3774 results about "Pitch" patented technology

The invention discloses an asphalt-based hard carbon material as well as a pre-oxidation preparation method and application thereof. Belongs to the technical field of asphalt-based hard carbon materials. The pre-oxidation preparation method comprises the following steps: carrying out primary pre-oxidation treatment on asphalt at 250-400 DEG C in air flow of 50-500mL / min; crushing the obtained primary pre-oxidized asphalt, and then carrying out secondary pre-oxidation treatment at 250-400 DEG C in air flow of 50-500mL / min to obtain secondary pre-oxidized asphalt; and carrying out carbonization treatment on the secondary pre-oxidized asphalt. According to the method, the asphalt can be kept in a solid-phase state to be subjected to efficient and thorough oxidation cross-linking reaction, the production cost is reduced, the obtained asphalt-based hard carbon material has high first coulombic efficiency and high capacity, and powerful support is provided for commercial application of sodium-ion battery negative electrode materials and rapid development of an energy storage technology.

The invention discloses a tunnel boring machine (TBM) tunneling method for a large-diameter inclined shaft under a deep coal mine well, belongs to the technical field of mine construction engineering and tunnel tunneling, and aims to solve the problems of poor axis control precision and deviation correction response lag caused by the fact that an existing method depends on manpower and cannot integrate geology and inclination angle information for self-adaptive thrust distribution. The surrounding rock strength grade is judged according to the torque and the speed by collecting the cutterhead torque, the rotating speed, the total propulsive force and the pitch angle in real time; calculating a gravity component force and an unstable moment by combining the pitch angle, and calculating a required deviation correction moment according to the real-time angle deviation; a pre-stored data table is inquired based on the pitch angle, the surrounding rock grade and the deviation rectifying torque, and the target pressure distribution proportion of the upper and lower partition oil cylinders is dynamically generated; and finally, the total propulsive force set value is decomposed according to the proportion, the pressure of an oil cylinder is adjusted through independent closed-loop control, and self-adaptive accurate control over the pitch attitude is achieved. The method is mainly used for improving the axis control precision and stability of the large-diameter inclined shaft TBM construction of the deep coal mine.

The invention belongs to the technical field of asphalt pavement repairing, and particularly relates to a local repairing technology of an asphalt pavement, which comprises the following specific contents: detecting a disease range by adopting ground three-dimensional laser scanning or ground penetrating radar, determining a repairing boundary, sampling and detecting the aging degree, the moisture content and the grading type of the asphalt of the original pavement, and determining the repairing quality of the asphalt pavement. According to the method, the bonding strength of the repairing material and the asphalt layer of the original pavement is enhanced by heating and activating the interface of the original pavement and emulsifying the asphalt bonding layer, and matching the repairing material with the shrinkage coefficient of the original pavement and reinforcing and compacting the edge, so that the condition that the repaired position is cracked, loosened and damaged in a short time is avoided; warm-mixed asphalt is adopted, the heating temperature is reduced by 40-60 DEG C, cold-mixed emulsified asphalt is popularized, and the asphalt does not need to be heated, so that release of a large amount of volatile organic compounds (VOCs), polycyclic aromatic hydrocarbons (PAHs) and dust is effectively avoided, and air pollution is avoided.

The invention discloses an iron alloy electrode paste and a preparation process, and belongs to the technical field of electrode paste preparation, the iron alloy electrode paste comprises a composite aggregate system and a composite binder system, the composite aggregate system comprises the following components by mass: 40-60% of anthracite aggregate, 15-25% of artificial graphite flake, and 3-8% of silicon carbide whisker; the composite binder system comprises the following components in percentage by mass: 70-80% of medium-temperature modified coal pitch, 10-15% of furan resin and 5-10% of dispersion liquid containing nano boron carbide, and the composite binder system is combined with the composite aggregate system through a gradient permeation process to form a three-dimensional conductive network and an enhanced interface; the composite aggregate system and the composite binder system are optimally proportioned, and gradient permeation and gradient kneading processes are combined, so that the comprehensive performance of the electrode paste is remarkably improved, the thermal shock resistance is greatly improved and the linear shrinkage rate is reduced while low resistivity is maintained, the electrode paste is suitable for smelting ferroalloys such as silicomanganese and ferrochromium, and the service life is remarkably prolonged.

The invention relates to the technical field of asphalt production, in particular to a directly modified rubber powder asphalt production reaction device which comprises a reaction kettle, a stirring shaft is rotatably arranged in the reaction kettle, a plurality of stirring rods are arranged on the outer side of the stirring shaft, a plurality of expansion rods are rotatably arranged on the outer sides of the stirring rods, the stirring shaft is of a hollow structure, and the expansion rods are arranged on the outer side of the stirring shaft. An angle adjusting unit for driving the stirring rod to rotate is arranged in the stirring rod, a driving unit for driving the expansion rod to unfold on the outer side of the stirring rod is arranged in the stirring rod, and a plurality of temperature sensors are arranged on the inner wall of the reaction kettle. Diffusion of the modifier on a high-temperature low-viscosity surface layer is accelerated, film formation and gas retention are prevented, and uneven mixing caused by bubbles is reduced; the bottom stirring rods are small in unfolding angle, so that the bottom shearing strength is reduced, excessive stirring of deposited aggregate or modifier particles is avoided, and stable flowing of the bottom layer is maintained.

The invention provides a three-order angular distance extraction-based emulsified asphalt polymer distribution uniformity evaluation method, which comprises the following steps of: acquiring a fluorescent microphotograph of an emulsified asphalt polymer modified sample, carrying out RGB three-channel separation, constructing a joint probability matrix with a gray vector on polar coordinates, and simultaneously carrying out normalization processing; and further calculating a first-order angular moment, a second-order angular moment and a third-order angular moment of the fluorescent microscopic image of the emulsified asphalt polymer modified sample according to the joint probability matrix of the gray vector, and evaluating the distribution uniformity of the polymer in the emulsified asphalt matrix. The method can accurately quantify the distribution uniformity of the polymer in the emulsified asphalt, is small in test sampling amount and high in test speed, can be widely applied to quality detection of the emulsified asphalt in road engineering construction and maintenance, and provides an effective technical means for improving the modification effect of the polymer of the emulsified asphalt and guiding optimization of a preparation process of the emulsified asphalt.

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 waste gas treatment, and discloses an asphalt smoke treatment device for highway construction, the asphalt smoke treatment device comprises a spray tower body, a filter unit and a spray unit, the filter unit and the spray unit are both located in the spray tower body, and the filter unit can intercept and filter large particles in asphalt smoke entering the spray tower body. The first filter plate mechanism and the second filter plate mechanism are arranged in the spray tower body, double interception of large particles of asphalt smoke is achieved through an interception plate A and an interception plate B, a guide rod is matched to drive an ejector rod on a blockage clearing disc to accurately penetrate through a filter hole for blockage clearing, and a rotating ring slides and rotates along with the guide rod and drives the clearing plate to scrape impurities at the bottom of the interception plate; the power driving equipment controls the filter plate to deflect to assist in impurity falling, so that the problem that the spraying effect is influenced by increased filtering resistance and non-uniform impurity distribution caused by blockage of filter holes in the background art is effectively solved, the airflow circulation efficiency is guaranteed, and stable conditions are provided for subsequent spraying purification.

The invention provides low-temperature-resistant high-modulus rubber asphalt and a preparation method thereof, and relates to the technical field of rubber asphalt, and preparation raw materials of the low-temperature-resistant high-modulus rubber asphalt comprise the following components: matrix asphalt, rubber powder, a desulfurizer, a free radical type thermal initiation crosslinking agent, a reinforcing agent, a coupling agent, a flexibilizer, a viscosity reducer and an auxiliary agent. According to the low-temperature-resistant high-modulus rubber asphalt provided by the invention, the ductility at 5 DEG C is greater than 30cm, the maximum breaking flexural-tensile strain of a mixture at-10 DEG C is greater than 4000 mu epsilon, the dynamic modulus of the mixture at 15 DEG C is greater than 15000MPa, and the high-temperature performance and modulus of high-modulus asphalt concrete are not reduced while the crack resistance of the high-modulus asphalt concrete is helped to be improved. When being applied to pavement middle layer pavement, the pavement anti-cracking agent can improve the anti-cracking performance of the whole pavement structure, reduce the pavement maintenance cost and improve the driving safety.

The invention provides tail gas treatment equipment for rubber asphalt production, which comprises a treatment tank, and further comprises an inner cylinder arranged on the inner side of the treatment tank, and the upper part of the inner side of the inner cylinder is provided with a fine filter screen and a coarse filter screen; a plurality of cleaning pipes are circumferentially distributed and mounted on the rotating shaft on the upper side of the coarse filter screen, cleaning brushes are mounted on the lower sides of the cleaning pipes, blowing holes are formed in the lower sides of the cleaning pipes, a plurality of reverse blowing pipes are circumferentially distributed and mounted on the rotating shaft on the lower side of the fine filter screen, and blowing heads are mounted on the upper sides of the reverse blowing pipes; the pressure relief reverse blowing mechanism is used for conveying compressed air to the inner cavity of the rotating shaft; and the regulation and control mechanism is used for controlling and regulating air in the inner cavity of the rotating shaft to be conveyed to the cleaning pipe and the reverse blowing pipe. Through graded filtration of the double-layer filter screen and cooperative dust removal of the cleaning brush and the reverse blowing nozzle, particulate matters are effectively intercepted, long-acting smoothness of the filter screen is ensured, and the tail gas purification efficiency and the system operation stability are improved.

The utility model relates to the technical field of coated asphalt production, in particular to a reaction kettle for heating high-soft-point coated asphalt, which comprises a kettle cover body, a reaction kettle body, a middle stirring shaft and an auxiliary stirring frame, the middle stirring shaft and the auxiliary stirring frame are mounted in the reaction kettle body, a planetary gear driving device is arranged at the upper end of the kettle cover body, and a driving motor is arranged at the upper end of the planetary gear driving device. And the driving motor is connected with the middle stirring shaft and can drive the middle stirring shaft to rotate. The stirring device is reasonable and compact in structure and convenient to use, the auxiliary stirring frame is driven by the planetary gear driving device to rotate, so that asphalt adhered to the side wall is effectively cleaned by the side scraping plate, and the effect of stirring mixed materials can be achieved; the auxiliary frame stirring blades on the auxiliary stirring frame and the middle shaft stirring blades of the middle stirring shaft are alternately distributed and form differential rotation, so that the stirring effect is effectively improved, materials at the bottom of the reaction kettle body are fully stirred through the lower scraping plate, the materials are prevented from sinking to the bottom, and the reaction kettle has the characteristics of high stirring efficiency, good stirring effect, simplicity, convenience, reliability and high efficiency.

The invention belongs to the technical field of sodium ion battery negative electrode material preparation, and particularly relates to an asphalt-based hard carbon material and a preparation method and application thereof, a negative electrode material and a preparation method thereof, and a sodium ion battery. In order to realize controllable preparation of high-value conversion, highly disordered and low-cost hard carbon of coal pitch, asphalt is used as a precursor material, modified asphalt is synthesized under the action of a solvent, a cross-linking agent and a catalyst, the hard carbon material is prepared through carbonization, and the hard carbon material is large in interlayer spacing and high in disordered degree and is accompanied with defects and closed pores, so that the high-value conversion, highly disordered and low-cost hard carbon is prepared. The preparation method is beneficial to reversible storage of sodium ions and improvement of the electrochemical performance of the sodium-ion battery, so that the sodium-ion battery is fully mixed with a conductive agent, an adhesive and deionized water to prepare slurry, the slurry is uniformly coated on a copper foil in a blade coating manner and is subjected to vacuum drying to prepare a negative electrode material, and the negative electrode material is matched with a corresponding counter electrode, electrolyte and a diaphragm to assemble the battery. The battery is low in cost, high in safety performance, relatively long in cycle life, high in rate capability and good in environmental sustainability.

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 discloses an epoxy resin modified emulsified asphalt micro-surfacing mixture and a preparation method thereof.The preparation method comprises the steps that matrix asphalt is subjected to gradient heating to 75-90 DEG C, nano silicon dioxide is added, stirring and shearing are conducted, and activated matrix asphalt is obtained; preparing a water-borne epoxy resin emulsion with the solid content of 45-50%, and controlling the mass ratio of epoxy resin to an emulsifier to be (8-10): 1 to form a stable dispersion system with the particle size of less than or equal to 1 mu m; preheating the mineral aggregate, adding the activated matrix asphalt while stirring, and continuing stirring; adding the water-borne epoxy resin emulsion, and continuously stirring; adding a vinylamine curing agent, continuously stirring to ensure that the curing agent is uniformly dispersed and avoid partial incomplete reaction, finally adding cement and water, and continuously stirring to form a uniform micro-surfacing mixture. The pavement performance such as high-temperature stability, low-temperature crack resistance and the like is remarkably improved through raw material system upgrading and process innovation, VOCs emission is greatly reduced, and green and environment-friendly effects are achieved.

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 sodium ion batteries, and discloses plant tar phenolic resin in-situ modified asphalt and a method for preparing a hard carbon material by using the plant tar phenolic resin in-situ modified asphalt. The preparation process of the method comprises the following steps: (1) mixing and dispersing; (2) carrying out hydrothermal polymerization; and (3) high-temperature carbonization. The plant tar is used as a raw material, low-cost phenolic resin is prepared through a hydrothermal reaction, asphalt molecules are doped in situ in the synthesis process, the asphalt molecules participate in the cross-linking process, a more complex mixed polymer is formed, the graphitization process in the high-temperature carbonization process is inhibited, and the high-performance phenolic resin is prepared. And finally, the sodium ion battery negative electrode hard carbon material with excellent sodium storage capacity and good cycle performance is prepared. The raw materials are wide in source, the production cost of the hard carbon material is remarkably reduced, the method has a wide mass production prospect, and an economical and efficient technical scheme is provided for industrial application of the hard carbon material.

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

A fiber asphalt flexible anti-crack seal parameter type selection and design method comprises the following steps: S1, establishing a strength prediction model: combining feature design and a support vector machine algorithm, and constructing nonlinear coupling features of asphalt consumption, fiber consumption and fiber length to obtain a strength prediction model; training the support vector regression model to obtain a prediction model of the tensile strength of the bridge deck waterproof layer under different material combinations; s2, establishing a waterproof performance theoretical model of the waterproof layer: obtaining a function relationship among the equivalent stress length of the waterproof layer, the thickness of the waterproof layer and the tensile strength based on a cracking principle of the waterproof layer and stress balance of the waterproof layer, obtaining a theoretical model of the critical crack width Wt of the waterproof layer and a waterproof performance correlation coefficient of the waterproof layer combined by different materials; and S3, designing the waterproof layer of the bridge deck slab: selecting a material combination of the waterproof layer with the optimal economical efficiency based on the crack width of the bridge deck slab in combination with the prediction model of the tensile strength of the waterproof layer of the bridge deck slab and the waterproof performance theoretical model of the cracked waterproof layer of the bridge deck slab.

The invention provides a free radical excited cross-linked composite hard carbon material as well as a preparation method and application thereof, and relates to the technical field of negative electrode materials. The composite hard carbon material is prepared from lignin and asphaltene as raw materials through lignin activation, wet ball milling, drying and calcination. Through the preparation method of free radical pre-excitation-wet ball-milling crosslinking, collaborative optimization of the sodium storage capacity, the first-week coulombic efficiency, the cycling stability and the rate capability of the composite hard carbon material is realized. Moreover, the preparation process of the composite hard carbon material provided by the invention has the advantages of good process stability, strong controllability, low cost, environmental friendliness and the like, is easy for large-scale production, meets the technical index requirements of industrial application of sodium ion batteries, and has a wide market application prospect.

The invention discloses a plant oil-based self-healing asphalt modifier based on dynamic crosslinking and a preparation method and application thereof, and belongs to the technical field of plant oil-based modifiers. The preparation method of the plant oil-based self-healing asphalt modifier based on dynamic crosslinking comprises the following steps: fully swelling a styrene thermoplastic elastomer in plant oil; swelling gel is obtained; a cross-linking agent and a vulcanization accelerator are added into the swelling gel, and the plant oil-based self-healing asphalt modifier is obtained through a vulcanization reaction; the plant oil-based self-healing asphalt modifier based on dynamic crosslinking provided by the invention is simple in preparation method, and compared with traditional SBS modified asphalt, the plant oil-based self-healing asphalt modifier has more excellent temperature sensitivity, self-healing property and storage stability, the construction process is lower-carbon and more environment-friendly, and the plant oil-based self-healing asphalt modifier has excellent environmental benefits.

The invention discloses an intelligent temperature control production system for an environment-friendly asphalt cold patch additive, and relates to the technical field of asphalt cold patch additive production, and the system comprises a controller initial modeling module which is used for recording the currently set proportional-integral-differential controller parameters, and constructing a reference control feature vector used for representing the initial response behavior of a controller; and the thermal load response identification module is used for applying micro-amplitude step type temperature disturbance to the to-be-heated environment-friendly asphalt cold patch additive and extracting a thermal load characteristic vector representing the thermal response characteristic of the additive. According to the method, intelligent matching and full-time-domain response evaluation are realized by constructing control and thermal load feature vectors and combining cross-correlation and grey correlation analysis; a sliding spectrum entropy and self-adaptive parameter correction mechanism is introduced, a closed-loop regulation system is constructed, the suitability, stability and additive dispersing performance of a temperature control system are effectively improved, and the problems of control lag and fluctuation are solved.

The invention relates to the technical field of vertical shaft guide detection, in particular to an industrial intelligent visual detection and diagnosis system for a vertical shaft guide. The coal dust shadow quantization unit extracts a coal dust region by adopting a double-peak self-adaptive threshold segmentation combined region growing algorithm, and introduces a space weight factor to calculate an average gray value and a coverage area proportion, and the dynamic coupling calibration unit depends on a three-dimensional lookup table calibrated by multiple working conditions and nonlinear interpolation; the optimal deviation compensation coefficient of the jitter and coal dust combination is matched, a dynamic gray segmentation threshold value is generated, and a defect diagnosis decision unit accurately calculates the abrasion depth through partition self-adaptive segmentation, multi-scale morphological filtering and denoising and gradient amplitude and curvature double-constrained sub-pixel edge detection. A hierarchical control instruction is output according to the real-time depth and the historical trend, coupling interference is eliminated, the cage guide abrasion detection accuracy is improved, and a reliable basis is provided for safe operation and maintenance.

The invention discloses an environment-friendly construction method for in-situ cold regeneration of foamed asphalt based on old material regeneration, aims to solve the problems of unstable performance of a mixture and insufficient utilization of old materials caused by diverse characteristics of the old materials in a traditional in-situ cold regeneration process of the foamed asphalt, and provides a dynamic adaptive construction method. The method comprises the following steps: firstly, detecting the passing rates of 19mm and 0.075 mm sieve pores of an old material and the penetration of asphalt at 25 DEG C; dividing into three grades according to grading, and dividing the aging degree into three degrees; dynamically adjusting the mix proportion, the pre-wetting parameters of the bio-oil-based regenerant and the old material doping temperature according to grading; according to the method, the performance of the regenerated mixture is ensured, the utilization rate of old materials is increased, and the method has both environmental protection and economic benefits.

The invention provides self-adhesive modified asphalt, a self-adhesive modified asphalt waterproof coiled material and a preparation method of the self-adhesive modified asphalt waterproof coiled material, and belongs to the technical field of asphalt and waterproof coiled materials. The self-adhesive modified asphalt is prepared from the following components in percentage by weight: 3 to 30 weight percent of matrix asphalt, 20 to 30 weight percent of aromatic hydrocarbon oil, 3 to 5 weight percent of thermoplastic elastomer, 5 to 8 weight percent of rubber modifier, 5 to 10 weight percent of tackifying resin, 3 to 8 weight percent of dioctyl sodium sulfosuccinate, 1 to 3 weight percent of polyaluminum ferric chloride, 1 to 3 weight percent of ferroferric oxide and 0.5 to 1 weight percent of limestone powder, and 10 to 30 wt% of an inorganic filler.

The invention discloses a moisture-proof and heat-insulating refractory material and a preparation method thereof, and relates to the technical field of refractory materials, and the moisture-proof and heat-insulating refractory material comprises dolomite, nano silicon dioxide, silica, an anhydrous binder and a moisture-proof agent. The synthesized moisture-proof agent is obtained by modifying asphalt through modified SBS obtained by grafting SBS and a monomer product containing terminal carbon-carbon double bonds, phosphate and a phthalonitrile structure, and has excellent flame retardance, high temperature resistance and waterproofness. And by using the nano silicon dioxide, the heat insulation performance of the refractory material can meet the requirements. The refractory material disclosed by the invention is excellent in refractoriness and moisture resistance and worthy of popularization and application.

The invention relates to the technical field of road engineering, in particular to an all-solid waste rubber-based composite modified foam cold recycled asphalt mixture and a preparation method thereof, and the all-solid waste rubber-based composite modified foam cold recycled asphalt mixture comprises the following components in parts by mass: 150-200 parts of graded precisely-controlled recycled aggregate, 10-25 parts of recycled mineral activity enhancing powder, 5-10 parts of an industrial solid waste reinforcing agent and 20-40 parts of solid waste-based recycled foam asphalt. The mixture utilizes various solid wastes for recycling, has excellent pavement performance, high strength, crack resistance and durability, can be constructed at normal temperature or low temperature, and is low in energy consumption and environment-friendly. Through composite modification of foamed asphalt and rubber powder, early strength and stability are significantly improved, the problem of slow development of early strength of a cold recycled material is overcome, the construction period is shortened, and traffic is quickly opened. The method is simple in process, low in cost and convenient to construct, meets the requirements of green and low-carbon construction, provides a new way for the double-carbon target in the traffic field, and is remarkable in economic and social benefits and wide in application prospect.

The invention discloses nano-composite high-viscosity and high-stability modified asphalt and a preparation method thereof, and belongs to the technical field of road engineering materials. The modified asphalt is prepared from the following raw materials in parts by weight: 100 parts of matrix asphalt, 3 to 10 parts of star-shaped SBS (Styrene Butadiene Styrene), 5 to 25 parts of waste tire rubber powder, 2 to 6 parts of C5 / C9 petroleum resin, 2 to 8 parts of naphthenic oil, 0.1 to 0.5 part of sulfur, 1 to 3 parts of organic montmorillonite, and 0.5 to 2 parts of optional maleic anhydride grafted polypropylene and / or 0.1 to 0.5 part of silane coupling agent. The core of the preparation method is that through a three-stage process of swelling and nano dispersion, development and interface reaction and cross-linking stabilization, the technical problems of poor compatibility and easy segregation of an SBS / rubber powder composite system are fundamentally solved by utilizing the physical barrier effect of a nano sheet layer and the synergistic effect of vulcanization / interface chemical bonding. The obtained product has ultrahigh viscosity (dynamic viscosity gt at 60 DEG C, 80000 Pa.s), excellent storage stability (segregation error 1t at 48 hours, 2.0 DEG C) and excellent aging resistance, and the comprehensive performance of the product is far better than that of the prior art.

The invention discloses a fracturing control method for tunneling roadway surrounding rocks in a near-distance coal seam excavation working area, which comprises the following steps of: calculating a working area stress superposition influence range when near-distance coal seam excavation is performed oppositely, and arranging fracturing drill holes to carry out fracturing stress transfer on a top plate and an interlayer hard rock stratum in the excavation working area. In the excavation drift stress superposition influence range, an overlying hard roof is cut off through fracturing of an upper coal seam working face mining roadway, the weighting step pitch and weighting strength of roof fracture are reduced, and the mining-induced stress transmitted to a lower coal seam tunneling roadway is reduced; the interlayer hard rock stratum is fractured and cut off in the lower coal seam track high drainage roadway to block stress transfer, mining-induced stress superposition of upper coal seam working face stoping and lower coal seam roadway tunneling is weakened, and the stress concentration degree of a mining drift area is reduced. According to the method, the influence of mining-induced stress superposition in a near-distance coal seam mining intersection area on lower coal seam roadway tunneling and upper coal seam working face mining roadway is reduced, and normal mining of an upper coal seam working face and normal tunneling of a lower coal seam working face roadway are guaranteed.

The invention discloses a waste asphalt mixture separation system and a recovery method, and the system comprises a separation box body, and a low temperature control assembly, a solvent storage assembly and a feeding assembly which are communicated with the separation box body; the low-temperature control assembly is used for controlling the interior of the separation box body to be in a preset low-temperature state; the feeding assembly is used for providing a target waste asphalt mixture into the separation box body; the solvent storage assembly is used for providing a target separation solvent into the separation box body, so that asphalt in a target waste asphalt mixture is separated from aggregate through the target separation solvent; a screening assembly and a vibration crushing assembly are arranged at the bottom of the separation box body, and the vibration crushing assembly is located below the screening assembly; the screening assembly is used for screening the separated aggregate; the vibration crushing assembly generates crushing force (breaking bonding of asphalt and aggregate) and centrifugal power (assisting aggregate screening) through vibration. The invention aims to effectively separate and recover the waste asphalt mixture.

The invention relates to the technical field of asphalt, and particularly discloses modified asphalt for drilling fluid and a preparation method of the modified asphalt, and the modified asphalt comprises the following components in parts by weight: 100 parts of matrix asphalt, 12-15 parts of sulfonated modified monomer, 3-5 parts of zwitterionic modified monomer, 2-3 parts of crosslinking modifier, 3-5 parts of environment-friendly activating aid, 2-4 parts of neutralization regulator and 90-110 parts of deionized water. The preparation method comprises the following steps: firstly, melting and activating the matrix asphalt, and adding the environment-friendly activating aid to prepare the activated asphalt; carrying out gradient heating, and adding a sulfonated modified monomer, a zwitterionic modified monomer and a cross-linking modifier step by step to complete composite cross-linking modification; and finally, cooling, adding a neutralization regulator to adjust the pH value, adding deionized water, performing high-speed shearing and homogenizing, and cooling to obtain a finished product. The modified asphalt is stable and controllable in viscosity, excellent in high and low temperature filtration loss control performance, adaptive to complex drilling working conditions, environment-friendly in process and easy to implement.