Classifications

• • 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
  • C04B7/32—Aluminous cements
  • C04B7/323—Calcium aluminosulfate cements, e.g. cements hydrating into ettringite
• • 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
  • C04B28/14—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 calcium sulfate cements
  • C04B28/16—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 calcium sulfate cements containing anhydrite, e.g. Keene's cement
• • 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
  • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
  • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
  • C04B40/0039—Premixtures of 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
  • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
  • C04B2103/10—Accelerators; Activators
  • C04B2103/14—Hardening accelerators
• • 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
• • 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
  • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
  • Y02W30/00—Technologies for solid waste management
  • Y02W30/50—Reuse, recycling or recovery technologies
  • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Definitions

• the present invention relates to an early demolding material for concrete products used in the field of civil engineering and architecture, and a method for producing concrete products.
• Japanese Unexamined Patent Publication No. 2000-301531 Japanese Unexamined Patent Publication No. 2001-294460 Japanese Unexamined Patent Publication No. 2011-153068 Japanese Unexamined Patent Publication No. 2000-233959 Japan Special Table 2008-519752 gazette
• An object of the present invention is to provide an early demolding material and a method for producing a concrete product that can enhance the development of initial strength even when mixed cement is used and suppress the generation of latency.
• the gist of the present invention is as follows. (1) A heat treatment is performed on a mixture of a CaO raw material, a CaSO 4 raw material, and at least one raw material selected from the group consisting of an Al 2 O 3 raw material, an Fe 2 O 3 raw material, and an SiO 2 raw material. And contained in a ratio of 10 to 70 parts by weight of free lime, 10 to 50 parts by weight of hydraulic compound, and 10 to 60 parts by weight of anhydrous gypsum in a total of 100 parts by weight of free lime, hydraulic compound and anhydrous gypsum. An early demolding material containing a heat-treated product.
• the early demolding material according to the above (1) having a Blaine specific surface area of 2500 to 9000 cm 2 / g.
• the early demolding material according to the above (1) or (2) further comprising 40 parts by mass or less of particulate Portland cement in 100 parts by mass of the early demolding material.
• the early demolding material according to any one of the above (1) to (5) further comprising fine lime and / or fine anhydrite.
• the hydraulic compound is a mixture of 3CaO ⁇ 3Al 2 O 3 ⁇ CaSO 4 or 3CaO ⁇ 3Al 2 O 3 ⁇ CaSO 4 and 4CaO ⁇ Al 2 O 3 ⁇ Fe 2 O 3, and 2CaO ⁇ SiO 2
• the early demolding material according to any one of (1) to (6) above.
• the early demolding material according to any one of the above (1) to (7) is blended in an amount of 2 to 15 parts by mass in 100 parts by mass of a cement composition composed of cement and an early demolding material.
• a method for producing a concrete product characterized in that a steam curing temperature until demolding is 70 ° C. or less, and a maturity from casting to demolding is 210 to 320 ° C. ⁇ hr.
• the early demolding material of the present invention Due to the early demolding material of the present invention, it is possible to achieve a surface finish and steam curing early compared to the prior art, and it is possible to ensure a predetermined compressive strength even if the curing period is short, even in the case of using mixed cement in a short time. Compressive strength develops, enabling early demolding of the concrete, and also has an effect of suppressing latency formed on the surface of the concrete product and an effect of suppressing shrinkage strain that causes cracking.
• Part and “%” used in the present invention are based on mass unless otherwise specified.
• the concrete referred to in the present invention is a general term for cement paste, cement mortar, and cement concrete.
• the heat-treated product of the present invention is a mixture of a CaO raw material, a CaSO 4 raw material, and at least one raw material selected from the group consisting of an Al 2 O 3 raw material, an Fe 2 O 3 raw material, and a SiO 2 raw material.
• the product is obtained by heat treatment in the atmosphere.
• the free lime referred to in the present invention is usually called f-CaO.
• the hydraulic compound referred to in the present invention is yelimeite (also referred to as Auin) represented by 3CaO.3Al 2 O 3 .CaSO 4 , 3CaO.SiO 2 (abbreviated as C 3 S) and 2CaO.SiO 2 (C calcium silicate represented by 2 S abbreviated), 4CaO ⁇ Al 2 O 3 ⁇ Fe 2 O 3 (C 4 AF for short) and 6CaO ⁇ 2Al 2 O 3 ⁇ Fe 2 O 3 (C 6 a 2 F abbreviated ) And 6CaO.Al 2 O 3 .Fe 2 O 3 (abbreviated as C 6 AF), or calcium ferrite such as 2CaO ⁇ Fe 2 O 3 (abbreviated as C 2 F), and these It is preferable that 1 type or 2 types or more are included.
• the hydraulic compound is preferably at least one selected from the group consisting of 3CaO ⁇ 3Al 2 O 3 ⁇ CaSO 4, 4CaO ⁇ Al 2 O 3 ⁇ Fe 2 O 3, and 2CaO ⁇ SiO 2, 3CaO ⁇ 3Al 2 O 3 ⁇ CaSO 4 , or a mixture of 3CaO ⁇ 3Al 2 O 3 ⁇ CaSO 4 and 4CaO ⁇ Al 2 O 3 ⁇ Fe 2 O 3 and 2CaO ⁇ SiO 2 is more preferred, and 3CaO ⁇ 3Al 2 O 3 ⁇ CaSO 4 is particularly preferred.
• the anhydrous gypsum referred to in the present invention is represented as CaSO 4 .
• Examples of the CaO raw material include limestone and slaked lime.
• Examples of the Al 2 O 3 raw material include bauxite and aluminum residual ash.
• Examples of the Fe 2 O 3 raw material include copper calami and commercially available iron oxide.
• Examples of the SiO 2 raw material include silica.
• Examples of the CaSO 4 raw material include dihydrate gypsum, hemihydrate gypsum, and anhydrous gypsum. These raw materials may contain impurities, but are not particularly problematic as long as the effects of the present invention are not impaired.
• Examples of impurities include MgO, TiO 2 , ZrO 2 , MnO, P 2 O 5 , Na 2 O, K 2 O, Li 2 O, sulfur, fluorine, and chlorine.
• a mixture of a CaO raw material, a CaSO 4 raw material, and at least one raw material selected from the group consisting of an Al 2 O 3 raw material, an Fe 2 O 3 raw material, and an SiO 2 raw material is heat-treated.
• the method is not particularly limited. For example, it is preferably fired at a temperature of 1000 to 1600 ° C. using an electric furnace or kiln, and more preferably 1200 to 1500 ° C. If the temperature is lower than 1000 ° C, it may be difficult to ensure the fluidity of the concrete immediately after mixing, or the initial strength may not be sufficiently developed. If the temperature exceeds 1600 ° C, anhydrous gypsum may decompose or the initial strength may not be sufficiently developed. It may be enough.
• the heat treatment time depends on the temperature, the holding time at the maximum temperature is preferably 0 to 2.0 hours, more preferably 0.25 to 1.75 hours.
• the content of each component in the obtained heat-treated product is preferably in the following range.
• the content of free lime is 10 to 70 parts, preferably 20 to 60 parts, out of a total of 100 parts of free lime, hydraulic compound and anhydrous gypsum.
• the content of the hydraulic compound is 10 to 50 parts, preferably 20 to 30 parts, out of a total of 100 parts of free lime, hydraulic compound and anhydrous gypsum.
• the content of anhydrous gypsum is 10 to 60 parts, preferably 20 to 50 parts, in a total of 100 parts of free lime, hydraulic compound and anhydrous gypsum.
• the content of calcium carbonate is preferably 0.1 to 10 parts, more preferably 1 to 5 parts, out of a total of 100 parts of free lime, hydraulic compound and anhydrous gypsum. Outside the above range, there may be little improvement in the slump immediately after kneading or the strength development may be reduced.
• each of the above components can be confirmed by a conventional analysis method.
• the pulverized sample can be applied to a powder X-ray diffractometer to confirm the generated minerals and analyze the data by the Rietveld method to quantify each component.
• the amount of each component can also be obtained by calculation based on the identification result of the chemical component and powder X-ray diffraction.
• the content of calcium carbonate can be quantified from a change in weight accompanying the decarboxylation of calcium carbonate by a differential thermal balance (TG-DTA), differential thermal calorimetry (DSC), or the like.
• Fineness of early demolding material of the present invention is preferably 2500 ⁇ 9000cm 2 / g in Blaine specific surface area, more preferably 3500 ⁇ 9000cm 2 / g. If it is less than 2500 cm ⁇ 2 > / g, the initial strength may be insufficiently increased, or it may be expanded after a long period of time to decrease the strength. Moreover, when it exceeds 9000 cm ⁇ 2 > / g, the fluidity
• a CaO raw material, an Al 2 O 3 raw material, and at least one raw material selected from the group consisting of an Al 2 O 3 raw material, an Fe 2 O 3 raw material, and a SiO 2 raw material When the mixture is heat-treated, and the heat-treated product containing free lime, hydraulic compound and anhydrous gypsum is mixed with fine-grain Portland cement and / or fine-grain quicklime and / or fine-grained anhydrous gypsum, the initial strength is exhibited. This is preferable because of improved properties.
• the fine particle Portland cement preferably has an average particle size of 6 ⁇ m or less, and more preferably 0.1 ⁇ m or more.
• the average particle size can be measured with a laser diffraction particle size distribution meter.
• the fine-portion Portland cement those obtained by pulverizing and classifying various Portland cements such as normal, early strength, super early strength, low heat, and moderate heat can be used.
• the proportion of the fine particle Portland cement is not particularly limited, but usually 40 parts or less is preferable in the total 100 parts of free lime, hydraulic compound, anhydrous gypsum and fine particle Portland cement, and more preferably 10 to 30 parts. If it exceeds 40 parts, the initial strength may be lowered.
• Fine particulate quicklime can be used by pulverizing limestone or slaked lime to obtain quicklime, and the average particle size is preferably 20 ⁇ m or less, more preferably 15 ⁇ m or less, and usually 0.1 ⁇ m or more. Is preferred.
• the fine anhydrous gypsum natural anhydrous gypsum, dihydrate gypsum, hemihydrate gypsum and the like can be used by pulverization, and the average particle diameter is preferably 20 ⁇ m or less, more preferably 15 ⁇ m or less, and usually 0. 1 ⁇ m or more is preferable.
• the proportion of the fine calcium oxide and / or fine anhydrous gypsum is not particularly limited, but usually 60 parts or less is preferable in the total 100 parts of the heat-treated product and the fine calcium oxide and / or fine anhydrous gypsum. If the amount exceeds 60 parts, the fluidity of the concrete may decrease and it may be difficult to fill the formwork, or the initial strength may decrease. Further, the proportion of the fine lime and / or fine anhydrous gypsum is preferably 10 parts or more in a total of 100 parts of the heat-treated product and the fine lime and / or fine anhydrous gypsum. In the present invention, the average particle size of the fine particle Portland cement, fine particle quicklime and fine particle anhydrous gypsum is measured using a laser diffraction particle size distribution meter and dispersed using an ultrasonic device.
• a CaO raw material, a CaSO 4 raw material, and at least one raw material selected from the group consisting of an Al 2 O 3 raw material, an Fe 2 O 3 raw material, and a SiO 2 raw material are mixed.
• the initial strength is improved by adding glycerin to heat-treated products obtained by heat-treating them, or those obtained by adding fine-grain Portland cement and / or fine-grain quicklime and / or fine-grained anhydrous gypsum to the heat-treated products.
• glycerin to heat-treated products obtained by heat-treating them, or those obtained by adding fine-grain Portland cement and / or fine-grain quicklime and / or fine-grained anhydrous gypsum to the heat-treated products.
• Glycerin used in the present invention is a compound represented by the chemical formula C 3 H 8 O 3 , chemical name 1,2,3-propanetriol or glycerol.
• the ratio of glycerin to be added to the heat-treated product is not particularly limited, but it is preferably 0 in a total of 100 parts of the heat-treated product or the heat-treated product with fine quicklime and / or fine anhydrous gypsum and glycerin. 1 to 10 parts, more preferably 1 to 5 parts. If it is less than 0.1 part, the initial strength enhancement effect and the improvement of the latency may not be obtained, and if it exceeds 10 parts, the fluidity of the concrete may be deteriorated.
• glycerin is added to a heat-treated product or a mixture of fine-ported Portland cement and / or fine-particle quicklime and / or fine-particle anhydrous gypsum, and then pulverized simultaneously to adhere to the surface of the pulverized product. From the viewpoint of sex.
• the amount of the early demolding material of the present invention is not particularly limited because it varies depending on the blending of concrete, but it is 2 to 15 parts in 100 parts of a cement composition comprising cement and early demolding material. 12 parts are preferred. Within the above range, an effect of increasing the compressive strength may be obtained.
• the cement used in the present invention is usually at least one selected from the group consisting of various Portland cements such as early strength, ultrahigh strength, low heat, and moderate heat, and slag, fly ash, and silica.
• various Portland cements such as early strength, ultrahigh strength, low heat, and moderate heat
• slag, fly ash, and silica examples include various mixed cements mixed with seeds, and filler cement mixed with limestone powder.
• the use of mixed cement is preferable because the environmental load is small and the strength enhancement effect is high when the early demolding material of the present invention is used.
• the curing conditions from concrete placement to demolding are preferably as follows.
• the steam curing temperature from casting of concrete to demolding is 70 ° C. or lower, and preferably 60 ° C. or lower. When it is cured at a temperature exceeding 70 ° C., the concrete may be cracked. In general, the steam curing temperature is preferably 40 ° C. or higher.
• the compression strength may not be sufficiently developed and may not be removed from the mold. If the maturity exceeds 320 ° C. ⁇ hr, the time required for production may be too long, which may be uneconomical. .
• the maturity from casting to demolding is more preferably 230 to 300 ° C.hr.
• water reducing agent in addition to sand and gravel, water reducing agent, high performance water reducing agent, AE water reducing agent, high performance AE water reducing agent, fluidizing agent, antifoaming agent, thickener, rust preventive agent, antifreeze agent, shrinkage reducing agent , Polymer emulsions, setting modifiers, cement hardeners, clay minerals such as bentonite, ion exchangers such as zeolite, siliceous fine powder, calcium carbonate, calcium hydroxide, gypsum, calcium silicate, steel fibers, etc.
• the organic material include fibrous substances such as vinylon fiber, acrylic fiber, and carbon fiber.
• Example 1 A CaO raw material, a CaSO 4 raw material, and at least one selected from the group consisting of an Al 2 O 3 raw material, an Fe 2 O 3 raw material, and a SiO 2 raw material, which are described in “Usage materials” described below, were mixed. .
• the obtained mixture was heat-treated in the atmosphere at 1350 ° C. for 0.5 hours using an electric furnace, and the obtained heat-treated product was pulverized with a ball mill to prepare early mold release materials (A to H).
• the early mold release material (I) which added the fine particle normal Portland cement to the ground product of the heat-treated product was prepared.
• an early demolding material (at) was prepared by adding glycerin to a heat-treated product or a mixture of the heat-treated product, fine lime and fine gypsum and pulverizing with a ball mill.
• early release materials and expansion materials for commercial products A to C early mold release material (J) in which fine particle ordinary Portland cement is added to commercial product B, and glycerin added to commercial product A What added only glycerin was used as a comparative example.
• the composition and content of each component in the heat-treated product were determined by powder X-ray diffraction and elemental analysis.
• CaO raw material Calcium carbonate (fine limestone powder), 100 mesh, commercially available Al 2 O 3 raw material: bauxite, 90 ⁇ m sieve passage rate 100%, commercially available Fe 2 O 3 raw material: iron oxide powder, Blaine specific surface area 3000 cm 2 / g , Commercially available SiO 2 raw material: silica powder, brane specific surface area 3000 cm 2 / g, commercially available CaSO 4 raw material: dihydrate gypsum, brane specific surface area 5000 cm 2 / g, commercially available cement: ordinary Portland cement, commercial product, density 3 .16 g / cm 3 Fine particle ordinary Portland cement: average particle diameter 3 ⁇ m, density 3.16 g / cm 3 Fine particle quicklime (1): CaO content 97%, average particle size 10 ⁇ m, commercial fine particle anhydrous gypsum (1): natural anhydrous gypsum, average particle size 8 ⁇ m, commercial fine particle quicklime (2): CaO content 97%, average Particle size
• Early mold release material A 21 parts of free lime, 32 parts of Yelimite, 47 parts of anhydrous gypsum, density 2.90 g / cm 3 , Blaine specific surface area 3500 cm 2 / g.
• Early mold release material B A product obtained by pulverizing the early mold release material A to a brain specific surface area of 6000 cm 2 / g.
• Early mold release material C A material obtained by pulverizing the early mold release material A to a brain specific surface area of 9000 cm 2 / g.
• Early demolding material D 32 parts of free lime, 21 parts of Yelimite, 5 parts of C 4 AF, 5 parts of C 2 S, 37 parts of anhydrous gypsum, density 2.98 g / cm 3 , brain specific surface area 3500 cm 2 / g.
• Early mold release material E 50 parts of free lime, 10 parts of Yelite, 5 parts of C 4 AF, 5 parts of C 2 S, 30 parts of anhydrous gypsum, density of 3.05 g / cm 3 , and Blaine specific surface area of 3500 cm 2 / g.
• Early demolding material F Early demolding material A is placed in an alumina crucible and set in an electric furnace, and carbon dioxide is flowed at 0.05 L (liter) / min per liter of the internal volume of the electric furnace, while heating temperature is 600 ° C., 30 Synthesized by minute reaction. 20 parts of free lime, 32 parts of Yelimite, anhydrous gypsum 47, 1 part of calcium carbonate, density 2.90 g / cm 3 , Blaine specific surface area 6000 cm 2 / g.
• Early mold release material G 70 parts of free lime, 20 parts of Yelimite, 10 parts of anhydrous gypsum, a density of 3.20 g / cm 3 , and a brain specific surface area of 3500 cm 2 / g.
• Early mold release material H 10 parts of free lime, 50 parts of Yelimite, 40 parts of anhydrous gypsum, density 2.85 g / cm 3 , Blaine specific surface area 3500 cm 2 / g.
• Early demolding material I 80 parts of early demolding material A was blended with 20 parts of fine ordinary Portland cement with an average particle size of 3 ⁇ m, density 2.95 g / cm 3 , and Blaine specific surface area 4400 cm 2 / g.
• Early demolding material J 80 parts of commercial product B with 20 parts of fine ordinary Portland cement with an average particle size of 3 ⁇ m, density 2.95 g / cm 3 , Blaine specific surface area 4400 cm 2 / g.
• Early demolding material a 97 parts of heat-treated product composed of 21 parts of free lime, 32 parts of Yelimite and 47 parts of anhydrous gypsum and 3 parts of glycerin were mixed and pulverized to prepare a brain specific surface area of 3500 cm 2 / g.
• Early mold release material b 97 parts of the heat-treated product used in the early mold release material A and 3 parts of glycerin were mixed and pulverized to prepare a brain specific surface area of 6000 cm 2 / g.
• Early mold release material c 97 parts of the heat-treated product used in the early mold release material A and 3 parts of glycerin were mixed and pulverized to prepare a brain specific surface area of 9000 cm 2 / g.
• Early demolding material d 97 parts of heat-treated product composed of 30 parts of free lime, 20 parts of Yelimite, 5 parts of C 4 AF, 5 parts of C 2 S, 40 parts of anhydrous gypsum and 3 parts of glycerin are mixed and ground to a Blaine specific surface area of 3500 cm 2 / g Prepared.
• Early demolding material e Mix and grind 97 parts of heat-treated product consisting of 50 parts of free lime, 10 parts of Yelimite, 5 parts of C 4 AF, 5 parts of C 2 S, 30 parts of anhydrous gypsum and 3 parts of glycerin, to a Blaine specific surface area of 3500 cm 2 / g Prepared.
• Early demolding material f 97 parts of calcined product composed of 30 parts of free lime, 10 parts of Yelimite and 60 parts of anhydrous gypsum and 3 parts of glycerin were mixed and pulverized to prepare a brain specific surface area of 4000 cm 2 / g.
• Early demolding material g 97 parts of heat-treated product composed of 70 parts of free lime, 20 parts of Yelimite and 10 parts of anhydrous gypsum (Blaine specific surface area 3500 cm 2 / g) and 3 parts of glycerin were mixed and pulverized to prepare a Blaine specific surface area of 3500 cm 2 / g. What you did.
• Early demolding material h 97 parts of heat-treated product consisting of 10 parts of free lime, 50 parts of Yelimite and 40 parts of anhydrous gypsum and 3 parts of glycerin were mixed and pulverized to prepare a brain specific surface area of 3500 cm 2 / g.
• Early demolding material i prepared by pulverizing a heat-treated product composed of 21 parts of free lime, 32 parts of Yelimite and 47 parts of anhydrous gypsum to a Blaine specific surface area of 3500 cm 2 / g, and mixing 97 parts of pulverized product and 3 parts of glycerin.
• Early demolding material j 70 parts heat-treated product composed of 21 parts free lime, 32 parts Yelimite, 47 parts anhydrous gypsum, 13.5 parts fine particulate quicklime (1), 13.5 parts fine particulate anhydrous gypsum (1), glycerin 3 Part was mixed and pulverized to prepare a brain specific surface area of 6000 cm 2 / g.
• Early demolding material k 50 parts of heat-treated product composed of 21 parts of free lime, 32 parts of Yelimeite, 47 parts of anhydrous gypsum, 23.5 parts of fine particle quick lime (1), 23.5 parts of fine particle anhydrous gypsum (1), glycerin 3 Part was mixed and pulverized to prepare a brain specific surface area of 6000 cm 2 / g.
• Early demolding material l 40 parts heat-treated product composed of 21 parts free lime, 32 parts Yelimeite, 47 parts anhydrous gypsum, 28.5 parts fine particulate lime (1), 28.5 parts fine particulate anhydrous gypsum (1), glycerin 3 Part was mixed and pulverized to prepare a brain specific surface area of 6000 cm 2 / g.
• Early demolding material m 30 parts heat-treated product consisting of 21 parts free lime, 32 parts Yelimite, 47 parts anhydrous gypsum, 33.5 parts fine particulate quicklime (1), 33.5 parts fine particulate anhydrous gypsum (1), glycerin 3 Part was mixed and pulverized to prepare a brain specific surface area of 6000 cm 2 / g.
• Early mold release material n 48.5 parts fine particle quick lime (1), 48.5 parts fine particle anhydrous gypsum (1) and 3 parts glycerin were mixed and pulverized to prepare a brain specific surface area of 5000 cm 2 / g.
• Early demolding material o 50 parts heat-treated product composed of 21 parts free lime, 32 parts Yelimite, 47 parts anhydrous gypsum, 47 parts fine particulate lime (1) and 3 parts glycerin to a Blaine specific surface area of 6000 cm 2 / g Prepared.
• Early mold release material p 50 parts of a heat-treated product composed of 21 parts of free lime, 32 parts of Yelimite and 47 parts of anhydrous gypsum, 47 parts of fine anhydrous gypsum (1), and 3 parts of glycerin are mixed and pulverized, and a brain specific surface area of 6000 cm 2 / g Prepared to.
• Early demolding material q 50 parts heat-treated product composed of 21 parts free lime, 32 parts Yelimite, 47 parts anhydrous gypsum, 23.5 parts fine particulate quicklime (2), 23.5 parts fine particulate anhydrous gypsum (2), glycerin 3 Part was mixed and pulverized to prepare a brain specific surface area of 6000 cm 2 / g.
• Early demolding material r 99.9 parts of heat-treated product composed of 21 parts of free lime, 32 parts of Yelimite and 47 parts of anhydrous gypsum and 0.1 part of glycerin were mixed and pulverized to prepare a Blaine specific surface area of 3500 cm 2 / g.
• Early demolding material s 99 parts of heat-treated product composed of 21 parts of free lime, 32 parts of Yelimite and 47 parts of anhydrous gypsum and 1 part of glycerin were mixed and pulverized to prepare a brain specific surface area of 3500 cm 2 / g.
• Early demolding material t 90 parts of heat-treated product composed of 21 parts of free lime, 32 parts of Yelimite and 47 parts of anhydrous gypsum and 10 parts of glycerin were mixed and pulverized to prepare a brain specific surface area of 3500 cm 2 / g.
• Commercial product A Commercially available early demolding material containing 50 parts of quicklime, 20 parts of calcium silicate, and 30 parts of anhydrous gypsum. Blaine specific surface area 4500 cm 2 / g. Anhydrite is added later to the clinker.
• Commercial product B ettringite-based expansion material, density 2.95 g / cm 3 , brain specific surface area 2800 cm 2 / g.
• Commercial product C ettringite / lime composite expanded material, density 3.08 g / cm 3 , brain specific surface area 2800 cm 2 / g.
• the specimen was placed in 20 ° C. water to stabilize the temperature, and the base length was measured at a material age of 1 day. Furthermore, it hardened
• Example 2 Using the early mold release material A, early mold release material B, early mold release material a, early mold release material b, or early mold release material k, a part of the cement is replaced by the amount of blast furnace slag and / or fly ash shown in Table 2. The experiment was performed in the same manner as in Experimental Example 1 except that The results are shown in Table 2. In addition, what mixed glycerol with the commercial item A or the commercial item A was also evaluated.
• Fly ash Tohoku fly ash type II, Blaine specific surface area 4000 cm 2 / g, density 2.23 g / cm 3
• Slag Blast furnace slag, manufactured by Sumikin Mining Co., Ltd., Smitment, Blaine specific surface area 4000 cm 2 / g, density 2.91 g / cm 3
• Example 3 Except for using early demolding material A or early demolding material a, replacing slag with 100 kg / m 3 and fly ash with 50 kg / m 3 cement, and changing steam curing conditions and maturity as shown in Table 3 The same operation as in Example 2 was performed. The results are shown in Table 3.
• Example 4 Steam curing conditions were 20 minutes at 20 ° C., 40 minutes preheating, 30 minutes warming, 3 hours at 50 ° C., 30 minutes cooling, and 100 parts of cement composition consisting of cement and early demolding material The experiment was performed in the same manner as in Experimental Example 3 except that the amount used was changed as shown in Table 4. The results are shown in Table 4.
• the early demolding material of the present invention is useful for the production of concrete products, and the production method using the early demolding material of the present invention can be used as a method for increasing the productivity of concrete products with a small environmental load. It should be noted that Japanese Patent Application No. 2011-226165 filed on October 13, 2011 and Japanese Patent Application No. 2011-289924 filed on December 28, 2011, claims, and abstracts The entire contents are hereby incorporated by reference as the disclosure of the specification of the present invention.

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