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Fly ash gelled material and dry-mixed mortar thereof

A cementitious material, fly ash technology, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems that are not conducive to the environment and personal safety, slow release of ammonia gas, application restrictions, etc.

Inactive Publication Date: 2010-08-25
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the cement will slowly release ammonia gas during use, which is not conducive to the environment and personal safety
In order to solve the above problems, U.S. Patent No. 5,645,518 and the patent WO02 / 24598A2 of the World Patent Organization all disclose the use of potassium phosphate and magnesium oxide to prepare cementitious materials, which can convert non-toxic industrial waste (such as low-calcium fly ash) Converted into building materials, it can also solidify poisonous industrial waste, but this kind of cement has potential radioactivity
Therefore, the application of the above two cements is greatly restricted

Method used

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  • Fly ash gelled material and dry-mixed mortar thereof
  • Fly ash gelled material and dry-mixed mortar thereof
  • Fly ash gelled material and dry-mixed mortar thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: The magnesia used is dead-burned magnesia purchased from Shandong Ludong Refractory Co., Ltd., the calcination temperature is 1500°C, the magnesium oxide content is 91%, and the fineness is 45 microns, and the sieve residue is 15 %; Sodium dihydrogen phosphate and disodium hydrogen phosphate were purchased from Wuhan Huachuang Chemical Co., Ltd., both of which contained 98% of effective substances, both in granular form, with a particle size of ≤2.0mm; fly ash was purchased from Shenzhen Mawan The low-calcium fly ash of the power plant belongs to the secondary ash, and the fineness is 12% of the 45 micron square hole sieve; the commercially available chemical reagent borax (sodium tetraborate decahydrate) is used as the retarder.

[0023] Prepare 5Kg of the fly ash cementitious material of the present invention. Take above-mentioned various materials by mass ratio, magnesia 34%, sodium phosphate 26% (wherein sodium dihydrogen phosphate 80%, disodium hydrogen ...

Embodiment 2

[0024] Embodiment 2: Prepare 5Kg of the fly ash cementitious material of the present invention. Take various materials by mass ratio, magnesia 28%, sodium phosphate 22% (wherein sodium dihydrogen phosphate 80%, disodium hydrogen phosphate 20%), fly ash 50%, borax accounts for 20% of total cementitious material 2%; then mix in a mixer for 10 minutes to make the material uniform.

Embodiment 3

[0025] Embodiment 3: Prepare 5Kg of the fly ash cementitious material of the present invention. Take various materials by mass ratio, magnesia 23%, sodium phosphate 17% (wherein sodium dihydrogen phosphate 80%, disodium hydrogen phosphate 20%), fly ash 60%, borax accounts for 20% of total cementitious material 2%; then mix in a mixer for 10 minutes to make the material uniform.

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Abstract

The invention relates to a gelled material prepared by fly ash and dry-mixed mortar thereof. The fly ash gelled material comprises the following components in percentage by weight: 7.5-45 percent of sodic phosphate, 7.5-45 percent of magnesite, 10-85 percent of fly ash, 1.0-9.0 percent of retarding agent. The d dry-mixed mortar of the fly ash gelled material comprises fly ash gelled material and fine aggregate, wherein the mass ratio of the fly ash gelled material to the fine aggregate is 1:0.8-1.5. The fly ash gelled material has high fly ash dosage, increases the activating degree of fly ash, greatly increases the utilization ratio of the fly ash, has wide application of products, can be conveniently and flexibly used, can be used as a rapid repairing material and an emergency repair and rush construction material of engineering, can change a mould as required in order to conveniently produce various constructional materials, such as bearing materials, light-weight high-strength materials, high-temperature heat insulation or sound absorption and sound insulation materials, and the like.

Description

[technical field] [0001] The invention relates to an inorganic cementitious material, in particular to a cementitious material and dry-mixed mortar prepared by using fly ash. [Background technique] [0002] Fly ash is the pulverized ash particles collected by the dust collector after the pulverized coal is burned in the boiler in the coal-fired power plant, and its chemical composition is mainly oxide SiO 2 、Al 2 o 3 and Fe 2 o 3 , the sum of the three generally exceeds 70%. For ordinary low-calcium fly ash (also known as Class F ash), the CaO content does not exceed 10%, generally less than 5%. The mineral composition of fly ash is mainly quartz, mullite, magnetite, hematite, carbon particles and aluminosilicate glass body. Usually fly ash contains a lot of vitreous body, but the content of crystalline substances is sometimes relatively high, and fly ash also contains a small amount of unburned carbon particles. In terms of chemical composition, fly ash is a potentia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/26
CPCC04B28/344C04B40/0608C04B2111/72C04B18/08C04B2103/0006Y02W30/91C04B14/02C04B14/304C04B20/0076C04B22/0013C04B2103/22
Inventor 丁铸邢锋董必钦
Owner SHENZHEN UNIV