336 results about "Asphalt mortar" patented technology

The invention discloses a super-high early-strength grouting material for repairing a ballastless track structure of a high speed railway, which is prepared by the following steps of: sequentially adding water, polymer emulsion, a water reducing agent, a rheology accessory agent and an antifoaming agent; adding admixture, cement, an expansion agent, a coagulator and a retarder, and stirring and blending the materials at a high speed. The parts by weight of the ingredients are as follows: 100 parts of superfine cement, 50-150 parts of admixture, 25-50 parts of redispersible emulsion powder, 3-10 parts of polymer emulsion, 5-25 parts of expansion agent, 0.1-1.0 part of carboxylic acid water reducing agent, 0.1-10 parts of coagulator, 0.1-5 parts of retarder, 0.001-0.005 parts of rheology accessory agent, 0.001 part of polyether-siloxane copolymer antifoaming agent and 20-70 parts of water. The material disclosed by the invention has the advantages of low viscosity, super-high early-strength, low cost, fatigue resistance, aging resistance and water erosion resistance, and the like, so that the material can be used for repairing the concrete gaps of ballastless tracks of high speed railways, gaps of cement asphalt mortar filling layers, cracks and damages.

The invention relates to a polyurethane resin mortar composition for cement base material repairing, which comprises raw materials A, B and C, wherein the raw material A comprises the following materials in parts by weight: 100 parts of polyalcohol, 5-60 parts of plasticizer, 0.01-3 parts of catalyst, 0-2 parts of defoaming agent, 0-30 parts of chain extender or crosslinking agent, 0-3 parts of coupling agent and 0-10 parts of stabilizer; the raw material B is isocyanate or prepolymer thereof; the raw material C is solid filler; and the mass ratio of the three raw materials A, B and C is 10:(1-30):(10-200). The composition is used as the repairing material for concrete structures of ballastless tracks and cement asphalt mortar, and has the advantages of high curing speed, good low-temperature curing property, high ductility and the like.

The invention relates to a semi-flexible pavement base material and a preparation method thereof. The semi-flexible pavement base material comprises 20-75% of an aggregate, 22-75% of cement-emulsified bitumen mortar and 1-8% of water. Through adjustment and optimization of composition and compatibility of the cement, emulsified bitumen and aggregate, an adhesion state and a molded structure of the cement, emulsified bitumen and aggregate are improved so that the semi-flexible pavement base layer structure has ideal rigidity and flexibility, rutting resistance and cracking resistance of the semi-flexible pavement base layer structure are improved and water damage resistance and fatigue resistance of the semi-flexible pavement base layer structure are improved. The semi-flexible pavement base material and the preparation method thereof are mainly used for building and refurbishment of high-grade roads and urban roads and are especially suitable for easily-rutted road sections such as heavy-loaded traffic roads, road intersections, uphill and downhill of a road, a bus stop and a bus transit lane.

The invention relates to an emulsified SBS polymer modified asphalt and preparation method thereof. At present, emulsification and emulsified modified asphalt applied to surfacing is hard to produce and not stable in quality, high temperature performance improvement is not obvious. The raw materials of the invention are matrix asphalt, water, SBS asphalt modifier, compound asphalt emulsifier, emulsification stabilizer and hydrochloric acid; firstly the matrix asphalt is heated, added with SBS asphalt modifier and then stirred to be swelled, high speed grinding by colloid grinder and full dispersion are carried out, and heat preservation growth is carried out to obtain SBS modified asphalt; compound asphalt emulsifier is added into water, emulsification stabilizer smoothened by water in advance is added, and appropriate hydrochloric acid is added to adjust pH value, so as to obtain liquid soap; and finally the SBS modified asphalt is subject to temperature reduction and then mixed with the liquid soap and emulsification dispersion is carried out, thus obtaining emulsified SBS polymer modified asphalt. The invention is applicable to coat tacking, coat sealing, surface treatment, slurry sealing and asphalt pavement recycling, asphalt wet-mixing of road construction and cerement asphalt mortar layer of passenger special line plate type unballasted track.

The invention relates to a rubber powder-asphalt emulsion for cement asphalt mortar and a preparation method thereof. The rubber powder-asphalt emulsion is prepared from the following components in parts by mass: emulsifier: 0.1-3%, asphalt: 20-60%, rubber powder: 5-40%, stabilizer: 0.1-0.5%, thickener: 0.1-0.3%, auxiliary agent for adjusting pH value: 0-0.2%, and the balance is water. The preparation method includes first modifying asphalt with rubber powder, and then emulsifying; first emulsifying asphalt, then emulsifying rubber powder; first emulsifying rubber powder, and then emulsifying asphalt. The invention makes full use of solid waste—rubber powder, has the characteristics of environmental protection and energy saving, not only significantly improves the stability of CA mortar, but also reduces the cost of preparing CA mortar.

The invention discloses polymer cement mortar for a slab ballastless track of a high-speed railway. The polymer cement mortar a comprises a dry raw material and a liquid raw material, wherein the dry raw material comprises a binding material component, an elastic adjusting component, an expanding component, an internal curing component, an aggregate component and a coagulation adjusting component; the liquid raw material comprises a polymer emulsion, a water reducing agent, a defoaming agent, an air entraining agent and water; and the weight ratio of the dry raw material to the liquid raw material is 100:(15-25), and the dry raw material and the liquid raw material are uniformly mixed in a proportion to prepare the polymer cement mortar. The polymer cement mortar has the advantages of controllable coagulation time, high adhering strength, adjustable elastic modulus, good elasticity and toughness, high durability and the like, and is capable of replacing cement emulsified asphalt mortar to be applied to a packing material of the slab ballastless track or can be used as a quick repairing material of a filling layer of cement emulsified asphalt mortar.

The invention belongs to the modified emulsified asphalt field, and more specifically relates to a SBS polymer modified emulsified asphalt and a preparation method, the SBS polymer modified emulsified asphalt is prepared by the following raw materials by mass percentages: 40-65% of SBS polymer modified emulsified asphalt, 25-50% of water, 2-10% of cation asphalt emulsifier, 0.1-2.0% of composite emulsified stabilizing agent and 0.2-2.0% of acid, wherein SBS polymer modified asphalt is prepared by mixing and reacting a SBS polymer modifier and matrix asphalt, and the mass of the SBS polymer modifier accounts for 3.5%-5.5% of that of the SBS polymer modified asphalt. The prepared SBS polymer modified emulsified asphalt has stable property, and can be used as a cement asphalt mortar layer and the like for a road tack coat, a seal layer, surface treatment, a slurry seal layer and a high speed railway plate-type ballastless track.

A cement-emulsified asphalt mortar used for railway and overhead railway in urban area contains cement and its additive, emulsified asphalt, sand, water, water-reducing agent, aluminium powder, surfactant, defoaming agent, polyacrylic fibres and chlorobutadiene latex. Its preparing process is also disclosed. Its advantages are high flowability, high strength and freeze-thawing resistance, and no environmental pollution.

The invention provides an emulsified asphalt, which has the compositions of bitumen, surfactant, additives and water, the content of each component as follows : Asphalt 22 -55% surfactant: cationic surfactant 1.0 - 15 %, non-ionic surfactant 1.0 -20%; auxiliaries 0.1-8%; cushion for water; the ratios are according to the percentage of weight.. The invention of products, in lines with its performance as 'People's Republic of China Ministry of Railways' plate ballastless track emulsified asphalt cement mortar CA technical conditions, ' In the practical use ,which is to avoid CA mortar (that is, cement -- Asphalt mortar) have Segregation and enable CA mortar have a appropriate time to fully meet the needs of the construction, so that the products of this invention can be effectively used for high-speed railway plate ballastless track in the CA mortar.

The invention discloses an asphalt mixture virtual performance test prediction method based on mesoscale simulation. The method comprises the steps of designing an initial mix proportion of an asphalt mixture, acquiring basic parameters of a material, carrying out a DSR test of asphalt mortar, carrying out a virtual creep test on the asphalt mortar, converting parameters in a virtual system, choosing multiple indoor tests needing to be predicted, constructing various three-dimension virtual test pieces, choosing a mechanic constitutive model of the material, choosing a loading condition of the virtual test, constructing a real-time monitoring system for test results, outputting final result prediction values of all the tests, comparing all indexes with standards to judge whether requirements are met, outputting suggesting to reselect a mix proportion if the requirements are not met, and outputting an optimal mix proportion if the requirements are met. According to the method, additional curves of the test results are monitored in real time, the obtained output results are compared to judge whether multiple performance indexes of the mixture to be predicted meet the standard requirements, unnecessary relative-property indoor tests are reduced, and test basis is provided for optimal design of the mix proportion of the asphalt mixture.

Cement, mixing agent, pitch emulsion, sand (1.90-2.10 portion), water, foaming agent, aluminium powder, AE agent and plasthetics emulsion are mixed by equitable selecting material and matching, compound pitch emulsion agent is added in to make sand aggregate not being separated and has elasticity and excellent vibration strength since that small quantity of nonion polymer is mixed in compound pitch emulsion agent.

The invention provides anionic emulsified asphalt and a preparation method thereof. The cement emulsified asphalt comprises the following components in percentage by weight: 55 to 65 percent of asphalt, 0.5 to 5 percent of anionic surfactant, 0.02 to 4 percent of aid, and the balance of water. The anionic surfactant can be one of tall oil sulfonate, alkyl sulfonate, alkylbenzene sulfonate, alkyl sulfate and lignosulfonate. The emulsified asphalt provided by the invention has the advantages of good storage stability, wide temperature adapting range, good adaptability with cement, good compatibility and the like; and the cement emulsified asphalt mortar prepared by using the emulsified asphalt has good flow property, long service life and wide temperature adapting range, does not produce dissociation or lamination, has excellent physical and mechanical properties, and fully meets the requirement of construction, so that the emulsified asphalt can be effectively used for the cement emulsified asphalt mortar in plate type ballastless tracks of high speed railways.

The invention relates to a CA mortar material with high shock absorption performance for intercity high-speed railways and city subways, in particular to a CA mortar material with low elastic modulus, which is prepared by mixing and stirring the following raw materials in portions by weight: 1 portion of cement, 0.4-2.5 portions of emulsified asphalt, 0.01-3.5 portions of sands, 0.01-0.4 portion of expanding agent, 0-0.01 portion of defoaming agent, 0.00003-0.003 portion of air entraining agent, 0.001-0.1 portion of water reducing agent, 0-0.8 portion of water, 0.00001-0.001 portion of aluminum powder and 0.01-0.4 portion of rubber particle, wherein the rubber particle is rubber treated by an interfacial treatment agent, and the particle diameter is 0.5-3 millimeters. The CA mortar material with low elastic modulus, which is provided by the invention, can reduce the elastic modulus of the CA mortar and improve shock absorption and shock insulation effects.

The invention discloses a waterborne polyurethane emulsified asphalt concrete which is prepared from the following raw materials: mineral aggregates, emulsified asphalt and waterborne polyurethane emulsion, wherein the weight ratio of the mineral aggregates, the emulsified asphalt and the waterborne polyurethane emulsion is 100:(1-20):(7-20). The invention also discloses a preparation method of the waterborne polyurethane emulsified asphalt concrete, and the preparation method comprises the following steps: mixing the waterborne polyurethane emulsion with the emulsified asphalt, and uniformly stirring, so that waterborne polyurethane modified emulsified asphalt is obtained; adding the waterborne polyurethane modified emulsified asphalt into the mineral aggregates, uniformly stirring, and carrying out maintenance on the obtained product; or uniformly stirring the mineral aggregates, the emulsified asphalt, and the waterborne polyurethane emulsion, and carrying out maintenance on the obtained product. The prepared waterborne polyurethane emulsified asphalt concrete not only has the advantages of cold-mixed asphaltic concrete, but also has excellent mechanical properties and stability; the waterborne polyurethane emulsified asphalt concrete is excellent in pavement performance, and can be used for greatly prolonging the service life of pavements; and the maintenance time is short, and the traffic can be implemented in 1-3 days, therefore, the waterborne polyurethane emulsified asphalt concrete can be applied to the preparation of asphalt concrete paving materials, asphalt pavement repair materials, slurry seals for maintenance and asphalt mortar for micro-surfacing and high-speed railways.

The invention provides a track slab fine adjustment method for China railway track system (CTRS) I-type ballastless track laying. A CTRS I-type ballastless track comprises a base (5), cement emulsion asphalt mortar (4), a track slab (3) and a steel rail which are stacked with one another from top to down, and fasteners (2) which are fixed in bolt holes in the track slab and used for fastening the steel rail and convex flanges (6) positioned between longitudinal ends of the track slab. The method comprises the following steps of: establishing a control point (CP) III point control network according to a provided CP I and a provided CP II; arranging a track slab reference point (GRP) positioned in the center of each convex flange (6) according to the CP III; placing a measurement standard frame with a prism on the track slab to be measured; arranging a universal theodolite measurement station at the GRP of the track slab; and measuring the prism through a universal theodolite and finely adjusting the track slab according to the measured data. The invention also relates to a CTRS I-type ballastless track laying method.

The invention relates to a method for evaluating the damage self-healing capacity of asphalt mortar. The method includes stretching an asphalt mortar test piece in two directions at constant temperature under the condition that the strain rate is equal; monitoring stress and displacement data in a stretching and self-healing process in real time; and analyzing the data via a computer to obtain a self-healing coefficient of the asphalt mortar test piece. The method has the advantages that the self-healing capacity of the asphalt mortar can be quantitatively evaluated, influence of different factors such as self-healing time, self-healing temperature, self-healing pressure and asphalt damage degree before self-healing on self-healing effects of asphalt materials can also be tested, the method can be applied to asphalt mortar materials with different proportions, is simple and feasible, operation is easy, and a guiding foundation for optimally selecting and optimally designing materials of sustainable asphalt pavements is laid.

The invention relates to rubber powder modified cement bitumen mortar which is formed by mixing the components with the weight ratio as follows: 100 parts of cement, 50 to 170 parts of emulsified asphalt, 5 to 80 parts of rubber powder, 160 to 230 parts of sand, 20 to 85 parts of water, 0.01 to 0.1 parts of aluminium powder, 0.1 to 0.5 parts of anti-foam additive and 0.05 to 0.2 parts of thickener. The invention adopts the rubber powder to partially substitute the emulsified asphalt to prepare CA mortar, thereby obviously improving the weathering resistance of the CA mortar and reducing the cost of the CA mortar; the CA mortar has better weathering resistance when the rubber powder has higher mix proportion. Within the dosage range of the invention, the rubber powder has no disadvantage to the performances of the CA mortar, such as workability, strength, modulus of elasticity, degree of separation, expansion rate, bleeding rate, frost resistance, etc.

The invention discloses emulsified asphalt and a preparation method thereof. The emulsified asphalt comprises the following components in percent by weight: 60 to 65 percent of asphalt, 1.0 to 4.0 percent of complex emulsifier, 0.04 to 0.4 percent of stabilizing agent, 0.05 to 0.2 percent of thixotropic agent, 0.1 to 4 percent of aid and the balance of water. The emulsified asphalt for CRTS II type slab ballastless track cement-emulsified-asphalt mortar solves the main problems of poor stability, short available time, poor temperature adaptability, easy delamination and the like of the emulsified asphalt in the prior art. By adopting technology of complexing the emulsifier, various stabilizing agents are added, so the emulsified asphalt has the advantages of good emulsifying effect, good storage stability, good temperature adaptability of prepared cement-emulsified-asphalt mortar, long available time and no delamination, and can completely meet the requirement of cement-emulsified-asphalt mortar for ballastless track cushion of high speed railways.

The invention relates to emulsified asphalt for longitudinal connecting plate type ballastless track cement emulsified asphalt mortar. The emulsified asphalt comprises the following components in percentage by weight: 60 to 65 percent of asphalt, 0.2 to 5 percent of anionic emulsifier, 0.02 to 3 percent of stabilizing agent, 0 to 4 percent of assistant, and the balance being water; and the wax content of the asphalt is less than or equal to 2.2 percent. The emulsified asphalt for the longitudinal connecting plate type ballastless track cement emulsified asphalt mortar has good emulsifying effect, is not only suitable for storage and usage under normal temperature environment, but also suitable for storage and usage under the environment of lower temperature or higher temperature, and has the advantages of good storage stability, strong temperature adaptability and the like; and the cement emulsified asphalt mortar prepared by the emulsified asphalt has the advantages of long working time, large temperature adapting range, no layering, good filling property, good physical-mechanical properties, good durability, and the like. The emulsified asphalt is applied to a plate type ballastless track, and in particular the longitudinal connecting plate type (CRTS II type) ballastless tracks of high-speed railways and passenger dedicated lines.

The invention discloses a low-temperature cured epoxy asphalt mortar and a preparation method thereof. The epoxy asphalt mortar comprises the following components in percentage by weight: 10-20% of refined bitumen, 5-15% of epoxy resin, 5-10% of solubilizer, 40-70% of aggregate and 3-10% of curing agent. The low-temperature cured epoxy asphalt mortar has simple preparation process, low equipment requirement and low use cost, can be constructed and cured at normal temperature, not only is convenient to construct, but also has low requirement for equipment and is convenient to popularize and apply.

The invention provides a method for identifying asphalt aging degree based on atomic force microscopy; the method comprises the steps of (1) acquiring a core sample from an old pavement, cutting the core sample layer by layer to obtain an asphalt mixture test specimen of different layers; (2) treating the mixture test specimen by means of 'cryopreservation and low temperature cutting' to obtain an asphalt mixture microscopic observation sample; (3) observing an asphalt mortar area of the sample to obtain an asphalt mortar modulus map; (4) quantitatively analyzing the above modulus map to obtain asphalt micro modulus value; (5) grading asphalt ageing degree and level according to the relationship between the asphalt micro modulus value and macroscopic asphalt pavement performance. The method according to the invention is simple and easy to perform and allows asphalt ageing degree to be identified directly, the complex extraction and recovery process is omitted, and a new research method and idea are provided for identifying asphalt ageing degree.

The invention provides the technical field of cast-in-place concrete pavement. Templates and a foundation are fixed through ground nails, a construction concrete vibrating operation platform spans the templates of two sides of the construction concrete vibrating operation platform, manual material distribution and preliminary concrete vibrating leveling can be carried out by using the construction concrete vibrating operation platform when feeding of local pump trucks is not in place; on the basis of the cast-in-place concrete water collecting and plastering surface, surface galling treatment is carried out, and rolling and galling to concrete are conducted through a concrete pavement galling device; when template joints are treated and reinforcing mesh is manufactured and installed in concrete pavement expansion joints, reserved joint supports are installed at the joints, when the cast-in-place concrete pavement is finished, a certain strength is reached, limit support strips are removed first, then the reserved joint supports are pulled out of upwards, the reserved expansion joints are cleaning up, and after curing of the concrete pavement is finished, the concrete pavement is thoroughly cleaned up and filled with joint filling materials such as asphalt mortar; and cast-in-place concrete needs to be cured after completion, an automatic spraying film laminating machine and coiling block curing films are used for spraying water and covering the curing films on the cast-in-place concrete pavement.

The invention provides emulsified asphalt for CRTS I and CRTS II slab ballastless tracks of high speed railways, passenger transport lines and interurban railways, and a preparation method of the emulsified asphalt. The emulsified asphalt comprises 55-65 parts of matrix asphalt or modified asphalt, 35-45 parts of water, 0.4-1.5 parts of cationic emulsifier, 0.3-1.2 parts of non-ionic emulsifier, 0.2-1.2 parts of amphoteric ionic emulsifier, 0.2-0.8 part of mineral emulsifier, 0.05-0.3 part of stabilizer, 0-0.2 part of thickener, 0-2.0 parts of pH modifier, and 0.1-1.2 parts of a polarity adjuster which is compounded of alkylamine and polycarboxylic acid surfactant. The emulsified asphalt has good storage stability and adaptability and also has the most significant characteristic that CRTS I and CRTS II cement-emulsified asphalt mortars can be prepared from the emulsified asphalt at the same time; two prepared mortars have good working performance, mechanical property and endurance quality; and the emulsified asphalt is suitable for the slab ballastless tracks, especially for the slab ballastless tracks of high speed railways, passenger transport lines and interurban railways.

The invention relates to a high-modulus asphalt concrete material doped with coal gasification slag. The high-modulus asphalt concrete material doped with the coal gasification slag is prepared from, by weight, 4.5-5.5 parts of polymer modified asphalt, 80-88 parts of aggregate, 10-20 parts of the coal gasification slag and 0.2-0.3 part of polyacrylonitrile fiber. The invention further provides a preparation method of the high-modulus asphalt concrete material doped with the coal gasification slag. The high-modulus asphalt concrete material doped with the coal gasification slag and the preparation method thereof have the advantages that the coal gasification slag is rich in graphite phase and good in compatibility with asphalt and improves the adhesivity of the asphalt and the aggregate; the elasticity modulus and stiffness modulus of asphalt mortar are increased, accumulated deformation of the mixture is reduced, and ruts of an asphalt concrete pavement are effectively restrained; the asphalt concrete material is doped with the polyacrylonitrile fiber, good bridging and reinforcing effects are achieved, high-temperature stability, low-temperature crack resistance, anti-fatigue performance and water stability of high-modulus asphalt concrete are further promoted, and the service life of the asphalt pavement is prolonged; the coal gasification slag is used in an environment-friendly way, and a successful model of green development is achieved.

The invention relates to a method for accurately evaluating a hot in-place recycling heating effect of an asphalt pavement based on a discrete element method, belongs to the technical field of hot recycling of the asphalt pavement and aims at solving the problem that the evaluation of the hot in-place recycling heating effect of the asphalt pavement is not accurate. The method comprises the following steps: firstly taking a core out of the pavement, defining the structural combination of the pavement and the type of gradation of each layer, collecting an aggregate distribution digital image of each layer, and converting to a CAD (computer aided design) image format after treatment; further introducing discrete element software, and respectively generating irregular aggregate and asphalt mortar according to positions of aggregate block bodies and the asphalt mortar in each structural layer; setting boundary conditions and aggregate and asphalt mortar thermophysical parameters, as well as intra-unit thermal contact resistance and interlayer contact parameters according to a hot in-place recycling heating way and distribution characteristics of a temperature field, and establishing a discrete element model of the pavement structure; and applying a constant heat flow with a certain temperature to the surface of the model, recording the changes in temperature at different times of each layer of the pavement structure, and combining with the temperature field and a distribution cloud picture of the heat flow to analyze the temperature field of the pavement structure and evaluate the hot in-place recycling heating effect.

The invention relates to the technical field of engineering construction and maintenance, in particular to an epoxy resin emulsified asphalt mortar coating which can be widely applied to the fields of surface water prevention, crack pouring, leakage mending, bonding, thermal insulation, freeze prevention, heat insulation, noise reduction and the like of highways, bridges and buildings, and is prepared by the following procedures: using double-component emulsified asphalt (containing 30-70 percent of solid asphalt) containing 10-60 percent of modified epoxy resin as the bonding and film forming material of the coating, adding 3-15 percent of hollow glass beads, adding 5-30 percent of aqueous epoxy resin curing agent and blending the mixture uniformly, and then adding ore sand or high-strength quartz sand (with particle size of 3-80 meshes) accounting for 100-200 percent of the total amount of the mixture into the improved epoxy resin emulsified asphalt mortar coating. The epoxy resin emulsified asphalt mortar coating has the advantages that the viscosity is low and the permeability is good; the ductility and the flexibility as well as the fatigue resistant strength of a condensate are great; and a coating formed after curing does not dissolve or stick the tire; the compression resistance, the water leakage prevention capability and the wear resistance of the road surface are improved, the friction coefficient of the road surface is increased, and the capabilities of noise reduction, heat insulation and frost crack prevention of the road surface are enhanced.

Provided is a prediction method of cement asphalt mortar compressive strength. The method aims at shortening an ensured cement asphalt (CA) mortar proportioning cycle, and through a mechanism study and an experimental analysis, parameters which can hardly affect the strength are emitted. A mass ratio mW / mC of water use amount and cement use amount and a mass ratio mA / mC of asphalt use amount and the cement use amount are used as calculating parameters which finally can be used for quantitatively calculating the compressive strength of the CA mortar. According to the method, through utilization of the parameters provided by the CA mortar mix ratio, 28d compressive strength of the CA mortar can be conveniently and quickly predicted, and a prediction result has good reliability.

The invention discloses an emulsified asphalt and a preparation method thereof. A formula of the emulsified asphalt comprises asphalt, a cationic emulsifier, an anionic emulsifier, a thickener, a stabilizer, a water reducing agent and water. According to the invention, the water reducing agent is added to asphalt emulsion as a component for not only playing the role of the reducing agent itself, reducing operation steps during construction, but also for cooperating with the cationic surfactant and the anionic surfactant, thus obviously improving sieve residual amount, storage stability and especially indexes of cement miscibility of the emulsified asphalt. The emulsified asphalt provided by the invention is used for cement asphalt mortar pouring of a plate-type ballastless track during construction of a high-speed railway.

The invention relates to a method for characterizing the degrees of miscibility of old and new asphalt based on dynamic moduli of mixtures. The method includes the steps that various performance indexes of RAP materials, matrix asphalt, aggregates and mineral powder are tested; hot mixing regenerated asphalt mixtures and specimens are prepared according to a current regeneration norm; the dynamicmodulus of each specimen is tested and a principal curve of the actually measured dynamic moduli is drawn; asphalt mortars with different degrees of miscibility of the old and new asphalt are preparedby adding different addition amounts of old asphalt and regenerating agents into the matrix asphalt; DSR tests are carried out on the different asphalt mortars to measure composite moduli and phase angles of the asphalt mortars; the dynamic moduli of the mixtures with different asphalt mortar states is predicted and the predicted principal curve of the dynamic moduli is drawn; and the degrees ofmiscibility of the old and new asphalt in regenerated mixtures are characterized. According to the method for characterizing the degrees of miscibility of the old and new asphalt based on the dynamicmoduli of the mixtures, the method of performance indirect testing with the greatest controllability is selected for research, influences of mixing factors, human errors and mineral aggregate gradation are eliminated as far as possible, and the test precision is improved.