6577 results about "Pitch" patented technology

The invention provides a hot in-place recycling asphalt mixture and a construction method, and relates to the technical field of asphalt mixtures, and the hot in-place recycling asphalt mixture is obtained by recycling old asphalt pavement materials in a high proportion, reducing new material consumption and carbon emission, realizing resource recycling and green construction and introducing a regenerant to recover the performance of aged asphalt. The high-temperature rut resistance, the low-temperature crack resistance, the fatigue resistance and the interface bonding strength of the mixture are synergistically improved by matching with the styrene butadiene rubber modifier, the basalt fiber, the nano silicon dioxide and other functional materials, and the mixture is ensured to be uniform and free of segregation through precise feeding sequence, high-pressure atomization spraying and forced stirring parameter control. The defects of gray materials, oil balls and the like are avoided, the compactness, the flatness and the overall structure stability of the regenerated pavement are improved, and the problems of performance degradation and insufficient durability of a traditional regenerated mixture are solved.

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.

Disclosed in the present invention are a water-reactive asphalt cold patch, a preparation method therefor and a use method thereof. The water-reactive asphalt cold patch of the present invention comprises the following components in parts by mass: 1000 parts of aggregates; 50-60 parts of mineral powder, 85-150 parts of emulsified asphalt, 15-30 parts of a demulsifier, and 1-10 parts of a super absorbent resin. The preparation method for the water-reactive asphalt cold patch of the present invention comprises the following steps: 1) adding aggregates to a mixing vessel and mixing uniformly; 2) adding emulsified asphalt to the mixing vessel and mixing uniformly; 3) adding mineral powder and a demulsifier to the mixing vessel and mixing uniformly; and 4) adding a super absorbent resin to the mixing vessel and mixing uniformly. The water-reactive asphalt cold patch of the present invention has the advantages of simple storage, convenient construction, rapid early strength development, good adhesion to the original pavement, strong resistance to water damage, and eco-friendliness, and is suitable for large-scale popularization and application.

The invention relates to the technical field of asphalt mixtures, and particularly discloses an asphalt regenerant and a preparation method thereof. The asphalt regenerant comprises the following raw materials in parts by weight: 40-60 parts of base oil, 10-15 parts of a styrene-butadiene-styrene block copolymer, 10-15 parts of microwave activated rubber powder, 5-8 parts of an antioxidant, 10-20 parts of a penetration enhancer and 3-8 parts of a stabilizer, the base oil is at least one of bio-oil and vegetable oil; the bio-oil and the vegetable oil are used for improving the flowability of the regenerant, the regenerant can better permeate into a microporous structure of aged asphalt, and the styrene-butadiene-styrene block copolymer and the microwave activated rubber powder are combined, so that the viscoelasticity and the deformation resistance of the asphalt can be improved; the recovery capability of the regenerant on asphalt with different aging degrees is improved.

The invention belongs to the technical field of asphalt recovery and separation, and particularly relates to asphalt reclaimed material multi-stage separation equipment and a separation method.The asphalt reclaimed material multi-stage separation equipment comprises a machine body, a feeding port is formed in the upper surface of the machine body, a crushing roller is rotationally arranged in the feeding port, and a first discharging port is formed in one side of the machine body; a first sieve plate is fixedly connected to the position, corresponding to the first discharging opening, in the machine body; a multi-stage screening assembly is arranged in the machine body and comprises a second screening plate, a second discharging opening is formed in the position, corresponding to the second screening plate, of the machine body, a third screening plate is arranged below the second screening plate, and the third screening plate is fixedly connected into the machine body. Large asphalt and stones often fall down together with a lot of small asphalt stones, so that the problem that the small asphalt blocks do not pass through sieve pores is solved.

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 belongs to the technical field of asphalt mixtures, and relates to a high-dosage RAP low-temperature hot mix plant recycled SMA-13 asphalt mixture and a preparation process thereof, and the low-temperature hot mix plant recycled SMA-13 asphalt mixture comprises the following components by weight: 50-60 parts of an asphalt mixture reclaimed material; 30-40 parts of modified steel slag aggregate; 3-5 parts of SBS modified asphalt; 0.02 to 0.06 part of a low-temperature asphalt modifier; 3-8 parts of superfine slag powder; 0.2 to 0.5 part of lignin fiber; and 1-2 parts of a self-made asphalt regenerant. The limitation of the traditional RAP doping amount is broken through, the highest doping amount reaches 70%, the steel slag recycled aggregate replaces natural aggregate, the consumption of raw materials and the emission of waste are remarkably reduced, and the steel slag recycled aggregate meets the target requirements of the new era of dual-carbon strategy and sustainable development; and the method is particularly suitable for winter construction, heavy traffic roads and green road construction in iron and steel industry areas, and has technical advancement and engineering practicability.

The invention provides a high-temperature-resistant magnesia-carbon composite refractory brick and a preparation method thereof, and belongs to the technical field of magnesium oxide refractory wall bricks, the refractory brick comprises the following raw materials: double-layer modified magnesium oxide, modified crystalline flake graphite, zircon powder, modified liquid phenolic resin and a benzoxazine cross-linking agent; the double-layer modified magnesium oxide is obtained by firstly coating magnesium oxide with powder phenolic resin, aluminum oxide and zirconium oxide and then coating magnesium oxide with asphalt, micron magnesium oxide, zirconium oxide and calcium oxide; the modified crystalline flake graphite is obtained by coating crystalline flake graphite with strontium hydroxide, asphalt and boron carbide; the modified liquid phenolic resin is formed by mixing liquid phenolic resin with a silane coupling agent and a polyacrylate cross-linked polymer. Double-layer modified magnesium oxide, modified crystalline flake graphite and modified liquid phenolic resin are prepared by adopting special components and a method and are matched with zircon powder and a benzoxazine cross-linking agent for use, and a reasonable forming and sintering process is designed, so that the refractory brick has good high-temperature stability, oxidation resistance, thermal shock resistance and the like.

The invention relates to the technical field of asphalt modifiers, and particularly discloses an asphalt regenerant as well as a preparation method and application thereof. The asphalt modifier comprises an oil phase, a polymer phase, a nano reinforced phase and a functional additive phase, wherein the oil phase comprises petrochemical oil and vegetable oil; the polymer phase comprises four-arm radiation star-shaped SBS and a rubber powder lysis solution; the nano reinforced phase comprises silane coupling agent modified nano montmorillonite and graphene; the functional additive phase comprises maleic anhydride grafted polyethylene and sucrose ester. The asphalt regenerant provided by the invention is suitable for various types of aged asphalt, in particular to aged polymer modified asphalt, each failure phase of the aged polymer modified asphalt is accurately repaired through a multi-phase synergistic mechanism, full-dimension regeneration of the aged polymer modified asphalt from a molecular scale to macroscopic performance is realized, and the asphalt regenerant has a wide application prospect. Excellent applicability and reliability are shown in regeneration of various types of aged asphalt, and a powerful guarantee is provided for high-quality implementation of road engineering.

The invention discloses an asphalt material healing and cracking performance detection method and system based on dynamic surface energy parameters, and particularly relates to the technical field of asphalt material detection. The method comprises the following steps: acquiring a surface energy parameter change curve and an initial surface energy parameter of an asphalt material under the action of different environmental conditions, and calculating in combination with an interface energy change rate in a time step to obtain a dynamic healing ability index and a cracking sensitivity index; in addition, finite element simulation is combined with environment load interaction analysis, the healing and cracking critical value of the material is calculated, and durability prediction parameters are further determined; on the basis, calculating a dynamic healing rate and a crack growth rate, and comparing the dynamic healing rate and the crack growth rate with actually measured cracking conditions under different working conditions so as to optimize a surface energy evolution model; the method can accurately evaluate the healing and cracking behaviors of the asphalt material in a complex environment, optimizes the material formula, improves the durability and service life of a road structure, and provides a scientific basis for engineering application.

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 relates to a regenerated rubber and plastic asphalt composite modifier based on shear force-temperature-interface modification as well as a preparation method and application thereof. The regenerated rubber and plastic asphalt composite modifier comprises 65-75 parts of tire rubber powder, 17-25 parts of polyethylene, 8-12 parts of aromatic oil and 0-2 parts of a silane coupling agent (not 0). All the raw materials are mixed and then added into a double-screw extruder, gradient temperature control is conducted through a feeding area, a plasticizing area and a homogenizing area, and finally granulation is conducted to obtain the regenerated rubber and plastic asphalt composite modifier. Compared with the prior art, the invention creatively utilizes the effects of double-screw shear force, high temperature, interface activation of the silane coupling agent, physical melting recombination and chemical interface activation, efficiently improves the integration and activation efficiency and effect of the tire rubber powder and polyethylene, and greatly improves the performance of the modified asphalt.

The invention relates to the technical field of asphalt performance analysis, in particular to a method for detecting and analyzing physical properties of polymer modified asphalt. According to the invention, the collected asphalt sample is subjected to pretreatment means of vacuum degassing, multi-angle image bubble monitoring and constant-speed stirring, the uniformity of the asphalt sample is judged according to physical state parameters at different positions, the reliability of subsequent detection data is further improved, and a plurality of uniformly-divided target asphalt samples are respectively placed in the constant-temperature containers; the method comprises the following steps: recording the heat conduction temperature of each target asphalt sample at different monitoring points in a constant-temperature water bath in real time, carrying out penetration detection on each target asphalt sample after the sample reaches heat balance, carrying out penetration index analysis according to the incidence relation between the temperature and the penetration, and evaluating the physical properties of the polymer modified asphalt based on the penetration index. The penetration data under different temperature gradients can be accurately obtained, the physical properties of the polymer modified asphalt can be comprehensively and accurately evaluated, and a reliable basis is provided for engineering quality control.

The invention discloses a rubber modified asphalt product and a preparation method thereof. The rubber modified asphalt product comprises the following raw materials in parts by weight: 55-60 parts of base asphalt, 15-20 parts of rubber particles, 12-14 parts of a hybrid-based modified filler, 8-11 parts of aromatic oil, 5-8 parts of an additive, 2-3 parts of microcrystalline wax, 2-3 parts of a silane coupling agent and 2-4 parts of an antioxidant. According to the rubber modified asphalt product disclosed by the invention, the base asphalt is matched with the rubber particles, the aromatic oil, the microcrystalline wax, the silane coupling agent and the antioxidant to serve as functional aids, and meanwhile, the hybrid-based modified filler and the additive are added to serve as synergists, so that the base asphalt and the additive are coordinated to achieve a synergistic effect and jointly achieve a synergistic effect; the obtained modified asphalt product has harmonious improvement on elastic recovery, track dynamic stability and bending strain, and also has remarkable water resistance, ultraviolet resistance and cold and heat resistance stability effects.

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 provides a preparation method and application of a petroleum asphalt-based porous carbon material, and belongs to the technical field of porous carbon materials. The preparation method comprises the following steps: by taking petroleum asphalt as a carbon precursor, stirring and pre-oxidizing the petroleum asphalt and molten salt at a certain temperature, then pre-carbonizing, washing away the molten salt, and carbonizing with KOH to prepare the petroleum asphalt-based porous carbon material. The petroleum asphalt with low carbon yield (11%) is converted into the petroleum asphalt-based porous carbon material with obviously improved carbon yield (up to 30%) through an efficient and convenient method. When the petroleum asphalt-based porous carbon material prepared by the method provided by the invention is used as an electrode material of a lithium ion battery / zinc ion capacitor, the petroleum asphalt-based porous carbon material shows excellent electrochemical performance.

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 high-viscosity and high-elasticity modified asphalt and a preparation method thereof, and belongs to the technical field of highway engineering. The high-viscosity and high-elasticity modified asphalt is prepared from the following raw materials in parts by weight: 100 parts of matrix asphalt, 4 to 5 parts of styrene-butadiene-styrene block copolymer, 1 to 2 parts of polypropylene particles, 1 to 2 parts of TMC modifier, 1.5 to 3 parts of compatilizer, 0.5 to 1.5 parts of amide wax, 0.3 to 0.5 part of nano montmorillonite, 0.5 to 1 part of flexibilizer and 0.1 to 0.2 part of stabilizer, wherein the TMC modifier is a mixture formed by mixing simethicone, amino silicon oil, lauryl phosphate and castor oil polyoxyethylene ether according to the mass ratio of 5: 3: 1: 1. The high-viscosity and high-elasticity modified asphalt provided by the invention is high in softening point, good in viscosity and elasticity recovery capability at 60 DEG C, good in water resistance, aging resistance, weather resistance and high-temperature stability, and small in kinematic viscosity at 170 DEG C. The high-viscosity and high-elasticity modified asphalt provided by the invention is good in construction workability, and is beneficial to prolonging the service life of an asphalt pavement.

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.

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

The invention discloses a preparation method and application of a full-particle-size steel slag gradient carbonized artificial aggregate suitable for an asphalt ultrathin wearing layer, relates to a preparation method and application of an artificial aggregate, and aims to solve the technical problems that the strength of the existing carbonized steel slag aggregate is low, and multi-element solid waste resources cannot be comprehensively utilized. The method comprises the following steps: carrying out crushing, magnetic separation and screening on steel slag to obtain particles with different particle size grades; and sequentially carrying out pre-curing, granulation curing, pre-curing and post-curing treatment on each grade of particles to obtain the full-particle-size steel slag gradient carbonization artificial aggregate. The average carbon fixation amount of the aggregate is 12.4%, the average free calcium oxide content is 0.32%, the average compressive strength is 54.32 MPa, and the volume expansion rate is 0.32% when the aggregate is kept at the temperature of 60 DEG C for 5 days. When the aggregate is used for preparing an ultrathin wearing layer SMA-10 type asphalt mixture, the dynamic stability is 13285 times / mm, the immersion Marshall is 96.5%, and the anti-skid BPN value is 0.76. The method can be used in highway fields.

The invention relates to the field of road building materials, and particularly discloses recycled asphalt concrete and a preparation method thereof, and the recycled asphalt concrete comprises the following raw materials: a waste asphalt mixture, matrix asphalt, aggregate, mineral powder, hydroxyl modified polyester fibers, a polymer composite modifier, modified nano silicon dioxide and a regenerant; the preparation method comprises the following steps: preheating the waste asphalt mixture; mixing and preheating the aggregate and the mineral powder; preheating matrix asphalt and mixing the matrix asphalt with the preheated aggregate to prepare a primary mixture; preheating a regenerant, mixing with the primary mixture, and then mixing and stirring with the preheated waste asphalt mixture to obtain a mixture; mixing the hydroxyl modified polyester fiber, the polymer composite modifier and the modified nano silicon dioxide, and then stirring and mixing with the mixture to prepare the recycled asphalt concrete. The method has the characteristics that the later cracking problem of the recycled asphalt concrete is relieved, and the durability of the recycled asphalt concrete is improved.

The invention relates to a high-utilization-rate RAP asphalt regenerant and a preparation method thereof. The regenerant comprises the following components in percentage by mass: 30%-50% of a petroleum-based softener, 10%-20% of biomass oil, 5%-15% of a polymer modifier, 1%-5% of a surfactant, 0.5%-2% of an antioxidant and 2%-10% of a functional additive. All the components have a synergistic effect, so that the asphalt modifier can effectively permeate aged asphalt, supplement light oil, reduce viscosity, recover flexibility and remarkably improve high-temperature rut resistance and low-temperature crack resistance of regenerated asphalt. By reasonably selecting the raw materials and proportioning, the production cost is reduced, the RAP utilization rate is improved, and the environment-friendly raw materials are adopted, so that the requirements of environmental regulations are met. The result of the embodiment shows that after the regenerant is added, the performance recovery of the aged asphalt is good, the viscosity of the regenerated asphalt mixture is moderate, the needle penetration recovery rate is high, the softening point is high, the ductility is large, the comprehensive performance is excellent, and the regenerant is superior to commercially available products.

The invention provides a plant fiber asphalt mixed material as well as a preparation method and application thereof, and belongs to the technical field of composite asphalt. Performance optimization is achieved through a specific fiber-reinforced asphalt mixture scheme, the asphalt mixture comprises pretreated natural plant fibers, asphalt, coarse materials, fine materials and mineral powder, after mixing, the high-temperature stability, the water damage performance and the fatigue performance of the asphalt can be remarkably improved, the balance of cost and performance is achieved, and the service life of the asphalt is prolonged. And the defect that the cost of the conventional high-performance pavement material is often too high is overcome. The problems of high-temperature stability, water damage performance, fatigue performance, cost and performance balance and the like of a traditional asphalt pavement material are effectively solved, and the comprehensive performance of the pavement material is remarkably improved.

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 high polymer material and polymer modification, in particular to modified asphalt based on nano material reinforcement and a preparation method, the modified asphalt comprises matrix asphalt subjected to molecular cutting and compounding, a nano titanium dioxide-graphene-carbon nano tube ternary composite material, zwitter-ion and silane synergistically modified nano montmorillonite, the rubber powder subjected to special treatment, the bio-based and traditional compound plasticizer and the 2-mercaptobenzimidazole and sulfur compound stabilizer are synergistically modified. The modified asphalt has the advantages of excellent performance, high-temperature stability, low-temperature crack resistance, strong aging resistance, efficient and environment-friendly preparation process, low energy consumption, short period and good nanometer material dispersion, and adopts the bio-based plasticizer to promote the green development of the asphalt industry.

The utility model relates to the technical field of asphalt production, and discloses a reaction kettle for asphalt production, which comprises a tank body, a stirring device is arranged in the tank body, and the stirring device comprises a stirring part; the stirring part comprises a stirring plate, a motor, a square rod and a mounting cylinder, the bottom surface of the motor is fixedly connected with the top surface of the tank body, and the mounting cylinder is slidably arranged on the outer surface of the square rod in a sleeving manner. According to the reaction kettle for asphalt production, a hydraulic rod, a connecting plate, a first connecting rod, a sliding block, a sliding rail, a sleeve and a second connecting rod are arranged, the hydraulic rod is controlled to extend, the sliding rail is pushed to move downwards, through the sleeve, the first connecting rod and the second connecting rod, a mounting barrel moves upwards, a stirring plate moves upwards, and asphalt on the upper layer is stirred; meanwhile, when the horizontal plate moves upwards, the asphalt on the bottom layer is pushed upwards, and when the horizontal plate moves downwards, the asphalt on the upper layer moves downwards, so that the asphalt on the upper layer and the asphalt on the lower layer are promoted to be mixed.

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 relates to a porous carbon material as well as a preparation method and application thereof. The specific surface area of the porous carbon material is 1500-3000m < 2 > / g, and pore channels are intensively distributed in a range of 0.6-2.0 nm. The preparation method of the porous carbon material comprises the following steps: (1) montmorillonite acid treatment; (2) uniformly mixing the acid-treated montmorillonite obtained in the step (1) with asphalt, and carrying out carbonization treatment to obtain a carbonized material; and (3) under the inert atmosphere condition, mixing the carbonized material with an activating agent for activation, and then washing and drying. The porous carbon material obtained by the invention has the advantages of large specific surface area, reasonable pore size distribution, high ion transmission speed and the like, and is a super-capacitor carbon material with excellent rate capability.

The invention provides a coal seam sandstone roof water retention coal mining method with control while mining based on mining-induced fracture grouting. The coal seam sandstone roof water retention coal mining method comprises the steps that hydrogeological parameters of a target working face of a coal mine are obtained; according to the hydrogeological parameters, determining a roof fracture step pitch of the target working face, determining stratum distribution characteristics above the target working face, and determining simulated development characteristics of a flowing water fractured zone of the target working face; determining a grouting horizon according to the simulated development characteristics of the water-flowing fractured zone and the formation distribution characteristics; the target working face is subjected to stoping, and after the stoping distance reaches the roof fracture step pitch every time and the roof of the target working face is fractured, layered grouting is conducted on the grouting layer position corresponding to the target working face in the roof fracture step pitch till stoping of the target working face is completed completely. And after layered grouting of all the grouting layers corresponding to the target working face is completed, operation is finished. The coal seam sandstone roof water retention coal mining method with control while mining based on mining-induced fracture grouting is high in safety and water control mining efficiency, and resources are saved.