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Modified ardealite roadbed material

A roadbed material, phosphogypsum technology, applied in the field of road engineering, can solve the problems of water stability not meeting the required requirements, phosphogypsum can not be compacted, ecological environment impact, etc., to meet the strength and elastic modulus requirements, The effect of high compaction and reduced environmental damage

Inactive Publication Date: 2018-08-17
王晓春
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In my country, with the development of the chemical industry, the discharge of phosphogypsum is constantly increasing, but the recycling rate is low, less than 20%, which leads to the accumulation of phosphogypsum around the phosphating plant, which not only takes up a lot of land resources, And it also has a serious impact on the ecological environment
In China, Tang Qingqian et al. conducted research on the feasibility and mechanical properties of phosphogypsum applied to roadbed and pavement engineering. During the construction of experimental embankments, it was found that phosphogypsum is sensitive to water. Therefore, the water content must be strictly controlled during construction; Shen Weiguo and others have developed a fly ash phosphogypsum pavement base material, which has a greatly improved early strength compared with ordinary fly ash (lime-fly ash) materials. However, the water stability performance does not meet the required requirements, so it cannot be popularized and applied.

Method used

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  • Modified ardealite roadbed material
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Take 15t of phosphogypsum, 15t of sand / clay, 5t of fly ash, 2t of quicklime as raw materials, and thoroughly mix and stir to obtain the base material; before construction, add curing agent to the base material, mix evenly, and add amount of curing agent Add 300g for every 1 cubic meter of base material. The curing agent is a potassium hydroxide aqueous solution with a mass concentration of 0.4-0.6%.

[0017] Use the base material with curing agent as the roadbed raw material for direct construction and use.

Embodiment 2

[0019] Take 40t phosphogypsum, 40t clay, 8t fly ash, and 3t calcium carbide slag as raw materials. After fully mixing and stirring, the base material is obtained; before construction, add curing agent to the base material and mix evenly. The amount of curing agent added is Add 500g to 1 cubic meter of base material. The curing agent is a mixture of a 4-6% calcium dodecyl sulfonate aqueous solution and a 4-6% calcium lignosulfonate aqueous solution with a mass concentration.

[0020] Use the base material with curing agent as the roadbed raw material for direct construction and use.

Embodiment 3

[0022] Use 30t phosphogypsum, 30t sand, 6t fly ash, 2.5t calcium carbide slag as raw materials, and fully mix and stir to obtain the base material; before construction, add curing agent to the base material, mix evenly, and add amount of curing agent Add 400g per cubic meter of base material. The curing agent is an aqueous solution of calcium dodecyl sulfonate with a mass concentration of 4-6%.

[0023] Use the base material with curing agent as the roadbed raw material for direct construction and use.

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Abstract

The invention relates to the technical field of road engineering and especially discloses a modified ardealite roadbed material. The modified ardealite roadbed material is characterized by being prepared from the raw materials of ardealite, aggregate / clay, coal ash, quick lime / acetylene sludge; the raw materials are mixed according to a certain weight ratio; a curing agent is added into the raw materials to prepare the modified ardealite roadbed material. A construction method of the modified ardealite roadbed material disclosed by the invention is simple; the modified ardealite roadbed material can meet roadbed strength and rebound modulus requirements, can effectively reduce occupancy of ardealite on farmland, reduces damage of the ardealite to the environment, reduces roadbed differential settlement, prolongs service life of road surfaces and is suitable for being widely applied to areas lacking filled earth and areas with higher ardealite yield.

Description

(1) Technical field [0001] The invention relates to the technical field of road engineering, in particular to a modified phosphogypsum roadbed material. (2) Background technology [0002] Phosphogypsum is an industrial by-product produced in the process of wet-process phosphoric acid production. According to reports, 4-5 tons of phosphogypsum are discharged for every ton of phosphoric acid produced. At present, the annual output of phosphogypsum in the world is about 110-1130 million. Tons, only a small amount has been used. Japan, Australia and other countries have developed many phosphogypsum recycling technologies due to shortage of land resources and lack of natural gypsum. The utilization rate of phosphogypsum is very high. In our country, with the development of the chemical industry, the discharge of phosphogypsum is continuously increasing, but the recycling rate is low, less than 20%, resulting in the accumulation of phosphogypsum around the phosphate chemical plant, whi...

Claims

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Application Information

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IPC IPC(8): C04B28/14
CPCC04B28/143C04B2201/20C04B14/06C04B14/10C04B18/08C04B22/064C04B18/0481C04B22/062C04B24/18C04B24/16
Inventor 王晓春王歆海王强苏孟梓苏华婷杜昕润杜昕宇马东明苏同兴
Owner 王晓春
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