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

A pavement base material and construction method technology, which is applied in the field of sintered red mud pavement base material and its construction, can solve the problems of poor frost resistance, poor water erosion resistance, and poor durability, and achieve poor durability and water erosion resistance. Strong ability, reduce the effect of red mud accumulation

Active Publication Date: 2007-09-26
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 sintered red mud pavement base material of the present invention has the following ingredient weight percentage:

[0029] Sintering method red mud 75%

[0030] Fly ash 15%

[0031] Lime 10%

[0032] The external additive of papermaking black liquor is 2%.

[0033] The road construction method is as follows:

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

[0035] (2) Spread the red mud evenly according to the calculated loose paving thickness on the soil roadbed that has been compacted, and use a stabilized soil mixer to pre-mix 2 times to pre-crush the large pieces of red mud; use a road roller to compact 1~2 Then use a grader to form a 2% road arch, and sprinkle water during the mixing and rolling process to form a red mud layer;

[0036] (3) Spread fly ash, lime and external additives i...

Embodiment 2

[0042] The sintered red mud pavement base material of the present invention has the following ingredient weight percentage:

[0043] Sintering red mud 85%

[0044] Fly ash 10%

[0045] Lime 5%

[0046] The external additive of gypsum powder is 3%.

[0047] Road construction method The content of red mud particles with a particle size> 20mm after mixing is controlled to 9%; after rolling, the water content of the mixture is maintained at 45% by spraying water. 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 was measured by the ring knife method: the base layer was 97.5%, and the bottom base layer was 95.2%. The 7d immersion compressive strength of the compressive test piece was 0.9MPa, which reached the first-class expressway strength standard.

Embodiment 3

[0050] The sintered red mud pavement base material of the present invention has the following ingredient weight percentage:

[0051] Sintering method red mud 75%

[0052] Fly ash 15%

[0053] Lime 10%

[0054] The external additive of gypsum powder is 1%.

[0055] After the road construction method is mixed, the content of red mud particles with a particle size of> 20mm is controlled to 8%; the water content of the mixture is maintained at 48% by sprinkling, 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 was measured by the ring knife method: the base layer was 98.5%, and the bottom base layer was 95.1%. The 7d immersion compressive strength of the compressive test piece is 1.63MPa, which reaches 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 sintered red mud pavement base material and a construction method thereof, and belongs to a red mud reuse technology. Background technique [0002] The bauxite ore undergoes alkali leaching treatment, and the red-red silt-like strong alkaline solid waste with high water content remaining after the production of alumina is called red mud. Its composition and output vary depending on the grade of the ore, production methods, and technology. Varies by level. Every 1t of Al produced 2 O 3 Approximately 1 to 1.5t of red mud will be discharged. Most of the foreign aluminum factories discharge the red mud into the ocean for disposal. Domestic aluminum factories are generally located in inland provinces, and storage yards are usually built for storage. A large amount of red mud has not been fully utilized and treated, occupying a large amount of land for a long time, consuming more yard construction and maintenance management costs, and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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