CN113109241A - Asphalt accelerated aging test device for simulating all-weather multi-environment coupling effect - Google Patents
Asphalt accelerated aging test device for simulating all-weather multi-environment coupling effect Download PDFInfo
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- CN113109241A CN113109241A CN202110304511.2A CN202110304511A CN113109241A CN 113109241 A CN113109241 A CN 113109241A CN 202110304511 A CN202110304511 A CN 202110304511A CN 113109241 A CN113109241 A CN 113109241A
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- 238000012360 testing method Methods 0.000 title claims abstract description 87
- 230000032683 aging Effects 0.000 title claims abstract description 75
- 239000010426 asphalt Substances 0.000 title claims abstract description 53
- 230000001808 coupling effect Effects 0.000 title claims abstract description 10
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 60
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000007789 gas Substances 0.000 claims abstract description 33
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000001301 oxygen Substances 0.000 claims abstract description 26
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 230000007613 environmental effect Effects 0.000 claims abstract description 7
- 239000007921 spray Substances 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 238000002474 experimental method Methods 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 238000003786 synthesis reaction Methods 0.000 claims description 3
- 239000002912 waste gas Substances 0.000 claims description 3
- 239000011230 binding agent Substances 0.000 abstract description 6
- 238000004088 simulation Methods 0.000 abstract description 6
- 230000007774 longterm Effects 0.000 abstract description 5
- 239000004744 fabric Substances 0.000 abstract description 3
- 230000003647 oxidation Effects 0.000 description 7
- 238000007254 oxidation reaction Methods 0.000 description 7
- 230000001590 oxidative effect Effects 0.000 description 7
- 230000009471 action Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 230000003679 aging effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003642 reactive oxygen metabolite Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 239000012615 aggregate Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000006552 photochemical reaction Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Classifications
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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
Abstract
The invention discloses an asphalt accelerated aging test device for simulating all-weather multi-environment coupling effect, which comprises: synthetic air bottle, pressure regulator, flow valve, ozone generator, beaker, heatable magnetic stirrers, admission valve, display screen, control panel, spray set, observation window, little proof box, air outlet valve, exhaust hood, internal pipeline, ultraviolet irradiation device, water pipe, sample frame, little proof box admission valve, little proof box air outlet valve, screen cloth. The gas factors are utilized to accelerate the long-term thermal-oxidative aging of the simulated asphalt binder and accelerate the aging process of the asphalt binder, and trace active oxygen existing in reality is added in a high-concentration form. The device can reflect the influence of environmental factors such as temperature, ultraviolet rays, rainfall, oxygen, ozone, nitrogen oxides and the like in the nature at the same time, so that the accurate simulation of the asphalt aging behavior under all weather conditions is realized, and the indoor test result of the device is more in line with the service condition of the actual asphalt pavement.
Description
Technical Field
The invention relates to an asphalt accelerated aging test device for simulating all-weather multi-environment coupling effect, belonging to the technical field of asphalt performance test.
Background
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, and finally, the durability of the asphalt pavement is reduced and the service life of the asphalt pavement is shortened.
The road asphalt aging test methods can be generally divided into two types: the method comprises the following steps of firstly, a natural aging method, namely, researching the change of the composition, structure and property of the asphalt along with time in the aging process by means of the aging effect of natural environment on the asphalt, and evaluating the aging performance of the asphalt; the other is accelerated simulated aging, namely forced aging is carried out on the asphalt in a laboratory, the aging condition is generally more severe than the external action, and a large amount of data can be obtained in a short time. Currently, two standard methods are available in the laboratory at the asphalt binder level, namely the rotating film oven test (RTFOT) to simulate short-term aging and the pressure aging test (PAV) to simulate long-term aging. Although RTFOT can be used in the laboratory to simulate the short term in-situ aging of asphalt due to the combined action of heat and oxygen during blending, compaction and paving, there is controversy as to whether PAV can truly simulate the long term oxidative aging of asphalt pavement during use, since the high pressure and temperature during PAV testing can produce some chemical reactions that do not really occur in the field. Whereas long-term oxidative aging is driven by slow oxidation, especially oxidation of the upper pavement layer by atmospheric oxygen and other highly oxidizing gases (e.g., ozone, nitrogen oxides). Asphalt acts as an organic cementitious material when exposed to active oxygen (O)XAnd NOXX ═ 1-3) is easily oxidized. Exhaust gases from engines release a small amount of nitrogen oxides which, when subjected to photochemical reactions in the sun, promote the formation of ozone. Ozone and nitrogen oxides react with the pavement causing the binder to age.
Therefore, it is necessary to develop an asphalt accelerated aging simulation device capable of accelerating the simulation of all-weather service state, so as to deeply research the aging process and mechanism of asphalt under all-weather coupling action, which is of great significance for realizing accurate prediction of asphalt pavement aging behavior and development of long-life asphalt pavement.
Disclosure of Invention
The invention aims to provide an all-weather service asphalt accelerated aging test device which can simultaneously simulate the influence of single factor and multi-factor coupling on asphalt performance. The long-term thermal oxidative aging of simulated asphalt binders is accelerated by gas factors, which are mainly trace amounts of reactive oxygen species that are actually present in reality. To increase the oxidation rate and accelerate the aging process of the asphalt binder, reactive oxygen species present in a realistic trace amount are added in a high concentration, but the temperature and pressure are maintained at a realistic level. The device can reflect the influence of environmental factors such as temperature, ultraviolet rays, rainfall, oxygen, ozone, nitrogen oxides and the like in the nature at the same time, so that the accurate simulation of the asphalt aging behavior under all weather conditions is realized, and the indoor test result of the device is more in line with the service condition of the actual asphalt pavement. Meanwhile, ozone is used as a strong oxidant gas to play a role in accelerating aging.
The invention relates to an all-weather service state asphalt comprehensive aging test device, which comprises: synthetic air bottle (1), pressure regulator (2), flow valve (3), ozone generator (4), beaker (5), heatable magnetic stirrers (6), admission valve (7), display screen (8), control panel (9), spray set (10), observation window (11), little test box (12), air outlet valve (13), exhaust hood (14), internal pipeline (15), ultraviolet irradiation device (16), water pipe (17), sample frame (18), little test box admission valve (19-22), little test box air outlet valve (23), screen cloth (24).
Overall device diagram: 79 percent of nitrogen and 21 percent of oxygen are contained in a synthetic air bottle (1), a pressure regulator (2) is used for controlling the air pressure at the outlet of the air bottle, a flow valve (3) is used for controlling the air flow rate entering an ozone generator (4), the air can generate ozone and nitrogen oxide after passing through the ozone generator (4), a beaker (5) and a heatable magnetic stirrer (6) are combined into a gas heating device to play a role of heating gas, the heated gas enters a box body through an air inlet valve (7) and enters a small test box (12) through an internal pipeline (15), the small test box (12) is provided with four air inlet valves (19-22) and an air outlet valve (23), a screen (24) is used for placing a sample, and gas flows through the exhaust hood (14) through the air outlet valve (13) after coming out of the air outlet valve (23) of the small test box to be treated.
The small test chamber (12) is placed on the sample holder (18) and comprises four air inlet valves (19-22) and one air outlet valve (23), the box body has enough air tightness, the upper part of the inner screen (24) can be used for placing the asphalt Marshall sample, so that the air can fully flow through the inside of the sample, and the air flows out from the small test chamber air outlet valve (23).
The outside display screen (8), control panel (9) and observation window (11) of being equipped with of big proof box, temperature, humidity, ultraviolet irradiation intensity, the volume of spraying when control panel (9) control test, inside contains ultraviolet irradiation device (16), water pipe (17), spray set (10) and little proof box (12).
When in test, a sample is firstly placed in a small test box (12) to be subjected to thermo-oxidative ageing treatment, wherein oxygen comprises ozone, oxygen and nitrogen oxides, the sample subjected to thermo-oxidative ageing is taken out of the small test box (12), the small test box (12) and the internal pipeline (15) are taken out of the test box, and then the sample subjected to thermo-oxidative ageing is placed on a sample rack (18) to be subjected to ultraviolet ageing and water ageing tests.
The implementation process of the device is as follows: the temperature and humidity conditions in the generating box are adjusted through a control panel (9), firstly, required asphalt samples are placed in a small test box (12) according to experiment requirements, then, air in an air synthesis bottle (1) is prepared into ozone and nitric oxide by using a corona method in an ozone generator (4), the prepared air is heated by a beaker (5) and a heatable magnetic stirrer (6) and then conveyed into the test box, enters the small test box (12) through an internal pipeline (15), and finally, the air is discharged through an air outlet valve (13) and is treated through an air exhaust hood (14). The samples after thermo-oxidative ageing are taken out from the small test box (12), wherein oxygen comprises ozone, oxygen and nitrogen oxides, the small test box (12) and the internal pipeline (15) are taken out from the test box, then the samples after thermo-oxidative ageing are placed on a sample rack (18), an ultraviolet irradiation device (16) simulates ultraviolet ageing under all-weather conditions, and a spraying device (10) simulates water ageing under all-weather conditions. The display screen (8) can monitor environmental data in the test chamber, and the observation window (11) can observe the condition of a sample in the test chamber.
Compared with the prior art, the invention can obtain the following beneficial effects: 1. the influence on the performance of the asphalt under the combined action of the influence of environmental factors such as temperature, ultraviolet rays, rainfall, oxygen, ozone, nitrogen oxides and the like in the nature can be simultaneously considered, and the aging simulation of the asphalt by the action of single factor is also realized, so that the applicability is wider. 2. During the test, the temperature and pressure were always at a more realistic level. 3. The addition of a trace amount of active oxygen (ozone and nitrogen oxide) which is actually present in a high concentration accelerates the aging of asphalt, and a large amount of data can be obtained in a short time. 4. Parts of each part can be detached, substitutes can be found easily on the market, the using economy of the device is improved, materials with higher cost performance are used, and the using cost is effectively reduced. 5. The gas heating device (5-6) heats the gas in advance, so that the gas is prevented from flowing out of the test box when the temperature of the gas does not reach the test temperature, and the aging speed is reduced. 6. The device has the advantages that waste gas treatment measures are taken, the pollution to the environment is reduced to the maximum extent, and the device is an environment-friendly device. 7. Thermal oxidation aging, ultraviolet light and water aging are carried out step by step, and the problem that the aging effect cannot be achieved due to the fact that ozone is dissolved in water and the effect between the ozone and the ultraviolet light is effectively solved. 8. The box and the pipe inside the instrument have the performances of high temperature resistance, oxidation resistance and salt and alkali resistance, can use other oxidizing gases and liquids with different PH values to carry out aging experiments, and have multiple functions. 9. The test box is easy to manufacture, simple to operate, safe and reliable.
Drawings
FIG. 1 is an overall view of the apparatus.
FIG. 2 is a cross-sectional view of the housing.
Fig. 3 is a three-dimensional view of an internal small test chamber.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
The invention relates to an all-weather service state asphalt comprehensive aging test device, which comprises the following components as shown in figures 1 and 2: synthetic air bottle (1), pressure regulator (2), flow valve (3), ozone generator (4), beaker (5), heatable magnetic stirrers (6), admission valve (7), display screen (8), control panel (9), spray set (10), observation window (11), little test box (12), air outlet valve (13), exhaust hood (14), internal pipeline (15), ultraviolet irradiation device (16), water pipe (17), sample frame (18), little test box admission valve (19-22), little test box air outlet valve (23), screen cloth (24).
Overall device diagram: 79 percent of nitrogen and 21 percent of oxygen are contained in a synthetic air bottle (1), a pressure regulator (2) is used for controlling the air pressure at the outlet of the air bottle, a flow valve (3) is used for controlling the air flow rate entering an ozone generator (4), the air can generate ozone and nitrogen oxide after passing through the ozone generator (4), a beaker (5) and a heatable magnetic stirrer (6) are combined into a gas heating device to play a role of heating gas, the heated gas enters a box body through an air inlet valve (7) and enters a small test box (12) through an internal pipeline (15), the small test box (12) is provided with four air inlet valves (19-22) and an air outlet valve (23), a screen (24) is used for placing a sample, and gas flows through the exhaust hood (14) through the air outlet valve (13) after coming out of the air outlet valve (23) of the small test box to be treated.
Three-dimensional diagram of internal small test box: the small test chamber (12) is placed on the sample holder (18) and comprises four air inlet valves (19-22) and one air outlet valve (23), the box body has enough air tightness, the upper part of the inner screen (24) can be used for placing the asphalt Marshall sample, so that the air can fully flow through the inside of the sample, and the air flows out from the small test chamber air outlet valve (23).
Display screen (8), control panel (9) and observation window (11) can be seen to big proof box outside, and temperature, humidity, ultraviolet irradiation intensity, the volume of spraying when control panel (9) can control the experiment contain ultraviolet irradiation device (16), water pipe (17), spray set (10) and little proof box (12) inside.
When in test, a sample is firstly placed in a small test box (12) to be subjected to thermo-oxidative ageing treatment, wherein oxygen comprises ozone, oxygen and nitrogen oxides, the sample subjected to thermo-oxidative ageing is taken out of the small test box (12), the small test box (12) and the internal pipeline (15) are taken out of the test box, and then the sample subjected to thermo-oxidative ageing is placed on a sample rack (18) to be subjected to ultraviolet ageing and water ageing tests.
The implementation process of the device is as follows: the temperature and humidity conditions in the generating box are adjusted through a control panel (9), firstly, required asphalt samples are placed in a small test box (12) according to experiment requirements, then, air in an air synthesis bottle (1) is prepared into ozone and nitric oxide by using a corona method in an ozone generator (4), the prepared air is heated by a beaker (5) and a heatable magnetic stirrer (6) and then conveyed into the test box, enters the small test box (12) through an internal pipeline (15), and finally, the air is discharged through an air outlet valve (13) and is treated through an air exhaust hood (14). The samples after thermo-oxidative ageing are taken out from the small test box (12), wherein oxygen comprises ozone, oxygen and nitrogen oxides, the small test box (12) and the internal pipeline (15) are taken out from the test box, then the samples after thermo-oxidative ageing are placed on a sample rack (18), an ultraviolet irradiation device (16) simulates ultraviolet ageing under all-weather conditions, and a spraying device (10) simulates water ageing under all-weather conditions. The display screen (8) can monitor environmental data in the test chamber, and the observation window (11) can observe the condition of a sample in the test chamber.
The invention can simultaneously consider the influence of environmental factors such as temperature, ultraviolet rays, rainfall, oxygen, ozone, nitrogen oxides and the like in the nature on the performance of the asphalt, has single factor function on the aging simulation of the asphalt, and has wider applicability. During the test, the temperature and pressure were always at a more realistic level. The addition of a trace amount of active oxygen (ozone and nitrogen oxide) which is actually present in a high concentration accelerates the aging of asphalt, and a large amount of data can be obtained in a short time. Parts of each part can be detached, substitutes can be found easily on the market, the using economy of the device is improved, materials with higher cost performance are used, and the using cost is effectively reduced. The gas heating device (5-6) heats the gas in advance, so that the gas is prevented from flowing out of the test box when the temperature of the gas does not reach the test temperature, and the aging speed is reduced. The device has the advantages that waste gas treatment measures are taken, the pollution to the environment is reduced to the maximum extent, and the device is an environment-friendly device. Thermal oxidation aging, ultraviolet light and water aging are carried out step by step, and the problem that the aging effect cannot be achieved due to the fact that ozone is dissolved in water and the effect between the ozone and the ultraviolet light is effectively solved. The box and the pipe inside the instrument have the performances of high temperature resistance, oxidation resistance and salt and alkali resistance, can use other oxidizing gases and liquids with different PH values to carry out aging experiments, and have multiple functions. The test box is easy to manufacture, simple to operate, safe and reliable.
Claims (5)
1. The asphalt accelerated aging test device for simulating all-weather multi-environment coupling effect is characterized in that: the synthetic air bottle (1) contains 79% of nitrogen and 21% of oxygen, the pressure regulator (2) is used for controlling air pressure at an outlet of the air bottle, the flow valve (3) is used for controlling air flow rate entering the ozone generator (4), the air can generate ozone and nitrogen oxides after passing through the ozone generator (4), the beaker (5) and the heatable magnetic stirrer (6) are combined into a gas heating device to play a role of heating gas, the heated gas enters the box body through the air inlet valve (7) and enters the small test box (12) through the internal pipeline (15), the small test box (12) is provided with four air inlet valves and one air outlet valve (23), the screen (24) is used for placing a sample, and the gas flows through the exhaust hood (14) through the air outlet valve (13) after coming out of the air outlet valve (23) of the small test box to perform waste gas treatment.
2. The apparatus of claim 1 for simulating all-weather multi-environment coupling effect accelerated asphalt aging, wherein: the chamber (12) is placed on the sample holder (18) and includes four inlet valves and one outlet valve (23), the chamber is sufficiently airtight, and the upper portion of the inner screen (24) is used to place the asphalt marshall test sample so that the gas flows through the interior of the sample sufficiently and flows out of the chamber outlet valve (23).
3. The apparatus of claim 1 for simulating all-weather multi-environment coupling effect accelerated asphalt aging, wherein: the outside display screen (8), control panel (9) and observation window (11) of being equipped with of big proof box, temperature, humidity, ultraviolet irradiation intensity, the volume of spraying when control panel (9) control test, inside contains ultraviolet irradiation device (16), water pipe (17), spray set (10) and little proof box (12).
4. The apparatus of claim 1 for simulating all-weather multi-environment coupling effect accelerated asphalt aging, wherein: when in test, a sample is firstly placed in a small test box (12) to be subjected to thermo-oxidative ageing treatment, wherein oxygen comprises ozone, oxygen and nitrogen oxides, the sample subjected to thermo-oxidative ageing is taken out of the small test box (12), the small test box (12) and the internal pipeline (15) are taken out of the test box, and then the sample subjected to thermo-oxidative ageing is placed on a sample rack (18) to be subjected to ultraviolet ageing and water ageing tests.
5. The apparatus of claim 1 for simulating all-weather multi-environment coupling effect accelerated asphalt aging, wherein: the implementation process of the device is as follows: the temperature and humidity conditions in the generating box are adjusted through a control panel (9), firstly, required asphalt samples are placed in a small test box (12) according to experiment requirements, then, air in an air synthesis bottle (1) is prepared into ozone and nitric oxide in an ozone generator (4) by using a corona method, the prepared gas is heated through a beaker (5) and a heatable magnetic stirrer (6) and then conveyed into the test box, enters the small test box (12) through an internal pipeline (15), and finally, the gas is discharged through a gas outlet valve (13) and is treated through a gas exhaust hood (14); taking the sample subjected to thermal-oxidative aging out of the small test box (12), wherein oxygen comprises ozone, oxygen and nitrogen oxides, taking the small test box (12) and the internal pipeline (15) out of the test box, placing the sample subjected to thermal-oxidative aging on a sample rack (18), simulating ultraviolet aging under all-weather conditions by using an ultraviolet irradiation device (16), and simulating water aging under all-weather conditions by using a spraying device (10); the display screen (8) can monitor environmental data in the test chamber, and the observation window (11) can observe the condition of a sample in the test chamber.
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| CN202110304511.2A CN113109241A (en) | 2021-03-22 | 2021-03-22 | Asphalt accelerated aging test device for simulating all-weather multi-environment coupling effect |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114018795A (en) * | 2021-11-05 | 2022-02-08 | 国网四川省电力公司电力科学研究院 | SF6 density relay shockproof oil aging test box and test method |
| CN114324129A (en) * | 2021-12-10 | 2022-04-12 | 国网内蒙古东部电力有限公司电力科学研究院 | Aging simulation device for high-voltage bushing insulating material |
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