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, shrinkage compensating agents
  • C04B22/08—Acids or salts thereof
  • C04B22/10—Acids or salts thereof containing carbon in the anion
• • 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
  • 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
  • C04B22/142—Sulfates
  • C04B22/143—Calcium-sulfate
• • 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
  • C04B24/02—Alcohols; Phenols; Ethers
• • 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
  • C04B24/12—Nitrogen containing compounds organic derivatives of hydrazine
• • 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
  • C04B24/12—Nitrogen containing compounds organic derivatives of hydrazine
  • C04B24/122—Hydroxy amines
• • 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
  • C04B7/02—Portland 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
  • C04B7/00—Hydraulic cements
  • C04B7/36—Manufacture of hydraulic cements in general
  • C04B7/48—Clinker treatment
  • C04B7/52—Grinding ; After-treatment of ground cement
• • 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 a cement composition and a method for producing the same.
• Patent Document 1 in order to provide an admixture for mortar or concrete and a cement composition used in civil engineering structures and concrete secondary products that have the effect of increasing both 7-day strength and 28-day strength.
• Patent Document 2 which is an admixture containing trialkanolamine and diethylene glycol, and discloses a cement composition comprising cement and the admixture.
• Patent Document 2 when manufacturing buildings, civil engineering structures, and secondary concrete products, it is possible to overcome the drawback of low initial strength of fly ash and actively mix fly ash with the cement used.
• An object of the present invention is to provide a cement composition having high strength and excellent fluidity, and a method for producing the same.
• the present invention provides the following ⁇ 1> to ⁇ 7>.
• ⁇ 1> Ordinary Portland cement clinker containing 51 to 62% by mass of C 3 S and 7 to 10% by mass of C 4 AF calculated by the Borg formula, gypsum, limestone, and an auxiliary agent containing alkanolamine wherein the alkanolamine content in the total amount of the ordinary Portland cement clinker, the gypsum, and the auxiliary agent is 10 to 210 mg/kg, and the ordinary Portland cement clinker, the gypsum, the auxiliary agent, and the A cement composition having a limestone content of 3 to 10% by mass in the total amount of limestone, a lattice volume of the C 4 AF exceeding 0.4290 nm 3 , and a Blaine specific surface area of 2800 to 3500 cm 2 /g. .
• ⁇ 2> The cement composition according to ⁇ 1>, wherein the content of the auxiliary agent in the total amount of the ordinary Portland cement clinker, the gypsum, and the auxiliary agent is 80 to 350 mg/kg.
• ⁇ 3> The cement composition according to ⁇ 1> or ⁇ 2>, wherein the auxiliary agent contains an aliphatic polyhydric alcohol.
• ⁇ 4> ⁇ 1> to ⁇ 3 > wherein the content of the gypsum in the total amount of the ordinary Portland cement clinker, the gypsum, and the auxiliary agent is 0.7 to 2.8% by mass in terms of SO3
• the alkanolamine is at least one selected from the group consisting of diethanolisopropanolamine, triisopropanolamine, ethanoldiisopropanolamine, N-methyldiethanolamine, and Nn-butyldiethanolamine ⁇ 1> to ⁇ 4>
• the cement composition according to any one of ⁇ 6> The cement composition according to any one of ⁇ 3> to ⁇ 5>, wherein the aliphatic polyhydric alcohol is at least one selected from the group consisting of glycerin and diethylene glycol.
• the cement composition of the present invention comprises ordinary Portland cement clinker having 51 to 62% by mass of C 3 S and 7 to 10% by mass of C 4 AF calculated by the Borg formula, gypsum, limestone, and alkanolamine.
• the content of alkanolamine in the total amount of ordinary Portland cement clinker, gypsum, and auxiliary agents is 10 to 210 mg / kg, and the total amount of ordinary Portland cement clinker, gypsum, auxiliary agents, and limestone
• the content of limestone in the mass is 3-10% by mass
• the lattice volume of C 4 AF is greater than 0.4290 nm 3
• the Blaine specific surface area is 2800-3500 cm 2 /g.
• a cement composition is usually obtained by firing prepared raw materials in a rotary kiln, adding gypsum and limestone to the obtained clinker, and pulverizing it in a finishing mill until it reaches the desired Blaine specific surface area.
• pulverizing cement by a finishing mill it is common practice to add a dispersant such as diethylene glycol to the material to be pulverized to prevent a decrease in pulverization efficiency caused by aggregation of particles.
• Control of strength development which is a major physical property of ordinary Portland cement, is generally carried out by adjusting raw material blending and cement fineness (Blaine specific surface area).
• the Blaine specific surface area of the cement composition is adjusted in the pulverization process by the finishing mill, and is a factor controlling the strength level at each material age, so it is regarded as a quality control item.
• Blaine's specific surface area increases the initial strength of mortar and concrete in particular, but reduces the fluidity during kneading of the cement paste, reducing work efficiency. If the amount of chemical admixture is increased to maintain fluidity, the cost will increase, and if the amount of water is increased, drying shrinkage of the cured product will increase, promoting cracking of the cured product and impairing durability.
• the Blaine specific surface area of the cement composition is adjusted in the pulverization process by the finishing mill, and reducing the Blaine specific surface area leads to power reduction during the operation of the finishing mill.
• control of strength development can be carried out by adjusting the ratio of limestone in the raw material, in addition to adjusting Blaine's specific surface area.
• the ratio of limestone in the raw material in addition to adjusting Blaine's specific surface area.
• the amount of alite in the cement mineral is increased, and particularly the strength development at the initial stage of hydration is increased.
• the amount of limestone in the clinker raw material is relatively increased, and the amount of alite in the cement mineral generated can be increased to increase the strength.
• the amount of fuel required for firing increases.
• An increase in the raw material unit consumption of limestone and an increase in the amount of coal used as the main fuel also contribute to an increase in carbon dioxide emissions.
• the cement composition of the present invention keeps the Blaine specific surface area of the cement composition low, suppresses the amount of limestone in the clinker raw material, increases strength, and has excellent fluidity.
• Alkanolamine which is an auxiliary agent contained in the cement composition of the present invention, dissolves the ferrite phase among the four main cement minerals of alite, belite, aluminate, and ferrite, thereby increasing the strength of the cement. can be improved. Specifically, by dissolving the ferrite phase present on the surface of cement particles synthesized from various minerals, the surface area of the cement particles increases, and the cement minerals inside come into contact with water to promote hydration. In addition, iron hydroxide produced by dissolution of ferrite covers the surface of clinker particles and inhibits the diffusion of Ca ions eluted from clinker minerals such as alite, thereby inhibiting hydration. Since it has the effect of dissolving Fe ions of iron, it is considered that it also has the effect of promoting the hydration of alite.
• the cement composition of the present invention will be described in detail below.
• the cement composition of the present invention has a Blaine specific surface area of 2800-3500 cm 2 /g. If the Blaine specific surface area is less than 2800 cm 2 /g, alkanolamine will have a hydration promoting effect, but the mortar strength will be lowered. When the Blaine specific surface area exceeds 3500 cm 2 /g, the fluidity is lowered and the dissolution of C 4 AF by alkanolamine is limited, failing to obtain the effect of increasing strength. From the viewpoint of further increasing strength, the Blaine specific surface area of the cement composition is preferably 3000 to 3400 cm 2 /g, more preferably 3150 to 3350 cm 2 /g. The Blaine specific surface area of the cement composition may be measured according to JIS R 5201:2015 "Methods for Physical Testing of Cement".
• the clinker used in the cement composition of the present invention is a normal Portland cement clinker containing 51 to 62% by mass of C 3 S and 7 to 10% by mass of C 4 AF as calculated by the Borg formula.
• the total amount of C 3 S (3CaO.SiO 2 ) and C 2 S (2CaO.SiO 2 ) in the clinker is constant at approximately 88% by mass, and when C 3 S is 51-62% by mass, C 2
• the S content is 16-27% by mass.
• C 3 A (3CaO.Al 2 O 3 ) and C 4 AF (4CaO.Al 2 O 3 .FeO 3 ) in the clinker was constant at approximately 18.5% by mass, and C 4 AF is 7 to 10% by mass, the content of C 3 A is 8.5 to 12.5% by mass.
• the content of C 3 S in the clinker is preferably 53 to 61% by mass, more preferably 55 to 59% by mass. .
• the alkanolamine dissolves the C 4 AF on the surface of the clinker particles and temporarily promotes the hydration of C 3 S.
• a large amount of iron hydroxide gel generated by the dissolution of Fe ions thickly covers the surface of the clinker particles, thereby delaying hydration.
• the content of C 4 AF in the clinker is preferably 7 to 9% by mass, more preferably 8 to 9% by mass. .
• the lattice volume of C 4 AF is greater than 0.4290 nm 3 .
• the lattice volume of C 4 AF is preferably 0.4295 nm 3 or more, more preferably 0.4300 nm 3 or more.
• the upper limit of the lattice volume of C 4 AF is not particularly limited, it is usually 0.4320 nm 3 or less.
• the lattice volume of C 4 AF can be calculated by WPF (Whole Pattern Fitting) analysis from the lattice constant of C 4 AF measured by Rietveld analysis using powder X-ray diffraction.
• the cement composition of the present invention contains an adjuvant containing alkanolamine, and the alkanolamine content in the total amount of Portland cement clinker, gypsum, and adjuvant is generally 10-210 mg/kg.
• aids is specifically meant grinding aids, alkanolamines also act as strength enhancers.
• Auxiliaries may contain components other than alkanolamine, and examples thereof include aliphatic polyhydric alcohols. If the content of alkanolamine in the cement composition of the present invention is less than 10 mg/kg, the concentration is too low to promote the hydration of alite by dissolving C4AF , resulting in an effect of increasing strength.
• Alkanolamines include monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, methylethanolamine, methylisopropanolamine, Nn-butylethanolamine, N-methyldiethanolamine, and Nn-butyldiethanolamine.
• N-methyldiisopropanolamine, diethanolisopropanolamine, diisopropanolethanolamine, tetrahydroxyethylethylenediamine, N,N,N',N'-tetrakis(2-hydroxypropyl)ethylenediamine, tris(2-hydroxybutyl)amine, etc. can be exemplified. Only one type of alkanolamine may be used, or two or more types may be used.
• the alkanolamine is selected from the group consisting of diethanolisopropanolamine (DEIPA), triisopropanolamine (TIPA), ethanoldiisopropanolamine (EDIPA), N-methyldiethanolamine (MDEA), and Nn-butyldiethanolamine (BDEA).
• DEIPA diethanolisopropanolamine
• TIPA triisopropanolamine
• EDIPA ethanoldiisopropanolamine
• MDEA N-methyldiethanolamine
• BDEA Nn-butyldiethanolamine
• DEIPA diethanol isopropanolamine
• TIPA triisopropanolamine
• MDEA N-methyldiethanolamine
• BDEA Nn-butyldiethanolamine
• DEIPA diethanol isopropanolamine
• TIPA triisopropanolamine
• MDEA N-methyldiethanolamine
• BDEA Nn-butyldiethanolamine
• DEIPA diethanol iso
• the coagent preferably contains an aliphatic polyhydric alcohol.
• the aliphatic polyhydric alcohol preferably has 3 to 20 carbon atoms, more preferably 3 to 10 carbon atoms.
• the aliphatic polyhydric alcohol preferably has 2 to 8 hydroxyl groups, more preferably 2 to 4 hydroxyl groups.
• the aliphatic polyhydric alcohol preferably has a molecular weight of 70-420, more preferably 70-210.
• aliphatic polyhydric alcohols include glycols such as ethylene glycol, diethylene glycol and polyethylene glycol; glycerin and the like. Only one type of aliphatic polyhydric alcohol may be used, or two or more types may be used.
• the aliphatic polyhydric alcohol is preferably at least one selected from the group consisting of glycerin and diethylene glycol, and more preferably contains diethylene glycol.
• the content of the auxiliary agent in the total amount of ordinary portland cement clinker, gypsum and auxiliary agent is preferably 80-350 mg/kg.
• total auxiliary agent means "the content of auxiliary agent in the total amount of ordinary Portland cement clinker, gypsum, and auxiliary agent".
• the air entrainment of the kneaded product is suppressed, the strength is prevented from decreasing, and the fluidity of the powder does not increase more than necessary, so it is difficult to slip during transportation on a belt conveyor, and it is easy to convey uphill. , it is possible to efficiently transport the cement composition by suppressing it from slipping down due to its own weight.
• the total amount of auxiliary agents is more preferably 100 to 350 mg/kg, even more preferably 150 to 300 mg/kg, from the viewpoint of further improving crushability and jetting properties.
• the cement composition of the present invention contains limestone.
• Limestone has a content of 3 to 10% by mass in the total amount of ordinary Portland cement clinker, gypsum, auxiliary agent and limestone.
• limestone content means "the content of limestone in the total amount of ordinary Portland cement clinker, gypsum, auxiliary agent and limestone”. If the limestone content is less than 3% by mass, the effect of increasing strength cannot be obtained.
• ettringite which is formed during initial hydration, undergoes a reaction that converts it to monosulfate as the hydration of cement proceeds. Contributes to strength enhancement.
• the limestone content is preferably 3 to 9% by mass, more preferably 4 to 8% by mass, from the viewpoint of further increasing strength.
• the cement composition of the present invention contains gypsum.
• the content of gypsum in the total amount of ordinary Portland cement clinker, gypsum and alkanolamine is preferably 0.7 to 2.8% by mass in terms of SO 3 .
• gypsum content means "the content of gypsum in the total amount of ordinary Portland cement clinker, gypsum and alkanolamine”.
• the gypsum content is more preferably 0.8 to 2.5% by mass, more preferably 0.9 to 2.0% by mass in terms of SO 3 .
• the gypsum content can be measured according to JIS R 5202:2010 "Method for chemical analysis of Portland cement".
• the ratio of the mass of gypsum in terms of SO 3 in the cement composition can be obtained from the amount of gypsum compounded and the ratio of SO 3 contained in the gypsum.
• any of anhydrous gypsum, hemihydrate gypsum, and dihydrate gypsum can be used.
• fly ash to the cement composition of the present invention, fly ash, blast-furnace slag, silica fume, or the like can be further added for adjusting fluidity, hydration rate, strength development, and the like.
• C 3 S calculated by the Borg formula is 51 to 62% by mass
• C 4 AF is 7 to 10% by mass
• the lattice volume of C 4 AF is 0.4290 nm 3 more than ordinary Portland cement clinker, gypsum, limestone, and an adjuvant containing alkanolamine
• the amount of alkanolamine to be blended is the same as the content of alkanolamine in the cement composition of the present invention, and the preferred range is also the same.
• the amount of limestone to be blended is synonymous with the limestone content described above, and the preferred range is also the same.
• auxiliary agents gypsum and limestone
• gypsum and limestone may be added to clinker and mixed, then an auxiliary agent may be added and mixed, or an auxiliary agent may be added to clinker and then gypsum and limestone may be added.
• the means for mixing each component in the method for producing the cement composition of the present invention is not particularly limited. Examples include mixers, ball mills, roche mills, and air blending silos.
• the mixing time can be set within a range in which it is determined that sufficient mixing is performed in the normal production of cement compositions.
• pulverization is preferably carried out so that the Blaine specific surface area of the cement composition is 2800 to 3500 cm 2 /g.
• blast furnace slag, siliceous admixture and fly ash are further added.
• blast furnace slag and siliceous admixture specified in JIS R 5210:2009 "Portland cement” can be used.
• fly ash in addition to fly ash type I and fly ash type II defined in JIS R 5210:2009 "Portland cement", fly ash type III and fly ash type IV can also be used.
• HM hydraulic modulus
• SM silicic acid modulus
• IM iron modulus.
• C 3 S (4.07 ⁇ CaO) ⁇ (7.60 ⁇ SiO 2 ) ⁇ (6.72 ⁇ Al 2 O 3 ) ⁇ (1.43 ⁇ Fe 2 O 3 )
• C 2 S (2.87 x SiO 2 ) - (0.754 x
• C3A (2.65 x Al2O3 ) - ( 1.69 x Fe2O3 )
• C4AF 3.04 x Fe2O3
• the "C 4 AF lattice volume" in Table 1 was calculated by the WPF analysis method from the lattice constant of C 4 AF measured using the Rietveld analysis method using powder X-ray diffraction. (Measurement condition) ⁇ Powder X-ray diffractometer: X7Pert PRO manufactured by PANalytical ⁇ Rietveld analysis software: High Score Plus manufactured by PANalytical ⁇ X-ray tube: Cu (tube voltage: 45 kV, tube current: 40 mA) ⁇ Slit: divergence slit-variable (irradiation width-12mm, Antiscatter slit-2°) ⁇ Measuring range: 10 to 70° (step width: 0.0167°) ⁇ Scanning speed: 0.1013°/s
• alkanolamine DEIPA diethanol isopropanolamine [manufactured by Tokyo Chemical Industry Co., Ltd.]
• TIPA triisopropanolamine [manufactured by Tokyo Chemical Industry Co., Ltd.]
• EDIPA ethanol diisopropanolamine [manufactured by Sigma-Aldrich Japan LLC]
• MDEA N-methyldiethanolamine [manufactured by Tokyo Chemical Industry Co., Ltd.]
• BDEA Nn-butyldiethanolamine [manufactured by Tokyo Chemical Industry Co., Ltd.]
• Aliphatic polyhydric alcohol DEG diethylene glycol [manufactured by Kanto Kagaku Co., Ltd.]
• Example 1 Add 2.7% by mass of gypsum hemihydrate ( 1.5% by mass in terms of gypsum hemihydrate SO3) and 4.5% by mass of limestone to 92.8% by mass of clinker type A clinker (*) , Mixed with a mixer. Then, as shown in Table 2, diethanol isopropanolamine (DEIPA) and diethylene glycol (DEG) were added as auxiliaries to 10 mg/kg and 190 mg/kg, respectively, based on the total amount of clinker, gypsum, and auxiliaries. kg.
• DEIPA diethanol isopropanolamine
• DEG diethylene glycol
• Example 1 the cement composition of Example 1 was obtained by mixing and pulverizing with a ball mill so that the Blaine specific surface area value was in the range of 3200 ⁇ 50 cm 2 /g.
• the total amount of clinker and auxiliary agent is 92.8% by mass.
• the amount of clinker can be said to be 92.8% by mass.
• the amount of gypsum compounded is the SO3 equivalent amount of gypsum hemihydrate/( total amount of clinker + auxiliary agent + gypsum hemihydrate) in both Examples and Comparative Examples. Gypsum hemihydrate was blended so as to be 1.5%.
• Examples 2 to 19, 23 to 26, Comparative Examples 1 to 4, 7 to 12 As clinker, the types of clinker shown in Tables 2 and 3 are used, limestone is blended in the amount shown in Tables 2 and 3, and the type and amount of auxiliary agent [alkanol An amine and, if necessary, an aliphatic polyhydric alcohol (DEG)] were blended and mixed and pulverized in a ball mill so that the Blaine specific surface area value was within the range of ⁇ 50 cm 2 /g shown in Tables 2 and 3. obtained a cement composition in the same manner as in Example 1. In Comparative Examples 1 and 2, alkanolamine was not blended. In addition, in Comparative Example 2 and the like where the numerical value in the "DEG" column is 0, diethylene glycol was not blended.
• auxiliary agent alkanol An amine and, if necessary, an aliphatic polyhydric alcohol (DEG)
• Example 20 To 94.1% by mass of clinker type A clinker, 2.7% by mass of gypsum hemihydrate ( 1.5% by mass in terms of gypsum hemihydrate SO3) and 3.2% by mass of limestone are added and mixed in a mixer. did. Then, as shown in Table 3, diethanol isopropanolamine (DEIPA) and diethylene glycol (DEG) were added as auxiliaries to 50 mg/kg and 150 mg/kg, respectively, based on the total amount of clinker, gypsum, and auxiliaries. kg. Then, the cement composition of Example 20 was obtained by mixing and pulverizing with a ball mill so that the Blaine specific surface area value was in the range of 3200 ⁇ 50 cm 2 /g.
• DEIPA diethanol isopropanolamine
• DEG diethylene glycol
• Example 21 To 90.9% by mass of clinker type A clinker, 2.6% by mass of gypsum hemihydrate ( 1.5% by mass in terms of gypsum hemihydrate SO3) and 6.5% by mass of limestone are added and mixed in a mixer. did. Then, as shown in Table 3, diethanol isopropanolamine (DEIPA) and diethylene glycol (DEG) were added as auxiliaries to 50 mg/kg and 150 mg/kg, respectively, based on the total amount of clinker, gypsum, and auxiliaries. kg. Then, the cement composition of Example 21 was obtained by mixing and pulverizing with a ball mill so that the Blaine specific surface area value was in the range of 3200 ⁇ 50 cm 2 /g.
• DEIPA diethanol isopropanolamine
• DEG diethylene glycol
• Example 22 To 88.0% by mass of clinker type A clinker, 2.5% by mass of gypsum hemihydrate ( 1.5% by mass in terms of gypsum hemihydrate SO3) and 9.5% by mass of limestone are added and mixed in a mixer. did. Then, as shown in Table 3, diethanol isopropanolamine (DEIPA) and diethylene glycol (DEG) were added as auxiliaries to 50 mg/kg and 150 mg/kg, respectively, based on the total amount of clinker, gypsum, and auxiliaries. kg. Then, the cement composition of Example 22 was obtained by mixing and pulverizing with a ball mill so that the Blaine specific surface area value was in the range of 3200 ⁇ 50 cm 2 /g.
• DEIPA diethanol isopropanolamine
• DEG diethylene glycol
• Jetability Using a powder tester (TP-X) manufactured by Hosokawa Micron Corporation, the repose angle, collapse angle, and degree of dispersion of the cement compositions of Examples and Comparative Examples were measured, and applied to the jettability index table of the same device. Then, the jettability index was obtained. The smaller the jettability index, the more excellent the cement composition is in jettability. Preferably the index is less than 75. The results are shown in the "jetting index" column of Tables 2 and 3.
• Mortar Strength The strength of the mortars obtained using the cements of Examples and Comparative Examples was evaluated according to JIS R 5201 "Physical Testing Methods for Cement". The higher the number, the higher the strength of the mortar obtained using the cement composition, and the acceptable range is above 60 N/mm 2 . The results are shown in the "mortar strength" column of Tables 2 and 3.
• Fluidity The fluidity of the mortar obtained from the cement composition was evaluated according to JIS R 5201 "Physical Testing Methods for Cement". Specifically, 1.0% of a high-performance water reducing agent [manufactured by Kao Corporation, trade name "Mighty 150"] is added to the cement compositions of Examples and Comparative Examples, and mortar is prepared. For the mortar prepared and obtained, the flow value was measured at the time when the spreading of the mortar stopped after pulling out the cone without performing 15 falling motions. The higher the flow value, the better the fluidity of the mortar obtained from the cement composition. The tolerance is greater than 160mm. The results are shown in the "0 stroke flow" column of Tables 2 and 3.

Landscapes

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

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=78466266

Family Applications (1)

Country Status (6)

Families Citing this family (1)

Citations (5)

Family Cites Families (6)

• 2021
  • 2021-03-26 JP JP2021053980A patent/JP6966012B1/ja active Active
• 2022
  • 2022-01-24 WO PCT/JP2022/002355 patent/WO2022201818A1/ja active Application Filing
  • 2022-01-24 NZ NZ797549A patent/NZ797549A/en unknown
  • 2022-01-24 CN CN202280006344.6A patent/CN116249680B/zh active Active
  • 2022-01-24 KR KR1020237004567A patent/KR102593416B1/ko active IP Right Grant
  • 2022-01-24 AU AU2022246322A patent/AU2022246322B2/en active Active

Patent Citations (5)

Also Published As

Similar Documents

Legal Events