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Polyvinyl alcohol saturated limewater expansive soil conditioner, preparation method and application thereof

A soil conditioner and polyvinyl alcohol technology, which is applied in the field of geotechnical engineering, can solve the problems of complicated construction, imperfect test results, high price, and achieve good penetration effect.

Inactive Publication Date: 2010-10-06
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 still in the stage of indoor experiments. This is not only related to the incompleteness of the test results, but the construction is complicated or expensive. High is also the main reason

Method used

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Experimental program
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Effect test

Embodiment

[0025] Embodiment: Utilize polyvinyl alcohol saturated lime water 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 100g of a soil sample at a depth of 90cm , crush all 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; place the neckless funnel on the bracket, Keep 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 measurement and weighing, requiring that the difference betw...

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Abstract

The invention discloses an expansive soil conditioner, which is solution prepared by polyvinyl alcohol and saturated limewater according to a certain weight ratio; and the preparation method comprises the following steps: taking the polyvinyl alcohol and the saturated limewater 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 limewater, placing in the water bath for a certain time, and taking supernatant liquid which is used as the conditioner of the saturated limewater solution of the polyvinyl alcohol; and spraying the conditioner on the surface of dry expansive soil, carrying out the second spraying of the conditioner after the surface of the expansive soil is dry and carrying out a plurality of times of spraying of the conditioner in such way, thereby forming a surface conditioning layer with a certain thickness and eliminating or reducing expansion and contraction properties of a coil body in the conditioning layer; and the test result shows that the free expansion ratio of the expansive soil which is taken out from 90cm to the soil surface is reduced from the original 50 to 27 through the free expansion test, thereby meeting the requirement of engineering construction.

Description

technical field [0001] The present invention relates to an expansive soil improver, in particular to a polyvinyl alcohol saturated lime water expansive soil improver that reduces the swelling and shrinkage of expansive soil, its preparation method and its application in improving expansive soil, belonging to rock and soil field of engineering technology. 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 protect...

Claims

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Application Information

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IPC IPC(8): C09K17/48E02D3/12E02D17/20C09K103/00
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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