87 results about "Asphalt mortar" patented technology

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 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 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 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 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 invention belongs to the technical field of road engineering maintenance, and particularly relates to a treatment method for heavy traffic road pavement reflection cracks. According to the method, accurate targeted repair is achieved in the mode that the discrete milling areas are arranged along the crack at intervals, whole-line milling is avoided, and the construction cost is effectively saved. A grouting pipe penetrating into a base layer is used for grouting, a middle-layer macroporous asphalt mixture stress absorption layer and a surface-layer asphalt mortar functional layer are combined, and a crack source for anchoring a crack from the bottom and adopting a high-strength slurry anchor cable is constructed; stress is eliminated in the middle, the stress of the pavement is absorbed by adopting a flexible material, and capillary water is prevented from rising; moisture is isolated at the top, and high-viscosity asphalt is adopted for complete sealing to prevent moisture from invading; therefore, the propagation path of the reflection crack is fundamentally blocked.

The application discloses a rubber powder asphalt pavement performance early warning method based on a rubber powder swelling-dissolution state, rubber powder modified asphalt preparation and asphalt mortar material attribute parameter acquisition, rubber powder asphalt performance index and rubber powder particle swelling-dissolution state change parameter acquisition based on macro-micro test, numerical processing of the obtained parameters, quantitative characterization of the swelling-dissolution state of the rubber powder particles, construction of a prediction model of the performance of the rubber powder modified asphalt and the swelling-dissolution state by using a neural network algorithm, modeling and microscopic parameter assignment of the heterogeneous rubber powder modified asphalt mortar in the discrete element software, obtaining the internal swelling-dissolution state of the surface layer rubber powder asphalt by using the neural network prediction model, realizing fine modeling in the discrete element and deducing the permanent deformation behavior of the pavement structure under repeated loads, and realizing the early warning of the performance of the rubber powder modified asphalt pavement structure.

The invention provides a canal lining joint structure based on multi-parameter optimization, and relates to the field of canal protection. The canal lining joint structure based on multi-parameter optimization is arranged between adjacent concrete precast slabs, and comprises a joint width, a joint width, a joint width, a joint width, a joint width, a joint width, a joint width, a joint width, a joint width and a joint width, the joint width ranges from 1.8 cm to 2.2 cm; the joint material is used for filling the joint and is made of emulsified asphalt mortar or cement mortar with the compressive strength not lower than 20 MPa; the contact interface of the concrete precast slab and the joint material is a rough interface, and the average roughness of the rough interface is 1.8-2.2 mm. Through optimization design, the ultimate bearing capacity and the shear strength of the joint structure are greatly improved, the falling risk of the lining plate under the action of uplift pressure is effectively restrained, the service life of a channel is prolonged, three key parameters including the joint width, the interface roughness and the joint material are systematically coupled and optimized for the first time, and the joint structure is optimized. The optimal matching relation among the three is found, and the limitation of single-factor research is overcome.

The application discloses a recycled asphalt mortar mixing uniformity analysis method and system based on thermal imaging, relates to the technical field of computer vision and industrial automation, and introduces multi-scale temperature feature analysis and time sequence dynamic modeling, so that the detection capability for microscopic unevenness is remarkably improved; non-contact thermal imaging collection is adopted, image processing and machine learning algorithms are combined, precise identification and quantitative evaluation of temperature field abnormalities in the mixing process are realized; the application effectively enhances the response sensitivity to the edges of small RAP agglomerates by extracting multi-scale temperature gradient features; the correlation model of pixel-level temperature response and material thermal conductivity characteristics is established by introducing time sequence temperature residual features, which can distinguish the abnormality caused by real agglomeration from ordinary thermal noise, and the reliability of the detection result is greatly improved; and through unsupervised clustering and adaptive threshold segmentation technology, the change of different mixing conditions and material proportions can be adapted, and the misjudgment risk of the fixed threshold is avoided.

The invention discloses a rigid-flexible composite pavement material based on modified emulsified asphalt mortar as well as a mix proportion design and a preparation method of the rigid-flexible composite pavement material. According to the method, the pavement performance of the material is directly used as an index, the mix proportion design and the gradation design of the modified emulsified asphalt mortar are sequentially carried out, then a relation curve of the stability of the target rigid-flexible composite pavement material mixture and the addition amount of the modified emulsified asphalt is constructed through a Marshall test, and the optimal use amount of the target rigid-flexible composite pavement material mixture is determined. It is further ensured that the obtained material meets the performance requirement of a target material through a pavement performance test; according to the rigid-flexible composite pavement material designed based on the method, by optimizing the mixing ratio of all the raw materials, the adhesion state and the forming process of cement, emulsified asphalt and a material collecting piece are effectively improved, and therefore the high-temperature performance and the low-temperature performance of the material are improved at the same time; heating is not needed in the whole preparation process of the material, grouting is not needed in the actual laying process, and the technical problems that the early strength of the pavement is low and the passage is slow due to the fluidity of the grouting material are fundamentally solved.

This invention relates to the field of pavement materials technology, specifically to a coal-based recycled solid waste aggregate asphalt mixture and its application. The mixture comprises coal-based recycled solid waste aggregate, calcium carbonate mineral powder, lignin fiber, No. 70 road petroleum asphalt, and a viscoelastic network asphalt mortar. The fine coal gangue is thermally activated and then grafted with silane coupling agent KH-550 and titanate coupling agent AC-201 to form a surface-modified micropowder. This micropowder is then combined with asphalt and KH-560 to construct a viscoelastic network mortar, which is pre-coated onto 4.75-9.5mm aggregate to form a skeleton material. Finally, it is formed through a graded mixing process, significantly improving its anti-segregation and anti-scattering properties while maintaining high porosity and water permeability, making it suitable for permeable pavement construction.

The present application belongs to the technical field of road material, and particularly relates to a preparation method and evaluation method of a test piece for testing the blocking performance of heavy metal elements in waste fly ash, wherein the preparation method comprises the following steps: mixing different amounts of waste fly ash material with asphalt material respectively, obtaining waste fly ash-asphalt mortar with different doping amounts through 7 steps, and finally obtaining the final test piece. The present application has the following advantages: 1. The present application prepares asphalt mortar pieces with different doping amounts, and then assembles and combines them, so as to analyze the sedimentation trend of waste fly ash in the test piece, and further analyze the blocking effect of the asphalt material. 2. The evaluation test of the present application can avoid the randomness of data, and accurately obtain the heavy metal element penetration under different layer quality tests and different working conditions, so as to objectively evaluate the blocking effect of the asphalt material on the waste fly ash.

The invention discloses a semi-rigid base asphalt pavement fatigue crack concentrated outbreak period early warning method, which comprises the following steps: based on the structure type and the service life of a target pavement, determining the macroscopic development stage of a transverse crack, identifying a road section in a gentle development stage with a relatively slowed crack propagation rate, and performing early warning on the road section in the gentle development stage; taking as a potential risk paragraph; carrying out crack density detection on a smooth development stage road section, calculating the total length of cracks in a unit area as a crack surface density index, and comparing the index with a preset first-level threshold value to preliminarily evaluate the macroscopic crack development degree; the method comprises the following steps: drilling an asphalt surface layer core sample at a representative crack position of a road section, extracting an upper surface layer asphalt mortar material, testing a complex shear modulus and a phase angle through a rheological test, and calculating a microcrack early warning index reflecting the fatigue performance of the material based on the complex shear modulus and the phase angle; dividing the microcrack early-warning indexes into different early-warning grades according to the numerical range of the microcrack early-warning indexes; according to a comparison result of a crack surface density index and a preset threshold value, a differentiated pavement detection frequency, a coring period or a maintenance engineering strategy is formulated according to different early warning levels and crack density combinations; the method does not need complex model fitting, and is suitable for normalized management and maintenance practice of a large-scale road network.

The present application relates to a kind of normal temperature pitch mastic with desulfurization gypsum as filler, it contains filler, curing agent and normal temperature pitch;Filler is the mixture of desulfurization gypsum and limestone powder;Desulfurization gypsum is pretreated by high temperature oxidation;The mass ratio of filler and normal temperature pitch is 0.8-1.1:1;Curing agent is the mixture of Portland cement and metakaolin, its dosage is 15-25% of normal temperature pitch;Normal temperature pitch is reactive normal temperature liquid pitch, is to flow to the matrix pitch of adding reactive liquid agent and modifier water-based epoxy resin emulsion and is prepared by shearing mixing;Reactive liquid agent is to use unsaturated fatty acid as liquid agent matrix material, add zwitterionic surfactant and phenol polymer and is prepared by stirring mixing.The present application can reduce the dependence on limestone on the one hand, on the other hand, the desulfurization gypsum of large amount of solid waste of thermal power plant can be reduced and recycled, and test proves that the pitch mastic has good road performance.

The application discloses a kind of skeleton dense type plant mixing hot regeneration asphalt mixture mix design method, it is related to road engineering technical field, including: selecting raw material;Raw material includes new additional aggregate and RAP, the performance detection is carried out to new additional aggregate, and extraction screening test is carried out to RAP;Mixture uses SAC skeleton dense type gradation, when mix design, raw material is divided into skeleton aggregate and filler, and the volume ratio of skeleton aggregate and filler is 70:30, then according to SAC skeleton aggregate gradation key screen hole passing rate calculation method and new additional aggregate screening result, RAP screening result carries out 4.75mm above coarse aggregate blending ratio calculation, when calculation, the blending ratio of RAP in raw material is consistent with the grading ratio of coarse and fine aggregate in RAP;Plant mixing hot regeneration asphalt mixture is subjected to Marshall test, and the adjustment of filler is carried out according to the size of measured porosity.The application can realize the uniform distribution of asphalt mortar in RAP, and improve the high-temperature rutting resistance of mixture.

The application provides a design and performance evaluation method of fatigue-resistant high-modulus asphalt mixture, relates to the technical field of road engineering, and reduces parameter dependency by constructing a simplified dynamic modulus prediction model by using a historical database through multivariate nonlinear regression analysis, and simplifies the calculation of the equivalent modulus of asphalt mortar on asphalt shear modulus and filler volume fraction, so as to improve the generalization of the model with low cost and high practicability as the goal; the disconnection between gradation design and dynamic modulus optimization is solved by using an intelligent optimization algorithm, an optimization function is constructed in combination with a dynamic modulus target and a gradation constraint, and the optimization is carried out through a cross genetic and particle swarm algorithm, so that the designed optimal mixture can meet the performance indicators; the relative error closed-loop check between actual measurement and the target dynamic modulus is used to enhance the design criterion, and the problem that the prediction deviation leads to multiple design adjustments is solved; and the problems of long cycle and high cost in the traditional method are solved.

The invention discloses a preparation method of recycled asphalt mortar based on RAP fine aggregate. Comprising the following steps: S1, screening out RAP fine aggregate with the particle size of less than or equal to 2.36 mm; s2, selecting a proper asphalt mixture grading type, and calculating the percentage of each grade of fine aggregate; s3, selecting a proper asphalt-aggregate ratio, calculating the required asphalt content, and calculating the required mass of each grade of fine aggregate according to the volume of the corresponding forming test piece; s4, the inner diameter of an outlet of an extrusion device is selected according to the RAP fine aggregate grading characteristics and the asphalt aging state; and S5, adding the new fine aggregate, the regenerant and the asphalt, uniformly mixing, transferring the mixture into an extrusion device, placing the extrusion device under a press machine, and repeatedly extruding for multiple times to obtain the regenerated asphalt mortar. The problems of caking, regenerant failure and excessive aging of asphalt in the existing mixing process are solved, uniform mixing of the RAP fine aggregate and the regenerant is realized, and the regeneration performance of the RAP fine aggregate is improved.

The invention discloses an image-based asphalt pavement internal crack path phase identification and quantification method. The method comprises the following steps of obtaining a CT image sequence and performing image preprocessing; based on the preprocessed image sequence, a crack region is extracted and three-dimensional reconstruction is carried out to obtain a three-dimensional crack model and a crack skeleton path; identifying and reconstructing a coarse aggregate phase and an asphalt mortar phase from the core sample mixture, and forming a three-phase structure model containing the coarse aggregate phase, the asphalt mortar phase and a crack body by combining the crack region; dividing the crack skeleton path into a plurality of path sections; defining a sampling area for each path section; determining the type of a main material in each sampling area, and judging a crack propagation mode to which the path section belongs; counting expansion modes of all the path sections, and obtaining proportion distribution of each mode in the whole crack path; calculating a quantitative index used for representing a fracture dominant expansion mechanism; according to the method, material response characteristic quantification of typical crack types on a space path is realized, a judgment basis of different types of cracks of the semi-rigid base asphalt pavement is supported, and a decision reference is provided for maintenance strategy formulation and material optimization.

The application discloses a highway single-side widening old central separation belt position pavement structure and relates to the technical field of road engineering. The pavement structure is flush with the highway road surface. The pavement structure comprises, in sequence from the old roadbed upwards, a water-tight asphalt mortar layer, a drainage and anti-cracking large-void asphalt mixture layer, a reinforced concrete layer, a high-toughness polyester fiber bundle grid, a micro-permeable asphalt mixture lower layer, a high-modulus asphalt mixture middle layer and a high-anti-skid asphalt mixture surface layer. The top surface of the reinforced concrete layer is provided with a longitudinal drainage gravel blind ditch. A vertical PVC drainage pipe penetrating the reinforced concrete layer is arranged in the blind ditch. The bottom surface of the drainage and anti-cracking large-void asphalt mixture layer is provided with a horizontal drainage pipe. The vertical PVC drainage pipe penetrates the drainage and anti-cracking large-void asphalt mixture layer downwards and is connected with the horizontal drainage pipe. The application can effectively improve the anti-rutting performance and the drainage performance of the old central separation belt position pavement structure after the old central separation belt position is paved as a highway heavy-load lane.