Soil engineering gasket suitable for environment containing multivalent cation mineral and preparation method thereof

A technology of polyvalent cations and minerals, which is applied in the field of environmental geotechnical engineering and civil engineering, can solve the problems of weakening expansibility, reducing, and reducing the functional effectiveness of bentonite, and achieves increased permeability, good osmotic expansibility, and stable permeability coefficient Effect

Inactive Publication Date: 2012-06-27
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, when calcium ions are present in the ion exchange process (including the pore water solution), the multivalent cations in the sodium bentonite mineral components are replaced by monovalent cations, which reduces or weakens the expansibility, thereby reducing the effectiveness of the bentonite function; and Similarly, high concentrations of monovalent solutions also limit osmotic swelling

Method used

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  • Soil engineering gasket suitable for environment containing multivalent cation mineral and preparation method thereof
  • Soil engineering gasket suitable for environment containing multivalent cation mineral and preparation method thereof
  • Soil engineering gasket suitable for environment containing multivalent cation mineral and preparation method thereof

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Experimental program
Comparison scheme
Effect test

preparation example Construction

[0025] The preparation method of the above-mentioned geotechnical liner applicable to the environment containing polyvalent cation minerals comprises the following steps:

[0026] 101: Preparation of nano-bentonite composite material;

[0027] 102: Fix and connect the nano-bentonite composite material 3 prepared in step 101 between the first geotechnical layer 1 and the second geotechnical layer 2 .

[0028] The step 101 specifically includes the following steps 1011-1014:

[0029] 1011. Dilute acrylic acid with a concentration ≥99.0% to 20%-25% with distilled water or deionized water, and shake evenly to form acrylic acid dilution.

[0030] 1012. Slowly add the sodium-based bentonite powder ground to the nanometer scale into the acrylic acid diluent in step 1011, mix and oscillate evenly to form a bentonite grinding liquid; wherein, the sodium-based bentonite powder accounts for 30%-50% of the weight of the acrylic acid diluent %.

[0031] 1013. Add sodium peroxodisulfate ...

Embodiment 1

[0038] Experimental conditions:

[0039]About calcium chloride solution: Calcium chloride solution is prepared by dissolving calcium chloride dihydrate salt in deionized water. The calcium ion concentration in the calcium chloride solution is tested by an inductively coupled plasma spectrometer,

[0040] The test procedures follow the national standard (GB / T 50123-1999).

[0041] About the geotechnical liner: the geotechnical liner suitable for the environment containing polyvalent cation minerals prepared according to the preparation method provided by the present invention.

[0042] About the expansion index test: follow the national standard (GB / T 50123-1999). 100% of the material passed through a 200-mesh standard sieve.

[0043] Regarding the permeability test: it is carried out by a flexible wall permeameter, following the national standard (GB / T19979.2-2006).

[0044] experiment procedure:

[0045] In the calcium chloride solution with a concentration of less than ...

Embodiment 2

[0049] The experimental conditions and experimental process of Example 2 are the same as those of Example 1, except that the concentration of the calcium chloride solution in the experimental process is 55 mM.

[0050] Experimental results: The expansion index of the geotechnical liner suitable for the environment containing polyvalent cation minerals in this technical scheme is an expansion index of 46.55mL / 2g, and the permeability coefficient is 1.8×10 -10 cm / s.

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Abstract

The invention discloses a soil engineering gasket suitable for an environment containing multivalent cation mineral and a preparation method thereof. The soil engineering gasket is fixedly connected between a first soil engineering layer and a second soil engineering layer by a nano bentonite composite material. The preparation method of the soil engineering gasket comprises: step 101, preparing the nano bentonite composite material: diluting acrylic acid to obtain acrylic acid diluent; adding sodium bentonite powder into the acrylic acid diluent to form bentonite grinding fluid; adding sodium persulfate solution into the bentonite grinding fluid, and adding sodium hydroxide powder to form composite bentonite slurry; and drying the composite bentonite slurry and grinding to obtain the nano bentonite composite material; and step 102, connecting the nano bentonite composite material between the first soil engineering layer and the second soil engineering layer. The soil engineering gasket is used in an environment containing multivalent cation mineral, and has stable permeability coefficient and good anti-seepage performance. The preparation method has a simple process and a short period.

Description

technical field [0001] The invention belongs to the technical field of civil engineering and environmental geotechnical engineering, and specifically relates to a geotechnical liner suitable for an environment containing polyvalent cation minerals, and the geotechnical liner can be used in anti-seepage engineering, including landfill seepage , Capping system; seepage prevention at the bottom of oil storage tanks and oil depots; waterproofing of artificial lakes, reservoirs and sewage pools. At the same time, the invention also provides a preparation method of a geotechnical liner suitable for the environment containing polyvalent cation minerals. Background technique [0002] The traditional sodium-based bentonite liner has high expansibility and high water absorption capacity, and is mainly used for the isolation of pollutants. The semi-permeable membrane effect of sodium-based bentonite makes it effective in reverse osmosis and anti-diffusion. However, the segregation abi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D31/00E02B3/16B28C1/00B28C1/04
Inventor 杜延军魏明俐
Owner SOUTHEAST UNIV
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