40 results about "Rut" patented technology

A pitch road rubber composite anti-rutting agent is prepared from polyethylene of 50-80 accounts, rubber powder of 5-20 accounts, construction pitch of 2-10 accounts and polyethylene color masterbatch of 0.2-1 accounts, wherein the rubber powder is waste rubber powder. The preparation method comprises mixing materials, mixing, heating, mixing milling, extruding and cutting or grinding. The prepared pitch road rubber composite anti-rutting agent added into pitch mixture has dynamic stability, break stress, residue stability and residue strength ratio of JTG F40-2004 road pitch construction technique standard published by Ministry of Communication. The invention has low cost, energy saving, environment protection, easy operation and the application for pitch road anti-rutting agent.

The invention provides a method for paving an anti-rut anti-skid pavement coating. The method for paving the anti-rut anti-skid pavement coating comprises the following steps of construction preparation, earlier-stage processing, primer preparation, primer coating, aggregate spreading and recycling, finishing coat preparation and coating, maintenance, and final cleanup. Primarily, the surface layer of pitch is evenly coated with acrylic resin, high-abrasion-proof-value aggregate is paved on the surface of the acrylic resin, the aggregate and the primer are well combined, a nanofiller in the primer or the finishing coat enables the coating to be strong in heat refection capacity, the surface temperature of the coating is lowered by 5-12 DEG C in the high-temperature weather, therefore, the pavement temperature is lower than the pitch softening point, and the problem of the pavement rut is effectively solved. The friction coefficient of the coating is higher than that of an ordinary pitch pavement, good in skid resistance, and capable of improving the abrasive resistance of a pavement and enabling the color of the pavement to keep attractively bright-colored for a long time.

The invention provides a noise-reducing and rut-resisting agent and a production method thereof. The agent comprises rock asphalt, polymer and diatomite and is characterized by also comprising rubber powder. The weight portions of rock asphalt, polymer, diatomite and rubber powder are respectively 5 to 15, 15 to 33, 20 to 30 and 60 to 74. Rock asphalt, polymer and diatomite are ground, added with rubber power and then placed into a mixer according to the above weight portions; then the mixture is extruded into strips by a screw extruder, then cut into granules after cooling and finally dried. The invention has the advantages of obviously reducing the tire noise caused by road driving, and having safe and simple usage, uniform dispersion, high-temperature rut resistance, low-temperature crack resistance, low cost and relatively high performance price ratio.

The invention discloses an Anti-rut modifier and a preparation method thereof. The modifier comprises the following components by mass: 70%-94% of sulphur, 2%-10% of EVA, 3%-10% of waste rubber powder, and 1%-10% of uintaite. The preparation method comprises the following steps: well mixing sulphur, ethane-vinyl acetate copolymer, waste rubber powder and uintaite, delivering the mixture into an extruder, performing extrusion and granulation to obtain the modifier of the invention. The modifier of the invention has small pungent smell in the preparation process; when the modifier of the invention is added into an asphalt mixture, the anti-rut performance of asphalt pavement is effectively improved, and the modifier has good compatibility with asphalt.

The invention provides an evaluation method for the bonding strength of a drainage asphalt mixture joint. The evaluation method comprises the following steps: forming a platy rut sample, and cutting the rut sample into two half block test pieces with equal area; smearing a to-be-evaluated joint material on a cutting joint, and curing; molding the cured half-piece rut test piece and the other half-piece test piece on which the joint material is not smeared to obtain a complete platy rut test piece; cutting a joist, dividing joist test pieces into two groups, and separately carrying out a nonmetal tensile test and a bending test on the joist test pieces. According to the evaluation method provided by the invention, a universal testing machine is adopted, and the cutting size of the test piece is below 20cm, so that the operation in a room is facilitated; the evaluation method is an indoor test method with high feasibility; the evaluation result gives out valuable guidance for selection of the joint material and site joint construction.

The invention belongs to the technical field of road maintenance and particularly relates to a heavy load resistant anti-rut agent and a preparation method thereof. The preparation method disclosed by the invention comprises the following steps: washing rice husks, and heating and filtering with a sodium hydroxide solution so as to obtain a filter cake; washing, drying, maintaining the temperature and carbonizing so as to obtain the carbonized rice husk; sintering with sodium fluoride and nano iron powder and performing oxidation treatment; collecting calcined particles, mixing and standing with a hydrofluoric acid solution; filtering, and drying to obtain modified particles; mixing sodium hydroxide with a magnesium sulfate solution, and dispersing with the modified particles so as to obtain precursor slurry, carrying out a high-pressure reaction, and filtering to obtain filter residues; washing, drying, performing mixed extrusion granulation with natural rock asphalt, polyvinyl butyral, polycarbonate and the like; finally, cooling, so as to obtain the heavy load resistant anti-rut agent. According to the heavy load resistant anti-rut agent disclosed by the invention, the rut resistance of a concrete pavement under heavy load and high temperature conditions can be effectively improved, and the rut resistance is improved, therefore, the pavement rut diseases are effectively reduced.

The present invention is a lure optimized for a particular animal such as deer. The optimized lure is made using urine from only two animals urinating at approximately the same time. The animals can be either male or female, but preferably, females in estrus are used for optimal results. This mixture of urine is not diluted in any manner with that of additional animals or preservatives. The urine for the lure is obtained by using a single stall exclusively for only two animals for the purpose of gathering urine. This technique has been especially effective in attracting wandering bucks in rut.

The invention discloses a high-strength soil-fixing rock powdery material, a preparation method and application thereof. The components of the raw materials are blended through a specific material preparation method, the soil fixation rock material with different raw material ratios is prepared according to different soil texture types and different characteristics, the soil fixation rock material is self-hardened and coagulated at normal temperature and normal pressure and is subjected to isomorphic reaction with soil particle minerals on an interface, a space network staggered structure is formed in the solidified body, so that the material has high strength, high water stability and anti-permeability and anti-freezing performance. Through application of the high-strength soil fixation rock powdery material, tracking observation is carried out on the strength of a road section, and it is observed that the appearance of the road surface of the road section is smooth and free of subsidence, ruts, longitudinal and transverse cracks and reflection cracks.

The invention discloses anti-rutting anti-fatigue high-modulus composite modified asphalt which is prepared from the following raw materials: matrix asphalt, a styrene-butadiene-styrene triblock copolymer, an auxiliary agent, composite natural rock asphalt and a stabilizer. The modified asphalt produced by the invention has the advantages of high-temperature rut resistance, durability, aging resistance, water damage resistance and the like, and has relatively strong rut resistance and elastic deformation capacity, and the low-temperature performance of the modified asphalt is not influenced while the high-temperature stability of the asphalt is remarkably improved. Through the optimal proportion and interaction of multiple components, the modulus, high and low temperature performance and fatigue resistance of the modified asphalt are effectively improved, and the modified asphalt is suitable for being used in the fields of heavy traffic roads, airport pavements and the like. The preparation method is simple and easy to implement and low in preparation cost.

The invention belongs to the field of road engineering and discloses a rutting plate forming device with a shear resistance testing function. The device comprises a rolling and loading component, a forming and heating component, a supporting and demolding component, a movable driving component, a driving supporting motor, a shearing component and a control component. According to the device, single-layer and double-layer rutting plate forming and shear resistance tests are realized, the internal temperature and the interlayer stress state of the asphalt pavement under actual working conditionsare simulated, the problems that an asphalt mixture rutting plate test piece is complex in forming and inconvenient to demold, stress and temperature of the test piece are inconsistent with reality and the like are solved, the forming efficiency of the test piece is improved, the test error of a traditional shear test is reduced, and the development prospect is wide.

The invention discloses an improved asphalt mixture rut experimental device and experimental method. The method specifically comprises the following steps of 1, preparation work before test: drawing up a test scheme, debugging a rut tester and preparing a test piece, 2, setting a test environment: setting the design temperature of the asphalt mixture and the actual temperature of a rut test, 3, starting a test: performing heat preservation on the test piece: starting the test: fixing the test piece and the test mold on a test bed of a rut tester together, enabling a test wheel to walk in the center of the test piece, enabling the walking direction of the test wheel to be consistent with the rolling direction of the test piece, and starting the rut tester, and 4, calculating test data. According to the improved asphalt mixture rut experimental method, the generation process of asphalt pavement ruts can be simulated more truly, the adaptability of the rut experiment to the modified asphalt mixture is enhanced, and more reasonable reference is provided for asphalt mixture design and high-temperature performance evaluation.

The invention discloses a soaking rut test accessory device. The soaking rut test accessory device comprises a base, handles and fixing clamping positions all made of metal materials. The handles comprise the first handle and the second handle which are symmetrically connected to the two sides of the base. The fixing clamping positions comprise the first fixing clamping position, the second fixingclamping position, the third fixing clamping position and the fourth fixing clamping position, are connected to the bottom of the base in a rectangular distribution mode and form a whole with the base and the handles, and the effect of fixing the rut plate mold is achieved. The invention also provides a corresponding test method. The device is simple in structure and convenient to operate, can measure the high-temperature rut resistance and the water damage resistance of the asphalt mixture under unconventional test conditions (water and even saline environments), and is used for testing thehigh-temperature stability and the water damage resistance of the asphalt mixture during mix proportion design; therefore, a traditional rut tester can finish quantitative evaluation of the performance of the asphalt mixture under the water immersion condition.

The invention discloses a macadam seal oil flooding degree testing method. The method comprises steps of: preparing a macadam seal sample formed by an asphalt patch, the width of the macadam seal sample being the same as the width of a tire of the rut experimental device, the thickness of the asphalt patch linearly changing along the length direction of the macadam seal sample, and different thicknesses corresponding to different asphalt contents; covering the surface of the macadam seal sample with a light-colored composite fabric, and then carrying out a track test; collecting a lower surface image of the composite fabric after the rut test is finished; calculating the black area proportions of a plurality of regions which are in contact with the broken stone seal sample and are equallydivided along the length direction of the broken stone seal sample; and characterizing the oil flooding degree of the macadam seal under the average asphalt content corresponding to the correspondingregion by using the black area ratio, thereby obtaining a plurality of quantitative indexes of the oil flooding degree of the macadam seal under different asphalt contents. The invention further discloses an asphalt consumption determining method. Compared with the prior art, the method is simple, feasible and more accurate.

The invention discloses a maintenance device for automatically detecting and repairing ruts on an asphalt pavement. The maintenance device comprises a radar measurement system, a data processing and control system, a microwave heating system, a pavement surface raking system and an asphalt storage and spreading system, according to the maintenance device, whether the rut exists on the pavement is automatically detected, the depth and width of the rut can be measured, the spreading position and dosage of the asphalt mixture can be obtained, each rut can be intelligently, accurately and efficiently repaired, material waste is avoided, and the method can play an important role in road maintenance engineering. Automatic heating and raking of ruts can be achieved, and the working efficiency is improved. Compared with manual maintenance, the maintenance device is used for automatic operation, and potential safety hazards are reduced.

The invention discloses an asphalt mixture rutting test device, comprising: a box body; a support platform arranged in the box body, a fixed shaft is arranged on the support platform, and a rotating plate is rotatably connected to the fixed shaft. The rotating plate includes a test template, a connecting plate and a transmission plate connected in sequence from left to right; the motor is arranged in the box and is located below the transmission plate, and the motor drives the transmission plate to swing back and forth The pressure rod is hinged on a short side wall of the box body, a connecting rod is arranged downward in the middle of the pressure rod, the end of the connecting rod is connected with a roller, and the end of the pressure rod is provided with a counterweight so that the rollers are pressed against the surface of the asphalt mixture test form on the test form. The invention can simulate the actual driving condition on the asphalt mixture test mold of the turning or U-turn road section through the reciprocating swing of the asphalt mixture test mold, and can more accurately provide the rutting test data of the asphalt mixture of the turning or U-turn road section.

The low temperature cracking and high temperature rutting of polymer-modified asphalt concrete pavement can be reduced. The composite includes asphalt and at least one polymer that expands at low temperature, triggered by cooling-induced tensile stress, to reduce thermal cracking. The composite includes at least one polymer that expands at high temperature, so that the composite recovers after compression induced by traffic loading at higher temperatures, thereby reducing rutting. The system reduces thermal stress, and reduces or even eliminates thermal cracking and rutting. Shape memory polymers (SMPs) are used to improve asphalt compositions so that they better resist both thermal cracking and rutting. The SMP(s) can be incorporated into the asphalt, or a portion of fine aggregates can be replaced with SMP particles or SMP fibers, or aggregate replacement and asphalt modification can be combined.

The invention discloses an asphalt mixture three-dimensional void connectivity characterization and evaluation method. The method comprises the following steps: preparing an asphalt mixture rut plate test piece, cutting a drill core, and carrying out CT (Computed Tomography) on a core sample; carrying out superposition reconstruction and morphological processing on a projection image obtained by scanning, and carrying out threshold segmentation to identify voids of the core sample, asphalt mortar and aggregate; calculating the void ratio of the reconstruction model, comparing the void ratio with the real void ratio of the sample, and extracting a void ball-stick system of the sample by using a maximum sphere algorithm to carry out visual representation on the three-dimensional distribution of voids; calculating the coordination number of the void ball-stick model and the equivalent length of a throat formed by void communication so as to evaluate the void communication degree; and performing CT scanning on the core sample subjected to wheel rolling again, and reflecting the stability of the void structure of the mixture by virtue of a communication parameter change rate before and after scanning. The method provides a novel way for representing the void connectivity of the mixture on a three-dimensional scale level, and is beneficial to comprehensively understanding the spatial distribution characteristics of the voids of the asphalt mixture.

The invention discloses an asphalt mixture asphalt-aggregate ratio determination method based on performance requirements, which comprises the following steps: 1, performing sample preparation on an asphalt mixture to obtain a load sample and a rut sample; 2, respectively carrying out a load test and a rut test on the load sample and the rut sample to obtain load test times and dynamic stability; 3, inputting the load test times and the dynamic stability into an expert system for response surface analysis to obtain a two-dimensional performance profile diagram and a three-dimensional performance response diagram; and 4, compounding the two-dimensional performance profile diagrams to obtain a performance superposition diagram. A plurality of load samples and a plurality of rut samples are subjected to load tests and rut tests respectively, then two-dimensional performance profile diagrams and three-dimensional performance response diagrams are obtained through response surface analysis, then the two-dimensional performance profile diagrams are compounded to obtain a performance superposition diagram, and only one group of materials needs to be designed, so that the performance superposition diagram is obtained. The optimal asphalt-aggregate ratio of the asphalt mixture under the condition of performance requirements can be obtained, and the test efficiency is improved.

The invention discloses an asphalt mixture wheel tracking test device. The asphalt mixture wheel tracking test device comprises a main body with a sealed structure and a temperature control structure for providing temperature control in the main body, wherein the main body is internally provided with a main shaft and a motor for enabling the main shaft to rotate; the main shaft is uniformly connected with a plurality of hydraulic connecting rods; the end parts of the hydraulic connecting rods are connected with rubber rolling wheels; a fixing device for fixing a test piece is arranged just below the main shaft; the main body is further internally provided with a frequency conversion and speed regulating box for controlling the movement frequency of the motor. According to the device disclosed by the invention, the design of a counterweight block is omitted so that a series of problems caused by the counterweight block are solved; the temperature adjustment can be carried out so that tests under different temperature are realized.

The invention discloses a modified asphalt mixture resistant to high temperature wet-dry method and its preparation method and application, aiming to provide a modified asphalt mixture preparation with good performance, economy, mechanized construction, high temperature and water damage resistance, and rutting resistance Construction method. The modified asphalt mixture resistant to high temperature wet-dry method includes the following materials in weight percentage: 95.921%~94.671% of stone materials of various specifications; 3.8%~4.5% of base asphalt; 0.12%~0.185% of SBS; 0.015%~0.090% of rubber oil; Agent 0.02% ~ 0.014%; rock asphalt + diatomaceous earth 0.133% ~ 0.540%. The paved asphalt concrete pavement paved by the invention is resistant to high temperature rutting and water damage, can prevent early damage, reduce repair and maintenance costs, and prolong the service life of the road.

The invention relates to a rut sample forming machine which comprises a workbench. One side of the workbench is provided with a mounting frame and a first driving part used for driving the mounting frame to slide, the mounting frame is provided with a mounting block and a second driving part used for driving the mounting block to slide, and the mounting block is rotatably provided with a rolling wheel. A rectangular placement groove is formed in the middle position of the workbench, and a test mold is detachably arranged in the placement groove. The two sides of the placement groove are each provided with a discharging groove, and the sides, close to the placement groove, of the discharging grooves are connected with the placement groove. During an experiment, the test mold is placed in the mounting groove, the mounting frame is moved to the position above the test mold, then the mounting block is driven to drive the rolling wheel to move downwards, pressure is applied to an asphalt material in the test mold, the asphalt material is rolled, and when the asphalt material in the test mold overflows outwards, the asphalt material enters the discharging grooves in the two sides, a situation that overflowing asphalt materials make contact with the rolling wheel to affect movement of the rolling wheel is effectively avoided, and the experiment accuracy is improved.

The invention discloses a high-modulus recycled asphalt mixture mix proportion design method, which uses an old road milling material as a recycled material and SBS composite modified rock asphalt as a binder, utilizes the old road milling material, relieves the problem of low recycling rate of construction waste, and reduces the construction cost. The dynamic modulus is used as one of optimal asphalt-aggregate ratio determination factors, the modulus of the mixture is improved, and the problem that rut damage is prone to being generated in a middle surface layer is solved, and a reasonable interval is provided for determining the mixing amount of the plant-mixed hot recycled mixture RAP. The dynamic modulus of the asphalt mixture with three milling material mixing amounts are tested in a stress control loading mode. A continuous half-sine wave compression load is applied under the temperature condition of 20 DEG C, and the loading frequency is 10Hz; wherein each asphalt mixture is subjected to three groups of parallel tests, and the results are averaged. When the dynamic modulus of the asphalt mixture is tested, according to the sequence of the temperature from low to high and the frequency from large to small, the damage to the sample and the test error are reduced.

The invention discloses an anti-rutting modifier and a preparation method thereof. The modifier comprises: 70% to 94% of sulfur, 2% to 10% of EVA, 3% to 10% of waste rubber powder and hard asphalt in terms of mass percentage 1% to 10%. The preparation method includes the following steps: uniformly mixing sulfur, ethylene-vinyl acetate copolymer, waste rubber powder and hard asphalt, conveying the mixture to an extruder for extrusion and granulation to obtain the modifier of the present invention. The modifying agent of the present invention has little pungent odor during the preparation process, and the modifying agent of the present invention is added into the asphalt mixture, which can effectively improve the anti-rutting performance of the asphalt pavement, and has good compatibility with asphalt.

The present invention relates to the technical field of asphalt antiaging agents, in particular to red mud-silicate composite antiaging agents, asphalt mixtures and their preparation methods and applications. In parts by weight, the raw material composition of the antiaging agent includes: red mud 40 ‑70 parts, 10‑30 parts of silicate material, 1‑10 parts of slaked lime, 1‑10 parts of lime mud, 10‑20 parts of aromatic oil. The present invention combines the performance characteristics of red mud and silicate materials to prepare an anti-aging agent compounded with red mud and silicate materials. The anti-aging agent can effectively improve the temperature resistance to rutting and low temperature crack resistance of asphalt mixtures And water stability, and the dynamic modulus has been significantly improved, which can reduce the damage caused by aging of the asphalt pavement during service, prolong the service time of the road, and reduce the cost of road maintenance.

The invention relates to a method for calculating dynamic stability of the modified asphalt mixture. The method comprises steps that (1), data automatically read by rutting software in a rutting testis inputted into original software for nonlinear function fitting to obtain an equation y=f(x); (2), an x0 value of a Lagrangian median point of the fitted nonlinear function curve from 0 min to 60 min is solved, and the t1 is any point in the period from x 0 of the Lagrange median to 45 minutes or an approximate value of the x 0 value of the Lagrangian median point; (3), t2 is selected, and the t2 is any point in the T1 + 15 min to 60 min period; (4), the mixture flow section area deltaS of the rutting curve is calculated based on a formula as described in the specification; and (5), the dynamic stability DS1 is calculated based on a formula as described in the specification. The method is advantaged in that the dynamic stability is calculated through the mixture flow section area of therutting curve, and a problem of large calculation error of the dynamic stability of the modified asphalt mixture is solved in a targeted manner.

The invention relates to a method for evaluating the regeneration efficiency of an asphalt regenerant, in particular to a test method for evaluating the regeneration rate of the regenerant. A certain action time is given to the regenerant, the regenerated asphalt is subjected to a dynamic shear rheological test, and the regeneration rate of the regenerant is effectively represented by a phase angle to guide the mixing time during actual construction. The evaluation test method solves the regeneration effect of the regenerant. According to the method, a certain action time is given to the regenerant, the regenerated asphalt is subjected to a dynamic shear rheological test, the regeneration effects of different regenerant are analyzed by using the compound modulus and the rut factor, and the regenerant with a better regeneration effect and better applicability is helped to be selected.

The invention discloses a high-performance modified asphalt wearing layer rut sample forming device which comprises a bottom box, guide columns are vertically arranged on the two sides of the top of the bottom box, a control box is transversely arranged at the top ends of the guide columns, a hydraulic cylinder is arranged in the middle of the top of the control box, and the output end of the bottom of the hydraulic cylinder penetrates through the control box; compared with the prior art, through matched connection of the bottom shell, the telescopic air cylinder, the vertical rod, the bottom shell, the worm gear, the worm, the rotating plate and the motor, the telescopic air cylinder can drive the bottom shell to move front and back, a forming module is convenient to take, place and install, the motor drives the worm gear and the worm to rotate, the rotating plate can be driven to rotate, and therefore the forming module can be conveniently taken and installed. The track mold is in full contact with the forming mold, the test accuracy of the mold test is improved, the forming mold can be fixed by arranging the clamping plates, and the practicability is high.

Novel asphalt mixture rut test piece demolding equipment is composed of a demolding machine, a lifting column, a lifting table, a demolding plate, a power switch, an ascending button, a stop button, a descending button, an anti-sticking coating, a rut test piece mold side plate, a heat insulation handle, a rut test piece mold side plate bottom plate and fixing bolts which are matched with one another. The rut test piece mold side plate and the rut test piece mold side plate bottom plate can be fixed through fixing bolts, so that an open container is formed, and an anti-sticking coating is arranged on the inner wall of the open container. According to the invention, the demolding process becomes more convenient, the hydraulic device is used for assisting demolding, the defect of demolding by beating with a rubber hammer is overcome, the demolding efficiency is obviously improved, disturbance to a test piece is avoided, and the influence of operation in the demolding process on various properties of the test piece is reduced.