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Road surface based material by sintering red mud and construction method thereof

A pavement base material and construction method technology, applied in the field of sintered red mud pavement base material and its construction, can solve the problems of poor water scour resistance, poor durability, poor frost resistance and the like, and achieve strong water scour resistance, Poor durability, reducing the effect of red mud stacking

Active Publication Date: 2006-06-28
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bayer red mud has poor activity. Although it has been stored for a long time, it is still a loose fine-grained soil material. It needs an external curing agent to form a stable strength. This curing material has poor frost resistance and poor water erosion resistance. , Poor durability, and fine-grained materials are uniformly mixed. Generally, concentrated mixing and airport mixing are used for construction.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The sintering method red mud pavement base material of the present invention, its batching weight percentage distribution ratio is:

[0029] Sintered Red Mud 75%

[0030] Fly Ash 15%

[0031] Lime 10%

[0032] 2% external additive for papermaking black liquor.

[0033] The road construction method is as follows:

[0034] (1) Prepare red mud, fly ash, gypsum powder and external additive raw materials according to the proportion of ingredients, determine the loose laying density of various raw materials, and calculate the loose laying thickness of various materials;

[0035] (2) Spread the red mud evenly on the soil subgrade treated by rolling according to the calculated loose paving thickness, and pre-mix it twice with a stabilized soil mixer to pre-break the large red mud; roll it with a road roller for 1 to 2 Then use a grader to make 2% of the road arch, and sprinkle water during the mixing and rolling process to form a red mud layer;

[0036] (3) Spread fly ash,...

Embodiment 2

[0042] The sintering method red mud pavement base material of the present invention, its batching weight percentage distribution ratio is:

[0043] Sintered Red Mud 85%

[0044] Fly Ash 10%

[0045] Lime 5%

[0046] Gypsum powder external additive 3%.

[0047] Road construction method After mixing, the content of red mud particles with a particle size > 20mm is controlled to 9%; after rolling, water is sprinkled to maintain the moisture content of the mixture at 45%, and the others are the same as in Example 1.

[0048] According to the above construction method, the maximum dry density is 1.20g / cm 3. The degree of compaction is detected by the ring knife method: the base layer is 97.5%, and the subbase layer is 95.2%. The 7d water immersion compressive strength of the compressive test piece is 0.9MPa, reaching the first-class expressway strength standard.

Embodiment 3

[0050] The sintering method red mud pavement base material of the present invention, its batching weight percentage distribution ratio is:

[0051] Sintered Red Mud 75%

[0052] Fly Ash 15%

[0053] Lime 10%

[0054] Gypsum powder external additive 1%.

[0055] Road construction method After mixing, the content of red mud particles with a particle size > 20mm is controlled to 8%; watering is carried out to maintain the moisture content of the mixture at 48%, and the others are the same as in Example 1.

[0056] According to the above construction method, the maximum dry density is 1.25g / cm 3 . The degree of compaction is detected by the ring knife method: the base layer is 98.5%, and the subbase layer is 95.1%. The 7d water immersion compressive strength of the compressive test piece is 1.63MPa, reaching the first-class expressway strength standard.

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Abstract

A material for the bed of pavement is prepared from the red earth generated by sinter method (75-85 Wt%), powdered coal ash (10-17), lime (5-15), and additive (1-3). Its advantages are high quality of road bed, high construction speed, and low cost.

Description

technical field [0001] The invention relates to a sintering red mud pavement base material and a construction method thereof, belonging to red mud recycling technology. Background technique [0002] After the bauxite is processed by alkali dissolution, the remaining reddish pink muddy strong alkaline solid waste with high water content after producing alumina is called red mud. Its composition and output vary depending on ore grade, production method and technology. varies by level. Every 1t of Al produced 2 o 3 Discharge about 1-1.5t of red mud. Most foreign aluminum plants discharge red mud into the ocean for disposal. Domestic aluminum plants are generally located in inland provinces, and stockyards are usually built for storage. Because a large amount of red mud has not been fully utilized and treated, it occupies a large amount of land for a long time, consumes a lot of storage yard construction and maintenance management costs, and the alkali-containing waste liqu...

Claims

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Application Information

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IPC IPC(8): C04B18/04C04B18/30C04B18/08C04B22/10E01C3/04
CPCY02W30/91
Inventor 侯健杨家宽姚昌仁齐波刘辉邢国郭怀胜于华东刘伟赵文海
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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