Plastic concrete suitable for soft soil foundation anti-seepage wall and preparation method thereof

Abstract

This invention discloses a plastic concrete suitable for seepage-proof walls on soft soil foundations and its preparation method. By weight, it comprises: 210-250 parts of strength component, 80-90 parts of deformation component, 0.1-0.2 parts of thickening component, 1900-1950 parts of skeleton component, and 211-251.2 parts of liquid component. The strength component includes cement, fly ash microspheres, and metakaolin; the deformation component includes bentonite, sepiolite powder, and attapulgite; the thickening component includes cellulose and amylase; the skeleton component includes sand and stone; and the liquid component includes mixing water and a water-reducing agent. This invention, through the mixing of each strength component, forms hollow spheres and a network structure filling the voids in the cement particles. Combined with the multiple network structure formed by the deformation component, it can prepare plastic concrete particles that are firmly embedded and stable while possessing good deformation capacity. This reduces the elastic modulus while ensuring the compressive strength of the concrete, thereby lowering the elasticity / strength ratio.

Description

Technical Field

[0001] The present invention relates to the technical field of cement-based composite materials, and more specifically, to a plastic concrete suitable for a soft soil foundation anti-seepage wall and a preparation method thereof. Background Art

[0002] Plastic concrete is a high-fluidity concrete with a low cement content and a large amount of bentonite and clay. It has the characteristics of high fluidity, low compressive strength (28-day compressive strength <5MPa), low static elastic modulus (<2000MPa), large deformation (1%-5%), etc. It is a flexible cement-based material that can adapt well to softer foundations, reduce stress in the wall, and thus avoid cracking of the wall due to large deformation. At the same time, it has good impermeability and is widely used in anti-seepage walls on soft soil foundations.

[0003] In the prior art, patent CN107640941A discloses a kind of propylene latex toughened plastic concrete with good deformation adaptability and preparation method, with 28-day compressive strength of 2MPa-4MPa, 28-day static elastic modulus of 485MPa-898MPa, and 28-day elasticity / strength ratio of 214-250, which is much less than the requirement that the elasticity / strength ratio of plastic concrete is less than 500. Chinese patent CN109912281A discloses an anti-seepage plastic concrete for anti-seepage wall and preparation method, with 28-day compressive strength of 8MPa-10MPa, 28d static elastic modulus of 1000MPa-2000MPa, and 28-day elasticity / strength ratio of 200-300.

[0004] It can be seen from the currently disclosed patent technologies that the 28d compressive strength of plastic concrete is less than 10MPa, the 28d static elastic modulus is less than 2000MPa, and the 28d elasticity / strength ratio is less than 300. Therefore, for anti-seepage walls that require high bearing capacity and deformation and cracking resistance, the current plastic concrete preparation technology has problems such as insufficient compressive strength, insufficient elastic modulus, and insufficient elasticity / strength ratio.

[0005] In order to solve the above problems, it is necessary to provide a plastic concrete suitable for soft soil foundation anti-seepage wall and a preparation method thereof, which can reduce its elastic modulus and elasticity / strength ratio while ensuring the compressive strength of the plastic concrete. Summary of the invention

[0006] The purpose of the present invention is to provide a plastic concrete suitable for anti-seepage walls of soft soil foundations and a preparation method thereof. The strength component is formed by mixing cement, fly ash microbeads, metakaolin and other components, and hollow spheres and mesh structures are respectively formed in the gaps of cement particles. Combined with the multiple mesh structures formed by bentonite, sepiolite powder and attapulgite in the deformation component, plastic concrete particles with good deformation ability while being embedded stably can be formed, and the elastic modulus is reduced while ensuring the compressive strength of the concrete, thereby reducing the elastic-strength ratio.

[0007] In order to achieve these purposes and other advantages according to the present invention, a plastic concrete suitable for an anti-seepage wall of a soft soil foundation is provided, which comprises, by weight:

[0008] Strength component 210-250 parts, deformation component 80-90 parts, thickening component 0.1-0.2 parts, skeleton component 1900-1950 parts, liquid component 211-251.2 parts;

[0009] Among them, the strength component includes cement, fly ash microspheres, and kaolin; the deformation component includes bentonite, sepiolite powder, and attapulgite; the thickening component includes cellulose and amylase; the skeleton component includes sand and stone; and the liquid component includes mixing water and a water reducer.

[0010] Preferably, in the plastic concrete suitable for anti-seepage walls of soft soil foundations, the mass ratio of cement, fly ash microbeads and metakaolin in the strength components is 16:3:1.

[0011] Preferably, in the plastic concrete suitable for anti-seepage walls of soft soil foundations, the mass ratio of bentonite, sepiolite powder and attapulgite in the deformation components is 18:1:1.

[0012] Preferably, in the plastic concrete suitable for anti-seepage walls of soft soil foundations, the mass ratio of cellulose to amylase in the thickening component is 7:3.

[0013] Preferably, in the plastic concrete suitable for anti-seepage walls of soft soil foundations, the mass proportion of sand in the skeleton components is 47-53%.

[0014] Preferably, the plastic concrete suitable for anti-seepage walls of soft soil foundations, the liquid components include 210-250 parts of mixing water and 1-1.2 parts of a water reducing agent.

[0015] The present invention also provides a method for preparing plastic concrete suitable for an anti-seepage wall of a soft soil foundation, comprising:

[0016] S1. Weigh the deformed components, add them into a water tank filled with water, mix them thoroughly and stir them evenly to obtain a mixture A;

[0017] S2, weighing the skeleton component and the strength component, mixing and stirring them to obtain a mixture B;

[0018] S3, weighing the thickening component and the liquid component, mixing and stirring them to obtain a mixture C;

[0019] S4. After adding the mixture C to the mixture B and stirring evenly, add the mixture A and continue stirring evenly to obtain plastic concrete suitable for high-bearing capacity flexible anti-seepage walls on soft soil foundations.

[0020] Preferably, in the method for preparing the plastic concrete suitable for the anti-seepage wall of the soft soil foundation, in S1, the deformed component is first subjected to an acidification modification treatment before being added to the water tank, and the treatment method includes:

[0021] S11, placing a mixture of 72-81 parts of bentonite, 4-4.5 parts of sepiolite powder and 4-4.5 parts of attapulgite into an ultrasonic dispersing device filled with 8%-10% hydrochloric acid solution, starting the ultrasonic dispersing device, dispersing and acidifying the mixture at 40° C.-50° C., and acidifying for 12 hours, washing the mixture to neutrality and drying it to obtain a purified deformation component;

[0022] S12, heating the purified deformation component to 150°C-200°C, adding 3-5 parts of epoxy-modified silicone oil, stirring evenly, cooling to room temperature and drying, thereby obtaining a modified deformation component.

[0023] The present invention has at least the following beneficial effects:

[0024] 1. The present invention forms a strength component by mixing cement, fly ash microbeads, metakaolin and other components, and forms hollow spheres and mesh structures in the gaps of cement particles, respectively. Combined with the multiple mesh structures formed by bentonite, sepiolite powder and attapulgite in the deformation component, plastic concrete particles with good deformation ability while being embedded stably can be formed. While ensuring the compressive strength of concrete, the elastic modulus is reduced, thereby reducing the elastic-strength ratio and greatly enhancing the flexibility of concrete. The prepared concrete meets the requirements of compressive strength>10MPa, elastic modulus<2000MPa, and elastic-strength ratio<200, and can be better applied to the construction of anti-seepage walls on soft soil foundations to avoid problems such as concrete deformation and cracking.

[0025] 2. The preparation method of the present invention can utilize the impact of the skeleton component to break up the strength component and improve the mixing uniformity by premixing the skeleton component with the strength component; premixing the thickening component with the liquid component can give full play to the effect of a small amount of thickening component and avoid local uneven mixing; after the above components are mixed and stirred evenly, the deformation component that has been dispersed, acidified and modified is added, which can effectively avoid the problem that the deformation component is easy to agglomerate after encountering a small amount of water, reduce the effect of the deformation component in the plastic concrete, and cause the homogeneity to deteriorate, further improve the mutual promotion of the components in the plastic concrete, make the components evenly mixed and fully combined, so as to prepare plastic concrete with better homogeneity and bonding stability.

[0026] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The present invention is a schematic flow chart of a method for preparing plastic concrete suitable for an anti-seepage wall of a soft soil foundation according to an embodiment of the present invention. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0029] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] In order to better adapt to the construction of high-bearing capacity flexible anti-seepage wall on soft soil foundation, the purpose of the present invention is to provide a plastic concrete with compressive strength>10MPa, elastic modulus<2000MPa, and elasticity / strength ratio<200.

[0031] like Figure 1 As shown, the present invention provides a plastic concrete suitable for a soft soil foundation anti-seepage wall, which comprises, by weight:

[0032] Strength component 210-250 parts, deformation component 80-90 parts, thickening component 0.1-0.2 parts, skeleton component 1900-1950 parts, liquid component 211-251.2 parts;

[0033] Among them, the strength component includes cement, fly ash beads, and kaolin, and their mass ratio is 16:3:1; the deformation component includes bentonite, sepiolite powder, and attapulgite, and their mass ratio is 18:1:1; the thickening component includes cellulose and amylase, and their mass ratio is 7:3; the skeleton component includes sand and stone, and the mass proportion of sand is 47-53%; the liquid component includes 210-250 parts of mixing water and 1-1.2 parts of water reducer.

[0034] Specifically, in the strength component, the cement is silicate cement with a strength not less than 42.5; the particle size of the fly ash microspheres is 1 μm-4 μm, the water demand ratio is ≤90%, the 28d activity index is ≥110%, and the static pressure strength is 70MPa-140MPa; the specific surface area of ​​the metakaolin is ≥25000m 2 / kg. Fly ash microspheres are a kind of potential hydraulic hollow spheres. On the one hand, because the microsphere particles are smaller than cement, they can be added to concrete to fill the gaps between cement particles, so that free water can be discharged and the water consumption can be reduced. At the same time, fly ash microspheres can also undergo secondary hydration reaction with calcium hydroxide, a cement hydration product, to improve the mechanical strength of plastic concrete. On the other hand, when plastic concrete is subjected to compressive loads, the spatial structural characteristics of fly ash microspheres are also utilized. Fly ash microspheres, as hollow spheres with a certain static pressure strength, can be filled in the mesh structure formed by cement and kaolin. While ensuring the compressive strength, they provide stress relief for elastic deformation of plastic concrete, increase the compressive elastic deformation of plastic concrete, thereby reducing the compressive elastic modulus and further reducing the elastic / strength ratio of plastic concrete. As a metastable amorphous silicon-aluminum compound, kaolin can react with calcium hydroxide, a cement hydration product, to form an aluminosilicate network structure composed mainly of ionic and covalent bonds and supplemented by van der Waals bonds. When subjected to compressive loads, the network structure can deform more than the layered structure and absorb more deformation energy, thereby improving the mechanical strength and compressive elastic deformation of plastic concrete and reducing the compressive elastic modulus.

[0035] In the deformation component, the bentonite has a residue of ≤10% after passing through a 325-mesh sieve. The bentonite has a layered structure and carries a negative charge, has an adsorption effect on cations, and forms a network structure when it meets water to provide elastic deformation; the sepiolite powder has a particle size of 5μm-10μm and a layered chain structure, which can be inserted into the double-layer network structure of the bentonite to form a finer fiber network structure, which plays a supplementary and reinforcing role for the double-layer network structure of the bentonite; the attapulgite has a particle size of 5μm-15μm and has a microfibrous appearance. It can be inserted into the double-layer network structure of the bentonite to form a chaotic network, which plays a role in suppressing the floating of lighter materials and improving the overall homogeneity of the plastic concrete.

[0036] Among the thickening components, the cellulose has a viscosity of 38,000-51,500 mPa.s, which is used to improve the cohesiveness and water retention of plastic concrete, and works together with microfibrous attapulgite to inhibit the floating of low-density fly ash microbeads, bentonite and other materials, thereby improving the homogeneity of plastic concrete; the amylase has a viscosity of 400-1200 mPa.s, and works together with cellulose in plastic concrete mixtures to provide higher thickening, stronger structural properties, and anti-stratification properties.

[0037] In the skeleton component, the sand is river sand, machine-made sand or mixed sand, or a mixture of the two or more thereof, with a particle size of ≤4.75 mm and a fineness modulus of 2.6-2.9.

[0038] In the liquid component, the water reducing agent has a water reducing rate of ≥25%.

[0039] Embodiment 1:

[0040] A plastic concrete suitable for anti-seepage walls of soft soil foundations, comprising, by weight:

[0041] 230 parts of strength component, 85 parts of deformation component, 0.15 parts of thickening component, 1922 parts of skeleton component, and 231.1 parts of liquid component;

[0042] Among them, the strength component includes 184 parts of cement, 34.5 parts of fly ash beads, and 11.5 parts of kaolin; the deformation component includes 76.5 parts of bentonite, 4.25 parts of sepiolite powder, and 4.25 parts of attapulgite; the thickening component includes 0.105 parts of cellulose and 0.045 parts of amylase; the skeleton component includes 961 parts of sand and 961 parts of stone; the liquid component includes 230 parts of mixing water and 1.1 parts of water reducer.

[0043] The plastic concrete suitable for the anti-seepage wall of soft soil foundation is prepared by the following method:

[0044] S1, weighing the deformed component, adding it into a water tank filled with water, mixing it thoroughly and stirring it evenly to obtain a mixture A, wherein the mass ratio of the deformed component to the water in the water tank is 2:1;

[0045] S2, weighing the skeleton component and the strength component, mixing and stirring them to obtain a mixture B;

[0046] S3, weighing the thickening component and the liquid component, mixing and stirring them to obtain a mixture C;

[0047] S4. After adding the mixture C to the mixture B and stirring evenly, add the mixture A and continue stirring evenly to obtain plastic concrete suitable for high-bearing capacity flexible anti-seepage walls on soft soil foundations.

[0048] The properties and indicators of the raw materials of each component of the plastic concrete suitable for the anti-seepage wall of the soft soil foundation are as follows:

[0049] The strength component is a mixture of cement, fly ash microspheres and kaolin, wherein the cement is silicate cement with a strength grade of 42.5; the fly ash microspheres are finished fly ash microspheres with a particle size of 1 μm, a water demand ratio of 90%, a 28d activity index of 110% and a static pressure strength of 70 MPa; and the kaolin is finished kaolin with a specific surface area of ​​25,000 m2 / kg.

[0050] The deformation component is a mixture of bentonite, sepiolite powder and attapulgite after acidification and modification, which is prepared by the following method:

[0051] S11, weighing bentonite, sepiolite powder and attapulgite, placing them in an ultrasonic dispersion device filled with 8% hydrochloric acid solution, starting the ultrasonic dispersion device, dispersing and acidifying the mixture at 40° C., and acidifying for 12 hours, washing the mixture to neutrality and drying it to obtain a purified deformation component;

[0052] S12, heating the purified deformation component to 150° C., adding 5 parts of epoxy-modified silicone oil, stirring evenly, cooling to room temperature and drying, thereby obtaining a modified deformation component.

[0053] Among them, the bentonite is sodium-based modified bentonite, and 10% of it passes through a 325-mesh sieve; the sepiolite powder is finished sepiolite powder with a particle size of 5 μm; the attapulgite is finished attapulgite powder with a particle size of 5 μm; the ultrasonic dispersion device is an ultrasonic disperser, whose ultrasonic power is 3000W, the operating frequency is 19.5-20.5KHz, and the ultrasonic power ratio is 1%-99% (300-3000W adjustable).

[0054] The thickening component is a mixture of cellulose and amylase, wherein the cellulose is hydroxyethyl methyl cellulose, the hydroxyl groups and ether bonds on the molecular chain of which can combine with free water through hydrogen bonds, and can further improve the cohesiveness and water retention of plastic concrete; and the amylase is guar gum amylase.

[0055] The skeleton component is a mixture of sand and stone, wherein the sand is river sand with a particle size of 4.75 mm and a fineness modulus of 2.6; the stone is limestone crushed stone with a continuous grade of 5 mm to 20 mm.

[0056] The liquid component is a mixture of a water reducing agent and mixing water, wherein the water reducing agent is a polycarboxylic acid-based high-performance water reducing agent, and the mixing water is tap water.

[0057] Embodiment 2:

[0058] A plastic concrete suitable for anti-seepage walls of soft soil foundations, comprising, by weight:

[0059] 250 parts of strength component, 90 parts of deformation component, 0.17 parts of thickening component, 1917 parts of skeleton component, and 251 parts of liquid component;

[0060] Among them, the strength component includes 200 parts of cement, 37.5 parts of fly ash beads, and 12.5 parts of kaolin; the deformation component includes 81 parts of bentonite, 4.5 parts of sepiolite powder, and 4.5 parts of attapulgite; the thickening component includes 0.119 parts of cellulose and 0.051 parts of amylase; the skeleton component includes 959 parts of sand and 958 parts of stone; the liquid component includes 250 parts of mixing water and 1 part of water reducer.

[0061] The preparation method of the plastic concrete suitable for the anti-seepage wall of the soft soil foundation, the performance and index of each component raw material are the same as those in Example 1.

[0062] Comparative Example 1:

[0063] A plastic concrete, comprising, by weight:

[0064] 270 parts of strength component, 100 parts of deformation component, 0.19 parts of thickening component, 1827 parts of skeleton component, and 270.9 parts of liquid component;

[0065] Among them, the strength component includes 216 parts of cement, 40.5 parts of fly ash beads, and 13.5 parts of kaolin; the deformation component includes 90 parts of bentonite, 5 parts of sepiolite powder, and 5 parts of attapulgite; the thickening component includes 0.133 parts of cellulose and 0.057 parts of amylase; the skeleton component includes 914 parts of sand and 913 parts of stone; the liquid component includes 270 parts of mixing water and 0.9 parts of water reducer.

[0066] The preparation method of the above-mentioned plastic concrete, the performance and indexes of the raw materials of each component are the same as those in Example 1.

[0067] Comparative Example 2:

[0068] A plastic concrete, comprising, by weight:

[0069] 200 parts of strength component, 70 parts of deformation component, 0.13 parts of thickening component, 1992 parts of skeleton component, and 201 parts of liquid component;

[0070] Among them, the strength component includes 160 parts of cement, 30 parts of fly ash beads, and 10 parts of kaolin; the deformation component includes 63 parts of bentonite, 3.5 parts of sepiolite powder, and 3.5 parts of attapulgite; the thickening component includes 0.091 parts of cellulose and 0.039 parts of amylase; the skeleton component includes 996 parts of sand and 996 parts of stone; the liquid component includes 200 parts of mixing water and 1 part of water reducer.

[0071] The preparation method of the above-mentioned plastic concrete, the performance and indexes of the raw materials of each component are the same as those in Example 1.

[0072] Comparative Example 3:

[0073] A plastic concrete, comprising, by weight:

[0074] 230 parts of strength component, 85 parts of deformation component, 0.15 parts of thickening component, 1922 parts of skeleton component, and 231.1 parts of liquid component;

[0075] Among them, the strength component includes 184 parts of cement, 34.5 parts of fly ash beads, and 11.5 parts of kaolin; the deformation component includes 76.5 parts of bentonite, 4.25 parts of sepiolite powder, and 4.25 parts of attapulgite; the thickening component includes 0.105 parts of cellulose and 0.045 parts of amylase; the skeleton component includes 961 parts of sand and 961 parts of stone; the liquid component includes 230 parts of mixing water and 1.1 parts of water reducer.

[0076] The plastic concrete is prepared by the following method:

[0077] The deformation component, the skeleton component, the strength component and the thickening component are weighed, and added into the weighed liquid component respectively, and the mixture is mixed and stirred evenly to obtain the plastic concrete.

[0078] The performance and indexes of the raw materials of each component of the above-mentioned plastic concrete are the same as those in Example 1.

[0079] Comparative Example 4:

[0080] A plastic concrete, comprising, by weight:

[0081] 230 parts of strength component, 85 parts of deformation component, 0.15 parts of thickening component, 1922 parts of skeleton component, and 231.1 parts of liquid component;

[0082] Among them, the strength component includes 184 parts of cement, 34.5 parts of fly ash beads, and 11.5 parts of kaolin; the deformation component includes 76.5 parts of bentonite, 4.25 parts of sepiolite powder, and 4.25 parts of attapulgite; the thickening component includes 0.105 parts of cellulose and 0.045 parts of amylase; the skeleton component includes 961 parts of sand and 961 parts of stone; the liquid component includes 230 parts of mixing water and 1.1 parts of water reducer.

[0083] The preparation method of the above-mentioned plastic concrete, the properties and indicators of the raw materials such as the strength component, the thickening component, the skeleton component and the liquid component are the same as those in Example 1;

[0084] The deformation component selected in the above plastic concrete is a direct mixture of a certain amount of bentonite (76.5 parts), sepiolite powder (4.25 parts), and attapulgite (4.25 parts).

[0085] Experimental example: Concrete performance test

[0086] The properties of the concrete prepared in Examples 1-2 and Comparative Examples 1-4 were tested according to the following standards and their elasticity / strength ratios were calculated. The results are shown in Table 1. The testing basis is as follows:

[0087] 28d compressive strength: tested according to GB / T50107-2010 "Concrete Strength Test and Assessment Standard";

[0088] 28d elastic modulus: tested according to standard GB / T50081-2019 "Standard Test Method for Mechanical Properties of Ordinary Concrete".

[0089] Table 1 Concrete performance test and calculation results in Examples 1-2 and Comparative Examples 1-4

[0090]

[0091] According to the test results of Table 1, the 28d compressive strength of the plastic concrete suitable for the soft soil foundation anti-seepage wall prepared in Examples 1-2 is greater than 10MPa and the elastic modulus is less than 2000MPa, and the elastic / strength ratio is less than 200, indicating that the concrete prepared by the technical solution of the present invention effectively reduces the elastic modulus while ensuring the compressive strength of the concrete, thereby reducing the elastic / strength ratio, and effectively improving the crack resistance of the concrete, which can be better applied to the construction of high-bearing capacity flexible anti-seepage walls on soft soil foundations, and avoid problems such as concrete deformation and cracking. The above technical solution is mainly optimized and improved from two aspects: the concrete component ratio and the preparation method, so that the physical filling and chemical reaction effects of each component in the concrete preparation are improved, thereby improving the overall performance of the concrete, so that its compressive strength and elastic modulus meet the engineering requirements.

[0092] Specifically, in terms of the proportion of concrete components, a comprehensive comparison of the data of Examples 1-2 and Comparative Examples 1-2 shows that, on the basis of using the same raw materials and preparation methods, the amounts of the strength component and the deformation component in Comparative Example 1 exceed the limits specified in this application, while the amount of the skeleton component is lower than the limits specified in this application (i.e., the relative contents of the strength component and the deformation component are higher, and the relative content of the skeleton component is lower). Although the compressive strength of the prepared concrete is slightly higher than that of the concrete of Example 2, the elastic modulus is significantly greater than that of the concrete of Example 2 and does not meet the required limit (less than 2000 MPa), so the concrete elastic-strength ratio of Comparative Example 1 is significantly higher. The amount of strength component and deformation component in comparative example 2 is lower than the limit value specified in this application, and the amount of skeleton component is higher than the limit value specified in this application (i.e., the relative content of strength component and deformation component is low, and the relative content of skeleton component is high). The obtained concrete compressive strength is significantly lower than that of the concrete in embodiment 1 and does not meet the strength requirement (greater than 10MPa), and the elastic modulus is significantly higher than that of the concrete in embodiment 1 and exceeds the required limit value (less than 2000MPa). Therefore, the concrete elastic strength ratio of comparative example 2 is significantly higher than that of embodiment 1 and does not meet the required limit value (less than 200). It can be seen from this that when the dosage ratio of strength component, deformation component and skeleton component is unreasonable (not meeting the range set by the present invention), the obtained concrete performance decreases, especially the anti-cracking performance decreases, and the high-quality construction of the anti-seepage wall of the soft soil foundation cannot be met.

[0093] In terms of the concrete preparation method, Example 1 and Comparative Examples 3-4 all use the same concrete component ratio and raw materials:

[0094] ① Through the comparison of test data, it can be seen that although exactly the same component ratio and raw materials are used, under different preparation methods, the compressive strength of the concrete prepared in Comparative Example 3 is significantly lower than that of the concrete prepared in Example 3 and does not meet the required concrete standard (compressive strength>10MPa), and the elastic modulus is significantly higher than that of the concrete prepared in Example 3 and does not meet the required standard (elastic modulus<2000MPa), so the elasticity / strength ratio is also significantly higher than that of the concrete prepared in Example 3 and does not meet the required concrete standard (elasticity / strength ratio<200).

[0095] Among them, Comparative Example 3 adopts a different concrete preparation method, that is, the deformation component is directly mixed with the skeleton component, the strength component, the thickening component, and the liquid component to prepare the concrete. Since the water content in the liquid component is fixed, the addition of a large amount of other components and the reaction in the water easily cause the deformation component to agglomerate when it encounters insufficient water, reducing the role of the deformation component in the plastic concrete, resulting in poor homogeneity; in addition, direct mixing of the components will also cause the problem of low mixing uniformity, which is not conducive to giving full play to the role of each component itself and affecting the performance of the prepared concrete; while in Example 1, the preparation method provided by the present invention is adopted, and the deformation component is first mixed with sufficient water to form a slurry ( That is, mixture A). Since the deformation component is easy to agglomerate when it meets a small amount of water, the deformation component is first stirred in water to form a slurry. This can effectively avoid the deformation component agglomerating when the subsequent components are mixed, resulting in poor homogeneity and the deformation component cannot fully play its role in concrete. At the same time, the skeleton component and the strength component are pre-mixed (obtaining mixture B), and the strength component is broken up by the impact of the skeleton component to improve the mixing uniformity. The thickening component is also pre-mixed into the liquid component (obtaining mixture C) to give full play to the role of a small amount of thickening component, further improving the mixing uniformity of mixtures A, B, and C in S4, so as to better play the role of each component and improve the performance of the prepared concrete.

[0096] ② Through the comparison of test data, it can be seen that although the same component ratio, raw materials and concrete preparation method are used, under different deformation component treatment methods, the concrete prepared in Comparative Example 4 is compared with the concrete prepared in Example 3. Although the compressive strength is not significantly reduced (meets the required concrete standard), the elastic modulus is greatly increased and does not meet the required standard (elastic modulus <2000MPa), and therefore the elasticity / strength ratio is also significantly higher than the concrete prepared in Example 3 and does not meet the required concrete standard (elasticity / strength ratio <200).

[0097] Among them, Comparative Example 4 adopts a different deformation component processing method, that is, bentonite, sepiolite powder and attapulgite are directly mixed and then concrete is prepared. In Example 3, the above components are acidified and modified in advance, hydrochloric acid is first added to acidify the deformation component, and an ultrasonic dispersion device is used to disperse it. The large solid particles in the mixture are crushed by the vibration and dispersion of the ultrasonic wave, so that the solid and liquid are mixed more fully, and the acidification reaction is promoted to be complete, thereby removing impurities inside the network structure of the deformation component, increasing the effective porosity of the network structure, and then improving the embedding and retention capacity of the deformation component for the strength component in the subsequent concrete preparation process; and then the deformation component after dispersion and acidification is heated and epoxy-modified silicone oil is added for modification. The epoxy-modified silicone oil can be filled into the network structure after the porosity of the deformation component is increased, making it elastic, thereby improving the deformation capacity of the deformation component in the concrete preparation process, and further improving the effect of the deformation component on the toughening of the concrete after combining with other components. Since Comparative Example 4 did not adopt the above-mentioned acidification modification treatment method, the embedding and retention capacity of the deformation component on the strength component was affected, and the effect of the deformation component itself could not be fully exerted, which had a certain impact on the performance of the prepared concrete, especially the elastic modulus, making the toughness and crack resistance of the concrete unable to meet the construction requirements of high-bearing-capacity flexible anti-seepage wall on soft soil foundation.

[0098] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A plastic concrete suitable for anti-seepage walls of soft soil foundations, characterized in that: In parts by weight, it includes: Strength component 210-250 parts, deformation component 80-90 parts, thickening component 0.1-0.2 parts, skeleton component 1900-1950 parts, liquid component 211-251.2 parts; The strength component includes cement, fly ash microspheres, and metakaolin, and the mass ratio thereof is 16:3:1; the deformation component includes bentonite, sepiolite powder, and attapulgite; the thickening component includes cellulose and amylase; the skeleton component includes sand and stone; and the liquid component includes mixing water and a water reducer; The plastic concrete suitable for the anti-seepage wall of soft soil foundation is prepared by the following method: S1. Weigh the deformed components, add them into a water tank filled with water, mix them thoroughly and stir them evenly to obtain a mixture A; S2, weighing the skeleton component and the strength component, mixing and stirring them to obtain a mixture B; S3, weighing the thickening component and the liquid component, mixing and stirring them to obtain a mixture C; S4, adding the mixture C to the mixture B and stirring evenly, then adding the mixture A and continuing to stir evenly to obtain plastic concrete suitable for high-bearing capacity flexible anti-seepage walls on soft soil foundations.

2. The plastic concrete suitable for the anti-seepage wall of soft soil foundation according to claim 1, characterized in that: In the deformation component, the mass ratio of bentonite, sepiolite powder and attapulgite is 18:1:

1.

3. The plastic concrete suitable for soft soil foundation anti-seepage wall according to claim 1, characterized in that: In the thickening component, the mass ratio of cellulose to amylase is 7:

3.

4. The plastic concrete suitable for the anti-seepage wall of soft soil foundation according to claim 1, characterized in that: Among the skeleton components, the mass proportion of sand is 47-53%.

5. The plastic concrete suitable for the anti-seepage wall of soft soil foundation according to claim 1, characterized in that: The liquid component includes 210-250 parts of mixing water and 1-1.2 parts of a water reducing agent.

6. The method for preparing plastic concrete suitable for anti-seepage walls of soft soil foundations according to claim 1, characterized in that: In S1, the deformed component is first subjected to an acidification modification treatment before being added to the water tank, and the treatment method includes: S11, placing a mixture of 72-81 parts of bentonite, 4-4.5 parts of sepiolite powder and 4-4.5 parts of attapulgite into an ultrasonic dispersing device filled with 8%-10% hydrochloric acid solution, starting the ultrasonic dispersing device, dispersing and acidifying the mixture at 40° C.-50° C., and completing the acidification after 12 hours, washing the mixture to neutrality and drying to obtain a purified deformation component; S12, heating the purified deformation component to 150°C-200°C, adding 3-5 parts of epoxy-modified silicone oil, stirring evenly, cooling to room temperature and drying, thereby obtaining a modified deformation component.

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