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
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[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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