Anti-penetration C60 concrete mixing proportion and preparation method

Abstract

The application discloses an anti-penetration C60 concrete mixing proportion and a preparation method, and belongs to the technical field of special building materials and protective engineering. The mixing proportion is composed of the following components in parts by mass: 380 parts of Portland cement, 30 parts of fly ash, 30 parts of sulphoaluminate cement, 10 parts of expanding agent, 550 parts of sand, 2.5 parts of water reducing agent and 0.2 parts of defoaming agent. The preparation method comprises the following steps: dry mixing the powders and sand, wet mixing and plasticizing by adding mixing water in which the water reducing agent and the defoaming agent are pre-dissolved, forming by pouring, vibrating and exhausting, and static stopping; the temperature is increased to 60-65 DEG C at a rate of not more than 10 DEG C / h, and the concrete is kept at constant temperature for 168 hours under the condition that the relative humidity is not less than 95%, and then the temperature is decreased and the concrete is demolded. The anti-penetration capacity of the concrete is remarkably improved through the synergistic effect of the homogeneous framework without coarse aggregate, the micro-pre-stress of the ternary cementing system, the targeted deaeration of the defoaming agent and the long-period steam curing.

Description

Technical Field

[0001] This invention belongs to the field of special building materials and protective engineering technology, specifically relating to a mix proportion and preparation method of penetration-resistant C60 concrete. Background Technology

[0002] With the rapid development of high-tech weaponry such as bunker-buster and armor-piercing projectiles, the structural protection of critical infrastructure such as military defense projects, underground command posts, and nuclear power plant containment structures faces severe challenges. Protective structural materials not only need to withstand enormous static loads but also need to resist high-strain-rate dynamic impacts and the penetration damage of high-speed penetrators. High-strength concrete is widely used in protective engineering. However, conventionally configured high-strength concrete in existing technologies generally suffers from the following defects: First, it heavily relies on coarse aggregates, resulting in numerous fragile interface transition zones within the material. Under strong dynamic impact, stress waves are reflected and refracted at these interfaces, easily leading to stress concentration and microcrack networks, causing brittle disintegration and penetration damage. Second, to achieve high strength, extremely low water-cement ratios and large amounts of polycarboxylate superplasticizers are typically used. Superplasticizers reduce the surface tension of the liquid, entraining numerous tiny, difficult-to-remove closed air bubbles during mixing. These bubbles become pore defects under the action of high-energy shock waves, reducing the effective density of the matrix and its penetration resistance. Third, high-strength silicate cement systems exhibit strong chemical shrinkage and self-drying shrinkage during hardening, resulting in pre-existing tensile stress within the concrete. Due to the concrete's weak tensile strength, when subjected to reflected tensile waves generated by projectile penetration, the back of the target plate is highly susceptible to large-scale collapse damage. Fourth, existing precast concrete often employs short-cycle steam curing of 1 to 2 days to achieve early strength. Short-cycle steam curing cannot deeply activate the pozzolanic activity of auxiliary cementitious materials such as fly ash, and high temperatures can easily alter the microscopic phase equilibrium, creating a hidden danger of delayed ettringite formation leading to later strength reduction and cracking.

[0003] Therefore, providing a concrete mix design and preparation method that is highly homogeneous in microstructure, has low porosity, possesses tensile prestress, and can maximize the dissipation of projectile kinetic energy has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0004] The technical problem this invention aims to solve is as follows: Existing high-strength concrete heavily relies on coarse aggregates, resulting in numerous fragile interfacial transition zones. Under strong dynamic load impact, stress waves are reflected and refracted at the interfaces, leading to stress concentration and microcrack networks, causing brittle disintegration and penetrating failure of the material. To achieve high strength, a large amount of polycarboxylate superplasticizer is used. The superplasticizer reduces the surface tension of the liquid, and during the mixing process, a large number of tiny closed air bubbles are entrained, becoming pore defects that reduce penetration resistance. High-strength silicate cement systems exhibit strong chemical shrinkage and self-drying shrinkage during hardening, causing pre-existing tensile stress within the concrete. When subjected to projectile penetration and the generation of reflected tensile waves, the back of the target plate is prone to large-area collapse failure. Existing precast concrete uses short-cycle steam curing of 1 to 2 days, which cannot deeply activate the pozzolanic activity of fly ash and easily creates hidden dangers that delay the formation of ettringite.

[0005] To solve the above-mentioned technical problems, the present invention provides a C60 concrete mix proportion that is resistant to penetration, which consists of the following components by mass: 380 parts of silicate cement, 30 parts of fly ash, 30 parts of sulfoaluminate cement, 10 parts of expansion agent, 550 parts of sand, 2.5 parts of water-reducing agent, and 0.2 parts of defoamer.

[0006] Furthermore, the silicate cement is ordinary silicate cement with a strength grade of not less than 52.5; the fly ash is Grade I fly ash; and the sulfoaluminate cement is rapid-hardening sulfoaluminate cement with a specific surface area of ​​not less than 400 m² / kg.

[0007] Furthermore, the expanding agent is a calcium sulfoaluminate expanding agent or a calcium oxide-magnesium oxide composite expanding agent; the sand is quartz sand or river sand with a fineness modulus between 2.0 and 2.6 and a maximum particle size not exceeding 2.5 mm.

[0008] Furthermore, the water-reducing agent is a polycarboxylate-based high-performance water-reducing agent with a water reduction rate greater than 25%; the defoamer is selected from polysiloxane defoamers or polyether-based surfactant defoamers.

[0009] This invention also provides a method for preparing penetration-resistant C60 concrete, comprising the following steps: Step S100, adding 380 parts of silicate cement, 30 parts of fly ash, 30 parts of sulfoaluminate cement, 10 parts of expansion agent, and 550 parts of sand to a mixer for dry mixing to obtain anhydrous solid powder; Step S200, dissolving 2.5 parts of water-reducing agent and 0.2 parts of defoamer in mixing water beforehand, adding them to the anhydrous solid powder obtained in step S100, and continuously wet mixing to obtain a slurry. Material; Step S300, pour the slurry obtained in step S200 into the mold, vibrate to degas and form, and then let it stand still; Step S400, move the molded component after standing still in step S300 into the steam curing chamber, and heat it to 60℃ to 65℃ at a rate not exceeding 10℃ / h; Step S500, maintain the temperature reached in step S400 for constant temperature curing for 168 hours under the condition that the relative humidity is not lower than 95%, and demold after curing to obtain penetration resistant C60 concrete.

[0010] Further, step S100 includes: step S110, putting each powder component and sand into a forced mixer; step S120, performing dry mixing and stirring for 2 to 3 minutes.

[0011] Further, step S200 includes: step S210, dissolving 2.5 parts of water-reducing agent and 0.2 parts of defoamer in mixing water beforehand to obtain a mixture; step S220, adding the mixture at a uniform rate to the anhydrous solid powder obtained in step S100, continuously wet mixing for 4 to 6 minutes, and controlling the water-cement ratio between 0.18 and 0.22.

[0012] Further, step S300 includes: step S310, pouring the slurry obtained in step S200 into the mold; step S320, placing the mold on a high-frequency vibration table for vibration to vent and form, with a vibration time of 60 to 120 seconds; step S330, after vibration, keeping the mold still for 4 to 6 hours, and covering the surface with a film to prevent moisture evaporation.

[0013] Further, step S400 includes: step S410, moving the molded component after static curing in step S300 into the steam curing chamber; step S420, raising the room temperature to 60°C to 65°C at a heating rate not exceeding 10°C / h.

[0014] Further, step S500 includes: step S510, maintaining the temperature reached in step S400 for constant temperature curing for 168 hours under saturated steam conditions with a relative humidity of not less than 95%; step S520, after curing, demolding after cooling to room temperature at a rate not exceeding 15℃ / h to obtain penetration-resistant C60 concrete.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] (1) By completely discarding coarse aggregate and replacing it with fine-grained sand with a fineness modulus between 2.0 and 2.6 and a maximum particle size not exceeding 2.5 mm, the interfacial transition zone between coarse aggregate and cement paste in traditional concrete is eliminated. During stress wave propagation, the material exhibits high homogeneity, with no obvious weak points during projectile penetration. It can only advance by shearing and breaking the homogeneous matrix, greatly improving the conversion and dissipation rate of projectile kinetic energy into thermal energy and plastic deformation energy, and significantly reducing the penetration depth.

[0017] (2) By using silicate cement, sulfoaluminate cement and expansion agent to form a ternary cementitious system, sulfoaluminate cement and expansion agent generate controllable micro-expansion strain during the hardening process. Under the constraint of the fine sand skeleton, it is transformed into micro-pre-compression stress on the matrix, which actively offsets the tensile stress generated by the reflected tensile wave when the projectile penetrates. This effectively suppresses the large-area collapse damage on the back of the target plate and overcomes the defects of traditional high-strength concrete, which has internal pre-existing tensile stress due to chemical shrinkage and self-drying shrinkage, and is prone to delamination and collapse on the back after impact.

[0018] (3) By introducing defoamer, the closed air bubbles introduced by polycarboxylate superplasticizer during the mixing process are targeted to be broken, so that the air content of the molded component is close to the theoretical minimum value, eliminating the stress concentration hidden danger caused by air pores, and significantly improving the apparent density and penetration resistance of the matrix.

[0019] (4) By adopting a long-cycle steam curing process of up to 168 hours, the pozzolanic activity of fly ash is deeply activated, allowing it to undergo a full secondary hydration reaction with calcium hydroxide in the system, generating a large amount of high-strength secondary gel, filling the micropores of the matrix, and improving the density. At the same time, in conjunction with the regulation of the sulfur-aluminum phase and the alkali consumption effect of the system itself, the drawback of delayed ettringite formation that is easily caused by traditional high-temperature steam curing is completely blocked, so that the material can maintain its penetration resistance limit performance while possessing long-term durability.

[0020] The present invention will now be further described with reference to the accompanying drawings. Attached Figure Description

[0021] Figure 1 This is a schematic flowchart of the method for preparing penetration-resistant C60 concrete in an embodiment of the present invention.

[0022] Figure 2 This is a schematic diagram showing the mass proportions of each component in the penetration-resistant C60 concrete in an embodiment of the present invention. Detailed Implementation

[0023] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0024] This invention provides a mix proportion and preparation method for penetration-resistant C60 concrete. This mix proportion completely eliminates coarse aggregate, using fine-grained sand as the skeleton, and employs silicate cement, fly ash, sulfoaluminate cement, and an expansive agent to form a composite cementitious system. An antifoaming agent is used to target and eliminate closed air bubbles introduced by the water-reducing agent, and long-cycle steam curing deeply activates the pozzolanic activity of the fly ash, forming a micro-prestress network within the matrix. This gives the concrete excellent resistance to high-speed kinetic energy impact and penetration.

[0025] For the proportions and functions of each component, refer to Figure 2 The anti-penetration C60 concrete mix proportion of the present invention, by mass parts, consists of the following components: 380 parts silicate cement, 30 parts fly ash, 30 parts sulfoaluminate cement, 10 parts expansion agent, 550 parts sand, 2.5 parts water-reducing agent, and 0.2 parts defoamer.

[0026] The functions of each component are as follows: Silicate cement, as the main cementing material, provides the basic strength of the concrete. The fly ash is Class I fly ash, which undergoes a deep pozzolanic reaction under long-term steam curing conditions, consuming the brittle and easily soluble calcium hydroxide in the system to generate a high-strength secondary gel that fills the micropores inside the matrix, increasing density. Sulfoaluminate cement has rapid hardening, early strength, and micro-expansion characteristics, working synergistically with the expansive agent to generate controllable micro-expansion strain during hardening. The expansive agent is a calcium sulfoaluminate-based expansive agent or a calcium oxide-magnesium oxide composite expansive agent. Under the constraint of a fine sand skeleton, it converts the micro-expansion strain into micro-pre-compression stress on the matrix, actively offsetting the tensile stress generated by the reflected tensile wave during projectile penetration, and inhibiting the collapse damage on the back of the target plate. The sand is quartz sand or river sand with a fineness modulus between 2.0 and 2.6 and a maximum particle size not exceeding 2.5 mm, completely replacing coarse aggregate, eliminating the interfacial transition zone, and making the material exhibit high homogeneity during stress wave propagation. The water-reducing agent is a high-performance polycarboxylate-based water-reducing agent with a water reduction rate greater than 25%. It is used to reduce the water-cement ratio and ensure good fluidity of the slurry under low water consumption conditions. The defoamer is selected from polysiloxane defoamers or polyether-based surfactant defoamers. It is used to target and break the closed air bubbles introduced by the water-reducing agent during the mixing process, reduce the air content of the molded components, and eliminate the stress concentration hazards caused by air pores.

[0027] Preparation method, refer to Figure 1 The method for preparing penetration-resistant C60 concrete of the present invention includes the following steps.

[0028] Step S100, dry mixing. This includes: Step S110, adding 380 parts of silicate cement, 30 parts of fly ash, 30 parts of sulfoaluminate cement, 10 parts of expansion agent, and 550 parts of sand into a forced concrete mixer; Step S120, dry mixing for 2 to 3 minutes until the powder fully coats the fine sand, forming a uniform anhydrous solid powder.

[0029] Step S200, targeted degassing and plasticizing mixing. This includes: Step S210, completely dissolving 2.5 parts of water-reducing agent and 0.2 parts of defoamer in mixing water to prepare a mixture; Step S220, uniformly adding the mixture to the anhydrous solid powder obtained in Step S100, and continuously wet mixing for 4 to 6 minutes to obtain a slurry without coarse aggregate. During wet mixing, the defoamer targets the closed air bubbles introduced by the water-reducing agent, causing the bubbles to break and overflow onto the slurry surface. The water-cement ratio is controlled between 0.18 and 0.22 based on the powder fineness and sand moisture content.

[0030] Step S300, high-frequency compaction molding. This includes: Step S310, pouring the slurry obtained in Step S200 into the mold; Step S320, placing the mold on a high-frequency vibration table for vibration and degassing molding, with a vibration time of 60 to 120 seconds, so that the bubbles broken by the defoamer can fully overflow the surface; Step S330, after vibration, allowing the mold to stand still for 4 to 6 hours, and covering the surface with a film to prevent moisture evaporation.

[0031] Step S400, heating stage. Includes: Step S410, moving the molded component after static curing in Step S300 into the steam curing chamber; Step S420, raising the room temperature to 60°C to 65°C at a heating rate not exceeding 10°C / h.

[0032] Step S500, Constant Temperature Curing Stage. This includes: Step S510, maintaining the temperature reached in Step S400 for 168 hours under saturated steam conditions with a relative humidity of not less than 95%. Long-term steam curing deeply activates the pozzolanic activity of fly ash, causing it to undergo a full secondary hydration reaction with calcium hydroxide in the system, generating a large amount of high-strength secondary gel that fills the micropores of the matrix, significantly improving density. Sulfoaluminate cement and the expansive agent continuously generate micro-expansion reactions under long-term humid and hot conditions, forming a stable micro-prestress network under the constraint of the fine sand skeleton. Step S520, Demolding after curing yields penetration-resistant C60 concrete. The ultra-long-term steam curing, combined with the system's own regulation of the sulfoaluminate phase and alkali-consuming effect, completely eliminates the drawback of delayed ettringite formation that is easily caused by traditional high-temperature steam curing, enabling the material to maintain its penetration resistance limit while possessing long-term durability.

[0033] Examples and comparative examples: The technical effects of the present invention will be explained below through examples and comparative examples.

[0034] Example 1: This example uses the mix proportions and preparation method described in this invention. The component proportions are as follows: 380 kg of ordinary 52.5 grade silicate cement, 30 kg of grade I low-calcium fly ash, 30 kg of rapid-hardening sulfoaluminate cement, 10 kg of calcium sulfoaluminate expansive agent, 550 kg of refined quartz sand with a fineness modulus of 2.2, 2.5 kg of polycarboxylate-based high-performance water-reducing agent with a water reduction rate of 28%, 0.2 kg of polysiloxane-based high-efficiency defoamer, and 88 kg of mixing pure water, with a calculated water-cement ratio of 0.195. Preparation process: The cement, fly ash, sulfoaluminate cement, expansive agent, and quartz sand are poured into a forced mixer and dry-mixed for 3 minutes. The water-reducing agent and defoamer are fully dissolved in 88 kg of water and then added to the dry materials for continuous wet mixing for 5 minutes. The slurry is poured into a mold and vibrated on a high-frequency vibrating table for 90 seconds until the surface is smooth. It is then covered with a film and left to stand at room temperature for 5 hours. The mold, along with the mold, is placed into a steam curing chamber, where the temperature is increased to 62°C at a rate of 10°C / h, and saturated humidity (greater than 95%) is maintained for 168 hours. The temperature is then gradually reduced to room temperature at a rate not exceeding 15°C / h before demolding.

[0035] Comparative Example 2 examines the effect of conventional periodic curing on performance. The mix proportions and dry-wet mixing process are the same as in Example 1, except for the curing regime: after the components are heated to 62°C in the steam curing chamber, they are subjected to conventional 48-hour constant temperature steam curing, and then cooled, demolded, and placed in a normal temperature natural environment.

[0036] Comparative Example 3 investigated the effect of the absence of a defoamer on performance. The formulation was the same as in Example 1, but 0.2 kg of polysiloxane-based high-efficiency defoamer was omitted, and only 2.5 kg of polycarboxylate superplasticizer was used. The preparation process was the same as in Example 1, with steam curing lasting 168 hours.

[0037] Comparative Example 4 investigated the effect of the absence of a ternary cementitious system on performance. Mix proportion: The 30 kg of sulfoaluminate cement and 10 kg of expansive agent from Example 1 were removed and replaced with an equal amount of ordinary 52.5 grade silicate cement, resulting in a total silicate cement volume of 420 kg. Other components remained unchanged. The preparation process was the same as in Example 1, still involving steam curing for up to 7 days.

[0038] Comparative Example 5: This comparative example uses traditional C60 high-strength aggregate concrete. The mix proportions are: 450 kg ordinary 52.5 strength silicate cement, 50 kg fly ash, 650 kg natural medium sand, 1100 kg continuously graded crushed stone (particle size 5 to 20 mm), 5 kg polycarboxylate superplasticizer, and 150 kg water. It contains no sulfoaluminate cement, no expanding agent, no defoamer, and a large amount of coarse aggregate. The process is normal vibration casting, and standard curing in a normal temperature curing room (temperature 20℃, humidity above 95%) for 28 days.

[0039] Performance testing involved high-speed impact penetration tests on the target plate samples prepared in the five embodiments and comparative examples above. The target plate dimensions were 600mm × 600mm × 300mm. Armor-piercing projectiles with a caliber of 14.5mm were used, with the impact velocity uniformly controlled at 850m / s. The projectile tip was perpendicularly aimed at the center of the target plate for penetration. The penetration depth of the crater and the maximum diameter and condition of the collapsed and spalled surface on the back of the target plate were recorded. The test results are as follows:

[0040] In Example 1, the penetration depth was 58 mm. No macroscopic collapse or through cracks were observed on the back of the target plate, while the projectile showed severe deformation and upsetting. This indicates that the formulation exhibits excellent stress confinement effect.

[0041] In Comparative Example 2, the penetration depth was 76 mm, and a network of microcracks and small fragments peeled off the back of the target plate. This indicates that the fly ash was not sufficiently thermally activated, resulting in defects in the target structure.

[0042] In Comparative Example 3, the penetration depth was 92 mm, and shallow collapse occurred on the back of the target plate, with a spalling surface diameter of approximately 8 cm. This indicates that after being subjected to stress, numerous closed pores inside led to the cracking.

[0043] In Comparative Example 4, the penetration depth was 85 mm, and a moderate-scale collapse (approximately 15 cm in diameter) occurred on the back of the target plate, resulting in radial cracks. This indicates that the lack of sulfoaluminate cement and expansion agent led to a lack of self-prestressed network within the matrix, resulting in delamination failure under the action of impact tensile waves.

[0044] In Comparative Example 5, with a penetration depth of 155 mm, the target plate exhibited a large-area funnel-shaped collapse and detachment, with a spalling surface diameter of approximately 35 cm. The coarse aggregate was crushed and detached at high speed. This indicates that the material has extremely weak tensile strength.

[0045] Test conclusion: Example 1, which fully follows the mix proportion and long-cycle steam curing preparation process of the present invention, keeps the penetration depth within 60mm and suppresses and eliminates the situation of back-side delamination and collapse, thus confirming the technical effect of the present invention in eliminating the unevenness of the aggregate medium and reducing the porosity.

[0046] It is particularly important to note that the 168-hour constant-temperature steam curing time used in this invention is a key process parameter verified through systematic comparative experiments. A comparison of Example 2 (48-hour curing) and Example 1 (168-hour curing) shows that, under identical mix proportions, simply extending the curing time from the conventional 48 hours to 168 hours significantly reduced the penetration depth from 76 mm to 58 mm, a reduction of 23.7%. Furthermore, the back-side collapse condition improved from "micro-crack network and small fragment spalling" to "no macroscopic collapse and no through cracks." This fully demonstrates that the 168-hour long-cycle curing is not simply an extension of working hours, but rather a necessary duration to ensure the deep activation of fly ash pozzolanic activity and the full development of the micro-expansion effect of sulfoaluminate cement and the expansive agent. This critical time was obtained through extensive comparative penetration experiments and has irreplaceable technical significance. Based on this, the present invention simultaneously achieves the following comprehensive advantages: First, long-term curing allows the secondary hydration reaction of fly ash to become more complete, and the large amount of secondary gel generated effectively fills the micropores of the matrix, further improving the density and compressive strength of the concrete; Second, the fully developed micro-expansion strain forms a stable and uniformly distributed micro-prestress network under the constraint of the fine sand skeleton, providing a reliable structural prestress reserve to resist impact tensile waves; Third, the full reaction and alkali consumption of the sulfur-aluminum phase in the system effectively avoids the risk of later strength reduction and cracking caused by the delayed formation of ettringite after traditional short-term steam curing, giving the material excellent long-term durability. Therefore, the 168-hour curing time is the core technological guarantee for the leap in penetration resistance achieved by the present invention.

[0047] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural modifications made based on the concept of the present invention and the content of this specification, or any direct or indirect applications in other related technical fields, are included within the scope of patent protection of the present invention.

Claims

1. A mix proportion for penetration-resistant C60 concrete, characterized in that, By weight, it consists of the following components: 380 parts silicate cement, 30 parts fly ash, 30 parts sulfoaluminate cement, 10 parts expansion agent, 550 parts sand, 2.5 parts water-reducing agent, and 0.2 parts defoamer.

2. The resistant C60 concrete mix design according to claim 1, characterized in that, The silicate cement is ordinary silicate cement with a strength grade of not less than 52.5; The fly ash is classified as Class I fly ash. Sulfoaluminate cement is a rapid-hardening sulfoaluminate cement with a specific surface area of ​​not less than 400 m² / kg.

3. The resistant C60 concrete mix design according to claim 1, characterized in that, The expanding agent is a calcium sulfoaluminate expanding agent or a calcium oxide-magnesium oxide composite expanding agent; The sand is quartz sand or river sand with a fineness modulus between 2.0 and 2.6 and a maximum particle size not exceeding 2.5 mm.

4. The resistant C60 concrete mix design according to claim 1, characterized in that, The water-reducing agent is a polycarboxylate-based high-performance water-reducing agent with a water reduction rate greater than 25%; The defoamer is selected from polysiloxane defoamers or polyether surfactant defoamers.

5. A method for preparing penetration-resistant C60 concrete, characterized in that, Includes the following steps: Step S100: 380 parts of silicate cement, 30 parts of fly ash, 30 parts of sulfoaluminate cement, 10 parts of expansion agent and 550 parts of sand are put into a mixer for dry mixing to obtain anhydrous solid powder. In step S200, 2.5 parts of water-reducing agent and 0.2 parts of defoamer are dissolved in mixing water in advance, and then added to the anhydrous solid powder obtained in step S100 and continuously wet-mixed to obtain a slurry. Step S300: Pour the slurry obtained in step S200 into the mold, vibrate to remove air, and then let it stand still. Step S400: Move the molded component that has been statically stopped in step S300 into the steam curing chamber and heat it to 60°C to 65°C at a rate not exceeding 10°C / h. In step S500, under the condition that the relative humidity is not lower than 95%, the temperature reached in step S400 is maintained for constant temperature curing for 168 hours. After curing, the concrete is demolded to obtain penetration-resistant C60 concrete.

6. The method for preparing penetration-resistant C60 concrete according to claim 5, characterized in that, Step S100 includes: Step S110: Add each powder component and sand into a forced mixer; Step S120: Perform dry mixing and stirring for 2 to 3 minutes.

7. The method for preparing penetration-resistant C60 concrete according to claim 5, characterized in that, Step S200 includes: Step S210: Dissolve 2.5 parts of water-reducing agent and 0.2 parts of defoamer completely in the mixing water beforehand to obtain a mixture; In step S220, the mixture is added at a constant speed to the anhydrous solid powder obtained in step S100, and continuously wet-mixed for 4 to 6 minutes, controlling the water-cement ratio between 0.18 and 0.

22.

8. The method for preparing penetration-resistant C60 concrete according to claim 5, characterized in that, Step S300 includes: Step S310: Pour the slurry obtained in step S200 into the mold; Step S320: Place the mold on a high-frequency vibration table for vibration, air removal, and molding. The vibration time is 60 to 120 seconds. Step S330: After vibration, the mold is left to stand still for 4 to 6 hours, and the surface is covered with a film to prevent moisture evaporation.

9. The method for preparing penetration-resistant C60 concrete according to claim 5, characterized in that, Step S400 includes: Step S410: Move the molded component after static curing and initial setting in step S300 into the steam curing chamber; Step S420: Raise the room temperature to 60°C to 65°C at a heating rate not exceeding 10°C / h.

10. The method for preparing penetration-resistant C60 concrete according to claim 5, characterized in that, Step S500 includes: Step S510: Under saturated steam conditions with a relative humidity of not less than 95%, maintain the temperature reached in step S400 for constant temperature curing for 168 hours. Step S520: After curing, the concrete is demolded at a cooling rate not exceeding 15℃ / h to obtain penetration-resistant C60 concrete.

Images