334 results about "Toughening" patented technology

The invention provides low-temperature-resistant high-modulus rubber asphalt and a preparation method thereof, and relates to the technical field of rubber asphalt, and preparation raw materials of the low-temperature-resistant high-modulus rubber asphalt comprise the following components: matrix asphalt, rubber powder, a desulfurizer, a free radical type thermal initiation crosslinking agent, a reinforcing agent, a coupling agent, a flexibilizer, a viscosity reducer and an auxiliary agent. According to the low-temperature-resistant high-modulus rubber asphalt provided by the invention, the ductility at 5 DEG C is greater than 30cm, the maximum breaking flexural-tensile strain of a mixture at-10 DEG C is greater than 4000 mu epsilon, the dynamic modulus of the mixture at 15 DEG C is greater than 15000MPa, and the high-temperature performance and modulus of high-modulus asphalt concrete are not reduced while the crack resistance of the high-modulus asphalt concrete is helped to be improved. When being applied to pavement middle layer pavement, the pavement anti-cracking agent can improve the anti-cracking performance of the whole pavement structure, reduce the pavement maintenance cost and improve the driving safety.

The invention relates to the technical field of special functional coating materials for lost foam casting, and particularly discloses a special coating for a large machine tool casting lost foam as well as application and a use method of the special coating. According to the invention, the full-temperature-range functional composite material and the composite aggregate are used for synergistic reinforcement, and mullite is used for high-temperature reinforcement; the temperature-sensitive polymer modified graphite can realize intelligent temperature response of graphite performance; spodumene is used as a thermal expansion adaptive fluxing agent, so that medium-temperature healing and thermal expansion adjustment of a coating system are facilitated; the composite reinforced fibers are reinforced and toughened aiming at large thermal stress of thick and large parts; as an ultralow-temperature glazing agent, the boron-containing glazing agent can form an initial liquid phase at about 450 DEG C to seal the surface of the coating and purify a ventilation channel; the rare earth oxide serving as a high-temperature phase stabilizer can be dissolved in mullite crystal lattices, so that the high-temperature phase stability is improved, and ceramic nodes are refined. Through raw material design, on the premise of ensuring moderate air permeability, the ultrahigh strength and crack resistance of a coating system at extremely high temperature are improved.

The invention discloses self-repairing and rapid-repairing cement-based mortar and a preparation method thereof, and belongs to the technical field of building materials. The self-repairing and rapid-repairing cement-based mortar is prepared from the following raw materials: 5500-6500 parts of a composite cementing material; 200 to 650 parts of an inorganic permeable crystalline material; 1500 to 3500 parts of a filling material; 307 to 510 parts of a rapid hardening component; 2-5 parts of a moisturizing and thickening component; 150 to 250 parts of a toughening and softening component; and 6-10 parts of a water reducing agent. The preparation method of the self-repairing and rapid-repairing cement-based mortar comprises the following steps: preparing the raw materials according to the proportion, uniformly mixing, adding the mixing water, and uniformly mixing to obtain the self-repairing and rapid-repairing cement-based mortar. The self-repairing quick-repairing cement-based mortar is efficient in water resistance and leaking stoppage, quick in setting and hardening and high in hour strength and has the function of silt; and a good self-repairing capability is achieved for microcosmic cracks of 0.1 mm.

The invention relates to the technical field of fiber reinforced composite materials, in particular to a basalt fiber reinforced composite board in a dynamic heavy load environment and a preparation method. The basalt fiber reinforced composite board comprises an upper surface layer, an upper reinforcing layer, a core layer, a lower reinforcing layer and a lower surface layer. According to the invention, rigid nanoparticles and carboxyl-terminated nitrile rubber are introduced to construct a rigid-flexible composite toughening system, and nano aluminum oxide and silicon dioxide are taken as rigid particles and are uniformly dispersed in an epoxy cross-linked network, so that slippage and crack propagation of molecular chains can be effectively hindered, and the rigidity and damage resistance of a matrix are improved; meanwhile, the carboxyl-terminated nitrile rubber is used as reactive liquid rubber, after carboxyl of the carboxyl-terminated nitrile rubber reacts with epoxy groups, the carboxyl-terminated nitrile rubber is distributed in a matrix in a sea-island structure and can serve as stress concentration points, a large amount of crazing and shear bands can be induced, and a large amount of impact energy can be consumed; and the impact toughness is greatly improved while the high strength of the material is maintained.

The invention discloses daily high-strength environment-friendly ceramic and a preparation process thereof, and particularly relates to the field of ceramic materials, and the preparation process comprises the following steps: S1, preparation and molding of green body powder, S2, preparation of multifunctional glaze slip, and S3, glazing and sintering. By introducing the pre-compounded reinforced fiber, the SiO2-Al2O3 coating on the surface of the pre-compounded reinforced fiber and the ceramic matrix form strong interface bonding at high temperature, so that the comprehensive mechanical property of the green body is improved, the load is effectively transmitted and dispersed, and meanwhile, the fiber has remarkable toughening and impact resisting effects; due to the addition of the biomass derived porous carbon powder, the fracture toughness and thermal shock resistance of the material are further improved through the pore-forming and buffering effects of the biomass derived porous carbon powder; while high bending strength is maintained, impact toughness is improved in a breakthrough manner, and the composite material is more suitable for collision scenes in daily use.

The invention relates to the technical field of reinforced concrete, in particular to a preparation technology of a reinforced concrete telegraph pole, the performance of the concrete telegraph pole is improved through a multi-scale fiber synergistic toughening method, when the telegraph pole bears a bending load, steel fibers firstly play a role to restrain large cracks, and when micro cracks appear, the steel fibers play a role to restrain the large cracks. The denser composite fiber network bears stress to realize multi-stage crack resistance, which is combined with the high early strength characteristic of the sulphoaluminate cement, so that the telegraph pole has excellent impact resistance and fatigue resistance while obtaining extremely high early strength; the surface of the aggregate modified by the silicon dioxide aerogel is covered with a high-activity and high-specific-surface-area nano silicon dioxide layer, and in an alkali-rich and calcium-rich environment provided by sulfo-aluminate water cement hydration, the nano silicon dioxide and a cement hydration product are subjected to a violent pozzolanic reaction, so that the surface of the aggregate is modified by the sulfo-aluminate water cement; therefore, the compressive strength and the flexural tensile strength of the concrete are remarkably improved.

The invention discloses a design method capable of giving consideration to both toughening and crack path controllability for a brittle material, and belongs to the technical field of fracture mechanics and artificial intelligence crossing, and the method comprises the steps: employing an input coding method based on space-response double-domain fusion to carry out feature extraction; introducing a channel attention mechanism to perform weighted fusion on the extracted double-domain features, and generating prediction results for different key tasks; evaluating the reliability of a prediction result by adopting a phase field verification and closed-loop adaptive optimization mode, and carrying out iterative training and optimization on the neural network; and taking the optimized neural network as a fitness evaluation function of double-target genetic optimization, and performing multi-target optimization on defect generation parameters. According to the invention, through fusion of the spatial domain and the response domain, geometric morphology and dynamic response characteristics are cooperatively extracted, and the prediction precision of complex fracture behaviors is improved; through non-dominated sorting multi-objective optimization under physical constraints, a high-toughness and path-controllable optimal solution is output, and brittle materials are pushed to cross an active controllable fracture design.

The invention discloses a preparation method of a zirconium oxide toughened aluminum oxide ceramic substrate, which comprises the following steps: respectively carrying out surface modification on aluminum oxide powder and zirconium oxide powder by adopting a coupling agent, a catalyst and a cross-linking agent, then mixing the two modified powder with a rare earth sintering aid, a dispersing agent, a binder and a plasticizer, and carrying out ball milling treatment, thereby obtaining the zirconium oxide toughened aluminum oxide ceramic substrate. Carrying out tape casting and sintering processes to obtain a target ceramic substrate; the preparation method is simple, the process is easy to control, the bending strength of the prepared zirconium oxide toughened aluminum oxide ceramic substrate can reach 847 MPa at most, and the fracture toughness can reach 7.6 MPa.m < 1 / 2 > at most.

The invention belongs to the technical field of civil engineering materials, and particularly relates to sprayed concrete suitable for a chlorine salt erosion environment and a preparation method of the sprayed concrete. And meanwhile, the bionic helical carbon nanotube-polymer composite gel is pre-dispersed in water. Sequentially adding the aggregate, the fiber and the composite cementing material, carrying out dry mixing, adding the gel dispersion liquid, the water reducing agent and the air entraining agent, and stirring to obtain a mixture; and finally, adding an alkali-free liquid accelerator at a nozzle through a wet spraying process, and spraying the alkali-free liquid accelerator to a construction surface. The nano hybrid material can effectively adsorb and lock chloride ions, and the bionic gel has a crack self-repairing function. And the two components have a synergistic effect, and are combined with a compact microstructure and a fiber reinforcing and toughening effect, so that the obtained concrete has extremely high chloride ion penetration resistance and durability, and is particularly suitable for support and protection engineering in chlorine salt environments such as temporary expressways and the like.

The present application relates to the technical field of special functional coating materials for lost foam casting, and specifically discloses a special coating for large machine tool castings, and application and use method thereof. The present application synergistically strengthens full-temperature-range functional composite materials and composite aggregates, and uses mullite for high-temperature strengthening. Temperature-sensitive polymer modified graphite can realize intelligent temperature response of graphite performance. Lithium feldspar as a thermal expansion adaptive fluxing agent is more conducive to the medium-temperature healing and thermal expansion adjustment of the coating system. Composite reinforcing fibers are used to enhance and toughen the thick and large workpiece with large thermal stress. Boron-containing glazing agent as an ultralow-temperature glazing agent can form an initial liquid phase at about 450 DEG C, seal the surface of the coating, and purify the air passage. Rare earth oxides as high-temperature phase stabilizers can be solid-solved in the mullite lattice, improve the high-temperature phase stability, and refine the ceramic nodes. Through raw material design, the coating system has improved ultrahigh strength and crack resistance at extreme high temperatures under the premise of ensuring moderate air permeability.

This invention provides a crack-resistant, high-toughness composite packaging bag and its preparation method, relating to the field of composite packaging bag technology. The bag includes a bag body comprising an inner cold-resistant toughening layer, a middle elastic buffer layer, and an outer tough protective layer. The inner wall of the bag body has a material guide strip, and the bottom of the inner wall has longitudinal reinforcing ribs. The material guide strip has exhaust micropores. A flexible buffer pad is installed at the bottom of the bag body. Elastic buffer strips are provided on both sides of the bag body. Rounded transition corners are provided on both outer sides of the bottom of the bag body. In this invention, by using an inner cold-resistant toughening layer made of modified metallocene PE and POE toughening agents combined with a TPE material middle elastic buffer layer, the toughness of the bag body in low-temperature environments of -18℃ to -5℃ is significantly improved, preventing low-temperature embrittlement of the substrate. It can effectively withstand the instantaneous impact of high-speed filling of viscous materials, completely solving the problem of low-temperature embrittlement and cracking.

The invention provides an MAX phase / alumina layered composite ceramic and an in-situ synthesis preparation method thereof, and the method comprises the following steps: respectively preparing an alumina matrix layer and an MAX phase interface layer through a tape casting method, then alternately laminating the alumina matrix layer and the MAX phase interface layer, and finally carrying out hot pressed sintering to obtain a layered composite ceramic product. According to the invention, the layered composite ceramic which takes aluminum oxide as a matrix and MAX-phase ceramic as an interlayer is prepared through an in-situ synthesis technology, so that the effects of great toughening, strength increase without reduction and high damage tolerance are realized, and the fracture mode is converted from brittle fracture of aluminum oxide ceramic to safe stepped fracture. The strength and toughness of the aluminum oxide ceramic are successfully balanced and synergistically improved, and the industrial problem that strength and toughness cannot be both considered in a traditional aluminum oxide ceramic toughening technology is solved.

The invention relates to the technical field of glass ceramics, in particular to a silicon dioxide-containing glass ceramic wafer substrate and a preparation method thereof. The preparation method comprises the following steps: weighing aluminum oxide, hydroxyethyl urea, chromium dioxide, lithium oxide, magnesium oxide, titanium dioxide, a clarifying agent, a toughening agent and silicon dioxide; preparing an aqueous solution from hydroxyethyl urea, and putting the powder, a clarifying agent, a toughening agent and the aqueous solution into a ball milling tank to obtain slurry; carrying out vacuum defoaming, tape casting, drying, glue removal heat treatment, glass melting, rolling and annealing treatment to obtain a glass plate; and polishing, ultrasonically cleaning and drying the glass plate to obtain the wafer substrate. According to the preparation method, hydroxyethyl urea and chromium dioxide are combined under a specific controlled heat treatment system, so that the functions of a conventional dispersing agent are exceeded, a unique toughening phase existing in a grain boundary is generated through in-situ reaction, uniform formation of a superfine nanocrystalline structure is realized synergistically, and thus the fracture toughness and the surface flatness of the material are synchronously and remarkably improved.

The invention discloses toughened honeycomb ceramic as well as a preparation method and application thereof. The toughened honeycomb ceramic is prepared by mixing, kneading, refining, drying and sintering a mixed ceramic raw material and an additive, the additive accounts for 4-12wt% of the weight of the mixed ceramic raw material, and the additive comprises yttrium-stabilized zirconia and nickel-titanium memory alloy in a mass ratio of (1-3): (1-3). According to the method, plastic deformation of the memory alloy is induced by utilizing the volume change of the instantaneous phase change of the yttrium-stabilized zirconia when the crack is generated, and the damage accumulated in the ceramic at the low-temperature stage can be partially recovered by utilizing the memory effect and the hyperelastic effect of the memory alloy. And a dual protection mechanism of instantaneous energy consumption and hysteresis recovery is constructed, and the damage resistance and toughness of the material are remarkably improved.

The utility model discloses a toughened impact-resistant ceramic structural part which comprises a ceramic base body, a positioning frame installed on the outer wall of the ceramic base body, high-strength fibers filled in the ceramic base body, a nano-particle layer installed in the ceramic base body, a honeycomb supporting layer installed in the ceramic base body and a microcrack layer installed in the ceramic base body. A layered gradient structure layer is installed in the ceramic base body. The utility model relates to the technical field of ceramic structural parts. According to the toughened impact-resistant ceramic structural part, the honeycomb supporting layer arranged in the ceramic base body is mainly internally provided with a honeycomb porous frame, impact energy is absorbed through hole wall deformation, the overall impact resistance of the ceramic base body can be mainly improved, and the layered gradient structural layer and the bionic shell pearl layer structure arranged in the ceramic base body can improve the impact resistance of the ceramic base body. According to the layered gradient structure layer, the high-strength Al2O3 layer and the ductile layer such as metal or polymer are alternately stacked, damage is delayed through interface stripping and crack bifurcation, and the impact strength of the ceramic matrix can be improved.

This invention discloses a method for preparing impact-resistant and cold-resistant polyvinyl chloride (PVC) conduit, belonging to the field of PVC material technology. In this invention, butyl rubber is complexed with dioctyl sebacate and active silica under the initiation of tert-butyl hydrogen peroxide. This complex acts as a flexible dispersed phase in the PVC matrix, effectively absorbing and dissipating impact energy and lowering the glass transition temperature of the material. This allows the conduit to maintain excellent toughness and crack resistance even at low temperatures. Furthermore, it works synergistically with impact modifiers in the system. Ethylene-vinyl acetate copolymer provides elastomer toughening, while maleic anhydride-styrene graft copolymer acts as a highly efficient compatibilizer and interfacial reinforcing agent. The compounded structure forms a toughening network, achieving toughening from molecular chain segment movement to microstructure, thus improving impact strength. Subsequent addition of reinforcing fibers of the same specification further enhances the strength of the conduit. Overall, this results in a PVC conduit with excellent strength, impact and cold resistance, and thermal properties.

This invention belongs to the technical field of concrete crack filling materials, specifically relating to a rapid repair material for concrete cracks, comprising component A and component B. Component A contains liquid bisphenol A epoxy resin, filler, toughening agent, and anti-settling agent; component B includes a curing agent and a diluent. The curing agent is prepared by pre-reacting a polyamine, epoxy compound, and benzyl alcohol, followed by mixing with isocyanate. This invention has found that the synergistic effect of components A and B significantly improves the performance of the rapid repair material for concrete cracks. The research shows that this rapid repair material exhibits rapid strength growth at low temperatures, fast gel time, compressive strength greater than 50 MPa at 2 hours, flexural strength greater than 12 MPa at 24 hours, adhesive strength greater than 3.0 MPa, and the ability to open to traffic after 2 hours, with subsequent slow strength growth.

This invention discloses a water-based epoxy resin coating for 6005 aluminum alloy that prevents sagging and cracking, and its preparation method. The coating is a two-component system. Component A contains water-based epoxy resin emulsion, CTBN-modified toughening resin, composite anti-rust pigments, flake-shaped shielding fillers, and compounded thixotropic rheology agents, etc. Component B is a water-based amine curing agent. This coating can solve the sagging and cracking problems of existing coatings on 6005 aluminum alloy, achieving a coating adhesion grade of 0, a neutral salt spray test of ≥900h, and VOC ≤42g / L. It meets the stringent protection requirements of 6005 aluminum alloy and has excellent prospects for industrial application.

This invention discloses a low-temperature resistant plastic bucket and its preparation method, belonging to the field of plastic bucket technology. This invention utilizes the synergistic effect of maleic anhydride-grafted ethylene-octene copolymer, nano-aluminum nitride, and cold-resistant toughening agent, combined with gradient injection molding, gradient annealing, and low-temperature aging processes to eliminate internal stress in the product. This allows the product to possess excellent tensile strength, flexural strength, and drop resistance reliability at -10℃. Under full load, the drop height can reach 1.2m without cracking or leakage. The synergistic effect of each component achieves a balance between low-temperature toughness and structural strength, significantly improving the stability and service life of the plastic bucket under low-temperature conditions.

This invention discloses a rapid-hardening, high-toughness shotcrete and its spraying construction method, belonging to the field of concrete material technology. It employs a technical route of multi-component synergistic rapid-hardening – modified hybrid fiber toughening – three-stage synergistic expansion – three-phase distribution spraying method. The shotcrete material consists of powder, graded fine aggregate, polymer, high-performance liquid accelerator, and water. The graded fine aggregate forms a riprap skeleton; the high-belite aluminum sulfate cement and silicate cement compound lay the foundation for rapid hardening; the modified hybrid fibers construct a three-dimensional reinforcing network to achieve high toughness and crack resistance; the multi-component composite expansion agent compensates for shrinkage throughout all ages; and the micro-nano active admixtures and polymer optimize interfacial bonding performance. It is complemented by high-pressure airflow cleaning / nano-silicon ion impregnation of the substrate and a three-phase distribution spraying method of rapid-hardening cement paste – graded fine aggregate – liquid accelerator. The concrete of this invention combines rapid hardening, high strength, and high toughness and crack resistance, shortening response time and improving construction efficiency.

The application relates to the field of glass, in particular to an anti-impact glass and a preparation process thereof. The anti-impact glass is prepared by using ceramic micro-powder with a crystal structure in raw materials, the ceramic micro-powder with the crystal structure is evenly distributed in the non-crystal structure of the anti-impact glass, and the ceramic micro-powder is used in combination with alumina and zirconia with good toughening effect in the raw materials of the anti-impact glass, so that the synergistic performance between the crystal structure of the ceramic micro-powder and the non-crystal structure in the anti-impact glass is improved, and then the ceramic micro-powder can better absorb impact energy and reduce crack propagation under the action of impact force on the anti-impact glass, and the anti-impact performance of the anti-impact glass is improved.

The invention provides a method and a system for predicting post-impact compression residual strength of an intercalation toughened composite material, and belongs to the technical field of electric digital data processing. According to the method, the interlayer fracture toughness is measured through a test, a finite element model is established, and initiation and evolution of intra-layer and interlayer damage are accurately captured by adopting a progressive damage theory in combination with a Hashin criterion and a cohesion method; after the impact, extracting a damage state variable of each unit, importing a deformation grid into a compression model, and synchronously reducing modulus, strength and fracture energy based on the damage variables to construct a high-precision post-damage material constitutive; and finally, obtaining the residual intensity through compression simulation. According to the method, initial oscillation and residual stress interference in a traditional restart method are avoided, automatic damage mapping and performance reduction are achieved through the Python script, the calculation efficiency and universality are remarkably improved, and a reliable simulation tool is provided for optimization design of the toughening layer.

The invention discloses a composite plugging material for a high-temperature-resistant fracture stratum and an implementation method of the composite plugging material. The composite plugging material is prepared from a base material, a flexibilizer, a high-temperature stabilizer, a plugging agent, a curing accelerator and an interface enhancer, the implementation of the composite leaking stoppage material is completed through four stages of single agent preparation, leaking stoppage slurry preparation, stratum injection and curing packing. The composite leaking stoppage material disclosed by the invention can keep a stable structure at a high temperature of 150-220 DEG C, and has excellent leaking stoppage sealing property, interface cohesiveness and toughness; the preparation process of each single agent for forming the composite plugging material is mature, special equipment is not needed, and industrial mass production can be realized; the field application process is compatible with existing drilling equipment, operation is easy, the construction period is short, and the drilling cost is reduced.

The invention provides a high-shock-resistance low-precipitation phosphate ceramic structure adhesive which comprises the following components in parts by weight: 100 parts of aluminum dihydrogen phosphate, 8-15 parts of zinc oxide powder, 35-45 parts of flaky aluminum oxide powder, 5-10 parts of nano zirconium oxide powder and 0.5-2 parts of layered zirconium phosphate powder. The ceramic further comprises 0.5-2 parts of titanium oxide powder and 5-10 parts of spherical aluminum oxide powder. The invention also discloses a preparation method and application of the adhesive. The adhesive disclosed by the invention can work for a long time at 500 DEG C or below, has high strength retention rate at high temperature, and solves the problem of easy failure at high temperature; through the toughening design, the impact resistance and thermal shock resistance are remarkably improved, and cracking in use is effectively prevented; the paint has good stability to acid, alkali, solvents and other chemical media, and is suitable for partial corrosive environments; the ion precipitation rate is extremely low, and the strict requirements of the fields of biological medicine, food and the like on the material purity are met; and the curing temperature is moderate, a precise matrix is not easy to damage, and on-site construction and complex structure bonding are facilitated.

The utility model relates to the technical field of underground engineering, in particular to an underground engineering toughness supporting structure and underground engineering. The tough supporting structure for the underground engineering comprises a surrounding rock toughening layer which is grouted or sprayed on surrounding rock of the underground engineering in a rotary mode; the fiber sprayed concrete primary support layer is sprayed on the excavation contour surface of the underground engineering; the anchor rod or the anchor cable is driven to the surrounding rock of the underground engineering from the fiber sprayed concrete primary support layer; the telescopic arch frame is erected in the fiber sprayed concrete primary support layer; the buffer layer is laid or sprayed on the inner side of the fiber sprayed concrete primary support layer; and the self-repairing secondary lining layer is laid on the inner side of the buffer layer. A traditional passive supporting technology is changed, the toughness of the supporting structure is systematically improved in the mode of structural toughening, active supporting and graded deformation, and the whole structural system is better in deformation adaptability, higher in bearing capacity and higher in disaster resistance.

The present application relates to autoclaved aerated concrete plate technical field, specifically to high toughness AAC plate with heavy metal solidification function and a preparation method thereof. The present application makes full use of the silicon dioxide in fluorite tailings, copper tailings and spodumene tailings as siliceous material, uses cement, quicklime and other alkaline materials as calcareous material, adds appropriate amount of aluminum powder paste and other gas forming agents as pore forming agent, appropriate amount of coagulation regulator, appropriate amount of nano Y type molecular sieve and high efficiency toughening agent, and through steam curing (temperature < 200 DEG C), the autoclave is discharged, and a kind of high toughness AAC plate with heavy metal solidification function is prepared.

The application discloses a kind of tee pipeline powder filling processing technology, including the following percentage of raw material composition: modified calcium carbonate 70~85%, polypropylene resin 10~25%, toughening agent 1.5~3.5%, coupling agent 1~2%, foaming agent 0.3~0.8%, antioxidant 0.3~0.7%, lubricant 0.3~0.7%;The processing technology includes the following steps: S1, tube blank straightening cutting;S2, composite powder medium preparation and filling;S3, multi-stage cold extrusion forming;S4, extension section sawing;S5, filling medium removal;S6, post-processing.By using modified calcium carbonate, polypropylene resin as main raw material, and the proportion of auxiliary reagent such as toughening agent, coupling agent, effectively improve the support force and fracture resistance of composite filling powder to tee pipeline;By using subsection gradient pressurization, mold partition temperature control combination integrated process, the corresponding mold area of tee pipe main pipe, branch pipe, connecting extension section is differentially pressurized and temperature controlled.

The present application belongs to the technical field of bridge engineering repair materials, and particularly relates to a kind of cement joint repair materials, preparation method and application.The repair material comprises component A and component B;component A comprises epoxy resin, modified epoxy polymer, ester diluent, surfactant and defoaming agent;component B comprises composite amine curing agent, modified rubber elastomer, accelerator and coupling agent;the mass ratio of component A and component B is 100:(30-35) by mass fraction.The dual toughening mechanism of modified epoxy polymer and modified rubber elastomer is adopted, the elongation of the material after curing is greater than or equal to 50%, which can adapt to the joint deformation caused by bridge dynamic load and avoid secondary cracking caused by rigid curing.The interfacial bonding strength between the repair material and concrete is high, the split tensile strength of the cement joint is greater than or equal to 3.0MPa, cohesive failure is realized, and the integration of the repair layer and the matrix is ensured.

The invention discloses anti-crack concrete and a preparation method thereof, and belongs to the technical field of concrete materials. The anti-crack concrete is prepared from the following raw materials in parts by weight: 300 to 500 parts of cement, 900 to 1200 parts of coarse aggregate, 600 to 800 parts of fine aggregate, 15 to 40 parts of admixture, 3 to 10 parts of water reducing agent, 20 to 50 parts of composite fiber reinforcing agent, 10 to 20 parts of filler, 1 to 3 parts of internal curing agent and 140 to 180 parts of water. The composite fiber reinforcing agent is formed by compounding basalt fibers and modified cotton stalk fibers according to the mass ratio of 1: (4-6). Through the triple effects of synergistic toughening of the composite fibers, microstructure compactness of the functional filler and continuous moisturizing of the internal curing agent, the obtained concrete has excellent crack resistance and excellent durability while maintaining good construction workability, and comprehensive improvement of the crack resistance is achieved.

The invention relates to the field of ceramic-based composite materials, and discloses a CMC (Carboxy Methyl Cellulose) composite material component adopting a heterogeneous layering infiltration process and a preparation method thereof, aiming at complex-shaped components such as aero-engine hot end components, SiC fiber layering of a thicker ceramic coating with an interface layer and a protective layer is adopted in a smooth transition area or a high-temperature area of the component; therefore, the interface layer and the SiC fiber are protected in a CMC composite material component forming process or in a service environment; in a complex profile / curved surface region where only limited interface toughening and corrosion protection are required, and in a region where a relatively low stress level or temperature environment is provided, SiC fiber layup with only an interface layer or a thinner ceramic coating of an interface layer and a small-thickness protective layer is employed to provide weak interface bonding, such that the thickness of the interface layer is less than the thickness of the protective layer. Therefore, toughening mechanisms such as crack deflection and fiber pulling-out are realized. According to the method, the designability of the layering structure CMC can be fully exerted, and the CMC composite material can achieve cooperative improvement of the complex structure forming manufacturing performance and the service performance on the whole.