Method for improving expansive soil by waste foundry sand and construction method

A technology for expansive soil and soil improvement, which is applied in soil protection, infrastructure engineering, construction and other directions to achieve the effect of improving the strength of expansive soil, protecting the environment and saving engineering costs

Inactive Publication Date: 2009-05-06
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to overcome the above defects. The present invention provides a method for improving expansive soil with waste foundry sand and a construction method for improving expansive soil with obtained waste foundry sand, which can effectively solve the problem of expansive soil expansion, shrinkage, deformation and damage. Improve the strength of expansive soil, easy to popularize

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The mixture was prepared to prepare 1 kg of the mixture. The process steps of mixture preparation are as follows: (1) The mass of dry soil to be improved is 0.8kg, and the mass percentage is 25% (quality of foundry waste sand: mass of dry soil = 1:4) and weigh the required foundry waste sand After the mass of 0.2kg (2) is mixed evenly, the best moisture content obtained from the heavy compaction test in the "Highway Soil Test Regulations" (JTJ-051-93) is 15.1%wt, and 151g of water is added to the mixture. Layer with water and mix to prevent lumps from forming.

[0030] The steps of the improved construction method are: laying the prepared foundry waste sand-improved dry soil mixture to form a surface improvement layer with a thickness of 40 cm required by the project.

[0031] Improvement effect: (1) Expansion and contraction: According to the total expansion rate test of "Highway Soil Test Regulations" (JTJ-051-93), the total expansion rate of pure expansive soil is 2...

Embodiment 2

[0033] A method for improving expansive soil with waste foundry sand, the steps are:

[0034] The first step, according to the quality of the waste foundry sand: the dry soil mass of the required improved soil = 1:5 ratio, weigh the waste foundry sand and the improved soil, and mix them evenly; the composition of the waste foundry sand is as follows: Mass percentage ratio meter: 41% of quartz sand, 37% of coal powder, 19% of pottery clay, and 3% of iron. The quartz sand contains SiO 2 85%wt.

[0035] The second step is to determine the optimum water content according to the heavy compaction test in the "Highway Soil Test Regulations" (JTJ-051-93);

[0036] The third step is to add water to the mixed soil obtained in the first step according to the determined optimal water content. Water can be sprinkled and mixed layer by layer to make the water evenly dispersed in the mixture, and the waste foundry sand can be obtained by stirring evenly to improve expansive soil. .

[00...

Embodiment 3

[0039] A method for improving expansive soil with waste foundry sand, the steps are:

[0040] The first step, according to the quality of the waste foundry sand: the dry soil mass of the required improved soil = 1:3 ratio, weigh the waste foundry sand and the improved soil, and mix them evenly; the composition of the waste foundry sand is as follows: Mass percentage ratio meter: 41% of quartz sand, 37% of coal powder, 19% of pottery clay, and 3% of iron. The quartz sand contains SiO 2 85%-95%wt.

[0041]The second step is to determine the optimum water content according to the heavy compaction test in the "Highway Soil Test Regulations" (JTJ-051-93);

[0042] The third step is to add water to the mixed soil obtained in the first step according to the determined optimal water content. Water can be sprinkled and mixed layer by layer to make the water evenly dispersed in the mixture, and the waste foundry sand can be obtained by stirring evenly to improve expansive soil. .

...

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Abstract

The invention discloses a method for modifying expansive soil by waste foundry sand, which comprises the following steps: step one, according to the proportion of between 1 to 5 and 1 to 3 of the mass of the waste foundry sand to the mass of dry soil of a soil body needing to be improved, weighing the waste foundry sand and the soil body to be improved, and mixing the waste foundry sand and the soil body evenly, wherein the components of the waste foundry sand in mass percentage are: 41 percent of quartz sand, 37 percent of coal dust, 19 percent of clay and 3 percent of iron; step two, determining the optimum moisture content; and step three, adding water to the mixed soil obtained in the step one, and stirring the mixture evenly to obtain waste foundry sand improved expansive soil. The method for using the waste foundry sand to improve the expansive soil is utilized to obtain a construction method for using the waste foundry sand to improve the expansive soil. With a method for constructing the waste foundry sand improved expansive soil which is obtained by the method for improving the expansive soil by the waste foundry sand, the obtained waste foundry sand improved expansive soil is paved as a surface improved layer the thickness of which is between 30 and 60 centimeters on the construction surface; and then the surface improved layer is kept for 3 to 7 days under natural condition, and the improved soil body has a chemical reaction with the components of the waste foundry sand to eliminate or reduce the swell-shrink characteristics of the soil body in the improved layer, thus the strength required by an engineering can be achieved.

Description

technical field [0001] The invention relates to a method for improving expansive soil, in particular to a method for selecting waste foundry sand and improving the strength of expansive soil and reducing expansion deformation. It belongs to the field of geological disaster treatment and geotechnical engineering technology. Background technique [0002] So far, the improvement methods of expansive soil mainly include: compaction method, physical improvement method, chemical improvement method, moisture retention method, soil replacement method and biological improvement method. [0003] (1) The compaction method is to compact the expansive soil to the required density. The compaction method is low in cost, but has certain applicability limitations. It is generally suitable for weak expansive soil foundations. After compaction, the density of the expansive soil foundation will increase, and the cohesion and internal friction angle will also increase, and the bearing capacity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B20/02C04B14/12E02D3/00C04B14/06
Inventor 孙树林张鑫魏永耀盘霞
Owner HOHAI UNIV
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