138 results about "Asphalt mortar" patented technology

The present invention relates to a basalt fiber reinforced asphalt concrete, which includes: an asphalt material with a penetration grade between 40-300 at room temperature, selected from one of an asphalt mortar, an oil-soluble asphalt, an emulsified asphalt, and a modified asphalt; an aggregate having a first volume percentage between 50-80%; a basalt fiber reinforcement with a second volume percentage between 0.1-0.9%; and a chemical admixture for asphalt concrete used to adjust the properties of the basalt fiber reinforced asphalt concrete.

The invention belongs to the technical field of asphalt mixture strength prediction, and discloses an asphalt mixture strength prediction method and system based on discrete element method simulation. The method comprises the following steps: calculating a bearing capacity index of a compacted and formed asphalt mixture coarse aggregate contact network; establishing a relationship between the interlocking friction characteristic of the coarse aggregate and the high-temperature deformation resistance of the asphalt mixture; establishing an asphalt mortar compactness index calculation model; establishing an asphalt mixture strength prediction model considering a coarse aggregate interlocking friction effect and an asphalt mortar compaction effect; and verifying the reliability of the strength prediction model by adopting an asphalt mixture shear slip test. According to the method, the three-dimensional dynamic virtual compaction model is established through the discrete element method, the strength forming process of the asphalt mixture is accurately simulated, the microcosmic strength characteristics of the asphalt mixture are explored by combining the interlocking friction effect of the coarse aggregate and the bonding and filling effect of the asphalt mortar, and the strength prediction level of the asphalt mixture can be improved.

An evaluation method for new and old asphalt fusion of recycled asphalt mortar comprises the following steps: firstly, pulping oil-rich RAP fine materials subjected to refined separation and new asphalt, obtaining partially fused recycled asphalt mortar with different fusion degrees on site, and preparing completely fused recycled asphalt mortar for comparison; secondly, obtaining low-temperature rheological indexes at different temperatures by adopting a bending beam rheological test; drawing a low-temperature main curve according to the obtained low-temperature rheological indexes based on a time-temperature equivalence principle; and finally, evaluating the similarity between the low-temperature main curve of the mortar with different fusion degrees and the completely fused standard curve by adopting the Frechet distance, thereby serving as an evaluation method for new and old asphalt fusion of the recycled asphalt mortar. According to the method, the fusion degree of the new and old asphalt in the recycled asphalt mortar is evaluated through an in-situ technology, and the problems that an existing new and old asphalt fusion simulation test is not matched with the actual situation, an extraction test has negative effects on new and old asphalt fusion evaluation, and a microscopic test is high in price and not easy to operate are solved.

The invention discloses a load type regenerated asphalt mixture composite regenerant, which is composed of a porous carrier and a regenerant loaded in the pore channel of the carrier, and the mass ratio of the porous carrier to the regenerant is 5: 1. The regenerant is prepared from the following raw materials in parts by weight: 90 to 110 parts of furfural extract oil, 5 to 10 parts of triallyl isocyanurate, 2 to 6 parts of triethoxysilane, 4 to 10 parts of a three-dimensional porous material, 3 to 8 parts of a penetrant, 20 to 30 parts of toluene-2, 4-diisocyanate, 10 to 20 parts of hydroxyl-terminated polybutadiene, 5 to 12 parts of a plasticizer and 5 to 10 parts of a tackifier. The regenerant is loaded in pores of the porous carrier, so that the deformation resistance of asphalt mortar can be improved, the aging resistance of asphalt can be effectively improved, and the regenerant can improve the high-temperature stability, low-temperature stability and water stability of the thermally-regenerated asphalt mixture and can improve the skid resistance and sound absorption performance of the thermally-regenerated asphalt mixture. Meanwhile, the economic cost is saved.

The invention relates to a high-speed railway cement emulsified asphalt mortar mix proportion design method and system. The method comprises the following steps that design factors of cement emulsified asphalt mortar to be designed are input into a design model; the design factors comprise raw material types, usage and layout environment parameters; predicting and outputting a performance index corresponding to the to-be-designed cement emulsified asphalt mortar through the design model; the performance indexes comprise fluidity, expansion degree, working time, compressive strength, elasticity modulus and fatigue life; according to the performance indexes, the design factors of the cement emulsified asphalt mortar to be designed are adjusted and input into the design model, and the performance indexes corresponding to the adjusted design factors are obtained; and repeating the step of inputting and adjusting for multiple times until the optimal design factor meeting the performance requirement is obtained and output. The system and the equipment are used for executing the method. The method has the advantages of high design efficiency, short period, low cost and high accuracy.

The invention discloses an asphalt mixture tensile strength prediction method and system based on asphalt mortar cohesive strength and electronic equipment, and belongs to the technical field of material testing or analyse.The method comprises the steps that the splitting tensile strength of an asphalt mixture and the asphalt mortar cohesive strength are obtained; performing data fitting processing on the training set to obtain an asphalt mixture tensile strength training model, performing testing through the test set to generate an asphalt mixture tensile strength prediction model, inputting one or more asphalt mixtures into the asphalt mixture tensile strength prediction model, setting a prediction temperature range, and obtaining a model fitting effect. According to the embodiment of the invention, a large amount of test cost can be saved, the evaluation efficiency is improved, and the tensile strength value of the asphalt mixture can be efficiently and quickly obtained.

The invention discloses a regenerated asphalt mortar dynamic heating control method and device based on torque feedback, and the method comprises the steps: determining a predicted torque change curve in a future preset time period according to the current heating power, and determining the current heating power according to the predicted torque change curve; determining a first heating power adjustment strategy of the heating device in a future preset time period based on a preset first power generation strategy; performing first control on the heating device according to the first heating power adjustment strategy, and continuously obtaining real-time torque values of the recycled asphalt mortar at all moments in the first control process; and determining first torque change rates among the real-time torque values, and correcting the first heating power adjustment strategy by adopting a preset correction strategy according to the first torque change rates to obtain a second heating power adjustment strategy. The torque of the recycled asphalt mortar is monitored in real time and the heating strategy is dynamically adjusted, so that the heating process of the recycled asphalt mortar is accurately and efficiently controlled.

The invention provides a recycled asphalt mixture containing a finely separated and recycled asphalt pavement material and a mixing method of the recycled asphalt mixture. The recycled asphalt mixture comprises a recycled coarse material, wherein the particle size of the recycled coarse material is greater than 5mm; the recycled asphalt mortar comprises recycled fine materials, supplementary asphalt and a recycling agent, and the particle size of the recycled fine materials is larger than 0 and smaller than 5 mm; the supplementary aggregate comprises coarse aggregate and fine aggregate, the particle size of the coarse aggregate is greater than 4.75 mm, and the particle size of the fine aggregate is greater than 0.075 mm and less than 4.75 mm; the recycled coarse material and the recycled fine material are obtained by finely separating the recycled asphalt pavement material. The regenerated asphalt mixture disclosed by the invention is excellent in performance, and compared with a traditional regenerated asphalt mixture, the high-temperature dynamic stability, the low-temperature crack resistance, the damage bending-tensile strain, the water stability, the freeze-thaw splitting strength, the fatigue life and the like are greatly improved.

The invention provides a polyester fiber asphalt mortar in-situ tensile fracture test device which comprises a base, a pressure test wheel is arranged between a placement block and a fixing plate, two placement racks are symmetrically arranged on the inner side of a fixing rack, pressure test balls are correspondingly arranged at the upper ends of the placement racks, anti-skid racks are arranged on the inner sides of the placement racks, and the anti-skid racks are arranged on the inner sides of the placement racks. And two sides of the connecting piece are symmetrically provided with two elastic force dynamometers. A pressure test wheel is rotatably connected to the outer side of a rotating shaft, and a clamping groove is formed in the inner side of a placement block, so that the device facilitates rapid, simple and uniform pressure test tensile fracture, a connecting piece is fixedly connected to the upper end of a sliding pressing rod, two connecting plates are symmetrically and fixedly connected to the two sides of the connecting piece, and third electric push rods are fixedly connected to the lower ends of the connecting plates; the lower end of the third electric push rod is fixedly connected to the upper end of the fixing frame, and an elastic force dynamometer is correspondingly arranged on one side of the connecting plate, so that the device is convenient to quickly and accurately measure force and test pressure and is not easy to slide randomly in a tensile fracture test process.

The invention provides a split-phase cooperative asphalt mixture digital image multi-component segmentation method, and relates to the field of asphalt mixture image segmentation, and the method comprises the steps: obtaining a digital image of an asphalt mixture section, converting the digital image into a gray image, and carrying out the preprocessing of the gray image, and obtaining a to-be-segmented image; performing gap segmentation on the to-be-segmented image to obtain a gap phase image mask; segmenting the to-be-segmented image by using the RAN-UNet deep learning image segmentation model to obtain an aggregate image mask; performing three-dimensional voxel reconstruction to obtain a three-dimensional digital model, and performing connectivity analysis and edge detection to obtain a connected gap mask, an open gap mask and a closed gap mask; performing critical particle size screening and structural gap identification to obtain a structural gap mask and a mortar internal gap; and carrying out particle size screening on the aggregate image mask, extracting an asphalt mortar region, and slicing and converting the asphalt mortar region again to obtain a mortar phase image. According to the invention, the segmentation precision of the asphalt mixture digital image is improved.

The application discloses a high-viscosity recycled asphalt mortar based on oil-rich RAP fine materials and a preparation method thereof, and belongs to the technical field of highway engineering materials. The high-viscosity recycled asphalt mortar comprises the following components: oil-rich RAP fine materials, base asphalt, a high-viscosity modifier, a recycling agent and a dissolving agent. The high-viscosity modifier comprises the following components: waste tire rubber powder grafted with GMA (glycidyl methacrylate), BMI (bismaleimide), an adhesive, isooctanol polyoxyethylene ether and sulfur. The waste tire rubber powder grafted with GMA can improve the interfacial bonding strength of the oil-rich RAP fine materials and the base asphalt, thereby improving the water damage resistance of the recycled asphalt mixture. The BMI forms an interpenetrating structure (crosslinking network) among the rubber powder, the oil-rich RAP fine materials and the base asphalt, thereby improving the crack resistance of the recycled asphalt mixture.

The invention discloses an asphalt mixture dynamic modulus prediction method and system and a storage medium, and the method comprises the following steps: S1, obtaining a fractal dimension of a coarse aggregate through the grading screening fitting of an asphalt mixture, and building a probability density function of the particle size distribution of the coarse aggregate according to the fractal dimension; s2, calculating the dynamic complex modulus by using the energy storage modulus and the loss modulus of the asphalt mortar; s3, dispersing the coarse aggregate into a plurality of particle size intervals, calculating the volume fraction of each particle size interval according to a probability density function, and calculating the equivalent inclusion modulus of the coarse aggregate in combination with the dynamic complex modulus; and S4, taking the equivalent inclusion modulus as a new inclusion phase, taking the asphalt mortar as a basic item, and solving the dynamic modulus of the asphalt mixture through a self-consistent method. The equivalent inclusion modulus is used as a new inclusion phase, the asphalt mortar is used as a basic item, and the dynamic modulus of the asphalt mixture is solved through a self-consistent method. According to the method, a physical mechanism can be truly restored, and the dynamic modulus of the asphalt mixture can be accurately predicted.

The application discloses a kind of semi-covering layer semi-bedrock foundation gravity dam foundation seepage prevention water stop design method, belong to the field of hydraulic engineering design.This application method is aimed at the complex conditions of semi-covering layer semi-bedrock foundation, adopts zoning combination seepage prevention scheme: bedrock region sets seepage prevention curtain, covering layer region sets seepage prevention wall;Comprehensive construction period structure dead weight, running period structure dead weight, water pressure, uplift pressure and other loads, design seepage prevention wall top and dam foundation embedded joint and dam bottom local structure, reserve deformation and with two purple copper water stop to realize water stop by asphalt mortar joint filling;Finally, the rationality of scheme is verified by three-dimensional finite element seepage deformation numerical calculation.This application breaks through the limitation of traditional design, provides quantitative design method, and has strong operability, provides technical support and reference for similar projects.

The invention provides an asphalt pavement damage multi-scale model establishment method considering dynamic-static-water combined action and application. The multi-scale model establishment method comprises the following steps: determining dynamic-static-water combined action comprehensive damage factors through test analysis of water damage characteristics of asphalt mortar and asphalt mixtures; the method comprises the following steps of: establishing a mesomechanics model which comprises a water damage viscoelasticity constitutive model of the asphalt mortar, a still water damage evolution process model and a cohesion model for describing cohesion and cohesion damage; and establishing a macromechanical model, wherein the macromechanical model comprises a water damage viscoelastic constitutive model, a still water damage evolution process model and a dynamic water damage evolution process model of the asphalt mixture. Respectively establishing an asphalt pavement RVE model and a macroscopic model by adopting finite elements, writing a viscoelastic constitutive model into a UMAT subprogram, and carrying out macroscopic and microscopic water damage model numerical calculation under the combined action of dynamic water and static water; and connecting macro and micro numerical models through a homogenization method to realize water damage prediction from micro characteristics to macro performance.

The application provides a bituminous mortar crack resistance mechanism characterization method and device based on in-situ loading, and relates to the field of material analysis. The method comprises the following steps: obtaining a target sample containing a fiber reinforced phase and having a preset crack evolution region; applying an external load to the target sample, and obtaining an in-situ observation image sequence and mechanical response data; determining crack evolution characteristics, crack propagation characteristics, fiber action characteristics and dynamic evolution characteristics based on the in-situ observation image sequence; determining damage evolution characteristics based on the mechanical response data and completing stage division of the crack evolution process; taking the stage division result as an analysis framework, inputting the dynamic evolution characteristics, the crack propagation characteristics, the fiber action characteristics and the damage evolution characteristics into a cross-stage correlation analysis model to obtain crack evolution behavior characterization results; and determining the crack resistance mechanism of the target sample according to the crack evolution behavior characterization results. The application solves the problem that the fiber crack resistance mechanism is difficult to accurately characterize in the prior art.

The invention discloses a high-position hot melting RAP fine aggregate asphalt mortar preparing and adding device which comprises an asphalt storage tank, the asphalt storage tank internally comprises an asphalt electric heating system, a large-particle aggregate filtering device, an asphalt mortar discharging system and an asphalt flue gas discharging device, and an asphalt stirring system comprises two sets of symmetrical four-group frequency conversion spiral stirrers. The asphalt electric heating system is used for electrically heating an asphalt tank body and an asphalt mortar discharging port, the asphalt mortar discharging system comprises an air cylinder, a pneumatic valve group and the like to realize accurate metering and discharging of asphalt mortar, and the asphalt smoke discharging device is an environment-friendly discharging system for asphalt smoke and water vapor generated by heating. According to the high-position hot melting RAP fine aggregate asphalt mortar preparing and adding device, asphalt mortar double-layer laminar flow stirring and filtering are designed, effective dissolving and uniform dispersing of asphalt mortar are achieved, through reasonable setting of the working rotating speed and the working rotating direction of the four sets of frequency conversion spiral stirrers, the uniformity, the fluidity and the workability of asphalt mortar are guaranteed, and the high-position hot melting RAP fine aggregate asphalt mortar preparing and adding device is suitable for large-scale production. High-quality, high-efficiency and high-addition application of the RAP fine aggregate is improved, and better and wider application prospects are brought to RAP material application.

This invention discloses a coal liquefaction residue-based warm-mix self-healing dual-function asphalt modifier and its preparation method, belonging to the field of road engineering materials technology. The modifier consists of the following components by mass percentage: plasma-activated coal liquefaction residue micropowder (40-60%), warm-mix functional agent (10-20%), self-healing microcapsules (15-25%), interface reinforcing agent (5-10%), and coupling agent (2-5%). The plasma-activated coal liquefaction residue micropowder has a particle size of 0.15 mm, a specific surface area of ​​300-400 m² / g, and a surface hydroxyl content of 1.2-2.0 mmol / g. Its porous structure is used to adsorb and slowly release the warm-mix functional agent, and also serves as a carrier for the microcapsules. The warm-mix functional agent is a compound of sodium alkylbenzene sulfonate / polyoxyethylene ether and glyceryl stearate / methyl oleate, which are oriented at 120-130℃ to form a lubricating interface layer, reducing the viscosity of the asphalt mortar by more than 30%. The self-healing microcapsules use polyurethane as the shell material and contain asphalt recycler, sulfur, and plasticizer in the core material. They can rupture and release the core material when microcracks propagate.

The present invention discloses a method for numerically generating two-dimensional void ratio of porous asphalt mixture, comprising the following steps: generating a specified number of random polygonal coarse aggregates of various particle sizes according to the mixture gradation curve; placing polygonal coarse aggregates in a specified two-dimensional area according to the principle of no coverage and no overrun; performing image enhancement processing on the obtained placement results; specifying the distribution probability of growth nuclei and the growth probability in each direction within the void range based on a four-parameter random growth algorithm to generate asphalt mortar particles; identifying and dividing the skeleton, mortar and voids, and assigning microscopic parameters. The present invention is of great significance for numerical simulation of road engineering, and can better control the uniform distribution of voids, greatly improving practicality.

The invention provides high-toughness active cooling asphalt mortar and a preparation method thereof, and the asphalt mortar is prepared from the following raw materials in parts by weight: 70 to 85 parts of matrix asphalt, 37.5 to 45 parts of mineral powder, 0.2 to 0.5 part of ceramic fiber and 30 to 45 parts of montmorillonite-SAP composite material. The montmorillonite-SAP composite material is formed by polymerizing organically modified sodium montmorillonite and acrylic monomers under the action of an initiator and a cross-linking agent, and has good heat absorption cooling and water storage slow release performance; the ceramic fibers can be uniformly dispersed in the mucilage after being lubricated, so that the crack resistance and the structural toughness of the ceramic fibers are improved; the mineral powder as an inorganic filler enhances the stability of the mucilage. The asphalt mortar provided by the invention not only can effectively reduce the temperature of an asphalt pavement and effectively reduce ruts and other diseases caused by high temperature of the pavement in summer, but also can remarkably improve the self toughness, thereby improving the anti-fatigue performance of the asphalt pavement structure.

The present invention provides a method for simulating the surface crack expansion behavior of a steel bridge deck pavement layer under the action of dynamic water pressure based on discrete elements. The specific steps of the method are: first, a discrete element model of an asphalt pavement layer of corresponding size and gradation is generated according to the research objective; second, corresponding micromechanical parameters are assigned to the generated coarse aggregate particle clusters and asphalt mortar particles according to the macroscopic mechanical properties; next, based on Darcy's law, the Fish language is used in PFC2D to realize the coupling effect between the fluid and the asphalt pavement layer, and the number of dynamic water scouring, the number and development path of crack development, and the number of normal and tangential damages of particle bonding are collected in real time during the simulation process. When the number of dynamic water scouring actions reaches the target value, the simulation is terminated and the data results are exported to analyze the micromechanism of the surface crack expansion of the steel bridge deck pavement layer under the action of dynamic water pressure.

The invention provides a nanoindentation testing method for a composite asphalt mixture, and relates to the technical field of asphalt material performance research. The method comprises the following steps: S1, preparing a double-solid waste epoxy resin composite asphalt mixture test piece; s2, grinding and polishing the test piece by adopting a step rotating speed and composite lubricating liquid synergistic process so as to obtain the surface smoothness meeting the nanoindentation test requirement; s3, acquiring a macroscopic elastic modulus of the test piece, and automatically generating nanoindentation test parameters according to the macroscopic elastic modulus through a pre-established Sigmoid mapping model; and S4, carrying out nanoindentation test according to the test parameters so as to evaluate the micro-mechanical properties of the asphalt mortar, the aggregate and the interface transition area. By reasonably designing the mix proportion and the production process, efficient utilization of the waste asphalt pavement material and the steel slag is achieved, the resource utilization rate is increased, sustainable development is promoted, and a high-performance, economical and environment-friendly solution is provided for road maintenance and repair engineering under complex climate conditions.

The invention relates to an asphalt warm-mixing modifier based on phosphogypsum and a preparation method thereof. The asphalt warm-mixing modifier comprises 82-95 parts of calcium sulfate dihydrate, 0.5-12 parts of a silicate additive and 0.3-3 parts of a surfactant. The calcium sulfate dihydrate is derived from phosphogypsum; the calcium sulfate dihydrate is subjected to a dehydration reaction at a high temperature to generate water vapor, calcium sulfate hemihydrate and anhydrous calcium sulfate, and the volume expansion ratio of the generated water vapor is 1500-1700 times. The method has the beneficial effects that water vapor is generated by utilizing the dehydration reaction of calcium sulfate dihydrate, controllable foaming is realized, the viscosity of asphalt is reduced by 20-38%, the warm mixing temperature can be reduced by 15-25 DEG C, calcium sulfate hemihydrate generated in the dehydration process has gelling activity and acidification effect, the cohesive force and water resistance of asphalt mortar can be enhanced, and the viscosity of the asphalt mortar can be improved. And anhydrous calcium sulfate formed by further dehydration is used as an inorganic filler and has double effects of compact filling and acidification modification.

The invention relates to the technical field of road engineering, in particular to induction heating self-repairing asphalt concrete and a preparation and repairing method thereof. The induction heating self-repairing asphalt concrete is prepared from 75 to 83.5 parts of heat shielding functional coating coarse aggregate, 12 to 15 parts of fine aggregate and 4.5 to 10 parts of mineral powder, the heat shielding functional coating coarse aggregate comprises a heat shielding material, a polymer emulsion and a coarse aggregate. The heat shielding functional coating coarse aggregate further comprises 3-6 parts of asphalt and 1-4 parts of a high-conductivity material. According to the induction heating self-repairing asphalt concrete disclosed by the invention, the temperature of asphalt mortar can be quickly increased to 130-160 DEG C by utilizing an alternating electromagnetic field, and micro cracks are quickly repaired through flowing of asphalt; the used heat shielding function coating coarse aggregate can enhance the bonding effect of the aggregate, reduce abrasion and breakage of the aggregate in the forming process, regulate and control heat flow conduction and energy distribution, reduce heat loss and ensure that asphalt mortar is in a high-temperature flowing state for a long time, so that the induction heating self-repairing efficiency of the asphalt concrete is improved.

This application relates to a method and system for designing the mix proportion of cement emulsified asphalt mortar for high-speed railways. The method includes the following steps: inputting design factors of the cement emulsified asphalt mortar to be designed into a design model; the design factors include raw material types, quantities, and environmental parameters; predicting and outputting performance indicators corresponding to the cement emulsified asphalt mortar to be designed through the design model; the performance indicators include fluidity, spreadability, working time, compressive strength, elastic modulus, and fatigue life; adjusting the design factors of the cement emulsified asphalt mortar to be designed according to the performance indicators and inputting them into the design model to obtain the performance indicators corresponding to the adjusted design factors; repeating the input and adjustment steps multiple times until the optimal design factors that meet the performance requirements are obtained and output. The system and equipment are used to execute the above method. This application has the advantages of high design efficiency, short cycle, low cost, and high accuracy.

The invention discloses a recycled asphalt mortar fusion degree evaluation method which comprises the following steps: S1, acquiring a force value-displacement curve of an asphalt mortar calibration test piece with different old asphalt mixing proportions, and calculating interface failure energy of the corresponding calibration test piece according to the force value-displacement curve; s2, fitting a regression equation of the interface failure energy and the fusion degree; and S3, obtaining a force value-displacement curve of the to-be-evaluated regenerated asphalt test piece, calculating the interface failure energy, and calculating the fusion degree based on the fitted regression equation. According to the method, the fusion degree is determined through the pull-out test, quantitative evaluation can provide a reference basic database for technological parameters of recycled asphalt mortar preparation, interface damage can be easily obtained, the same raw material evaluation method can be repeatedly used, and the fusion effect of the whole fine material in the mortar can be evaluated instead of local evaluation.

The invention belongs to the technical field of road engineering, and particularly relates to an asphalt mixture fatigue damage evolution-based pavement life estimation method, which comprises the following steps of S1, establishing an asphalt mixture three-dimensional mesoscopic numerical model capable of representing aggregate, asphalt mortar and gap three-phase spatial distribution; s2, endowing the bituminous mortar phase in the three-dimensional mesoscopic numerical model with a constitutive model considering fatigue damage evolution; s3, setting a critical damage threshold value Dcr; s4, establishing macroscopic-microscopic scale associated mechanical response transmission, and obtaining a microscopic damage increment delta D; and S5, based on the delta D, accumulated damage D (n) is calculated, and when D (n) reaches Dcr, the corresponding loading frequency N is the fatigue life of the pavement. The method provided by the invention can be used for different gradation, asphalt types, pavement structures and load conditions, and can provide a theoretical basis for the design of the high-performance anti-fatigue asphalt mixture by analyzing the influence of the microstructure on the fatigue life.

The present invention provides a method for quantitatively evaluating a blending degree of new- and old-asphalt based on recycled asphalt mortar. A linear viscoelastic area of the recycled asphalt mortar is tested and determined based on strain scanning; a rheological index of the recycled asphalt mortar is obtained based on frequency scanning; a difference between a rheological index of recycled asphalt mortar with complete blending of new asphalt and old asphalt and a rheological index of actually blended recycled asphalt mortar is compared; and a complex modulus deviation rate and the blending degree of new- and old-asphalt that are at a key frequency are calculated based on formulasMDI=1N⁢∑i-1N<semantics definitionURL="">❘<annotation encoding="Mathematica">"\[LeftBracketingBar]"< / annotation>< / semantics>Gactual⁢ blending⁡(fi)*-Gcomplete⁢ blending⁡(fi)*Gcomplete⁢ blending⁡(fi)*<semantics definitionURL="">❘<annotation encoding="Mathematica">"\[RightBracketingBar]"< / annotation>< / semantics>and DOB=1−MDI, where MDI represents the complex modulus deviation rate; DOB represents the blending degree of new- and old-asphalt; N represents a number of parallel testsGactual⁢ blending⁡(fi)*represents a complex modulus of the recycled asphalt mortar with actual blending of the new asphalt and the old asphalt; andGcomplete⁢ blending⁡(fi)*represents a complex modulus of the recycled asphalt mortar with complete blending of the new asphalt and the old asphalt. The present invention first evaluates the blending degree of new- and old-asphalt from the asphalt mortar, which breaks through the limitation of a traditional technical means in authenticity, accuracy practicability.

The invention discloses red mud-phosphogypsum synergistically modified asphalt mortar and a preparation method thereof. The method comprises the following steps: modifying red mud and phosphogypsum, and adding an SBS modifier, a compatilizer, a stabilizer, an exciting agent, slaked lime and wood fibers to design asphalt mortar and an asphalt mixture with excellent high and low temperature performance. According to the method, the low-temperature flexibility of the asphalt mortar is improved and the brittleness of the asphalt mortar at low temperature is reduced by utilizing the synergistic effect of the red mud, the ardealite and the exciting agent hydroxyapatite or carbonated apatite; the red mud and the ardealite can excite the reaction activity among different metal ions under the action of the exciting agent hydroxyapatite or apatite carbonate, so that the red mud and the ardealite are promoted to form a more complex spatial network structure with the asphalt and form a complex spatial network structure with the asphalt, the cohesion and the deformation resistance of the asphalt mortar are enhanced, and the service life of the asphalt mortar is prolonged. The high-temperature stability of the asphalt mortar is effectively improved, and the rut damage of a pavement under a high-temperature condition is reduced; active ingredients of the red mud and the ardealite chemically react with certain components in the asphalt, so that the water stability of the asphalt mortar is further improved, and the diseases such as pits and slots caused by water damage to the pavement are reduced.

The present invention relates to the field of pavement materials, and specifically discloses an alkali-magnesium cement-based emulsified asphalt mortar for semi-flexible pavements, its preparation method and application. The alkali-magnesium cement-based emulsified asphalt mortar for semi-flexible pavements is made from raw materials including an alkali-magnesium cement base material, cationic emulsified asphalt, hydroxyethylidene diphosphonate, filler and water. The raw materials of the alkali-magnesium cement base material include the following components in parts by weight: 289.3-309.4 parts of magnesium oxide, and 140.6-160.7 parts of magnesium sulfate. The weight part ratio of the dosage of hydroxyethylidene diphosphonate to the dosage of magnesium oxide is (1.45-1.55: 289.3-309.4). The toughness of the alkali-magnesium cement-based emulsified asphalt semi-flexible pavement material of the present invention is further improved, and it is not easy to crack, further improving the service life and safety performance of the road.

This application relates to a method for evaluating the uniformity of asphalt mixtures based on uniform distribution, comprising: S1: collecting asphalt mixture samples to be tested; S2: scanning and sampling the asphalt mixture prepared in step S1 using CT scanning technology; S3: acquiring CT slice images obtained in step S2; S4: processing the CT scan cross-sectional images of the samples in step S3 to obtain binary images of the distribution of coarse aggregate and asphalt mortar on the cross-section; S5: calculating the area and particle coordinates of each coarse aggregate in the two-dimensional cross-section based on the binary image of coarse aggregate obtained in step S4; S6: evaluating the asphalt mixture samples to be tested using the uniformity evaluation index of the two-dimensional / three-dimensional cross-section of the asphalt mixture specimen. The method of this application comprehensively considers the location, area, and quantity information of the aggregates, overcoming the shortcomings of existing methods that fragment the integrity of coarse aggregates; this application evaluates the uniformity of the entire specimen from a three-dimensional perspective, reducing the accumulation of errors.