Polyvinyl alcohol water solution expansive soil modifier, preparation method and application thereof

A technology of polyvinyl alcohol and soil improver, which is applied in the field of expansive soil improver and polyvinyl alcohol aqueous solution expandable soil improver, which can solve the problems of complex construction, incomplete test results, and high price, and achieve good penetration effect

Inactive Publication Date: 2010-09-29
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method of improving expansive soil by combining inorganic modifiers and organic modifiers has not been popularized and applied in actual engineering so far, and the results are

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0025] Embodiment: Utilize polyvinyl alcohol aqueous solution improver to the test of expansive soil improvement:

[0026] The improvement construction steps are: (1) Take a 200kg expansive soil sample from Huai'an City, Jiangsu Province, put it in a cylindrical glass vessel with a height of 1m and a diameter of 30cm, and take out the soil sample at a depth of 90cm from the surface 100 grams, crushed and passed through a 0.55 sieve; mix the sieved sample evenly, bake at 105°C-110°C to constant weight, and cool to room temperature in a desiccator; put the neckless funnel on the bracket, under the funnel Keep the mouth at a distance of 10mm from the soil measuring cup; take the sample with a spoon and pour it into the funnel, stirring while pouring. When the sample fills the soil measuring cup and starts to flow out, stop pouring the soil, remove the funnel to scrape off excess soil from the mouth of the cup and weigh it. Repeat the above operations for the second soil measurem...

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PUM

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Abstract

The invention discloses an expansive soil modifier, which is solution prepared by polyvinyl alcohol and water according to a certain weight ratio; and the preparation method comprises the following steps: taking the polyvinyl alcohol and the water according to the certain weight ratio, doping an appropriate amount of anhydrous ethanol, heating the mixture in a water bath, fully stirring, dissolving the polyvinyl alcohol in the water, placing for a certain time in the water bath, taking supernatant liquor, and obtaining saturated water solution of the polyvinyl alcohol as the modifier. The modifier is sprayed on the surface of dry expansive soil, the second spraying of the modifier is carried out after the surface of the expansive soil is dry, after a plurality of times of spraying of the modifier, a surface modification layer with a certain thickness can be formed, thereby eliminating or reducing the expansion-shrinkage property of a soil body in the modification layer; and the test result shows that the free expansion rate of the expansive soil which is taken out from 90cm to the soil surface is reduced from the original 50 to 37 through the free expansion test, thereby meeting the requirements of engineering construction.

Description

technical field [0001] The invention relates to an expansive soil improver, in particular to a polyvinyl alcohol aqueous solution expansive soil improver for reducing swelling and contraction of expansive soil, a preparation method and application thereof. It belongs to the technical field of geotechnical engineering. Background technique [0002] Expansive soil has been found in most areas of our country. When using expansive soil as engineering soil, it must be further processed due to its large expansibility. There are two types of methods to reduce the expansion and contraction of expansive soil and increase the stability of expansive soil foundation and slope: physical method and chemical method. [0003] Physical methods are: [0004] (1) Surface water protection: set up various drainage ditches and establish a surface drainage network system to make it difficult for surface water to seep into the soil; [0005] (2) Slope protection. At present, the main reinforceme...

Claims

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Application Information

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IPC IPC(8): C04B14/12
Inventor 张福海洪望曦潘雨辰赵辰洋邱雪莲谭欣
Owner HOHAI UNIV
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