33 results about "Cementitious composite" patented technology

This invention discloses a method for fixing a seepage-proof transition section on an irregular rock slope in a mine landfill. A seepage-proof cementitious composite sprayed material is wet-sprayed onto the irregular rock slope (1-2), forming a seepage-proof cementitious composite sprayed material layer (2) on the surface of the seepage-proof transition section. A seepage-proof geomembrane (3) is laid from the regular rock slope (1-1), and then rubber pads (7) and thin steel plates (6) are laid on the geomembrane (3) from the inside out. Hollow grouting anchors (4) are self-drilled through the holes in the thin steel plates (6) and rubber pads (7), and the edges are trimmed with a seepage-proof sealing agent (8). This invention is applied to the reinforcement of seepage-proof transition sections on irregular rock slopes in mine landfills, overcoming the problem of easy damage during the fixing process of seepage-proof transition sections on irregular rock slopes, eliminating potential hazards, and improving the safety and reliability of the seepage-proof system. It not only has good economic benefits but also significant safety and environmental benefits.

The invention relates to the technical field of polyvinyl alcohol fiber surface modification, and particularly provides a method for preparing hyperbranched polyamide surface modified polyvinyl alcohol fibers through a one-step method and application of the hyperbranched polyamide surface modified polyvinyl alcohol fibers in cement-based materials. The surface modification method comprises the following raw material components: 1 part of polyvinyl alcohol fiber, 1-3 parts of 3, 5-diaminobenzoic acid, 0.1-0.3 part of 4-dimethylaminopyridine and 100 parts of N, N-dimethylformamide. The modification method comprises the following steps: mixing the raw materials, and keeping the constant temperature of 50-80 DEG C to react for 2-5 hours to obtain the surface-modified polyvinyl alcohol fiber. The application comprises the following steps: verifying the change of the interfacial strength between the fiber and the cement-based material before and after modification through a single fiber pull-out sample, and obtaining the change of the mechanical property parameters of the fiber before and after modification through a single fiber tensile test. Compared with unmodified polyvinyl alcohol fibers, the tensile strength and the elongation at break of the surface-modified polyvinyl alcohol fibers disclosed by the invention are respectively improved by 1.1-1.6 times and 1.4-2.2 times; the surface-modified polyvinyl alcohol fiber can enhance the interfacial strength with cement, and the interfacial strength can reach 3.7-6.3 times that of unmodified polyvinyl alcohol fiber; the method can be widely applied to the field of fiber reinforced cement-based composite materials, and has a wide application prospect.

The application discloses a conductive cement-based composite material and a preparation method and application thereof. The conductive cement-based composite material comprises the following components in mass parts: cementing material: 100 parts; fine aggregate: 150-450 parts; conductive hydrogel dry powder: 0.1-2 parts; water reducing agent: 0.5-5 parts. The preparation method of the conductive cement-based composite material comprises the following steps: 1) uniformly mixing the conductive hydrogel dry powder and the cementing material to prepare a mixture, and dissolving the water reducing agent in water to prepare a water reducing agent solution; 2) uniformly mixing the water reducing agent solution into the mixture, then uniformly mixing the fine aggregate, then injecting a mold for forming, then demolding and curing, so that the conductive cement-based composite material is obtained. The conductive cement-based composite material has excellent conductive performance and excellent mechanical performance, and the preparation method is simple, the production cost is low, and the conductive cement-based composite material is suitable for large-scale popularization and application.

The invention belongs to the technical field of building materials, and particularly relates to an energy-absorbing cement-based composite material embedded into a negative Poisson's ratio framework and a preparation method of the energy-absorbing cement-based composite material. The energy-absorbing cement-based composite material embedded with the negative Poisson's ratio framework comprises the negative Poisson's ratio framework and a cement matrix wrapping the negative Poisson's ratio framework, the negative Poisson's ratio skeleton is formed by periodically arranging concave cell element structures; the volume of the negative Poisson's ratio framework is 7%-30% of the total volume of the energy-absorbing cement-based composite material embedded with the negative Poisson's ratio framework. According to the energy-absorbing cement-based composite material embedded with the negative Poisson's ratio framework, the mechanical property requirement of the cement-based material is met, and meanwhile, the cement-based composite material is endowed with deformation energy-absorbing performance through toughening of the negative Poisson's ratio embedded framework.

Methods of additive manufacturing by spraying and automated spraying devices are provided. The device comprises a feed system and an automated spray head with at least one nozzle in communication with a first supply and a second supply to spray at least one stream comprising fibers and a sprayable cementitious material. A first nozzle may deliver the first sprayed stream comprising fibers, a second nozzle may deliver a second sprayed stream of first sprayable cementitious material, and a third nozzle may deliver a third sprayed stream of second sprayable cementitious material comprising carbon dioxide. The device forms a cementitious component on a target having a first region comprising a reinforced cementitious composite material. There is also a second distinct region comprising a carbonized cementitious material formed from the third sprayed stream comprising the second sprayable cementitious material comprising carbon dioxide.

The photocuring 3D printing cement-based composite material is prepared by the following steps: adding a stabilizer into deionized water, and stirring until the stabilizer is completely dissolved to obtain a stabilizer solution; adding an organic monomer, a cross-linking agent and a dispersing agent into the stabilizer solution, stirring until the materials are completely dissolved, then adding a photoinitiator, and performing ultrasonic dispersion to obtain an organic mixed solution; placing the mixed solution in a vacuum drying oven, and removing oxygen at room temperature; adding cement and a water reducing agent into the deoxygenated mixed solution, and uniformly stirring to obtain a precursor solution; the precursor solution is poured into a digital light treatment 3D printer material pool, the sliced three-dimensional model is printed, organic components in the precursor solution are subjected to a photopolymerization reaction, and a polymer template wrapped with cement particles is formed through 3D printing; and coating a film, and carrying out standard curing for 28 days, so that the cement particles are subjected to hydration reaction continuously, and finally, the set and hardened light-cured 3D printing cement-based composite material is obtained. And high-precision forming of a complex structure is achieved.

The application discloses a kind of fiber fabric reinforced cement-based composite material prestressed reinforcement system, including concrete structure, fiber fabric reinforced cement-based composite material layer, iron-based shape memory alloy material, monitoring control unit;The fiber fabric reinforced cement-based composite material layer includes fiber grid and inorganic cement matrix;The iron-based shape memory alloy material is arranged along the two ends of fiber grid extension direction in the fiber fabric reinforced cement-based composite material layer, one end is fixed with the fiber grid, the other end is fixed with the concrete structure;The monitoring control unit is connected with the fiber fabric reinforced cement-based composite material layer and iron-based shape memory alloy material.The application is arranged along the fiber direction by iron-based shape memory alloy material after pre-stretching, and pre-tightening force along the fiber direction is applied to fiber grid after being activated by heating, to prevent fiber bending in fiber layer, bending.

The present application relates to soft soil reinforcement technical field, specifically to a kind of high permeability soft soil grouting reinforcement composite material and preparation method thereof, by mass fraction, including the following raw materials: hydraulically setting cementitious composite material 80~120 parts, inorganic water-consuming powder 0~1.5 parts, surfactant 0.1~1 parts, early strength surfactant 0~0.5 parts and water 20~40 parts.The material of the present application enters soft soil, by the penetration and water consumption of inorganic water-consuming powder and hydraulically setting cementitious composite material, can significantly reduce the moisture content in soft soil, and can form dendritic support structure in soft soil, play a significant reinforcement effect.

This invention belongs to the field of cement technology, specifically relating to a method for preparing molybdenum tailings cementitious composites using a microwave method. The specific steps of this method are as follows: Molybdenum tailings are ground together with other admixtures; water is added to the molybdenum tailings powder and stirred evenly to obtain a mixture; a microwave field is applied to the mixture and maintained for 10-40 minutes to obtain a composite material; the composite material is crushed and sieved to obtain the molybdenum tailings cementitious composite material prepared by the microwave method. This method uses molybdenum tailings as the main raw material, combined with natural minerals such as limestone and bauxite, to prepare a composite material with high activity. The operation is simple and does not require extensive new equipment or technology.

The application relates to the technical field of building materials, in particular to a self-repairing cement-based composite material and a preparation method thereof; the self-repairing cement-based composite material is prepared from the following raw materials in parts by weight: 1000-1200 parts of coarse aggregate, 600-850 parts of fine aggregate, 300-450 parts of Portland cement, 40-60 parts of fly ash, 150-200 parts of mineral powder, 4-6 parts of a water reducing agent, 5-8 parts of a retarder, 60-120 parts of a self-repairing agent and 150-200 parts of water; the coarse aggregate is selected from gravel with a particle size of 5-20 mm, and the fine aggregate is selected from medium sand with a particle size of 0.5-0.8 mm; the cement is selected from P.O52.5 Portland cement, the mineral powder is S95 grade, and the fly ash is grade II; the self-repairing cement-based composite material prepared by the application can not only efficiently repair concrete cracks but also has a long repair time and can effectively improve the waterproof performance of the repaired concrete, effectively guarantees the quality of the concrete, and prolongs the service life of the concrete to a certain extent.

This application provides a multi-level scale sisal cellulose fiber reinforced cement-based composite material and its preparation method. The composite material comprises cement, standard sand, and multi-level scale sisal cellulose fibers, wherein the amount of multi-level scale sisal cellulose fibers incorporated is 0.01%–0.3% of the cement mass, and the diameter of the multi-level scale sisal cellulose fibers is in the nanometer scale and the length is in the micrometer scale. This application optimizes existing cement-based material curing methods and significantly improves the mechanical strength and durability of cement-based materials.

The invention relates to a combined experiment method for improving ECC performance test success probability, and belongs to the technical field of civil engineering material test and design. Aiming at the problems of low trial and error efficiency, large discreteness of experimental results and the like in the research and development of the existing high-strength and ultrahigh-ductility engineering cementitious composites (ECC), the invention provides a closed-loop experimental system based on the combination of micromechanics matching screening and macroscopic accurate verification. The method mainly comprises two stages: in a screening stage (step 1), respectively through a pure matrix three-point bending experiment and a single fiber bundle drawing experiment, acquiring matrix fracture toughness and interface bonding strength parameters, verifying an energy matching relationship according to a micromechanics criterion, if the energy matching relationship is not matched, feeding back and guiding fiber modification or matrix adjustment, and if the energy matching relationship is not matched, feeding back and guiding the interface bonding strength parameters; reverse design and pre-screening of the mix proportion are realized; in the verification stage (step 2), a special dumbbell test piece designed with a specific long scale distance (80mm effective observation area) is adopted to perform a uniaxial tensile test on the all-component material meeting the matching requirement, and end damage interference is avoided. By applying the method, the research and development period can be shortened by 40% or above, the high-performance ECC with the compressive strength larger than 135 MPa, the tensile strength larger than 10.0 MPa and the tensile strain capacity of 10%-12% is successfully guided, prepared and verified, and the test success rate and the data authenticity are remarkably improved.

The present invention refers to a Daytime Radiative Cooling Cementitious composite includingan OPC binder in the form of grains, with an amount of Fe2O3 lower than 0.05% by weight with respect to the total weight of the OPC binder, wherein the grain size is below 25 μm,water, wherein the weight ratio between water and the OPC binder is between 0.2 to 0.6,an addition in a proportion between 0.1% and 50% by weight with respect to the weight of the OPC binderand wherein the resulting DRCCC has a pore size below 6 μm as defined by mercury intrusion porosimetry, that can optionally comprise micropatterns, and to its use in the construction industry, such as building construction, in civil works such as reservoirs, bridges, dams and sewers, in solar cell technology or in urban architectural design.

The invention relates to the technical field of triboelectric nano-generators, and particularly discloses a composite material for preparing a geopolymer-based triboelectric nano-generator and a preparation method of the composite material. The composite material comprises the following components: 28%-32% of first-grade fly ash, 18%-22% of mineral powder, 4%-6% of sodium silicate, 1%-2% of graphene, 3%-4% of functionalized Ti3C2Tx nanosheets, 3%-4% of barium titanate nanoparticles, 3%-4% of polyvinylidene fluoride nanofibers, 3%-4% of polydimethylsiloxane elastic microspheres, 0.5%-1% of a polycarboxylate superplasticizer, 1%-2% of nano-hydroxyapatite and 24% of water. The geopolymer substrate disclosed by the invention is prepared from a graphene modified gelling composite material, and excellent mechanical properties can be obtained after the geopolymer substrate is completely cured for 28 days. Under the frequency of 1kHz, the dielectric constant of the graphene geopolymer substrate can reach 120.

The present application belongs to the technical field of engineering cement-based composite materials, and particularly relates to a self-healing cement-based composite material and a preparation method thereof. Raw material composition of the self-healing cement-based composite material comprises Portland cement, fly ash, slag powder, water reducing agent, fiber, SAP and capsule type additive. The capsule type additive comprises an inner core and a silica coating shell layer, and the inner core comprises a silane modified ethylene-acrylic ester-GMA terpolymer and a sodium carbonate activator. The self-healing cement-based composite material of the present application can effectively limit cracking through fiber reinforcement ductility, and further realizes good synergistic self-healing performance through SAP and the capsule type additive. The self-healing cement-based composite material has the advantages of low cost, stable performance and easy industrialization.

This invention provides an auxiliary component for fireproof and flame-retardant indoor soundproof walls based on inorganic cementitious composite materials, relating to the field of fireproof and flame-retardant board technology. It includes: a wear-resistant fire-retardant board and a sound-insulating fireproof board. The wear-resistant fire-retardant board is composed of the following components by weight: 40-60 parts ceramic fiber, 5-10 parts aluminate cement clinker, and 10-15 parts silica powder. The sound-insulating fireproof board is composed of the following components by weight: 25-30 parts ceramic fiber, 15-20 parts potassium feldspar powder, 5-10 parts aluminate cement clinker, 15-20 parts expanded perlite, and 5-10 parts porous diatomaceous earth. The core materials of the wear-resistant fire-retardant board and the sound-insulating fireproof board in this invention are inorganic substrates such as ceramic fiber and potassium feldspar, possessing a Class A long-lasting flame-retardant effect, and also exhibiting excellent characteristics such as wear resistance, high temperature resistance, aging resistance, and sound insulation. This solves the problem that most components do not use high-efficiency inorganic substrates, resulting in overall performance that does not meet ideal standards.

The invention relates to the field of cementing materials, and particularly discloses a waste residue cementing composite material and a preparation method thereof. The waste residue cemented composite material comprises the following raw materials in parts by weight: 30-40 parts of mineral powder, 20-30 parts of waste brick powder, 10-20 parts of tailings, 5-10 parts of an alkaline material, 1-3 parts of a water-retaining agent, 1-3 parts of an activating agent, 5-10 parts of a water-soluble organic polymer and 3-5 parts of a toughening material, the water-soluble organic polymer is prepared from the following raw materials: 2-acrylamide-2-methylpropanesulfonic acid, acrylic acid and acrylamide; the water-soluble organic polymer prepared from the 2-acrylamide-2-methylpropanesulfonic acid, the acrylic acid and the acrylamide is adopted, so that the water loss degree of the composite material is delayed, and the phenomenon that the composite material cracks due to water loss is inhibited.

This invention relates to a method, apparatus, equipment, and storage medium for preparing cement-based composite materials. The method includes: retrieving a process parameter package from a database based on initial parameters; generating control signals for an ultrasonic device, a CO2 gas supply device, and a stirring device based on the process parameter package; sending the ultrasonic device control signal to the ultrasonic device, the CO2 gas supply device control signal to the CO2 gas supply device, and the stirring device control signal to the stirring device, so that the ultrasonic device, the CO2 gas supply device, and the stirring device operate on materials within the same reactor. This disclosure achieves carbon fixation during cement slurry mixing, rapidly improves the early strength of the cement-based material system, facilitates subsequent rapid demolding, curing, and practical application, reduces energy consumption, and is green and low-carbon.

Cement pores are filled with modified butyl rubber powder, surface activated rubber particles form a skeleton structure, the modified butyl rubber powder and the surface activated rubber particles are grafted through maleic anhydride and form a chemical bond bridge with a silane coupling agent, a two-stage damping system is constructed, and the high-damping flame-retardant pavement cementing composite material is prepared. Therefore, the vibration and noise reduction performance of the composite material can be effectively improved. The intumescent flame retardant forms a compact carbon layer at high temperature, oxygen and heat transfer are effectively isolated, the flame retardance of the material is effectively improved, and the problem that a single component is prone to failure is solved through the compound design. And the ethylene glycol antifreeze agent can greatly improve the flexibility and crack resistance of the composite material under a low-temperature condition, so that the use requirements in cold regions are met. The application of the waste rubber particles subjected to surface activation treatment not only improves the interfacial compatibility of the material and a cement matrix, but also realizes efficient cyclic utilization of resources, and has excellent economic and environmental benefits.

The application belongs to the technical field of mine engineering materials, and particularly relates to a cementitious material composite targeted activator for consolidating tailings and a preparation method thereof. The cementitious material composite targeted activator for consolidating tailings comprises the following raw materials in parts by weight: 10-30 parts of an alkaline excitation source, 5-10 parts of a core-shell structure agent, 20-50 parts of a nanocrystal seed, 4-10 parts of an organic template agent, and 1-5 parts of a heavy metal solidification agent. The composite targeted activator realizes targeted activation through multi-component cooperation, is suitable for tailings with different properties, and has excellent performance such as compressive strength and heavy metal solidification rate. The composite targeted activator not only significantly improves the utilization rate of industrial solid waste, but also is environmentally friendly and economical, and is suitable for mine tailings filling engineering.

The invention relates to the technical field of building materials, in particular to a self-repairing cement-based composite material and a preparation method thereof. The self-repairing cement-based composite material is prepared from the following raw materials in parts by weight: 1000 to 1200 parts of coarse aggregate, 600 to 850 parts of fine aggregate, 300 to 450 parts of Portland cement, 40 to 60 parts of fly ash, 150 to 200 parts of mineral powder, 4 to 6 parts of water reducing agent, 5 to 8 parts of retarder, 60 to 120 parts of self-repairing agent and 150 to 200 parts of water, the coarse aggregate is selected from gravel with the particle size of 5-20 mm, and the fine aggregate is selected from medium sand with the particle size of 0.5-0.8 mm; the cement is P.O52.5 Portland cement, the mineral powder is S95 grade, and the fly ash is II grade; the prepared self-repairing cement-based composite material not only can efficiently repair concrete cracks, but also can effectively improve the waterproof performance of the concrete repaired position, effectively guarantees the quality of the concrete, and prolongs the service life of the concrete to a certain extent.

Disclosed are methods of making a cementitious composite material using a low reactivity coal ash. Also disclosed herein are cementitious composite materials.

The embodiment of the invention discloses a non-toxic and harmless inorganic double-liquid grouting material with good durability and a preparation method thereof. The material comprises a high-performance cement-based gelling composite material and a cement setting adjusting material, the high-performance cement-based cementitious composite material comprises the following components in percentage by mass: 80-85% of ordinary Portland cement, 5-10% of a mineral admixture and 5-10% of limestone powder, the cement setting adjusting material composite material comprises the following components in percentage by mass: 65%-75% of a flash setting component, 5%-10% of a setting adjusting component and 15%-25% of a reinforcing component. According to the invention, a series of problems of too fast gelation time, large slurry viscosity, large pumping resistance, low early strength, influence on water quality due to high content of soluble alkali metal, poor water resistance of a stone body, easy corrosion by sulfate and the like of a traditional cement-water glass double-liquid grouting material can be solved, and the cement-water glass double-liquid grouting material has good popularization and application values.

This invention discloses a method for evaluating the interfacial reinforcement of ultra-high performance concrete using limestone powder as a substitute for silica fume, belonging to the technical field of cementitious composite material mix design and performance evaluation. The invention first establishes a reference cementitious material matrix system containing silica fume and sets up gradient substitution groups for silica fume using limestone powder. The strength of specimens with different substitution ratios is pre-screened based on the 28-day matrix compressive strength, selecting representative substitution groups. The 100-hour cumulative heat release, 28-day total porosity, peak pull-out load of a single steel fiber, and pull-out work of a single fiber are measured for the representative substitution groups. Hydration response coefficient, pore structure compactness coefficient, peak bearing capacity coefficient, and energy dissipation coefficient are constructed, and a coupled determination method of interfacial reinforcement index (IEI) and strength constraint coefficient (Kc) is established. Based on IEI and Kc, candidate reinforcement groups, optimal substitution groups, and corresponding substitution ratios are output. This invention can be used for the rapid screening and quantitative design of low-silica fume ultra-high performance concrete cementitious systems.

The invention discloses a high-strength cement-based composite drill rod which comprises a rod body, a male head and a female head. The male head and the female head are fixedly connected to two ends of the rod body respectively; the rod body comprises a reinforcement cage framework integrally in a circular tube shape and a high-strength cement-based composite material poured outside the reinforcement cage framework; a first channel is arranged in the male head, a second channel is arranged in the female head, a third channel communicated with the first channel and the second channel is arranged in the rod body, and when the male head is in threaded connection with the female head of another drill rod, the first channel is in butt joint with the second channel of the female head of the other drill rod to form a continuous medium circulation channel. The drill rod is scientific in design, simple in structure, easy to produce and high in safety and reliability, the labor intensity of workers and disturbance to drill holes are reduced, the drilling efficiency is improved, the cost of the drill rod is greatly reduced, and recovery of the drill rod and reutilization of materials are facilitated. And the method is more environment-friendly and has a better development prospect.

This invention provides a design method for reinforcing masonry structures with high-ductility cement-based composite materials based on toughness, comprising the following steps: assessing the seismic toughness level of the existing masonry structure to determine the seismic toughness improvement target; preliminarily determining the design parameters of the high-ductility cement-based composite material surface layer based on the seismic toughness improvement target; assessing the seismic toughness level of the reinforced masonry structure to confirm whether the seismic toughness improvement target is met, and obtaining the design parameters of the high-ductility cement-based composite material surface layer that meet the seismic toughness improvement target based on the confirmation result. The beneficial effects of this invention are: this invention organically combines the quantification of seismic toughness with the reinforcement design scheme, and uses a new high-performance material to establish a reinforcement design method for existing masonry structures to improve the seismic toughness level of existing masonry structures. Therefore, this invention not only considers the improvement of the seismic performance of existing masonry structures, but also the optimization of structural repair time and repair costs.

Methods of preparing a cementitious structure for carbon dioxide (CO2) sequestration are provided. The cementitious structure may be a cast in a mold. First, a cementitious composite material comprising binder and water is conditioned, for example, in a mold by exposing the cementitious composite material to ≥about 50% to ≤about 80% relative humidity for ≥about 3 hours to ≤about 24 hours. The cementitious composite material is then dried to remove ≥about 10% by weight of initial water in the cementitious composite material. The cementitious structure formed is capable of a carbon dioxide uptake level of greater than or equal to about 6% by weight binder. The cementitious structure has a tensile strain capacity of ≥about 1% and a uniaxial tensile strength of ≥about 1 MPa. The method may also include carbonating the cementitious structure, following by an optional further hydration process.

This invention relates to a hybrid fiber engineering cement-based composite material and its preparation method. The composite material is made from the following raw materials in parts by weight: 500 parts cement, 1000 parts iron tailings powder, 400 parts water, 500 parts fine aggregate, 150-200 parts modified PVA fiber, 0-50 parts recycled tire steel fiber, 50-70 parts bio-keratin, 5 parts water-reducing agent, and 1 part thickener. This invention leverages the advantages of fiber blending to improve the mechanical and durability properties of ECC (Extractable Cemented Carbide), and the resulting cement-based material also possesses self-healing capabilities under humid conditions. By using recycled tire steel fiber to partially replace modified PVA fiber in the preparation of hybrid fiber ECC, the preparation cost of ECC is reduced while ensuring strain hardening performance, resulting in certain economic advantages. The reuse of waste tires and bio-keratin improves the utilization rate of solid waste, achieving sustainable development of resources and the environment, and thus possessing certain environmental advantages.

The invention belongs to the technical field of solid waste recycling and building materials, and particularly relates to a low-carbon gelling composite material based on pyrolytic fly ash and a preparation method of the low-carbon gelling composite material. The method comprises the following steps: preparing a surface functional layer mixture and a base layer mixture; the surface functional layer mixture and the base layer mixture both comprise a gel material and aggregate; the gel material of the surface functional layer mixture and the gel material of the base layer mixture both contain pyrolytic fly ash; the mass ratio of the pyrolytic fly ash in the gel material of the surface functional layer mixture is higher than that of the pyrolytic fly ash in the gel material of the base layer mixture. According to the invention, a composite excitation system is utilized, and the efficient excitation of the early activity of the pyrolytic fly ash and the stable increase of the later strength of the pyrolytic fly ash are realized through the cooperation of the alkali excitant and the sulfate excitant; a'gradient structure 'design is created, and a compact functional layer with high fly ash mixing amount and low water-binder ratio on the surface layer is constructed, so that physical and chemical dual long-acting protection against chloride ion erosion is provided for a concrete member.

The invention discloses a high-toughness cement-based composite material for widening and splicing new and old bridges and application of the high-toughness cement-based composite material. The high-toughness cement-based composite material comprises the following components in parts by weight: 380-450 parts of a cementing material; 500 to 580 parts of grading machine-made sand; the volume mixing amount of the hybrid fiber is 1.8%-2.5% of that of the high-toughness cement-based composite material; 5-8 parts of a polycarboxylic acid high-performance water reducing agent; 8-12 parts of a composite expanding agent; 1-3 parts of a crystalline active chemical agent; 130 to 150 parts of water; the cementing material is prepared from 300 to 350 parts of ordinary Portland cement and 80 to 100 parts of composite mineral admixture. The material disclosed by the invention has the characteristics of ultrahigh toughness, moderate early strength and micro-expansion, and can effectively solve the problems of differential settlement, shrinkage cracking and interface bonding failure at the joint of new and old bridges. According to the corresponding construction method, interface treatment, material pouring and maintenance processes are defined, and long-term safety and stability of the splicing structure are guaranteed through combination of materials and the processes.