CN114414464A - Asphalt aging test device and method under multi-data-source field real environment - Google Patents
Asphalt aging test device and method under multi-data-source field real environment Download PDFInfo
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Abstract
The invention discloses a device and a method for asphalt aging test under a field real environment with multiple data sources; comprises a sample rack; an instrument mounting rack is arranged at the top of the sample rack; the top of the instrument mounting rack is provided with glass; the bottom of the sample rack is provided with supporting legs; the invention can solve the inaccuracy of the indoor accelerated simulation test of the asphalt, provides a basis for the ultraviolet aging mechanism and the anti-aging measure of the asphalt in the real environment due to the lack of the ultraviolet aging mechanism and the standard system of the asphalt in the real environment at home and abroad, performs statistical analysis by using data indexes such as temperature, humidity, ultraviolet radiation and the like, performs quantitative analysis and graded extraction on the asphalt aging natural environment inducement based on an asphalt aging dynamics model, performs univariate analysis, interaction analysis and coupling superposition effect analysis on the different environment inducements respectively, and calculates the asphalt natural aging environment parameters in the cold and dry areas.
Description
Technical Field
The invention relates to the field of asphalt aging tests, in particular to an asphalt aging test device and method under a field real environment with multiple data sources.
Background
More than 90% of high-grade pavements in China are asphalt pavements, and the service life of the asphalt pavements is directly related to the national economic sustainable development. The main components of the asphalt pavement are asphalt, aggregate, mineral powder and additives, wherein the asphalt is used as a main cementing material and plays a key role in the overall performance of the material. Because the asphalt pavement is in a natural condition for a long time and is subjected to the action of factors such as oxygen, temperature, illumination, tail gas, rainfall and the like, the aging phenomenon is easy to occur, so that the adhesive capacity among the pavement composition materials is reduced, the development of early diseases such as cracking, loosening, rutting, pit and the like is accelerated, the service performance and service life of the asphalt pavement are reduced, and the great challenge is brought to the pavement maintenance. However, at present, the data of a long-term and full-life-cycle field exposure test of asphalt under typical natural-area and typical geological conditions are lacked, the exploration of a natural decay mechanism and an evolution rule of the asphalt under a typical climate real environment of a northwest cold and drought strong ultraviolet region is lacked, the natural aging and anti-aging research of the asphalt pavement in the cold and drought region is lacked, and a unified standard system is not formed yet.
Experts and scholars at home and abroad carry out a great deal of research on the aging of related asphalt materials, but the research on the aging of asphalt in the real environment of cold, drought and strong ultraviolet areas is relatively few, and a unified standard system is not formed yet. The project deeply analyzes the aging mechanism and the consistency of the characteristics of different scales of the asphalt and the performance of the mixture thereof under the coupling condition of multiple factors such as large temperature difference, strong ultraviolet rays, extreme drought and the like, further provides relatively reasonable evaluation indexes, forms a reliable and complete aging evaluation system, and can fill the blank of the technical field.
(1) The aging of the asphalt is researched more, but most of the asphalt is simulated by a laboratory, the evolution rule of the asphalt performance under the real environment of long-term, whole life cycle, systematization and diversification in the typical climatic region and the typical geological condition is not explored, the natural aging mechanism of the asphalt pavement performance cannot be reflected truly, and the relation between the laboratory asphalt aging data and the field natural aging data is not established.
(2) Because natural aging observation data of asphalt under all-weather and multi-factor coupling conditions are lacked as supports, the existing method for simulating the aging of asphalt in service is single, and an all-weather aging simulation test method with the coupling effect of various environmental factors is lacked, the aging of a laboratory simulation and an actual pavement is greatly different, and how the indoor ultraviolet aging equipment really and effectively simulates the aging of asphalt in a natural environment also needs a great deal of improvement work.
(3) The existing anti-aging process is relatively basic, the optimization process of the petroleum fractionation process is complex and difficult to operate, the anti-aging effect in the actual engineering is not easy to guarantee, and the construction cost is high; the addition of the anti-aging material is the current main research direction, and due to the lack of asphalt aging mechanism as theoretical support, the selection and the action effect of the anti-aging material lack pertinence; a uniform and effective anti-aging quantitative evaluation method is not formed, the anti-aging effect of the anti-aging material cannot be effectively evaluated, and the difficulty in selecting the anti-aging material is increased; the gradation, the pore structure and the like of the mixture have important influence on the anti-aging effect of the asphalt pavement, but the research on the aspects of an anti-aging asphalt mixture design method, a construction process and the like is lacked at present.
Therefore, under the complex and severe climatic environment, particularly in the northwest cold and dry areas, the temperature difference is large, the ultraviolet rays are strong, and under the comprehensive action of the natural environment, the asphalt is easy to cause the diseases such as cracks, pits, peeling and the like on the pavement, thereby seriously affecting the service life of the asphalt pavement. The research method is mainly based on the climatic environment of the cold and drought strong ultraviolet region in the northwest, takes other different climatic environment regions as research assistance, establishes the gradient relation of ultraviolet rays in different typical climatic regions in China to the asphalt aging rule by developing an asphalt aging test device under the field real environment with multiple data sources and proposing an asphalt field exposure test method, specifically discloses the molecular mechanism of asphalt aging under the field real environment with the cold and drought strong ultraviolet region, develops an indoor accelerated aging simulation test device, establishes a comprehensive evaluation system of asphalt aging and aging resistance in the climatic regions, proposes an asphalt targeting aging resistance technology, has important significance for the development of long-life asphalt pavement, is beneficial to improving the construction and maintenance level of the asphalt pavement of the highway in the cold and drought strong ultraviolet region, and guarantees the pavement performance of the asphalt pavement in the whole life cycle.
Disclosure of Invention
The invention aims to provide a device and a method for an asphalt aging test under a field real environment with multiple data sources so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
an asphalt aging test device under a field real environment with multiple data sources comprises a sample rack; an instrument mounting rack is arranged at the top of the sample rack; the top of the instrument mounting rack is provided with glass; the bottom of the sample rack is provided with supporting legs; a sample plate is arranged in the sample rack; and a filter screen is arranged at the bottom of the sample plate.
As a still further scheme of the invention: the upper side of the sample tray is provided with a plurality of asphalt sample trays with the diameter of one hundred forty millimeters.
As a still further scheme of the invention: and a gasket is arranged between the glass and the sample rack.
As a still further scheme of the invention: the glass is pasted with films with different ultraviolet passing rates, the film with each passing rate corresponds to one asphalt sample plate, a clamping groove structure which can facilitate installation of galvanized iron sheets is arranged on the glass, and the galvanized iron sheets can be placed to cover sunlight without illumination.
As a still further scheme of the invention: the filter screen is a 250-mesh stainless steel filter screen.
As a still further scheme of the invention: the front side of the instrument mounting frame is sequentially provided with a temperature and humidity ultraviolet radiation sensor, a camera, a colorimeter and a digital display screen from right to left; the temperature and humidity ultraviolet radiation sensor, the camera and the colorimeter are in wireless transmission, and data can be checked in a remote indoor environment in real time; and the temperature and humidity ultraviolet radiation sensor, the camera and the colorimeter are connected with a PCB control board in the digital display screen through leads, and the current temperature, humidity and ultraviolet radiation basic data are displayed in real time.
A method for asphalt aging test under a multi-data-source field real environment comprises the following steps: the method comprises the following steps:
preparation of asphalt samples
(1) Selecting an asphalt material: different oil sources and different batches of various asphalts can be selected according to test requirements;
(2) selecting an asphalt sample plate: a standard asphalt sample pan for a rotary film oven was selected, the aging pan being a 140mm diameter circular disk. And asphalt sample trays with different sizes can be customized according to requirements and placed on the tray in the box body.
(3) Short term aging of asphalt binders: carrying out short-term aging on different types of asphalt samples according to a rotary film oven (RTFOT) in road engineering asphalt and asphalt mixture test procedures (JTG E20-2011), and simulating the aging in the actual mixing process;
(4) selecting the thickness of the asphalt binder film: the ultraviolet light has very limited penetrating power on asphalt, the selection of the thickness of the asphalt film is very important, the thinner the thickness of the asphalt film means that the ultraviolet aging effect on the asphalt film is more obvious, therefore, the thickness of the asphalt binder film is planned to be 3.18mm by research and research at home and abroad in combination with the existing standard and actual pavement conditions, and asphalt samples with different thicknesses can be manufactured according to different test schemes;
(5) preparing an asphalt sample in a real environment of a whole climate area: in order to more scientifically, reasonably and truly reflect the change rule of the performance of the asphalt material in the use process of different typical climate areas, firstly, the asphalt binder is aged in a short period, then, 50 +/-0.5 g of different asphalt binders aged in the short period are poured into an aging tray, the aging tray is placed in different working conditions for long-term aging with different exposure times, and finally, samples of the asphalt binder are periodically collected to obtain real environment aging samples of the asphalt binder under different working conditions, different exposure times and different types;
the sampling period and frequency can be determined by the experimenter.
The working conditions are studied:
(1) all-weather natural exposure (case upper part without cover and glass)
(2) Thermal oxidation aging: galvanized sheet (shading galvanized sheet iron without glass cover on box)
(3) Ultraviolet aging: different ultraviolet transmitting glass (different ultraviolet transmitting glass cover box)
Firstly, the ultraviolet light passing rate is 10 percent;
② the ultraviolet passing rate is 50 percent;
③ 80 percent of ultraviolet passing rate;
fourthly, the ultraviolet passing rate is 90 percent.
Compared with the prior art, the invention has the beneficial effects that:
the invention can solve the inaccuracy of the indoor accelerated simulation test of the asphalt, provides a basis for the ultraviolet aging mechanism and the anti-aging measure of the asphalt in the real environment due to the lack of the ultraviolet aging mechanism and the standard system of the asphalt in the real environment at home and abroad, performs statistical analysis by using data indexes such as temperature, humidity, ultraviolet radiation and the like, performs quantitative analysis and graded extraction on the asphalt aging natural environment inducement based on an asphalt aging dynamics model, performs univariate analysis, interaction analysis and coupling superposition effect analysis on the different environment inducements respectively, and calculates the asphalt natural aging environment parameters in the cold and dry areas.
By utilizing the developed multi-data-source test device and placing the device in a typical climate field environment subarea of China, the standardization of the ultraviolet aging of the asphalt in the field observation research can be effectively standardized, and the echeloned layout of the ultraviolet aging of the asphalt is established. By integrating the mining analysis of climate environment data and the collection of periodic asphalt samples, the test method comprises the following steps:
firstly, the aging mechanisms of different kinds of asphalt are analyzed on a microscopic molecular level, the aging sensitive inducement of the asphalt is proved, the asphalt targeting aging technology is researched, and the asphalt targeting aging resistant material is developed by comprehensively considering physical and chemical analysis methods. Then, local climate conditions are collected, corresponding environment generators are selected, the accelerated aging simulation test device in the cold and dry area is assembled and developed, test parameters of the device and simulation corresponding years are determined through sample performance matching, and asphalt aging and aging resistance evaluation methods and indexes are provided. And finally, establishing a relation among the chemical composition, the microscopic characteristic and the macroscopic performance of the multi-scale behavior characteristic of the common asphalt in typical different climatic environments, analyzing the consistency of the behavior characteristic of the asphalt and the performance of the mixture thereof in different scales, providing a reasonable evaluation index in the area, and predicting the influence of aging on the road performance. The smooth development of the research is helpful for revealing the molecular mechanism of the asphalt aging in the cold and dry area, developing an accelerated aging simulation test device in the cold and dry area, establishing a comprehensive evaluation system for the asphalt aging and the aging resistance in the cold and dry area, providing an asphalt targeting aging technology in the cold and dry area, and having important significance for the development of long-life asphalt pavements.
Drawings
FIG. 1 is a schematic perspective view of an asphalt aging test device under a field real environment with multiple data sources.
Fig. 2 is a schematic view of a top view structure of a sample tray 2 in an asphalt aging test device under a real environment in the field with multiple data sources.
FIG. 3 is a schematic diagram of a top view structure of a filter screen in an asphalt aging test device under a real field environment with multiple data sources.
In the figure: the device comprises supporting legs 1, a filter screen 2, a sample disc 3, a sample rack 4, an instrument mounting rack 5, glass 6, a temperature and humidity ultraviolet radiation sensor 7, a camera 8, a colorimeter 9 and a digital display screen 10.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 3, in the embodiment of the present invention, an asphalt aging test apparatus under a field real environment with multiple data sources includes a sample rack 4; an instrument mounting rack 5 is arranged at the top of the sample rack 4; the top of the instrument mounting frame 5 is provided with glass 6; the bottom of the sample rack 4 is provided with a supporting leg 1; a sample plate 3 is arranged in the sample rack 4; and a filter screen 2 is arranged at the bottom of the sample plate 3.
The upper side of the sample plate 3 is provided with a plurality of asphalt sample plates with the diameter of one hundred forty millimeters.
And a gasket is arranged between the glass 3 and the sample rack 1.
The filter screen 2 is a stainless steel filter screen of 250 meshes.
The front side of the instrument mounting frame 5 is sequentially provided with a temperature and humidity ultraviolet radiation sensor 7, a camera 8, a colorimeter 9 and a digital display screen 10 from right to left; the temperature and humidity ultraviolet radiation sensor 7, the camera 8 and the colorimeter 9 are in wireless transmission, and data can be checked in real time in a remote room; and the temperature and humidity ultraviolet radiation sensor 7, the camera 8 and the colorimeter 9 are connected with a PCB control board inside the digital display screen 10 through leads, and display basic data of current temperature, humidity and ultraviolet radiation in real time.
A method for asphalt aging test under a multi-data-source field real environment comprises the following steps: the method comprises the following steps:
preparation of asphalt samples
(1) Selecting an asphalt material: different oil sources and different batches of various asphalts can be selected according to test requirements;
(2) selecting an asphalt sample plate: a standard asphalt sample pan for a rotary film oven was selected, the aging pan being a 140mm diameter circular disk. And asphalt sample trays with different sizes can be customized according to requirements and placed on the tray in the box body.
(3) Short term aging of asphalt binders: carrying out short-term aging on different types of asphalt samples according to a rotary film oven (RTFOT) in road engineering asphalt and asphalt mixture test procedures (JTG E20-2011), and simulating the aging in the actual mixing process;
(4) selecting the thickness of the asphalt binder film: the ultraviolet light has very limited penetrating power on asphalt, the selection of the thickness of the asphalt film is very important, the thinner the thickness of the asphalt film means that the ultraviolet aging effect on the asphalt film is more obvious, therefore, the thickness of the asphalt binder film is planned to be 3.18mm by research and research at home and abroad in combination with the existing standard and actual pavement conditions, and asphalt samples with different thicknesses can be manufactured according to different test schemes;
(5) preparing an asphalt sample in a real environment of a whole climate area: in order to more scientifically, reasonably and truly reflect the change rule of the performance of the asphalt material in the use process of different typical climate areas, firstly, the asphalt binder is aged in a short period, then, 50 +/-0.5 g of different asphalt binders aged in the short period are poured into an aging tray, the aging tray is placed in different working conditions for long-term aging with different exposure times, and finally, samples of the asphalt binder are periodically collected to obtain real environment aging samples of the asphalt binder under different working conditions, different exposure times and different types;
the sampling period and frequency can be determined by the experimenter.
The working conditions are studied:
(1) all-weather natural exposure (case upper part without cover and glass)
(2) Thermal oxidation aging: galvanized sheet (shading galvanized sheet iron without glass cover on box)
(3) Ultraviolet aging: different ultraviolet transmitting glass (different ultraviolet transmitting glass cover box)
Firstly, the ultraviolet light passing rate is 10 percent;
② the ultraviolet passing rate is 50 percent;
③ 80 percent of ultraviolet passing rate;
fourthly, the ultraviolet passing rate is 90 percent.
The working principle of the invention is as follows:
different from ultraviolet-passing filter glass or light-blocking glass (ultraviolet rays are not allowed to enter, and the box body is still ventilated), the glass only allows ultraviolet rays to pass through, and the ultraviolet ray passing rate is 10 percent; ② the ultraviolet passing rate is 50 percent; ③ 80 percent of ultraviolet passing rate; ultraviolet ray passing rate is 90%, and different ultraviolet rays are used for researching the influence of ultraviolet ray intensity in different regions on the aging performance of the asphalt. The box body device has the functions of ventilation and gas exchange with the outside, and the temperature, humidity and ultraviolet sensors are arranged in the box body, so that real-time wireless transmission can be realized; still be equipped with automatic photographing and chrominance analysis function in the box, regularly take a picture and to the wireless transmission of chrominance data to the pitch sample, can study the change of pitch surface appearance.
By the method and the establishment of a research system, the inaccuracy of indoor accelerated simulation tests of the asphalt can be solved, the ultraviolet aging mechanism and the standard system of the asphalt in the real environment are lacked at home and abroad, a basis can be provided for the ultraviolet aging mechanism and the anti-aging measures of the asphalt in the real environment, statistical analysis is carried out by using data indexes such as temperature, humidity and ultraviolet radiation, quantitative analysis and graded extraction are carried out on the asphalt aging natural environment inducement based on an asphalt aging kinetic model, univariate analysis, interaction analysis and coupling superposition effect analysis are respectively carried out on the different environment inducements, the asphalt natural aging environment parameters in the arid region are calculated, and then corresponding environment generators are developed and simulated through matching the environment parameters to assemble and develop indoor accelerated aging simulation test devices in the arid region.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. The asphalt aging test device under the field real environment with multiple data sources is characterized by comprising a sample rack (4); an instrument mounting rack (5) is arranged at the top of the sample rack (4); the top of the instrument mounting frame (5) is provided with glass (6); the bottom of the sample rack (4) is provided with a supporting leg (1); a sample plate (3) is arranged in the sample rack (4); and a filter screen (2) is arranged at the bottom of the sample plate (3).
2. The asphalt aging test device under the field real environment with multiple data sources as claimed in claim 1, wherein the upper side of the sample tray (3) is provided with a plurality of asphalt sample trays with the diameter of one hundred forty millimeters.
3. The asphalt aging test device under the field real environment with multiple data sources as claimed in claim 1, wherein a gasket is arranged between the glass (3) and the sample rack (1).
4. The asphalt aging test device under the field real environment with multiple data sources as claimed in claim 1, wherein the glass (3) is pasted with films with different ultraviolet passing rates, each film with a passing rate corresponds to an asphalt sample plate, and the glass (3) is provided with a slot structure which can facilitate installation of galvanized iron sheets, so that the galvanized iron sheets can be placed to cover the sunlight without illumination.
5. The asphalt aging test device under the field real environment with multiple data sources as claimed in claim 1, wherein the filter screen (2) is a 250-mesh stainless steel filter screen.
6. The asphalt aging test device under the field real environment with multiple data sources as claimed in claim 1, wherein the front side of the instrument mounting rack (5) is sequentially provided with a temperature and humidity ultraviolet radiation sensor (7), a camera (8), a colorimeter (9) and a digital display screen (10) from right to left; the temperature and humidity ultraviolet radiation sensor (7), the camera (8) and the colorimeter (9) are in wireless transmission, and data can be checked in a remote indoor mode in real time; and the temperature and humidity ultraviolet radiation sensor (7), the camera (8) and the colorimeter (9) are connected with a PCB control board in the digital display screen (10) through leads, so that basic data of current temperature, humidity and ultraviolet radiation are displayed in real time.
7. The asphalt aging test method under the field real environment with multiple data sources as claimed in any one of claims 1 to 6, characterized by comprising the following steps:
preparation of asphalt samples
(1) Selecting an asphalt material: different oil sources and different batches of various asphalts can be selected according to test requirements;
(2) selecting an asphalt sample plate: a standard asphalt sample pan for a rotary film oven was selected, the aging pan being a 140mm diameter circular disk. And asphalt sample trays with different sizes can be customized according to requirements and placed on the tray in the box body.
(3) Short term aging of asphalt binders: carrying out short-term aging on different types of asphalt samples according to a rotary film oven (RTFOT) in road engineering asphalt and asphalt mixture test procedures (JTG E20-2011), and simulating the aging in the actual mixing process;
(4) selecting the thickness of the asphalt binder film: the ultraviolet light has very limited penetrating power on asphalt, the selection of the thickness of the asphalt film is very important, the thinner the thickness of the asphalt film means that the ultraviolet aging effect on the asphalt film is more obvious, therefore, the thickness of the asphalt binder film is planned to be 3.18mm by research and research at home and abroad in combination with the existing standard and actual pavement conditions, and asphalt samples with different thicknesses can be manufactured according to different test schemes;
(5) preparing an asphalt sample in a real environment of a whole climate area: in order to more scientifically, reasonably and truly reflect the change rule of the performance of the asphalt material in the use process of different typical climate areas, firstly, the asphalt binder is aged in a short period, then, 50 +/-0.5 g of different asphalt binders aged in the short period are poured into an aging tray, the aging tray is placed in different working conditions for long-term aging with different exposure times, and finally, samples of the asphalt binder are periodically collected to obtain real environment aging samples of the asphalt binder under different working conditions, different exposure times and different types;
the sampling period and frequency can be determined by the experimenter.
The working conditions are studied:
(1) all-weather natural exposure (case upper part without cover and glass)
(2) Thermal oxidation aging: galvanized sheet (shading galvanized sheet iron without glass cover on box)
(3) Ultraviolet aging: different ultraviolet transmitting glass (different ultraviolet transmitting glass cover box)
Firstly, the ultraviolet light passing rate is 10 percent;
② the ultraviolet passing rate is 50 percent;
③ 80 percent of ultraviolet passing rate;
fourthly, the ultraviolet passing rate is 90 percent.
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| CN115032141A (en) * | 2022-08-11 | 2022-09-09 | 北京建筑大学 | Method for determining indoor ultraviolet aging parameters of asphalt by simulating alternation of day and night in natural environment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115032141A (en) * | 2022-08-11 | 2022-09-09 | 北京建筑大学 | Method for determining indoor ultraviolet aging parameters of asphalt by simulating alternation of day and night in natural environment |
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