner as Example 1. Next, a rapid binder was prepared under the same conditions as rapid binder C of Example 1 except that the molar ratio of CaO / Al 2 O 3 of calcium aluminates was changed as shown in Table 7. In all calcium aluminates, the surface area of brane was standardized to 6000 cm 2 / g. Next, 30 minutes after preparing the mortar, the quick-setting agent is added to the mortar and mixed such that the amount of the quick-setting agent added is 10 parts by mass with respect to 100 parts by mass of the blast furnace slag-containing cement The mortar composition was thus prepared. Next, with respect to the obtained mortar composition, in the same manner as in Example 1, the setting property, the strength developing property and the generation amount of hydrogen sulfide gas were evaluated. The results are shown in Table 7.
  • Example 7 A mortar composition was prepared using the following method. In addition, the compounding quantity of each component is the same as that of Example 1. As an accelerator, accelerator C of Example 1 was used. Method a: The same method as in Example 1 was used. Method b: A mortar composition was prepared by mixing blast furnace slag-containing cement, fine aggregate, water-reducing agent and quick-setting agent to prepare a dry mortar and then adding water and mixing for 10 seconds. Method c: A mortar composition was prepared by mixing blast furnace slag-containing cement, fine aggregate, water reducing agent, accelerator and water for 10 seconds. Next, with respect to the obtained mortar composition, in the same manner as in Example 1, the setting property, the strength developing property and the generation amount of hydrogen sulfide gas were evaluated. The results are shown in Table 8.
  • the mortar composition prepared by adding and mixing the quick-setting agent to the mortar has a short setting time and excellent strength development. Furthermore, it was confirmed that no hydrogen sulfide gas was generated (No. 7-1). On the other hand, a mortar composition (No. 7-2) prepared by previously adding a quick-setting agent to the mortar, and a mortar composition (No. In 7-3), generation of hydrogen sulfide gas was confirmed.
  • blast furnace slag can be effectively used, and generation of hydrogen sulfide gas can be suppressed, and excellent rapid consolidation and strength development can be achieved even under various conditions.
  • Mortar or concrete compositions and methods of making the same can be provided.
  • the mortar or concrete composition of the present invention Since the mortar or concrete composition of the present invention has the above-mentioned characteristics, it can be used as a spraying material even under special seawater environments such as under sea water, under a hot spring, under acid conditions, etc. Collapse can be effectively prevented. In addition, since the amount of hydrogen sulfide gas can also be suppressed by the combination of the blast furnace slag-containing cement and the acid quicker, which are the problems of the acid quicker, the safety can be improved.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)

Abstract

L'invention concerne une composition de mortier ou de béton qui comprend un mortier ou du béton contenant de 300 à 1 000 kg/m3 d'un ciment contenant du laitier de haut fourneau et un agent d'accélération de prise, ledit agent d'accélération de prise comprenant, pour 100 parties en masse d'aluminate de calcium, de 50 à 100 parties en masse d'anhydride de sulfate de calcium, de 10 à 30 parties en masse de sulfate d'aluminium, de 0,1 à 1,0 partie en masse d'anhydride citrique et de 0,1 à 4,7 parties en masse d'aluminate de sodium. Dans cette composition de mortier ou de béton, la teneur de l'agent d'accélération de prise est de 3 à 20 parties en masse pour 100 parties en masse du ciment contenant du laitier de haut fourneau.
PCT/JP2018/030248 2017-08-28 2018-08-13 Composition de mortier ou de béton et son procédé de fabrication WO2019044484A1 (fr)

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JP2017163658A JP2020203800A (ja) 2017-08-28 2017-08-28 モルタル又はコンクリート組成物及びその製造方法
JP2017-163658 2017-08-28

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116621489A (zh) * 2023-07-24 2023-08-22 石家庄市长安育才建材有限公司 一种喷射混凝土掺合料
WO2023182477A1 (fr) * 2022-03-25 2023-09-28 デンカ株式会社 Agent d'accélération en poudre, agent d'accélération en suspension, matériau de pulvérisation, et procédé de pulvérisation

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09278510A (ja) * 1996-04-10 1997-10-28 Asahi Denka Kogyo Kk 悪臭の除去された高炉スラグ系グラウト
JPH10259047A (ja) * 1997-03-17 1998-09-29 Denki Kagaku Kogyo Kk 急結剤、セメント組成物、吹付材料、及びそれを用いた吹付工法
KR20070066736A (ko) * 2005-12-22 2007-06-27 재단법인 포항산업과학연구원 고로슬래그 중의 황화수소 제거 방법

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09278510A (ja) * 1996-04-10 1997-10-28 Asahi Denka Kogyo Kk 悪臭の除去された高炉スラグ系グラウト
JPH10259047A (ja) * 1997-03-17 1998-09-29 Denki Kagaku Kogyo Kk 急結剤、セメント組成物、吹付材料、及びそれを用いた吹付工法
KR20070066736A (ko) * 2005-12-22 2007-06-27 재단법인 포항산업과학연구원 고로슬래그 중의 황화수소 제거 방법

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023182477A1 (fr) * 2022-03-25 2023-09-28 デンカ株式会社 Agent d'accélération en poudre, agent d'accélération en suspension, matériau de pulvérisation, et procédé de pulvérisation
CN116621489A (zh) * 2023-07-24 2023-08-22 石家庄市长安育才建材有限公司 一种喷射混凝土掺合料
CN116621489B (zh) * 2023-07-24 2023-10-27 石家庄市长安育才建材有限公司 一种喷射混凝土掺合料

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