CN115872720A - Sealant for bottom of vertical impervious curtain and preparation method thereof - Google Patents
Sealant for bottom of vertical impervious curtain and preparation method thereof Download PDFInfo
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- CN115872720A CN115872720A CN202211527915.9A CN202211527915A CN115872720A CN 115872720 A CN115872720 A CN 115872720A CN 202211527915 A CN202211527915 A CN 202211527915A CN 115872720 A CN115872720 A CN 115872720A
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- sealant
- impervious curtain
- vertical impervious
- curtain
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- 239000000565 sealant Substances 0.000 title claims abstract description 54
- 238000002360 preparation method Methods 0.000 title abstract description 9
- 239000004927 clay Substances 0.000 claims abstract description 21
- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical compound O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229940080314 sodium bentonite Drugs 0.000 claims abstract description 17
- 229910000280 sodium bentonite Inorganic materials 0.000 claims abstract description 17
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims abstract description 16
- 239000001768 carboxy methyl cellulose Substances 0.000 claims abstract description 16
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims abstract description 16
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims abstract description 16
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims abstract description 14
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 11
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 7
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 7
- -1 sodium silicate pentahydrate Chemical class 0.000 claims abstract description 6
- 239000002994 raw material Substances 0.000 claims abstract description 4
- 239000007787 solid Substances 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 230000035699 permeability Effects 0.000 claims description 21
- 238000003756 stirring Methods 0.000 claims description 16
- 239000011268 mixed slurry Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 7
- 238000010998 test method Methods 0.000 description 7
- HQAITFAUVZBHNB-UHFFFAOYSA-N sodium;pentahydrate Chemical compound O.O.O.O.O.[Na] HQAITFAUVZBHNB-UHFFFAOYSA-N 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- JHYGHPNIMTXWMG-UHFFFAOYSA-N [Si]([O-])([O-])([O-])[O-].[Si]([O-])([O-])([O-])[O-].[Si]([O-])([O-])([O-])[O-].[Si]([O-])([O-])([O-])[O-].[Si]([O-])([O-])([O-])[O-].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+] Chemical compound [Si]([O-])([O-])([O-])[O-].[Si]([O-])([O-])([O-])[O-].[Si]([O-])([O-])([O-])[O-].[Si]([O-])([O-])([O-])[O-].[Si]([O-])([O-])([O-])[O-].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+] JHYGHPNIMTXWMG-UHFFFAOYSA-N 0.000 description 3
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical class O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000002910 solid waste Substances 0.000 description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 239000005995 Aluminium silicate Substances 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 229960000892 attapulgite Drugs 0.000 description 1
- 229940092782 bentonite Drugs 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052625 palygorskite Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
Landscapes
- Sealing Material Composition (AREA)
Abstract
The invention relates to the technical field of environmental geotechnical engineering, and particularly discloses a sealant for the bottom of a vertical impervious curtain and a preparation method thereof. The solid component of the sealant for the bottom of the vertical impervious curtain consists of the following raw materials in percentage by weight: 68-75% of clay, 15-20% of sodium bentonite, 5-10% of barite powder, 0.5-1.0% of sodium silicate pentahydrate, 0.1-0.2% of carboxymethyl cellulose and 0.8-1.0% of polyacrylamide. The sealant for the bottom of the vertical impervious curtain provided by the invention improves the impermeability of the sealant and reduces the production cost.
Description
Technical Field
The invention relates to the technical field of environmental geotechnical engineering, in particular to a sealant for the bottom of a vertical impervious curtain and a preparation method thereof.
Background
Landfill treatment is a common domestic and industrial solid waste disposal method at home and abroad. The vertical seepage-proofing system is built around the landfill, namely the vertical seepage-proofing curtain is built on the waterproof layer, so that the landfill solid waste can be controlled in the landfill, and meanwhile, the surrounding underground water is prevented from flowing into the landfill.
The problem of leakage at the bottom of the curtain of the existing vertical seepage-proofing system causes solid waste to pollute the downstream environment of the curtain, so that the bottom of the curtain is required to be completely sealed with a waterproof layer by adding a sealant to prevent pollutants from being transported from the bottom end of the curtain. The research has been carried out on preparing the sealant by taking the modified bentonite and the clay as raw materials, but the weight percentage of the modified bentonite is as high as 60-80%, the weight percentage of the clay is only 20-40%, the manufacturing cost of the sealant is higher, and the impermeability of the sealant is required to be further improved. The research also researches that the shielding material is prepared by mixing bentonite, kaolin, attapulgite, sodium carbonate, sodium silicate, sodium dodecyl sulfate, sodium hydroxide, sodium sulfate, magnesium oxide, calcium sulfate, blast furnace slag, fly ash, red mud, mine tailings and phosphogypsum powder with water, the components are more, the cost is higher, and the impermeability is to be further improved.
Disclosure of Invention
Aiming at the problems, the invention provides the sealant for the bottom of the vertical impervious curtain and the preparation method thereof, so that the impermeability of the sealant is improved, and the production cost is reduced.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
a sealant for the bottom of a vertical impervious curtain is prepared by mixing the following raw materials in percentage by weight: 68 to 75 percent of clay, 15 to 20 percent of sodium bentonite, 5 to 10 percent of barite powder, 0.5 to 1.0 percent of sodium silicate pentahydrate, 0.1 to 0.2 percent of carboxymethyl cellulose and 0.8 to 1.0 percent of polyacrylamide.
Compared with the prior art, the sealant for the bottom of the vertical impervious curtain takes clay as a main component, so that the production cost is reduced while good water-resisting performance is kept; the density of the sealant is increased by adding barite powder, so that the sealant is gradually accumulated from the bottom of the curtain upwards, and the sealant is promoted to fill the bottom of the curtain and the cracks of surrounding soil or rock stratum; the fluidity of the sealant is enhanced by adding sodium pentahydrate, and the capability of filling small cracks and gaps with the sealant is improved; by adding polyacrylamide, the sealant absorbs water to expand and block the incompletely filled space, so that tiny channels in rock strata and soil can be effectively reduced; the viscosity of the sealant is increased by adding the carboxymethyl cellulose, so that the sealant is not easy to disperse in water, and the integrity of the sealant is better maintained; by the interaction of the carboxymethyl cellulose, the sodium pentahydrate and the sodium bentonite, the interlayer spacing of the sodium bentonite can be increased, and the dispersibility and stability of the sodium bentonite are further increased; through the synergistic effect of all the components, the water guide channels on two sides of the bottom of the curtain can be blocked, and pollutants in the anti-seepage system are prevented from polluting downstream through the bottom of the curtain. The sealant for the bottom of the vertical impervious curtain provided by the invention improves the impermeability of the sealant and reduces the production cost.
Preferably, the sealant is a slurry, which further comprises water, wherein the weight ratio of water to the solid component is 3.
Preferably, the clay has a permeability coefficient of 10 or less -8 cm/s, plasticity index I P More than or equal to 17. The permeability coefficient and plasticity index of the clay are limited to ensure the performance of the final sealant; meanwhile, the invention can use local clay as a main component, thereby reducing the purchase and transportation cost of materials and further reducing the overall production cost.
Preferably, the permeability coefficient of the sodium bentonite is less than or equal to 10 -9 cm/s。
Preferably, the granularity of the barite powder ranges from 0.05 mm to 0.10mm.
Preferably, the carboxymethyl cellulose has a viscosity of 800 to 1500mPa · s.
The invention also provides a preparation method of the sealant for the bottom of the vertical impervious curtain, which comprises the following steps:
s1, adding clay into water, and stirring for 3-5 min to obtain first mixed slurry;
s2, adding sodium bentonite into the first mixed slurry, and stirring for 2-3 min to obtain a second mixed slurry;
and S3, adding barite powder, sodium silicate pentahydrate, carboxymethyl cellulose and polyacrylamide into the second mixed slurry respectively, and stirring for 3-5 min to obtain the sealant for the bottom of the vertical impervious curtain.
According to the invention, the clay, the sodium bentonite, the barite powder, the sodium silicate pentahydrate, the carboxymethyl cellulose and the polyacrylamide are sequentially added into water, so that the components can fully act to form uniform viscous slurry, and the synergistic effect among the components is fully exerted.
Preferably, in the steps S1 to S3, the rotation speed of the stirring is 1200 to 1500r/min.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
In order to better illustrate the invention, the following examples are given by way of further illustration.
The clay selected in the examples and comparative examples of the present invention was clay in Shanghai county (location) in Shanghai province in Jiangxi, and the permeability coefficient of the clay was 9.3X 10 -8 cm/s, plasticity index I P Is 19; the permeability coefficient of the selected sodium bentonite is 8.5 multiplied by 10 -10 cm/s; the granularity range of the selected barite powder is 0.08mm; the viscosity of the selected carboxymethylcellulose was 1200 mPas.
Example 1
(1) 400g of water is added into a forced stirrer, then 680g of local clay is added, and the mixture is stirred for 3min at the rotating speed of 1200 r/min. Then 200g of sodium bentonite is added, and the stirring is continued for 2min at the current rotating speed. And finally, respectively adding 100g of barite powder, 10g of sodium pentahydrate, 2g of carboxymethyl cellulose and 8g of polyacrylamide, and continuously stirring for 3min at the current rotating speed to obtain the prepared sealant for the bottom of the vertical impervious curtain.
(2) According to the variable water head permeability test of GB/T50123-2019 geotechnical test method Standard, the permeability coefficient of the sealant in the embodiment is 8.9 multiplied by 10 -10 cm/s。
Example 2
(1) 460g of water is added into the forced stirrer, then 750g of local clay is added, and the mixture is stirred for 5min at the rotating speed of 1500r/min. Then 150g of sodium bentonite is added, and the stirring is continued for 3min at the current rotating speed. And finally, respectively adding 84g of barite powder, 5g of sodium pentasilicate, 1g of carboxymethyl cellulose and 10g of polyacrylamide, and continuously stirring for 5min at the current rotating speed to obtain the prepared sealant for the bottom of the vertical impervious curtain.
(2) According to the variable water head permeability test of GB/T50123-2019 geotechnical test method Standard, the permeability coefficient of the sealant in the embodiment is 6.2 multiplied by 10 -10 cm/s。
Example 3
(1) 430g of water was added to the forced stirrer, and then 700g of the local clay was added thereto and stirred at 1300r/min for 4min. Then 180g of sodium bentonite is added, and the stirring is continued for 3min at the current rotating speed. And finally, respectively adding 100g of barite powder, 9g of sodium pentasilicate, 2g of carboxymethyl cellulose and 9g of polyacrylamide, and continuously stirring for 4min at the current rotating speed to obtain the prepared sealant for the bottom of the vertical impervious curtain.
(2) According to the variable water head permeability test of GB/T50123-2019 geotechnical test method Standard, the permeability coefficient of the sealant in the embodiment is 5.4 multiplied by 10 -10 cm/s。
Example 4
(1) 430g of water was added to the forced stirrer, 720g of local clay was added, and the mixture was stirred at 1300r/min for 4min. Then 180g of sodium bentonite is added, and the stirring is continued for 3min at the current rotating speed. And finally, respectively adding 82g of barite powder, 7.5g of sodium pentahydrate, 1.5g of carboxymethyl cellulose and 9g of polyacrylamide, and continuously stirring for 4min at the current rotating speed to obtain the prepared sealant for the bottom of the vertical impervious curtain.
(2) According to the variable water head permeability test of GB/T50123-2019 geotechnical test method Standard, the permeability coefficient of the sealant in the embodiment is 2.3 multiplied by 10 -10 cm/s。
Comparative example 1
(1) In this comparative example, 360g of clay was charged, 540g of sodium bentonite was charged, and the amounts of the remaining components added and the preparation method were the same as in example 4, and a sealant for the bottom of a vertical impervious curtain was prepared.
(2) According to the variable water head permeability test of GB/T50123-2019 geotechnical test method Standard, the permeability coefficient of the sealant in the embodiment is 7.8 multiplied by 10 -9 cm/s。
Comparative example 2
(1) In this comparative example, no carboxymethyl cellulose was added and the amounts of the remaining components and the preparation method were the same as those of example 4, and a sealant for the bottom of the vertical impervious curtain was prepared.
(2) According to the variable water head permeability test of GB/T50123-2019 geotechnical test method Standard, the permeability coefficient of the sealant in the embodiment is 6.2 multiplied by 10 -9 cm/s。
Comparative example 3
(1) In this comparative example, sodium pentasilicate was not added, and the remaining components were added in the same amounts and preparation methods as in example 4, and a sealant for the bottom of the vertical impervious curtain was prepared.
(2) According to the variable water head permeability test of GB/T50123-2019 geotechnical test method Standard, the permeability coefficient of the sealant in the embodiment is 1.3 multiplied by 10 -9 cm/s。
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. The sealant for the bottom of the vertical impervious curtain is characterized by being prepared by mixing the following raw materials in percentage by weight: 68 to 75 percent of clay, 15 to 20 percent of sodium bentonite, 5 to 10 percent of barite powder, 0.5 to 1.0 percent of sodium silicate pentahydrate, 0.1 to 0.2 percent of carboxymethyl cellulose and 0.8 to 1.0 percent of polyacrylamide.
2. The sealant for a vertical impervious curtain bottom according to claim 1, wherein said sealant is a slurry further comprising water, wherein the weight ratio of water to said solid component is 3.
3. The sealant for the bottom of a vertical impervious curtain as claimed in claim 1 or 2, wherein said clay has a permeability coefficient of 10 or less -8 cm/s, plasticity index I P ≥17。
4. The sealant for the bottom of a vertical impervious curtain as claimed in claim 1 or 2, wherein the sodium bentonite has a permeability coefficient of 10 or less -9 cm/s。
5. The sealant for the bottom of the vertical impervious curtain as claimed in claim 1 or 2, wherein the barite powder has a particle size ranging from 0.05 to 0.10mm.
6. The sealant for the bottom of the vertical impervious curtain as claimed in claim 1 or 2, wherein the carboxymethyl cellulose has a viscosity of 800 to 1500 mPa-s.
7. The method for preparing a sealant for a bottom of a vertical impervious curtain as claimed in claim 2, comprising the steps of:
s1, adding clay into water, and stirring for 3-5 min to obtain first mixed slurry;
s2, adding sodium bentonite into the first mixed slurry, and stirring for 2-3 min to obtain a second mixed slurry;
and S3, adding barite powder, sodium silicate pentahydrate, carboxymethyl cellulose and polyacrylamide into the second mixed slurry respectively, and stirring for 3-5 min to obtain the sealant for the bottom of the vertical impervious curtain.
8. The method of preparing a sealant for a bottom of a vertical impervious curtain as claimed in claim 7, wherein the rotation speed of the stirring is 1200 to 1500r/min in steps S1 to S3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211527915.9A CN115872720A (en) | 2022-11-30 | 2022-11-30 | Sealant for bottom of vertical impervious curtain and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211527915.9A CN115872720A (en) | 2022-11-30 | 2022-11-30 | Sealant for bottom of vertical impervious curtain and preparation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN115872720A true CN115872720A (en) | 2023-03-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211527915.9A Pending CN115872720A (en) | 2022-11-30 | 2022-11-30 | Sealant for bottom of vertical impervious curtain and preparation method thereof |
Country Status (1)
| Country | Link |
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| CN (1) | CN115872720A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4983075A (en) * | 1988-05-31 | 1991-01-08 | Sondages Injections Forages Entreprise Bachy | Process for producing an acid-resistant barrier seal in soil, and concrete usable for this purpose |
| CN107555865A (en) * | 2017-08-29 | 2018-01-09 | 湖南宏禹工程集团有限公司 | A kind of anti-seepage reinforcing cream slurry of water resistant stream erosion |
| CN111763040A (en) * | 2020-05-28 | 2020-10-13 | 浙江土工岩土科技有限公司 | Slurry for underground diaphragm wall near river and sea |
| CN112573864A (en) * | 2020-11-20 | 2021-03-30 | 中科鼎实环境工程有限公司 | Clay-based anti-seepage composite material and preparation method thereof |
| CN115057658A (en) * | 2022-06-20 | 2022-09-16 | 上海大学 | Compound high polymer material modified bentonite anti-seepage gasket, and preparation method and application thereof |
-
2022
- 2022-11-30 CN CN202211527915.9A patent/CN115872720A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4983075A (en) * | 1988-05-31 | 1991-01-08 | Sondages Injections Forages Entreprise Bachy | Process for producing an acid-resistant barrier seal in soil, and concrete usable for this purpose |
| CN107555865A (en) * | 2017-08-29 | 2018-01-09 | 湖南宏禹工程集团有限公司 | A kind of anti-seepage reinforcing cream slurry of water resistant stream erosion |
| CN111763040A (en) * | 2020-05-28 | 2020-10-13 | 浙江土工岩土科技有限公司 | Slurry for underground diaphragm wall near river and sea |
| CN112573864A (en) * | 2020-11-20 | 2021-03-30 | 中科鼎实环境工程有限公司 | Clay-based anti-seepage composite material and preparation method thereof |
| CN115057658A (en) * | 2022-06-20 | 2022-09-16 | 上海大学 | Compound high polymer material modified bentonite anti-seepage gasket, and preparation method and application thereof |
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|---|
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