CN113105669A - Asphalt anti-aging agent for roads and use method thereof - Google Patents
Asphalt anti-aging agent for roads and use method thereof Download PDFInfo
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- CN113105669A CN113105669A CN202110391771.8A CN202110391771A CN113105669A CN 113105669 A CN113105669 A CN 113105669A CN 202110391771 A CN202110391771 A CN 202110391771A CN 113105669 A CN113105669 A CN 113105669A
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- asphalt
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
- C08K5/005—Stabilisers against oxidation, heat, light, ozone
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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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
- Y02A30/60—Planning or developing urban green infrastructure
Abstract
The invention discloses a road asphalt anti-aging agent and a use method thereof, wherein the road asphalt anti-aging agent comprises an anti-aging agent, an antioxidant and a light stabilizer; the anti-aging agent is a nickel-containing compound and is dark green in color; the antioxidant is an amine compound and is white; the light stabilizer is a hindered amine substance and is white in color. The raw materials required by the invention have the characteristics of low carbon, environmental protection, wide sources, low market price and the like, the preparation process of the composite anti-aging agent is simple, the experimental conditions are mild, large-scale preparation instruments are not required, and the industrialization is easy to realize. In addition, a large number of researches prove that the obtained composite anti-aging agent has small influence on original asphalt and can effectively resist the influence of long-term aging on the asphalt, the added anti-aging agent and antioxidant can effectively resist the influence of high temperature, oxygen, ozone and the like on the asphalt, and the light stabilizer is also favorable for improving the ultraviolet light aging resistance of the asphalt.
Description
Technical Field
The invention mainly relates to an anti-aging agent for road asphalt and a using method thereof, belonging to the technical field of road petroleum asphalt.
Background
In the service process of the asphalt pavement, the asphalt pavement is exposed to complex environments such as high temperature, illumination, oxygen, ultraviolet rays, rainwater and the like for a long time and is influenced by natural environment, and diseases such as cracking, rutting, loosening, pit grooves and the like are easily caused, wherein the asphalt serving as a main cementing material for bonding coarse and fine aggregates, mineral powder and additives can generate irreversible chemical change, the generation and development of road diseases are greatly accelerated, the service performance and the service life of the asphalt pavement are reduced, and the great challenge is brought to the maintenance of the pavement, so that the improvement of the anti-aging performance of the pavement is beneficial to the development of the long-life asphalt pavement.
For the reason of the property change of the asphalt after aging, the current research makes explanation from the microscopic view of chemical composition and the like: under the conditions of high temperature, oxygen, ultraviolet illumination and the like, physical changes such as thermal evaporation of light components and the like and a series of chemical reactions such as addition, polymerization, oxidative dehydrogenation and the like of short-chain compounds occur, so that cyclic compounds and polar functional groups with complex structures are generated, the molecular weight of the asphalt is increased, the light components such as aromatic components are converted into heavy components such as asphaltene, the asphalt is further hardened and aged, the macroscopic performances of the asphalt include that the penetration degree and ductility are reduced, the softening point and viscosity are increased, the rheological indexes such as complex modulus, zero shear viscosity, fatigue factors, rutting factors and the like are increased along with the increase of the aging degree of the asphalt, and the unrecoverable creep flexibility and phase angle are reduced.
In order to alleviate the influence of asphalt aging on asphalt pavement, special measures are used for resisting the asphalt pavement aging, such as improving the asphalt production mode through oxidation, distillation and the like, and increasing a pavement wearing layer, a physical isolation layer and the like. The main research direction focuses on the research of anti-aging materials, but different material types, mixing amounts and use conditions have obvious influence on the action effect, the anti-aging agent has single action effect, and all-weather multifunctional anti-aging technologies capable of resisting ultraviolet, high temperature, oxygen, ozone, rainwater and the like do not exist. For example, the layered double hydroxide has a high ultraviolet reflectivity, can improve the ultraviolet aging resistance of the asphalt, but has poor compatibility with the asphalt, and cannot be uniformly and stably dispersed in the asphalt. Part of the antioxidants have good antioxidant effect on resin materials, but do not obviously improve the ultraviolet aging resistance of the asphalt. Although the ultraviolet absorbers are of various types, the ultraviolet absorbers have large influence difference on various performances of the asphalt, and only part of the ultraviolet absorbers can better enhance the ultraviolet light aging resistance of the asphalt.
Based on the analysis, aiming at the aging effect characteristics of the asphalt, the development of a multifunctional, low-cost and high-performance environment-friendly asphalt anti-aging agent product is still the development direction in the future.
Disclosure of Invention
The invention aims to provide a high-performance composite asphalt anti-aging agent, and the anti-aging asphalt prepared by the high-performance composite asphalt anti-aging agent is used for reducing the performance decline of asphalt in the aging process, slowing the aging speed of the asphalt and relieving the generation and development of road diseases.
In order to achieve the aim, the anti-aging agent is prepared by compounding the following raw materials in parts by weight (relative to the mass of asphalt).
An anti-aging agent: 1 to 10 percent
Antioxidant: 0.5 to 8 percent
Light stabilizer: 0.1 to 3 percent
The anti-aging agent is a nickel-containing compound and is dark green in color; the antioxidant is an amine compound and is white; the light stabilizer is a hindered amine substance and is white in color.
The preparation and use modes of the anti-aging agent are as follows:
firstly, respectively crushing the anti-aging agent, the antioxidant and the light stabilizer into powder in a mortar, then weighing the powdery anti-aging agent, the antioxidant and the light stabilizer into a container according to the weight of the composite asphalt anti-aging agent, and manually stirring for 20min to fully mix the powdery anti-aging agent, the antioxidant and the light stabilizer to prepare the composite asphalt anti-aging agent.
The invention is mainly used for improving the ageing resistance of asphalt materials and needs to be matched with asphalt for use. The preparation method of the anti-aging asphalt comprises the following steps: heating original asphalt in an oven at 135 +/-5 ℃ to a flowing state, then moving the asphalt into a constant-temperature oil bath kettle at 140 +/-5 ℃ and slowly adding the prepared composite anti-aging agent, manually stirring the mixture for 10min at the rotating speed of about 60r/min by using a glass rod to uniformly dissolve the anti-aging agent into the asphalt, then stirring the mixture for 45min at the rotating speed of 2000r/min by using a high-torque electric stirrer, and finally manually stirring the mixture for 10min at the rotating speed of about 60r/min by using the glass rod to remove bubbles in the anti-aging asphalt, thus preparing the anti-aging asphalt sample.
The raw materials required by the invention have the characteristics of low carbon, environmental protection, wide sources, low market price and the like, the preparation process of the composite anti-aging agent is simple, the experimental conditions are mild, large-scale preparation instruments are not required, and the industrialization is easy to realize. In addition, a large number of researches prove that the obtained composite anti-aging agent has small influence on original asphalt and can effectively resist the influence of long-term aging on the asphalt, the added anti-aging agent and antioxidant can effectively resist the influence of high temperature, oxygen, ozone and the like on the asphalt, and the light stabilizer is also favorable for improving the ultraviolet light aging resistance of the asphalt.
Drawings
FIG. 1 is a composite age resister product;
FIG. 2 is a complex modulus main curve and a rutting factor variation curve with temperature after aging of anti-aging asphalt added with four anti-aging agents with the addition amount of 1%, 3%, 5% and 7%;
FIG. 3 is a complex modulus main curve and a rutting factor variation curve with temperature when the anti-aging asphalt added with 1%, 3%, 5% and 7% of four antioxidants is not aged, (a) the complex modulus main curve (b) is a rutting factor variation curve with temperature;
FIG. 4 is a complex modulus main curve and a rutting factor variation curve with temperature of anti-aging asphalt added with 0.5%, 1% of light stabilizer and 1% and 3% of light shielding agent after ultraviolet aging, (a) the complex modulus main curve (b) is a rutting factor variation curve with temperature;
FIG. 5 shows the multi-stress creep test results of the anti-aging asphalt with the composite anti-aging agent.
Detailed Description
The following examples are given to further illustrate the technical aspects of the present invention, but the present invention is not limited to the following examples.
The first embodiment is as follows:
four anti-aging agents with the mixing amount of 1%, 3%, 5% and 7% are respectively added into the original asphalt. Take the anti-aging agent needed for improving the anti-aging performance of 500g of original asphalt as an example.
The preparation method comprises the following steps:
firstly, pulverizing the anti-aging agent into powder in a mortar, and then weighing 5g, 15g, 25g and 35g of the anti-aging agent into a container to obtain the asphalt anti-aging agent. The anti-aging agent is mainly used for improving the anti-aging performance of asphalt materials and needs to be matched with asphalt for use. Heating original asphalt in an oven at 135 +/-5 ℃ to a flowing state, then moving the asphalt into a constant-temperature oil bath kettle at 140 +/-5 ℃ and slowly adding an anti-aging agent, manually stirring the asphalt at the rotating speed of about 60r/min by using a glass rod for 10min to uniformly dissolve the anti-aging agent into the asphalt, then stirring the asphalt at the rotating speed of 2000r/min by using a high-torque electric stirrer for 45min, and finally manually stirring the asphalt at the rotating speed of about 60r/min by using the glass rod for 10min to remove bubbles in the anti-aging asphalt, thus preparing the anti-aging asphalt sample.
And then, respectively carrying out short-term aging and long-term aging on the matrix asphalt and the anti-aging asphalt with different mixing amounts according to ASTM D2872 and ASTM D6521 standards, and comparing the change conditions of the complex modulus and the rutting factor in the aging process through a DSR frequency scanning experiment and a temperature scanning experiment to evaluate the anti-aging effect of the anti-aging agent with different mixing amounts so as to determine the mixing amount of the anti-aging agent.
Example two:
adding 1%, 3%, 5% and 7% of antioxidant into original asphalt, taking antioxidant required for improving the ageing resistance of 500g of original asphalt as an example.
The preparation method is the same as the first embodiment.
And then comparing the change conditions of the complex modulus and the rutting factor in different types of unaged asphalt by a DSR frequency scanning experiment and a temperature scanning experiment to evaluate the influence of different antioxidant doping amounts on the original asphalt so as to determine the antioxidant doping amount.
Example three:
0.5% and 1% of a light stabilizer and 1% and 3% of a light shielding agent were added to the as-received asphalt, respectively, and an anti-aging agent required for improving the anti-aging performance of 500g of the as-received asphalt was exemplified.
The preparation method is the same as the first embodiment.
Then ultraviolet aging is carried out by adopting the following conditions: the light source is 6 UVA-340 ultraviolet lamp tubes which are tiled on the top of the device. Subjecting the original asphalt, the light shielding agent modified asphalt and the light stabilizer modified asphalt after being subjected to RTFOT aging to ultraviolet aging, wherein the thickness of the film of the asphalt sample is 0.8mm, the aging temperature is set to be 60 ℃, and the illumination intensity is 5.0W/M2The aging time was 200 hours. And comparing the change conditions of the complex modulus and the rutting factor in the aging process through a DSR frequency scanning experiment and a temperature scanning experiment to evaluate the aging effect of the aging inhibitors with different doping amounts, and further determining the doping amount and the type of the aging inhibitors.
Example four:
taking the composite anti-aging agent required for improving the anti-aging performance of 500g of original asphalt as an example, the raw materials and the weight parts of the raw materials are as follows:
an anti-aging agent: 15.00g
Antioxidant: 14.25g
Light stabilizer: 2.50g
The preparation method comprises the following steps:
firstly, respectively crushing the anti-aging agent, the antioxidant and the light stabilizer into powder in a mortar, then weighing the powdery anti-aging agent, the antioxidant and the light stabilizer into a container according to the weight of the composite asphalt anti-aging agent, and manually stirring for 20min to fully mix the powdery anti-aging agent, the antioxidant and the light stabilizer to prepare the composite asphalt anti-aging agent.
The anti-aging agent is mainly used for improving the anti-aging performance of asphalt materials and needs to be matched with asphalt for use. Heating original asphalt in an oven at 135 +/-5 ℃ to a flowing state, then moving the asphalt into a constant-temperature oil bath kettle at 140 +/-5 ℃ and slowly adding the prepared composite anti-aging agent, manually stirring the mixture for 10min at the rotating speed of about 60r/min by using a glass rod to uniformly dissolve the anti-aging agent into the asphalt, then stirring the mixture for 45min at the rotating speed of 2000r/min by using a high-torque electric stirrer, and finally manually stirring the mixture for 10min at the rotating speed of about 60r/min by using the glass rod to remove bubbles in the anti-aging asphalt, thus preparing the anti-aging asphalt sample.
Example five:
taking the composite anti-aging agent required for improving the anti-aging performance of 500g of original asphalt as an example, the raw materials and the weight parts of the raw materials are as follows:
an anti-aging agent: 17.10g
Antioxidant: 11.85g
Light stabilizer: 0.55g
The procedure was the same as in example four.
Example six:
taking the composite anti-aging agent required for improving the anti-aging performance of 500g of original asphalt as an example, the raw materials and the weight parts of the raw materials are as follows:
an anti-aging agent: 17.10g
Antioxidant: 3.15g
Light stabilizer: 1.95g
The procedure was the same as in example four.
Example seven:
taking the composite anti-aging agent required for improving the anti-aging performance of 500g of original asphalt as an example, the raw materials and the weight parts of the raw materials are as follows:
an anti-aging agent: 25.00g
Antioxidant: 7.50g
Light stabilizer: 1.25g
The procedure was the same as in example four.
Example eight:
taking the composite anti-aging agent required for improving the anti-aging performance of 500g of original asphalt as an example, the raw materials and the weight parts of the raw materials are as follows:
an anti-aging agent: 35.00g
Antioxidant: 20.00g
Light stabilizer: 7.50g
The procedure was the same as in example four.
In order to determine the optimal mixture ratio of different raw materials, the inventor conducts a great deal of experimental research. The experimental results are as follows:
as shown in FIG. 2, the anti-aging effect is obviously enhanced with the increase of the addition amount of the anti-aging agent. From the curve of the rutting factor changing along with the temperature, it can be found that when the mixing amount is increased from 1% to 3% and then from 3% to 5%, the rutting factor is greatly reduced, namely, the anti-aging effect has obvious and similar increase amplitude, the increase amplitude when the mixing amount is increased from 3% to 5% is relatively larger, and when the mixing amount is increased from 5% to 7%, the rutting factor is still reduced to a certain extent, which indicates that the mixing amount of the anti-aging agent can be still increased. From the complex modulus main curve, the expression of the law is more obvious, when the addition amount of the anti-aging agent is increased from 3% to 7%, the complex modulus is greatly reduced, and the aging effect can be enhanced along with the increase of the addition amount after the addition amount is continuously increased after 7%. Therefore, the amount of the antioxidant is considered to be 0.5% to 8% in a comprehensive view.
The anti-aging effect of the anti-aging agent is slightly better than that of the antioxidant, but the influence of the anti-aging agent on aged asphalt can be reduced by adding the antioxidant. As can be seen from FIG. 3, the influence index is significantly increased as the amount of the antioxidant is increased. From the complex modulus main curve, it can be seen that when the doping amount is increased from 1% to 5%, the influence on the as-received asphalt is not obviously increased, but the increase amplitude is small, and when the doping amount is increased to 7%, the influence effect is similar to 5%, and the rutting factor variation curve with temperature is basically similar, although not as obvious as the complex modulus main curve. The compounded antioxidant has the main function of relieving the influence of the anti-aging agent on the original asphalt, the anti-aging effect of the compounded antioxidant is not as good as that of the anti-aging agent, the mixing amount of the antioxidant is correspondingly changed along with the increase of the mixing amount of the anti-aging agent, and the optimal mixing amount of the 2# anti-aging agent is considered to be 0.5-3% by comprehensive consideration.
The addition of the anti-aging agent and the antioxidant has a certain softening effect on original asphalt and has adverse effect on high-temperature anti-rutting performance. The addition of the light stabilizer or the light-shielding agent can effectively improve the high-temperature performance of the asphalt as it is. As shown in FIG. 4, the light stabilizer and the light-shielding agent both have different degrees of anti-UV aging effect, but the anti-aging effect of the light stabilizer is obviously better than that of the light-shielding agent, and the anti-aging effect of the light stabilizer at 1% is obviously better than that of the light-shielding agent at 3%. In addition, the anti-aging effect of the light stabilizer is obviously improved along with the increase of the mixing amount, the influence of the light stabilizer on the original asphalt is comprehensively considered, the light stabilizer is considered to be more suitable to be added into the asphalt as an anti-ultraviolet aging agent, and the reasonable mixing amount of the anti-ultraviolet aging agent is 0.1-3%.
In order to confirm the effect of the present invention, the inventors performed short-term aging and long-term aging on the composite anti-aging agent prepared in example four according to ASTM D2872 and ASTM D6521 standards, and evaluated the high-temperature anti-aging performance of the anti-aging asphalt by the Multiple Stress Creep Test (MSCR), the Test results are shown in fig. 5; the BBR test is adopted to obtain the stiffness modulus S value and the creep rate m value of samples at the temperatures of-12 ℃, 18 ℃ and 24 ℃ to evaluate the effect of the anti-aging asphalt on the degradation of the low-temperature performance by resisting aging, and the test results are shown in Table 1.
TABLE 1
As can be seen from FIG. 5, the strain curve of the as-received asphalt is significantly reduced by the same aging effect, and the aging-resistant asphalt is reduced to a smaller extent and still close to that of the unaged asphalt. Therefore, the composite anti-aging agent has a good effect on the influence of the anti-aging effect on the high-temperature anti-rutting performance of the asphalt.
As can be seen from Table 1, after the anti-aging asphalt is aged, the stiffness moduli at different temperatures are smaller than those of the original asphalt, the m values are larger than those of the original asphalt, the reduction range of the stiffness and the increase range of the m values are larger, and the low-temperature anti-aging effect of the composite anti-aging agent is obvious. The anti-aging agent of the compound asphalt obtained by compounding can be considered to have better anti-aging effect from the performance of the asphalt added with the anti-aging agent on high and low temperature performances.
Claims (4)
1. An asphalt anti-aging agent for roads is characterized in that: the asphalt is prepared by compounding the following raw materials in parts by weight relative to the mass of asphalt.
An anti-aging agent: 1 to 10 percent
Antioxidant: 0.5 to 8 percent
Light stabilizer: 0.1 to 3 percent.
2. The asphalt anti-aging agent for road use according to claim 1, wherein: the anti-aging agent is a nickel-containing compound; the antioxidant is an amine compound; the light stabilizer is hindered amine.
3. The asphalt anti-aging agent for road use according to claim 1, wherein: the anti-aging agent is prepared and used in the following way:
firstly, respectively crushing the antioxidant, the antioxidant and the light stabilizer into powder in a mortar, then weighing the powdery antioxidant, the antioxidant and the light stabilizer into a container according to the weight, stirring for 20min, and fully mixing to prepare the composite asphalt anti-aging agent.
4. The asphalt anti-aging agent for road use according to claim 3, wherein: the preparation method of the anti-aging asphalt comprises the following steps: heating original asphalt in an oven at 135 +/-5 ℃ to a flowing state, then moving the asphalt into a constant-temperature oil bath kettle at 140 +/-5 ℃ and slowly adding the prepared composite anti-aging agent, manually stirring the mixture for 10min at the rotating speed of 60r/min by using a glass rod to uniformly dissolve the anti-aging agent into the asphalt, then stirring the mixture for 45min at the rotating speed of 2000r/min by using a high-torque electric stirrer, and finally manually stirring the mixture for 10min at the rotating speed of 60r/min by using the glass rod to remove bubbles in the anti-aging asphalt, thus preparing the anti-aging asphalt sample.
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| CN113755020A (en) * | 2021-08-20 | 2021-12-07 | 北京工业大学 | Cold region anti-aging asphalt and preparation method thereof |
| CN113921091A (en) * | 2021-11-25 | 2022-01-11 | 西南交通大学 | Modified asphalt main curve construction method based on double S-shaped functions |
| CN114965168A (en) * | 2022-05-23 | 2022-08-30 | 东北林业大学 | Test instrument and method for evaluating physical hardening of asphalt |
| CN115029012A (en) * | 2022-08-11 | 2022-09-09 | 北京工业大学 | Asphalt liquid anti-aging agent and preparation method and application thereof |
| CN116041973A (en) * | 2022-12-06 | 2023-05-02 | 同济大学 | Anti-aging asphalt and preparation method and application thereof |
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| CN116041973A (en) * | 2022-12-06 | 2023-05-02 | 同济大学 | Anti-aging asphalt and preparation method and application thereof |
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