UHPC with clay-like plasticity and method for producing same

Abstract

The application discloses a kind of UHPC with pottery clay-like plasticity and preparation method thereof, the formulation includes the following weight percentage components: gel material 140 parts-160 parts;Aggregate 140 parts-160 parts;Modified bentonite 20 parts-35 parts;Reinforcing fiber 3 parts-6 parts;Admixture 1 part-2.5 parts;The modified bentonite is sodium polyacrylate modified calcium-based bentonite.The application builds three-dimensional network structure by modified bentonite and gel material, significantly improves paste yield stress and thixotropy, keeps shape when standing, flows rapidly when shearing, can be bent, modified, shaped into standard workpieces using preset models;PVA / PP fiber and modified bentonite together enhance the density of interface transition zone, reduce the probability of microcrack initiation;Admixture system and modified bentonite produce ion-polymer-clay multiple adsorption, further delay hydration exothermic peak, widen shaping time window to more than 90 minutes, meet the needs of complex curved surface hand sculpture and thin-walled component integrated forming.

Description

Technical Field

[0001] This invention belongs to the field of new materials technology, and specifically relates to a UHPC with clay-like plasticity and its preparation method. Background Technology

[0002] Ultra-high performance concrete (UHPC) and its components have seen significant development in recent years due to their excellent mechanical properties, durability, applicability, and economy. It is one of the important fixing materials in the construction of high-performance component systems. It is a high-performance material composed of high-performance cementitious materials, early-strength aggregates, functional admixtures, and additives, and can be widely used in various structural parts and construction scenarios. Existing UHPC generally uses high-flowability or pumpable mixtures, with typical characteristics including: a low water-cement ratio (0.125–0.18), but still requiring a certain degree of fluidity (slump spread generally 550-700 mm); a formulation mainly composed of powdered cementitious materials (silica fume, mineral powder, ultrafine quartz powder); enhanced toughness through reinforcement with steel fibers or PVA; and molding primarily using methods such as casting, grouting, and spraying.

[0003] Therefore, the existing plastic forms of UHPC are all in a state of high flow or controllable flow, and can only be filled into complex molds under the action of gravity. There is no "plastic mixture form" like clay that can be kneaded by hand, rolled into sheets, and freely shaped.

[0004] This invention proposes a UHPC with clay-like plasticity and its preparation method by improving the formulation of ultra-high performance concrete. It is "clay-like" or "dough-like" and belongs to the viscoplastic fluid with extremely high static yield stress in rheology. It can be bent, modified and shaped into UHPC workpieces of various geometric shapes by pre-set model. Summary of the Invention

[0005] To address the problems in related technologies, this invention proposes a UHPC with clay-like plasticity and its preparation method, in order to overcome the aforementioned technical problems existing in the prior art.

[0006] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: A type of UHPC with clay-like plasticity comprises the following components by weight percentage: 140-160 parts of gel material; 140-160 parts aggregate; 20-35 parts modified bentonite; 3-6 parts reinforcing fiber; 1-2.5 parts of admixture.

[0007] As a preferred technical solution, the modified bentonite is calcium-based bentonite modified with sodium polyacrylate.

[0008] As a preferred technical solution, the modification method of the modified bentonite is as follows: Step 1: Dissolve sodium polyacrylate in deionized water to obtain a sodium polyacrylate solution; Step 2: Add dry calcium-based bentonite to the sodium polyacrylate solution and continue stirring to form PAAS-CaB slurry; Step 3: Dry the PAAS-CaB slurry in an oven, grind it, and sieve it to obtain modified bentonite.

[0009] As a preferred technical solution, the sodium polyacrylate content in the modified bentonite is 2%-8%. Sodium polyacrylate, as a highly absorbent resin, contains a large number of hydrophilic groups and has a three-dimensional cross-linked spatial network structure. When in contact with water, due to ionization, the concentration of cations within the network increases, and the osmotic pressure created by the concentration difference between the inside and outside causes water molecules to permeate inward, resulting in polymer expansion. The water absorption, swelling, and low permeability characteristics of natural bentonite mainly originate from the hydrophilic clay mineral montmorillonite. Due to the weak intermolecular forces between the layers of lamellar montmorillonite, water molecules easily enter the interlayer space, causing an increase in the interlayer spacing and volume expansion of the montmorillonite mineral, which macroscopically manifests as water absorption and swelling of the bentonite. The modified bentonite has a smaller interlayer spacing of montmorillonite and a reduced mineral expansion capacity, which improves its dispersion stability and interfacial compatibility in the UHPC system. The densest packing of inorganic particles and thixotropic control achieve "clay-like" rheological properties, thereby significantly improving the clay-like plasticity and workability of the UHPC slurry. At the same time, the surface charge characteristics of the modified bentonite are optimized, which further enhances its interfacial bonding strength with cement hydration products and reinforcing fibers.

[0010] As a preferred technical solution, the gel material is made of silicate cement.

[0011] As a preferred technical solution, the aggregate is composed of two or more materials selected from ultrafine silica fume, ultrafine quartz powder, and fine sand. The particle size range of the ultrafine silica fume is between 0.1μm and 5μm; the particle size range of the ultrafine quartz powder is between 0.1μm and 5μm; and the particle size range of the fine sand is between 0.1mm and 0.5mm. The above materials are used to maintain the smoothness and plasticity of the green body.

[0012] As a preferred technical solution, the reinforcing fiber is PVA fiber or PP fiber. The length of the reinforcing fiber is 6mm-12mm. The main functions of the fiber are: resistance to bending and cracking, maintaining the stability of the blank shape, providing internal support similar to a "fiber mesh skeleton", avoiding the use of steel fibers, obtaining a smooth surface, and allowing for manual handling.

[0013] As a preferred technical solution, the admixtures include: polycarboxylate superplasticizer, viscosity modifier, retarder, and defoamer. Specifically, the weight ratio of polycarboxylate superplasticizer: viscosity modifier: retarder is 80-150:2-5:0.5-2. The polycarboxylate superplasticizer can effectively disperse cement particles, release encapsulated water, and improve the fluidity of the paste even at low water-cement ratios. The viscosity modifier is cellulose ether or guar gum, which can finely control the balance between yield stress and plastic viscosity, giving the material both self-leveling properties and anti-sag properties. The retarder is citrate / hydroxycarboxylic acid, where citrate and hydroxycarboxylic acid complex with Ca... 2+ The hydration induction period of C3A is delayed, and the initial setting time is precisely controlled to 60–90 minutes to ensure the shape stability of the clay-like slurry during the manual shaping window. The defoamer is an organosilicon-based agent that can directionally eliminate air bubbles trapped during stirring, reduce the porosity of the hardened body, and improve density and surface smoothness. The synergistic effect of the components ultimately achieves clay-level plasticity control of UHPC under vibration-free and pump-free conditions.

[0014] This invention also proposes a method for preparing UHPC with clay-like plasticity, comprising the following steps: A) Add the modified bentonite, gelling material, and aggregate to the mixer according to the specified ratio, and dry mix for 3 minutes until uniform; B) Add the reinforcing fiber and continue stirring for 2 minutes to disperse the reinforcing fiber; C) Dissolve polycarboxylate superplasticizer, viscosity modifier, retarder, and defoamer in metered water, slowly add to the mixer, and control the total mixing time to 8-10 minutes to obtain clay-like blank. D) After the clay-like blank is placed in a roller press and subjected to multiple "folding-calendering-vacuum extrusion molding", the UHPC blank is obtained.

[0015] As a preferred technical solution, the "folding-calendering" process is performed 1-8 times.

[0016] As a preferred technical solution, the modification method of the modified bentonite includes the following steps: Step 1: Dissolve sodium polyacrylate in deionized water to obtain a sodium polyacrylate solution; Step 2: Add dry calcium-based bentonite to the sodium polyacrylate solution and continue stirring to form PAAS-CaB slurry; Step 3: Dry the PAAS-CaB slurry in an oven, grind it, and sieve it to obtain modified bentonite.

[0017] The present invention has the following beneficial effects: (1) By constructing a three-dimensional network structure through the synergistic effect of modified bentonite and gel material, the yield stress and thixotropy of the slurry are significantly improved, so that the clay-like UHPC can maintain its shape when it is static and flow rapidly when it is sheared. It can be bent, modified and shaped into standard UHPC workpieces using a preset model; (2) PVA / PP fiber and modified bentonite together enhance the density of the interface transition zone, reduce the probability of microcrack initiation, and improve the structural stress and toughness of the product; (3) The admixture system and modified bentonite produce multiple adsorption effects of ions-polymer-clay, further delaying the hydration exothermic peak and widening the shaping time window to more than 90 minutes, meeting the needs of integrated molding of complex curved surface hand sculptures and thin-walled components. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a diagram showing the changes in the modified bentonite of the present invention. Detailed Implementation

[0020] The technical solutions of the embodiments of the invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the invention.

[0021] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "top", "middle", "inner", etc., which indicate orientation or positional relationship, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the invention.

[0022] The present invention provides a UHPC with clay-like plasticity, comprising the following components by weight percentage: 140-160 parts of gel material; 140-160 parts aggregate; 20-35 parts modified bentonite; 3-6 parts reinforcing fiber; 1-2.5 parts of admixture.

[0023] The modified bentonite is calcium-based bentonite modified with sodium polyacrylate. The modification method for the modified bentonite is as follows: Step 1: Dissolve sodium polyacrylate in deionized water to obtain a sodium polyacrylate solution; Step 2: Add dry calcium-based bentonite to the sodium polyacrylate solution and continue stirring to form PAAS-CaB slurry; Step 3: Dry the PAAS-CaB slurry in an oven, grind it, and sieve it to obtain modified bentonite.

[0024] Specifically, the modified bentonite contains 2%-8% sodium polyacrylate. As a highly absorbent resin, sodium polyacrylate contains numerous hydrophilic groups and a three-dimensional cross-linked spatial network structure. Upon contact with water, ionization increases the concentration of cations within the network, and the osmotic pressure created by the concentration difference causes water molecules to penetrate inward, resulting in polymer expansion. Calcium-based bentonite is a natural clay mineral with montmorillonite (85-90%) as its core component. Its main chemical composition is SiO2 (50.95-61.74%), Al2O3 (16.08-16.54%), and CaO (2.26-5.01%). This mineral is white or grayish-white, and when containing impurities, it exhibits grayish-green or light blue hues. It has the characteristic of swelling upon contact with water (increasing in volume 20-30 times). The water absorption, swelling, and low permeability characteristics of calcium-based bentonite mainly originate from the hydrophilic clay mineral montmorillonite. Due to the weak intermolecular forces between the layers of lamellar montmorillonite, water molecules easily penetrate the interlayer space, increasing the interlayer spacing and causing the montmorillonite mineral to expand in volume. Macroscopically, this manifests as water absorption and swelling of the bentonite. Modified bentonite exhibits reduced interlayer spacing of montmorillonite, decreasing its swelling capacity and improving its dispersion stability and interfacial compatibility in the UHPC system. This significantly enhances the clay-like plasticity and workability of the UHPC slurry. Simultaneously, the optimized surface charge characteristics of the modified bentonite further strengthen its interfacial bonding strength with cement hydration products and reinforcing fibers.

[0025] The gel material of this invention is silicate cement. The aggregate is a mixture of two or more materials selected from ultrafine silica fume, ultrafine quartz powder, and fine sand. The particle size of the ultrafine silica fume ranges from 0.1 μm to 5 μm; the particle size of the ultrafine quartz powder ranges from 0.1 μm to 5 μm; and the particle size of the fine sand ranges from 0.1 mm to 0.5 mm. The combination of the gel material and the aggregate helps to achieve a clay-like lubrication-support dual structure at low moisture content, thereby maintaining the smoothness and plasticity of the green body.

[0026] The reinforcing fiber of this invention is PVA fiber or PP fiber. The length of the reinforcing fiber is 6mm-12mm. The main functions of the fiber are: flexural strength, crack resistance, maintaining the stability of the preform shape, providing internal support similar to a "fiber mesh skeleton", avoiding the use of steel fibers, obtaining a smooth surface, and allowing for manual handling.

[0027] The admixtures of this invention include: polycarboxylate superplasticizer, viscosity modifier, retarder, and defoamer. The weight ratio of polycarboxylate superplasticizer:viscosity modifier:retarder is 80-150:2-5:0.5-2. The polycarboxylate superplasticizer can effectively disperse cement particles, release encapsulated water, and improve the fluidity of the paste even at low water-cement ratios. The viscosity modifier is cellulose ether or guar gum, which can finely control the balance between yield stress and plastic viscosity, giving the material both self-leveling properties and anti-sag properties. The retarder is citrate / hydroxycarboxylic acid, where citrate and hydroxycarboxylic acid complex with Ca... 2+ The hydration induction period of C3A is delayed, and the initial setting time is precisely controlled to 60–90 minutes to ensure the shape stability of the clay-like slurry during the manual shaping window. The defoamer is an organosilicon-based agent that can directionally eliminate air bubbles trapped during stirring, reduce the porosity of the hardened body, and improve density and surface smoothness. The synergistic effect of the components ultimately achieves clay-level plasticity control of UHPC under vibration-free and pump-free conditions.

[0028] The calcium-based bentonite used in the experiments of this invention were all produced in Enshi, Hubei Province. Sodium polyacrylate was a white granular solid, analytical grade (AR), purchased from Tianjin Kemei Chemical Reagent Co., Ltd., with a relative density of 1.23 and an aqueous solution that was weakly alkaline.

[0029] The specific process of modifying bentonite according to this invention is as follows: Taking calcium-based bentonite with a 4% sodium polyacrylate content as an example, 5000 mL of deionized water is placed in a beaker, heated to the reaction temperature (50°C), and maintained at this temperature until the reaction is complete. Then, 25 g of sodium polyacrylate (4% of 625 g of calcium-based bentonite) is added, and the mixture is stirred at high speed for about 30 minutes to form a uniform modifier solution. Next, 625 g of dried calcium-based bentonite (with a deionized water ratio of 1:8) is slowly added to the solution in portions, and stirring is continued until the specified reaction time (90 minutes) is reached to form a PAAS-CaB slurry. Finally, the slurry is dried in an oven at 105°C for 24 hours, ground through a 75 μm (200 mesh) sieve, and the modified bentonite is obtained.

[0030] Reference Figure 1As shown, the changes in bentonite before and after modification are as follows: the modified bentonite has a smaller interlayer spacing of montmorillonite crystals and a lower mineral expansion capacity, which improves its dispersion stability and interfacial compatibility in the UHPC system, thereby significantly improving the clay-like plasticity and workability of the UHPC slurry; at the same time, the surface charge characteristics of the modified bentonite are optimized, which further enhances its interfacial bonding strength with cement hydration products and reinforcing fibers.

[0031] This invention also proposes a method for preparing UHPC with clay-like plasticity, comprising the following steps: A) Add the modified bentonite, gelling material, and aggregate to the mixer according to the specified ratio, and dry mix for 3 minutes until uniform; B) Add the reinforcing fiber and continue stirring for 2 minutes to disperse the reinforcing fiber; C) Dissolve polycarboxylate superplasticizer, viscosity modifier, retarder, and defoamer in metered water, slowly add to the mixer, and control the total mixing time to 8-10 minutes to obtain clay-like blank. D) After the clay-like blank is placed in a roller press and subjected to multiple "folding-calendering-vacuum extrusion molding", the UHPC blank is obtained.

[0032] The UHPC blank is bent, modified, and shaped according to a preset model to form a standard UHPC workpiece, which is then steam cured and molded and cured according to national standards to obtain the product.

[0033] Example 1 The specific formula for Example 1 is as follows: 140 parts of PII 52.5 grade ordinary Portland cement; 160 parts of aggregate, wherein the ratio of ultrafine silica fume: ultrafine quartz powder: fine sand is 25:30:45; 35 parts of modified bentonite, of which sodium polyacrylate was added at a concentration of 4%; Three parts of reinforcing fiber, specifically PP fiber with a length of 6mm-12mm; Two parts of admixture, wherein the weight ratio of polycarboxylate superplasticizer, viscosity modifier and retarder is 100:5:1.

[0034] The UHPC blank is prepared according to the above scheme. The UHPC blank is then bent, modified, and shaped into a standard UHPC workpiece according to the preset model. It is then steam cured and molded and cured according to national standards to obtain the product.

[0035] Example 2 Unlike the formulation in Example 1, the specific formulation in Example 2 is as follows: 140 parts of PII 52.5 grade ordinary Portland cement; 160 parts of aggregate, wherein the ratio of ultrafine silica fume: ultrafine quartz powder: fine sand is 25:30:45; 30 parts of modified bentonite, wherein the content of sodium polyacrylate is 8%; Three parts of reinforcing fiber, specifically PP fiber with a length of 6mm-12mm; Two parts of admixture, wherein the weight ratio of polycarboxylate superplasticizer, viscosity modifier and retarder is 80:5:1.

[0036] The UHPC blank is prepared according to the above scheme. The UHPC blank is then bent, modified, and shaped into a standard UHPC workpiece according to the preset model. It is then steam cured and molded and cured according to national standards to obtain the product.

[0037] Example 3 Unlike the formulation in Example 1, the specific formulation in Example 3 is as follows: 160 parts of PII 52.5 grade ordinary Portland cement; 160 parts of aggregate, wherein the ratio of ultrafine silica fume: ultrafine quartz powder: fine sand is 25:30:45; 35 parts of modified bentonite, of which sodium polyacrylate was added at a concentration of 2%; Three parts of reinforcing fiber, specifically PVA fiber with a length of 6mm-12mm; Two parts of admixture, wherein the weight ratio of polycarboxylate superplasticizer, viscosity modifier and retarder is 80:5:1.

[0038] The UHPC blank is prepared according to the above scheme. The UHPC blank is then bent, modified, and shaped into a standard UHPC workpiece according to the preset model. It is then steam cured and molded and cured according to national standards to obtain the product.

[0039] Example 4 Unlike the formulation in Example 1, the specific formulation in Example 4 is as follows: 140 parts of PII 52.5 grade ordinary Portland cement; 160 parts of aggregate, wherein the ratio of ultrafine silica fume: ultrafine quartz powder: fine sand is 25:30:45; 20 parts of modified bentonite, of which sodium polyacrylate was added at a concentration of 4%; The reinforcing fiber consists of 6 parts, specifically PP fibers with a length of 6mm-12mm; Two parts of admixture, wherein the weight ratio of polycarboxylate superplasticizer, viscosity modifier and retarder is 150:2:1.

[0040] The UHPC blank is prepared according to the above scheme. The UHPC blank is then bent, modified, and shaped into a standard UHPC workpiece according to the preset model. It is then steam cured and molded and cured according to national standards to obtain the product.

[0041] Example 5 Unlike the formulation in Example 1, the specific formulation in Example 5 is as follows: 160 parts of PII 52.5 grade ordinary Portland cement; 140 parts of aggregate, wherein the ratio of ultrafine silica fume: ultrafine quartz powder: fine sand is 25:30:45; 30 parts of modified bentonite, of which the content of sodium polyacrylate is 4%; Three parts of reinforcing fiber, specifically PP fiber with a length of 6mm-12mm; Two parts of admixture, wherein the weight ratio of polycarboxylate superplasticizer, viscosity modifier and retarder is 120:2:1.

[0042] The UHPC blank is prepared according to the above scheme. The UHPC blank is then bent, modified, and shaped into a standard UHPC workpiece according to the preset model. It is then steam cured and molded and cured according to national standards to obtain the product.

[0043] Specific comparison results: ; Summary of Results: Example 1 demonstrates the best overall performance balance, balancing ease of construction and final mechanical properties, particularly notable for its synergistic effect between thixotropy and the shaping window. The 95-minute working window ensures a high tolerance for process errors. Example 2, while exhibiting strong thixotropy, suffers from compressed shaping time, resulting in slightly limited operation. Example 3 offers ample stretch but insufficient structural stability, making it prone to collapse and deformation in large-sized components. Example 4 significantly enhances toughness through the introduction of PVA fibers, achieving a "ramen-like" stretchability through high PVA fiber content, making it suitable for ultra-thin-walled components. Example 5, using PP fibers as the core reinforcement, significantly improves impact resistance and durability while maintaining excellent workability. The fibers are evenly dispersed, with strong interfacial bonding and a smooth surface, making it suitable for high-end decorative UHPC components.

[0044] The present invention has the following beneficial effects: (1) By constructing a three-dimensional gel grid structure in synergy with modified bentonite and gel materials, the yield stress and thixotropy of the slurry are significantly improved, so that the clay-like UHPC can maintain its shape when it is static and flow rapidly when it is sheared; (2) PVA / PP fibers and modified bentonite together enhance the density of the interface transition zone and reduce the probability of microcrack initiation; (3) The additive system and modified bentonite produce multiple adsorption effects of ions-polymer-clay, which further delays the hydration exothermic peak and widens the shaping time window to more than 90 minutes, meeting the needs of integrated molding of complex curved surface hand sculptures and thin-walled components, and improving the production efficiency.

[0045] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0046] The preferred embodiments of the invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A UHPC with clay-like plasticity, characterized in that, Includes the following components by weight percentage: 140-160 parts of gel material; 140-160 parts aggregate; 20-35 parts modified bentonite; 3-6 parts reinforcing fiber; 1-2.5 parts of admixture; The modified bentonite is calcium-based bentonite modified with sodium polyacrylate.

2. The UHPC with clay-like plasticity according to claim 1, characterized in that, The modification method of the modified bentonite is as follows: Step 1: Dissolve sodium polyacrylate in deionized water to obtain a sodium polyacrylate solution; Step 2: Add dry calcium-based bentonite to the sodium polyacrylate solution and continue stirring to form PAAS-CaB slurry; Step 3: Dry the PAAS-CaB slurry in an oven, grind it, and sieve it to obtain modified bentonite.

3. The UHPC with clay-like plasticity according to claim 1, characterized in that, The modified bentonite contains 2%-8% sodium polyacrylate.

4. The UHPC with clay-like plasticity according to claim 1, characterized in that, The aggregate is a mixture of two or more materials selected from ultrafine silica fume, ultrafine quartz powder, and fine sand.

5. A UHPC with clay-like plasticity according to claim 4, characterized in that, The particle size range of the ultrafine silica fume is between 0.1μm and 5μm; the particle size range of the ultrafine quartz powder is between 0.1μm and 5μm; and the particle size range of the fine sand is between 0.1mm and 0.5mm.

6. The UHPC with clay-like plasticity according to claim 1, characterized in that, The reinforcing fiber is PVA fiber or PP fiber, and the length of the reinforcing fiber is 6mm-12mm.

7. The UHPC with clay-like plasticity according to claim 1, characterized in that, The admixtures include: polycarboxylate superplasticizer, viscosity modifier, and retarder, wherein the weight ratio of polycarboxylate superplasticizer: viscosity modifier: retarder is 80-150:2-5:0.5-2.

8. A method for preparing UHPC with clay-like plasticity, characterized in that, Includes the following steps: A) Add the modified bentonite, gelling material, and aggregate to the mixer according to the specified ratio, and dry mix for 3 minutes until uniform; B) Add the reinforcing fiber and continue stirring for 2 minutes to disperse the reinforcing fiber; C) Dissolve polycarboxylate superplasticizer, viscosity modifier, and retarder in metered water, slowly add to the mixer, and control the total mixing time to 8-10 minutes to obtain clay-like blank. D) After the clay-like blank is placed in a roller press and repeatedly "folded-calendered-vacuum extruded", the UHPC blank is obtained.

9. The method for preparing UHPC with clay-like plasticity according to claim 8, characterized in that, The "folding-calendering" process is performed 1-8 times.

10. The method for preparing UHPC with clay-like plasticity according to claim 8, characterized in that, The modification method of the modified bentonite includes the following steps: Step 1: Dissolve sodium polyacrylate in deionized water to obtain a sodium polyacrylate solution; Step 2: Add dry calcium-based bentonite to the sodium polyacrylate solution and continue stirring to form PAAS-CaB slurry; Step 3: Dry the PAAS-CaB slurry in an oven, grind it, and sieve it to obtain modified bentonite.

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