Method for improving quality of fly ash concrete blending material

A technology for fly ash and admixtures, applied in sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problem of not improving the quality and product grade of fly ash, not mentioning the water demand ratio, burning Loss of volume and other problems, to achieve the effect of improving the use value, good economic benefits, and improving performance

Inactive Publication Date: 2009-01-14
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore above-mentioned method all can not directly improve the quality and the product grade of the fly ash as the concrete admixture
For example, in the above-mentioned technol

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] The original fly ash has the main performance indicators shown in Table 1.

[0012] The original state fly ash main performance index in the embodiment 1 of table 1

[0013] level

wait

Fineness (0.045mm square hole sieve) (%)

73

Water demand ratio (%)

135

Loss on ignition (%)

7

Moisture content (%)

0.8

[0014] sulphur trioxide(%)

2.5

28-day compressive strength ratio (%)

58

[0015] By weight percentage, 64.5% of the above-mentioned extra-grade fly ash is mixed with 20% blast furnace water quenching slag and 15% magnetite quartzite iron ore tailings and 0.5% melamine formaldehyde resin sodium sulfonate to 0.045mm square The remaining 6% of the hole sieve is used to obtain the improved fly ash concrete admixture, and its main performance indicators are shown in Table 2.

[0016] Main indicators of the improved fly ash concrete admixture in Table 2 Example 1

[...

Embodiment 2

[0022] The original fly ash has the main performance indicators shown in Table 4.

[0023] Main performance index of original state fly ash in table 4 embodiment 2

[0024] level

[0025] By weight percentage, 50.4% of the above-mentioned extra-grade fly ash is mixed with 30% blast furnace water quenching slag and 19% magnetite quartzite iron ore tailings and 0.6% melamine formaldehyde resin sodium sulfonate to 0.045mm square If the remaining 11% is sieved by the hole sieve, the improved fly ash concrete admixture is obtained, and its main performance indicators are shown in Table 5.

[0026] Main indicators of the improved fly ash concrete admixture in Table 5 Example 2

[0027] level

[0028] Table 6 shows the performance comparison results of the concrete prepared with the improved fly ash and original fly ash in the above-mentioned Example 2 and the reference concrete without fly ash.

[0029] Table 6 uses the improved fly ash in embodiment 2 and the ...

Embodiment 3

[0033] The original fly ash has the main performance indicators shown in Table 7.

[0034] Main performance index of original state fly ash in table 7 embodiment 3

[0035] level

wait

Fineness (0.045mm square hole sieve) (%)

53

Water demand ratio (%)

125

Loss on ignition (%)

5

Moisture content (%)

0.8

sulphur trioxide(%)

2.8

28-day compressive strength ratio (%)

55

[0036] 84.6% of the above-mentioned extra-grade fly ash is mixed with the tailings of 10% blast furnace water-quenched slag and 5% quartzite and 0.4% melamine formaldehyde resin sodium sulfonate to 0.045mm square hole sieve by weight percentage. %, the improved fly ash concrete admixture is obtained, and its main performance indicators are shown in Table 8.

[0037] Main indicators of the improved fly ash concrete admixture in Table 8 Example 3

[0038] level

Class I

Fineness (0.045mm square hol...

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Abstract

The invention provides a method for improving the quality of a fly ash concrete admixture. 50 to 97 percent of undisturbed fly ash, 1 to 30 percent of blast furnace slag, 1 to 30 percent of tailings of magnet quartzite type iron ore or quartzite tailings or marble tailings or granite tailings or stone powder scrapped during stone processing, 0.1 to 1 percent of melamine formaldehyde resin sodium sulfonate, in weight percentage, are mixed and ground together until the triage of a 0.045mm square-mesh sieve is less than or equal to 12 percent. The off-standard fly ash and III-grade fly ash with a gross amount over 80 percent can be improved into the I-grade fly ash or II-grade fly ash according to the method, the utilization value of inferior fly ash can be raised substantially, and the method has advantages of good economic benefit, enlarging the amount of admixture, saving cement and improving the performance of concrete.

Description

technical field [0001] The invention belongs to the field of building materials and environmental protection engineering and technology, in particular to a method for improving the quality of fly ash concrete admixture. Background technique [0002] In 2007, the total amount of thermal power generation in my country was 2.698 billion kwh, and the discharge of fly ash was 307 million tons, of which about 20% of the fly ash could reach the grade I and II powder used in concrete admixtures stipulated in GB1596-91. The standard of coal ash, the rest of the fly ash is difficult to be used as a concrete admixture and be used in large quantities, resulting in a large amount of fly ash dumped and disposed of, polluting the environment. On the other hand, with the rapid rise of energy prices, the price of cement has also been rising, which has led to a rapid rise in the price of slag superfine powder and Class I fly ash that can be used as high-grade concrete admixtures. Whether it i...

Claims

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Application Information

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IPC IPC(8): C04B18/08C04B18/14C04B18/12
CPCC04B40/0039Y02W30/91C04B18/08C04B18/12C04B18/141C04B20/0076C04B24/223C04B28/02C04B14/02
Inventor 倪文张玉燕刘凤梅谭园园
Owner UNIV OF SCI & TECH BEIJING
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