956 results about "Pitch blende" patented technology

The utility model relates to the technical field of asphalt stirring processing, in particular to an asphalt mixture heating regeneration stirring cylinder and stirring equipment. The stirring device comprises a cylinder body, wherein a stirring cavity is formed in the cylinder body; the stirring assembly is arranged in the stirring cavity, the stirring assembly comprises a stirring shaft, the stirring shaft penetrates through the cylinder body and the stirring cavity, a plurality of stirring arms are evenly distributed on the part, located in the stirring cavity, of the stirring shaft, and stirring blades are arranged on the stirring arms; the cover plate is arranged on the stirring cavity, and a microwave heating magnetron is arranged on the cover plate. The microwave heating magnetron is arranged on the cover plate at the top of the stirring cylinder, and microwave energy is converted into heat energy, so that an asphalt mixture in the stirring cylinder is uniformly heated, the flowability of the asphalt mixture is improved, the bonding phenomenon of the inner wall of the stirring cylinder and the stirring shaft is reduced, and the uniform stirring condition of the asphalt mixture is greatly improved; the stirring quality and the production efficiency of the stirring shaft equipment are improved.

The invention discloses a composite modified waste cooking oil biological asphalt mixture and a preparation method thereof. The asphalt mixture comprises the following substances in percentage by mass: 4-7wt% of biological asphalt, 89-92wt% of aggregate, 2-3wt% of mixed mineral powder and 0.5-1.0 wt% of lignin fiber, the biological asphalt is prepared from the following substances in percentage by mass: 50 to 58 weight percent of matrix asphalt, 18 to 20 weight percent of waste cooking oil, 15 to 18 weight percent of mixed rubber powder, 2 to 2.5 weight percent of polymer modifier, 6 to 8 weight percent of mixed resin and 1 to 1.5 weight percent of additive. The preparation method comprises the following steps: preparing biological asphalt; respectively putting the aggregates with various grades of particle sizes, the mixed mineral powder and the biological asphalt into a drying oven for heating; sequentially putting the biological asphalt and the aggregate with various grades of particle sizes into a mixing pot, and mixing; sequentially adding the mixed mineral powder and the lignin fiber into the mixing pot, and continuously mixing to obtain the composite modified waste cooking oil biological asphalt mixture. The biological asphalt is prepared in a layer-by-layer progressive mode, and the technical problem that the doping amount of the waste cooking oil and the performance of the biological asphalt are difficult to achieve balance is solved.

The invention discloses a cold-mixed and cold-laid ultrathin overlay asphalt mixture which is prepared from the following raw materials in parts by weight: 8-15 parts of rubber powder composite emulsified asphalt; 80 to 90 parts of aggregate; 0.3 to 0.5 part of polymer fiber; 0.5 to 1 part of an interface coupling agent; the invention also provides a construction process of the cold-mixed and cold-laid ultrathin overlay asphalt mixture. The rubber powder composite emulsified asphalt is obtained by emulsifying the composite modified asphalt prepared from the ground rubber powder of the waste tires and the SBS rubber, so that the performance index of the emulsified asphalt is greatly improved, and the bonding performance of a cold-mixed thin-layer asphalt mixture and an original pavement is ensured; in addition, by adding the polymer fibers, the structural strength and the crack resistance of the ultrathin overlay can be remarkably improved. The invention can significantly reduce energy consumption and environmental pollution, and has the advantages of noise reduction, environmental protection, low cost and the like.

The invention discloses a solid waste-based cold-mixed asphalt mixture for preventive maintenance as well as a preparation method and application thereof, and belongs to the technical field of road engineering. The solid waste-based cold-mixed asphalt mixture is prepared from the following components in percentage by mass: 4.7 to 8.6 percent of modified cold-mixed asphalt adhesive, 85.8 to 93.9 percent of aggregate and 1.4 to 5.6 percent of composite filler, the modified cold-mixed asphalt adhesive is prepared from the following components in parts by weight: 86 to 96 parts of emulsified asphalt, 1 to 5 parts of bisphenol A type waterborne epoxy resin emulsion, 0.05 to 1 part of curing agent, 0.01 to 0.05 part of defoaming agent, 1.5 to 8 parts of waterborne polyurethane emulsion and 1 to 3 parts of hydroxypropyl methyl cellulose. The solid-waste-based cold-mixed asphalt mixture prepared by the method shows excellent comprehensive performance in high-temperature rut resistance, water damage resistance, freeze-thaw resistance, skid resistance, volume stability, interlayer shear resistance and the like, promotes reasonable utilization of solid waste resources, and has good economic and environmental benefits.

The invention provides an asphalt mixture cross-scale analysis method and system based on macro-micro characteristic coupling, and relates to the technical field of finite element analys.The method comprises the steps that cracking characteristics and mechanical properties of an asphalt mixture and the change relation of cracks along with time and the load state are obtained; constructing a mesoscale cracking model of the asphalt mixture, and establishing an asphalt mixture cracking criterion; simulating stress distribution in the asphalt mixture through an extended finite element, and reconstructing the meso-scale crack evolution behavior of the asphalt mixture to obtain a meso-scale stress distribution rule of the asphalt mixture; and fitting to obtain a macro-micro cross-scale coupling model of the crack damage of the asphalt mixture, and analyzing the cracking behaviors of the asphalt mixture under different scales based on the macro-micro cross-scale coupling model of the crack damage of the asphalt mixture. According to the method, macro-micro cross-scale analysis of the cracking behavior of the asphalt mixture can be realized.

The invention discloses an efficient preparation and construction optimization system and method for a cold patch asphalt mixture, and belongs to the technical field of construction optimization. Environmental parameters of a construction site are collected, including altitude, an air pressure correction coefficient and a light volatile factor, and a multi-scale mixture model coupled with air pressure response is constructed; analyzing the volatilization path, the structural stability and the initial bonding strength of the mixture in combination with discrete elements and fluid mechanics simulation, and further extracting a structural retention threshold value and reversely deducing the proportion adjustment amount of medium-high boiling point solvent components; meanwhile, a microcapsule controlled release technology is adopted to delay release of light components, adaptive construction parameters are output based on a simulation platform and a machine learning model, the paving temperature and the compaction frequency are dynamically optimized, and efficient cooperation and intelligent regulation and control of the cold patch material performance and the site construction technology are achieved.

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 an asphalt mixture, in particular to a modified heavy-load asphalt mixture based on a basalt fiber composite material as well as a preparation method and application of the modified heavy-load asphalt mixture. The modified heavy-load asphalt mixture based on the basalt fiber composite material is prepared from the following raw materials in parts by weight: 10 to 15 parts of asphalt, 1 to 3 parts of modified basalt fiber, 1 to 3 parts of aminated chitin whisker, 85 to 90 parts of mineral aggregate, 5 to 8 parts of hollow glass microspheres, 3 to 6 parts of compatilizer and 1 to 3 parts of stabilizer. Wherein the modified basalt fiber improves the low-temperature crack resistance, high-temperature rutting resistance and water stability of the asphalt mixture, and the aminated chitin whisker improves the fatigue resistance of the asphalt mixture.

The invention discloses a high-dosage RAP recycled asphalt mixture and a preparation method thereof, and the method comprises the following steps: step 1, carrying out homogenization treatment on an epoxy resin system and a rubber-asphalt composite system according to a weight ratio of 1: 5-1: 30 to obtain a composite modified asphalt system; 2, preheating the waste asphalt pavement material to 110-130 DEG C, performing dry mixing, adding a petroleum ether regenerant, heating to 150-170 DEG C, and performing dry mixing again to obtain a mixture 1; step 3, preheating new fine aggregate, coarse aggregate and steel slag in batches, adding into the mixture 1, and carrying out dry mixing to obtain a mixture 2 with a primary grading framework; step 4, adding the composite modified asphalt system prepared in the step 1 into the mixture 2, and performing wet mixing to obtain a mixture 3; and step 5, homogenizing the mixture 3 to finally obtain the target recycled asphalt mixture. The invention aims to realize high-mixing-amount recycling of the waste asphalt pavement material.

The invention discloses a lignin fiber reinforced environment-friendly asphalt mixture and a preparation method thereof, belongs to the technical field of asphalt preparation, and is used for solving the technical problem that the high temperature resistance and the tensile property of an asphalt mixture in the prior art need to be further improved. The composite lignin fiber modified asphalt is prepared from the following raw materials in parts by weight: 5 to 6 parts of matrix asphalt, 3 to 5 parts of composite lignin fiber, 2 to 4 parts of composite hollow microspheres and 81 to 102 parts of auxiliary materials, an organic metal framework is modified by utilizing a silane coupling agent, and a stable modification structure is formed on the modified lignin fiber by a modified hydrophobic framework through hydrolysis under an alkaline condition, so that the composite lignin fiber modified asphalt is obtained. The composite hollow microspheres are prepared through an emulsion polymerization method, and the composite hollow microspheres and the composite hollow microspheres are used as additives to be mixed with materials, so that the high-performance asphalt composite material is finally prepared.

The invention relates to the technical field of road material detection, in particular to a method for adjusting the mixing uniformity degree of a modulus agent in an asphalt mixture, and the method comprises the following steps: S1, weighing aggregate and a high modulus agent in proportion, preheating the aggregate, and stirring; s2, uniformly scattering a high-modulus agent into the preheated aggregate, mixing and stirring the high-modulus agent and the preheated aggregate to obtain an intermediate material I, and calculating the wrapping degree of the intermediate material I; s3, asphalt and aluminum powder are weighed in proportion, the asphalt is heated, then the aluminum powder is added, mixing is conducted, and a second intermediate material is obtained; s4, adding the intermediate material II into the intermediate material I, uniformly stirring, adding a proper amount of mineral powder, and continuously stirring to obtain a high-modulus asphalt mixture; s5, detecting the aluminum powder in the high-modulus asphalt mixture by using industrial CT (Computed Tomography) to obtain an image; s6, constructing a mixing uniformity prediction model, and predicting the AU; by predicting the optimal blending process parameters, the modulus adjusting agent is ensured to be uniformly blended in the asphalt mixture.

The invention relates to a low-viscosity reactive asphalt mixture cold mixing liquid which comprises the following components in parts by mass: 100 parts of matrix asphalt, 10-30 parts of solvent oil and 5-25 parts of single-component polyurethane, the asphalt mixture cold-mixing liquid can effectively reduce the viscosity of asphalt, and has good fluidity and stability, so that the prepared cold-mixed asphalt mixture has good construction workability and pavement performance.

The invention belongs to the technical field of engineering material detection, and particularly discloses an asphalt mixture dynamic water stability comprehensive detection system which comprises a standard test piece preparation module, a dynamic load loading module, a diffusion behavior analysis module, a sealing failure verification module and a water stability evaluation module. A detection area is limited through closed sealing treatment, a staged progressive increase dynamic load is applied to simulate an actual working condition, a three-dimensional moisture diffusion map is constructed to analyze diffusion behavior parameters, and a dynamic water stability grade evaluation result is generated in combination with an intelligent matching algorithm. According to the method, edge water seepage interference can be effectively avoided, the moisture diffusion process is accurately monitored, the performance of the asphalt mixture is comprehensively evaluated, and a scientific basis is provided for pavement structure design and material optimization.

The invention relates to the field of asphalt production equipment, in particular to an ultrathin bridge deck pavement high-performance asphalt mixture production device and process, and the ultrathin bridge deck pavement high-performance asphalt mixture production device comprises a mixing barrel which is connected to a base; the top and the bottom of the mixing barrel are respectively connected with the barrel cover and the discharge pipe; a mixing mechanism and a plurality of solid material feeding ports are arranged on the barrel cover, and the mixing mechanism is inserted into the material mixing barrel; the mixing mechanism is connected with a power mechanism arranged on the barrel cover; a matrix asphalt spraying mechanism is connected into the discharging pipe; the upper end of the matrix asphalt spraying mechanism is inserted into the mixing barrel; a heating mechanism is arranged at the bottom of the mixing barrel. The matrix asphalt spraying mechanism is arranged below the mixing barrel, and matrix asphalt can be sprayed into the mixing barrel through the matrix asphalt spraying mechanism, so that the matrix asphalt is headed and mixed with various fixed reinforcing materials falling from top to bottom, and the mixing uniformity of the fixed reinforcing materials and the matrix asphalt is improved.

The invention relates to a mix proportion design method of an MS-CAVF asphalt mixture. The mix proportion design method comprises the following steps: selecting raw materials; grading the coarse aggregate, and determining the use amount of the coarse aggregate in each grade through a partial normal distribution curve; measuring the apparent density # imgabs0 # of the coarse aggregate, the apparent density # imgabs1 # of the fine aggregate, the apparent density # imgabs2 # of the mineral powder, the asphalt density # imgabs3 # and the tight loading density # imgabs4 # of the coarse aggregate; the use amount of asphalt # imgabs 5 #, the use amount of mineral powder # imgabs 6 #, the use amount of cement # imgabs 7 # and the design void ratio # imgabs 8 # are initially prepared; and calculating the use amount # imgabs9 # of the coarse aggregate and the use amount # imgabs10 # of the fine aggregate by using a CAVF method, and calculating to obtain the synthetic gradation. The processing technology and quality of the coarse aggregate are improved, the CAVF method is combined with the optimal design of partial normal distribution gradation, and based on the wide-scale gap gradation design concept and the center particle size design concept, the embedding and extruding capacity of the asphalt mixture is improved, large internal friction resistance is formed, and the uniformity of the road surface structure is improved.

The invention relates to the technical field of road engineering, in particular to an aqueous solution surface energy parameter testing method based on a surface and interface tension method, which comprises the following steps: firstly, carrying out surface tension testing on a to-be-tested aqueous solution to obtain a surface tension coefficient of the to-be-tested aqueous solution; then selecting two organic reagents, respectively adding the two organic reagents into the two aqueous solutions to be tested, fully standing to form two different organic reagent-aqueous solution contact interfaces, respectively carrying out interfacial tension tests on the two interfaces, and obtaining interfacial tension coefficients of the contact interfaces of the aqueous solutions to be tested and the two organic reagents; and finally, substituting the surface tension coefficient, the two interfacial tension coefficients and the known surface energy parameters of the two organic reagents into an equation set based on a GvOC model, and solving and determining the surface energy parameters of the aqueous solution to be detected. According to the invention, the surface energy parameters of aqueous solutions with different pH values can be accurately tested, so that the water stability of the asphalt mixture in water environments with different pH values can be accurately and quantitatively evaluated.

To provide a test method capable of evaluating low-temperature crack resistance of asphalt pavement.SOLUTION: A test device in which a specimen made of an asphalt mixture whose both ends are grasped by a pair of jigs is placed inside a constant-temperature bath, a temperature of the constant-temperature bath is varied and which evaluates temperature stress acting on the specimen, includes: a strain gauge that is attached to the specimen; and a control mechanism that controls operations of the pair of jigs. The control mechanism acquires the strain of the specimen detected by the strain gauge for each prescribed time, and controls the operations of the pair of jigs so that the strain of the specimen detected by the strain gauge remains within a predetermined range on the basis of the acquired strain.SELECTED DRAWING: Figure 5

The utility model provides an asphalt mixture segregation detection device, which relates to the technical field of asphalt mixture detection and comprises a supporting mechanism, a density detection mechanism and an aggregate detection mechanism, the density detection mechanism comprises a supporting base and a mounting block, a weighing device is fixedly mounted at the top of the supporting base, and a graduated drum is fixedly arranged at the top of the weighing device. According to the utility model, the asphalt mixture is introduced into the graduated drum, when the graduated drum is filled with the asphalt mixture, the density is calculated by measuring the mass and the volume of the core sample, the density values of different areas are calculated after multiple sampling, and the resistance values of the asphalt mixture at different positions and in different areas are measured by using the force transducer; asphalt distribution uniformity is measured, aggregate cannot be fully lubricated in an area with little asphalt, the resistance value is large, then a temperature sensor is used for detecting the temperature of different parts of the mixture, and temperature difference possibly exists in a segregation area.

The invention relates to the technical field of modified steel slag powder, and discloses a preparation method of modified steel slag powder applied to a cold-mixed full-steel-slag asphalt mixture, which comprises the following preparation steps: 1) stirring and mixing 80-90 parts by mass of steel slag, 10-20 parts by mass of waste slurry powder particles and 1-2 parts by mass of triethanolamine in a stirring drum to form a mixture; 2) grinding the mixture in a ball mill for a set time to form powder; 3) drying the powder in a dryer to obtain modified steel slag powder; through the preparation steps, the activity, the particle distribution uniformity, the compatibility with the emulsified asphalt and the chemical stability of the modified steel slag powder are remarkably improved, so that a higher-quality material choice is provided for the application of the cold-mixed full-steel-slag asphalt mixture.

The invention discloses a preparation method of a wide-temperature-range multistage phase-change temperature-adjusting asphalt mixture. The preparation method comprises the following steps: respectively preparing a plurality of different composite organic eutectic phase-change materials; a plurality of different composite organic eutectic phase-change materials are compounded according to different proportions to obtain the wide-temperature-range multistage phase-change material. The wide-temperature-range multi-stage phase-change material is doped into an asphalt mixture according to the mass ratio of 3%-5%, and the wide-temperature-range multi-stage phase-change temperature-adjusting asphalt mixture is formed. The wide-temperature-range multi-stage phase-change temperature-adjusting asphalt mixture disclosed by the invention can continuously play a phase-change heat storage function in a high-temperature environment in summer, and achieves the effects of delaying the pavement temperature change rate, reducing the pavement maximum temperature, delaying the daily maximum appearance time, reducing the pavement surface temperature and improving the pavement temperature. Therefore, the urban heat island effect can be relieved, and the pavement durability is prolonged.

The present invention discloses a method for evaluating the load transfer behavior of asphalt mixture based on the quantification of force chain characteristics, comprising: (1) establishing a two-dimensional discrete element model of asphalt mixture according to the composition of the asphalt mixture; (2) performing a virtual bearing test on the discrete element model of the asphalt mixture to obtain contact information between aggregates and aggregate information; (3) setting a force chain formation standard according to the contact information between aggregates; (4) identifying the asphalt mixture force chains one by one based on the set force chain formation standard; (5) defining a force chain characteristic quantification index; (6) calculating the force chain characteristic quantification index; (7) evaluating the external load transfer behavior of the asphalt mixture according to the calculation result of the force chain characteristic quantification index; the present invention realizes the accurate evaluation of the load transfer behavior of the asphalt mixture from the perspective of the quantification of force chain characteristics.

The invention discloses an asphalt mixture component segmentation method, device and equipment, and relates to the technical field of asphalt pavement construction control, and the method comprises the steps: obtaining an initial two-dimensional image of an asphalt mixture section, and carrying out the preprocessing of the initial two-dimensional scanning image, and the preprocessing comprises the contrast enhancement and light field correction. Component division is carried out on the preprocessed image through a double-threshold segmentation method, morphological post-processing is carried out on the initial segmentation image, and each separated component segmentation image is obtained; and calculating the difference value between the image area ratio and the actual volume ratio of each component segmentation image, and calculating the relative error between the image screening grading and the actual screening grading of the aggregate components. When the difference value or the relative error exceeds the preset threshold range, the image processing parameters are adjusted, the segmentation operation is executed again, the target segmented image is obtained, the difference value and the relative error of the target segmented image are both within the preset threshold range, and the problem that the segmentation precision of the asphalt mixture components is insufficient is solved.

The invention belongs to the technical field of road traffic, and particularly relates to a wet mixing test method for measuring the skeleton void rate of a flowing mortar asphalt mixture. According to the method disclosed by the invention, a small amount of asphalt is added in the aggregate mixing process, so that the coarse and fine aggregates have certain adhesion capacity without influencing the arrangement of the coarse and fine aggregates, a certain lubrication effect is provided for the surfaces of the coarse aggregates with relatively large particles, and the influence caused by friction of the surfaces of the coarse aggregates is reduced; and finally, uniformly mixing the aggregate and the asphalt, pouring the mixture into a mold according to a set weight, and compacting by using a Marshall compactor or a rotary compactor, so that errors caused by human factors are reduced.

The invention provides an all-component multi-source solid waste asphalt mixture design method and system, and relates to the technical field of data processing, and the method comprises the steps: carrying out the preprocessing of obtained test proportion data of a solid waste asphalt mixture, and generating a mixture data set; screening the mixture data set by using a preset constraint condition to obtain a plurality of candidate matching points meeting the performance index characteristics; the performance index characteristics comprise gradation structure characteristics related to particle size, bonding system characteristics related to high-temperature fluidity and water sensitivity, molding volume and construction characteristics related to porosity and saturation, and context embedding characteristics related to a service scene; splicing the performance index features and inputting the spliced performance index features into a trained gating expert network to obtain a corresponding performance prediction mean value and a performance fluctuation mean value; and performing reliability analysis on the candidate matching points based on the performance prediction mean value and the performance fluctuation mean value, and determining the candidate matching points of which the reliability is greater than a preset threshold value as target matching points.

The invention relates to the technical field of asphalt mixtures, and provides a high-strength asphalt mixture and a preparation method thereof.The asphalt mixture is prepared from, by weight, 50 parts of asphalt, 800-900 parts of basalt aggregate, 50-100 parts of limestone mineral powder and 5-10 parts of modified lignin fiber; the raw materials of the modified lignin fiber comprise a methyl methacrylate-styrene copolymer and lignin fiber in a weight ratio of (5-10): 95. According to the technical scheme, the problem that the strength and the rutting resistance of the asphalt mixture are poor due to poor dispersity of lignin fibers in the prior art is solved.

The invention discloses a hard asphalt mixture and a preparation method thereof, and belongs to the technical field of road engineering materials. Aiming at the problems of insufficient strength, stability and durability of the existing hard asphalt mixture, the method comprises the following steps: grading and mixing basalt and diabase composite coarse aggregate, medium aggregate with a specific ratio, fine aggregate containing basalt mineral fibers and limestone mineral powder; the preparation method comprises the following steps: heating to 175-185 DEG C, adding modified asphalt prepared by shearing and blending matrix asphalt and a styrene-butadiene-styrene block copolymer modifier, carrying out dry mixing and wet mixing, scattering lignin fibers, and carrying out thermal insulation aging and three-stage compaction molding. Wherein the rotating speed and time of dry mixing and wet mixing are controlled, the compaction is divided into initial pressing, re-pressing and final pressing stages, and different pressures are set. According to the preparation method, the performance of the mixture is improved by optimizing aggregate composition, a modified asphalt process and mixing and compacting parameters, and the preparation method is mainly used for road engineering construction with high requirements on pavement strength and stability.

The invention belongs to the technical field of RAP recycled asphalt mixtures, and particularly relates to a high-dosage RAP recycled asphalt mixture for alpine regions and a preparation method of the high-dosage RAP recycled asphalt mixture. The high-dosage RAP recycled asphalt mixture for the alpine region is characterized by comprising the following components in percentage by mass: 50-60% of RAP, 3-6% of mineral powder, 1-3% of new asphalt, 1-2% of a composite regenerant, 1-2% of a modifier and the balance of a new aggregate, the composite regenerant is composed of pine tar, plant-based epoxy ester oil, cashew nut shell oil and a penetrant. The modifier is prepared from regenerated low-density polyvinyl chloride, hyperbranched epoxy resin and liquid polybutadiene rubber coated waste rubber powder. According to the technical scheme provided by the invention, the technical problems of poor low-temperature performance, water stability and freeze-thaw cycle stability when a high-dosage RAP recycled asphalt mixture is used in an alpine region are solved.

The invention relates to the technical field of asphalt mixtures, and discloses a preparation method of a cold-mixed full-steel-slag asphalt mixture, which comprises the following preparation steps: 1) adding coarse steel slag and fine steel slag into an asphalt stirring pot according to parts by mass, and stirring to form mixed steel slag; 2) stirring and mixing the modified steel slag powder, polydimethylsiloxane, fly ash, hydrogen peroxide and the mixed steel slag in parts by mass to form a first part of mixture, and taking out the first part of mixture for later use; (3) stirring the emulsified asphalt, the water-borne epoxy resin, the water-borne curing agent and the defoaming agent in parts by mass to form a secondary mixture; 4) stirring and mixing the first part of mixture and the second part of mixture, then adding the modified steel slag powder, and stirring and mixing to form a cold-mixed full-steel-slag asphalt mixture; through specific preparation steps and material proportioning, the performance of the cold-mixed full-steel-slag asphalt mixture is comprehensively optimized, and the construction workability, durability, fatigue resistance and water damage resistance are improved.

The invention discloses a gradient pore structure geopolymer asphalt mixture warm mixing agent which is composed of the following components in parts by weight: 65-85 parts of regenerated micro powder, 15-35 parts of rice hull ash, 15-20 parts of a sodium silicate solution, 5-10 parts of sodium hydroxide and 10-20 parts of deionized water. The invention also discloses a preparation method of the geopolymer asphalt mixture warm mixing agent. The geopolymer asphalt mixture warm-mixing agent has a gradient pore structure and has no closed pores or semi-closed pores, so that the water carrying capacity in the geopolymer asphalt mixture warm-mixing agent can be greatly improved, and the pore structure is arranged in a gradient manner (gradually released from large pores to small pores), so that the water release period of the warm-mixing agent can be effectively prolonged, and meanwhile, the water release rate can be uniform; compared with a hot-mixed asphalt mixture, the geopolymer asphalt warm-mixing agent with the gradient pore structure has the advantages that the mixing temperature of the asphalt mixture can be remarkably reduced, and meanwhile, the high and low temperature performance, the water damage resistance and the fatigue resistance of the asphalt mixture can be improved.

The invention provides a method and a device for evaluating low-temperature performance under the expansion characteristic of a steel slag asphalt mixture, and relates to the field of road engineering. The method comprises the following steps: acquiring a first volume expansion rate data set in a first time period according to the type of a target mixture test piece; according to the first volume expansion rate data set, a second volume expansion rate data set of the target mixture test piece in the second time period is obtained through a volume expansion rate prediction model; according to the first volume expansion rate data set and the second volume expansion rate data set, low-temperature performance evaluation index data under the expansion rate corresponding to the target mixture test piece are obtained through the target testing device; performing principal component optimization on the index data through a principal component analysis method, and obtaining low-temperature performance evaluation index data corresponding to the optimized expansion rate; and performing low-temperature performance evaluation operation by optimizing the low-temperature performance evaluation index data corresponding to the expansion rate. The problem that low-temperature performance judgment is inaccurate in an existing low-temperature performance testing method is solved.