阅读说明：本技术 一种垂直防污屏障用塑性混凝土 (Plastic concrete for vertical antifouling barrier ) 是由 金国龙 李绍华 徐浩青 李昀 杨博文 车悦 刘红雷 周爱兆 胡梦狄 侯绍雯 孙涛 于 2021-07-06 设计创作，主要内容包括：本发明具体公开一种垂直防污屏障用塑性混凝土,按质量百分比计,包括：水19.7～23.1％、水泥1.9～2.2％、高炉炉渣粉5.8～6.5％、改性膨润土2.3～2.8％、改性玄武岩纤维0.04％和砂66.36～69.26％。采用本发明配合比制作的垂直防污屏障用塑性混凝土满足施工和易性的要求；能够有效减少硫酸盐对塑性混凝土的侵蚀,保证其强度；同时有利于微生物固定化,减少有机污染物的渗透,还能够有效减少氢氧根离子与重金属离子对塑性混凝土的渗透,使其具有良好的抗渗性能；并且以高炉炉渣粉代替部分水泥,减少水泥用量,具有良好的经济性。(The invention specifically discloses plastic concrete for a vertical antifouling barrier, which comprises the following components in percentage by mass: 19.7-23.1% of water, 1.9-2.2% of cement, 5.8-6.5% of blast furnace slag powder, 2.3-2.8% of modified bentonite, 0.04% of modified basalt fiber and 66.36-69.26% of sand. The plastic concrete for the vertical antifouling barrier, which is prepared by adopting the mixing proportion, meets the requirement on construction workability; the corrosion of sulfate to plastic concrete can be effectively reduced, and the strength of the concrete is ensured; meanwhile, the microbial immobilization is facilitated, the permeation of organic pollutants is reduced, and the permeation of hydroxyl ions and heavy metal ions to plastic concrete can be effectively reduced, so that the plastic concrete has good anti-permeability performance; and the blast furnace slag powder is used for replacing part of cement, so that the cement consumption is reduced, and the economic efficiency is good.)

1. The plastic concrete for the vertical antifouling barrier is characterized by comprising the following components in percentage by mass: 19.7-23.1% of water, 1.9-2.2% of cement, 5.8-6.5% of blast furnace slag powder, 2.3-2.8% of modified bentonite, 0.04% of modified basalt fiber and 66.36-69.26% of sand.

2. The plastic concrete for a vertical antifouling barrier according to claim 1, comprising, in mass percent: 19.71 percent of water, 2.22 percent of cement, 6.50 percent of blast furnace slag powder, 2.27 percent of modified bentonite, 0.04 percent of modified basalt fiber and 69.27 percent of sand.

3. The plastic concrete for a vertical antifouling barrier according to claim 1 or 2, wherein the cement is portland cement, and the fineness is 0.08 mm; the blast furnace slag powder is expanded slag powder, and the particle size of the expanded slag powder is 200 meshes; the modified bentonite is modified sodium bentonite, and the particle size of the modified bentonite is 325 meshes.

4. The wet concrete for a vertical antifouling barrier according to claim 3, wherein the modified bentonite is prepared by the following modification method: dissolving acrylic acid in water, slowly dropping sodium hydroxide to neutralize the acidity of the solution, cooling, and adding a thermal initiator sodium persulfate; adding bentonite, stirring and pulping, wherein the content of the bentonite in the soil slurry is 30-50%, and heating the soil slurry to a temperature higher than the pyrolysis temperature of an initiator; and (3) drying, grinding and sieving the soil slurry after the soil slurry fully reacts to obtain the modified bentonite.

5. As claimed inThe plastic concrete for the vertical antifouling barrier according to claim 4, wherein the modified basalt fiber is a modified basalt fiber with the surface added with nano silica particles, and the density of the modified basalt fiber is 1.3g/cm³。

6. The plastic concrete for vertical antifouling barrier according to claim 4 or 5, wherein the modified basalt fiber is prepared by the following modification method: adding the nano silicon dioxide powder into ethanol-water dispersion liquid with the pH value adjusted to 5, performing ultrasonic dispersion, dropwise adding a silane coupling agent while stirring, reacting for 12 hours at 80 ℃, performing centrifugal separation, washing and drying to obtain modified silicon dioxide powder, and finally coating the surface of the basalt fiber with the modified silicon dioxide powder to obtain the modified basalt fiber.

7. The plastic concrete for a vertical antifouling barrier according to claim 6, wherein the mass-to-volume ratio of the nano silica powder to the dispersion is 1: 20; the mass-volume ratio of the silane coupling agent to the dispersion is 1: 50.

8. a plastical concrete for a vertical antifouling barrier according to any one of claims 1, 2, 4, 5 and 7, wherein the sand is a medium sand with a uniform gradation and an average particle size d₅₀＝0.7mm。

9. A method of constructing a vertical anti-fouling barrier, comprising,

excavating a groove with the width of 60-200 cm, excavating the groove to 90-250 cm below a impervious layer, pouring the plastic concrete for the vertical antifouling barrier as claimed in any one of claims 1-9, and connecting the top of the plastic concrete with the HDPE geomembrane after pouring.

10. A method of constructing a vertical anti-fouling barrier according to claim 9, wherein the guide wall is constructed in advance during the casting of the construction.

Technical Field

The invention relates to the technical field of concrete materials, in particular to plastic concrete for a vertical antifouling barrier.

Background

Since the 20 th century and the 80 th century, a large amount of solid wastes are generated by the high-speed development of Chinese industrialization and urbanization, landfill is the inevitable choice for treating the solid wastes currently and in decades in the future in China, and landfill treatment pollution control is an environmental problem which needs to be solved urgently, so that a vertical antifouling barrier is produced at the same time, and the vertical antifouling barrier mainly plays a role in preventing leachate from polluting surrounding soil and underground water. The plastic concrete has the advantages of low strength, low elastic modulus, large strain, small permeability coefficient, good economy and the like, so that the plastic concrete can be applied to the impervious wall of the dam. The plastic concrete is used as a main material of the vertical antifouling barrier and needs to bear certain load and the corrosion of leachate, so that the strength requirement is met; in order to prevent the migration and diffusion of leachate and avoid polluting surrounding soil and underground water, the plastic concrete is required to have good impermeability; at the same time, good workability (mixture density and fluidity) is required for casting such large volumes of plastic concrete in situ. Therefore, the plastic concrete vertical antifouling barrier with excellent performance is manufactured by selecting a proper plastic concrete proportioning material and selecting a reasonable plastic concrete proportioning ratio, and the significance is great.

The density and fluidity of the plastic concrete for the vertical antifouling barrier are the basic performances of the plastic concrete, and the design requirements can be easily met by adjusting the water-cement ratio (the ratio of water to the cementing material; the cementing material refers to cement, blast furnace slag powder and the like), the aggregate concentration and doping amount, the bentonite doping amount and other means. Different from a pure water environment, the plastic concrete for the vertical antifouling barrier emphasizes the chemical compatibility of the plastic concrete and leachate of a polluted site, ensures a certain strength requirement, limits the lateral inflow and outflow of water flow, completely isolates a pollution source from the periphery, and does not deteriorate in a designed service life, so that the strength and the permeability coefficient of the plastic concrete in the water environment are considered, and the influence of the leachate on the strength and the permeability coefficient of the plastic concrete is also considered. The plastic concrete mix proportion before this patent application mainly is applied to in the dam, what considered is that the aspect such as density, mobility, constructability satisfies the design requirement, mainly considers the influence of water environment in the aspect of intensity and osmotic coefficient, but in perpendicular antifouling barrier, plastic concrete is in under the leachate environment, and the kind of leachate has probably to influence plastic concrete's physicochemical property, so need consider the chemical compatibility of leachate and plastic concrete.

Disclosure of Invention

In view of the above, an object of the present invention is to provide a plastic concrete for a vertical antifouling barrier, so that the plastic concrete vertical antifouling barrier of the present invention meets design requirements of density, fluidity, strength, permeability coefficient, etc. in a leachate (sulfate ions, hydroxide ions, heavy metal ions, organic pollutants) environment.

In order to solve the technical problems, the invention provides a plastic concrete for a vertical antifouling barrier, which comprises the following components in percentage by mass: 19.7-23.1% of water, 1.9-2.2% of cement, 5.8-6.5% of blast furnace slag powder, 2.3-2.8% of modified bentonite, 0.04% of modified basalt fiber and 66.36-69.26% of sand.

Preferably, the composite material comprises the following components in percentage by mass: 19.71 percent of water, 2.22 percent of cement, 6.50 percent of blast furnace slag powder, 2.27 percent of modified bentonite, 0.04 percent of modified basalt fiber and 69.27 percent of sand.

Preferably, the cement is portland cement with the fineness of 0.08 mm.

Preferably, the blast furnace slag powder is expanded slag powder, and the particle size of the expanded slag powder is 200 meshes.

Preferably, the modified bentonite is modified sodium bentonite, and the particle size of the modified bentonite is 325 meshes.

Preferably, the modified bentonite is prepared by a modification method as follows: dissolving acrylic acid in water, slowly dropping sodium hydroxide to neutralize the acidity of the solution, cooling, and adding a thermal initiator sodium persulfate; adding bentonite, stirring and pulping, wherein the content of the bentonite in the soil slurry is 30-50%, and heating the soil slurry to a temperature higher than the pyrolysis temperature of an initiator; and (3) drying, grinding and sieving the soil slurry after the soil slurry fully reacts to obtain the modified bentonite.

Preferably, the modified basalt fiber is a modified basalt fiber with the surface added with nano-silica particles, and the density of the modified basalt fiber is 1.3g/cm³。

Preferably, the modified basalt fiber is prepared by the following modification method: adding the nano silicon dioxide powder into ethanol-water dispersion liquid with the pH value adjusted to 5, performing ultrasonic dispersion, dropwise adding a silane coupling agent while stirring, reacting for 12 hours at 80 ℃, performing centrifugal separation, washing and drying to obtain modified silicon dioxide powder, and finally coating the surface of the basalt fiber with the modified silicon dioxide powder to obtain the modified basalt fiber.

Preferably, the mass volume ratio of the nano silicon dioxide powder to the dispersion liquid is 1: 20; the mass-volume ratio of the silane coupling agent to the dispersion is 1: 50.

preferably, the sand is medium sand with uniform gradation and average particle size d₅₀＝0.7mm。

The invention also aims to provide a construction method of the vertical antifouling barrier, which comprises the steps of excavating a groove with the width of 60-200 cm, excavating the groove to 90-250 cm below a waterproof layer, pouring the plastic concrete for the vertical antifouling barrier as claimed in any one of claims 1-9, and connecting the top of the plastic concrete with the HDPE geomembrane after pouring.

Preferably, the guide wall is constructed in advance during construction and pouring.

Compared with the prior art, the invention has the following advantages:

(1) by utilizing the potential activity of the expanded slag powder, the corrosion of sulfate is resisted, the generation of cracks is inhibited, the pore structure of the plastic concrete is improved, the pore diameter is refined and homogenized, and the strength and the impermeability of the plastic concrete in the environment with sulfate ion leachate are improved; and meanwhile, the expanded slag powder replaces cement, so that the cement consumption is reduced, and the cost is saved.

(2) The PH of the modified sodium bentonite after the sodium treatment of the calcium bentonite is utilized, a better environment is provided for cement hydration reaction, and the strength of plastic concrete in a leachate environment is improved; the content of exchangeable cations is increased, a porous active substance with a micropore grid structure and a large specific surface area is formed, the chemical property and the physical adsorption of the porous active substance are improved, and the impermeability of the plastic concrete in the environment with hydroxide ions and heavy metal ion leachate is improved.

(3) The modified basalt fiber with the surface added with the nano-silica particles is utilized to effectively improve the surface roughness of the fiber and increase the effective contact area between organic pollutants and a carrier, and the surface of the modified basalt fiber has the existence of cations, so that the fixation of the organic pollutants is promoted, and the anti-permeability performance of the plastic concrete in the organic pollutant environment is improved; and the modified basalt fiber can be directly degraded in the environment, has no harm, and reduces the pollution to soil and underground water.

(4) The sand is utilized, the grain composition is good, the bleeding and the segregation of the plastic concrete material are avoided, and the plastic concrete material has good constructability; the middle pores can be filled with cement, so that the function of the cement is fully exerted, and the strength of the cement can exert the maximum benefit.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a view showing the construction of a vertical anti-fouling barrier of plastic concrete according to the present invention;

FIG. 2 is a graph showing the change in permeability coefficient according to example 1 of the present invention;

FIG. 3 is a graph showing the change in permeability coefficient according to example 2 of the present invention;

FIG. 4 is a graph of permeability coefficient variation according to example 3 of the present invention;

FIG. 5 is a graph showing the change in permeability coefficient according to example 4 of the present invention.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

The portland cement used in the following examples is not particularly limited as long as it is known to those skilled in the art. The specific gravity of the Portland cement adopted in the following examples is 3.0-3.2, the fineness is 0.08mm, the screen residue is less than or equal to 10 percent, the initial setting time is more than or equal to 45min, the final setting time is less than or equal to 10h, the 28d compressive strength is more than or equal to 42.5MPa, and SO₃The content is less than or equal to 3.5 percent, the MgO content is less than or equal to 5.0 percent, and the ignition loss is less than or equal to 5.0 percent.

Expanded oreSlag powder, sand, bentonite and basalt fiber are all sold in the market. The specific surface area of the expanded slag powder used in the following examples is not less than 0.26m²Per g, alkalinity is more than or equal to 1.87, CaO content is more than or equal to 39 percent, and SiO₂Content of not less than 33% and Al₂O₃The content is more than or equal to 15 percent.

The sands used in the following examples are medium sands of uniform gradation and mean particle size d₅₀0.7mm, coefficient of non-uniformity C_u6, coefficient of curvature C_c1.1, maximum dry density of 1.74g/cm³Minimum dry density of 1.43g/cm³。

The modified bentonite is prepared by the following modification method: dissolving acrylic acid in water, slowly dropping sodium hydroxide to neutralize the acidity of the solution, cooling, and adding a thermal initiator sodium persulfate; adding bentonite (the liquid limit is 100-200%, and the hydration expansion rate is 1.5-3.5 mL/g), stirring and pulping, wherein the content of the bentonite in the soil slurry is 30-50%, and heating the soil slurry to a temperature higher than the pyrolysis temperature of an initiator, specifically 65 ℃; and after the soil slurry fully reacts, drying the soil slurry in a 105 ℃ oven, grinding the soil slurry and sieving the ground soil slurry with a 200-mesh sieve to obtain the modified sodium bentonite, wherein the liquid limit of the modified sodium bentonite is more than or equal to 300 percent, the hydration expansion rate of the modified sodium bentonite is more than or equal to 11mL/g, and the cation exchange capacity of the modified sodium bentonite is more than or equal to 80meq/100 g. All reagents used are commercially available.

The modified basalt fiber is prepared by the following modification method: placing nano silicon dioxide powder with the particle size of 120nm in a vacuum drying oven at 80 ℃ for 12h, then adding the nano silicon dioxide powder into ethanol-water dispersion (1/20g/mL) with the pH value adjusted to 5, ultrasonically dispersing for 1h, then dropwise adding 1/50g/mL gamma-methacryloxypropyltrimethoxysilane while stirring, reacting for 12h at 80 ℃, centrifugally separating, washing with ethanol, repeating for 3 times to remove redundant and self-polymerized gamma-methacryloxypropyltrimethoxysilane, drying in an oven at 60 ℃ to obtain modified silicon dioxide powder, finally coating the surface of basalt fibers (the length is 12mm, the radius is 39 mu m, and the stretching amount is 6%) with the modified silicon dioxide powder, carrying out chemical modification, namely changing the surface structure of the silicon dioxide particles through the chemical reaction between inorganic particle silicon hydroxyl and a modifier, and adopting a coupling agent method to prepare the modified basalt fiber with the density of 1.3g/cm³The stretching amount is less than or equal to 6 percentThe modulus is more than or equal to 42.8GPa, and the tensile strength is more than or equal to 1600 MPa. All reagents used are commercially available.

During actual construction, as shown in fig. 1, a guide wall needs to be arranged first to ensure the position, the trend and the verticality of the plastic concrete vertical antifouling barrier, a grab excavator or a double-wheel mill is used for excavating a groove 200 with the width W of 60-200 cm along the soil layer 100 according to the distribution of the soil layer 100 in a geological survey report, the groove 200 is excavated to a position with the height H of 90-250 cm below an impervious layer 300, then the plastic concrete 400 designed by the invention is poured, and after the pouring is completed, the top of the plastic concrete is connected with the HDPE geomembrane 500.

Example 1

In terms of per cubic plastic concrete, 400kg of water, 45kg of Portland cement, 132kg of expanded slag powder, 46kg of modified sodium bentonite, 0.8kg of modified basalt fiber and 1406kg of sand are prepared into the plastic concrete; the concrete may be prepared by a method known to those skilled in the art, and is not particularly limited.

Performance testing

The test was carried out according to the existing Specification "Standard for soil test methods" (GB/T50123-2019).

The test results are shown in fig. 2. The measured 14d unconfined compressive strength reaches 995kPa, and the 28d unconfined compressive strength reaches 1596 kPa; under the environment of leachate (sulfate ions, hydroxyl ions, heavy metal ions and organic pollutants), the permeability coefficient gradually decreases along with the increase of the age, and from 8 days, the permeability coefficient reaches 10^－7cm/s order of magnitude; the density is about 2030kg/m³The fluidity is about 87 mm.

The plastic concrete vertical antifouling barrier manufactured by adopting the mixing ratio has the advantages that the density and the fluidity meet the technical requirements during pouring, the construction performance is good, the strength and the permeability coefficient meet the technical requirements in the environment of leachate (sulfate ions, hydroxyl ions, heavy metal ions and organic pollutants), and the strength is continuously increased.

Example 2

Preparing 424kg of water, 41kg of Portland cement, 126kg of expanded slag powder, 46kg of modified sodium bentonite, 0.8kg of modified basalt fiber and 1330kg of sand into plastic concrete by per cubic meter of plastic concrete; the concrete may be prepared by a method known to those skilled in the art, and is not particularly limited.

Performance testing

The test was carried out according to the existing Specification "Standard for soil test methods" (GB/T50123-2019).

The test results are shown in fig. 3. Actually measuring that the 14d unconfined compressive strength reaches 833kPa, and the 28d unconfined compressive strength reaches 1380 kPa; under the environment of leachate (sulfate ions, hydroxyl ions, heavy metal ions and organic pollutants), the permeability coefficient gradually decreases along with the increase of the age, and from 7 days, the permeability coefficient reaches 10^－7cm/s order of magnitude; the density is about 1970kg/m³The fluidity was about 93 mm.

The plastic concrete vertical antifouling barrier manufactured by adopting the mixing ratio has the advantages that the density and the fluidity meet the technical requirements during pouring, the construction performance is good, the strength and the permeability coefficient meet the technical requirements in the environment of leachate (sulfate ions, hydroxyl ions, heavy metal ions and organic pollutants), and the strength is continuously increased.

Example 3

462kg of water, 39kg of portland cement, 117kg of expanded slag powder, 56kg of modified sodium bentonite, 0.8kg of modified basalt fiber and 1330kg of sand are prepared into plastic concrete by each cubic mass of plastic concrete; the concrete may be prepared by a method known to those skilled in the art, and is not particularly limited.

Performance testing

The test was carried out according to the existing Specification "Standard for soil test methods" (GB/T50123-2019).

The test results are shown in fig. 4. The measured 14d unconfined compressive strength reaches 419kPa, and the 28d unconfined compressive strength reaches 1129 kPa; under the environment of leachate (sulfate ions, hydroxyl ions, heavy metal ions and organic pollutants), the permeability coefficient gradually decreases along with the increase of the age, and from 15 days, the permeability coefficient reaches 10^－7cm/s order of magnitude; density of about 2000kg/m³Flow ofThe degree is about 98 mm.

The plastic concrete vertical antifouling barrier manufactured by adopting the mixing ratio has the advantages that the density and the fluidity meet the technical requirements during pouring, the construction performance is good, the strength and the permeability coefficient meet the technical requirements in the environment of leachate (sulfate ions, hydroxyl ions, heavy metal ions and organic pollutants), and the strength is continuously increased.

Example 4

According to the weight of each cubic plastic concrete, 430kg of water, 39kg of Portland cement, 117kg of expanded slag powder, 56kg of modified sodium bentonite, 0.8kg of modified basalt fiber and 1355kg of sand are prepared into the plastic concrete; the concrete may be prepared by a method known to those skilled in the art, and is not particularly limited.

Performance testing

The test was carried out according to the existing Specification "Standard for soil test methods" (GB/T50123-2019).

The test results are shown in fig. 5. Actually measuring that the 14d unconfined compressive strength reaches 575kPa, and the 28d unconfined compressive strength reaches 1629 kPa; under the environment of leachate (sulfate ions, hydroxyl ions, heavy metal ions and organic pollutants), the permeability coefficient gradually decreases along with the increase of the age, and reaches 10 from day 12^－7cm/s order of magnitude; density of about 2000kg/m³The fluidity is about 90 mm.

The plastic concrete vertical antifouling barrier manufactured by adopting the mixing ratio has the advantages that the density and the fluidity meet the technical requirements during pouring, the construction performance is good, the strength and the permeability coefficient meet the technical requirements in the environment of leachate (sulfate ions, hydroxyl ions, heavy metal ions and organic pollutants), and the strength is continuously increased.

Comparative example 1

Preparing 400kg of water, 45kg of Portland cement, 132kg of expanded slag powder, 46kg of unmodified bentonite, 0.8kg of modified basalt fiber and 1406kg of sand into plastic concrete by each cubic volume of the plastic concrete; the concrete may be prepared by a method known to those skilled in the art, and is not particularly limited.

Performance testing

The test was carried out according to the existing Specification "Standard for soil test methods" (GB/T50123-2019).

Actually measuring that the 14d unconfined compressive strength reaches 900kPa, and the 28d unconfined compressive strength reaches 1305 kPa; under the environment of leachate (sulfate ions, hydroxide ions, heavy metal ions and organic pollutants), the permeability coefficient is gradually reduced along with the increase of age, but the permeability coefficient cannot reach 10^－7cm/s order of magnitude; density of about 2000kg/m³The fluidity is about 100 mm.

Comparative example 2

In terms of per cubic plastic concrete, 400kg of water, 45kg of Portland cement, 132kg of expanded slag powder, 46kg of modified sodium bentonite, 0.8kg of unmodified basalt fiber and 1406kg of sand are prepared into the plastic concrete; the concrete may be prepared by a method known to those skilled in the art, and is not particularly limited.

Performance testing

The test was carried out according to the existing Specification "Standard for soil test methods" (GB/T50123-2019).

The 14d unconfined compressive strength reaches 956kPa, and the 28d unconfined compressive strength reaches 1397 kPa; under the environment of leachate (sulfate ions, hydroxyl ions, heavy metal ions and organic pollutants), the permeability coefficient is gradually reduced along with the increase of age, and from 10 days, the permeability coefficient reaches 10^－7cm/s order of magnitude; the density is about 2020kg/m³The fluidity is about 90 mm.

Comparative example 3

Preparing 400kg of water, 177kg of Portland cement, 46kg of modified sodium bentonite, 0.8kg of modified basalt fiber and 1406kg of sand into plastic concrete in terms of each cubic mass of plastic concrete; the concrete may be prepared by a method known to those skilled in the art, and is not particularly limited.

Performance testing

The test was carried out according to the existing Specification "Standard for soil test methods" (GB/T50123-2019).

Measured in factThe 14d unconfined compressive strength reaches 1096kPa, and the 28d unconfined compressive strength reaches 1997 kPa; under the environment of leachate (sulfate ions, hydroxide ions, heavy metal ions and organic pollutants), the permeability coefficient is gradually reduced along with the increase of age, but the permeability coefficient cannot reach 10^－7cm/s order of magnitude; density of about 2027kg/m³The fluidity is about 89 mm.

The invention utilizes the potential activity of the expanded slag powder to resist the erosion of sulfate, inhibit the generation of cracks, improve the pore structure of the plastic concrete, refine and homogenize the pore diameter, and improve the strength and the impermeability of the plastic concrete in the environment with sulfate ion leachate; and meanwhile, the expanded slag powder replaces cement, so that the cement consumption is reduced, and the cost is saved.

The modified sodium bentonite after the calcium bentonite is subjected to sodium treatment is utilized, the PH value of the modified sodium bentonite is improved, a better environment is provided for cement hydration reaction, and the strength of plastic concrete in a leachate environment is improved; the content of exchangeable cations is increased, a porous active substance with a micropore grid structure and a large specific surface area is formed, the chemical property and the physical adsorption of the porous active substance are improved, and the impermeability of the plastic concrete in the environment with hydroxide ions and heavy metal ion leachate is improved.

According to the invention, the modified basalt fiber with the nano-silica particles added on the surface is utilized, the surface roughness of the fiber is effectively improved, the effective contact area between an organic pollutant and a carrier is increased, the surface of the modified basalt fiber has the cation, the fixation of the organic pollutant is promoted, and the anti-permeability performance of the plastic concrete in the organic pollutant environment is improved; and the modified basalt fiber can be directly degraded in the environment, has no harm, and reduces the pollution to soil and underground water.

The invention utilizes the sand, the grain composition is good, the bleeding and the segregation of the plastic concrete material are avoided, and the plastic concrete material has good constructability; the middle pores can be filled with cement, so that the function of the cement is fully exerted, and the strength of the cement can exert the maximum benefit.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.