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Preparation method of solidified salinized soil

A saline soil and activated magnesia technology, applied in soil protection, construction, roads, etc., can solve the problems of weak salt erosion resistance, low strength of cement-cured saline soil, and difficulty in ensuring the strength of solidified soil, etc., to achieve convenient Preservation, simple operation, low cost effect

Inactive Publication Date: 2014-03-05
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The use of curing agents to cure foundation soil is a commonly used foundation treatment technology, but because saline soil contains a variety of salts and has a high salt content, the effect of using commonly used curing agents to cure saline soil is not ideal
For example: the most commonly used curing agent - cement, its hydration product that plays a major role in the strength of the solidified soil is mainly calcium silicate hydrate (CSH), a large amount of sulfate, chloride, carbonate in saline soil etc., seriously affect the formation and stable existence of CSH, resulting in very low strength of cement-cured saline soil
At the same time, due to the long-term existence of a large number of salt ions in the soil, the salt erosion resistance of cement-cured saline soil is very weak. Therefore, it is difficult to ensure the strength of the solidified soil and meet the engineering durability requirements by using cement to solidify the saline soil.
However, in other existing soil stabilizers, the hydration product that provides the strength of the stabilized soil is still mainly CSH, so there are all the above-mentioned curing problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A kind of chlorine saline soil has a salt content of 2%, and the main salt ion content is: Ca 2+ :, 0.36%, Mg 2+ : 0.21%, K + and Na + : 0.49%, SO 4 2- : 0.21%, Cl - : 0.72%, HCO 3 - : 0.005%; water content 22%. Component (i) is selected as slag; component (ii) is active magnesium oxide obtained by light burning of magnesite; component (i): component (ii): saline soil=6%: 2%: 92% . Mix the dry powder of component (i) and component (ii) evenly and grind until the specific surface area is 350m 2 / kg, turn the chlorine saline soil in the sun to adjust the water content to about 15.5% of the optimum water content, mix components (i), component (ii) and saline soil evenly to form solidified saline soil, and use a stand The paving machine spreads and rolls the solidified saline soil to a maximum dry density of 1.8g / cm 3 , forming a solidified soil subgrade with a certain bearing capacity and stability.

Embodiment 2

[0024] According to the engineering investigation report, it is known that the salt content of a certain chlorine saline soil is: 5.1%, and the main ion content is: Ca 2+ : 0.21%, Mg 2+ : 0.34%, K + and Na + : 1.66%, SO 4 2- : 0.5%, Cl - : 2.14%, HCO 3 - : 0.05%, CO 3 2- : 0.06%; water content is 36%. Component (i) is selected as slag; component (ii) is activated magnesia containing calcium oxide obtained by light burning of dolomite; component (i): component (ii): saline soil=12%: 3%: 85%. Mix the dry powder of component (i) and component (ii) evenly and grind until the specific surface area is 400m 2 / kg, and then use the powder spraying method to mix the powder formed by mixing components (i) and (ii) with the in-situ saline soil at the designed depth in the foundation and mix evenly, and lift while stirring to form solidified salt in the soil Stain pile. After the quality inspection of the pile body, the strength of the solidified saline soil pile reached 4.5M...

Embodiment 3

[0026] A kind of seabed chlorine saline mud has a water content of w=120%, a salt content of 2.7%, and the main ion content is: Ca 2+ : 0.24%, Mg 2+ : 0.14%, K + and Na + : 0.92%, SO 4 2- : 0.34%, Cl - : 0.98%, HCO 3 - : 0.02%, CO 3 2-: 0.03%; select component (i) to be the composition of slag and phosphorus slag, wherein the mass percentage of slag accounts for 75%; component (ii) is the composition of active magnesium oxide and unslaked lime prepared by brine-ammonia precipitation calcination, Among them, the mass percentage of active magnesium oxide accounts for 70%; component (i): component (ii): saline soil = 15%: 5%: 80%. Mix the powders of component (i) and component (ii) evenly and grind until the specific surface area is 350m 2 / kg, using pipeline pneumatic stirring transmission solidification technology, the mixed powder of component (i) and component (ii) and the salted sludge pumped from the subsea pump are mixed and stirred in the pneumatic transmission ...

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PUM

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Abstract

The invention relates to a preparation method of solidified salinized soil. The preparation method is characterized by comprising the steps of uniformly mixing one or more compositions of mineral powder containing active aluminum and silicon and having potential hydraulicity or volcanic ash character and active magnesium oxide or active magnesium oxide and lime composition with salinized soil with salt content of 0.5 to 20 percent and water content of 20 and 150 percent according to the mass percentage of (3.5% - 28.5%): (0.5% -10.5%): (70% - 95%), molding according to a design process, and obtaining the solidified salinized soil with the strength and duration meeting the engineering requirements. The prepared solidified salinized soil can be used for constructing a road foundation or a simple road, filling foundation and producing the solidified salinized soil column in the soil.

Description

(1) Technical field: [0001] The invention relates to a preparation method of solidified saline soil suitable for solidification of saline soil, belonging to the field of civil engineering foundation treatment. (2) Background technology: [0002] When the soluble salt content in the rock and soil is more than 0.3%, and has engineering characteristics such as dissolution, salt expansion, and corrosion, the rock and soil are called saline soil. Due to its physical, chemical and mechanical properties are very different from general rock and soil, it is listed as special soil in the field of engineering geology and foundation engineering. Saline soil is widely distributed in our country. With the rapid development of our country's economy, the national coastal strategy and the western development strategy are further promoted, more and more basic engineering constructions are located in saline soil areas. There are also more and more problems in the treatment of soil-stained fou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/08C04B28/10E02D3/12E01C3/04
Inventor 程寅于浩黄新
Owner BEIHANG UNIV