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Method for making high performance cement mixed material from flyash

A fly ash, high performance technology used in masonry mortars. , In the field of high-performance concrete, it can solve the problems of high cost, low activity and complex process.

Inactive Publication Date: 2005-02-23
李国栋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, a lot of compound excitation is used, that is, dry grinding of lime, gypsum, sodium sulfate and fly ash mixed. Although the early strength has been improved, the activity is not high, and the dosage is low, not higher than 30%, and the effect is not ideal. Poor stability, often mixed with slag, zeolite
Lime alkali high-temperature excitation and steam curing excitation have not been widely used due to high cost, large investment, and complicated process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Formula by weight percentage: 15% quicklime; 3% quick gypsum; 76% wet discharge fly ash (calculated as solid); 1.0% sodium sulfate; 1.7% calcium carbonate; 0.05% triethanolamine; 1% calcium chloride; lignin Calcium sulfonate 0.45%; Sodium nitrite 1.0%; Ferrous sulfate 0.8%. Add water and grind in a ball mill until the sieve of 45 μm is 15%, release the slurry, and spray dry to a moisture content of less than 1%, which is a high-performance multifunctional cement mixture with early strength, high strength, frost resistance, and impermeability. Replace 52.5R Portland cement with 40% and 50% high-performance fly ash equivalent, according to GB / T1767T1-1999 "Cement Mortar Strength Test Method Test", its strength indicators reach 42.5, 32.5 grades, and other indicators Both meet the national standard GB12958-1999 "Composite Portland Cement". It has early strength, frost resistance, impermeability, low heat of hydration, and good workability. Used in concrete admixtures, th...

Embodiment 2

[0019] Same as Example 1, except that acetylene gas slag or milk of lime is used to replace quicklime on a dry basis; phosphogypsum is used to replace quicklime on a dry basis, and third-grade fly ash with a carbon content of 12% is used. The result is the same.

Embodiment 3

[0021] Same as Example 1, the difference is that the fineness of the slurry is 45 μm and the sieve residue is 9%, and 525R Portland cement is replaced with 55%, 70% equivalent, according to GB / T1767T1-1999 "Cement Mortar Strength Test Method" Test", its strength indicators reach 42.5 and 32.5 respectively, and other indicators reach the national standard GB12958-1999 "Composite Portland Cement". Good workability and high water reducing rate.

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Abstract

A flyash mixture used for preparing high-performance cement is prepared from 11 raw materials including alkaline lime material, gypsum, flyash, sodium sulfate, calcium carbonate, etc through mixing them with water, grinding, sieving, and spray drying or baking. Its advantages are high activity, multiple functions, low cost and high performance.

Description

technical field [0001] The present invention relates to a method for producing high-performance cement admixture with fly ash. The cement admixture produced by this method has characteristics such as high activity, containing a large amount of ultrafine powder, and multi-function, and can be used for fly ash Portland cement, Composite Portland cement, ordinary Portland cement, and high-performance Portland cement are mixed materials and ground for the preparation of concrete, high-performance concrete, and masonry mortar. It belongs to the technical field of building materials and the technical field of environmental protection. Background technique [0002] Fly ash is a large amount of industrial waste, and its treatment and comprehensive utilization have attracted much attention from all over the world. The commonly used method in our country is to use undisturbed fly ash or finely ground fly ash as cement admixture and concrete admixture, brick and block. The use of fly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/24C04B28/02
CPCC04B28/02C04B7/243Y02P40/10Y02W30/91C04B12/04C04B18/08C04B22/064C04B22/085C04B22/10C04B22/124C04B22/143C04B22/147C04B22/149C04B24/122C04B24/18
Inventor 李国栋
Owner 李国栋
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