Kaolin gangue composite powder and application of same in premixed concrete

A technology of kaolin tailings and ready-mixed concrete, which is applied in kaolin tailings composite powder and ready-mixed concrete. In the field of kaolin tailings composite powder, it can solve the problems of no value-added tax preferential policies, lack of fly ash resources, Problems such as high transportation costs, achieving significant economic and social benefits, low manufacturing costs, and reasonable component ratios

Inactive Publication Date: 2012-08-01
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the production cost of the enterprise is restricted by the transportation radius. If the power plant is located within the transportation radius of 100 kilometers, it is the most cost-effective to use its fly ash; but if it exceeds 200 kilometers, the transportation cost is high, and the production will lose money
[0004] At present, no matter whether it is the production and sales of fly ash or the use of fly ash as raw materials to produce other building materials, there is no relevant VAT preferential policy; in areas lacking thermal power plants, fly ash resources are also scarce

Method used

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  • Kaolin gangue composite powder and application of same in premixed concrete
  • Kaolin gangue composite powder and application of same in premixed concrete
  • Kaolin gangue composite powder and application of same in premixed concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Kaolin tailings from a certain place in China are used as the main raw material, and the chemical composition is as follows by weight percentage:

[0028] Element

SiO 2

Al 2 o 3

Fe 2 o 3

CaO

MgO

K 2 O+Na 2 o

other

content

83.34

10.05

0.35

0.15

0.08

2.23

3.80

[0029] Weigh the mixture according to the following mass percentages:

[0030] (1) Kaolin tailings (moisture content <1%) 91%

[0031] (2) quicklime 7.0% (according to CaO content)

[0032] (3) Natural anhydrite 1.25%

[0033] (4) Sodium hydroxide 0.75%

[0034] Grind the mixture with a common ball mill to obtain kaolin tailings composite powder, with a fineness of 400 mesh, a sieve balance of 13.6 wt %, and a specific surface area of ​​550 m 2 / kg, moisture content <1%.

[0035] The obtained kaolin tailings composite powder is added to the ready-mixed concrete by 2.4% of the concrete mass; the compone...

Embodiment 2

[0046] The kaolin tailings composite powder obtained in embodiment 1 is added in the ready-mixed concrete by 4.38% of concrete quality; The component of described concrete is by weight percentage:

[0047]

[0048]

[0049] Table 3 shows the construction and mechanical performance results of the kaolin tailings composite powder prepared in this example added to the ready-mixed concrete and the ready-mixed concrete prepared by using fly ash as an admixture in the prior art.

[0050] table 3

[0051]

[0052] It can be seen from the results in Table 3 that after the kaolin tailings composite powder prepared in the example is added to the ready-mixed concrete, the overall mechanical properties of the concrete tend to be enhanced. From the point of view of this index, it can completely replace Class F Class II fly ash to prepare concrete, and its use can also improve the water retention and cohesion of the concrete mixture.

Embodiment 3

[0054] The kaolin tailings composite powder obtained in embodiment 1 is added in the ready-mixed concrete by 2.55% of concrete quality; The component of described concrete is by weight percentage:

[0055]

[0056]Table 4 shows the construction and mechanical performance results of the kaolin tailings composite powder prepared in this example added to the ready-mixed concrete and the ready-mixed concrete prepared by using fly ash as an admixture in the prior art.

[0057] Table 4

[0058]

[0059] It can be seen from the results in Table 4 that after the kaolin tailings composite powder prepared in the example is added to the ready-mixed concrete, the overall mechanical properties of the concrete tend to be enhanced. From the point of view of this index, it can completely replace Class F Class II fly ash to prepare concrete, and its use can also improve the water retention and cohesion of the concrete mixture.

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Abstract

The invention provides kaolin gangue composite powder and the application of the same in premixed concrete. A powder body comprises the following components: kaolin gangue, calcium oxide, dried gypsum and at least one of sodium silicate or sodium hydroxide. The powder body is formed by mechanically and finely grinding the raw materials according to certain mass ratio. Application of the powder in the premixed concrete is that kaolin gangue composite powder occupying 2.4% to 4.5% of concrete in mass is added into the concrete. The powder body can completely replace coal ash to prepare common concrete for construction, and the mixture has better water-retaining performance and sticky polymerization performance and cannot affect mechanical performance and durability of the concrete. The powder is reasonable in component proportion and capable of replacing F-class coal ash, and preparation of the powder can meet requirements for concrete strength, peaceability and durability. The powder is suitable for concrete preparation in projects such as hydroelectric dams, roads, port docks and public / civil buildings, resolves the problem of unbalanced supply and demand in coal ash areas, is low in preparation cost and environment-friendly and has remarkable economical and social benefits.

Description

technical field [0001] The invention discloses a kaolin tailings composite powder and its application in ready-mixed concrete, and mainly relates to a kaolin tailings composite powder that can replace fly ash as a cement or concrete admixture, belonging to mineral resources processing and Field of application technology. Background technique [0002] Fly ash is a fine ash-like residue discharged from the boiler flue gas after coal powder is burned. It is an artificial pozzolanic substance and one of the "three wastes" in industry. At present, it is mainly used in the preparation of concrete, which has the functions of improving concrete strength, drying shrinkage, saving cement, and reducing costs. In foreign countries, the fly ash with CaO content exceeding 10% is called Class C ash, and the fly ash with less than 10% is called Class F ash. Class C ash itself has certain hydraulicity and can be used as cement admixture. Class F ash is often used as a concrete admixture, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/12C04B28/04
CPCY02W30/91
Inventor 杨华明邓元臣胡佩伟庄启斌李晓鸣朱永杰傅梁杰唐爱东
Owner CENT SOUTH UNIV
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