Plastic concrete for diaphragm wall as well as preparation method and detection device of plastic concrete

Abstract

The invention relates to the technical field of plastic concrete, in particular to plastic concrete for an anti-seepage wall and a preparation method and a detection device.The plastic concrete for the anti-seepage wall comprises a supporting piece, a leakage point detection piece, a pressure detection piece and an adjusting piece, the supporting piece comprises a detection frame, and two mesh plates are symmetrically and vertically arranged in the detection frame; two mesh plates are arranged in the detection frame, the outer side end faces of the two mesh plates are fixed to the inner wall of the detection frame, leakage point detection pieces are horizontally and slidably assembled on the two sides of the interior of the detection frame, plastic concrete test blocks are filled between the two mesh plates of the detection frame and the adjacent leakage point detection pieces, and pressure detection pieces are arranged on the top faces of the two mesh plates. And the middle part of the bottom surface of the detection frame is vertically communicated and assembled with an adjusting piece. The leakage point detection piece is arranged on the other side of the test block formed by plastic concrete pouring, the permeation point of the test block formed by plastic concrete pouring is judged, and meanwhile the water permeability of the test block formed by plastic concrete pouring under different pressures is judged.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic concrete, and particularly relates to a plastic concrete for cutoff walls, a preparation method thereof, and a detection device thereof. Background Art

[0002] A cutoff wall is a structure used to prevent groundwater seepage and control groundwater flow, and is widely used in water conservancy projects, civil engineering projects, and environmental engineering projects. The main function of the cutoff wall is to reduce or prevent water from seeping through soil or other media, thereby protecting the building foundation, preventing soil erosion, controlling the groundwater level, and preventing the spread of pollutants, etc. Plastic concrete needs to be used during the pouring of the cutoff wall to ensure the waterproof effect of the cutoff wall. Plastic concrete is a type of concrete with high fluidity and plasticity, and is usually used in construction occasions that require high fluidity to fill complex shapes and narrow spaces. Compared with ordinary concrete, plastic concrete has better workability and can be more easily poured and compacted without sacrificing strength. At the same time, the impermeability of the plastic concrete used in the cutoff wall is an important index parameter.

[0003] The existing patent with publication number CN218995071U and name "A Detection Device for the Permeability Coefficient of a Plastic Concrete Cutoff Wall" includes a bracket. An inner part of the top of the bracket is movably sleeved with a support cylinder. A rubber ring is fixedly installed at the bottom of the support cylinder. An injection pipe is communicated with one side of the support cylinder. A pressure relief valve is installed at the top of the injection pipe. A piston is movably sleeved inside the support cylinder. A liquid level sensor is installed at the bottom of the piston. A hydraulic rod is fixedly installed at the top of the piston. A support frame is fixedly installed at the top of the hydraulic rod. By setting the hydraulic rod and the liquid level sensor, the hydraulic rod can apply a pressure to water, which is convenient for increasing seepage and facilitating the simulation of the relationship between different water pressures and seepage flows, increasing the convenience of multi-angle detection. At the same time, the liquid level sensor senses the liquid level. Since the volume inside the support cylinder is fixed, the volume of the liquid level can be detected in cooperation, and then the seepage flow can be judged assistantly, increasing the convenience of multi-angle detection.

[0004] However, when the above-mentioned plastic concrete is subjected to impermeability detection and observing the impermeability parameters of the plastic concrete, the water permeability of the plastic concrete is judged according to the change of the water level in the support cylinder. However, this method can only detect the impermeability of the cutoff wall made of plastic concrete with a single thickness. During the detection, the change of a single water level cannot accurately judge the water permeability of the cutoff wall made of plastic concrete, and it is impossible to judge whether water permeates through the cutoff wall made of plastic concrete, thereby resulting in poor detection accuracy of the impermeability of the cutoff wall made of plastic concrete. Summary of the Invention

[0005] The present invention solves the problems in the related art and provides a plastic concrete for cutoff walls, a preparation method thereof, and a detection device thereof.

[0006] To solve the above technical problems, the present invention is realized through the following technical solutions: A plastic concrete for cut-off wall, characterized in that the composition is as follows by weight parts: 9-35 parts of modified soil, 0.1-5 parts of chitosan, 10-30 parts of cement, 25-45 parts of aggregate, 20-40 parts of recycled sand, 0.2-6 parts of admixture; 15-35 parts of water; The water-binder ratio of the plastic concrete is 0.5-1.0, the sand ratio is 70%-100%, and the unit water consumption is 280-350 kg / m; The modified soil includes bentonite and red mud, and is subjected to calcination treatment; The chitosan is one or any combination of carboxymethyl chitosan, N-carboxymethyl chitosan, O-carboxymethyl chitosan, and N,O-carboxymethyl chitosan; The aggregate includes two types: coarse aggregate and fine aggregate; The admixture includes water reducer, air-entraining agent, defoaming agent, and modified fiber.

[0007] As a preferred scheme, the bentonite is one or any combination of sodium-based bentonite, calcium-based bentonite, magnesium-based bentonite, and aluminum-based bentonite; The red mud is the industrial waste discharged during the extraction of alumina in the aluminum industry, specifically one or any combination of Bayer red mud, sintering red mud, and combined Bayer-sintering red mud; The coarse aggregate is made by soaking 5-20 mm crushed stone in a slurry prepared by mixing cement and rubber powder in a ratio of 1:1, and then draining and air-drying; The fine aggregate is modified concrete aggregate, and the fineness modulus of the fine aggregate is 2.8-3.2.

[0008] As a preferred scheme, the cement is one or any combination of commercially available ordinary Portland cement, slag-based geopolymer cement, alkali-activated slag cement, or sulfoaluminate cement, and its dosage is 10-30 parts; The recycled sand is one or any combination of recycled fine sand and manufactured sand produced by crushing concrete, and its dosage is 20-40 parts.

[0009] As a preferred scheme, the water reducer is one or any combination of naphthalene-based superplasticizer, lignosulfonate water reducer, amino superplasticizer, and polycarboxylate superplasticizer, and its dosage accounts for 25-60 wt% of the admixture; The air-entraining agent is one or any combination of rosin resin-based air-entraining agent, alkyl air-entraining agent, and sulfonate air-entraining agent, and its dosage accounts for 15-30 wt% of the admixture; The defoamer described above is one or any combination of silicone defoamers, polyether defoamers, polyether-modified polysiloxane defoamers, etc., and its dosage accounts for 5-20 wt% of the admixture; The modified fiber described above is rice husk fiber, and the modification treatment includes the following steps: S1. Treat with 3 wt% NaOH solution at 80 °C for 2 hours; S2. It is made by drying and modifying with KH550 silane coupling agent at 60 °C.

[0010] A preparation method of plastic concrete includes the following steps: S1. Dry bentonite and red mud and then screen them through a sieve to remove particles larger than 0.075 mm to prepare modified soil. At the same time, accurately proportion the coarse aggregate and fine aggregate in the aggregate to make the aggregate; S2. In a stirring device, mix the aggregate and recycled sand evenly; then add the screened modified soil and cement into the stirring device and stir and mix evenly; S3. Stir and mix water and chitosan evenly to help the dispersion of chitosan, and add them into the stirring device together with the admixture and stir and mix evenly; S4. Transfer to an impervious wall mold and vibrate or ram it into shape, and cure to obtain plastic concrete.

[0011] A detection device for plastic concrete includes a support member, a leak point detection member, a pressure detection member and an adjustment member. The support member includes a detection frame. Inside the detection frame, two mesh plates are symmetrically and vertically arranged. And the outer end faces of the two mesh plates are fixed on the inner wall of the detection frame. On both sides inside the detection frame, leak point detection members are horizontally slidably assembled. And plastic concrete test blocks are filled between the two mesh plates of the detection frame and the adjacent leak point detection members. A pressure detection member is arranged on the top surfaces of the two mesh plates. In the middle of the bottom surface of the detection frame, an adjustment member is vertically connected and assembled.

[0012] As a preferred solution, a water level observation window is fixedly penetrated through the middle of the front end face of the detection frame. And scale lines are vertically arranged on both sides of the water level observation window. Tempered glass is fixedly sealed inside the water level observation window. Slide frame plates are horizontally fixed on both sides of the top surface of the detection frame. And scale plates are horizontally fixed on the slide frame plates. Adjusting screws are horizontally rotatably connected to both sides of the front and rear vertical end faces of the detection frame. And multiple support columns are vertically fixed on the bottom surface of the detection frame.

[0013] As a preferred solution, the leak point detection piece includes an insertion frame, a slot frame and a pressing plate. The insertion frame is vertically inserted into the inside of the detection frame, and sliders are horizontally fixed at both ends of the top surface of the insertion frame. The sliders are horizontally slidably assembled with a sliding frame plate, and pointers are horizontally fixed at the ends of the sliders, and the pointers correspond to the scales on the scale plate. The slot frame is vertically slidably inserted into the insertion frame, and two hole frames are vertically and symmetrically fixed on the vertical end surface of the slot frame away from the mesh plate. The pressing plate presses against the vertical end surface of the slot frame away from the mesh plate, and a sliding rod is horizontally fixed on the vertical end surface of the pressing plate away from the slot frame. The sliding rod horizontally slides through and is assembled in the hole frame, and a first spring is horizontally fixed on the outer part of the sliding rod, and both ends of the first spring are respectively fixed on the end of the sliding rod and the hole frame. A mesh frame is fixed on the vertical end surface of the pressing plate, and the mesh frame is inserted into the slot frame, and a cobalt chloride test paper cotton block is filled and inserted at the top end of the mesh frame. A threaded hole plate is vertically fixed on the bottom surface of the slider, and the threaded hole plate is threadedly penetrated and assembled with an adjusting screw rod.

[0014] As a preferred solution, the pressure detection piece includes a box body. The box body is arranged above the two mesh plates, and the bottom surface of the box body is open. The bottom surface of the box body is fixed on the top surface of the detection frame, and a through groove is vertically penetrated and fixed in the middle of the top surface of the box body. A top plate is horizontally fixed inside the box body, and a floating platform is fixed on the bottom surface of the top plate. A vertical rod is vertically penetrated and fixed on the top surface of the top plate through the top surface of the box body, and a second spring is vertically sleeved on the top of the vertical rod, and both ends of the second spring are respectively fixed on the top surface of the box body and the top end surface of the vertical rod. A scale bar is vertically fixed on the top surface of the top plate, and the scale bar penetrates through the through groove of the box body.

[0015] As a preferred solution, a threaded hole is vertically penetrated and fixed in the middle of the bottom surface of the detection frame. The adjusting piece includes an adjusting pipe. The top end of the adjusting pipe is connected and fixed with a threaded cap, and the threaded cap is threadedly assembled in the threaded hole on the bottom surface of the detection frame. A liquid inlet pipe and a gas inlet pipe are connected and fixed on the bottom surface of the adjusting pipe, and valves are connected and assembled on both the liquid inlet pipe and the gas inlet pipe.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: During the use of the present invention, according to the design thickness requirements of the impervious wall, the above-mentioned plastic concrete is used to pour test blocks, and then the test blocks formed by pouring plastic concrete are respectively placed inside the detection frame, on both sides of the two mesh plates. One side of the test block formed by pouring plastic concrete is closely attached to the adjacent mesh plate, and then the leak point detection piece is slid horizontally inside the detection frame so that the side end surface of the leak point detection piece is closely attached to the test block formed by pouring plastic concrete. Water is injected into the inside of the detection frame between the two mesh plates through the adjusting piece, so that the water fills between the two mesh plates. Later, air is added to the water through the adjusting piece, and the pressurized water passes through the mesh plate to simulate the rate of water passing through the test block formed by pouring plastic concrete under different pressures. At the same time, by arranging the leak point detection piece on the other side of the test block formed by pouring plastic concrete, the penetration point of the test block formed by pouring plastic concrete is judged, and the water permeability of the test block formed by pouring plastic concrete under different pressures is judged. Brief Description of the Drawings

[0017] Figure 1 is a schematic diagram of the overall structure of the detection device of the present invention; Figure 2 is a schematic exploded view of the detection device of the present invention; Figure 3 is a schematic diagram of the support member in the exploded state in the embodiment of the detection device of the present invention; Figure 4 is a schematic diagram of the leak point detection member in the exploded state in the embodiment of the detection device of the present invention; Figure 5 is a schematic diagram of the pressure detection member in the exploded state in the embodiment of the detection device of the present invention; Figure 6 is a schematic diagram of the adjusting member in the exploded state in the embodiment of the detection device of the present invention.

[0018] In the figures: 1, support member; 11, detection frame; 12, mesh plate; 13, water level observation window; 131, scale line; 132, toughened glass; 14, sliding frame plate; 15, scale plate; 16, adjusting screw; 17, screw hole; 18, support pillar; 2, leak point detection member; 21, insertion frame; 22, slider; 221, pointer; 222, screw hole plate; 23, slot frame; 24, hole frame; 241, first spring; 25, pressing plate; 251, sliding rod; 252, mesh frame; 253, cobalt chloride cotton block; 3, pressure detection member; 31, box body; 311, through groove; 32, top plate; 33, floating platform; 34, vertical rod; 35, second spring; 36, scale bar; 4, adjusting member; 41, adjusting pipe; 42, liquid inlet pipe; 43, air inlet pipe; 44, valve; 45, screw cap. Detailed Description of the Invention

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way restrictive of the present invention and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0020] It should be noted that the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0021] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed herein, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, further discussion thereof is not required in subsequent drawings.

[0022] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom" are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the protection scope of the present invention; the orientation words "inner, outer" refer to the inside and outside relative to the contour of each component itself.

[0023] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "upper", etc. can be used here to describe the spatial positional relationship of a device or feature shown in the figure with other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figure for the device. For example, if the device in the attached drawing is inverted, the device described as "above or over other devices or structures" will then be positioned "below or under other devices or structures". Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations are made for the spatial relative descriptions used here.

[0024] In addition, it should be noted that the use of terms such as "first", "second", etc. to define components is only for the convenience of differentiating the corresponding components. Without additional statements, the above terms have no special meanings, and thus should not be construed as limiting the protection scope of the present invention.

[0025] A plastic concrete for cutoff wall, characterized in that the composition is as follows by weight parts: 9 - 35 parts of modified soil, 0.1 - 5 parts of chitosan, 10 - 30 parts of cement, 25 - 45 parts of aggregate, 20 - 40 parts of recycled sand, 0.2 - 6 parts of admixture; 15 - 35 parts of water; The water - binder ratio of the plastic concrete is 0.5 - 1.0, the sand ratio is 70% - 100%, and the unit water consumption is 280 - 350 kg / m; The modified soil includes bentonite and red mud, and is subjected to calcination treatment; The chitosan is one or any combination of carboxymethyl chitosan, N - carboxymethyl chitosan, O - carboxymethyl chitosan, and N,O - carboxymethyl chitosan. Chitosan is an organic substance with good toughening effect. Adding chitosan will enhance the toughness of the cementitious material paste, and its cost is low. However, since chitosan is not easily soluble in water and acidic solutions, its derivative - carboxymethyl chitosan and its derivatives are selected, which have good water solubility and environmental friendliness, etc.; The aggregate includes two types: coarse aggregate and fine aggregate; The admixture includes water - reducing agent, air - entraining agent, defoaming agent, and modified fiber, Industrial solid waste red mud is used as a mineral admixture, which can dispose of a large amount of red mud. At the same time, taking advantage of the characteristics of large specific surface area and good dispersibility of red mud, it plays a role in filling and compacting, improving the impermeability of plastic concrete. Chitosan is added to toughen and modify the cementitious material. Utilizing the good toughening effect of chitosan, the toughness of plastic concrete is significantly improved. The coarse aggregate uses porous aggregate. Taking advantage of the characteristics of porous structure and high water absorption of porous aggregate, a treatment method similar to that of lightweight aggregate is adopted, enabling the plastic concrete to have an internal curing function. While improving the interfacial transition zone, the bonding force between the aggregate and the paste is increased, resulting in an increase in the strength of plastic concrete. The fine aggregate uses recycled sand. In the case of the increasing shortage of natural sand resources and the prohibition of mining, exploring new development directions helps the green and sustainable development of the construction industry, reduces production costs, and has good economic and social benefits. Its cement consumption can be significantly reduced, and at the same time, it can dispose of a large amount of industrial solid waste and construction waste, playing a role in cost reduction, which corresponds to the advantages and innovation of the present invention above. It can dispose of a large amount of industrial solid waste and construction waste, playing a role in cost reduction, which corresponds to the advantages and innovation of the present invention above.

[0026] The bentonite described is one or any combination of sodium-based bentonite, calcium-based bentonite, magnesium-based bentonite, and aluminum-based bentonite. Bentonite is mainly composed of clay minerals of the montmorillonite type, one of the most common industrial clays, belonging to natural pozzolanic materials. It has low cost, good adsorption, and good compatibility and chemical inertness with cement, mortar, and concrete. However, since bentonite belongs to clay minerals with relatively low activity, the bentonite used in the present invention is calcined to activate its pozzolanic activity; The red mud described is the industrial waste residue discharged during the extraction of alumina in the aluminum industry, specifically one or any combination of Bayer process red mud, sintering process red mud, and combined process red mud. Red mud has the characteristics of large specific surface area and good dispersibility. Applying it as a mineral admixture in plastic concrete can improve the compactness of the plastic concrete structure and the impermeability of plastic concrete; The coarse aggregate is made by soaking and treating 5 - 20 mm crushed stones with a slurry prepared by mixing cement and rubber powder in a ratio of 1:1, and then draining and air-drying. The coarse aggregate is 5 - 20 mm crushed stones obtained by crushing the mountain stones excavated during the construction of the tailings dam (its quality meets the technical requirements of "Coarse and Fine Aggregates for Concrete" (GB / T 14685)), and is obtained after pretreatment with a pretreatment technology. The pretreatment technology of the coarse aggregate is to soak and treat the crushed stones with a slurry prepared by mixing cement and rubber powder in a ratio of 1:1 for 30 minutes, and then drain and air-dry to obtain the pretreated coarse aggregate. The elastic modulus of the aggregate, especially the coarse aggregate, has a direct impact on the elastic modulus of the concrete. The larger the elastic modulus of the coarse aggregate, the larger the elastic modulus of the concrete. The pretreated coarse aggregate can effectively reduce the impact of the high elastic modulus of the coarse aggregate on the elastic modulus of plastic concrete; The impact of the elastic modulus of the coarse aggregate on the elastic modulus of plastic concrete; The fine aggregate is a modified concrete aggregate, with a fineness modulus of 2.8 - 3.2. The fine aggregate is produced by crushing the excavated mountain stones during the construction of the tailings dam, and its quality meets the technical requirements of "Sand for Construction" (GB / T 14684), with a fineness modulus of 2.8 - 3.2. By using the excavated mountain stones during the construction of the tailings dam for processing and crushing, restricting the fineness modulus of the fine aggregate can increase the sand ratio in the concrete, resulting in a decrease in the relative proportion of the coarse aggregate, and thus a relative decrease in the elastic modulus of the concrete. Both the coarse aggregate and the fine aggregate are porous aggregates, which are characterized by being porous and having a high water absorption rate. The porous aggregates are pre-wetted, enabling this plastic concrete to have an internal curing function. While effectively improving the interfacial transition zone, some of the powder will enter the interior of the porous aggregates, enhancing the bonding force between the paste and the aggregates, and overall increasing the strength of the plastic concrete. At the same time, both red mud and chitosan have strong adsorption characteristics, which contribute to the water retention of the plastic concrete and the adsorption of external moisture, reducing the harmful pore structure inside the concrete. The three work together to form a plastic concrete material with a strong pumping and suction effect, adsorbing a large amount of water and harmful substances, and these adsorbed substances can migrate in the porous aggregates to form a pumping pipeline, enhancing the impermeability of the plastic concrete and increasing the service life of the plastic concrete. The large-scale use of industrial solid waste can effectively dispose of waste and reduce production costs, having good economic and social benefits.

[0027] The cement described is one or any combination of commercially available ordinary Portland cement, slag-based geopolymer cement, alkali-activated slag cement, or sulfoaluminate cement, with a dosage of 10 - 30 parts. The recycled sand described is one or any combination of recycled fine sand produced from crushed concrete and machine-made sand, with a dosage of 20 - 40 parts.

[0028] The water reducer described is one or any combination of naphthalene-based high-performance water reducers, sodium lignosulfonate water reducers, amino high-performance water reducers, and polycarboxylate high-performance water reducers. Its dosage accounts for 25 - 60 wt% of the admixtures, and a naphthalene-based water reducer with a water reduction rate of not less than 20% is added. The performance of the water reducer meets the technical requirements of "Concrete Admixtures" (GB 8076). By incorporating a high-water-reduction-rate water reducer, the mixing water and binder dosage are reduced, the density of the plastic concrete is increased, and the early dry shrinkage of the plastic concrete is reduced. The air-entraining agent mentioned above is one or any combination of rosin resin-based air-entraining agents, alkyl air-entraining agents, and sulfonic acid air-entraining agents, and its dosage accounts for 15-30 wt% of the admixture. The air-entraining agent is an air-entraining agent that meets the technical requirements of "Concrete Admixtures" (GB8076). By using a relatively large dosage of air-entraining agent, the air content of the concrete mixture is controlled within 10% - 15%. The high air content can effectively reduce the elastic modulus of the plastic concrete while improving the workability of the plastic concrete mixture. The defoaming agent mentioned above is one or any combination of silicone defoaming agents, polyether defoaming agents, and polyether-modified polysiloxane defoaming agents, and its dosage accounts for 5-20 wt% of the admixture. The modified fiber mentioned above is rice husk fiber, and the modification treatment includes the following steps: S1. Treat with 3 wt% NaOH solution at 80 °C for 2 hours; S2. It is made by drying and modifying with KH550 silane coupling agent at 60 °C. The rice husk fiber is polypropylene short fiber with a tensile strength ≥ 270 MPa and an elastic modulus ≤ 3.8 GPa.

[0029] By incorporating Dura fiber with good adaptability to concrete, the durability of plastic concrete can be significantly improved, the early drying shrinkage problem of plastic concrete caused by high dosage of modified soil and high air content can be reduced, and the formation of early shrinkage cracks can be decreased.

[0030] A preparation method of plastic concrete includes the following steps: S1. Dry bentonite and red mud and then screen them through a sieve to remove particles with a size larger than 0.075 mm to prepare modified soil. At the same time, accurately proportion the coarse aggregate and fine aggregate in the aggregate to make the aggregate. S2. In the mixing device, mix the aggregate and recycled sand evenly; then add the screened modified soil and cement into the mixing device and mix them evenly. S3. Mix water and chitosan evenly to help the dispersion of chitosan, and then add them into the mixing device together with the admixture and mix them evenly. S4. Transfer to the impervious wall mold and vibrate or tamp to form, and cure to obtain plastic concrete.

[0031] Such as Figure 1 And Figure 2As shown in the figure, a detection device for plastic concrete includes a support member 1, a leak point detection member 2, a pressure detection member 3, and an adjustment member 4. The support member 1 includes a detection frame 11. Inside the detection frame 11, two mesh plates 12 are symmetrically and vertically arranged. The outer end faces of the two mesh plates 12 are fixed on the inner wall of the detection frame 11. On both sides inside the detection frame 11, leak point detection members 2 are horizontally slidably assembled. Between the two mesh plates 12 of the detection frame 11 and the adjacent leak point detection members 2, plastic concrete test blocks are filled. On the top surfaces of the two mesh plates 12, a pressure detection member 3 is arranged. In the middle of the bottom surface of the detection frame 11, an adjustment member 4 is vertically and communicatively assembled. During use, according to the design thickness requirements of the impervious wall, test blocks are formed by pouring the above-mentioned plastic concrete. Then, the test blocks formed by pouring the plastic concrete are respectively placed inside the detection frame 11, on both sides of the two mesh plates 12. One side of the test block formed by pouring the plastic concrete is closely attached to the adjacent mesh plate 12. Then, the leak point detection member 2 is slid horizontally inside the detection frame 11 so that the side end face of the leak point detection member 2 is closely attached to the test block formed by pouring the plastic concrete. Water is injected into the space between the two mesh plates 12 inside the detection frame 11 through the adjustment member 4, so that the water fills the space between the two mesh plates 12. Later, air is added to the water by starting the adjustment member 4. By pressurizing the water to pass through the mesh plate 12, the rate of water passing through the test block formed by pouring the plastic concrete under different pressures is simulated. At the same time, by arranging the leak point detection member 2 on the other side of the test block formed by pouring the plastic concrete, the penetration point of the test block formed by pouring the plastic concrete is judged, and the water permeability of the test block formed by pouring the plastic concrete under different pressures is judged.

[0032] In one embodiment, as Figure 2 and 3 shown, a water level observation window 13 is fixedly penetrated in the middle of the front end face of the detection frame 11. On both sides of the water level observation window 13, scale lines 131 are vertically arranged. Inside the water level observation window 13, a tempered glass 132 is fixedly sealed. On both sides of the top surface of the detection frame 11, sliding frame plates 14 are horizontally fixed. On the sliding frame plates 14, scale plates 15 are horizontally fixed. On both sides of the front and rear vertical end faces of the detection frame 11, adjusting screws 16 are horizontally rotatably connected. On the bottom surface of the detection frame 11, multiple support columns 18 are vertically fixed. The tempered glass 132 installed in the water level observation window 13 provided at the front end of the detection frame 11 is used to cooperate with the scale lines 131 to observe the water level in the detection frame 11, and the penetration water volume of the test block formed by pouring the plastic concrete is judged by the water level change. At the same time, the sliding frame plates 14 and the adjusting screws 16 provided on the detection frame 11 are used to guide and drive the leak point detection member 2 to slide so that it is closely attached to the test block formed by pouring the plastic concrete, meeting the detection requirements of test blocks formed by pouring plastic concrete with different thicknesses.

[0033] In one embodiment, as Figure 2 and 4As shown, the leak point detection component 2 includes an insertion frame 21, a slot frame 23 and a pressing plate 25. The insertion frame 21 is vertically inserted into the interior of the detection frame 11. At both ends of the top surface of the insertion frame 21, sliders 22 are horizontally fixed. The sliders 22 are horizontally slidably assembled with a sliding frame plate 14. At the end of the slider 22, a pointer 221 is horizontally fixed, and the pointer 221 corresponds to the scale on the scale plate 15. The slot frame 23 is vertically slidably inserted into the insertion frame 21. On the vertical end surface of the slot frame 23 away from the mesh plate 12, two hole frames 24 are vertically symmetrically fixed. The pressing plate 25 presses against the vertical end surface of the slot frame 23 away from the mesh plate 12. On the vertical end surface of the pressing plate 25 away from the slot frame 23, a sliding rod 251 is horizontally fixed. The sliding rod 251 horizontally slides through and is assembled in the hole frame 24. On the outer part of the sliding rod 251, a first spring 241 is horizontally fixed, and both ends of the first spring 241 are respectively fixed on the end of the sliding rod 251 and the hole frame 24. On the vertical end surface of the pressing plate 25, a mesh frame 252 is fixed, and the mesh frame 252 is inserted into the slot frame 23. At the top end of the mesh frame 252, a cobalt chloride test paper cotton block 253 is filled and inserted. On the bottom surface of the slider 22, a threaded hole plate 222 is vertically fixed, and the threaded hole plate 222 is threadedly penetrated and assembled with the adjusting screw rod 16. During use, the pressing plate 25 is pulled. The pressing plate 25 slides and is guided in the hole frame 24 by the sliding rod 251, squeezing the first spring 241 to deform, driving the pressing plate 25 to move away from the slot frame 23, so that the mesh frame 252 slides out of the slot frame 23. The cobalt chloride test paper cotton block 253 is inserted into the mesh frame 252. When the pressing plate 25 is released, under the action of the deformation force of the first spring 241, the sliding rod 251 on the pressing plate 25 slides and is guided in the hole frame 24 to insert the mesh frame 252 on the pressing plate 25 into the slot frame 23, thus completing the disassembly, assembly and replacement of the cobalt chloride test paper cotton block 253 in the mesh frame 252. Then, the slot frame 23 is inserted into the insertion frame 21, and the adjusting screw rod 16 is rotated to cooperate with the threaded hole plate 222 to drive the insertion frame 21 to slide in the slider 22, driving the mesh frame 252 to press against the outside of the test block formed by the plastic concrete pouring. When the test block formed by the plastic concrete pouring leaks in the later stage, the leaked water passes through the mesh frame 252 and contacts the cobalt chloride test paper cotton block 253. The cobalt chloride test paper cotton block 253 turns blue when it meets water. Observe the water seepage position of the test block formed by the plastic concrete pouring at different heights, so as to accurately detect the water seepage position of the test block formed by the plastic concrete pouring at different heights, and thus judge the water permeability of the test block formed by the plastic concrete pouring.

[0034] In one embodiment, as Figure 2 and Figure 5As shown, the pressure detection member 3 includes a box body 31. The box body 31 is arranged above the two mesh plates 12, and the bottom surface of the box body 31 is open. The bottom surface of the box body 31 is fixed on the top surface of the detection frame 11. A through groove 311 is vertically penetrated and fixed in the middle of the top surface of the box body 31. A top plate 32 is horizontally fixed inside the box body 31, and a floating platform 33 is fixed on the bottom surface of the top plate 32. A vertical rod 34 is vertically penetrated and fixed on the top surface of the top plate 32 through the top surface of the box body 31. A second spring 35 is vertically sleeved on the top of the vertical rod 34, and the two ends of the second spring 35 are respectively fixed on the top surface of the box body 31 and the top end surface of the vertical rod 34. A scale bar 36 is vertically fixed on the top surface of the top plate 32, and the scale bar 36 is arranged through the through groove 311 of the box body 31. During use, water is added between the two mesh plates 12 of the detection frame 11. When the water enters, under the buoyancy of the floating platform 33 on the bottom surface of the top plate 32, the top plate 32 is pushed to slide vertically upward on the box body 31. Then, air is added between the two mesh plates 12 of the detection frame 11. By increasing the water pressure between the two mesh plates 12 of the detection frame 11 with air, the vertical rod 34 on the top plate 32 is pushed to vertically move on the box body 31, pulling the second spring 35 to deform. The scale bar 36 on the top plate 32 vertically slides out from the through groove 311 of the box body 31. The length of the scale bar 36 sliding out of the top surface of the box body 31 is used to judge the pressure inside the box body 31, and further judge the water permeability of the test block formed by casting plastic concrete under different pressures.

[0035] In one embodiment, as Figure 2 and 6 shown, a screw hole 17 is vertically penetrated and fixed in the middle of the bottom surface of the detection frame 11. The adjusting member 4 includes an adjusting pipe 41. The top end of the adjusting pipe 41 is connected and fixed with a screw cap 45, and the screw cap 45 is threadedly assembled in the screw hole 17 on the bottom surface of the detection frame 11. A liquid inlet pipe 42 and a gas inlet pipe 43 are connected and fixed on the bottom surface of the adjusting pipe 41, and valves 44 are connected and assembled on both the liquid inlet pipe 42 and the gas inlet pipe 43. During use, the screw cap 45 at the top end of the adjusting pipe 41 in the adjusting member 4 is threadedly assembled in the screw hole 17 of the detection frame 11. When adding water, the valve on the liquid inlet pipe 42 is opened to add water between the two mesh plates 12 of the detection frame 11. Similarly, when adding gas, the valve 44 on the gas inlet pipe 43 is opened to add air between the two mesh plates 12 of the detection frame 11, so as to facilitate testing the water permeability of the test block formed by casting plastic concrete under different pressures.

[0036] In this embodiment, during use, according to the design thickness requirement of the impervious wall, test blocks are formed by pouring the above-mentioned plastic concrete. Then, the test blocks formed by pouring the plastic concrete are respectively placed inside the detection frame 11, on both sides of the two mesh plates 12. One side of the test block formed by pouring the plastic concrete is closely attached to the adjacent mesh plate 12. Then, the leak point detection member 2 is slid horizontally inside the detection frame 11, so that the side end face of the leak point detection member 2 is closely attached to the test block formed by pouring the plastic concrete. During use, the screw cap 45 at the top of the adjusting pipe 41 in the adjusting member 4 is threadedly assembled into the screw hole 17 of the detection frame 11. When adding water, the valve on the liquid inlet pipe 42 is opened to add water between the two mesh plates 12 of the detection frame 11. Similarly, when adding gas, the valve 44 on the gas inlet pipe 43 is opened to add air between the two mesh plates 12 of the detection frame 11. When adding water between the two mesh plates 12 of the detection frame 11, due to the buoyancy of the floating platform 33 on the bottom surface of the top plate 32, the top plate 32 is pushed to slide vertically upward on the box body 31. Then, when adding air between the two mesh plates 12 of the detection frame 11, the water pressure between the two mesh plates 12 of the detection frame 11 is increased by the air. The vertical rod 34 on the top plate 32 is pushed to move vertically on the box body 31 by the addition of air, pulling the second spring 35 to deform. The scale bar 36 on the top plate 32 slides vertically out of the through slot 311 of the box body 31. The pressure inside the box body 31 is judged by the length of the scale bar 36 sliding out of the top surface of the box body 31. By the adjusting member 4, water is added and filled between the two mesh plates 12 inside the detection frame 11. Later, air is added to the water by the adjusting member 4. The pressurized water passes through the mesh plate 12 to simulate the rate of water passing through the test block formed by pouring the plastic concrete under different pressures. At the same time, the pressing plate 25 is pulled. The pressing plate 25 slides and is guided on the sliding rod 251 in the hole frame 24, squeezing the first spring 241 to deform, driving the pressing plate 25 to move away from the slot frame 23, so that the mesh frame 252 slides out of the slot frame 23. The cobalt chloride test paper cotton block 253 is inserted into the mesh frame 252. When the pressing plate 25 is released, under the action of the deformation force of the first spring 241, the sliding rod 251 on the pressing plate 25 slides and is guided in the hole frame 24 to insert the mesh frame 252 on the pressing plate 25 into the slot frame 23, thus completing the disassembly, installation and replacement of the cobalt chloride test paper cotton block 253 in the mesh frame 252. Then, the slot frame 23 is inserted into the insertion frame 21. The adjusting screw 16 is rotated to cooperate with the screw hole plate 222 to drive the insertion frame 21 to slide in the slider 22, driving the mesh frame 252 to press against the outside of the test block formed by pouring the plastic concrete. When the test block formed by pouring the plastic concrete leaks later, the leaked water passes through the mesh frame 252 to contact the cobalt chloride test paper cotton block 253, and the cobalt chloride test paper cotton block 253 turns blue when encountering water. Observe the water seepage position of the test block formed by pouring the plastic concrete. By arranging the leak point detection member 2 on the other side of the test block formed by pouring the plastic concrete, the penetration point of the test block formed by pouring the plastic concrete is judged.

[0037] The above is a preferred embodiment of the present invention. Those skilled in the art to which the present invention pertains can also make changes and modifications to the above embodiment. Therefore, the present invention is not limited to the above specific embodiments, and any obvious improvements, substitutions or variations made by those skilled in the art based on the present invention fall within the protection scope of the present invention.

Claims

1. A plastic concrete for anti-seepage wall, characterized in that The composition is as follows by weight: 9-35 parts of modified soil, 0.1-5 parts of chitosan, 10-30 parts of cement, 25-45 parts of aggregate, 20-40 parts of regenerated sand, and 0.2-6 parts of admixture; 15-35 parts water; The water-cement ratio of the plastic concrete is 0.5-1.0, the sand ratio is 70%-100%, and the unit water consumption is 280-350kg / m; The modified soil includes bentonite and red mud and is calcined; The chitosan is one or any combination of carboxymethyl chitosan, N-carboxymethyl chitosan, O-carboxymethyl chitosan and N,O-carboxymethyl chitosan; The aggregate includes two types: coarse aggregate and fine aggregate; The additives include water reducing agent, air entraining agent, defoaming agent and modified fiber.

2. The plastic concrete for anti-seepage wall according to claim 1, characterized in that: The bentonite is one of sodium-based bentonite, calcium-based bentonite, magnesium-based bentonite, and aluminum-based bentonite, or a combination of any of the above; The red mud is industrial waste discharged when alumina is extracted in the aluminum industry, specifically, one or a combination of Bayer red mud, sintering red mud, and mixed red mud; The coarse aggregate is prepared by soaking 5-20 mm crushed stone in a slurry prepared by cement and rubber powder in a ratio of 1:1, and then draining and air-drying. The fine aggregate is a modified concrete aggregate, and the fineness modulus of the fine aggregate is 2.8-3.

2.

3. The plastic concrete for anti-seepage wall according to claim 1, characterized in that: The cement is one or any combination of commercially available ordinary Portland cement, slag-based polymer cement, alkali-activated slag cement or sulphoaluminate cement, and the amount thereof is 10-30 parts; The regenerated sand is one or any combination of regenerated fine sand and machine-made sand produced by crushing concrete, and the usage amount is 20-40 parts.

4. The plastic concrete for anti-seepage wall according to claim 1, characterized in that: The water reducer is one or any combination of naphthalene-based high-efficiency water reducer, lignin sulfonate sodium salt water reducer, amino high-efficiency water reducer, polycarboxylic acid high-efficiency water reducer, and its amount accounts for 25-60wt% of the admixture; The air entraining agent is one or any combination of rosin resin air entraining agent, alkyl air entraining agent, sulfonic acid air entraining agent, and its amount accounts for 15-30wt% of the admixture; The defoamer is one or any combination of silicone defoamers, polyether defoamers, polyether-modified polysiloxane defoamers, and the amount thereof accounts for 5-20wt% of the additive; The modified fiber is rice husk fiber, and the modification process comprises the following steps: S1, treating with 3wt% NaOH solution at 80°C for 2 hours; S2 is made by drying and modifying KH550 silane coupling agent at 60°C.

5. A method for preparing the plastic concrete according to any one of claims 1 to 4, comprising the following steps: S1. Drying bentonite and red mud and sieving them through a sieve to remove particles larger than 0.075 mm to prepare modified soil, and at the same time accurately mixing coarse aggregate and fine aggregate in the aggregate to prepare aggregate; S2. In a stirring device, the aggregate and the regenerated sand are mixed and stirred evenly; then the sieved modified soil and cement are added into the stirring device and stirred and mixed evenly; S3, stirring and mixing water and chitosan evenly, which helps to disperse chitosan, and adding water and admixtures into a stirring device and stirring and mixing evenly; S4. Transfer the concrete to a cut-off wall mold, perform vibration compaction or ramming to form the concrete, and perform curing to obtain plastic concrete.

6. A device for detecting plastic concrete according to any one of claims 1 to 4, characterized in that: The invention comprises a support member (1), a leakage point detection member (2), a pressure detection member (3) and an adjustment member (4), wherein the support member (1) comprises a detection frame (11), two mesh plates (12) are symmetrically and vertically arranged inside the detection frame (11), and the outer end surfaces of the two mesh plates (12) are fixed to the inner wall of the detection frame (11), the leakage point detection members (2) are horizontally slidably assembled on both sides of the inside of the detection frame (11), and the plastic concrete test block is filled between the two mesh plates (12) of the detection frame (11) and the adjacent leakage point detection members (2), the pressure detection member (3) is arranged on the top surfaces of the two mesh plates (12), and the adjustment member (4) is vertically connected and assembled in the middle of the bottom surface of the detection frame (11).

7. A plastic concrete detection device according to claim 6, characterized in that: A water level observation window (13) is fixedly passed through the middle of the front end surface of the detection frame (11), and scale lines (131) are vertically arranged on both sides of the water level observation window (13), and tempered glass (132) is sealed and fixed inside the water level observation window (13), sliding frame plates (14) are horizontally fixedly fixed on both sides of the top surface of the detection frame (11), and a scale plate (15) is horizontally fixed on the sliding frame plate (14), and both sides of the front and rear vertical end surfaces of the detection frame (11) are horizontally rotatably connected to adjusting screws (16), and a plurality of pillars (18) are vertically fixed on the bottom surface of the detection frame (11).

8. A plastic concrete detection device according to claim 7, characterized in that: The leakage point detection component (2) comprises an insertion frame (21), a slot frame (23) and a pressure plate (25); the insertion frame (21) is vertically inserted into the interior of the detection frame (11), and sliders (22) are horizontally fixed at both ends of the top surface of the insertion frame (21); the slider (22) is horizontally slidably assembled with a sliding frame plate (14), and a pointer (221) is horizontally fixed at the end of the slider (22), and the pointer (221) corresponds to the scale on the scale plate (15); the slot frame (23) is vertically slidably inserted into the insertion frame (21), and two hole frames (24) are vertically symmetrically fixed on the vertical end surface of the slot frame (23) away from the mesh plate (12); the pressure plate (25) is pressed against the vertical end surface of the slot frame (23) away from the mesh plate (12), A sliding rod (251) is horizontally fixed on the vertical end surface of the pressing plate (25) away from the slot frame (23), and the sliding rod (251) is horizontally slid through and assembled in the hole frame (24), and a first spring (241) is horizontally fixed on the outside of the sliding rod (251), and the two ends of the first spring (241) are respectively fixed to the end of the sliding rod (251) and the hole frame (24), a net frame (252) is fixed on the vertical end surface of the pressing plate (25), and the net frame (252) is inserted into the slot frame (23), and the top of the net frame (252) is filled and inserted with a cobalt chloride test paper cotton block (253), and a screw hole plate (222) is vertically fixed on the bottom surface of the sliding block (22), and the screw hole plate (222) and the adjusting screw (16) are threadedly assembled through and assembled.

9. A plastic concrete detection device according to claim 6, characterized in that: The pressure detection element (3) comprises a box body (31), the box body (31) being arranged above the two mesh plates (12), and the bottom surface of the box body (31) being arranged with an opening, the bottom surface of the box body (31) being fixed on the top surface of the detection frame (11), and a through groove (311) being vertically penetrated and fixed in the middle of the top surface of the box body (31), a top plate (32) being horizontally fixed inside the box body (31), and a floating platform (311) being fixed on the bottom surface of the top plate (32) 33), a vertical rod (34) is fixed on the top surface of the top plate (32) and vertically penetrates the top surface of the box body (31), and a second spring (35) is vertically sleeved on the top of the vertical rod (34), and two ends of the second spring (35) are respectively fixed to the top surface of the box body (31) and the top end surface of the vertical rod (34), and a scale bar (36) is vertically fixed on the top surface of the top plate (32), and the scale bar (36) penetrates the through slot (311) of the box body (31).

10. A plastic concrete detection device according to claim 6, characterized in that: A screw hole (17) is vertically penetrated and fixed in the middle of the bottom surface of the detection frame (11); the adjustment member (4) comprises an adjustment tube (41); a screw cover (45) is connected and fixed at the top end of the adjustment tube (41); and the screw cover (45) is threadedly assembled in the screw hole (17) on the bottom surface of the detection frame (11); a liquid inlet tube (42) and an air inlet tube (43) are connected and fixed on the bottom surface of the adjustment tube (41); and valves (44) are connected and assembled on the liquid inlet tube (42) and the air inlet tube (43).

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