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US 2019/0161409 A1Published application
Rapid-hardening admixture and method for producing same
AssigneeMitsubishi Materials Corporation
InventorsKiyoshi KAMITANI, Kenji TOKUNAGA, Hideo TAWARA
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Abstract
The present invention provides a rapid-hardening admixture for accelerating hardening of a cement composition and a method for producing the same. The rapid-hardening admixture includes calcium aluminate, inorganic sulfate, and a setting modifier, in which the calcium aluminate has an average particle diameter in a range of 8 μm to 100 μm, and the setting modifier has an average particle diameter of 5 μm or less.
Claims7
1:
- A rapid-hardening admixture, comprising:
- calcium aluminate;
- inorganic sulfate;
- and
- a setting modifier,
- wherein the calcium aluminate has an average particle diameter in a range of 8 μm to 100 μm, and
- the setting modifier has an average particle diameter of 5 μm or less.
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2:
- The rapid-hardening admixture according to claim 1,
- wherein the calcium aluminate has one or more compositions selected from the group consisting of 12CaO.7Al2O3, 11CaO.7Al2O3.CaF2, and CaO.Al2O3, and
- the calcium aluminate has a vitrification rate of 80% or more.
3:
- The rapid-hardening admixture according to claim 1,
- wherein the inorganic sulfate is anhydrous gypsum having a Blaine specific surface area of 8,000 cm2/g or more.
4:
- The rapid-hardening admixture according to claim 1,
- wherein the setting modifier comprises at least one selected from the group consisting of an inorganic carbonate, oxycarboxylic acid, sodium aluminate, and sodium sulfate.
5:
- The rapid-hardening admixture according to claim 1,
- wherein, with respect to 100 parts by mass of the calcium aluminate, the inorganic sulfate is contained in a range of 50 parts by mass to 200 parts by mass, and
- the setting modifier is contained in a range of 0.1 parts by mass to 10 parts by mass.
6:
- A method for producing a rapid-hardening admixture, the method comprising:
- mixing and crushing a clinker comprising calcium aluminate and a setting modifier to obtain a mixed and crushed product;
- and
- mixing the mixed and crushed product with inorganic sulfate.
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7:
- The method according to claim 6,
- wherein the clinker before the mixing and crushing has an average particle diameter in a range of 1 mm to 30 mm,
- the setting modifier before the mixing and crushing has a particle diameter in a range of 150 μm to 500 μm, and
- the mixing and crushing is carried out until a Blaine specific surface area of the mixed and crushed product falls within a range of 3,000 cm2/g to 5,500 cm2/g.
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