12 results about "Dynamic shear rheometer" patented technology

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 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.

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.

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 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.

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 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.

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.