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Curing method for saline soil

A curing method and technology of saline soil, which is applied in the field of construction engineering, transportation and road engineering construction, can solve the problems of destroying the cemented structure, failing to achieve the expected effect, and failing to obtain satisfactory results, so as to speed up the formation rate and eliminate the solidified soil structure The effect of loosening and solving curing problems

Inactive Publication Date: 2008-10-01
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in saline soil areas, due to the high salt content in the soil, the sulfate in it reacts with calcium, aluminum and other components in the curing agent to generate swelling, which destroys the cemented structure formed by the curing agent in the soil, so it often fails to meet expectations. Effect
Although many researchers have proposed different curing agents in an attempt to solve the problem of curing saline soil, satisfactory results cannot be obtained, especially for saline soil with high salt content.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In a saline soil area, the salt content is 4%, and the sulfate ion content reaches 1.7%. The saline soil is solidified and consolidated. The amount of curing agent accounts for 12% of the saline soil sample mass. The mass ratio of curing agent is as follows: high alumina cement: lime: steel slag = 1:1:4; mix all components evenly and grind to a fineness of 400m 2 / kg. The curing agent and the saline soil sample were mixed evenly by deep stirring method, and compacted after 15 days. Due to the rapid reaction of high-alumina cement, lime and sulfate ions in saline soil samples to form expansive product ettringite, the sulfate ions in saline soil samples are consumed; after compaction, the loose soil samples expand into structures For denser soil, the steel slag undergoes hydration reaction to form a gelled product, which cements the soil and ettringite and produces a certain strength, so the saline soil foundation has higher strength and can be used as a roadbed.

Embodiment 2

[0022] In a saline soil area, the salt content is 2%, and the sulfate ion content is 0.9%. The saline soil is solidified and consolidated. The amount of curing agent accounts for 18% of the saline soil sample mass. The mass ratio of the solidifying agent is as follows: the dehydrated phase of the hydrate obtained from fly ash: lime: cement=2: 1: 3; the dehydrated phase is mixed with lime first, and mixed evenly with the saline soil sample by deep layer stirring; 7d Then the cement is mixed with the saline soil sample after one stirring, and then rolled again. After the dehydrated phase, lime and sulfate ions of the saline soil sample react quickly to form ettringite, the sulfate ions are consumed, and the soil sample expands at this time, but its strength is low; when it is stirred with cement again and rolled , Rolling compacts the soil structure, and at the same time, cement binds the loose soil samples and produces a certain strength. Can be used as roadbed.

Embodiment 3

[0024] In a saline soil area, the salt content is 2%, and the sulfate ion content is 1.2%. The saline soil was solidified and reinforced by powder spraying pile method. The amount of curing agent accounts for 24% of the saline soil sample mass. The mass ratio of curing agent is as follows: sulphoaluminate cement: quicklime: slag=2:1:3. Mix the curing agent evenly, and mix the curing agent and the soil sample evenly by powder spraying method, and compact the pile after 7 days. The pile parameters are as follows: diameter 1.2m, spacing 1.0m, pile depth 4.5m.

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Abstract

A saline soil solidifying method is disclosed, whose basal principle uses the reaction of salinity producing katogene and added firming agent to generate a dilatability outcome yield, which allows the dilatability destroy to take place ahead, the dilatability structure becomes dense from loose by pressing dense, finally the gel component cements the saline soil. The used firming agent includes component i (aluminiferous component), component ii (calcium containing component), component iii (cementing component, with a slower generating velocity), and the doped amount is 1-30% of the mass of the saline soil. The usage mode of the firming agent includes stirring component i, component ii and the saline soil and waiting for 1-30d, doping in component iii after pressing, which can be used as road bed, pavement, or producing saline soil brick; simultaneously adding component i, component ii and component iii in the saline soil, pressing after waiting for 1-20d, which can be used as road bed, pavement, or producing saline soil brick; and also being capable of taking component i, component ii and component iii as firming agent of deep layer padding process and the like for deep consolidation of salination land base.

Description

(1) Technical field [0001] The invention provides a saline soil solidification method, and proposes a new method for consolidating saline soil by using a special curing agent combined with a special construction process, which belongs to the field of construction engineering and the technical field of transportation road engineering construction. (2) Background technology [0002] Mixing soil with cement, lime or other curing agents evenly to make solidified soil is a very widely used soft soil reinforcement technology. For example: mix the soil with cement, lime or other curing agents and pave and compact to form a solidified soil layer, which is often applied to the roadbed of simple roads or low-grade roads; or use deep mixing method, rotary spraying method, powder spraying pile In-situ stirring and mixing of cement, lime or other curing agents with the deep soft soil of the foundation is a very widely used foundation reinforcement method. [0003] my country's saline so...

Claims

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Application Information

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IPC IPC(8): E02D3/12E01C3/04E01C7/36C09K17/00
Inventor 黄新李战国邓晓轩朱宝林饶波华
Owner BEIHANG UNIV
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