CN114235670B - Asphalt ultraviolet aging test method with control group - Google Patents
Asphalt ultraviolet aging test method with control group Download PDFInfo
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- CN114235670B CN114235670B CN202111434654.1A CN202111434654A CN114235670B CN 114235670 B CN114235670 B CN 114235670B CN 202111434654 A CN202111434654 A CN 202111434654A CN 114235670 B CN114235670 B CN 114235670B
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- 239000010426 asphalt Substances 0.000 title claims abstract description 207
- 230000032683 aging Effects 0.000 title claims abstract description 172
- 238000010998 test method Methods 0.000 title claims abstract description 13
- 238000012360 testing method Methods 0.000 claims abstract description 232
- 230000035515 penetration Effects 0.000 claims abstract description 31
- 230000014759 maintenance of location Effects 0.000 claims abstract description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 7
- 239000001301 oxygen Substances 0.000 claims abstract description 7
- 238000011156 evaluation Methods 0.000 claims abstract description 6
- 230000002431 foraging effect Effects 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 83
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 30
- 229910052753 mercury Inorganic materials 0.000 claims description 30
- 239000007921 spray Substances 0.000 claims description 24
- 238000005192 partition Methods 0.000 claims description 13
- 239000011521 glass Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 230000000052 comparative effect Effects 0.000 claims description 9
- 238000005507 spraying Methods 0.000 claims description 8
- 238000009423 ventilation Methods 0.000 claims description 7
- 238000004088 simulation Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 206010051246 Photodermatosis Diseases 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000008845 photoaging Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/004—Investigating resistance of materials to the weather, to corrosion, or to light to light
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
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Abstract
The invention provides an asphalt ultraviolet aging test method with a control group, which comprises the steps of preparing an asphalt test piece, placing the asphalt test piece into a test box for aging contrast test, taking out the tested asphalt test piece, testing, evaluating the ultraviolet aging resistance of asphalt and the like; the invention can simulate the influence of rain wash and ultraviolet rays on asphalt aging, and can also contrast and research the influence degree of thermal oxygen and ultraviolet rays on asphalt aging under the condition of keeping the same temperature and humidity in the whole test box body; the influence of different ultraviolet heights on asphalt aging can be simulated by adjusting the height of the carrying disc; the invention provides detailed, full and accurate control data for the ultraviolet aging test of asphalt, and uses the residual penetration ratio, the ductility retention and the viscosity aging index as evaluation indexes to more comprehensively and reliably evaluate the ultraviolet aging resistance of asphalt.
Description
Technical Field
The invention relates to the field of asphalt aging technology simulation, in particular to an ultraviolet aging test method for asphalt with a control group.
Background
With the wide application of asphalt pavement in China and the damage of ozone layer caused by environmental pollution, the aging problem of asphalt pavement is increasingly revealed. Asphalt aging has a plurality of influencing factors, asphalt aging occurs in the processes of asphalt storage, transportation, preparation, later pavement use and the like, and the influence of heating, oxygen, illumination and water on the asphalt aging is greatest, especially under the action of intense ultraviolet rays, asphalt becomes fragile gradually, adhesiveness is reduced, and the low-temperature performance and the water stability of an asphalt mixture are reduced sharply, so that the ultraviolet aging resistance of the asphalt mixture must be simulated before the asphalt is applied to a pavement.
The photo-aging of asphalt comprises thermal oxidation aging and ultraviolet aging, and in order to reduce the influence of thermal oxidation aging on the ultraviolet aging simulation result of asphalt, the influence of a single ultraviolet factor on the aging of asphalt is studied, and the current ultraviolet aging simulation equipment and method are limited to temperature control or oxygen isolation. The equipment needs external heating, cooling and vacuum equipment, and the structure is often more complicated.
The existing asphalt ultraviolet aging device is used for guaranteeing that an asphalt sample is uniformly irradiated by ultraviolet rays, an ultraviolet lamp is positioned right above the asphalt sample, a spray header is used for preventing ultraviolet rays from being shielded by the spray header, the spray header is generally positioned on the side edge of the ultraviolet lamp, or the side edge of the asphalt sample cannot be uniformly washed by water, and the authenticity of test data results is affected.
Most of the prior asphalt ultraviolet aging devices are directly fixed at the lower part of the inner side of an asphalt ultraviolet aging box, and the distance between an ultraviolet lamp and an asphalt sample cannot be adjusted. There are also devices that move up and down by driving the stage or the uv lamp with a motor, but due to the influence of the temperature and humidity in the box, equipment malfunction is easily caused, which affects the test.
Disclosure of Invention
Aiming at the defects in the background technology, the invention provides an ultraviolet aging test method for asphalt with a control group, which simulates the aging conditions of the asphalt under the conditions of natural temperature and humidity, rainfall and ultraviolet irradiation, and provides quick and reliable comparison data for the asphalt aging test by setting the control group.
In order to solve the technical problems, the invention adopts the following technical scheme: a method for ultraviolet aging testing asphalt with a control group, comprising the steps of:
Step S1: firstly, preparing a plurality of asphalt test pieces, and then equally dividing the prepared asphalt test pieces into two groups, wherein one group is an asphalt ultraviolet aging test group, and the other group is an asphalt aging control test group.
Step S2: and respectively placing the two groups of asphalt test pieces into corresponding test areas in the test box, adjusting the distances between the two groups of asphalt test pieces and the high-pressure mercury lamps in the test box to 50-70 mm, adjusting the test environment through the temperature and humidity control assembly, then placing the two groups of asphalt test pieces in the test box for aging for 21 days, and carrying out a comparison test in the aging process.
Step S3: and after the ageing test is finished, taking out two groups of asphalt test pieces.
Step S4: and respectively testing penetration, ductility and viscosity of the two groups of asphalt test pieces after the aging test, and evaluating the ultraviolet aging resistance of asphalt by taking the penetration, ductility and viscosity as evaluation indexes.
The inside of the test box body is divided into an asphalt ultraviolet aging test area and an asphalt aging control test area by a partition board, a group of bearing components for placing asphalt test pieces are arranged in the asphalt ultraviolet aging test area and the asphalt aging control test area, the asphalt test pieces of the asphalt ultraviolet aging test group are placed on the bearing components in the asphalt ultraviolet aging test area, and the asphalt test pieces of the asphalt aging control test group are placed on the bearing components in the asphalt aging control test area; and a high-pressure mercury lamp matched with the two groups of asphalt test pieces is arranged above the inside of the test box body.
The bearing assembly comprises a carrying disc, the carrying disc is connected with a threaded straight rod through a nut, and the threaded straight rod is vertically fixed on the bottom wall of the test box body; and a plurality of sample trays matched with the asphalt test pieces are arranged on the carrying disc.
The temperature and humidity control assembly comprises a temperature and humidity sensor, the temperature and humidity sensor is arranged on a partition plate, an exhaust fan is further arranged on the partition plate, the exhaust fan is connected with a power assembly, the power assembly is arranged on the outer side of the top wall of the test box body, and the temperature and humidity sensor and the power assembly are both connected with a control unit; two ventilation openings are formed in the top wall of the test box body, and the two ventilation openings correspond to the asphalt ultraviolet aging test area and the asphalt aging control test area respectively.
In the step S2, the operation steps when the two groups of asphalt test pieces are subjected to the comparative test in the aging process include: the method comprises the steps of keeping the test environment in an asphalt ultraviolet aging test area unchanged, installing a spraying assembly in an asphalt aging control test area, simulating rainfall on an asphalt test piece of the asphalt aging control test group by using the rainfall simulating environment of the spraying assembly, and turning on a high-pressure mercury lamp after spraying; and (3) repeating the step S3 and the step S4, and comparing whether the influence of rain wash on the ultraviolet ageing performance of the asphalt exists under the same temperature and humidity conditions through a test.
The spray assembly comprises a spray header, the spray header is arranged on a movable rod and is positioned above the sample tray, the movable rod is arranged on the side wall of the test box body through a mounting piece, and the spray header is connected with a circulating water supply device; the circulating water supply device comprises a water supply pump, the water supply pump is connected with the control unit, a water inlet of the water supply pump is communicated with the water tank, a water outlet of the water supply pump is communicated with the spray header through a water outlet pipeline, one end of the water outlet pipeline is arranged on the inner side of the movable rod, and the other end of the water outlet pipeline is provided with a water flowmeter; the water tank is communicated with a water collecting funnel through a return pipeline, the water collecting funnel is arranged below the bottom plate of the test box body, and a drain hole is formed in the bottom plate of the test box body and corresponds to the water collecting funnel.
The movable rods are arranged in number and are connected through connecting blocks; the connecting block is of a hollow structure and comprises an upper part and a lower part, and the upper part and the lower part are rotationally connected through a rotating shaft; the water outlet pipeline is respectively connected with the upper part and the lower part of the connecting block.
In the step S2, the operation steps when the two groups of asphalt test pieces are subjected to the comparative test in the aging process include: maintaining the test environment in the asphalt ultraviolet aging test area unchanged, installing filter glass above the inside of the asphalt aging control test area, and opening a high-pressure mercury lamp; and repeating the step S3 and the step S4, and comparing whether the ultraviolet irradiation has influence on the ultraviolet ageing performance of the asphalt under the same humidity and hot oxygen conditions or not.
In the step S2, the operation steps when the two groups of asphalt test pieces are subjected to the comparative test in the aging process include: the distance between the asphalt test piece of the asphalt ultraviolet aging test group and the high-pressure mercury lamp is adjusted to be 50-70 mm, the distance between the asphalt test piece of the asphalt aging control test group and the high-pressure mercury lamp is adjusted to be 80-100 mm, and the high-pressure mercury lamp is turned on; and repeating the step S3 and the step S4, and comparing the influence of different ultraviolet irradiation heights on the ultraviolet ageing performance of the asphalt under the same temperature and humidity conditions.
Selecting the residual penetration ratio as an index for representing the penetration attenuation amplitude in the ultraviolet aging process of the asphalt; adopting a ductility retention rate to represent an index of ductility attenuation amplitude in the ultraviolet aging process of the asphalt; selecting a viscosity ageing index as an index for evaluating the ageing degree of asphalt;
Wherein: the residual penetration ratio is:
wherein: p 1 -before-aging penetration, P 2 -after-aging penetration, PRR-residual penetration ratio;
The retention rate of ductility is:
Wherein: d 1 -the pre-aging ductility value, D 2 -the post-aging ductility value, DRR-the ductility retention;
the viscosity aging index is:
Wherein: eta 1 -pre-aging viscosity, eta 2 -post-aging viscosity, VAI-viscosity aging index.
When the invention is specifically operated, the influence of rain wash and ultraviolet rays on asphalt aging can be simulated, the spray assembly can be closed, filter glass is arranged, the temperature and the humidity in the whole test box body are kept the same, and then the influence degree of thermal oxygen and ultraviolet rays on asphalt aging is compared and studied; the influence of different ultraviolet heights on asphalt aging can be simulated by adjusting the height of the carrying disc; the invention provides detailed, full and accurate control data for the ultraviolet aging test of asphalt, and uses the residual penetration ratio, the ductility retention and the viscosity aging index as evaluation indexes to more comprehensively and reliably evaluate the ultraviolet aging resistance of asphalt.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic view of a carrier assembly according to the present invention;
FIG. 3 is a schematic view of the structure of the movable rod of the present invention;
Fig. 4 is an enlarged view at a in fig. 3.
In the figure: the device comprises a power component 1, a ventilation opening 2, a high-pressure mercury lamp 3, a partition plate 4, a sample tray 5, a carrying disc 6, a threaded straight rod 7, a test box 8, an exhaust fan 9, filter glass 10, a spray header 11, a movable rod 12, a water flow meter 13, a water supply pump 14, a temperature and humidity sensor 15, a support rod 16, a drain hole 17, a water collecting funnel 18, a control unit 19, a water tank 20, a nut 21, a water outlet pipeline 22, a mounting piece 23, an upper part 24-1, a lower part 24-2 and a rotating shaft 25.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without any inventive effort, are intended to be within the scope of the invention.
Example 1 as shown in fig. 1, the present invention provides a method for ultraviolet aging test of asphalt with a control group, specifically comprising the following steps:
step S1: firstly, preparing a plurality of asphalt test pieces, firstly pouring mixed asphalt into a circular tray for molding, and then equally dividing the molded asphalt test pieces into two groups, wherein one group is an asphalt ultraviolet aging test group, and the other group is an asphalt aging control test group. In this example, 18 asphalt test pieces were prepared and equally divided into two groups of 9 pieces each for ultraviolet aging test and control test, respectively. The asphalt test piece is a cylinder with the height of 30mm and the diameter of 80 mm.
Step S2: the asphalt test pieces of two groups are respectively placed in the corresponding test areas in the test box body 8, specifically, the inside of the test box body 8 is divided into two asphalt ultraviolet aging test areas and asphalt aging control test areas which are arranged side by side left and right through the vertically arranged partition board 4, in the embodiment, the asphalt ultraviolet aging test areas are arranged on the left side of the test box body 8, the asphalt aging control test areas are arranged on the right side of the test box body 8, a group of bearing components used for placing the asphalt test pieces are arranged in the asphalt ultraviolet aging test areas and the asphalt aging control test areas, during aging test, the asphalt test pieces of the asphalt ultraviolet aging test groups are placed on the bearing components in the asphalt ultraviolet aging control test areas, and the asphalt test pieces of the asphalt aging control test groups are placed on the bearing components in the asphalt aging control test areas. The bearing assembly comprises a carrying disc 6, the carrying disc 6 is connected with a threaded straight rod 7 through a nut 21 at the center of the carrying disc 6, the threaded straight rod 7 is vertically fixed on the bottom wall of the test box body 8, and the distance between the carrying disc 6 and the high-pressure mercury lamp 3 is adjusted by rotating the nut 21 below the carrying disc 6 by applying the working principle of a lead screw guide rail. The carrying disc 6 is provided with a plurality of sample trays 5 matched with the asphalt test pieces, and the asphalt test pieces are placed in the corresponding sample trays 5 during test.
The inside top of test box 8 is provided with and two sets of pitch test piece assorted high-pressure mercury lamp 3, and high-pressure mercury lamp 3 is located two sets of bearing assembly's top, and the both ends of high-pressure mercury lamp 3 are fixed through two bracing pieces 16 of the inside left and right sides of test box, and the both ends of preferably high-pressure mercury lamp 3 are installed on corresponding bracing piece 16 through bolt or other mounting respectively, realize that high-pressure mercury lamp 3 can dismantle to the change banks of lamps of being convenient for. The high-pressure mercury lamp 3 provides an ultraviolet irradiation environment for the test. The height of the carrying disc 6 is adjusted by rotating the nut 21, so that the distance between the two groups of asphalt test pieces and the high-pressure mercury lamp 3 in the test box body 8 is adjusted to be 50-70 mm. And then the test environment is regulated by the temperature and humidity control assembly.
The test box body 8 is respectively provided with an ultraviolet intensity sensor and a control unit 19, the model of the ultraviolet intensity sensor is HA-340, and the ultraviolet intensity sensor is specifically arranged on the partition board 4 and used for detecting the ultraviolet irradiation intensity of the high-pressure mercury lamp 3. The ultraviolet intensity sensor is connected to the control unit 19 to transmit a detection signal to the control unit 19.
The temperature and humidity control assembly comprises a temperature and humidity sensor 15 with a model number of HMT120, the temperature and humidity sensor 15 is arranged on the partition board 4, an exhaust fan 9 is further arranged on the partition board 4, the exhaust fan 9 is connected with a power assembly 1, the power assembly 1 is arranged on the outer side of the top wall of the test box body 8, and the power assembly 1 can adopt an existing fan driving motor assembly structure and is used for providing power for the exhaust fan 9. The temperature and humidity sensor 15 and the power assembly 1 are both connected with the control unit 19. Two ventilation openings 2 are formed in the top wall of the test box body 8, and the two ventilation openings 2 correspond to the asphalt ultraviolet aging test area and the asphalt aging control test area respectively. The temperature and humidity sensor 15 is used for detecting the temperature and humidity of the asphalt ultraviolet aging test area and the asphalt aging control test area and transmitting the temperature and humidity to the control unit 19, and the control unit 19 controls the exhaust fan 9 to work by driving the power assembly 1, so that the temperature and humidity environment in the whole test box body is regulated. In the test, the power assembly 1 is started by the control unit 19 to control the exhaust fan 9 to work, the aging temperature is set to be 25-40 ℃, after the test environment is adjusted, two groups of asphalt test pieces are placed in the test box 8 to be aged for 21 days, and a comparison test is carried out in the aging process.
Step S3: and after the ageing test is finished, taking out 18 asphalt test pieces after two groups of tests.
Step S4: and respectively testing penetration, ductility and viscosity of the two groups of asphalt test pieces after the aging test to obtain hardness and consistency conditions and plasticity conditions of the asphalt after ultraviolet aging and evaluate the ultraviolet aging resistance of the asphalt, and taking the penetration, ductility and viscosity as evaluation indexes to evaluate the ultraviolet aging resistance of the asphalt.
In this embodiment, in the step S2, the operation steps when the two groups of asphalt test pieces perform the comparative test in the aging process include: the method comprises the steps of keeping the test environment in an asphalt ultraviolet aging test area unchanged, installing a spraying assembly in an asphalt aging control test area, simulating rainfall on an asphalt test piece of the asphalt aging control test group by using the rainfall simulating environment of the spraying assembly, and repeating the step S3 and the step S4, wherein whether the influence of rain wash on the ultraviolet aging performance of asphalt is detected and compared under the same temperature and humidity and infrared irradiation conditions.
The spray assembly comprises a spray header 11, the spray header 11 is arranged on a movable rod 12 and is located above the sample tray 5, the movable rod 12 is arranged on the side wall of the test box body 8 through a mounting piece 23, the spray header 11 is connected with a circulating water supply device, the circulating water supply device is used for supplying water to the spray header 11, and the water is sprayed out from the spray header 11 and falls on a bitumen sample placed on the sample tray 5. The circulating water supply device comprises a water supply pump 14, the water supply pump 14 is connected with a control unit 19, a water inlet of the water supply pump 14 is communicated with a water tank 20, a water outlet of the water supply pump 14 is communicated with a spray header 11 through a water outlet pipeline 22, one end of the water outlet pipeline 22 is arranged on the inner side of a movable rod 12, a water flow meter 13 is arranged at the other end of the water outlet pipeline 22, and the water flow meter 13 is used for detecting the water flow in the water pipeline 22. The water tank 20 is communicated with a water collecting funnel 18 through a return pipeline, the water collecting funnel 18 is arranged below the bottom plate of the test box body 8, a drain hole 17 is formed in the bottom plate of the test box body 8, and the drain hole 17 corresponds to the water collecting funnel 18. The concrete implementation process of the structure is that the water supply pump 14 is powered to pump water in the water tank 20 and flows to the spray header 11 through the water outlet pipeline 22, and finally the water sprayed by the spray header 11 falls on an asphalt test piece placed on the right object carrying disc 6, so that the effect of simulating rainfall is achieved; the water falling into the test chamber flows into the water collecting funnel 18 through the water discharging hole 17, and the water in the water collecting funnel 18 flows back into the water tank 20 through the return pipe under the action of the water supply pump 14. A valve may be provided on the return line to control the on-off of the return line and prevent water in the tank 20 from flowing back.
Further, as shown in fig. 3 and 4, two movable bars 12 are provided in number, and the two movable bars 12 are connected by a connection block. The connecting block comprises an upper part 24-1 and a lower part 24-2, and the upper part 24-1 and the lower part 24-2 are rotationally connected through a rotating shaft 25; the water outlet pipe 22 is connected with the upper portion 24-1 and the lower portion 24-2 of the connection block, respectively, and the connection block has a hollow structure so that water in the water outlet pipe 22 passes through.
Example 2, an ultraviolet aging test method for asphalt with a control group, is different from example 1 in that: in the step S2, the operation steps when the two groups of asphalt test pieces are subjected to the comparative test in the aging process include: the test environment in the asphalt ultraviolet aging test area is kept unchanged, the filter glass 10 is installed above the inside of the asphalt aging control test area, specifically, the filter glass 10 is arranged on the upper right side of the partition board 4, one end of the filter glass 10 is erected on the top of the partition board 4, and the other end of the filter glass is detachably installed on the support rod 16 on the right side, so that the filter glass 10 can be conveniently removed and installed in the test process. The filter glass 10 was used to isolate ultraviolet rays emitted from the high-pressure mercury lamp 3 for test control. Then, in the test, the high-pressure mercury lamp 3 was turned on, and the steps S3 and S4 were repeated, and the test was conducted to compare the influence of the ultraviolet irradiation on the ultraviolet aging performance of the asphalt under the same thermal oxygen condition.
Other structures and test procedures were the same as in example 1.
Example 3, an ultraviolet aging test method for asphalt with a control group, was different from examples 1 and 2 in that: in the step S2, the operation steps when the two groups of asphalt test pieces are subjected to the comparative test in the aging process include: the distance between the two groups of carrying discs 6 and the high-pressure mercury lamp 3 is adjusted by rotating the nuts 21 under the two groups of carrying discs 6, wherein the distance between the asphalt test piece of the asphalt ultraviolet aging test group and the high-pressure mercury lamp 3 is adjusted to be 50-70 mm, and the distance between the asphalt test piece of the asphalt aging control test group and the high-pressure mercury lamp 3 is adjusted to be 80-100 mm. And then turning on the high-pressure mercury lamp 3, repeating the step S3 and the step S4, and comparing the influence of different ultraviolet irradiation heights on the ultraviolet ageing performance of the asphalt under the same temperature and humidity and infrared irradiation conditions.
Other structures and test procedures were the same as in example 1.
In the step S4, the penetration is physically tested according to ASTM D5 (ASTM 2013), the penetration test temperature is 25 ℃, and the three groups of asphalt test pieces tested by the three test methods in examples 1 to 3 are used for repeated tests, so that the average value of the three groups of data is finally obtained. Physical ductility testing was performed according to ASTM D113 (ASTM 2007) at a ductility test temperature of 15 ℃ and repeated tests were also performed using three groups of asphalt test pieces tested by the three test methods of examples 1-3, resulting in an average of the three groups of data. The viscosity physical test was performed according to ASTM D4402 (ASTM 2015 b) at a viscosity test temperature of 135 ℃ and repeated tests were also performed using the three groups of asphalt test pieces tested by the three test methods of examples 1-3, to finally obtain an average value of the three groups of data.
The evaluation method for evaluating the ultraviolet aging resistance of the asphalt comprises the following steps: selecting a residual penetration ratio (PRR) as an indicator characterizing the magnitude of penetration decay during ultraviolet aging of the asphalt; adopting a Ductility Retention Ratio (DRR) to represent an index of ductility attenuation amplitude in the ultraviolet aging process of the asphalt; viscosity Aging Index (VAI) was selected as an index for evaluating the degree of asphalt aging.
The penetration reflects the hardness and consistency of asphalt and can be used as a medium temperature index. To evaluate the ultraviolet aging resistance of the modified asphalt, the results before and after aging were compared. Thus, the residual penetration ratio (PRR) was chosen as an indicator of the magnitude of the penetration decay during asphalt aging. The residual penetration ratio is:
wherein: p 1 -before-aging penetration, P 2 -after-aging penetration, PRR-residual penetration ratio;
Ductility is an important index for evaluating asphalt plasticity, and can reflect the tensile property of asphalt materials. To evaluate the ultraviolet aging resistance of the modified asphalt, the ductility retention (DRR) was used to characterize the ductility attenuation amplitude of the asphalt during aging. The retention rate of ductility is:
Wherein: d 1 -the pre-aging ductility value, D 2 -the post-aging ductility value, DRR-the ductility retention;
As the asphalt aging process proceeds, the viscosity of the asphalt green sample increases, and in order to evaluate the ultraviolet aging resistance of the modified asphalt, a Viscosity Aging Index (VAI) is selected as an index for evaluating the degree of asphalt aging. The viscosity aging index is:
Wherein: eta 1 -pre-aging viscosity, eta 2 -post-aging viscosity, VAI-viscosity aging index.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (3)
1. A method for ultraviolet aging testing of asphalt with a control group, comprising the steps of:
Step S1: firstly, preparing a plurality of asphalt test pieces, and then equally dividing the prepared asphalt test pieces into two groups, wherein one group is an asphalt ultraviolet aging test group, and the other group is an asphalt aging control test group;
Step S2: respectively placing two groups of asphalt test pieces into corresponding test areas in a test box body (8), adjusting the distances between the two groups of asphalt test pieces and a high-pressure mercury lamp (3) in the test box body (8) to 50 mm-70 mm, adjusting a test environment through a temperature and humidity control assembly, then placing the two groups of asphalt test pieces in the test box body (8) for aging for 21 days, and carrying out a comparison test in the aging process;
step S3: after the ageing test is finished, taking out two groups of asphalt test pieces;
step S4: the penetration, ductility and viscosity of the two groups of asphalt test pieces after the aging test are respectively tested, and the penetration, ductility and viscosity are used as evaluation indexes to evaluate the ultraviolet aging resistance of asphalt;
The inside of the test box body (8) is divided into an asphalt ultraviolet aging test area and an asphalt aging control test area by a partition plate (4), a group of bearing components for placing asphalt test pieces are arranged in the asphalt ultraviolet aging test area and the asphalt aging control test area, the asphalt test pieces of the asphalt ultraviolet aging test group are placed on the bearing components in the asphalt ultraviolet aging test area, and the asphalt test pieces of the asphalt aging control test group are placed on the bearing components in the asphalt aging control test area; a high-pressure mercury lamp (3) matched with the two groups of asphalt test pieces is arranged above the inside of the test box body (8);
The bearing assembly comprises a carrying disc (6), the carrying disc (6) is connected with a threaded straight rod (7) through a nut (21), and the threaded straight rod (7) is vertically fixed on the bottom wall of the test box body (8); a plurality of sample trays (5) matched with the asphalt test pieces are arranged on the carrying disc (6);
In the step S2, the operation steps when the two groups of asphalt test pieces are subjected to the comparative test in the aging process include: keeping the test environment in the asphalt ultraviolet aging test area unchanged, installing a spraying assembly in the asphalt aging control test area, simulating rainfall on an asphalt test piece of the asphalt aging control test group by using the rainfall simulation environment of the spraying assembly, turning on a high-pressure mercury lamp (3) after spraying, repeating the step S3 and the step S4, and comparing whether the influence of rain wash on the ultraviolet aging performance of asphalt is caused under the same temperature and humidity;
In the step S2, the operation steps when the two groups of asphalt test pieces are subjected to the comparative test in the aging process include: the testing environment in the asphalt ultraviolet aging test area is kept unchanged, filter glass (10) is arranged above the inside of the asphalt aging control test area, and a high-pressure mercury lamp (3) is turned on; repeating the step S3 and the step S4, and comparing whether the ultraviolet irradiation has influence on the ultraviolet ageing performance of the asphalt under the same humidity and hot oxygen conditions or not;
In the step S2, the operation steps when the two groups of asphalt test pieces are subjected to the comparative test in the aging process include: adjusting the distance between an asphalt test piece of an asphalt ultraviolet aging test group and a high-pressure mercury lamp (3) to 50-70 mm, adjusting the distance between an asphalt test piece of an asphalt aging control test group and the high-pressure mercury lamp (3) to 80-100 mm, and turning on the high-pressure mercury lamp (3); repeating the step S3 and the step S4, and comparing the influence of different ultraviolet irradiation heights on the ultraviolet ageing performance of the asphalt under the same temperature and humidity conditions through a test;
The spray assembly comprises a spray header (11), the spray header (11) is arranged on a movable rod (12) and is positioned above the sample tray (5), the movable rod (12) is arranged on the side wall of the test box body (8) through a mounting piece (23), and the spray header (11) is connected with a circulating water supply device; the circulating water supply device comprises a water supply pump (14), the water supply pump (14) is connected with a control unit (19), a water inlet of the water supply pump (14) is communicated with a water tank (20), a water outlet of the water supply pump (14) is communicated with a spray header (11) through a water outlet pipeline (22), one end of the water outlet pipeline (22) is arranged on the inner side of a movable rod (12), and a water flow meter (13) is arranged at the other end of the water outlet pipeline (22); the water tank (20) is communicated with the water collecting funnel (18) through a return pipeline, the water collecting funnel (18) is arranged below the bottom plate of the test box body (8), the bottom plate of the test box body (8) is provided with a drain hole (17), and the drain hole (17) corresponds to the water collecting funnel (18);
The number of the movable rods (12) is two, and the two movable rods (12) are connected through a connecting block; the connecting block is of a hollow structure and comprises an upper part (24-1) and a lower part (24-2), and the upper part (24-1) and the lower part (24-2) are rotationally connected through a rotating shaft (25); the water outlet pipeline (22) is respectively connected with the upper part (24-1) and the lower part (24-2) of the connecting block.
2. The ultraviolet aging test method for asphalt with the control group according to claim 1, wherein the temperature and humidity control assembly comprises a temperature and humidity sensor (15), the temperature and humidity sensor (15) is arranged on a partition board (4), an exhaust fan (9) is further arranged on the partition board (4), the exhaust fan (9) is connected with a power assembly (1), the power assembly (1) is arranged on the outer side of the top wall of a test box body (8), and the temperature and humidity sensor (15) and the power assembly (1) are both connected with a control unit (19); two ventilation openings (2) are formed in the top wall of the test box body (8), and the two ventilation openings (2) are respectively corresponding to the asphalt ultraviolet aging test area and the asphalt aging control test area.
3. The method for ultraviolet aging of asphalt with a control group according to claim 1 or 2, wherein the residual penetration ratio is selected as an index for characterizing the degree of attenuation of penetration during ultraviolet aging of asphalt; adopting a ductility retention rate to represent an index of ductility attenuation amplitude in the ultraviolet aging process of the asphalt; selecting a viscosity ageing index as an index for evaluating the ageing degree of asphalt;
Wherein: the residual penetration ratio is:
（1）
wherein: p 1 -before-aging penetration, P 2 -after-aging penetration, PRR-residual penetration ratio;
The retention rate of ductility is:
（2）
Wherein: d 1 -the pre-aging ductility value, D 2 -the post-aging ductility value, DRR-the ductility retention;
the viscosity aging index is:
（3）
Wherein: eta 1 -pre-aging viscosity, eta 2 -post-aging viscosity, VAI-viscosity aging index.
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