A geosynthetic material for reinforcing a waterproof and drainage integrated structure

Abstract

The application discloses a kind of geosynthetic materials of enhanced waterproof and drainage integrated structure, it is related to building material technical field.The geosynthetic material of the application includes geotextile and filled modified bentonite composition;Modified bentonite composition includes the following weight parts of raw materials: 85-95 weight parts modified bentonite, 2-7.5 weight parts modified cellulose.The preparation method of modified bentonite includes the following steps: S1: with active white clay, CaO is used as raw material dry, component two is washed with hydrochloric acid;S2: component two is obtained component three under the modification of gluconic acid lactone lactone;S4: component three, surface is polymerized to obtain modified bentonite by acrylamide.The geosynthetic material prepared in the application has the advantage of keeping low permeability under repeated load.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building materials, in particular to a geosynthetic material for reinforcing a waterproof and drainage integrated structure. BACKGROUND

[0002] In the process of designing a highway, not only the bearing capacity needs to be calculated when constructing, but also a drainage system needs to be constructed; in general cases, only the discharge of surface water is considered in the construction design, and the problems of pavement cracks, joints and surface voids caused by precipitation are ignored. When precipitation penetrates into the pavement structure, internal water is formed, which is harmful to the pavement. When the rainfall is large and the permeability of the soil of the filled roadbed and the exposed shoulder is not considered during construction, the water penetrating into the pavement structure is retained in the internal part of the pavement structure. This not only causes the pavement paved with asphalt concrete to have cracks, but also causes the pavement to have broken, concave and cratered conditions.

[0003] Geosynthetic material is a new type of geotechnical engineering material, which is made of synthetic fibers, synthetic rubber and other compounds, and glass fibers. It is placed on the surface layer of soil or between layers of soil to protect or strengthen the soil. Geosynthetic material can be divided into geotextile, geomembrane, geocomposite material and geosynthetic special material, etc. It has many functions such as prevention, filtration, drainage, protection, isolation, reinforcement and reinforcement. At the same time, it has the advantages of light weight, easy transportation, high strength, resistance to damage, easy transportation, low price and the like. In recent years, it has been widely used in various geotechnical engineering, especially in water conservancy and engineering. Geosynthetic material needs to have a certain rigidity and not to have large deformation under cyclic traffic load, and also needs to have strong anti-seepage capacity. Most of the geosynthetic drainage materials on the market do not have enough anti-seepage capacity. Therefore, there is an urgent need for a geosynthetic net that can maintain the performance of the anti-seepage system under cyclic traffic load. SUMMARY

[0004] The purpose of the present application is to provide a geosynthetic material for reinforcing a waterproof and drainage integrated structure, which solves the following technical problems:

[0005] The existing geosynthetic net has reduced anti-seepage performance under cyclic traffic load.

[0006] The purpose of the present application can be achieved by the following technical solutions:

[0007] A geosynthetic material for reinforcing a waterproof and drainage integrated structure, the geosynthetic material comprising a geotextile and a filled modified bentonite composition; the modified bentonite composition comprises the following raw materials by weight: 85-95 parts by weight of modified bentonite, 2-7.5 parts by weight of modified cellulose.

[0008] The preparation method of the modified bentonite comprises the following steps:

[0009] S1: uniformly mixing active white clay, CaO and deionized water, drying in an oven at 50-70 DEG C for 3-6h to obtain component one;

[0010] S2: mixing component one and deionized water, adjusting pH to 7-8, filtering, washing, drying and crushing to 200 meshes to obtain component two;

[0011] S3: adding component two and anhydrous ethanol into a reaction kettle, heating to 50-80 DEG C, adding a gluconolactone aqueous solution, keeping warm for 3-6h, filtering, washing, suction filtering and drying to obtain component three;

[0012] S4: adding component three and deionized water into a reaction bottle, uniformly dispersing, heating to 30-40 DEG C, adding acrylamide and potassium persulfate in a nitrogen atmosphere, uniformly dispersing, dropwise adding sodium bisulfite, keeping warm for 18-24h, filtering, washing and drying to obtain the modified bentonite.

[0013] As a further scheme of the present application: in S1, the active white clay, CaO and deionized water are 5:1-3:10-100.

[0014] As a further scheme of the present application: the specific steps of S2 are: mixing 10g of component one and 50-100mL of deionized water, adding 10-20wt% hydrochloric acid aqueous solution to adjust pH to 7-8, filtering, washing, drying and crushing to obtain component two.

[0015] As a further scheme of the present application: the gluconolactone aqueous solution is a 20-30wt% gluconolactone aqueous solution, and the mass ratio of component two, anhydrous ethanol and the gluconolactone aqueous solution in S3 is 5:50-200:5-25.

[0016] As a further scheme of the present application: the mass ratio of component three, deionized water, acrylamide, potassium persulfate and sodium bisulfite in S4 is 1:10-100:3-6:0.1-0.5.

[0017] As a further scheme of the present application: the preparation method of the modified cellulose comprises the following steps: adding maleic anhydride, hydroquinone and N,N-dimethylformamide into a reaction kettle, uniformly dispersing, adding cellulose, heating to 70-80 DEG C, keeping warm for 9-15h, filtering, washing and drying to obtain the modified cellulose.

[0018] As a further scheme of the present application: the addition ratio of maleic anhydride, hydroquinone, N,N-dimethylformamide and cellulose is 2g:0.02-0.05g:10-50mL:2-5g.

[0019] The beneficial effects of the present application are as follows:

[0020] The present application uses activated white clay and CaO as raw materials to obtain alkaline calcium bentonite as component one, and uses the interlayer hydroxyl of component one to react with organic compounds to introduce groups of the organic compounds into the interlayer of component one. First, the component one is modified by using a glucose acid lactone aqueous solution. The glucose acid reacts with the surface hydroxyl of component one to graft more hydroxyl on the surface of component one to obtain component two. Then, acrylamide is used for polymerization in the interlayer of component two to obtain modified bentonite. The modified bentonite prepared in the present application is added in the modified bentonite composition and used as a filler to fill the surface of geosynthetic material. The modified bentonite composition has good hydrophilicity, easy agglomeration, adhesion and easy forming properties. The modified cellulose prepared in the present application is added in the modified bentonite composition to effectively improve the percolation performance of the modified bentonite composition. The modified bentonite composition prepared in the present application not only endows the geosynthetic material with good resistance to cyclic traffic load, but also has strong anti-seepage performance. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0022] Embodiment 1

[0023] The preparation method of the modified cellulose comprises the following steps: 2g of maleic anhydride, 0.05g of hydroquinone and 50mL of N,N-dimethylformamide are added into a reaction kettle and uniformly dispersed, 5g of cellulose is added, the temperature is raised to 80℃, and the temperature is kept for 15h. After filtration, washing and drying, the modified cellulose is obtained.

[0024] Embodiment 2

[0025] The preparation method of the modified bentonite comprises the following steps:

[0026] S1: 5g of activated white clay, 1g of CaO and 10mL of deionized water are uniformly mixed, dried in an oven at 50℃ for 3h, and component one is obtained;

[0027] S2: 10g of component one and 50mL of deionized water are mixed, 10wt% hydrochloric acid aqueous solution is added to adjust the pH to 7, and component two is obtained after filtration, washing, drying and crushing;

[0028] S3: 5 g of component two, 50 g of anhydrous ethanol were added into a reaction kettle, and the temperature was raised to 50°C. Then 5 g of 20 wt% gluconolactone aqueous solution was added, and the mixture was kept at 50°C for 3 h. After filtration, washing, suction filtration and drying, component three was obtained;

[0029] S4: 1 g of component three and 10 mL of deionized water were added into a reaction bottle and uniformly dispersed. The temperature was raised to 30°C under a nitrogen atmosphere. Then 3 g of acrylamide and 0.1 g of potassium persulfate were added and uniformly dispersed. Sodium bisulfite was added dropwise, and the mixture was kept at 30°C for 18 h. After filtration, washing and drying, the modified bentonite was obtained.

[0030] Example 3

[0031] The preparation method of the modified bentonite comprises the following steps:

[0032] S1: 5 g of activated clay, 2 g of CaO and 50 mL of deionized water were uniformly mixed. The mixture was dried in an oven at 60°C for 3 h to obtain component one.

[0033] S2: 10 g of component one and 70 mL of deionized water were mixed. Then 20 wt% hydrochloric acid aqueous solution was added to adjust the pH to 7. After filtration, washing, drying and crushing, component two was obtained.

[0034] S3: 5 g of component two and 100 g of anhydrous ethanol were added into a reaction kettle, and the temperature was raised to 70°C. Then 20 g of 20 wt% gluconolactone aqueous solution was added, and the mixture was kept at 70°C for 3 h. After filtration, washing, suction filtration and drying, component three was obtained.

[0035] S4: 1 g of component three and 70 mL of deionized water were added into a reaction bottle and uniformly dispersed. The temperature was raised to 35°C under a nitrogen atmosphere. Then 5 g of acrylamide and 0.4 g of potassium persulfate were added and uniformly dispersed. Sodium bisulfite was added dropwise, and the mixture was kept at 35°C for 18 h. After filtration, washing and drying, the modified bentonite was obtained.

[0036] Example 4

[0037] The preparation method of the modified bentonite comprises the following steps:

[0038] S1: 5 g of activated clay, 3 g of CaO and 100 mL of deionized water were uniformly mixed. The mixture was dried in an oven at 70°C for 6 h to obtain component one.

[0039] S2: 10 g of component one and 100 mL of deionized water were mixed. Then 20 wt% hydrochloric acid aqueous solution was added to adjust the pH to 7. After filtration, washing, drying and crushing, component two was obtained.

[0040] S3: 5 g of component two and 200 g of anhydrous ethanol were added into a reaction kettle, and the temperature was raised to 80°C. Then 25 g of 20 wt% gluconolactone aqueous solution was added, and the mixture was kept at 80°C for 6 h. After filtration, washing, suction filtration and drying, component three was obtained.

[0041] S4: 1g component three, 100mL deionized water was added into the reaction bottle, uniformly dispersed, heated to 40℃, 6g acrylamide, 0.5g potassium persulfate was added, uniformly dispersed, dropwise added sodium bisulfite, incubated for 24h, filtered, washed, dried, to obtain modified bentonite.

[0042] Example 5

[0043] A geosynthetic material for reinforcing a waterproof and drainage integrated structure, the geosynthetic material comprising a geotextile and a filled modified bentonite composition; the modified bentonite composition comprising raw materials in the following weight parts: 85 parts by weight of the modified bentonite prepared in Example 2, 7.5 parts by weight of the modified cellulose prepared in Example 1.

[0044] Example 6

[0045] A geosynthetic material for reinforcing a waterproof and drainage integrated structure, the geosynthetic material comprising a geotextile and a filled modified bentonite composition; the modified bentonite composition comprising raw materials in the following weight parts: 85 parts by weight of the modified bentonite prepared in Example 3, 7.5 parts by weight of the modified cellulose prepared in Example 1.

[0046] Example 7

[0047] A geosynthetic material for reinforcing a waterproof and drainage integrated structure, the geosynthetic material comprising a geotextile and a filled modified bentonite composition; the modified bentonite composition comprising raw materials in the following weight parts: 85 parts by weight of the modified bentonite prepared in Example 4, 7.5 parts by weight of the modified cellulose prepared in Example 1.

[0048] Comparative Example 1

[0049] The preparation method of the modified bentonite comprises the following steps:

[0050] 5g activated white clay, 1g CaO, 10mL deionized water was mixed uniformly, dried in an oven at 50℃ for 3h, to obtain modified bentonite.

[0051] Comparative Example 2

[0052] The preparation method of the modified bentonite comprises the following steps:

[0053] S1: 5g activated white clay, 1g CaO, 10mL deionized water was mixed uniformly, dried in an oven at 50℃ for 3h, to obtain component one;

[0054] S2: 10g component one, 50mL deionized water was mixed, 10wt% hydrochloric acid aqueous solution was added to adjust pH to 7, filtered, washed, dried, and crushed, to obtain modified bentonite.

[0055] Comparative Example 3

[0056] The preparation method of the modified bentonite includes the following steps:

[0057] S1: 5 g of activated clay, 1 g of CaO, and 10 mL of deionized water were uniformly mixed, dried in an oven at 50°C for 3 h, and component one was obtained;

[0058] S2: 10 g of component one and 50 mL of deionized water were mixed, 10 wt% hydrochloric acid aqueous solution was added to adjust the pH to 7, and then filtered, washed, dried, and crushed to obtain component two;

[0059] S3: 5 g of component two and 50 g of anhydrous ethanol were added to a reaction kettle, heated to 50°C, 5 g of 20 wt% gluconolactone aqueous solution was added, and incubated for 3 h. After filtration, washing, suction filtration, and drying, the modified bentonite was obtained.

[0060] Comparative Example 4

[0061] Comparative Example 4 only replaces the modified bentonite added in Example 5 with an equivalent amount of the modified bentonite prepared in Comparative Example 1, and the remaining components and preparation methods are completely consistent with Example 5.

[0062] Comparative Example 5

[0063] Comparative Example 4 only replaces the modified bentonite added in Example 5 with an equivalent amount of the modified bentonite prepared in Comparative Example 2, and the remaining components and preparation methods are completely consistent with Example 5.

[0064] Comparative Example 6

[0065] Comparative Example 4 only replaces the modified bentonite added in Example 5 with an equivalent amount of the modified bentonite prepared in Comparative Example 3, and the remaining components and preparation methods are completely consistent with Example 5.

[0066] Comparative Example 7

[0067] Comparative Example 4 only replaces the modified cellulose added in Example 5 with an equivalent amount of cellulose, and the remaining components and preparation methods are completely consistent with Example 5.

[0068] Comparative Example 8

[0069] Comparative Example 4 only removes the modified cellulose added in Example 5, and the remaining components and preparation methods are completely consistent with Example 5.

[0070] Performance detection

[0071] Permeability coefficient: according to ASTM D5887 "Standard Test Method for Measuring Index Flux Through Saturated Geosynthetic Clay Liner Sample Using Deformable Wall Permeameter", the effective overburden pressure is adjusted during the detection process, and the pressure is set to 0 kPa, 35 kPa, 100 kPa, 200 kPa and 300 kPa in turn, and the detection results are shown in Table 1;

[0072]

[0073] As shown in Table 1, the geosynthetic material prepared in the application has good anti-seepage performance, and still has good anti-seepage performance under the cyclic traffic load.

[0074] The above describes one embodiment of the application in detail, but the content described is only a preferred embodiment of the application and cannot be considered as limiting the scope of the implementation of the application. Any equivalent changes and improvements made within the scope of the application should still belong to the patent coverage of the application.

Claims

1. A geosynthetic material for enhancing integrated drainage and waterproofing structures, characterized in that, Geosynthetic materials include geotextiles and a modified bentonite composition as filler; the modified bentonite composition comprises the following raw materials in parts by weight: 85-95 parts by weight of modified bentonite and 2-7.5 parts by weight of modified cellulose; the preparation method of the modified bentonite includes the following steps: S1: Mix activated clay, CaO and deionized water evenly, and dry in an oven at 50-70℃ for 3-6 hours to obtain component one; S2: Mix component one and deionized water, adjust the pH to 7-8, filter, wash, dry and pulverize to obtain component two; S3: Add component two and anhydrous ethanol to the reaction vessel, heat to 50-80℃, add gluconolactone aqueous solution, keep warm for 3-6 hours, filter, wash, vacuum filter, and dry to obtain component three; S4: Add component three and deionized water to the reaction flask, disperse evenly, heat to 30-40℃, add acrylamide and potassium persulfate under nitrogen atmosphere, disperse evenly, add sodium bisulfite dropwise, keep warm for 18-24h, filter, wash and dry to obtain modified bentonite.

2. The geosynthetic material for enhancing integrated drainage and waterproofing structures according to claim 1, characterized in that, The ratio of activated clay, CaO, and deionized water in S1 is 5g:1-3g:10-100mL.

3. The geosynthetic material for enhancing integrated drainage and waterproofing structures according to claim 1, characterized in that, The specific steps for S2 are as follows: Mix 10g of component one with 50-100mL of deionized water, add 10-20wt% hydrochloric acid aqueous solution to adjust the pH to 7-8, filter, wash, dry, and pulverize to obtain component two.

4. The geosynthetic material for enhancing integrated drainage and waterproofing structures according to claim 1, characterized in that, The gluconolactone aqueous solution is a 20-30 wt% gluconolactone aqueous solution, and the mass ratio of component two, anhydrous ethanol, and gluconolactone aqueous solution in S3 is 5:50-200:5-25.

5. The geosynthetic material for enhancing integrated drainage and waterproofing structures according to claim 1, characterized in that, The mass ratio of component three in S4, deionized water, acrylamide, and potassium persulfate is 1:10-100:3-6:0.1-0.

5.

6. The geosynthetic material for enhancing integrated drainage and waterproofing structures according to claim 1, characterized in that, The method for preparing the modified cellulose includes the following steps: maleic anhydride, hydroquinone, and N,N-dimethylformamide are added to a reaction vessel and dispersed evenly; cellulose is added; the temperature is raised to 70-80℃ and kept at that temperature for 9-15 hours; the mixture is then filtered, washed, and dried to obtain the modified fiber.

7. The geosynthetic material for enhancing integrated drainage and waterproofing structures according to claim 6, characterized in that, The addition ratio of maleic anhydride, hydroquinone, N,N-dimethylformamide, and cellulose is 2g:0.02-0.05g:10-50mL:2-5g.

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