25 results about "Dynamic shear rheometer" patented technology

The invention discloses a heavy traffic asphalt pavement damage evolution prediction system, and relates to the technical field of road engineering, and the system comprises a data acquisition module which is used for obtaining continuous multi-frame time sequence images of pavement cracks, a vehicle-mounted axle load spectrum and environment temperature and humidity data; the image processing and space-time modeling module is used for performing multi-scale fractal processing and dynamic time warping on the time sequence image and calculating a cross-scale fractal dimension sequence; the material performance association module is used for establishing and updating a probability association model of the fractal dimension and the shear modulus in real time according to the test data of the dynamic shear rheometer; the multi-physics field data fusion module is used for performing multi-physics field feature fusion through the fractal attention network to generate a multi-physics field collaborative damage correction factor; and the damage prediction and early warning module is used for predicting a fractal dimension growth trend through a fractal domain adaptive transfer learning algorithm, and outputting damage evolution early warning based on a viscoelasticity phase consistency verification result.

The invention discloses a mixing parameter regulation and control method and system for an SBS-T modified asphalt mixture and a terminal. The method comprises the following steps: analyzing a modification mechanism through a scanning electron microscope and X-ray photoelectron spectroscopy combined technology, dividing three stages of rapid melting and the like, and establishing a temperature-viscosity model; constructing a multi-scale capture system by using an atomic force microscope, a Fourier transform infrared spectrum and a dynamic shear rheometer; designing a five-factor three-level test matrix by adopting a response surface method, and establishing a road performance prediction model in combination with a BP neural network; mixing parameters are optimized in a multi-objective mode based on a genetic algorithm, and dynamic correction is achieved through an Internet of Things sensor and Kalman filtering. The system comprises a mechanism analysis module, a multi-scale detection module, a terminal integrated storage unit, a processing unit and a man-machine interaction unit. According to the scheme, the limitation of traditional single-factor analysis is broken through, microscopic and macroscopic collaborative optimization and dynamic parameter regulation and control are achieved, and the construction adaptability and precision are improved.

The invention relates to the technical field of material testing, in particular to an asphalt aging degree detection method for thermal recycling of an asphalt mixture, which comprises the following steps: acquiring asphalt samples in the same batch, detecting the asphalt samples by using a dynamic shear rheometer at different testing temperatures, acquiring the physical aging performance of the asphalt in the same batch, and determining the aging degree of the asphalt in the asphalt mixture. And obtaining the internal chemical aging performance of the same batch of asphalt by combining the difference between the absorption peak intensity of each functional group in the first functional group and the second functional group of each asphalt sample and the corresponding standard absorption peak intensity, and obtaining the comprehensive aging performance of the same batch of asphalt by fusing the asphalt physical aging performance and the asphalt internal chemical aging performance. Therefore, the problems of incomplete and inaccurate analysis and the like caused by a single method are avoided, the aging characteristics of the asphalt can be deeply analyzed from two aspects of physics and chemistry, and the aging degree of the asphalt can be accurately and comprehensively obtained.

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.

The invention provides a multi-factor coupling asphalt accelerated aging simulation method and system, and relates to the technical field of road engineering. The method comprises the following steps: at the beginning of simulation, performing multi-factor coupling asphalt aging environment simulation through an aging test box; acquiring set parameters of the multi-factor coupling asphalt aging environment simulation; determining an aging stress index according to the set parameters; obtaining the operation time of the aging test box; determining equivalent aging time according to the aging stress index and the operation time; when the simulation is finished, obtaining aging parameters of the asphalt through a dynamic shear rheometer and a penetrometer; determining an aging degree deviation according to the aging parameter; and determining whether to adjust the set parameters according to the aging degree deviation. According to the invention, the aging rate can be dynamically adjusted according to the aging stress index, and the set parameters can be dynamically adjusted according to the aging degree deviation so as to optimize the simulation condition and improve the accuracy and reliability of simulation.

The application provides a multi-factor coupling asphalt accelerated aging simulation method and system, and relates to the technical field of road engineering. The method comprises the following steps: at the beginning of simulation, performing multi-factor coupling asphalt aging environment simulation through an aging test box; obtaining set parameters of the multi-factor coupling asphalt aging environment simulation; determining an aging stress index according to the set parameters; obtaining the running time of the aging test box; determining an equivalent aging time according to the aging stress index and the running time; at the end of simulation, obtaining aging parameters of asphalt through a dynamic shear rheometer and a penetration meter; determining an aging degree deviation according to the aging parameters; and determining whether to adjust the set parameters according to the aging degree deviation. According to the application, the aging rate can be dynamically adjusted according to the aging stress index, and the set parameters can be dynamically adjusted according to the aging degree deviation to optimize the simulation conditions, improve the accuracy and reliability of the simulation.

The present invention discloses a method for identifying the initiation, expansion, and fracture failure of asphalt fatigue cracks. The present invention uses a dynamic shear rheometer to perform a scanning test on an asphalt sample, collects torque T and deflection angle #imgabs0# data, and sequentially obtains the asphalt fatigue crack length a and the energy release rate G during the asphalt fatigue crack growth process. Finally, based on the evolution relationship between the asphalt fatigue crack length a and the number of cyclic loading cycles N, the dividing point between the fatigue crack initiation process and the expansion process is calculated, and the peak point of the energy release rate G is used as the critical point of asphalt fatigue failure. The present invention systematically solves the current problems of dividing asphalt into different fatigue stages under dynamic shear fatigue loads and determining the critical point of fatigue failure, and can finely analyze the fatigue process and behavioral characteristics of asphalt materials.

The invention discloses a portable dynamic shear rheometer based on a lightweight structure, and relates to the technical field of material science rheological property testing equipment. The voltage type inverter driver, the torque collector and the data collector are connected with the computer through the main control circuit; the protective base, the magnetic encoder, the permanent magnet synchronous motor, the strain gauge type torque sensor, the magnetic suspension bearing and the rotor are coaxially assembled from bottom to top; the magnetic encoder and the permanent magnet synchronous motor are directly connected to form a rotating main shaft, the magnetic suspension bearing is installed between the rotor and the strain gauge type torque sensor, the top plate is fixedly installed at the top of the height adjusting mechanism, and the embedded displacement sensor, the test piece lower clamp and the test piece upper clamp are fixedly assembled with the top of the rotor and the top plate respectively. A power execution module is integrated at the lower part of the instrument, a permanent magnet synchronous motor and a magnetic suspension bearing are combined, and heating parts are reduced, so that the application capability is ensured, the manufacturing cost is effectively reduced, the instrument is more portable and easy to carry, and the equipment sensitivity is improved.

The utility model relates to the technical field of shearing rheometer, and disclose a kind of asphalt dynamic shearing rheometer, including rheometer body, upper plate connected on rheometer body and lower plate connected on the operating platform of rheometer body, the outer wall of the operating platform of rheometer body is connected with mounting ring, L type slide is rotatably connected in the mounting ring, the top of L type slide is slidably connected with scraper, the bottom surface of scraper is slidably connected with the top surface of lower plate, the end outer wall of scraper is slidably connected with lower plug plate.The utility model is cooperatively arranged by mounting ring, L type slide, scraper and lower plug plate, so that overflow is rotated around lower plate by scraper and scraped off, overflow is cut off with the lower insertion of lower plug plate, scraper moves out, and lower plug plate is taken out, so that overflow is concentrated and away from the side of upper plate, overflow is cleaned separately after being separated from upper plate, and the operation between upper plate and lower plate is not delayed.

The invention discloses a method for judging whether a recycled asphalt mixture is doped with an old material or not. The method comprises the following steps: acquiring an asphalt sample of a service pavement; a layered extraction and recovery method is adopted to obtain a three-layer cementing material sample from the designed recycled asphalt mixture; carrying out quantitative characterization on characteristic functional groups of the asphalt sample by adopting Fourier infrared spectrum test to obtain a carbonyl index; a dynamic shear rheometer is adopted to test the complex shear moduli of the cementing material samples in different layers, and the complex shear moduli of the cementing material samples in different layers are obtained; and according to the change rate of the carbonyl index and the change rate of the complex shear modulus, judging whether the recycled asphalt mixture of the service pavement contains the old material or not. On the basis, through the microscopic uniformity angle of the asphalt mixture, asphalt is recycled through layered extraction, the aging condition difference of different layers of the mixed asphalt is determined, and the change gradient of a new and old asphalt fusion area is quantified by adopting a carbonyl index and a complex shear modulus, so that whether the recycled asphalt mixture is doped with the old material or not can be judged.

This invention discloses a damage evolution prediction system for heavy-duty traffic asphalt pavement, relating to the field of road engineering technology. The system includes: a data acquisition module for acquiring continuous multi-frame time-series images of pavement cracks, vehicle axle load spectra, and environmental temperature and humidity data; an image processing and spatiotemporal modeling module for performing multi-scale fractal processing and dynamic time warping on the time-series images to calculate the fractal dimension sequence across scales; a material property correlation module for establishing and updating a probabilistic correlation model between fractal dimension and shear modulus in real time using dynamic shear rheometer test data; a multi-physics data fusion module for fusing multi-physics features through a fractal attention network to generate a multi-physics collaborative damage correction factor; and a damage prediction and early warning module for predicting the fractal dimension growth trend using a fractal domain adaptive transfer learning algorithm and outputting a damage evolution early warning based on viscoelastic phase consistency verification results.

The present application belongs to the technical field of road engineering material testing, and particularly relates to a determination method for judging asphalt similarity based on a rheological curve, which adopts a dynamic shear rheometer to perform frequency scanning at multiple temperature points, and constructs a complex modulus master curve or a phase angle master curve based on the time-temperature equivalence principle. Through calculation of the overlapping degree of the confidence intervals of the difference factor F1, the similarity factor F2 and the WLF temperature sensitivity parameters, quantitative evaluation of the viscoelastic behavior of asphalt materials in the full temperature domain and the full frequency domain is realized. The present application first proposes a double-track determination framework, which can simultaneously reflect the differences in the master curve form and the temperature response characteristics, and supports comparison of multiple states such as unaged, RTFOT aged, PAV aged through a multi-condition batch processing mechanism. The method has high detection efficiency and strong repeatability, and is suitable for engineering application scenarios such as asphalt production quality control, road construction acceptance and oil source compatibility evaluation.

The invention discloses an aggregate and asphalt interface self-healing evaluation method and system, and the method comprises the steps: respectively manufacturing limestone, granite and basalt aggregate test pieces, constructing a dynamic shear rheological test platform, testing the self-healing properties of asphalt interfaces with different lithology by using a dynamic shear rheometer, and evaluating the self-healing properties of the asphalt interfaces in a fatigue-intermittent-fatigue load mode. Parameters such as dynamic shear modulus and loading times are measured at intermittent time, and evaluation is performed by using self-healing indexes, so that not only can the influence of different lithologic aggregates on the asphalt interface interaction be judged, but also the self-healing capability of asphalt under different adhesion conditions, stress states, temperatures and damage conditions can be accurately evaluated, and the evaluation accuracy is improved. The optimal self-healing temperature and adaptive aggregate are obtained; in addition, the aggregate test piece can be used for evaluating the rheological properties of different types of asphalt and aggregate, and provides a basis for screening the optimal asphalt mixture under different traffic volumes and vehicle-mounted environments.

This invention relates to the field of road engineering, specifically to a method for identifying the asphalt-mineral powder interface transition zone based on a dynamic shear rheometer. The method includes: preparing an asphalt-trichloroethylene solution; preparing asphalt mastic and separating free asphalt based on the asphalt-trichloroethylene solution and filtered mineral powder; performing a first elution on the asphalt mastic to obtain an asphalt sample; repeating the asphalt mastic elution process n times; determining the asphalt film thickness of each asphalt sample; conducting a dynamic shear rheological test on each asphalt sample; calculating and plotting the complex shear modulus master curve based on the complex shear modulus, the time-temperature equivalence principle, the WLF equation, and the CAM model; identifying the first asphalt sample whose complex shear modulus master curve shows a significant change trend relative to the previous eluted sample, and obtaining the asphalt-mineral powder interface transition zone thickness based on the asphalt film thickness of the asphalt sample with the significant change trend. This invention accurately identifies the thickness of the asphalt-mineral powder interface transition zone.

The utility model relates to road engineering material test equipment technical field discloses a kind of finishing device for dynamic shear rheometer cone plate fixture, comprising: tool shank;Right-angle tool bar, with connecting end and free end, its connecting end is fixedly connected with tool shank;Double cutting edges, set in right-angle tool bar free end;The double cutting edges include connected flat blade and inclined blade, the included angle between the flat blade and the inclined blade is obtuse angle, for matching the included angle formed by the side surface of cone surface of cone plate fixture;Heating device, set in right-angle tool bar free end interior;For generating heat to double cutting edges heating;The scheme fundamentally avoids the problem that a large number of samples overflow and adhere to the surface of fixture due to tool mismatching in traditional method, significantly improves finishing quality and cleanliness, and further guarantees the accuracy and reliability of subsequent rheology test results.

The application provides a method for determining the non-stick wheel temperature range of emulsified asphalt and application, and particularly relates to the technical field of emulsified asphalt. The method comprises the following steps: A, evaporating the emulsified asphalt to obtain an evaporation residue, and then short-term aging the evaporation residue to obtain a short-term aging sample; B, respectively testing the rheological properties of the evaporation residue and the short-term aging sample by using a dynamic shear rheometer to obtain a first rut factor G* / sinδ and determine a high-temperature grade; and C, performing a temperature scanning test on the evaporation residue by using the dynamic shear rheometer to obtain a second rut factor G* / sinδ and obtain a non-stick wheel temperature range. According to the characteristics of the binder emulsified asphalt, the rheological properties and the temperature scanning are quantitatively characterized by using the dynamic shear rheometer, a scientific method for determining the non-stick wheel temperature range is established, a guidance method is provided for the binder construction, the test cost is reduced, and the work efficiency is improved.

The invention provides a preparation method of low-rolling-resistance modified asphalt suitable for an energy-consumption-reducing road, belongs to the field of energy conservation and emission reduction of asphalt pavements, and solves the problems that the selection basis of a modifier of the current low-rolling-resistance modified asphalt is insufficient, viscoelasticity and energy dissipation are not clear, and a systematic preparation method is lacked. The method comprises the following steps: firstly, selecting matrix asphalt, and doping three modifiers to prepare low-rolling-resistance modified asphalt; secondly, carrying out a temperature and frequency scanning test by utilizing a dynamic shear rheometer to obtain a shear modulus and a phase angle; then testing the low-temperature anti-cracking performance by adopting a bending beam rheometer; then multiple stress creep recovery and linear amplitude scanning tests are carried out, and the elastic recovery capability and the fatigue life are evaluated; and finally analyzing a phase structure and an element and chemical bond structure by combining a laser confocal microscope and an X-ray photoelectron spectroscopy, and determining the optimal formula of the low-rolling-resistance modified asphalt according to the indexes. According to the invention, the rolling resistance of the vehicle during running is reduced, and a new technical approach is provided for the development of energy-consumption-reducing road materials.

The utility model relates to the technical field of road engineering, in particular to an aggregate and asphalt interface self-healing evaluation device which comprises a dynamic shear rheometer, the top in the dynamic shear rheometer is detachably connected with a first clamp, and the bottom in the dynamic shear rheometer is detachably connected with a second clamp. According to the method, the corresponding materials can be effectively sorted, so that the combination between the materials and the asphalt is effectively realized, the materials are provided for self-healing evaluation, the quality of the materials during evaluation is ensured to meet the requirements, the quality of data obtained by evaluation is fully ensured, the difference of different lithologic aggregates on the self-healing performance of the asphalt interface can be accurately evaluated, and the self-healing performance of the asphalt interface is improved. The selection of aggregate and asphalt is optimized, and the overall fatigue resistance and durability of the asphalt pavement are improved.

The application discloses a method for judging whether old materials are mixed in regenerated asphalt mixture, and the method is: obtaining an asphalt sample of a service road; using a layered extraction recovery method to obtain three-layer binder samples of designed regenerated asphalt mixture; using Fourier infrared spectrum testing to quantitatively characterize characteristic functional groups of the asphalt sample, and obtaining a carbonyl index; using a dynamic shear rheometer to test complex shear modulus of different layer binder samples, and obtaining the complex shear modulus of the different layer binder samples; and judging whether the regenerated asphalt mixture of the service road contains old materials according to the change rate of the carbonyl index and the change rate of the complex shear modulus. Based on this, by the micro-uniformity angle of the asphalt mixture, the layered extraction recovery asphalt is used to determine the aging difference of the mixed asphalt at different layers, and the carbonyl index and the complex shear modulus are also used to quantitatively change the gradient of the fusion area of new and old asphalt, so that whether the regenerated asphalt mixture is mixed with old materials can be judged.

The present invention relates to the field of road engineering technology, specifically to a method for predicting asphalt fatigue life at different frequencies, including: preparing a standard asphalt sample for dynamic shear rheometer testing; loading the prepared standard asphalt sample onto the parallel plate of the dynamic shear rheometer, performing a linear amplitude scanning test at different frequencies, and obtaining test data; using a suitable fatigue damage theory to calculate the fatigue life of the asphalt sample; establishing the relationship between the performance parameters and the loading frequency in the fatigue damage theory, constructing a prediction model for asphalt fatigue life, and realizing the prediction of asphalt fatigue life at different frequencies. The asphalt fatigue life prediction model proposed by the present invention takes into account the influence of strain level and loading frequency, and realizes the prediction of asphalt fatigue life at different frequencies. The constructed prediction model is simple in form, the prediction is convenient and fast, and the results are accurate, and it has high practicality.

This invention discloses a salt spray-ultraviolet (UV) cyclic coupling test system and its application method, belonging to the field of road engineering technology. The system consists of a salt spray chamber, a UV irradiation chamber, an environmental parameter control module, and a cross-scale testing unit. The salt spray chamber is equipped with glass nozzles, a disperser, a slot, a temperature sensor, and a humidity sensor; the solution circulation pipeline is configured with a conductivity monitoring module. The UV irradiation chamber is equipped with a broadband UVA / UVB light source. The environmental parameter control module integrates a PID temperature control system, a humidity sensor, and a programmable cyclic function, supporting alternating salt spray-UV cyclic programs. The cross-scale testing unit is compatible with dynamic shear rheometers and four-point bending fatigue devices capable of macroscopic mechanical testing, as well as interfaces for microscopic molecular dynamics simulation software, enabling cross-scale correlation analysis of asphalt material properties. This invention solves the technical problems of isolated environmental parameters and distorted synergistic effects in traditional equipment and testing methods.

The present invention discloses a reverse design method for modified asphalt based on ensemble learning. The method prepares SBS modified asphalt and rubber powder modified asphalt with different dosages based on a high-speed shearing mechanism; performs frequency scanning on the modified asphalt using a dynamic shear rheometer; establishes a data set with a one-to-one correspondence relationship based on modifier dosage - frequency - temperature - complex modulus - phase angle; divides the data set into a training set and a test set; trains a reverse design model for modified asphalt based on the training set; and evaluates the accuracy of the model based on the test set. This method reveals the correlation between modifier dosage and the performance of modified asphalt, realizes the purpose of quickly obtaining the corresponding modifier dosage based on the performance requirements of modified asphalt under specific test conditions, greatly shortens the time cycle, saves natural resources, and is of great significance for improving the overall intelligent level of asphalt materials.

The invention discloses a rapid evaluation method for asphalt performance of a service period asphalt road surface layer, and belongs to the field of road engineering. The rapid evaluation method comprises the steps that S1, a hammer drill with a dust collection function is used for drilling holes in the asphalt pavement, a mixture sample containing stones, stone powder and asphalt is collected, and the total amount of the sample is larger than 200 g; s2, recycling asphalt in the mixture sample; and detecting the asphalt complex modulus G * of the recycled asphalt by using a dynamic shear rheometer, and calculating the asphalt penetration. Compared with the prior art, the method for rapidly evaluating the asphalt performance of the asphalt road pavement in the service period has the characteristics of good accuracy, simplicity, feasibility, small pavement loss and the like.

The invention discloses an epoxy asphalt cement rheological property testing method based on a solid shearing clamp. The epoxy asphalt cement rheological property testing method comprises the following steps: preparing a cylindrical epoxy asphalt cement sample; adhering stainless steel rings to two ends of the sample; placing the sample with the stainless steel ring in a solid shear clamp of a dynamic shear rheometer; carrying out rheological test temperature control on the solid shearing clamp by utilizing a heat preserving furnace; and testing the rheological property of the sample by adopting a dynamic shear rheometer. When the sample is prepared, the epoxy resin main agent and the curing agent are subjected to heat preservation, mixed and sheared according to a preset proportion and then mixed and sheared with asphalt heated to a flowing state according to a preset proportion to obtain the epoxy asphalt cementing material, and the epoxy asphalt cementing material is injected into a cylindrical silicone tube to be cured and then taken out. According to the method, the technical problem that the existing epoxy asphalt cement rheological property testing method is inaccurate and incomplete is solved, the rheological properties of the epoxy asphalt cement at different temperatures and frequencies can be accurately evaluated, and a scientific basis is provided for formula design and performance optimization of the epoxy asphalt cement.

This invention relates to the field of asphalt testing and evaluation, and provides a rapid testing and evaluation method for the thermal storage stability of SBS modified asphalt. This method includes sample preparation, using a dynamic shear rheometer to measure the composite modulus G* and phase angle δ of the sample at a series of test temperatures, calculating the viscoelastic coefficient Vc under the corresponding test temperature conditions, and obtaining the logarithmic viscoelastic coefficient lg(Vc) through linear regression. c The slope K with respect to the test temperature lg(Vc) According to the slope K lg(Vc) Obtain the stability factor S f According to the stability factor S f The thermal storage stability evaluation level of the test sample is determined. The technical solution of this invention can accurately reflect the sensitivity of SBS modified asphalt to test temperature, accurately characterize the dispersion state of SBS polymer in the matrix asphalt, and thus rapidly evaluate the thermal storage stability of SBS modified asphalt. The operation steps are simple, the accuracy is high, and it is suitable for widespread application.