A method of improving swelling soil roadbed filling material by using waste carbide slag

A technology of carbide slag and soil roadbed, applied in the fields of geotechnical engineering, expansive soil treatment, road engineering, water conservancy engineering, can solve the problems of aggravating the global warming trend, reducing the project cost, unfavorable emission reduction policies, etc., to achieve a good economic Benefit, emission reduction, good social benefit effect

Inactive Publication Date: 2011-08-24
SOUTHEAST UNIV
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  • Abstract
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Problems solved by technology

The price difference between the two is significant. If calcium carbide slag can be used instead of quicklime to improve expansive soil, the project cost can be greatly reduced; in addition, quicklime

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  • A method of improving swelling soil roadbed filling material by using waste carbide slag
  • A method of improving swelling soil roadbed filling material by using waste carbide slag
  • A method of improving swelling soil roadbed filling material by using waste carbide slag

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Embodiment Construction

[0016] Below in conjunction with laboratory test result the present invention is described in more detail:

[0017] The effect of calcium carbide slag improving expansive soil is planned to be evaluated through the combination of indoor test and theoretical analysis, mainly from the physical and mechanical properties of calcium carbide slag improving expansive soil.

[0018] 1) Basic properties of expansive soil: the test soil is taken from a certain place in Anhui, with a free expansion rate of 76%, which belongs to strong expansive soil, and its basic index is liquid limit w L =142.4%, plastic limit w p =40.8%, the natural water content of the soil w=30.5%, the content of fine particles (particle sizedmax =1.21g / cm 3 , the optimal water content w op =25.2%, the expansion under the load of 50kPa is 13.35%.

[0019] 2) Basic properties of carbide slag: the basic physical and chemical properties and chemical composition of the selected carbide slag are shown in Table 1 and T...

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Abstract

Presently, research on swelling soil curing agent is still immature and economical special curing agent having high performance is lacking. The invention provides a method, which takes industrial waste carbide slag as a raw material, of improving swelling soil roadbed filling material by using waste carbide slag. In the method, carbide slag is used as the curing agent for improving the swelling soil roadbed. The method includes the steps of adding carbide slag into the swelling soil and stirring uniformly. The water content in the process of adding the carbide slag into the swelling soil should be controlled in the range of 18 to 20 percents and the mass ratio of the dry carbide slag and the dry swelling soil is 6-10 to 100. By the invention, not only the cost of the curing agent is reduced and remarkable curing effect is achieved, but also the industrial waste carbide slag can be recycled, thereby playing a part in comprehensive utilization and environment protection.

Description

technical field [0001] The invention mainly relates to the technical field of expansive soil treatment, and belongs to the technical fields of geotechnical engineering, road engineering and water conservancy engineering. Background technique [0002] Expansive soil has the characteristics of swelling when exposed to water and shrinking due to water loss. If it is directly used as roadbed filler without modification, during and after construction, expansive soil roadbed filling will easily swell when it encounters water, and it will easily swell when it is dry. It is easy to shrink, leading to shrinkage cracking, swelling and other diseases in the subgrade base and pavement structural layer, shortening the service life of the pavement, and causing serious damage to the construction of the project. [0003] Due to the obvious expansion and contraction characteristics of expansive soil, it often causes huge damage to the project. The current roadbed design and construction regu...

Claims

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Application Information

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IPC IPC(8): E02D3/12
Inventor 杜延军陈志龙
Owner SOUTHEAST UNIV
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