Modified coal ash used in cement and concrete and preparation method of modified coal ash

A technology for fly ash and concrete, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve unseen problems, reduce grinding energy consumption, reduce fineness requirements, and improve activity index Effect

Inactive Publication Date: 2013-03-06
SHANGHAI BAOTIAN NOVEL BUILDING MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After searching, there is no technical literature on the use of sintered desulfurization ash as a fly ash admixture and related patents on the design and preparation technology of sintered desulfurization ash modified fly ash mineral admixture

Method used

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  • Modified coal ash used in cement and concrete and preparation method of modified coal ash
  • Modified coal ash used in cement and concrete and preparation method of modified coal ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Class C fly ash 99wt%, 28d activity index 77%;

[0021] Sintering dry desulfurization ash 1wt%.

[0022] The above two materials are mixed uniformly by mechanical stirring to make modified fly ash. Check the activity index with reference to GB / T1596-2005 "Fly Ash Used in Cement and Concrete". The test results are shown in Table 1.

Embodiment 2

[0024] Class C fly ash 97wt%, 28d activity index 77%;

[0025] Sintering dry desulfurization ash 3wt%.

[0026] The above two materials are mixed uniformly by mechanical stirring to make modified fly ash. Check the activity index with reference to GB / T1596-2005 "Fly Ash Used in Cement and Concrete". The test results are shown in Table 1.

Embodiment 3

[0028] Class C fly ash 95wt%, 28d activity index 77%;

[0029] Sintering dry desulfurization ash 5wt%.

[0030] The above two materials are mixed uniformly by mechanical stirring to make modified fly ash. Check the activity index with reference to GB / T1596-2005 "Fly Ash Used in Cement and Concrete". The test results are shown in Table 1.

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Abstract

The invention discloses modified coal ash used in cement and concrete and a preparation method of the modified coal ash. The modified coal ash comprises the following raw materials: 95-99wt% of F-class coal ash or C-class coal ash and 1-5wt% of sintering dry-process desulfurized fly ash. The modified coal ash has the characteristics of fineness being not more than 25.0 percent, water demand ratio being not more than 105 percent, ignition loss being not more than 8.0 percent, water content being not more than 1.0 percent, sulfur trioxide content being not more than 3.0 percent, free calcium oxide content being not more than 4.0 percent, qualified stability and strength activity index being not less than 78 percent. Compared with the common coal ash, the modified coal ash disclosed by the invention has the advantages that the 28-day activity index is greatly increased, the fineness requirement can be properly reduced, and the grinding energy consumption can be effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of new materials, environmental protection and energy saving, and specifically relates to a modified fly ash used in cement and concrete and a preparation method thereof, which is solid waste such as sintering dry desulfurization by-products of iron and steel enterprises-dry desulfurization ash Provides an effective way of resource utilization. Background technique [0002] China's iron and steel industry is the second largest sulfur dioxide emitting industry next to the power industry, and the sulfur dioxide produced in the sintering process accounts for 90% of the total sulfur dioxide emissions of the entire industry. In order to achieve the national "Twelfth Five-Year Plan" energy-saving and emission reduction goals, the iron and steel industry will fully implement sintering flue gas desulfurization at the end of the "Twelfth Five-Year Plan". With the acceleration of sintering flue gas desulfurization, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/08
CPCY02W30/91
Inventor 顾文飞徐兵周维黄晓锋
Owner SHANGHAI BAOTIAN NOVEL BUILDING MATERIALS
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