10results about How to "Delayed expansion" patented technology

The invention provides toughened anti-cracking and anti-corrosion solid waste concrete and a preparation method thereof. Mixing the cement, the fly ash, the slag and the natural aggregate; sequentially adding water, a weakly alkaline regulator and an additive solution containing a polycarboxylic acid water reducer to obtain concrete slurry; and curing to obtain the product. According to the invention, fly ash, slag solid waste and natural aggregate are used as aggregate, a water reducer is added to reduce the water consumption of concrete and improve the fluidity of concrete, and specially-made weakly-alkaline conditioning agent particles are introduced, so that the self-water-absorption-water-release behavior and bridging effect of the particles are utilized to improve the concrete fluidity. The early-stage and later-stage continuous hydration ability of a rubber material in the concrete is enhanced, the self-shrinkage and drying shrinkage resisting effects are achieved, the compactness and corrosion resistance of the concrete are improved, and then the anti-cracking ability of the all-solid waste concrete is improved. The surface of an obtained test piece is free of cracks, the 28d compressive strength reaches 46.6 MPa, the 28d breaking strength reaches 8.5 MPa, the self-shrinkage rate is 0.035%, and the drying shrinkage rate is 0.01%.

The invention is suitable for the technical field of automation equipment control and path planning, and provides a wafer extraction path optimization method based on adaptive heuristic and hierarchical search, comprising the following steps: Step 1, initialization; step 2, heuristic value calculation: calculating an adaptive heuristic function value according to the current node to guide search; step 3, judging whether an end point is reached or not; step 4, path cost calculation is carried out; step 5, judging node expansion: judging whether to expand a current node according to a self-adaptive expansion condition, and preferentially expanding a node which is most likely to approach an end point; step 6, layered search of paths: layered search is carried out gradually from the outer layer to the inner layer, independent path planning is carried out on each layer, and the search range is reduced; step 7, path backtracking is carried out; step 8, updating a search area; step 9, continuing or terminating the search; and step 10, outputting a result. On the premise of ensuring the shortest path, the start-stop frequency of the motor is reduced, the operation efficiency of automatic equipment is improved, the service life of the equipment is prolonged, and the energy consumption is reduced.

The application discloses an environment-friendly rubber composite material and a preparation method and application thereof, and relates to the technical field of tire rubber materials.The environment-friendly rubber composite material comprises, in parts by mass, 100 parts of a rubber matrix, 10-60 parts of a bio-based filler, 0.5-10 parts of an interface modifier, 1-8 parts of a vulcanizing component and 0.5-5 parts of a crosslinking aid; wherein the rubber matrix comprises natural rubber and butadiene rubber; the bio-based filler comprises at least one of lignin, cellulose or a derivative thereof; the interface modifier comprises a compounded system of a silane coupling agent and a bio-based small molecule containing multiple functional groups; and the crosslinking aid comprises a borate compound and a low-molecular polymer containing a dynamic hydrogen bond structure.The application also provides a preparation method and application of the material.The application improves the proportion of the bio-based material, improves the long-term stability of the interface between the bio-based filler and the rubber matrix, reduces the interface damage accumulation and dynamic heat generation under the action of cyclic load, and improves the fatigue performance and comprehensive service performance of the rubber composite material.

The invention discloses a preparation method for constructing a multistage micro-nano heterostructure based on combination of a laser melting deposition process and a laser shock peening means, which comprises the following steps of: printing by using dry TC4 alloy powder, accumulating a printed TC4 metal printing layer to form a TC4 metal micron layer, performing low-power laser shock peening on part of the TC4 metal micron layer to form a TC4 metal submicron layer, and forming the multistage micro-nano heterostructure. A TC4 metal printing layer is printed on the submicron layer and subjected to high-power laser shock peening to form a TC4 metal nano layer, a TC4 metal printing layer is printed on the nano layer and subjected to low-power laser shock peening to form a TC4 metal submicron layer, printing and cyclic operation are continued on the submicron layer to form a sample, and the sample is obtained through annealing treatment. According to the preparation method disclosed by the invention, a micron layer-nano sandwich composite layer-micron layer multi-stage micro-nano heterostructure is formed, crack propagation is effectively hindered, and the elongation of the material is improved, so that alloy strength and plasticity synergistic strengthening is realized.

The invention discloses a nickel-based tungsten-doped high-temperature self-lubricating material and a preparation method thereof. The method comprises the steps that firstly, tungsten powder is pretreated through aqua regia and then poured into electroplating liquid to be subjected to ultrasonic mixing, and nickel-plated tungsten powder is prepared; 2, the nickel-plated tungsten powder, nickel powder, molybdenum powder, rare earth yttrium powder and calcium fluoride are proportioned and weighed, and composite material raw powder is obtained; 3, pouring the composite material raw powder into an ethanol solution, mixing, stirring and drying to obtain composite powder; 4, carrying out ball milling on the composite powder to obtain uniform composite powder; and 5, carrying out plasma sintering on the composite powder to obtain the nickel-based tungsten-doped high-temperature self-lubricating material. According to the nickel-based tungsten-doped high-temperature self-lubricating material, the Ni-Mo alloy serves as a base body, the high-temperature strength, hardness, abrasion resistance and self-lubricating performance of the nickel-based tungsten-doped high-temperature self-lubricating material are improved by adding the nickel-plated tungsten powder and the rare earth Y, CaF2 is introduced to serve as a composite lubricant, the self-lubricating effect is enhanced, spark plasma sintering is combined, the compactness of the material is improved, and the service life of the material is prolonged. The method is suitable for aerospace, high-speed carrying and other fields.

The invention discloses a geometric guidance and task self-adaption multi-thread sphere decoding method and a related device, and belongs to the technical field of wireless communication, and the method comprises the steps: obtaining a channel matrix of a system model, and carrying out the QR decomposition of the channel matrix of the system model, and obtaining a QR decomposition result; constructing a search tree based on a result of the QR decomposition; dynamically updating the search radius and the optimal solution of the search tree, and determining a geometric threshold value; according to the search radius and the optimal solution of the updated search tree and the determined geometric threshold value, searching the search tree through multiple threads according to an SE sequence to obtain a symbol vector of a transmitting antenna in a system model, and completing multi-thread sphere decoding of geometric guidance and task self-adaption. Meanwhile, the search time is shortened, and the search task scheduling and synchronization cost is reduced.

The application discloses basalt fiber seawater and sea sand concrete and a preparation method and application thereof, and belongs to the technical field of building materials. The basalt fiber seawater and sea sand concrete is composed of the following components in parts by mass: cement 35-45 parts, sea sand 65-75 parts, gravel 105-120 parts, seawater 15-20 parts, water reducing agent 0.1-0.3 parts and basalt fiber 0.1-1 part. The raw material selection and mix proportion design improve the toughness and crack resistance of traditional concrete. The SEM result shows that the basalt fiber is mixed in the seawater and sea sand concrete, the fiber 'bridges' the cracks and improves the pore connection state, which is beneficial to improving the crack resistance, toughness, salt and alkali environment applicability and residual mechanical properties after high temperature, and the basalt fiber seawater and sea sand concrete can be used for a coastal tunnel shield segment, a FRP concrete structure and repair of existing structures in a marine environment.

This invention discloses a FRP-concrete composite beam with built-in damage self-monitoring and its construction method, belonging to the field of civil engineering structural technology. The composite beam includes a concrete slab, an FRP profile, a shear reinforcement layer, intelligent connectors, and a protective shell. The intelligent connectors penetrate the shear reinforcement layer and are anchored to the FRP profile. Strain sensing elements are embedded internally, and driving elements are externally located. When the preload of the connector decreases, the driving elements actively extend to restore the preload. The shear reinforcement layer is a perforated plate filled with a tough material to enhance the shear resistance of the interface. The protective shell is a U-shaped precast concrete shell that wraps around the FRP web, providing lateral restraint and protection. This invention achieves real-time monitoring of FRP-concrete interface damage and automatic preload compensation, significantly improving the shear performance, integrity, and durability of the structure. It has advantages such as self-sensing, self-repair, and easy construction, and is suitable for long-span bridges, marine engineering, and intelligent building structures.

The invention relates to the technical field of carbon fiber reinforced resin-based composite materials, in particular to a prefabricated interlayer toughening structure-based high-speed impact resistant carbon fiber / resin composite material integral forming simple preparation process, which comprises the following steps of: placing a prefabricated interlayer toughening structure between adjacent carbon fiber cloth layers coated with phenoxy resin modified epoxy resin glue solution; and finally, carrying out integral hot-press molding. The prefabricated interlayer toughening structure is obtained by impregnating a chopped fiber felt with a phenoxy resin modified epoxy resin glue solution and performing prepolymerization under heating and pressurizing conditions. According to the invention, the chopped fibers are introduced into the interlayers of the carbon fiber / resin composite material in the form of a prefabricated interlayer toughening structure, and the problem that the chopped fibers are not uniformly distributed in the interlayer area can be effectively solved without changing the original preparation process of the composite material. In addition, through the synergistic effect of phenoxy resin and chopped fibers, stress transfer between layers of the carbon fiber / resin composite material can be more uniform and effective, and crack propagation can be delayed through bridging, deflection and other toughening mechanisms.