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
  • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators or 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 or 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
  • 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
  • C04B7/00—Hydraulic cements
  • C04B7/32—Aluminous 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
  • C04B7/345—Hydraulic cements not provided for in one of the groups C04B7/02 - C04B7/34

Definitions

• the present invention relates to a cement material, a composition containing the material, and a cured product.
• Patent Document 1 In order to impart rapid hardening to cement materials, it has long been considered to add calcium aluminate or even gypsum to Portland cement (Patent Document 1).
• pot life is also important as a required performance of cement materials. Considering the construction time and cleaning time of the equipment used, it is desirable to ensure a pot life of at least 10 minutes, preferably 15 minutes or more. However, ensuring a long pot life delays the curing time, making it difficult to meet the required strength at one hour of material age.
• ultra-fast hardening cement compositions made by adding metal sulfates, fly ash, etc. to calcium aluminates and gypsum to ensure fluidity are known.
• Patent Documents 2 to 4 ultra-fast hardening cement in which lithium carbonate is blended with calcium aluminate and gypsum
• Patent Document 6 ultra-fast hardening cement in which calcium aluminate, anhydrous gypsum, lithium carbonate, and slaked lime are blended in Portland cement have also been proposed (Patent Document 6). ).
• the present invention aims to provide a cement material that can obtain a certain handling time even at low temperatures and has a high strength development property in a short time.
• the present inventors have found that the problem can be solved by using a cement material containing cement, specific calcium aluminate, specific alumina cement, gypsum, and aggregate.
• the inventors have discovered that the problem can be solved, leading to the present invention. That is, the present invention is as follows.
• the alumina cement is an alumina cement containing SO 3 , ZrO 2 and P 2 O 5 , The total amount of SO 3 , ZrO 2 and P 2 O 5 in the alumina cement is 0.01% by mass or more and 2.1% by mass or less,
• a cement material in which the content ratio of P 2 O 5 (P 2 O 5 /(SO 3 +ZrO 2 +P 2 O 5 )) in the alumina cement is 10% by mass or more and 45% by mass or less.
• the CaO/Al 2 O 3 molar ratio of the alumina cement is 0.5 or more and 2.0 or less, and the content ratio of the alumina cement is 30 parts by mass or more and 100 parts by mass with respect to 100 parts by mass of the cement.
• the cement material according to [1] above, wherein the cement material is [3] The CaO/Al 2 O 3 molar ratio of the calcium aluminate is 1.3 or more and 3.0 or less, and the content ratio of the calcium aluminate is 2 parts by mass or more with respect to 100 parts by mass of the cement.
• Cement material according to [1] or [2] above which is 30 parts by mass or less
• [5] A cured product using the cement composition according to [4] above.
• the present invention it is possible to maintain fluidity even at low temperatures, so that a certain handling time can be obtained, and furthermore, to provide a cement material that has a high strength development property in a short time, that is, an initial strength development property. I can do it.
• the cement material of the present invention is a cement material containing cement, calcium aluminate, alumina cement, gypsum, and aggregate, in which the vitrification rate of the calcium aluminate is 90% or more, and the alumina cement has a vitrification rate of 90% or more.
• the vitrification rate is 1% or more and less than 90%
• the alumina cement is an alumina cement containing SO 3 , ZrO 2 and P 2 O 5
• the alumina cement contains SO 3 , ZrO 2 and P 2
• the total amount of O 5 is 0.01% by mass or more and 2.1% by mass or less
• the content ratio of P 2 O 5 (P 2 O 5 / (SO 3 + ZrO 2 + P 2 O 5 )) in the alumina cement is It is 10% by mass or more and 45% by mass or less.
• cement The cement used in the present invention is not particularly limited, and includes various Portland cements such as normal, early strength, ultra early strength, low heat, and medium heat, and in addition to these Portland cements, blast furnace slag, fly ash, silica fume, etc. These include various types of mixed cement, environmentally friendly cement (ecocement) made from municipal waste incineration ash and sewage sludge incineration ash, commercially available fine particle cement, and white cement. It is also possible to use it in a format. Further, it is also possible to use a cement that has been adjusted by increasing or decreasing the amount of components (for example, gypsum, etc.) normally used in cement. Furthermore, combinations of two or more of these can also be used. In the present invention, it is preferable to select ordinary Portland cement or early-strength Portland cement from the viewpoint of high strength development and increasing adhesive strength. Note that in this specification, cement does not include alumina cement.
• the cement used in the present invention has a Blaine specific surface area value (hereinafter also simply referred to as "Blaine value”) of 2,500 cm 2 /g or more and 7,000 cm 2 /g. It is preferably below, more preferably 2,750 cm 2 /g or more and 6,000 cm 2 /g or less, and even more preferably 3,000 cm 2 /g or more and 4,500 cm 2 /g or less.
• the Blaine specific surface area value is determined in accordance with JIS R 5201:2015 (physical testing method for cement).
• Calcium aluminate used in the present invention is a general term for compounds containing CaO and Al 2 O 3 as main components, and has a vitrification rate of 90% or more, preferably 95% or more. If the vitrification rate is less than 90%, a certain handling time cannot be obtained, and the ability of cement concrete to develop high strength in a short period of time, that is, the ability to develop initial strength, decreases.
• the crystalline portion of calcium aluminate is not particularly limited, examples of minerals produced include calcium aluminates such as 3CaO.Al 2 O 3 and 12CaO.7Al 2 O 3 . be done.
• impurity compounds examples include gehlenite, calcium aluminoferrite, calcium ferrite, etc. caused by subcomponents derived from raw materials and unavoidable impurities.
• the vitrification rate of calcium aluminate can be adjusted by adjusting the heating melting temperature and cooling method in the method described below.
• the vitrification rate can be determined by powder X-ray diffraction/Rietveld analysis. That is, a predetermined amount of an internal standard substance such as aluminum oxide or magnesium oxide is added to a sample, thoroughly mixed in an agate mortar, etc., and then powder X-ray diffraction measurement is performed. By analyzing the measurement results with quantitative software, the amount of mineral composition generated is determined, and the remaining amount is taken as the sample vitrification rate.
• the quantitative software "SIROQUANT" manufactured by Sietronics, etc. can be used as the quantitative software.
• a method for obtaining calcium aluminate includes heat-treating a CaO raw material, an Al 2 O 3 raw material, etc. using a rotary kiln, an electric furnace, or the like. Specifically, there is a method in which the raw materials are mixed at a predetermined ratio, heated and melted using an electric furnace, and then rapidly cooled by contacting with compressed air or water.
• CaO raw materials for producing calcium aluminate include calcium carbonate such as limestone and shells, calcium hydroxide such as slaked lime, and calcium oxide such as quicklime.
• examples of the Al 2 O 3 raw material include bauxite and an industrial byproduct called aluminum residual ash.
• calcium aluminate When calcium aluminate is obtained industrially, it may contain impurities. Specific examples include SiO 2 , Fe 2 O 3 , MgO, TiO 2 , MnO, Na 2 O, K 2 O, Li 2 O, S, P 2 O 5 , and F.
• impurities include SiO 2 , Fe 2 O 3 , MgO, TiO 2 , MnO, Na 2 O, K 2 O, Li 2 O, S, P 2 O 5 , and F.
• impurities include SiO 2 , Fe 2 O 3 , MgO, TiO 2 , MnO, Na 2 O, K 2 O, Li 2 O, S, P 2 O 5 , and F.
• the presence of these impurities does not pose any particular problem as long as it does not substantially impede the object of the present invention. Specifically, no particular problem arises as long as the total amount of these impurities is 10% or less.
• the molar ratio of CaO to Al 2 O 3 (CaO/Al 2 O 3 molar ratio) in the calcium aluminate of the present invention is preferably in the range of 1.3 or more and 3.0 or less, and 1.5 or more and 2. More preferably, the range is .0 or less.
• the CaO/Al 2 O 3 molar ratio is 1.3 or more, sufficient initial strength development is likely to be obtained.
• the CaO/Al 2 O 3 molar ratio is 3.0 or less, a constant handling time can be easily ensured.
• the calcium aluminate of the present invention preferably has a loss on ignition of 1% or more as defined in JIS R 5202:2015, and more preferably has a loss on ignition of 2% or more. .
• the ignition loss of calcium aluminate is 1% or more, a certain amount of handling time can be obtained, and the occurrence of "splatter" can be easily suppressed.
• the method of increasing the ignition loss to 1% or more is not particularly limited, but examples include a method of supplying moisture or moisture, a method of supplying carbon dioxide gas, and the like.
• the particle size of the calcium aluminate of the present invention is not particularly limited, but usually the Blaine value is preferably 3,000 cm 2 /g or more and 9,000 cm 2 /g or less, 4,000 cm 2 /g or more 8, 000 cm 2 /g or less is more preferable.
• the Blaine value of calcium aluminate is 3,000 cm 2 /g or more, it is easy to sufficiently develop initial strength. Further, since the Blaine value of calcium aluminate is 9,000 cm 2 /g or less, a certain handling time can be easily ensured.
• the content ratio of calcium aluminate of the present invention is 2 parts by mass or more and 30 parts by mass or less, based on 100 parts by mass of cement in the cement material, from the viewpoint of ensuring a certain handling time and improving initial strength development.
• the content is preferably 5 parts by mass or more and 20 parts by mass or less.
• the alumina cement used in the present invention is produced by mixing CaO raw materials, Al 2 O 3 raw materials, SO 3 raw materials, ZrO 2 raw materials, P 2 O 5 raw materials, etc., and firing the mixture in a kiln or the like, or melting it in an electric furnace or the like. It is a general term for substances with hydration activity mainly composed of CaO and Al 2 O 3 obtained by cooling, and also has a vitrification rate of 1% or more and less than 90%, and has a fast curing time. It is a material with high initial strength development.
• the vitrification rate of alumina cement can be adjusted by adjusting the heating and melting temperature and the cooling method, and is preferably 5% or more and less than 60%.
• the CaO/Al 2 O 3 molar ratio of the alumina cement used in the present invention is preferably 0.5 or more and 2.0 or less, more preferably 0.7 or more and 1.8 or less.
• the CaO/Al 2 O 3 molar ratio is within the above range, the curing time can be further shortened and the initial strength development property can be improved.
• the alumina cement used in the present invention contains SO 3 , ZrO 2 and P 2 O 5 as chemical components.
• the content range of each component in the alumina cement is preferably 0.01% by mass or more and 1.8% by mass or less, more preferably 0.05 to 1.0% by mass. preferable.
• the total amount of SO 3 , ZrO 2 and P 2 O 5 in the alumina cement is 0.01% by mass or more and 2.1% by mass or less. From the viewpoint of securing a certain handling time and increasing initial strength development, the content is preferably 0.07% by mass or more and 1.7% by mass or less, and 0.1% by mass or more and 1.5% by mass or less. is more preferable.
• the content ratio of P 2 O 5 is 10% by mass or more and 45% by mass or less. From the viewpoint of securing a certain handling time and increasing initial strength development, the content is preferably 12% by mass or more and 43% by mass or less, and more preferably 15% by mass or more and 40% by mass or less. Furthermore, in the present invention, the contents of SO 3 , ZrO 2 , and P 2 O 5 can be measured by X-ray fluorescence diffraction (XRF), and from the respective contents obtained by measurement, it is possible to determine the content of SO 3 , ZrO 2 , and P 2 O 5 . The content ratio can be determined.
• XRF X-ray fluorescence diffraction
• the content ratio of the alumina cement of the present invention should be 30 parts by mass or more and 100 parts by mass or less with respect to 100 parts by mass of cement in the cement material, from the viewpoint of ensuring a certain handling time and improving initial strength development. is preferable, and more preferably 50 parts by mass or more and 90 parts by mass or less.
• Alumina cement is commercially available from various companies, and representative examples include "Denka Alumina Cement No. 1" and “Denka High Alumina Cement” manufactured by Denka Corporation, "Asahi Alumina Cement No. 1" manufactured by AGC Ceramics, and "Asahi Examples include “Fonju” and crushed products thereof.
• the alumina cement of this embodiment is made of calcium aluminoferrite such as 4CaO.Al 2 O 3 .Fe 2 O 3 , 6CaO.2Al 2 O 3.Fe 2 O 3 , 6CaO.Al 2 O 3 . ⁇ Calcium ferrite such as Fe 2 O 3 and CaO ⁇ Fe 2 O 3 , calcium aluminosilicate such as Gehlenite 2CaO ⁇ Al 2 O 3 ⁇ SiO 2 , anorthite CaO ⁇ Al 2 O 3 ⁇ 2SiO 2 , melvinite 3CaO ⁇ MgO ⁇ 2SiO 2 , akermanite 2CaO ⁇ MgO ⁇ 2SiO 2 , calcium magnesium silicate such as monticerite CaO ⁇ MgO ⁇ SiO 2 , tricalcium silicate 3CaO ⁇ SiO 2 , dicalcium silicate 2CaO ⁇ SiO 2 , rankinite 3CaO ⁇ 2Si
• alumina cement When alumina cement is obtained industrially, it may contain impurities. Specific examples include SiO 2 , Fe 2 O 3 , MgO, TiO 2 , MnO, Na 2 O, K 2 O, SrO, Cr 2 O 3 , Nb 2 O 5 , Ga 2 O 3 , Y 2 Examples include O 3 , ThO 2 , NiO, SeO 2 , Li 2 O, Rb 2 O, As 2 O 3 , ZnO, S, Cl and F. The presence of these impurities does not pose any particular problem as long as it does not substantially impede the object of the present invention. Specifically, no particular problem arises as long as the total amount of these impurities is 10% or less.
• the particle size of the alumina cement of the present invention is not particularly limited, but is usually in the Blaine value range of 3,000 cm 2 /g or more and 9,000 cm 2 /g or less, and 4,000 cm 2 /g or more 8 ,000 cm 2 /g or less is more preferable. When it is 3,000 cm 2 /g or more, initial strength development is good, and when it is 9,000 cm 2 /g or less, handling is easy.
• the gypsum used in the present invention is a general term for anhydrous, hemihydrous, or dihydric gypsum, and is not particularly limited, but from the viewpoint of strength development, it is preferable to use anhydrous gypsum or hemihydrate gypsum. Preferably, the use of anhydrite is more preferable.
• the particle size of gypsum is not particularly limited, it is usually preferably 3,000 or more and 9,000 cm 2 /g or less, more preferably 4,000 or more and 8,000 cm 2 /g or less in Blaine value. When it is 3,000 cm 2 /g or more, dimensional stability becomes good, and when it is 9,000 cm 2 /g or less, it is easy to ensure a certain handling time.
• the content ratio of gypsum is preferably 20 parts by mass or more and 120 parts by mass or less, based on 100 parts by mass of calcium aluminate in the cement material, from the viewpoint of ensuring a certain handling time and improving initial strength development. , more preferably 30 parts by mass or more and 110 parts by mass or less.
• aggregate As the aggregate used in the present invention, fine aggregates and coarse aggregates similar to those used for ordinary cement mortar and concrete can be used. Namely, river sand, river gravel, mountain sand, mountain gravel, crushed stone, crushed sand, limestone aggregate, lime sand, silica sand, colored sand, artificial aggregate, blast furnace slag aggregate, sea sand, sea gravel, artificial lightweight aggregate, and heavy aggregate can be used, and it is also possible to combine these.
• the content ratio of aggregate is preferably 40 parts by mass or more and 250 parts by mass or less, more preferably 50 parts by mass or more and 230 parts by mass or less, and 60 parts by mass with respect to 100 parts by mass of cement in the cement material. It is more preferably 1 part or more and 200 parts by mass or less.
• the content ratio of the alkali metal carbonate is preferably 1 part by mass or more and 6 parts by mass or less in solid content, more preferably 2 parts by mass or more and 5 parts by mass or less, based on 100 parts by mass of cement of the cement material. preferable.
• the content ratio of the alkali metal carbonate is within the above range, a certain handling time can be easily ensured, and strength development can be improved.
• the cement material of the present invention can contain fine siliceous powder from the viewpoint of ensuring a certain handling time and improving strength development.
• the siliceous fine powder include latent hydraulic substances such as fine granulated blast furnace slag powder, fly ash, and pozzolanic substances such as silica fume, of which silica fume is preferred.
• the type of silica fume is not limited, from the viewpoint of fluidity, it is more preferable to use silica fume containing 10% or less of ZrO 2 as an impurity or acidic silica fume.
• Acidic silica fume refers to silica fume that exhibits acidity, such that when 1 g of silica fume is stirred in 100 cc of pure water, the pH of the supernatant liquid is 5.0 or less.
• the degree of fineness of the siliceous fine powder is not particularly limited, but usually, the blast furnace slag fine powder and fly ash have a Blaine value of 3,000 cm 2 /g or more and 9,000 cm 2 /g or less.
• the BET specific surface area of silica fume is in the range of 20,000 cm 2 /g or more and 300,000 cm 2 /g or less.
• the content ratio of the siliceous fine powder is preferably 1 part by mass or more and 20 parts by mass or less, more preferably 2 parts by mass or more and 15 parts by mass or less, and 3 parts by mass or more and 12 parts by mass or less, per 100 parts by mass of cement in the cement material. Part or less is more preferable.
• the content of the siliceous fine powder is at least the above lower limit, a certain handling time can be easily ensured, and strength development can be improved. Furthermore, since the content of the siliceous fine powder is equal to or less than the above upper limit, it is easy to ensure a constant handling time.
• Set retarders may also be used in the present invention.
• the setting retarder from the viewpoint of ensuring a certain handling time, oxycarboxylic acid or a salt thereof is preferable, gluconic acid is more preferable as the oxycarboxylic acid, and sodium salt is more preferable as the salt.
• the content of the setting retarder is preferably 0.9 parts by mass or more and 6 parts by mass or less, and preferably 1.5 parts by mass or more and 5 parts by mass or less, based on 100 parts by mass of cement in the cement material. More preferred. When the content of the setting retarder is within the above range, a constant handling time can be easily ensured.
• an antifoaming agent within a range that does not adversely affect performance.
• Antifoaming agents are used for the purpose of suppressing the amount of air involved during kneading and mixing.
• the type of antifoaming agent is not particularly limited as long as it does not significantly adversely affect the strength characteristics of the hardened mortar, and both liquid and powder forms can be used. Examples include polyether antifoaming agents, polyhydric alcohol antifoaming agents such as esterified polyhydric alcohols and alkyl ethers, alkyl phosphate antifoaming agents, and silicone antifoaming agents.
• the content ratio of the antifoaming agent is preferably 0.002 parts by mass or more and 0.5 parts by mass or less, and 0.005 parts by mass or more and 0.45 parts by mass or less, based on 100 parts by mass of cement in the cement material. More preferably, the amount is 0.01 part by mass or more and 0.4 part by mass or less.
• the content of the antifoaming agent is at least the above lower limit, the antifoaming effect can be sufficiently exhibited. Further, since the content ratio of the antifoaming agent is at most the above upper limit value, it is easy to ensure a constant handling time.
• gas foaming substances water reducing agents, setting modifiers, AE agents, rust preventive agents, water repellents, antibacterial agents, colorants, antifreeze agents, fine limestone powder, blast furnace Cold slag fine powder, sewage sludge incineration ash and its molten slag, municipal waste incineration ash and its molten slag, admixtures such as pulp sludge incineration ash, thickeners, shrinkage reducers, polymers, clays such as bentonite, sepiolite, etc. It is possible to use one or more of minerals and anion exchangers such as hydrotalcite within a range that does not substantially impede the object of the present invention.
• each material is not particularly limited, and each material may be mixed at the time of construction, or some or all of the materials may be mixed in advance.
• any existing device can be used, such as a tilting mixer, an omni mixer, a Henschel mixer, a V-type mixer, a Proshear mixer, a Nauta mixer, and the like.
• the cement composition of the present invention contains the above-described cement material of the present invention and water, and is obtained by kneading the cement material and water.
• the amount of mixing water in the present invention is not particularly limited as it changes depending on the purpose/application and the content ratio of each material, but it is 10 parts by mass or more and 70 parts by mass or less with respect to 100 parts by mass of the cement material. It is preferably 14 parts by mass or more and 65 parts by mass or less, and even more preferably 16 parts by mass or more and 60 parts by mass or less.
• Construction methods using the cement material of the present invention include adding a predetermined amount of water and mixing it and pouring it into the construction site, filling the mixed mortar with a pump, and blowing compressed air into the mixed mortar. Methods include spraying and painting with a plastering trowel.
• the kneading method includes, but is not particularly limited to, a method of putting the ingredients into a container such as a pail can and kneading with a hand mixer, a method of kneading using a mixer etc., a method of mixing by hand, etc.
• the cement composition of the present invention becomes a hardened product by being mixed and filled into a construction site. That is, a cured product made using the cement composition of the present invention is obtained.
• the mixture was blended and fired at 1,500°C to synthesize clinker, which was ground using a ball mill to a Blaine value of 3,000 cm 2 /g to produce alumina cement. Note that the contents of SO 3 , ZrO 2 , and P 2 O 5 were measured by fluorescent X-ray diffraction.
• (Measurement item) - Handling time The temperature of a cement composition obtained by mixing cement material and water in a 5°C environment was measured, and the time taken for the temperature to rise by 1°C from immediately after the cement composition was prepared was measured. The results are shown in Table 1. Note that the handling time is preferably 3 minutes or more, more preferably 10 minutes or more. Although the upper limit is not particularly specified, it may be about 30 minutes or less.
• ⁇ Compressive strength A cement composition obtained by mixing cement material and water in a 5°C environment is prepared, packed into a 4 x 4 x 16 cm mold, and the resulting hardened product is compressed after 30 minutes. The strength was measured. The results are shown in Table 1. Note that the compressive strength is preferably 10 N/mm 2 or more, more preferably 20 N/mm 2 or more.
• Example 2 No. 1 in Experimental Example 1 except that the alumina cement was prepared so that the content ratio of P 2 O 5 in the alumina cement was as shown in Table 2. It was carried out in the same manner as 1-3. The results of the measured handling time and compressive strength are also listed in Table 2.
• Example 4 No. 1 of Experimental Example 1 except that the contents of alumina cement and calcium aluminate were blended in the proportions shown in Table 4. It was carried out in the same manner as 1-3. The results of the measured handling time and compressive strength are also listed in Table 4.
• Example 5 No. 1 in Experimental Example 1 except that the aggregate content was blended in the ratio shown in Table 5. It was carried out in the same manner as 1-3. The results of the measured handling time and compressive strength are also listed in Table 5.
• the cement material of the present invention contains specific calcium aluminate and specific alumina cement, and by combining it with specific materials, a certain handling time can be obtained even at low temperatures, and the initial strength development property can be improved. It was confirmed that the
• the cement material of the present invention contains specific calcium aluminate and specific alumina cement, and when combined with specific materials, a certain handling time can be obtained even at low temperatures, and a cement that can obtain initial strength development properties. It becomes possible to provide a composition and a cured product. Therefore, it can be widely applied in the civil engineering and construction fields, such as fixing reinforcing bars to concrete structures used in water and sewage, agriculture and water, railways, electric power, roads, architecture, etc.

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• 2023
  • 2023-05-17 JP JP2024524328A patent/JPWO2023234041A1/ja active Pending
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