223 results about "Bituminous materials" patented technology

The invention discloses an asphalt material healing and cracking performance detection method and system based on dynamic surface energy parameters, and particularly relates to the technical field of asphalt material detection. The method comprises the following steps: acquiring a surface energy parameter change curve and an initial surface energy parameter of an asphalt material under the action of different environmental conditions, and calculating in combination with an interface energy change rate in a time step to obtain a dynamic healing ability index and a cracking sensitivity index; in addition, finite element simulation is combined with environment load interaction analysis, the healing and cracking critical value of the material is calculated, and durability prediction parameters are further determined; on the basis, calculating a dynamic healing rate and a crack growth rate, and comparing the dynamic healing rate and the crack growth rate with actually measured cracking conditions under different working conditions so as to optimize a surface energy evolution model; the method can accurately evaluate the healing and cracking behaviors of the asphalt material in a complex environment, optimizes the material formula, improves the durability and service life of a road structure, and provides a scientific basis for engineering application.

The invention relates to the technical field of asphalt material preparation, in particular to a cold-mixing and cold-spreading waterborne acrylic hybrid epoxy environment-friendly asphalt material preparation process which comprises the following steps: physically mixing waterborne acrylic emulsion and waterborne epoxy emulsion to obtain waterborne acrylic hybrid epoxy emulsion; adding the asphalt pavement milling material and an activating agent into vibration stirring equipment, and stirring to obtain an activated milling material; after the activated milling material is obtained, continuously adding the water-based acrylic hybrid epoxy emulsion, the curing agent and the cold-mixed asphalt modifier into the vibration stirring equipment, and stirring and coating at normal temperature; pure water is added into the vibration stirring equipment, and the torque of the vibration stirring equipment and the temperature of the asphalt mixture are collected within a preset time period after the pure water is added; determining a local coating non-uniform evaluation value and a viscosity evaluation coefficient of the asphalt mixture; the curing reaction in the vibration stirring equipment is regulated and controlled, and the prepared asphalt material is obtained. The mechanical property of the prepared asphalt material is improved.

The invention discloses an asphalt material anti-rutting performance prediction and design optimization method based on data driving, which comprises the following steps: sorting and preprocessing data obtained by a dynamic shear rheometer test of a rubber powder / SBS composite modified asphalt material with various contents in different aging states, and calculating the rutting resistance of the asphalt material by adopting a grey correlation analysis method; screening the data set based on a gray analysis result, and determining input and output of a prediction model; three machine learning models of GPR, LSBboost integration and ANN are established, the deformation resistance of the asphalt material is predicted, a better model is obtained through multi-index comparison, and the prediction result of the optimal model is explained based on SHAP; and based on the optimal prediction model, performing targeted design optimization on the formula of the asphalt material by using a Bayesian optimization algorithm, and simulating application requirements under different actual working conditions by limiting part of parameters in the formula. According to the invention, the test cost of the asphalt material in deformation resistance test and formula design is reduced.

The invention belongs to the technical field of lithium ion battery negative electrode materials and coated asphalt, and discloses a preparation method and application of a coating material easy to graphitize. The preparation method comprises the following steps: by taking one or more than two of petroleum residual oil, ethylene tar, medium and low temperature coal tar, coal pitch, petroleum pitch and maltha as raw materials, adding a blending solvent and a catalyst to obtain a blending raw material; the easily-graphitized coating material with relatively low interlayer spacing after carbonization is obtained by sequentially carrying out blending solvent compounding, boron doping and pressurized polymerization or sequentially carrying out blending solvent compounding, boron doping, pressurized polymerization, oxidation crosslinking and reduced pressure distillation / molecular distillation processes. The graphitization performance of the asphalt material is remarkably improved through boron doping, so that the asphalt material can form an ordered carbon layer structure at 1200 DEG C, carbonization shrinkage and microcrack generation are inhibited, and the compactness and uniformity of a coating layer are improved. The obtained coating material is suitable for the negative electrode of the lithium ion battery, and the first charge reversible capacity, the cycle stability and the rate capability of the battery can be improved.

The invention discloses a novel building waste asphalt material recovery device, relates to the technical field of building waste asphalt recovery, and provides the following technical scheme in order to achieve the purpose: the novel building waste asphalt material recovery device comprises a static jaw structure and a movable jaw structure which are arranged in a box body, the fixed inclined plate and the sliding inclined plate are arranged in the box body, and the sliding inclined plate slides up and down relative to the fixed inclined plate; the inclined plane sliding block mechanism is arranged between the fixed inclined plate and the sliding inclined plate in a sliding manner; the inclined plane sliding block mechanism longitudinally slides to drive the sliding inclined plate to transversely slide; the sliding inclined plate is connected with the wedge block through the sliding block and the sliding groove, up-and-down sliding of the wedge block is transmitted to the sliding inclined plate through the sliding block and the sliding groove, the wedge block is made to move transversely, and then the crushing gap between the static rack and the movable rack is changed; therefore, the device adapts to waste asphalt materials with different particle sizes.

The invention discloses a modified asphalt material and a preparation method and application thereof, the Marshall stability and the flow value of a modified asphalt mixture prepared from the modified asphalt material respectively exceed 20 kN and 44 (0.1 mm) after curing, the low-temperature bending strain value of the modified asphalt mixture exceeds 4100 mu epsilon after curing, the dynamic stability (high-temperature stability index) of the modified asphalt mixture exceeds 17000 times / mm after curing, and the dynamic stability (high-temperature stability index) of the modified asphalt mixture exceeds 8000 times / mm after curing. The strength at low temperature and normal temperature is increased quickly, the deformation characteristic and impact toughness are excellent, and the purpose of opening traffic quickly can be achieved.

The invention belongs to the technical field of asphalt preparation, and provides a high-modulus composite modified asphalt material based on natural asphalt and a preparation method thereof. The method comprises the following steps: separating natural asphalt into a high-molecular asphaltene section and a medium-low-molecular colloid section, and preparing activated asphaltene and colloid sections through alkali treatment and spray drying; a styrene-butadiene-styrene block copolymer and a polyurethane prepolymer are taken as the basis, and a dynamic cross-linked polymer is synthesized through the steps of hydrazide treatment, boric acid group introduction, glutaraldehyde cross-linking and the like; organic modified clay and phenylated chitosan are prepared, a polyaniline composite material is prepared through in-situ polymerization of aniline, a PANI-clay-biomass compound is obtained, the ultraviolet absorption characteristic of polyaniline and the shielding effect of montmorillonite cooperate, the ultraviolet aging resistance of the material is improved, through multi-stage temperature control dispersion, the anti-aging performance of the material is improved, and the anti-aging performance of the material is improved. The various modified materials are compounded with a natural asphalt substrate to obtain the high-modulus composite modified asphalt material based on the natural asphalt.

The invention discloses a method for evaluating the asphalt adsorption performance of a solid waste powder material, and relates to the technical field of evaluation of the adsorption performance of the powder material on an asphalt material.The method comprises the steps that the solid waste powder material is treated, and the non-agglomerated accumulation state of a powder material asphalt adsorption performance characterization quantitative test piece is obtained; collecting solid waste powder particles with different asphalt adsorption capacities, and preparing a separated state of the powder material asphalt adsorption performance characterization quantitative test piece; screening solid waste powder particle test pieces with asphalt adsorption performance; and obtaining the asphalt adsorption mass of a single particle, determining the effective adsorption area of the solid waste powder material, and calculating adsorption parameters to evaluate the adsorption performance of the solid waste powder material on the asphalt. The method can quantitatively evaluate the adsorption performance of the solid waste powder material to the asphalt, so that quantitative analysis on the adsorption efficiency and interaction degree of the solid waste powder material and the asphalt cement is realized.

The invention relates to the technical field of pavement materials, in particular to an all-solid-waste imitation asphalt material as well as a preparation method and application thereof. The all-solid-waste asphalt-imitating material is prepared from the following raw material components: waste rubber powder, waste plastics, kitchen waste grease, waste petroleum resin and waste filler, wherein the waste filler is prepared from the following raw material components in percentage by mass: 20 to 30 percent of waste glass fiber, 15 to 20 percent of straw residue, 15 to 20 percent of spent bleaching clay and the balance of coal gangue powder. The all-solid-waste asphalt-imitating material provided by the invention has excellent pavement performance, and the raw material components are wastes, so that the preparation cost is low, the raw material components are easy to obtain, and the treatment pressure of the wastes can be effectively relieved. According to the technical scheme, the problems that in the prior art, the preparation cost of an imitated asphalt material is high, and the material performance cannot reach the traditional asphalt level, so that the mechanical performance of an imitated asphalt mixture prepared from the imitated asphalt material is poor are effectively solved.

The invention discloses an insect-repelling environment-friendly microcapsule, an insect-repelling environment-friendly asphalt additive and a preparation method of the insect-repelling environment-friendly microcapsule. A shell material of the insect-repelling environment-friendly microcapsule is a composite shell material containing silicon dioxide / nano tourmaline, and a core material of the insect-repelling environment-friendly microcapsule comprises one or more of a pyrethroid compound, a carboxylic ester compound, an amide compound and a plant extract; a metal chelate is loaded on the surface of the shell material. The insect-repelling environment-friendly microcapsule disclosed by the invention not only can efficiently and durably repel insects around a road, but also can effectively inhibit the amount of pollutants generated by the asphalt under the action of high temperature in the production, construction and pavement application processes, and provides a brand new idea for functional utilization of asphalt materials.

The invention provides a visual observation test system for eroding a road asphalt material in a dynamic water pressure environment, and relates to the technical field of road engineering monitoring. The system comprises a dynamic water pressure environment bin, a transparent closed observation bin, a transparent storage rack and a pipeline connecting piece, a water outlet of the dynamic water pressure environment bin is connected with a water inlet of the transparent closed observation bin through the pipeline connecting piece, the transparent storage rack is arranged in the transparent closed observation bin, and a sample is placed on the storage rack; high-precision cameras are arranged on the top and the side faces of the transparent closed observation bin, a temperature sensor, a water pressure sensor and an exhaust valve are arranged on the top, and bulbs are arranged around the transparent closed observation bin. The system breaks through the limitation that in the prior art, a dynamic water pressure environment can only be simulated and generated in a closed container invisible to naked eyes, and the material degradation process is not clear, and comprehensive revelation of the water damage evolution law and the damage mechanism of gradual collapse of the road asphalt material is achieved. And a foundation is laid for long-life design and toughness improvement of the multi-physics coupling asphalt pavement.

The invention discloses waste rubber-plastic composite modified asphalt as well as a preparation method and application thereof, and relates to the technical field of modified asphalt materials, the waste rubber-plastic composite modified asphalt comprises the following components in parts by weight: 90-115 parts of matrix asphalt, 30-45 parts of a modified rubber-plastic composite material, 1-5 parts of naphthenic rubber oil and 0.2-0.7 part of sulfur. According to the invention, a CO2 supercritical fluid carrying ionic liquid swelling treatment process and a microwave plasma treatment process are mainly adopted to carry out combined synergistic treatment on the rubber-plastic mixture, so that the problem that the storage stability, the temperature resistance and the like of the rubber-plastic mixture in asphalt are obviously reduced due to overhigh doping content is effectively solved; on the premise of ensuring that the performance of the asphalt required by the road engineering material meets the standard, the recycling rate of the waste rubber powder and the waste plastic is remarkably improved, and a new means is provided for preparation of the modified asphalt and cyclic utilization of waste resources.

The invention discloses anti-aging modified asphalt and a preparation method thereof, and relates to the technical field of building materials, the anti-aging modified asphalt comprises the following specific components: base petroleum asphalt, a thermoplastic elastomer, an anti-stripping agent, an ultraviolet absorbent, an antioxidant and a softening agent; the additive comprises a nano montmorillonite modifier, a phosphate type flame-retardant anti-aging agent, a bio-based polyphenol antioxidant, a siloxane graft polymer and a carbon quantum dot light stabilizer; the preparation is performed based on the components. On the basis of a traditional modification system, multiple additives are cooperatively introduced, and a composite system with multiple shielding, free radical scavenging, weather-proof protection and macromolecule enhancement functions is constructed. According to the modification system, the high-temperature stability, the low-temperature flexibility and the water resistance of the asphalt material are remarkably improved on the macroscopic level, and meanwhile the aging process of the material is greatly delayed through the nanoscale barrier effect, the long-acting anti-oxidation mechanism and the light stabilization mechanism on the microscopic level.

The invention relates to an asphalt-based composite hard carbon material and a preparation method thereof. The hard carbon material is prepared from the following raw materials: asphalt, a solvent A and a solvent B, the preparation method comprises the following steps: crushing the asphalt; then carrying out pre-oxidation crosslinking treatment; then washing and removing impurities; mixing the pre-oxidized asphalt with a solvent A and a solvent B to embed molecules of the solvent A into graphite layers of the pre-oxidized asphalt; then, the asphalt is dried in a segmented drying mode; and finally, carrying out carbonization treatment under an inert protective atmosphere or a vacuum condition, and cooling to room temperature to obtain the asphalt-based composite hard carbon material. Oxidized and crosslinked asphalt is mixed with an embedded solvent, part of solvent molecules are embedded into a graphite microcrystal part of an asphalt material by wet ball milling or soaking, and a carbon layer in a microcrystal region and the content of oxygen-containing functional groups are increased through the embedded solvent, so that a sodium ion diffusion channel is expanded, and the composite material has relatively high reversible specific capacity; and the high-performance composite hard carbon negative electrode material can be obtained.

The invention provides an asphalt material softening point prediction modeling method based on an infrared spectrum, and belongs to the technical field of road engineering material performance prediction. The method comprises the following steps: collecting infrared spectrum data of a multi-source asphalt sample and carrying out standardization pretreatment; fusing and extracting functional group quantitative features, wavelet multi-scale features and principal component dimension reduction features; constructing a high-stability feature subset by adopting a progressive feature optimization strategy guided by a physical mechanism; a self-adaptive Stacking fusion model is constructed and trained, the model integrates four base learners including PLSR, SVR, random forest and gradient boosting regression, and Bayesian ridge regression is used as a meta-learner to realize uncertainty quantification of a prediction result. The method can quickly output the predicted value of the softening point without a physical test, solves the technical problems of low efficiency and poor consistency of a traditional method, and is suitable for production quality control, on-site quick detection and formula optimization of asphalt materials.

The application relates to the technical field of composite asphalt materials, in particular to a composite asphalt material based on modified SBS and a preparation method thereof, which comprises the following steps: S1. After heating, base asphalt is added with aromatic oil, and stirring is carried out for 15-20 min to obtain softened asphalt; S2. Preparation of modified SBS; S3. Modified SBS is gradually added into the softened asphalt, and shearing is carried out for 30-40 min; S4. Modified waste rubber powder is added, and after continuous shearing, sulfur is added, development is carried out at a rotating speed of 800-1000 rpm for 50-60 min, and the composite asphalt material based on modified SBS is obtained after standing and defoaming. Through the synergistic effect of modified SBS, modified waste rubber powder and modified additives, the synchronous improvement of high-temperature performance, low-temperature performance and fatigue resistance is realized, the performance attenuation rate of the composite asphalt material under the conditions of thermal oxygen aging and ultraviolet aging is reduced, and the service life of the asphalt pavement is prolonged.

The invention provides an antibacterial light-colored asphalt cement and a preparation method thereof, and relates to the technical field of asphalt materials. The anti-bacterial paint is prepared from the following raw materials in parts by mass: 34-41 parts of naphthenic oil, 44-50 parts of petroleum resin, 8-13 parts of an SBS polymer, 2-6 parts of diatomite and 20 parts of an anti-bacterial agent. A traditional black asphalt cement is replaced, the cement asphalt material has the coloring function, the technical requirements for high-temperature performance, low-temperature performance and anti-aging performance are met, the light-color asphalt cement is endowed with the antibacterial function, and the preparation method is simple.

The invention provides a built-in dynamic water pressure environment eroded asphalt material observation test device and method, and relates to the technical field of road engineering monitoring tests. An observation bin component, a sample containing bin component and a background light source bin component in the device are arranged from top to bottom, the observation bin component is sealed and enclosed by a stainless steel container B and a transparent quartz round cover B, and a miniature high-definition camera, an LED lamp strip and a mobile power supply are arranged in the observation bin component; the background light source bin component is sealed and enclosed by a stainless steel container A and a transparent quartz round cover A, and an LED background light source is arranged in the background light source bin component; the observation bin component and the background light source bin component are fixed through a screw and a supporting sleeve, and a space formed between the observation bin component and the background light source bin component is a sample containing bin component and is completely exposed in a dynamic water pressure environment. The device can be used for quickly and effectively observing and quantitatively analyzing the evolutionary law of the surface topography characteristics of the asphalt material by means of illumination and image acquisition, comprehensively reveals a water damage mechanism, and lays a foundation for long-life design and toughness improvement of a multi-physics coupling asphalt pavement.

The present invention relates to the technical field of asphalt material data processing, and in particular to a method for establishing an asphalt material database management system. The method comprises the following steps: using a scanning electron microscope, an atomic force microscope, and an X-ray tomography device to perform imaging scans on asphalt material samples of different gradations, different modifier types, and different aging states, respectively, to obtain multi-scale asphalt material microscopic image data; analyzing the microscopic characteristics of the material samples based on the pre-processed multi-scale asphalt material microscopic image data to obtain asphalt material microscopic characteristic parameters; and creating an asphalt material database management system for the asphalt material microscopic characteristic parameters based on a relational database management system. The present invention creates an asphalt material database for multi-dimensional query by efficiently associating the microstructure and macroscopic properties of asphalt materials, thereby achieving efficient storage and rapid query of asphalt material data.

The invention discloses a rigidity-toughness synergistic enhanced heavy-load pavement composite material and a preparation method thereof, and belongs to the technical field of asphalt materials. The composite material is prepared from the following raw materials: 100 parts of matrix asphalt, 35 to 40 parts of composite aggregate, 5 to 6 parts of nano silica sol, 1.5 to 2 parts of linear SBS (Styrene Butadiene Styrene), 8 to 10 parts of rubber powder, 2 to 4 parts of bio-based polymer, 1.5 to 2.5 parts of aluminum borate whisker and 0.2 to 0.8 part of nano silicon carbide modified basalt fiber. A nano-micron-macroscopic multi-scale material design is realized through a'rigid particle-whisker 'composite reinforced network formed by nano silica sol and aluminum borate, molecular chain entanglement of linear SBS and a bio-based polymer, a'hard core-soft shell structure' formed by rubber powder and composite aggregate and the like; and the synergistic improvement of rigidity, toughness and durability is realized.

An improved substantially solid brick of non-volatile bituminous material has a shape that is defined by an irregular outer surface to minimize surface contact with nearby bricks when shipped in bulk. The overall shape is preferably that of a modified tetrahedron having three non-planar face surfaces, a top surface, and a surface or point. Both the top and bottom surfaces are preferably modified domed shapes comprised of several sections. The face sections are preferably modified concave surfaces comprised of several triangular sections that can be planar, concave, or convex. The brick is partially or fully encased by a removable wrapper or removable wrapper segments and can further include a skeleton distributed throughout. The skeleton can be a customizable matrix, framework of fiber groups, or other structure and can include customizable buoyant features such as air pockets or capsules.

The present application relates to the field of image processing, in particular to an asphalt pavement damage visual analysis method and system integrating deep learning. It aims to solve the problem of misidentifying the asphalt pavement repair area as a crack in the prior art. An RGB image, a thermal image, a location and an environmental parameter are obtained by a vehicle-mounted device; local asphalt material properties are queried; an anti-interference fusion feature map is generated by fusing the RGB and thermal image features, combining the attention mechanism and the environmental parameter; an enhanced feature map is generated by adjusting the convolution kernel using the material properties through the MAML algorithm; and the damage is identified through the domain adaptive classifier and the adversarial training. The enhanced repair area and crack area differentiation ability reduces the misjudgment caused by environmental and regional material differences, and improves the identification accuracy and robustness.

The present invention discloses an asphalt layered melting method and a melting glue machine, belonging to the technical field of asphalt pretreatment, which includes the following steps: S1. Feeding: feeding sheet asphalt materials into the melting tank from the feed inlet; S2. Stirring: the sheet asphalt contacts the melted asphalt under the push of the stirring paddle, and continuous stirring makes the sheet asphalt and the melted asphalt evenly mixed; S3. Layered heating: the sheet asphalt is heated and melted by a heating element in the melting area of the upper layer of the melting tank, and after melting, the asphalt flows into the strong heating area of the lower layer of the melting tank, and the heating element in the strong heating area rapidly raises the temperature of the asphalt, and evenly heats the asphalt to the set discharge temperature; S4. Discharging: the asphalt is continuously stirred in the strong heating area, and is extruded and discharged by the stirring paddle in the strong heating area. While discharging, sheet asphalt materials are added to the melting tank for supplementation to keep the total amount of asphalt in the melting tank unchanged; S5. Circulation, the asphalt has high and uniform heating efficiency.

The present invention discloses a bio-based compatible stable particle, its preparation method and application, belonging to the technical field of road asphalt material preparation. A bio-based compatible stable particle, the raw materials of which include a thermally triggered bio-based crosslinking agent, a bio-based nanocomposite material, a tackifier, a titanate coupling agent and an antioxidant. The present invention uses a thermally triggered bio-based crosslinking agent and a bio-based nanocomposite material to replace the crosslinking agents such as sulfur and polyphosphoric acid commonly used in the prior art, and prepares them into bio-based compatible stable particles that can be directly put into use, having obvious advantages in material stability and construction convenience. The application of bio-based materials can effectively reduce the emission of harmful gases during the production and application of high-viscosity asphalt, and improve the construction environment. At the same time, the biodegradable characteristics of bio-based materials provide strong support for environmental protection, significantly reducing the long-term pollution risk after the use of materials.

The utility model provides a colored asphalt proportioning device. The colored asphalt proportioning device comprises a mounting seat; the two fixing plates are fixedly installed on the two sides of the top of the installation base correspondingly, and a stirring barrel is fixedly installed in the middle of the top of the installation base. According to the colored asphalt proportioning device provided by the utility model, the floating plate is arranged in the collecting barrel, and the display ring block is sleeved on the outer surface of the collecting barrel, so that the floating plate descends along with the liquid level height of a material along with the discharge of the material in the collecting barrel, and drives the display ring block to move on the surface of a scale value; the device is simple in structure, high in practicability and capable of visually observing the discharging volume of various mixed materials, the mixed materials can be stored in advance through the multiple collecting barrels, repeated manual discharging is not needed, the labor intensity of the operator is relieved, and the working efficiency is improved. The material mixing accuracy is improved, and the practicability of the device is improved.

The invention relates to the technical field of road engineering materials, in particular to a rock asphalt-interfacial activated rubber powder composite modified asphalt material and a preparation method thereof. The rock asphalt-interfacial activated rubber powder composite modified asphalt material is prepared from the following raw materials in percentage by mass: 4 to 6 percent of natural rock asphalt, 15 to 20 percent of rubber powder, 0.1 to 0.2 percent of silane coupling agent, 2 to 5 percent of light aromatic hydrocarbon oil, 0.1 to 3 percent of stabilizer and the balance of matrix asphalt. The material is prepared by co-doping raw material powder into matrix asphalt according to the mass fraction and adopting a step-by-step high-temperature high-shear process, and the composite modified asphalt with good compatibility and network structure stability is formed. The composite modified asphalt has the effects of high-temperature stability, low-temperature flexibility and uniform microstructure.

The invention discloses an epoxy modified colored asphalt material and a preparation method thereof. The epoxy modified colored asphalt material comprises the following raw materials in parts by weight: 100 parts of petroleum resin, 30-33 parts of hydroxyl-terminated long-chain silicone oil, 4-8 parts of an oxidizing agent, 6-9 parts of diol amine, 1-3 parts of a pH regulator, 5 parts of a solvent, 100 parts of normal hexane, 6-9 parts of a coloring agent, 6-9 parts of isocyanate, 1-3 parts of a catalyst, 26-28 parts of epoxy resin and 10-12 parts of an epoxy curing agent. The epoxy modified colored asphalt material prepared by the method disclosed by the invention has high and low temperature performance, high flexibility, cracking resistance, long durability and strong adhesion.

The invention discloses a lignin flame retardant with toughening and antioxidant functions, flame-retardant elements such as F-GMA, N, P and Si are introduced into a lignin macromolecular structure, the flame-retardant elements are not easy to migrate and seep, the performance of the material is more stable, the dispersity is better, the flame-retardant property of asphalt can be improved by the introduced flame-retardant elements such as N, P and Si, and meanwhile, the flame-retardant property of the asphalt can be improved by the introduced flame-retardant elements such as N, P and Si. The grafted F-GMA enables the lignin to have a toughening function, and meanwhile, the lignin has rich phenolic hydroxyl groups, so that the lignin also has an antioxidant function. When the lignin-based flame retardant is applied to an asphalt material, the flame retardant property of a composite material can be remarkably improved, and an efficient synergistic flame retardant effect is achieved. And the method for preparing the lignin flame retardant is simple, and the process conditions are easy to control.

This invention relates to the field of low-temperature performance characterization technology for asphalt materials, specifically to a method and system for evaluating the impact of physical hardening on the performance of asphalt materials. The method includes the following steps: obtaining the stiffness modulus and stiffness modulus change rate at different isothermal storage times under multiple test temperatures; obtaining stiffness modulus fitting parameters using a four-parameter saturated growth model fitted to the stiffness modulus, and obtaining stiffness modulus change rate fitting parameters using an exponential-logarithmic mixed model fitted to the stiffness modulus change rate; obtaining the physical hardening response rate and physical hardening rate using the stiffness modulus fitting parameters and the stiffness modulus change rate fitting parameters, respectively; obtaining the stiffness modulus critical temperature loss value and relaxation critical temperature loss value based on the stiffness modulus, the stiffness modulus change rate, and the low-temperature temperature loss model; and quantifying the response rate and degree of asphalt materials to physical hardening using multiple quantitative indicators.

The present invention relates to the technical field of material performance detection, and particularly to a microwave performance improvement system based on activated crumb rubber modified asphalt materials. The system includes a microwave irradiation condition design module, a performance detection and heat generation analysis module, a material microscopic influence evaluation module, and a material microwave performance improvement module. It can obtain different microwave irradiation powers and nano-zinc oxide compounding ratios, design microwave irradiation conditions, and detect microwave performance parameters to obtain microwave reflection coefficients, microwave transmission coefficients, and microwave absorption coefficients. By monitoring the microwave heat generation uniformity index in real time, analyzing the microscopic structure characteristics, and evaluating the influence on microwave performance, the corresponding material microscopic performance influence factors can be obtained. The microwave performance evaluation calculation and adaptive optimization adjustment are carried out on the microwave reflection coefficient, microwave transmission coefficient, and microwave absorption coefficient to generate a microwave performance improvement adjustment strategy corresponding to the modified asphalt material. The present invention can improve the microwave performance of the modified asphalt material.