CN115925380A - Phosphogypsum composite sandy soil impermeable material with crack self-healing property and preparation method thereof - Google Patents
Phosphogypsum composite sandy soil impermeable material with crack self-healing property and preparation method thereof Download PDFInfo
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Abstract
The invention provides a phosphogypsum composite sandy soil anti-seepage material with crack self-healing property, which comprises a main material and an auxiliary material, wherein the main material comprises, by weight, 10% of resin modified bentonite, (30-80)% of common sand and the balance phosphogypsum, the auxiliary material is polyacrylamide polymer, and the mixing amount of the auxiliary material is 1% of the weight of the resin modified bentonite; the resin modified bentonite comprises the following components (by weight percent), (70-75)% of sand grains with the grain diameter not more than 1mm, (2-3)% of sodium bentonite, (4-5)% of high molecular polymer, and (15-20)% of water; the high molecular polymer is prepared from methacrylamide, acrylic acid and sodium hydroxide, wherein the mass ratio of the methacrylamide to the acrylic acid is 1 (12-13); the mass ratio of the acrylic acid to the sodium hydroxide is 1 (10.38-0.42). The invention also provides a preparation method of the anti-seepage material. The crack generated by the impermeable material provided by the invention can be self-healed in a large area after meeting water.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of impermeable materials, in particular to a phosphogypsum composite sandy soil impermeable material with crack self-healing property and a preparation method thereof.
[ background of the invention ]
The anti-seepage material is generally applied to scenes such as tailing ponds, refuse landfills, lakes and rivers and the like, and plays a role in isolating inside and outside and preventing seepage. The anti-seepage material is compounded by adopting natural clay and sandy soil, uneven cracks can be generated due to insufficient compaction in the tamping process, and simultaneously, the cracks can be developed due to the excited dry-wet and freeze-thaw cycling effect in the seasonal alternation and the rising or falling process of the underground water level. The natural clay and the sandy soil have poor self-healing performance, and the cracking degree is far greater than the closing degree of the crack in the crack generation and development processes, so that a superior seepage channel is provided for percolate, and the seepage-proofing effect of the material is greatly reduced. Therefore, there is a need to provide an ardealite composite sandy soil impermeable material with crack self-healing property to solve the above problems.
[ summary of the invention ]
The invention aims to solve the technical problem of providing a phosphogypsum composite sandy soil anti-seepage material with crack self-healing property and a preparation method thereof.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the phosphogypsum composite sandy soil seepage-proofing material with the crack self-healing property comprises main materials and auxiliary materials, wherein the main materials comprise, by weight, 10% of resin modified bentonite, (30-80)% of common sand and the balance phosphogypsum, the auxiliary materials are polyacrylamide polymers, and the mixing amount of the polyacrylamide polymers is 1% of the weight of the resin modified bentonite;
the resin modified bentonite comprises the following components (by weight percent), (70-75)% of sand grains with the grain diameter not more than 1mm, (2-3)% of sodium bentonite, (4-5)% of high molecular polymer, and (15-20)% of water; the high molecular polymer is prepared from methacrylamide, acrylic acid and sodium hydroxide, wherein the mass ratio of the methacrylamide to the acrylic acid is 1 (12-13); the mass ratio of the acrylic acid to the sodium hydroxide is 1 (10.38-0.42).
Preferably, the main material comprises, by weight, 10% of resin modified bentonite, 30% of common sand and 50% of phosphogypsum.
Preferably, the common sand is formed by mixing fine sand with the particle size of 20-40mm, medium sand with the particle size of 40-70mm and coarse sand with the particle size of 70-120mm, and the mass ratio of the fine sand to the medium sand to the coarse sand is 2.
Preferably, the water content of all three types of sand is lower than 15% and the grading is good.
Preferably, the relative molecular mass of the polyacrylamide polymer is (5-7). Times.10 7 。
Preferably, the phosphogypsum is washed phosphogypsum with the water content of (12-15)%.
Preferably, the preparation process of the resin modified bentonite comprises the following steps:
s11, placing sand grains and sodium bentonite in a container according to the weight ratio, adding methacrylamide and a proper amount of water, and uniformly stirring to obtain a sand-soil mixture; the grain size of the sand grains is less than or equal to 1mm, the water content is less than 12%, wherein the dry weight content of the part of the grain size between 0.15 mm and 0.7mm is more than 50%; the sodium bentonite contains effective component montmorillonite with dry weight content of more than 70%, the water content of the bentonite is less than 13%, and the swelling index is greater than or equal to 24mL/2g;
s12, weighing acrylic acid and sodium hydroxide in a container according to the mass ratio, dissolving the sodium hydroxide in water, and fully cooling to room temperature to obtain a sodium hydroxide solution; the solid-to-liquid ratio of the sodium hydroxide to the water in the sodium hydroxide water dissolution is 14 (90-100);
s13, placing the acrylic acid container in a water bath environment, gradually adding a sodium hydroxide solution, keeping the temperature change of the container less than 10 ℃ all the time in the adding process, and continuously stirring until the temperature is cooled to room temperature; the heat preservation treatment time is 2-3h;
s14, adding the sodium acrylate monomer solution fully reacted in the step S13 into the sand-soil mixture prepared in the step S11, continuously stirring until the whole soil body is sticky, and continuously stirring for 3-5min to obtain slurry;
and S15, taking out the slurry uniformly stirred in the step S14, and placing the slurry in an environment with a constant temperature of 75 ℃ for heat preservation treatment to obtain the resin modified bentonite.
The invention also provides a preparation method of the ardealite composite sandy soil anti-seepage material with the crack self-healing property, which comprises the following steps:
s1, placing common sand, resin modified bentonite and polyacrylamide polymer in a container, adding water and uniformly mixing; taking phosphogypsum, fully mashing the phosphogypsum, adding the phosphogypsum into a container, and stirring for 10-15min to ensure that the material in the container fully absorbs water and expands to form a mixture;
and S2, sampling the mixture, carrying out compaction experiments to obtain the optimal water content of the mixture, subtracting the initial water content of the mixture from the optimal water content of the mixture, calculating to obtain the residual water required by the system, adding the residual water into a container according to the calculation result, and stirring for 5-10 minutes to obtain the phosphogypsum composite sandy soil anti-seepage material with crack self-healing property.
Compared with the prior art, the ardealite composite sandy soil impermeable material with the crack self-healing property is prepared by compounding the modified bentonite, the ardealite, the common sand and the polyacrylamide polymer, and compared with the traditional impermeable material, the impermeable material can self-heal in a large area after meeting water, and has smaller attenuation influence on the impermeable performance of the material; meanwhile, the phosphogypsum is fully utilized, the solid waste is recycled, and the material cost can be greatly saved.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is an SEM image of the phosphogypsum composite sandy soil impermeable material with fracture self-healing property provided by the invention;
FIG. 2 is a schematic diagram of the state of the mixture under different phosphogypsum contents, wherein the phosphogypsum content in the left graph is 30%, the phosphogypsum content in the middle graph is 50%, and the phosphogypsum content in the right graph is 80%;
FIG. 3 is a graph showing the crack distribution of sample 1 after 1, 7 and 14 days of hardening;
FIG. 4 is a graph showing the crack distribution of sample 3 after 1, 7, and 14 days of hardening;
FIG. 5 is a graph of the crack distribution of sample 6 after 1, 7, and 14 days of hardening;
FIG. 6 is a graph showing the fissure distribution of the sample 3 after hardening for 1, 7 and 14 days and healing after water absorption.
[ detailed description ] embodiments
In order to make the technical solutions in the embodiments of the present invention better understood and make the above objects, features and advantages of the present invention more comprehensible, specific embodiments of the present invention are described below with reference to the accompanying drawings of the present application.
Referring to fig. 1-6, the invention provides an ardealite composite sandy soil impermeable material with crack self-healing property, which comprises a main material and an auxiliary material, wherein the main material comprises, by weight, 10% of resin modified bentonite, (30-80)% of common sand, and the balance ardealite, and the auxiliary material is polyacrylamide polymer, and the mixing amount of the polyacrylamide polymer is 1% of the weight of the resin modified bentonite;
the resin modified bentonite comprises the following components (by weight percent), (70-75)% of sand grains with the grain diameter not more than 1mm, (2-3)% of sodium bentonite, (4-5)% of high molecular polymer, and (15-20)% of water; the high molecular polymer is prepared from methacrylamide, acrylic acid and sodium hydroxide, wherein the mass ratio of the methacrylamide to the acrylic acid is 1 (12-13); the mass ratio of the acrylic acid to the sodium hydroxide is 1 (10.38-0.42).
In the resin modified bentonite, high molecular polymer chains are adsorbed and coated on the surfaces of sodium bentonite particles to form a compact gel structure, and a large number of high molecular polymer molecular chains are combined with the sodium bentonite through a bridge action cluster. Meanwhile, after the polyacrylamide Polymer (PAM) is in contact with water, the side chain C-N is broken, the hydroxyl and the amido on the main chain are hydrophilic groups, the exposed hydroxyl on the surface of the sodium bentonite particles in the system replaces the amino dissociated from the PAM chain and forms carboxyl, and the polymer chain carries a large number of functional groups. A great amount of hydroxyl and carboxyl functional groups in the system can be matched with Si-OH and Si on the surface of common sand particles 4+ 、Ca 2+ 、Mg 2+ And Ca carried by phosphogypsum 2+ 、Mg 2+ The iso-cations are tightly bound by complexation (cross-linking or hibernating) and bridging (adsorption and flocculation). The method ensures that a good three-dimensional network gel structure is formed between the particles and the polymer molecular chains in the composite material, so that the system has good elasticity and strength, a powerful three-dimensional space network structure with a gel structure is formed, and ultrafine particles in the structure are prevented from being carried away by water. The method ensures that the particles in the material do not generate large local tension stress after dehydration and shrinkage during drying, and simultaneously the particles swell again and are tightly combined after water absorption saturation, and the material macroscopically shows that the cracks are greatly closed.
The phosphogypsum plays a role in filling and crosslinking in the system, the specific surface area of phosphogypsum particles is large, the surface is smooth, the fluidity is strong, and after the phosphogypsum is added into the system, the finer phosphogypsum particles fully fill the space between three-dimensional reticular gel structuresThe pores enable the phosphogypsum to be more compact, can be attached to and wrapped on the surfaces of other particles, increases the contact points among the particles, and carries a large amount of Ca 2+ And Mg 2+ 、Fe 3+ The impurity ions can be closely combined with functional groups on a high molecular polymer chain through crosslinking, jellyfishing and flocculation, so that the combination of all components in the system is more compact.
The higher the mixing amount of the phosphogypsum is, the tighter the combination of all components in the system is, the smaller the macroscopic cracks are finally shown, and the better the healing performance is; at the same time, however, the excessive combination of the components in the system can form larger agglomerated particles to form a hardening effect, and the too large combination of the components can increase the difficulty of mixing, so that the mixing is not uniform enough. Referring to fig. 1-3, as the mixing amount of the phosphogypsum increases, the hardening degree of the mixture in the system is more serious, and when the mixing amount of the phosphogypsum reaches 80%, obvious caking particles appear in the system. Therefore, as a preferable scheme, the main material comprises the following components, by weight, 10% of resin modified bentonite, 30% of common sand and 50% of phosphogypsum.
The common sand is formed by mixing fine sand with the particle size of 20-40mm, medium sand with the particle size of 40-70mm and coarse sand with the particle size of 70-120mm, wherein the mass ratio of the fine sand to the medium sand to the coarse sand is 2. The water content of all the three types of sand is lower than 15 percent, and the grading is good. The relative molecular mass of the polyacrylamide polymer is (5-7) multiplied by 10 7 Purchased from the national medicine group. The phosphogypsum is washed phosphogypsum, and the water content of the phosphogypsum is (12-15)%.
The preparation process of the resin modified bentonite comprises the following steps:
s11, placing sand grains and sodium bentonite in a container according to a weight ratio, adding methacrylamide and a proper amount of water, and uniformly stirring to obtain a sand-soil mixture; the grain size of the sand grains is less than or equal to 1mm, the water content is less than 12%, wherein the dry weight content of the part of the grain size between 0.15 mm and 0.7mm is more than 50%; the sodium bentonite contains effective component montmorillonite with dry weight content of more than 70%, the water content of the bentonite is less than 13%, and the swelling index is greater than or equal to 24mL/2g;
s12, weighing acrylic acid and sodium hydroxide in a container according to the mass ratio, dissolving the sodium hydroxide in water, and fully cooling to room temperature to obtain a sodium hydroxide solution; the solid-to-liquid ratio of the sodium hydroxide to the water in the sodium hydroxide dissolution with the water is 14 (90-100);
s13, placing the acrylic acid container in a water bath environment, gradually adding a sodium hydroxide solution, keeping the temperature change of the container less than 10 ℃ all the time in the adding process, and continuously stirring until the temperature is cooled to room temperature; the heat preservation treatment time is 2-3h;
s14, adding the sodium acrylate monomer solution fully reacted in the step S13 into the sand-soil mixture prepared in the step S11, continuously stirring until the whole soil body is sticky, and continuously stirring for 3-5min to obtain slurry;
and S15, taking out the slurry uniformly stirred in the step S14, and placing the slurry in an environment with a constant temperature of 75 ℃ for heat preservation treatment to obtain the resin modified bentonite.
The invention also provides a preparation method of the ardealite composite sandy soil impermeable material with the crack self-healing property, which comprises the following steps:
s1, placing common sand, resin modified bentonite and polyacrylamide polymer in a container, adding water and uniformly mixing; taking phosphogypsum, fully mashing the phosphogypsum, adding the phosphogypsum into a container, and stirring for 10-15min to ensure that the material in the container fully absorbs water and expands to form a mixture;
s2, sampling the mixture and carrying out compaction experiments to obtain the optimal water content of the mixture; and obtaining the initial water content of the mixture by using a drying method, subtracting the initial water content from the optimal water content of the mixture, calculating to obtain the residual water amount required by the system, adding water of the residual water amount into the container according to the calculation result, and stirring for 5-10 minutes to obtain the phosphogypsum composite sandy soil anti-seepage material with crack self-healing property.
The process of compaction experiments was carried out according to geotechnical test method Standard (GBT 50123-2019). For earth materials, the maximum dry density that can be achieved under standard compaction conditions is called the maximum dry density, and the corresponding moisture content is called the optimum moisture content.
Example one
The composite material prepared according to the preparation method provided by the invention is prepared into samples 1-6 according to 90% of compaction degree, and the mixture ratio of each component in the samples 1-6 is shown in table 1.
Table 1 sample composition ratio of each component
In the process of hardening the material, the components in the composite material lose water and shrink to generate uneven tensile stress, so that a gap is generated in a sample. After the crack photo is shot, the crack area of the surface of the sample can be acquired based on an image recognition technology, then the crack area is divided by the surface area of the sample, so that the crack rate of the sample can be obtained, the crack rate is used for representing the cracking severity of the sample, and the higher the crack rate is, the more serious the cracking condition of the sample is.
The samples 1-6 are placed in a ventilation cabinet to be hardened, the fracture picture of the surface of the sample is shot, the fracture rate of the sample in the natural state is calculated by using a matlab program, and the continuous recording is carried out for 14 days. Wherein the images of sample 1 after 1, 7, 14 days of hardening are shown in FIG. 2; the images of sample 3 after 1, 7, 14 days of hardening are shown in FIG. 3; the images of sample 6 after 1, 7, and 14 days of hardening are shown in FIG. 4. The material is placed in the air, cracks are gradually generated due to water evaporation, the surface of the sample is continuously generated with intermittent cracks from the central position to the periphery along with the increase of time, then the cracks gradually change into a few strip-shaped cracks, and the cracks gradually develop and are communicated with each other along with the water evaporation of the surface of the sample to form through-type cracks. Meanwhile, the material shrinks inwards due to dehydration, shrinkage cracks are generated at the joint of the cutting ring and the sample, and the penetration cracks are continuously fused and developed to form crack groups.
Table 2 shows the change in the crack rate of samples 1 to 6 during the hardening process.
TABLE 2 fracture ratio (%) of sample surface
| Sample No. 1 | Sample No. 2 | Sample No. 3 | Sample No. 4 | Sample No. 5 | Sample No. 6 | |
| 1d | 0.59 | 0.34 | 0.23 | 0.09 | 0.06 | 0.04 |
| 2d | 0.76 | 0.52 | 0.43 | 0.35 | 0.24 | 0.17 |
| 3d | 0.92 | 0.88 | 0.53 | 0.44 | 0.29 | 0.21 |
| 4d | 1.26 | 1.17 | 0.94 | 0.65 | 0.59 | 0.34 |
| 5d | 2.34 | 1.43 | 1.27 | 0.84 | 0.54 | 0.45 |
| 6d | 2.84 | 1.77 | 1.42 | 1.19 | 0.87 | 0.53 |
| 7d | 3.23 | 2.04 | 1.77 | 1.41 | 1.12 | 0.77 |
| 8d | 4.55 | 2.82 | 2.54 | 1.67 | 1.34 | 0.93 |
| 9d | 5.56 | 4.15 | 3.33 | 2.05 | 1.5 | 1.2 |
| 10d | 6.53 | 4.81 | 4.05 | 2.45 | 2.05 | 1.52 |
| 11d | 7.05 | 5.71 | 4.91 | 2.86 | 2.17 | 1.64 |
| 12d | 9.02 | 7.38 | 4.96 | 3.03 | 2.79 | 1.88 |
| 13d | 9.53 | 7.62 | 5.26 | 4.19 | 3.26 | 2.2 |
| 14d | 10.32 | 7.86 | 5.33 | 4.37 | 3.49 | 2.69 |
As can be seen from Table 2, the crack rates of samples 1-6 all increased with time, and the crack rates of the surfaces of samples 1-6 increased after 14 days of hardening: 9.73%, 7.52%, 5.10%, 4.28%, 3.43%, 2.65%. It is shown that in the naturally hardened state, the cracking degree of the composite material gradually decreases with the increase of the specific gravity of the phosphogypsum. The crack rates of samples 1-6 increased less and tended to stabilize between 12 and 14 days, indicating that the samples were substantially completely dehydrated and hardened around 12 days.
After the hardened material absorbs water, the surface cracks can heal again. The samples were taken out after hardening for 1, 3, 7, 10 and 14 days, and the crack rate of the sample surface was calculated by taking pictures. And then placing the sample into a constant-temperature water tank, spraying water on the surface of the hardened sample, recording the fracture closure condition of the surface of the sample after 24h, and calculating the fracture rate of the surface of the sample. Fig. 5 shows the images of sample 3 after hardening for 1, 3, and 7 days after water absorption and healing. Comparing this with figure 3, it can be seen that the crevice healed significantly. Table 3 shows the closure of the fissures of the samples 1, 3 and 6 on different days of hardening.
TABLE 3 sample fracture closure
As can be seen from Table 3, the samples obtained better healing effect after re-absorption of water under different days of hardening, and the fracture rate after healing was maintained at a lower level.
The composite material with the phosphogypsum content of 50% is continuously taken as a research object, and the permeability coefficient of the composite material after saturation in tap water solution after cracks are generated on the surface of the sample under different hardening time (1, 7 and 14 days) is researched, wherein the permeability coefficient can further explain that the cracks are greatly closed after the material meets water, and the composite material has a good anti-seepage effect. All the tests adopted the method of controlling the degree of compaction of the composite material to be 90%. Preparing test blocks, allowing the test blocks to stand for 1, 7 and 14 days to generate cracks in a natural state, taking the test blocks hardened for 1, 7 and 14 days out of a ventilation cabinet, putting the test blocks into a variable head test instrument for carrying out variable head permeability test, recording the height change value of the water head after every 24 hours for calculating the permeability coefficient, and finally taking the average value of all data as the permeability coefficient of the test block after the permeability coefficient gradually tends to be stable.
TABLE 4 permeation coefficients of test blocks at different days of hardening
The cracks generated by the hardening of the test blocks from 1 to 14 are closed after meeting water, and the permeability coefficients of the test blocks are maintained at a lower level and are all less than 7.0 multiplied by 10 -9 cm/s；
The cracks on the surface of the material within 14 days of hardening are basically closed after meeting water, so the change range of the permeability coefficient is not large. As can be seen from fig. 3: as the hardening time of the material was longer, the crack rate of the material was larger, and the crack rate after saturation was greatly reduced, as can be seen from table 4: the longer the hardening time of the material is, the higher the permeability coefficient of the material after saturation is, but the larger the increase is, and compared with the unhardened material, the permeability coefficients of the material after 1, 7 and 14 days of hardening are respectively increased by 5.60X 10-10cm/s, 1.64X 10-9cm/s and 2.11X 10-9cm/s. This shows that the material can still be closed greatly when meeting water under the condition of larger crack development, and keeps lower permeability, thus meeting the anti-seepage requirement in the specification.
Compared with the prior art, the phosphogypsum composite sandy soil impermeable material with the crack self-healing property is prepared by compounding the modified bentonite, the phosphogypsum, the common sand and the polyacrylamide polymer, and compared with the traditional impermeable material, the impermeable material can self-heal in a large area after meeting water, and has smaller attenuation influence on the impermeable performance of the material; meanwhile, the phosphogypsum is fully utilized, the solid waste is recycled, and the material cost can be greatly saved.
The embodiments of the present invention have been described in detail, but the present invention is not limited to the described embodiments. Various changes, modifications, substitutions and alterations to these embodiments will occur to those skilled in the art without departing from the spirit and scope of the present invention.
Claims (8)
1. The phosphogypsum composite sandy soil seepage-proofing material with the crack self-healing property is characterized by comprising a main material and an auxiliary material, wherein the main material comprises, by weight, 10% of resin modified bentonite, (30-80)% of common sand and the balance phosphogypsum, the auxiliary material is polyacrylamide polymer, and the mixing amount of the polyacrylamide polymer is 1% of the weight of the resin modified bentonite;
the resin modified bentonite comprises the following components (by weight percent), (70-75)% of sand grains with the grain diameter not more than 1mm, (2-3)% of sodium bentonite, (4-5)% of high molecular polymer, and (15-20)% of water; the high molecular polymer is prepared from methacrylamide, acrylic acid and sodium hydroxide, wherein the mass ratio of the methacrylamide to the acrylic acid is 1 (12-13); the mass ratio of the acrylic acid to the sodium hydroxide is 1 (10.38-0.42).
2. The phosphogypsum-composite sandy soil impermeable material with the crack self-healing performance according to claim 1, wherein the main material comprises, by weight, 10% of resin modified bentonite, 30% of common sand and 50% of phosphogypsum.
3. The phosphogypsum composite sandy soil impermeable material with the crack self-healing property according to claim 1, wherein the common sand is formed by mixing fine sand with the grain size of 20-40mm, medium sand with the grain size of 40-70mm and coarse sand with the grain size of 70-120mm, and the mass ratio of the fine sand to the medium sand to the coarse sand is 2.
4. The phosphogypsum composite sandy soil impermeable material with the crack self-healing property according to claim 3, wherein the water content of all three kinds of sand is lower than 15% and the gradation is good.
5. The phosphogypsum-composite sandy soil impermeable material with crack self-healing performance according to claim 1, wherein the relative molecular mass of the polyacrylamide polymer is (5-7) x 10 7 。
6. The phosphogypsum-compounded sandy soil impermeable material with the crack self-healing property according to claim 1, wherein the phosphogypsum is washed phosphogypsum with water content of (12-15)%.
7. The phosphogypsum-composite sandy soil impermeable material with the crack self-healing property according to claim 1, wherein the preparation process of the resin modified bentonite is as follows:
s11, placing sand grains and sodium bentonite in a container according to a weight ratio, adding methacrylamide and a proper amount of water, and uniformly stirring to obtain a sand-soil mixture; the grain size of the sand grains is less than or equal to 1mm, the water content is less than 12%, wherein the dry weight content of the part of the grain size between 0.15 mm and 0.7mm is more than 50%; the sodium bentonite contains effective component montmorillonite with dry weight content of more than 70%, the water content of the bentonite is less than 13%, and the expansion index is more than or equal to 24mL/2g;
s12, weighing acrylic acid and sodium hydroxide in a container according to the mass ratio, dissolving the sodium hydroxide in water, and fully cooling to room temperature to obtain a sodium hydroxide solution; the solid-to-liquid ratio of the sodium hydroxide to the water in the sodium hydroxide water dissolution is 14 (90-100);
s13, placing the acrylic acid container in a water bath environment, gradually adding a sodium hydroxide solution, keeping the temperature change of the container less than 10 ℃ all the time in the adding process, and continuously stirring until the temperature is cooled to room temperature; the heat preservation treatment time is 2-3h;
s14, adding the sodium acrylate monomer solution fully reacted in the step S13 into the sand-soil mixture prepared in the step S11, continuously stirring until the whole soil body is sticky, and continuously stirring for 3-5min to obtain slurry;
s15, taking out the slurry uniformly stirred in the step S14, and placing the slurry in an environment with a constant temperature of 75 ℃ for heat preservation treatment to obtain the resin modified bentonite.
8. The preparation method of the ardealite composite sandy soil impermeable material with the crack self-healing property according to any one of claims 1 to 7, is characterized by comprising the following steps of:
s1, placing common sand, resin modified bentonite and polyacrylamide polymer in a container, adding water and uniformly mixing; taking phosphogypsum, fully mashing the phosphogypsum, adding the phosphogypsum into a container, and stirring for 10-15min to ensure that the material in the container fully absorbs water and expands to form a mixture;
and S2, sampling the mixture, carrying out compaction experiments to obtain the optimal water content of the mixture, subtracting the initial water content of the mixture from the optimal water content of the mixture, calculating to obtain the residual water required by the system, adding the residual water into a container according to the calculation result, and stirring for 5-10 minutes to obtain the phosphogypsum composite sandy soil anti-seepage material with crack self-healing property.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106000294A (en) * | 2016-07-04 | 2016-10-12 | 三峡大学 | High-expansion low-shrinkage bentonite and preparation method |
| CN108751890A (en) * | 2018-05-03 | 2018-11-06 | 上海胜义环境科技有限公司 | A kind of novel environment friendly impervious material based on ardealite |
| CN110421921A (en) * | 2019-08-09 | 2019-11-08 | 蔡霞 | A kind of impervious bentonite waterproof blanket and its processing technology |
| CN110734239A (en) * | 2019-10-29 | 2020-01-31 | 重庆中防德邦防水技术有限公司 | Rigid waterproof material capable of self-healing in water |
| CN112679139A (en) * | 2021-03-11 | 2021-04-20 | 湖南大学 | Acid and alkali resistant impermeable PMSB material and preparation method thereof |
| CN112679190A (en) * | 2021-01-21 | 2021-04-20 | 广东碧通百年科技有限公司 | Reinforcing waterproof mortar for filling concrete bottom cavity |
-
2022
- 2022-10-27 CN CN202211325551.6A patent/CN115925380A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106000294A (en) * | 2016-07-04 | 2016-10-12 | 三峡大学 | High-expansion low-shrinkage bentonite and preparation method |
| CN108751890A (en) * | 2018-05-03 | 2018-11-06 | 上海胜义环境科技有限公司 | A kind of novel environment friendly impervious material based on ardealite |
| CN110421921A (en) * | 2019-08-09 | 2019-11-08 | 蔡霞 | A kind of impervious bentonite waterproof blanket and its processing technology |
| CN110734239A (en) * | 2019-10-29 | 2020-01-31 | 重庆中防德邦防水技术有限公司 | Rigid waterproof material capable of self-healing in water |
| CN112679190A (en) * | 2021-01-21 | 2021-04-20 | 广东碧通百年科技有限公司 | Reinforcing waterproof mortar for filling concrete bottom cavity |
| CN112679139A (en) * | 2021-03-11 | 2021-04-20 | 湖南大学 | Acid and alkali resistant impermeable PMSB material and preparation method thereof |
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