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An underground densified cemented saline soil column for supersulfuric acid saline soil

A technology of saline soil and supersulfuric acid, which is applied in the field of civil engineering, can solve the problems of corrosion of reinforced concrete, threats to the durability of concrete and reinforced concrete structures, etc., and achieve the effects of reducing engineering costs, simple construction methods and good durability.

Inactive Publication Date: 2015-09-23
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The salt content of the supersulfate saline soil area around the salt lake can be as high as 46.9%, and the supersulfate saline soil will cause severe chemical corrosion and physical crystallization corrosion to the concrete prepared with Portland cement, resulting in corrosion of reinforced concrete, and damage to concrete and Durability of reinforced concrete structures poses a serious threat

Method used

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  • An underground densified cemented saline soil column for supersulfuric acid saline soil
  • An underground densified cemented saline soil column for supersulfuric acid saline soil
  • An underground densified cemented saline soil column for supersulfuric acid saline soil

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Effect test

Embodiment 1

[0046] Underground densified and cemented saline soil columns are used to reinforce the foundation in a supersulfur saline soil area. According to the engineering survey report, the salt content of saline soil is 5.85%, and the main ion composition and content are Ca 2+ : 0.09, Mg 2+ : 0.07,K + and Na + : 2.35%, SO 4 2- : 2.72%, Cl - : 0.59%, HCO 3 - : 0.03%, the water content of saline soil is 32.4%.

[0047] An underground densified cemented saline soil column for supersulfuric acid saline soil and a construction method thereof according to the present invention are adopted. The design column length is 8m, the cross section is 40cm×40cm, and the strength requirement of the cemented saline soil is 5.2Mpa; the composition of the cemented material selected by weight is as follows: 100 parts of light-burned magnesium oxide, 100 parts of magnesium sulfate, 3 parts of citric acid, citric acid 10 parts of sodium, 3 parts of sodium dihydrogen phosphate, 5 parts of calcium s...

Embodiment 2

[0050] Underground densified and cemented saline soil columns are used to strengthen the foundation in a supersulfite saline soil area. According to the engineering survey report, the salt content of saline soil is 15.37%, and the main ion composition and content are Ca 2+ : 1.24%, Mg 2+ : 0.22%, K + and Na + : 4.74%, SO 4 2- : 6.49%, Cl - : 2.24%, HCO 3 - : 0.30%, CO 3 2- : 0.12%, the water content of saline soil is 28.4%.

[0051] An underground densified cemented saline soil column for supersulfuric acid saline soil and a construction method thereof according to the present invention are adopted. The design column length is 9.0m, the pile diameter is 35cm, and the strength requirement of the cemented saline soil is 7.0Mpa; the composition of the cemented material selected by weight is as follows: 250 parts of light-burned magnesium oxide, 125 parts of magnesium sulfate, 5 parts of citric acid, citric acid 5 parts of sodium, 5 parts of oxalic acid, 5 parts of sodi...

Embodiment 3

[0054] Underground densified and cemented saline soil columns are used to strengthen the foundation in a supersulfuric acid saline soil area. According to the engineering survey report, the salt content of saline soil is 37.42%, and the main ion composition and content are Ca 2+ : 0.09, Mg 2+ : 1.54%, K + and Na + : 13.79%, SO 4 2- : 18.09%, Cl - : 3.88%, HCO 3 - : 0.03%, the water content of saline soil is 17.5%.

[0055]An underground densified cemented saline soil column for supersulfuric acid saline soil and a construction method thereof according to the present invention are adopted. The designed column length is 11.0m, the pile diameter is 40cm, and the strength requirement of the cemented saline soil is 7.4Mpa; the composition of the cemented material selected by weight is as follows: 500 parts of light-burned magnesium oxide, 150 parts of magnesium sulfate, 8 parts of citric acid, citric acid 8 parts of sodium, 3 parts of phosphoric acid, 3 parts of oxalic aci...

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Abstract

The invention discloses an underground densifying cementation saline soil column for super sulfate saline soil and a construction method thereof, belonging to the field of civil engineering. For the foundation of a super sulfate saline soil place with salt content of 5.02-46.9% and with specific salt type and content, the method comprises the following steps of: fetching a mixture of light calcined magnesia, magnesium sulfate, a mineral admixture and an additive as a cementing material; controlling the water content of the saline water so that the cementation saline soil formed by uniformly mixing the cementing material and the saline soil is near the optimal water content; embedding a sleeve with a temporarily plugged lower end into the designed depth of the saline soil foundation; gradually filling the cementation saline soil in the sleeve and densifying until the dry density is near the maximum dry density; and finally, forming an underground densifying cementation saline soil column. The underground densifying cementation saline soil column disclosed by the invention can solve the problem of insufficient bearing capacity and durability of the existing foundation treatment method for the foundation of a super sulfate saline soil region.

Description

technical field [0001] The invention relates to an underground densified cemented saline soil column for supersulfuric acid saline soil and a construction method thereof, belonging to the field of civil engineering. Background technique [0002] The area of ​​my country's salt lake belt accounts for about half of the country's land area, mainly concentrated in the Xinjiang salt lake area, Tibet salt lake area, Qinghai salt lake area and Inner Mongolia salt lake area, and a considerable part of it is supersulfuric acid saline soil. The salt content of the supersulfate saline soil area around the salt lake can be as high as 46.9%, and the supersulfate saline soil will cause serious chemical corrosion and physical crystallization corrosion to the concrete prepared with Portland cement, resulting in corrosion of reinforced concrete and damage to concrete and The durability of reinforced concrete structures poses a serious threat. Therefore, there is an urgent need to develop fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40E02D3/00E02D3/12C09K103/00
Inventor 李世洋刘庆伟于浩李建猛黄新
Owner BEIHANG UNIV
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