Low-carbon graphene reinforced high-ductility concrete as well as preparation method and application thereof

Abstract

The invention discloses low-carbon graphene reinforced high-ductility concrete as well as a preparation method and application thereof. The concrete comprises a low-carbon cementing material, aggregate, an additive and reinforced fibers, and the low-carbon cementing material is prepared from steel slag powder, mineral powder, fly ash and silica fume; the low-carbon cementing material comprises the following components in percentage by mass: 20-40% of steel slag powder, 40-60% of mineral powder, 5-15% of fly ash and 3-8% of silica fume; the aggregate is quartz sand and accounts for 45-55% of the total mass of the dry material; the additive comprises an expanding agent accounting for 1%-3% of the total mass of the low-carbon cementing material, a water reducing agent accounting for 0.5%-1.2% of the total mass of the low-carbon cementing material, and a graphene reinforcing agent which is a water-soluble graphene oxide solution and accounts for 0.05%-0.15% of the total mass of the cementing mixed material. The environment-friendly performance, the technical performance and the economic benefit are highly synergetic.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of concrete, and particularly relates to a low-carbon graphene reinforced high-ductility concrete as well as a preparation method and application thereof. BACKGROUND

[0002] As a basic and widely used bearing tool in the logistics, warehousing and construction industries, the performance of the pallet directly affects the transportation efficiency, cargo safety and operating cost. The mainstream pallet types on the market currently include wooden pallets, steel pallets and plastic pallets, each of which has obvious limitations and deficiencies, and it is difficult to meet the high performance requirements while taking into account green environmental protection and economic feasibility.

[0003] The traditional wooden pallet has the advantages of low manufacturing cost and moderate weight, but its defects are also very prominent. First, the wooden pallet relies on natural wood, which consumes a lot of resources and restricts its sustainable development. Second, wood is prone to moisture absorption and rot, and is easily deformed in a humid environment, with a short service life. Third, the wooden pallet is prone to cracking and breaking under high-strength use, with poor reliability. In addition, burrs or debris may occur on the surface of the wooden pallet, posing a safety hazard to operators, and the pallet often needs to be fumigated during international transportation, increasing additional costs.

[0004] Although the steel pallet has excellent strength and durability and can withstand heavy load requirements under extreme working conditions, its cost is extremely high, with a unit price of more than 350 yuan, which is more than 10 times the price of green concrete pallets, seriously restricting its economic feasibility in large-scale use. In addition, the steel pallet is heavy and inconvenient to move, which puts a burden on labor and equipment. It is also prone to rust in humid or corrosive environments, affecting the service life and safety.

[0005] Compared with the wooden pallet, the plastic pallet has certain moisture resistance and corrosion resistance, but it consumes a large amount of petrochemical resources during production, with high carbon emissions, which makes it difficult to meet the green and low-carbon development requirements under the current "double carbon" background. The plastic pallet is prone to performance degradation such as brittle cracking or softening in high-temperature or low-temperature environments, and has limited strength, which cannot meet the requirements of high-load application scenarios. At the same time, once damaged, it is difficult to repair and has high recycling costs, with poor life cycle economy. SUMMARY

[0006] The technical problem to be solved by the present application is to overcome the deficiencies in the prior art and provide a low-carbon graphene reinforced high-ductility concrete as well as a preparation method and application thereof, which form a high degree of synergy in environmental performance, technical performance and economic benefits, and have broad market promotion potential and great industrialization value.

[0007] The technical solution adopted by the present application to solve the technical problem is: a low-carbon graphene reinforced high-ductility concrete, comprising a low-carbon cementitious material, aggregate, an additive and a reinforcing fiber,

[0008] The low-carbon cementitious material is composed of steel slag powder, mineral powder, fly ash and silica fume;

[0009] The low-carbon cementitious material accounts for 20%-40% of the total mass of dry materials;

[0010] The steel slag powder is 20%-40%,

[0011] The mineral powder is 40%-60%,

[0012] The fly ash is 5%-15%,

[0013] The silica fume is 3%-8%;

[0014] The aggregate is quartz sand, accounting for 45%-55% of the total mass of dry materials;

[0015] The additive includes:

[0016] The expanding agent accounts for 1%-3% of the total mass of the low-carbon cementitious material,

[0017] The water reducing agent accounts for 0.5%-1.2% of the total mass of the low-carbon cementitious material,

[0018] The graphene reinforcing agent is a water-soluble graphene oxide solution, and the dosage accounts for 0.05%-0.15% of the total mass of the cementitious material, the cementitious material is composed of the low-carbon cementitious material, the aggregate, the additive and water, and the water-binder ratio is 0.3-0.35;

[0019] The reinforcing fiber is an ultrahigh molecular weight polyethylene fiber,

[0020] In the stirring process, the ultrahigh molecular weight polyethylene fiber is gradually added into the cementitious material.

[0021] The application also provides a preparation method of the low-carbon graphene reinforced high-ductility concrete according to claim 1, comprising the following steps:

[0022] Step a, preparing the low-carbon cementitious material, the low-carbon cementitious material includes steel slag powder, mineral powder, fly ash and silica fume, grinding the steel slag powder, the mineral powder, the fly ash and the silica fume to obtain high-activity cementitious micro powder;

[0023] Step b, mixing the high-activity cementitious micro powder obtained in step a with an expanding agent, a water reducing agent, a graphene reinforcing agent, quartz sand and water to prepare a cementitious material;

[0024] Step c, stirring the cementitious material, adding an ultrahigh molecular weight polyethylene fiber while stirring, and finally stirring to prepare a cement-based composite slurry, i.e., finally preparing the concrete.

[0025] The application also provides a low-carbon graphene reinforced high-ductility concrete and an application thereof, including an application of a high-strength high-ductility concrete tray, wherein the high-strength high-ductility concrete tray has an integrated frame and a double radial cross frame in the interior.

[0026] The frame is distributed along the four sides and the longitudinal and transverse center lines; the double radial cross frame takes the four corners and the long side midpoints as base points, connects the corner points to the same long side midpoints to form four radial ribs.

[0027] Further specifically, the preparation method of the high-strength high-ductility concrete tray includes the following steps:

[0028] Step 1, preparing a cement-based composite slurry, i.e., preparing concrete;

[0029] Step 2, laying a steel mesh sheet on the bottom of a mold as a skeleton structure;

[0030] Step 3, spraying the slurry along the four sides and the longitudinal and transverse center lines of the mold to form a frame-shaped base body;

[0031] Step 4, connecting the four corners and the long side midpoints of the mold to spray the slurry to form a radial cross structure, which together with the frame-shaped base body constitutes a tray main body;

[0032] Step 5, vibrating and compacting the slurry and controlling the thickness;

[0033] Step 6, installing a support block on the bottom of the tray main body after demolding;

[0034] Step 7, curing to a predetermined age to finally obtain a tray product.

[0035] Further specifically, in the step 2, the steel mesh sheet has a square hole structure, and the square hole has a diameter of 4-6 cm.

[0036] Further specifically, in the step 2, the steel mesh sheet is made of carbon steel or stainless steel.

[0037] Further specifically, in the steps 3 and 4, the slurry is automatically sprayed and distributed by a 3D printing method to form the frame-shaped base body and the radial cross structure.

[0038] Further specifically, in the step 5, the slurry is vibrated and compacted for 10-15 seconds, and the thickness of the slurry is controlled to be 15-25 mm.

[0039] Further specifically limited, in the above technical scheme, in the 7th step, the normal temperature and humidity curing is carried out to a predetermined age of 28-30 days, and finally the tray finished product is prepared, and the self weight of the tray finished product is 20-24 kg.

[0040] The beneficial effects of the present application are: in view of the problems of strong resource dependence, poor durability, high production cost, heavy environmental burden and the like existing in the existing tray products, the present application proposes a low-carbon graphene reinforced high-ductility concrete and its preparation method and application, which becomes a technical path urgently needed to be solved by the industry, the proposed solid waste-based concrete tray takes industrial by-products such as steel slag and fly ash as main raw materials, and cooperates with high-ductility engineering materials such as graphene reinforced fiber network, and has high strength, high ductility, durability and sustainability, can effectively replace the existing wood, steel and plastic trays, solves the multiple shortcomings of traditional trays in strength, cost, environmental protection and service life, and the prepared concrete tray costs about 30 yuan per piece, which is reduced by nearly 30% compared with wood tray and more than 90% compared with steel tray, while realizing the high-strength and high-ductility structural performance, the cost performance of the product is greatly improved; through testing, the bearing capacity of the tray reaches 2.5 tons, which is 3 times that of the wood tray; the accelerated aging experiment shows that the service life is more than 10 years, which is increased by 233% compared with the wood tray (average 3 years); the tray has excellent water resistance, corrosion resistance and wear resistance, and is suitable for various complex working conditions; and through the resource utilization of solid waste, the carbon footprint and raw material dependence are significantly reduced, which meets the development direction of green building materials. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art without creating laborious work.

[0042] Figure 1 is a structural schematic diagram of the tray in the present application;

[0043] Figure 2 is a top view of Figure 1 ;

[0044] Figure 3 is a front view of Figure 1 ;

[0045] Figure 4 is a flow chart of the preparation method of the low-carbon graphene reinforced high-ductility concrete;

[0046] Figure 5 is a flow chart of the preparation method of the high-strength and high-ductility concrete tray.

[0047] The numbers in the figure are: 1. Skeleton structure; 2. Pallet body; 3. Support block; 4. Rivet. DETAILED DESCRIPTION

[0048] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0049] The present invention aims to provide a low-carbon graphene-reinforced high-ductility concrete and a preparation method thereof. By synergistically utilizing industrial solid waste, introducing graphene excitation technology, and optimizing the pallet structure design, the present invention achieves the unity of low carbon and environmental protection, high mechanical properties, and high durability, thus meeting the urgent demand for green materials and long-life load-bearing components in modern logistics, warehousing, construction and other industries.

[0050] See Figure 1 、 Figure 2 and Figure 3 The present invention provides a low-carbon graphene-reinforced high-ductility concrete, which includes a low-carbon cementitious material, aggregate, additives and reinforcing fibers.

[0051] Among them, the low-carbon cementitious material is composed of steel slag powder, mineral powder, fly ash and silica fume.

[0052] The proportion of low-carbon cementitious materials in the total mass of dry materials is:

[0053] Steel slag powder 20%-40%,

[0054] Mineral powder 40%-60%,

[0055] Fly ash 5%-15%,

[0056] Silica fume 3%-8%;

[0057] The aggregate is quartz sand, accounting for 45%-55% of the total dry material mass.

[0058] Additives include:

[0059] Expansion agent, accounting for 1%-3% of the total mass of low-carbon cementitious materials,

[0060] Water reducing agent, accounting for 0.5%-1.2% of the total mass of low carbon cementitious materials,

[0061] The graphene reinforcing agent is a water-soluble graphene oxide solution, and the content is 0.05%-0.15% of the total mass of the cementitious mixture, and the cementitious mixture is composed of low-carbon cementitious material, aggregate, additive and water, and the water-binder ratio is 0.3-0.35.

[0062] The reinforcing fiber is an ultra-high molecular weight polyethylene fiber.

[0063] In the stirring process, the ultra-high molecular weight polyethylene fiber is gradually added into the cementitious mixture.

[0064] See Figure 4 The preparation method of the low-carbon graphene reinforced high-ductility concrete comprises the following steps:

[0065] In the step a, the low-carbon cementitious material is prepared, and the low-carbon cementitious material comprises steel slag powder, mineral powder, fly ash and silica fume, and the steel slag powder, the mineral powder, the fly ash and the silica fume are ground to obtain high-activity cementitious micro-powder; in the low-carbon cementitious material, the fly ash and the silica fume are used as auxiliary active materials. Specifically, the steel slag powder, the mineral powder, the fly ash and the silica fume are respectively placed in a planetary ball mill for grinding, and the ball milling time is 30 minutes, so as to obtain the high-activity cementitious micro-powder.

[0066] In the step b, the high-activity cementitious micro-powder obtained in the step a is mixed with an expanding agent, a water reducing agent, a graphene reinforcing agent, quartz sand and water to prepare a cementitious mixture.

[0067] In the step c, the cementitious mixture is stirred, and the ultra-high molecular weight polyethylene fiber is added during the stirring, and finally a cement-based composite slurry is prepared by stirring, that is, the concrete is finally prepared.

[0068] See Figure 5 The application of the low-carbon graphene reinforced high-ductility concrete comprises the application of a high-strength high-ductility concrete tray, and the high-strength high-ductility concrete tray has an integrally-formed square frame and a double-radiation cross frame in the interior, wherein: the square frame is distributed along four edges and longitudinal and transverse center lines; the double-radiation cross frame takes four corners and long edge midpoints as base points, and connects each corner point to the same long edge midpoint to form four-direction radiation ribs.

[0069] Specifically, the preparation method of the high-strength high-ductility concrete tray comprises the following steps:

[0070] In the first step, a cement-based composite slurry is prepared, that is, the concrete is prepared.

[0071] In the second step, a reinforcement mesh is laid on the bottom of a mold as a skeleton structure 1.

[0072] Preferably, in the second step, the reinforcement mesh is a square hole structure, and the square hole diameter is 4-6 cm.

[0073] Preferably, in the second step, the material of the steel mesh is carbon steel or stainless steel.

[0074] Specifically, according to the forming size of the tray, a 5cm square aperture steel mesh with a matching size is cut as the steel framework structure 1, and is laid on the bottom of the 1200mm x 1000mm flat tray plastic mold.

[0075] In the third step, the slurry is sprayed along the four edges and the longitudinal and transverse center lines of the mold to form a cross-shaped base.

[0076] Specifically, the slurry is applied along the four edges of the flat tray plastic mold with a width of 80mm, and is applied to the center of the long and short edges of the flat tray plastic mold with a width of 80mm in the width and length directions, respectively, to form a cross-shaped tray preliminary structure.

[0077] In the fourth step, the slurry is sprayed at the four corners and the midpoint of the long edge of the mold to form a radial cross structure, which together with the cross-shaped base forms the tray body 2.

[0078] Preferably, in the third and fourth steps, the slurry is automatically sprayed and distributed by 3D printing to form the cross-shaped base and the radial cross structure.

[0079] Specifically, taking the four corners and the midpoint of the 1200mm long edge of the flat tray plastic mold as the base points, the slurry is applied to connect the four corners to the midpoint of the long edge to form two four-way radial cross structures, which together with the cross-shaped tray preliminary structure form the tray body 2 structure, i.e. the final high-strength and high-ductility concrete tray slurry body 1.

[0080] It should be noted that the internal structure of the tray adopts a steel mesh partition structure combining cross-shaped and radial cross structures, which reduces the amount of material used while improving the load distribution efficiency, achieving the unity of lightweight and high strength.

[0081] In the fifth step, the slurry is vibrated and compacted to control the thickness.

[0082] Preferably, in the fifth step, the slurry is vibrated and compacted for 10-15 seconds, and the thickness of the slurry is controlled to be 15-25mm.

[0083] Specifically, the entire flat tray plastic mold is placed on the vibration table and vibrated for 15 seconds, and the thickness of the slurry is controlled to be 20mm, obtaining the initially formed tray body 2.

[0084] In the sixth step, support blocks 3 are installed at the bottom of the tray body 2.

[0085] Preferably, in the sixth step, the support blocks are installed at the four corners, the midpoint of the long edge, the midpoint of the short edge, and the center point of the bottom of the tray body 2.

[0086] Specifically, after 1 day of curing, 9 80mm cubic wood blocks are fixed on the tray body 2 at the four corners, long edge midpoints, short edge midpoints and center point of the tray body 2 by rivets 4. Alternatively, the support block 3 is made of recycled plastic or rubber prefabricated parts, which are connected to the tray body 2 by embedded buckles.

[0087] Step 7, curing to the predetermined age, finally obtaining the tray finished product.

[0088] Preferably, in step 7, the normal temperature and humidity curing is carried out to the predetermined age of 28-30 days, finally obtaining the tray finished product, and the tray finished product has a self weight of 20-24 kg.

[0089] Specifically, the high-strength and high-ductility concrete includes a skeleton structure 1, a tray body 2 and a support block 3. The skeleton structure 1 is laid on the reinforcement mesh sheet at the bottom of the mold; the tray body 2 is coated on the skeleton structure 1 by using slurry, and is integrally formed with a cross-shaped frame and a double radial cross frame, wherein the cross-shaped frame is distributed along the four edges of the tray and the longitudinal and transverse center lines; the double radial cross frame takes the four corners and the long edge midpoints of the tray as the base points, connects each corner point to the same side long edge midpoint to form four radial reinforcements; and the support block 3 is installed at the bottom of the tray body 2.

[0090] It should be noted that, under the premise of ensuring the overall strength and service life, by thinning the thickness of the non-stress area and optimizing the arrangement of the reinforcement mesh, the overall self weight of the tray obtained is controlled within the range of 20-24 kg.

[0091] Specifically, the tray is continuously cured under normal temperature conditions to an age of 28 days, and can be put into use.

[0092] Table 1: Examples 1-3

[0093]

[0094]

[0095] Table 2: Comparative Examples 1-3

[0096]

[0097]

[0098] The conclusion obtained from Table 1 and Table 2 is that Example 1 achieves the best balance in strength, corrosion resistance and lightweight, and is determined as the preferred scheme for industrialization. The graphene reinforcing agent is the core of improving durability (salt spray strength retention rate ↑ 15%); the radial cross structure solves the problem of corner fracture (impact test life ↑ 150%); and the solid waste-based cementitious system reduces the cost while realizing low carbon emission (carbon footprint of traditional concrete ↓ 64%).

[0099] Table 3: Comparison test of mechanical properties of the tray of the present application with traditional wooden tray and steel tray

[0100]

[0101]

[0102] The conclusion obtained from Table 3 is that the tray of the present application realizes mechanical properties close to traditional steel trays with concrete materials, while having the lightweight and economy of traditional wooden trays, and through structural innovation and material enhancement technology, completely solves the compromise problem of traditional trays in the "strength-life-cost" triangular contradiction.

[0103] Table 4: Environmental durability test of the tray of the present application and traditional concrete tray

[0104]

[0105] The conclusion obtained from Table 4 is that the tray of the present application completely solves the difficult problem of poor environmental durability of traditional concrete products through material modification (graphene + solid waste synergy) and structural optimization, which makes the concrete tray first applicable to harsh scenes such as cold chain logistics and chemical storage, breaking through the material application boundary.

[0106] Table 5: Comparison of stress distribution of the tray structure of the present application and the traditional tray structure (load 1500kg)

[0107] Structure Type Max Stress (MPa) Max Deformation (mm) Stress Concentration Area Tianzi + Radiating Frame 12.7 1.05 Support Block Connection Point Traditional Cross Frame 23.4 2.81 Frame Intersection

[0108] The conclusion obtained from Table 5 is that the radial structure reduces the stress peak value by 45.7%, effectively avoiding the risk of corner cracking.

[0109] Table 6: Comparison of comprehensive cost and environmental benefits of the tray of the present application with traditional wooden tray and steel tray (according to 10-year use cycle)

[0110] Index Invention Tray Traditional Wooden Tray Traditional Steel Tray Single Piece Cost ￥30 ￥42 ￥350 Maintenance Cost (10 years) ￥0 ￥120 ￥200 Carbon emissions (kg CO2 / piece) 8.2 15.7 48.5 Solid Waste Utilization Rate 86％ 0％ 0％

[0111] The conclusion obtained from Table 6 is that the tray of the present application realizes economic subversion, environmental leap and circular economy closed loop through "solid waste high value + maintenance free design", marking the transformation of the tray industry from "consumption type resource dependence" to "green manufacturing + circular economy" mode, with both commercial competitiveness and ecological sustainability.

[0112] The core innovation of the present application is to construct a low-carbon graphene reinforced high-ductility concrete based on industrial solid waste resource utilization, graphene synergy excitation and structural optimization weight reduction, and its preparation method, the key innovation of which is embodied in the following three aspects:

[0113] I. Construction of multi-component cementitious material system based on industrial solid waste recycling mechanism: The invention analyzes the synergistic reaction mechanism of solid waste cementitious materials such as steel slag powder, mineral powder, fly ash and silica fume, provides an alkaline environment to stimulate the mineral powder pozzolanic reaction, forms a dense matrix with the fly ash microsphere filling effect, optimizes the composite ratio with cement, and clearly defines its active contribution in high-strength and high-ductility concrete systems, thereby realizing the resource construction of high-performance cementitious material system and improving green and low-carbon performance. Specifically, a low-carbon and environmentally friendly preparation path based on solid waste high-activity cementitious system is constructed, the potential activity of industrial solid waste materials such as steel slag powder, mineral powder, fly ash and silica fume is stimulated by ball milling, a composite cementitious system with high reactivity and good synergistic effect is formed, the cement consumption is significantly reduced, the resource high-value utilization of industrial waste is realized, and the core requirements of green building material development under the "double carbon" target are met.

[0114] II. Introduction and construction of graphene synergistic stimulation enhancement mechanism: By adding an appropriate amount of graphene solution into the concrete system, the activity of solid waste materials such as steel slag is significantly improved, the graphene oxide sheet layer adsorbs Ca 2+ promotes the nucleation of C-S-H gel, bridges microcracks to improve ductility (fracture energy increases by 40%), reduces cement consumption, forms a fine and continuous microstructure network, improves the strength, toughness and durability of the tray product, and realizes the goal of long service life and high reliability. Specifically, the graphene enhancement mechanism is introduced to synergistically improve the mechanical and durability performance, an enhanced conduction network is constructed by introducing graphene solution (such as graphene oxide) into the cementitious system, the densification of hydration products and the uniformity of fiber distribution are promoted, the compressive strength, ductility and crack resistance of the concrete tray are effectively improved, and a performance breakthrough of high strength and high ductility is realized.

[0115] III. Structure optimization weight reduction design and low energy consumption manufacturing process based on mechanical function: Through structural mechanics analysis, the invention optimizes the tray geometry, reduces the use of solid materials in the non-stressed area, thereby reducing the product weight and cost; at the same time, the preparation process is optimized to reduce production energy consumption and complexity, while ensuring the performance of the tray, improving manufacturing efficiency and expanding its application adaptability in multiple scenarios. Specifically, fiber reinforcement and structure optimization are combined to balance performance and weight reduction, the preparation process combines the ultra-high molecular weight polyethylene fiber reinforcement mechanism to further improve toughness and impact resistance; at the same time, the tray internal structure is optimized by arranging the cross structure of the cross structure and the radial cross structure, effectively reducing the use of materials in the non-stressed area, finite element analysis shows that the radial frame reduces the concentrated stress by 62%, allows the thickness of the non-stressed area to be thinned to 15mm, and the overall weight is controlled between 20-24kg, meeting the requirements of convenient handling and energy-saving transportation.

[0116] Four, innovative tray manufacturing process and modular assembly design: the application proposes to combine 3D printing spraying, pre-embedded steel bar mesh, vibration forming and other processes, and introduces standardized wooden block support and rivet 4 fixed connection mode, improves the forming efficiency and structural stability of the tray, and provides a new technical path for the industrialization and automation production of green concrete products.

[0117] Five, significant improvement in economic applicability and environmental adaptability: the comprehensive performance of the finished tray is comparable to that of a steel tray, the unit cost is only about 10% of that of a steel tray, and the cost is saved by about 30% compared with a wooden tray, which is suitable for various use scenarios such as heavy load, high humidity and high corrosion, has good cost performance and promotion potential, and takes into account structural reliability, economy and environmental friendliness.

[0118] In summary, the application realizes a concrete tray product with mechanical properties, low-carbon environmental protection properties and scale application potential through the three-in-one technical path of "efficient utilization of solid waste resources + synergistic excitation enhancement of graphene + integrated design of light structure", which has significant technical innovation and engineering application value.

[0119] The above is only the preferred specific embodiment of the application, but the protection scope of the application is not limited thereto, any person skilled in the art can make equivalent replacement or change within the technical range disclosed by the application according to the technical scheme and inventive concept of the application, which should be covered within the protection scope of the application.

Claims

1. A low-carbon graphene-reinforced high-ductility concrete, characterized in that: Including low carbon cementitious materials, aggregates, additives and reinforcing fibers, Among them, the low-carbon cementitious material is composed of steel slag powder, mineral powder, fly ash and silica fume; The proportion of the low-carbon cementitious material in the total mass of the dry material is: Steel slag powder 20%-40%, Mineral powder 40%-60%, Fly ash 5%-15%, Silica fume 3%-8%; The aggregate is quartz sand, accounting for 45%-55% of the total mass of the dry material; The additives include: Expansion agent, accounting for 1%-3% of the total mass of low-carbon cementitious materials, Water reducer, accounting for 0.5%-1.2% of the total mass of low carbon cementitious materials, The graphene reinforcing agent is a water-soluble graphene oxide solution, and its addition amount accounts for 0.05%-0.15% of the total mass of the cementitious mixture. The cementitious mixture is composed of low-carbon cementitious material, aggregate, additives and water, and the water-cement ratio is 0.3-0.35; The reinforcing fiber is ultra-high molecular weight polyethylene fiber, During the stirring process of the gelling mixed material, the ultra-high molecular weight polyethylene fiber is gradually added into the gelling mixed material.

2. A method for preparing low-carbon graphene reinforced high-ductility concrete according to claim 1, characterized in that: The following steps are involved: Step a: preparing a low-carbon cementitious material, wherein the low-carbon cementitious material comprises steel slag powder, mineral powder, fly ash and silica fume, grinding the steel slag powder, mineral powder, fly ash and silica fume to obtain a high-activity cementitious micropowder; Step b: mixing the high-activity gelled micropowder obtained in step a with an expander, a water reducer, a graphene reinforcing agent, quartz sand, and water to prepare a gelled mixed material; Step c: stirring the cementitious mixed material, adding ultra-high molecular weight polyethylene fibers while stirring, and finally stirring to form a cement-based composite slurry, that is, finally forming concrete.

3. An application of low-carbon graphene reinforced high ductility concrete as claimed in claims 1-2, characterized in that: This includes the application of high-strength and high-ductility concrete pallets, wherein the interior of the high-strength and high-ductility concrete pallet has an integrally formed field-shaped frame and a double radial cross frame, wherein: The field-shaped frame is distributed along the four sides and the vertical and horizontal center lines; the double radial cross frame takes the four corners and the midpoint of the long side as the base points, connecting each corner point to the midpoint of the long side on the same side to form four-way radial ribs.

4. The use of low-carbon graphene reinforced high-ductility concrete according to claim 3, characterized in that: The method for preparing the high-strength and high-ductility concrete pallet comprises the following steps: Step 1: preparing cement-based composite slurry, i.e. preparing concrete; Step 2: Lay a steel mesh on the bottom of the mold to serve as a skeleton structure (1); Step 3: Spray the slurry along the four sides and the vertical and horizontal center lines of the mold to form a field-shaped base; Step 4: Spray slurry on the four corners of the mold and the midpoints of the long sides to form a radial cross structure, which together with the field-shaped base constitutes the tray body (2); Step 5: Vibrate and compact the slurry and control the thickness; Step 6: After demoulding, install the support block (3) at the bottom of the tray body (2); Step 7: Curing to the predetermined age to finally obtain the finished pallet.

5. The use of low-carbon graphene reinforced high ductility concrete according to claim 4, characterized in that: In the second step, the steel mesh has a square hole structure, and the square hole diameter is 4-6 cm.

6. The use of low-carbon graphene reinforced high-ductility concrete according to claim 4, characterized in that: In the second step, the steel mesh is made of carbon steel or stainless steel.

7. The use of low-carbon graphene reinforced high-ductility concrete according to claim 4, characterized in that: In the third and fourth steps, the slurry is automatically sprayed and distributed by 3D printing to form a field-shaped matrix and a radial cross structure.

8. The use of low-carbon graphene reinforced high-ductility concrete according to claim 4, characterized in that: In the fifth step, vibration compaction is performed for 10-15 seconds to control the slurry thickness to 15-25 mm.

9. The use of low-carbon graphene reinforced high-ductility concrete according to claim 4, characterized in that: In the seventh step, the product is cured at room temperature and humidity for a predetermined age of 28-30 days to finally obtain a finished pallet, which has a weight of 20-24 kg.

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