Inorganic mixture prepared by lime dried sludge

A technology of drying sludge and mixed materials, which is applied in roads, roads, buildings, etc., can solve the problem of less application, and achieve the effects of preventing secondary pollution, reducing production costs, good mechanics and durability

Inactive Publication Date: 2013-09-11
北京市政路桥科技发展有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitation of the construction period, cement-stabilized graded gravel should be controlled within 3 hours from the time of mixing to the completion of construction rolling, so its application in Beijing is less

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The composition of the inorganic mixture is (Kg):

[0024] Lime dried sludge 300

[0025] Fine-grained soil 700

[0026] Among them, the effective calcium and magnesium content of lime-dried sludge is 27%, the content of particles below 5mm is 76%, and the moisture content is 26%.

[0027] Add appropriate amount of water to the above-mentioned inorganic mixture and mix it in a centralized factory. After fully mixing, when it is used for the sub-base of the road surface, the tested physical performance indicators are as follows:

[0028] Dry density is 1.55g / cm 3 , the water content is 21%, and the 7d unconfined compressive strength is 0.67Mpa.

[0029] Therefore, the inorganic mixture prepared in Example 1 meets the relevant technical requirements when used in the pavement sub-base.

Embodiment 2

[0031] The composition of the inorganic mixture is (Kg):

[0032] Lime dried sludge 350

[0033] lime 40

[0034] Fine-grained soil 700

[0035] Among them, the effective calcium and magnesium content of lime-dried sludge is 24%, the content of particles below 5mm is 73%, and the moisture content is 28%.

[0036] Add appropriate amount of water to the above-mentioned inorganic mixture and mix it in a centralized factory. After fully mixing, when it is used for the sub-base of the road surface, the tested physical performance indicators are as follows:

[0037] Dry density is 1.60g / cm 3 , the water content is 19%, and the 7d unconfined compressive strength is 0.71Mpa.

[0038] Therefore, when the inorganic mixture prepared in Example 2 is used for the pavement sub-base, it meets the relevant technical requirements.

Embodiment 3

[0040] The composition of the inorganic mixture is (Kg):

[0041] Lime dried sludge 400

[0042] cement 40

[0043] Fine-grained soil 750

[0044] Among them, the effective calcium and magnesium content of lime-dried sludge is 29%, the content of particles below 5mm is 69%, and the moisture content is 31%.

[0045] Add appropriate amount of water to the above-mentioned inorganic mixture and mix it in a centralized factory. After fully mixing, when it is used for the sub-base of the road surface, the tested physical performance indicators are as follows:

[0046] Dry density is 1.58g / cm 3 , the water content is 20%, and the 7d unconfined compressive strength is 1.75Mpa.

[0047] Therefore, when the inorganic mixture prepared in Example 3 is used for the pavement subbase, it meets the relevant technical requirements.

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Abstract

The invention discloses an inorganic mixture prepared by a lime dried sludge. The lime dried sludge product is mixed with cementing materials such as fly ash, lime, cement and the like for stabilizing fine-grained soil to obtain a mixture, the prepared mixture is used for pavement sub-bases of second level and below second level roads or city sub-arterial roads and lower level roads, and replaces a common inorganic mixture. Performance indexes of the lime dried sludge are that: the effective calcium and magnesium content is greater than 20%, the content of particles with the particle size of 5 mm or less is greater than 65%, and the moisture content is 20% to 40%. The inorganic mixture provided by the invention can consume the city dried sludge with large scale, solves sludge disposal problem, and prevents secondary pollution; the inorganic mixture has good mechanical and durability properties, and can meet application requirements of the second level and the lower level road sub-bases; and the inorganic mixture as city solid waste has much lower raw material price than natural stone material, and thereby reducing production cost.

Description

technical field [0001] The invention relates to the technical field of road pavement subbase materials, in particular to an inorganic mixture prepared from lime-dried sludge. Background technique [0002] With the expansion and new construction of sewage plants, the amount of sludge is also increasing. In 2008, Beijing's sludge output reached 1.035 million tons (water content 80%), including 866,000 tons in the central urban area and 169,000 tons in the suburban counties. It is estimated that the annual sludge output in Beijing will reach 2 million tons (with a moisture content of 80%) in 2020, and the output will be astonishing. The transportation distance has increased significantly, the disposal sites have shrunk day by day, and the cost of sludge disposal has increased sharply, which has brought great difficulties and pressures to the construction and operation of sewage treatment plants. Therefore, there is an urgent need to seek and establish technologies and approac...

Claims

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Application Information

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IPC IPC(8): E01C3/00C04B28/00
Inventor 崔丽张汎崔宁王晓江毛世春张岫王凤平
Owner 北京市政路桥科技发展有限公司
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