CN112029300A - Low-dosage asphalt regenerant and preparation and application methods thereof - Google Patents
Low-dosage asphalt regenerant and preparation and application methods thereof Download PDFInfo
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Abstract
The invention discloses a low-dosage asphalt regenerant and a preparation and application method thereof. The invention utilizes high-temperature coal tar distillate and penetrating agent to improve the dissolving and regenerating effect of the regenerant on the aged asphalt, and simultaneously improves the performance of the regenerant by doping various modifiers. The regenerant prepared by the invention can recover the component balance of the aged asphalt under the condition of low doping amount (5-7%), realizes the regeneration and utilization of RAP, and changes waste into valuable.
Description
Technical Field
The invention belongs to the field of road engineering materials, and particularly relates to a low-dosage asphalt regenerant and preparation and application methods thereof.
Background
Along with the rapid development of the traffic cause of China, the road traffic mileage is increased day by day. By the end of 2019, the total highway mileage in China is 501.258 kilometers, the highway maintenance mileage is 495.31 kilometers, and the total highway mileage accounts for 98.8%. China has shifted from the construction period to the construction and cultivation period. According to statistics, more than 80% of road surface types in China are asphalt road surfaces, and more than 1.6 million tons of waste asphalt mixture (RAP) are generated by major and middle maintenance projects of trunk roads every year. The recycling technology of the waste asphalt mixture can not only enable the recycled pavement to meet the use requirement again, reduce the engineering investment and save stone and petroleum asphalt resources, but also avoid the influence of the waste pavement materials on the environment and realize the green development of the industry.
The asphalt is gradually aged in the processes of storage, mixing, paving and use, and is characterized by reduced content of aromatic components, increased content of asphaltene, reduced compatibility and compatibility among the components and reduced road performance. The asphalt regenerant has a high aromatic content and a low asphaltene content, thereby adjusting the chemical composition of the aged asphalt to re-equilibrate.
In the prior art, the doping amount of the regenerant is generally 8-12%, the specific doping amount is determined according to the aging degree of the aged asphalt, the index of the mixture to be achieved and the like, and the cost of raw materials is high.
Disclosure of Invention
The invention solves the technical problem that aiming at the defects of the prior art, the invention provides the low-dosage asphalt regenerant and the preparation and application methods thereof, the asphalt regenerating effect is good, and the production cost of the regenerated asphalt mixture can be reduced to a great extent. The regenerant prepared by the invention can recover the component balance of aged asphalt under the condition of low doping amount (5-7 percent), thereby realizing the regeneration and utilization of RAP.
The technical scheme adopted by the invention is as follows:
the low-dosage asphalt regenerant comprises the following components in parts by mass:
the light oil component can provide missing aromatic components for aged asphalt and adjust the balance among four components of the asphalt;
the high-temperature coal tar distillate and the penetrating agent have good dissolving and diluting effects on the aged asphalt, so that the doping amount of the asphalt regenerant is reduced, and the production cost of the regenerated asphalt mixture is further saved;
the invention further comprises the following preferred technical scheme:
in a preferred embodiment, the light oil component is one or more of rubber oil, aromatic oil, extract oil, used oil, and used lubricating oil.
In a preferred scheme, the high-temperature coal tar distillate is one or more of wash oil, anthracene oil and dianthracene oil.
In a preferred scheme, the penetrating agent is one or more of turpentine, rosin water, ethyl acetate and carbon tetrachloride.
In a preferred scheme, the plasticizer is one or more of epoxidized soybean oil, epoxidized butyl fatty acid, epoxidized octyl fatty acid and epoxidized tetrahydrodioctyl phthalate;
the epoxy fatty acid ester plasticizer can replace a high-toxicity phthalate plasticizer, has the advantages of safety and environmental protection, and can be mutually fused with asphalt;
in a preferred scheme, the lubricant is one or more of barium stearate, calcium stearate and zinc stearate;
the stearate lubricant can improve the penetration degree and viscosity of the regenerated asphalt, plays a role of a heat stabilizer and a dispersant at the same time, and has a certain effect of enhancing the heat stability of the regenerant;
in a preferred scheme, the anti-aging agent is organically modified nano montmorillonite;
specifically, a cationic surfactant is utilized to carry out a cation exchange reaction, and the hydrophilicity is changed into lipophilicity, so that the solubility of the cationic surfactant in a regenerant is improved;
the specific preparation steps of the organic modified nano montmorillonite are as follows:
a) preparing nano montmorillonite into a suspension, standing for 24-36h, taking the upper suspension, centrifuging, filtering and drying to obtain purified nano montmorillonite;
b) according to the following steps: (100-200) dispersing the purified nano montmorillonite in a large amount of deionized water to prepare a suspension, and dropwise adding 1-2mol/L HCl/NaOH solution until the pH value is 4-5;
c) weighing hexadecyl trimethyl ammonium bromide which accounts for 15-25% of the mass of the nano montmorillonite in the step a), dissolving the hexadecyl trimethyl ammonium bromide in a proper amount of warm water, dropwise adding the solution obtained in the step b), reacting for 2-3h at 70-80 ℃, cooling, filtering, washing, drying and grinding to obtain the organic modified nano montmorillonite.
The invention further comprises a preparation method of the low-mixing-amount asphalt regenerant, which comprises the following steps:
1) heating the light oil to 60-80 ℃, adding the high-temperature coal tar distillate, the penetrating agent and the plasticizer, keeping the temperature, stirring and mixing uniformly;
2) heating to 100 ℃ and 120 ℃, adding the lubricant and the anti-aging agent, shearing and mixing uniformly, and naturally cooling to obtain the asphalt recycling agent.
The invention further comprises an application method of the asphalt regenerant or the asphalt regenerant prepared by the method, and when the asphalt regenerant is applied, the mass ratio of the aged asphalt to the asphalt regenerant is 100: (5-7).
The invention can obtain the recycled asphalt or recycled asphalt mixture with excellent performance under the condition of lower mixing amount of the recycling agent. Reduces the production cost of the regenerated product and has wide application prospect.
Preferably, the mixing ratio of the waste asphalt mixture in the regenerated asphalt mixture is 30% or more. The regenerant is mainly used for recycling the plant-mixed heat of the asphalt pavement. The invention is characterized in that: the penetration and dissolution effects of the regenerant on the aged asphalt are improved by using the high-temperature coal tar distillate and the penetrant on the base oil component, and the regenerant is favorable for playing the role of regenerating the aged asphalt. Meanwhile, the service performance of the regenerant is improved through the plasticizer, the lubricant and the anti-aging agent modified components, so that the asphalt thermal regenerant with good regeneration effect, low use mixing amount, excellent stability and excellent anti-aging performance is obtained. The asphalt regenerant prepared by the invention has excellent regeneration effect, needs lower doping amount and has positive significance for saving the cost of the regenerated asphalt mixture.
The asphalt regenerant disclosed by the invention has an excellent effect on regenerating heavy traffic petroleum asphalt and also has a remarkable regeneration effect on aged modified asphalt. The asphalt regenerant has wide application range, has important significance for saving stone and petroleum resources, and is beneficial to environmental protection and sustainable development.
Has the advantages that:
the invention utilizes high-temperature coal tar distillate and penetrating agent to improve the dissolving and regenerating effect of the regenerant on the aged asphalt, and simultaneously improves the performance of the regenerant by doping various modifiers. The regenerant prepared by the invention can restore the component balance of aged asphalt under the condition of low doping amount (only 5-7% of the doping amount is needed for aged asphalt with higher aging degree), realizes the recycling of RAP, and reduces the raw material cost and the production cost of the regenerated asphalt mixture. The regenerant disclosed by the invention has an excellent asphalt regeneration effect and is good in stability and ageing resistance.
The invention can not only recover the component balance of the aged asphalt and improve the road performance, but also realize the recycling of the waste asphalt mixture, reduce the maintenance cost of the asphalt pavement and obtain excellent regenerated aged asphalt by using the least amount of the regenerant.
The light oil and the high-temperature coal tar distillate used in the invention are beneficial to supplement the light components lost in the asphalt aging process and improve the proportion of the four components. The viscosity of the asphalt mixture is reduced and the fluidity of the asphalt mixture is improved through the penetrant, so that the regenerant can be well wrapped on the surface of the waste asphalt mixture and is fully mixed with the aged asphalt. By compounding the plasticizer, the lubricant and the anti-aging agent, the regenerant has better dissolution and diffusion performance, stability and aging resistance in the aged asphalt, and is favorable for recovering the comprehensive pavement performance of the waste asphalt mixture. The regenerated asphalt mixture prepared by the method has excellent performance, the mixing ratio of the waste asphalt mixture can reach 30% or more, the use amount of new asphalt and stone is reduced, the raw material cost is saved, and non-renewable resources are saved. Meanwhile, the environment-friendly and nontoxic epoxy resin is used for replacing phthalate as a plasticizer and a stabilizer, so that the use safety of the regenerant is improved, the environment protection is facilitated, and the sustainable development is realized.
Detailed Description
The present solution is further illustrated below with reference to specific preferred embodiments, which have no limiting effect on the scope of protection of the present invention.
Example 1:
the asphalt regenerant consists of the following raw materials in percentage by mass: 100 parts of rubber oil, 20 parts of dianthracene oil, 5 parts of turpentine, 15 parts of epoxy fatty acid butyl ester, 2 parts of calcium stearate and 5 parts of organic nano montmorillonite.
According to the proportion, the preparation steps of the asphalt regenerant are as follows:
heating rubber oil to 60-80 deg.C, adding dianthracene oil, oleum Terebinthinae and epoxy fatty acid butyl ester, stirring at a speed of 50-100r/min for 10-20min, and mixing; heating to 100-; and naturally cooling to obtain the asphalt regenerant.
Example 2:
the asphalt regenerant consists of the following raw materials in percentage by mass: 90 parts of aromatic oil, 10 parts of anthracene oil, 7 parts of rosin water, 13 parts of epoxidized soybean oil, 5 parts of barium stearate and 1 part of organic nano montmorillonite.
According to the proportion, the preparation steps of the asphalt regenerant are as follows:
heating aromatic oil to 60-80 deg.C, adding anthracene oil, rosin water and epoxidized soybean oil, stirring at a speed of 50-100r/min for 10-20min, and mixing; heating to 100-; and naturally cooling to obtain the asphalt regenerant.
Example 3:
the asphalt regenerant consists of the following raw materials in percentage by mass: 80 parts of waste engine oil, 15 parts of anthracene oil, 10 parts of ethyl acetate, 10 parts of epoxy fatty acid octyl ester, 1 part of barium stearate and 3 parts of organic nano montmorillonite.
According to the proportion, the preparation steps of the asphalt regenerant are as follows:
heating the waste engine oil to 60-80 ℃, adding anthracene oil, ethyl acetate and epoxy fatty acid octyl ester, keeping the temperature at 50-100r/min, stirring for 10-20min, and uniformly mixing; heating to 100-; and naturally cooling to obtain the asphalt regenerant.
Example 4:
the asphalt regenerant consists of the following raw materials in percentage by mass: 100 parts of waste lubricating oil, 30 parts of washing oil, 5 parts of carbon tetrachloride, 20 parts of epoxy tetrahydrophthalic acid dioctyl ester, 5 parts of zinc stearate and 1 part of organic nano montmorillonite.
According to the proportion, the preparation steps of the asphalt regenerant are as follows:
heating the waste lubricating oil to 60-80 ℃, adding washing oil, carbon tetrachloride and epoxy tetrahydro dioctyl phthalate, keeping the temperature at 50-100r/min, stirring for 10-20min, and uniformly mixing; heating to 100-; and naturally cooling to obtain the asphalt regenerant.
Comparative example 1:
comparative example 1 compared to example 1, the regenerant feed did not contain any high temperature coal tar distillate, and the remaining composition and preparation steps were the same.
Comparative example 2:
comparative example 2 compared with example 1, the regenerant feed did not contain any penetrant, and the remaining composition and preparation steps were the same.
Comparative example 3:
comparative example 3 compared to example 1, the regenerant starting material did not contain any plasticizer, and the remaining composition and preparation steps were the same.
Comparative example 4:
comparative example 4 compared to example 1, the regenerant feed did not contain any lubricant and the remaining composition and preparation steps were the same.
Comparative example 5:
comparative example 5 compared with example 1, the regenerant raw material did not contain any anti-aging agent, and the rest of the composition and the preparation steps were the same.
The regenerants prepared in comparative examples 1 to 4 were subjected to a comparative test with the regenerants prepared in examples 1 to 4, and the regeneration performance and the aging resistance of the regenerants were tested to evaluate that the performance of the regenerants was excellent.
Randomly selecting a milling material on a road section with serious aging for recovering and extracting aged asphalt, and testing three indexes of the aged asphalt. The 6% example regenerant or the comparative example regenerant is added into the aged asphalt, three indexes of the regenerated asphalt and the aging resistance of the regenerant are tested, and the test results are shown in table 1.
TABLE 1 test results of the regenerant regeneration performance and aging resistance
As can be seen from the test results in Table 1, the recycling agents prepared in examples 1 to 4 have good recovery effects on three major indicators of the aged asphalt and excellent anti-aging performance (the viscosity ratio and the mass loss of the recycling agent after aging in a film oven test are small). While comparative examples 1-4, which did not add a certain rejuvenating agent component, exhibited poor rejuvenating or anti-aging properties. The regeneration test of the aged asphalt uses a low-doping-amount regenerant, and the regenerated asphalt can be restored to be similar to No. 70 heavy traffic petroleum asphalt only under the doping amount of 6 percent of the regenerant. The asphalt regenerant prepared by the multiple modifiers has the advantages of high efficiency and cost saving.
For heavy-traffic petroleum asphalt, the aging, regeneration, etc. of the asphalt can be analyzed from the balance between the asphalt four components. Asphalt is mixed and paved, and aged under the action of light, heat, water and ultraviolet rays all the year round, which is mainly reflected by the reduction of light components such as saturated components and aromatic components and the increase of colloid and asphaltene. The high-quality regenerant has high aromatic content, and can supplement light components missing in aged asphalt, so that the four-component content of the regenerated asphalt is close to that of new asphalt. The test was carried out using example 1, and the results of the four-component test on the regenerant and the asphalt are shown in Table 2.
TABLE 2 four-component test results for regenerants and asphalts
| Material | Saturation fraction | Aromatic component | Glue | Asphaltenes |
| Regenerant | 29.36 | 41.38 | 27.01 | 2.25 |
| New heavy traffic petroleum asphalt | 26.97 | 32.89 | 24.73 | 15.41 |
| Recovery of heavy traffic petroleum asphalt | 23.86 | 27.24 | 30.10 | 18.80 |
| Regenerated heavy traffic petroleum asphalt | 25.45 | 31.85 | 27.00 | 15.70 |
The regenerant prepared in example 1 has high aromatic content and low asphaltene content, and can well adjust four-component balance of aged asphalt. Compared with the recycled asphalt, the content of saturated components and aromatic components is improved, and the content of colloid and asphaltene is reduced. And the four-component content of the regenerated asphalt is similar to that of the new asphalt. According to the analysis of the four-component test result of the asphalt, the regenerant can adjust the balance of components in the asphalt, so that the missing components in the aged asphalt are supplemented to the extent of being matched with the new asphalt.
The asphalt regenerant can be used for regenerating asphalt mixture with high RAP mixing amount (30% or more). The mixture using a common regenerant or the regenerant of example 1 of the present invention was tested for use with a commercially widely available common regenerant (Supotexhum-RA 101, asphalt regenerant) as a comparison.
The performance test of the reclaimed asphalt mixture respectively uses 30 percent of RAP and 40 percent of RAP, wherein the mixing amount of the regenerant in the example 1 is 6 percent of that of the aged asphalt, and the mixing amount of the common regenerant is 9 percent of that of the aged asphalt.
TABLE 3 recycled asphalt mixture usability test results
In sum, the comprehensive pavement performance of the asphalt mixture prepared by using the regenerant in the embodiment of the invention is superior to that of the asphalt mixture prepared by using a common regenerant. The dynamic stability of the example group is lower than that of the common regenerant group, but the road performance index is still met. It is demonstrated that the rejuvenating agents in the examples of the invention have good softening penetration on the aged bitumen attached to the RAP. The water stability and low temperature performance of the example group are superior to those of the common regenerant group and meet the specification requirements.
At high RAP loadings (30% and above), the asphalt regenerant of the present invention can be used in small amounts (6%) to achieve superior road performance over conventional regenerants used at normal loadings (9%). Generally speaking, the mixing amount of the regenerant is in the range of 8% -12% according to different aging degrees of aged asphalt, if the mixing amount is too low, the regenerated asphalt can not completely recover to the index of the original asphalt, and if the mixing amount is too high, the cost control and the high-temperature performance of the regenerated asphalt are not favorable. The invention reduces the mixing amount of the regenerant again on the basis of low mixing amount of the regenerant, so that the asphalt with serious aging can be efficiently regenerated by only using 5-7% of the regenerant. The invention has higher cost performance compared with the common regenerant by comprehensively considering the factors of price, usage amount, effect and the like.
The invention has been described in terms of the preferred embodiments, but the invention can be practiced within the limits of the individual materials, which are not listed here. Various modifications and changes may occur to those skilled in the art in light of the present disclosure. Therefore, any simple modification and equivalent changes made according to the concept of the present invention should fall within the protection scope of the present invention.
Claims (10)
1. The low-dosage asphalt regenerant is characterized by comprising the following components in parts by mass:
80-100 parts of light oil component
10-30 parts of high-temperature coal tar distillate
5-10 parts of penetrant
10-20 parts of plasticizer
1-5 parts of lubricant
1-5 parts of anti-aging agent.
2. The low-dosage asphalt regenerant as claimed in claim 1, wherein the light oil component is one or more of rubber oil, aromatic oil, extract oil, waste engine oil and waste lubricating oil.
3. The low-dosage asphalt regenerant as claimed in claim 1, wherein the high-temperature coal tar distillate is one or more of wash oil, anthracene oil and dianthracene oil.
4. The low-dosage asphalt recycling agent according to any one of claims 1 to 3, wherein: the plasticizer is an epoxy ester plasticizer; the lubricant is one or more of barium stearate, calcium stearate and zinc stearate; the anti-aging agent is organically modified nano montmorillonite.
5. The low-dosage asphalt recycling agent according to claim 4, wherein: the plasticizer is one or more of epoxidized soybean oil, epoxidized butyl fatty acid, epoxidized octyl fatty acid and epoxidized tetrahydrodioctyl phthalate.
6. The low-dosage asphalt recycling agent according to claim 4, wherein: the preparation method of the organically modified nano montmorillonite comprises the following steps:
preparing nano montmorillonite into a suspension, standing for 24-36h, taking the upper suspension, centrifuging, filtering and drying to obtain purified nano montmorillonite;
according to the following steps: (100-200) dispersing the purified nano montmorillonite in a large amount of deionized water to prepare a suspension, and dropwise adding 1-2mol/L HCl/NaOH solution until the pH value is 4-5;
weighing hexadecyl trimethyl ammonium bromide which accounts for 15-25% of the mass of the nano montmorillonite in the step a), dissolving the hexadecyl trimethyl ammonium bromide in a proper amount of warm water, dropwise adding the solution obtained in the step b), reacting for 2-3h at 70-80 ℃, cooling, filtering, washing, drying and grinding to obtain the organic modified nano montmorillonite.
7. The method for preparing the low-dosage asphalt regenerant as defined in any one of claims 1-6, wherein the preparation method comprises the steps of:
1) heating the light oil to 60-80 ℃, adding the high-temperature coal tar distillate, the penetrating agent and the plasticizer, keeping the temperature, stirring and mixing uniformly;
2) heating to 100 ℃ and 120 ℃, adding the lubricant and the anti-aging agent, shearing and mixing uniformly, and naturally cooling to obtain the asphalt recycling agent.
8. The method for preparing the low-dosage asphalt regenerant according to claim 7, wherein the method comprises the following steps: the stirring speed in the step 1) is 50-100r/min, and the stirring time is 10-20 min.
9. The method for preparing the low-dosage asphalt regenerant according to claim 7, wherein the method comprises the following steps: the shearing rate in the step 2) is 2000-3000r/min, and the shearing time is 20-30 min.
10. An application method of a low-dosage asphalt regenerant is characterized by comprising the following steps: the method comprises the following steps of preparing a recycled asphalt mixture by using an asphalt recycling agent, wherein the mass ratio of the used aged asphalt to the asphalt recycling agent is 100: (5-7);
the asphalt recycling agent is the asphalt recycling agent of any one of claims 1 to 6 or the asphalt recycling agent prepared by the preparation method of any one of claims 7 to 9, and when the recycled asphalt mixture is prepared, the mixing ratio of the waste asphalt mixture in the recycled asphalt mixture is 30% or more.
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Cited By (5)
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| CN112795204A (en) * | 2020-12-30 | 2021-05-14 | 长安大学 | High-permeability asphalt regenerant and preparation method thereof |
| CN113337134A (en) * | 2021-05-25 | 2021-09-03 | 山东交通学院 | Modified asphalt compatilizer and preparation method thereof |
| CN114806199A (en) * | 2022-05-10 | 2022-07-29 | 长安大学 | Composite waste engine oil-based asphalt regenerant and preparation method and application thereof |
| CN115772333A (en) * | 2022-12-07 | 2023-03-10 | 东南大学 | Method for preparing biological regenerant based on microwave thermal cracking technology, biological regenerant and application |
| CN116675987A (en) * | 2023-05-30 | 2023-09-01 | 中交第一公路勘察设计研究院有限公司 | Weather-resistant asphalt pavement regenerant and preparation method thereof |
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| CN106751977A (en) * | 2017-03-24 | 2017-05-31 | 天津双君智材科技发展有限公司 | Heat-resisting pitch micro-crack selfreparing microcapsules high and preparation method thereof |
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| CN112795204A (en) * | 2020-12-30 | 2021-05-14 | 长安大学 | High-permeability asphalt regenerant and preparation method thereof |
| CN113337134A (en) * | 2021-05-25 | 2021-09-03 | 山东交通学院 | Modified asphalt compatilizer and preparation method thereof |
| CN113337134B (en) * | 2021-05-25 | 2022-04-01 | 山东交通学院 | Modified asphalt compatilizer and preparation method thereof |
| CN114806199A (en) * | 2022-05-10 | 2022-07-29 | 长安大学 | Composite waste engine oil-based asphalt regenerant and preparation method and application thereof |
| CN115772333A (en) * | 2022-12-07 | 2023-03-10 | 东南大学 | Method for preparing biological regenerant based on microwave thermal cracking technology, biological regenerant and application |
| CN115772333B (en) * | 2022-12-07 | 2023-12-22 | 东南大学 | Method for preparing biological regenerant based on microwave thermal cracking technology, biological regenerant and application |
| CN116675987A (en) * | 2023-05-30 | 2023-09-01 | 中交第一公路勘察设计研究院有限公司 | Weather-resistant asphalt pavement regenerant and preparation method thereof |
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