CN111410848A - High-performance asphalt pavement regenerant and preparation method thereof - Google Patents
High-performance asphalt pavement regenerant and preparation method thereof Download PDFInfo
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Abstract
The invention provides a high-performance asphalt pavement regenerant and a preparation method thereof, wherein the high-performance asphalt pavement regenerant is prepared from the following raw materials in parts by weight: the activating component is 60-70 parts, the penetrating component is 5-10 parts, the plasticizing component is 10-15 parts, the modifying component is 8-15 parts, the anti-aging component is 3-6 parts, and the sum of the parts by weight of the raw materials is 100 parts. The invention selects the synergistic combination of heat stability substances as the activating component to replace the traditional aromatic oil activating component, thereby not only greatly improving the heat stability of the regenerant, but also improving the long-term aging performance of the regenerated mixture. The selected surfactant causes the associated structure of the asphaltene to be dissociated, and promotes the dissolution and dispersion of the asphaltene. The preparation method is simple in preparation process and wide in raw material source, starts from the asphalt aging mechanism, considers the activation and performance blending of the aging component, and the prepared regenerant has excellent road performance and wide application prospect.
Description
Technical Field
The invention belongs to the technical field of road engineering, relates to a regenerant, and particularly relates to a high-performance asphalt pavement regenerant and a preparation method thereof.
Background
In the face of huge maintenance and repair markets, a large amount of asphalt mixture waste is generated in the annual maintenance and repair of the road surface, and the waste old asphalt mixtures not only occupy a large amount of land, but also cause ecological environment pollution. Meanwhile, a large amount of new asphalt mixture needs to be produced to replace the waste old asphalt mixture, and a large amount of resources and construction funds are consumed. And, with the gradual deepening of the environmental protection idea, the exploitation of the high-quality aggregate is more and more difficult. Therefore, the method has remarkable economic, social and environmental benefits for recycling the old asphalt pavement material of the highway. The asphalt pavement thermal regeneration technology has become the core technology of the current highway maintenance by virtue of the specific technical advantages, and has been well popularized in a plurality of provinces and cities.
The key of the asphalt pavement material thermal regeneration technology is the asphalt regeneration technology, so the regeneration technology is the regeneration and recovery of the performance of the old asphalt, and the asphalt regeneration is the inverse process of asphalt aging, so the research on the attenuation rule of the road performance after the asphalt aging and the aging mechanism have important guiding significance on the research and development of the asphalt regenerant. The unified recognition achieved during the earlier studies was that during aging, light components volatilize, asphaltenes associate, form supramolecular structures and aggregate, promoting the transformation of the asphalt system to gelation. Therefore, in the research of the regenerant, the components are almost blended based on the mechanism to achieve performance recovery, activation excitation of aged asphalt and the influence of old materials and a regeneration process on the performance recovery are not considered, and the disease pertinence to the asphalt pavement is not strong. In addition, in the heating and stirring process, the contact time of the regenerant and the aged asphalt is only about 60s, so the blending and repairing effect is very limited. In addition, a large amount of light oil added into the regenerant is volatile and cannot exist stably for a long time, and the improvement effect stays at the initial stage, so that the current asphalt pavement thermal regeneration technology is in different situations in different areas of China.
Therefore, with the arrival of high-grade highway maintenance wave and the shortage of high-quality mineral stones, the development of the asphalt pavement regenerant with excellent performance is urgently needed to improve the thermal regeneration effect of the asphalt pavement and prolong the service life of the asphalt pavement, so that the asphalt pavement regenerant has important economic and social benefits.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a high-performance asphalt pavement regenerant and a preparation method thereof, and solves the technical problems of poor permeation and repair effects and poor performance improvement in the prior regenerant technology.
In order to solve the technical problems, the invention adopts the following technical scheme:
a high-performance asphalt pavement regenerant is prepared from the following raw materials in parts by weight: the activating component is 60-70 parts, the penetrating component is 5-10 parts, the plasticizing component is 10-15 parts, the modifying component is 8-15 parts, the anti-aging component is 3-6 parts, and the sum of the parts by weight of the raw materials is 100 parts.
The invention also has the following technical characteristics:
specifically, the method comprises the following steps:
the activating component is prepared by mixing 1, 4-butanediol, 1, 5-pentanediol, ethylene glycol ethyl ether acetate and 1-octanol according to the weight ratio of 1:2:0.5: 1;
the penetrating component is prepared by mixing a nonionic wetting agent, a dispersing agent and a wetting dispersing agent according to the weight ratio of 1:2: 1;
the plasticizing component comprises tung oil, palm oil, cedar oil, tea seed oil, dibutyl maleate, dianhydride and catalyst iodine in a weight ratio of 4:2:3:2:1:1: 1;
the modified component is prepared by mixing solid resin, an adhesion promoter and tetrabutyl titanate according to the weight ratio of 2:1: 0.5;
the anti-aging component is prepared by mixing octadecyl 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, 2' -methylene-bis (4-methyl-6-tert-butylphenol) and 2- (4, 6-bis (2, 4-dimethylphenyl) -1,3, 5-triazine-2-yl) -5-octyloxyphenol according to the weight ratio of 2:1: 2.
Specifically, the preparation method of the plasticizing component comprises the following steps:
uniformly mixing tung oil, palm oil, cedar oil and tea seed oil to obtain a mixture A;
adding the mixture A, dibutyl maleate and succinic anhydride into a reaction kettle, adding catalyst iodine, stirring at the speed of 100rpm, introducing nitrogen, heating to 280 ℃ within 30min, and stirring at constant temperature for reaction for 5 hours;
and step three, cooling to room temperature under the protection of nitrogen after the reaction is finished, filtering out the solid catalyst, collecting oily filtrate, adding petroleum ether with the weight being 2 times that of the oily filtrate, and extracting for 2 times to obtain viscous liquid, namely the plasticizing component.
The invention also provides a preparation method of the high-performance asphalt pavement regenerant, which adopts the formula of the high-performance asphalt pavement regenerant.
Specifically, the method comprises the following specific processes: heating the activated component to 80 deg.C, adding the osmotic component, and shearing at 1000rpm for 10 min; heating to 120 ℃, adding plasticizing components, and shearing at the speed of 3000rpm for 20 min; adding the modified component at constant temperature, and shearing at 3000rpm for 10 min; adding the anti-aging component at constant temperature, and shearing at 3000rpm for 10 min; and then cooling to room temperature to prepare the environment-friendly asphalt pavement regenerant.
Compared with the prior art, the invention has the following technical effects:
the invention (I) selects the synergistic combination of thermal stability substances of 1, 4-butanediol, 1, 5-pentanediol, ethylene glycol ether acetate and 1-octanol as the activating component to replace the traditional aromatic oil activating component, thereby not only greatly improving the thermal stability of the regenerant, but also improving the long-term aging performance of the regenerated mixture. Meanwhile, the polar parts on the molecular chains of the activating components can be directionally arranged at the polar parts of the asphaltenes, so that the polar groups of the aged asphaltenes are surrounded, and the attraction among the molecular chains of the polar asphaltenes is weakened; in addition, the non-polar part of the molecular chain of the activating component is mixed between the molecular chains of the asphaltene to play a role of dispersing the molecular chains, so that the movement of the molecular chains of the asphaltene is easier, and macroscopically, the effect of softening and mixing of aged asphaltene is realized, namely, the activating and exciting effect is realized. In addition, due to the lower viscosity of the activating component, the dispersion and movement of the asphaltenes are promoted, the miscibility effect with the plasticizing component and the modifying component is improved, and the deformation and adhesion behavior of the aged asphalt is improved.
(II) the three surfactants selected by the invention contain carboxyl, hydroxyl, ether and other functional groups with strong steric hindrance effect, and can generate acid-base or hydrogen bond action with heteroatoms on the surface of the asphaltene particles, so that a space stable layer is formed on the surface of the asphaltene particles, the interparticle repulsion force is increased, the asphaltene association structure is subjected to dissociation, the asphaltene particles are well dispersed, and the degree of association is reduced; meanwhile, the selected surfactant molecules form a good solvolysis layer on the surface of the asphaltene, so that the effective size of asphaltene particles is increased, the solubility gradient between the asphaltene and the new asphalt is reduced, the permeation effect is improved, and the exertion of the effect of an activated component is further promoted.
Compared with the traditional plasticizer, the plasticizer prepared by the invention is non-toxic and harmless, and the raw material source is wide. The molecular weight of the modified asphalt is 5000-10000, the modified asphalt belongs to a long-chain molecular structure with larger molecular weight, the interaction between carbonyl in an ester group and asphaltene molecules is enhanced by a stronger polar group, the modified asphalt is easier to wind with a polyvinyl chloride chain segment to form a firm cross-linking structure, and the modified asphalt is stable and compact in high-temperature performance, prolongs a decomposition balance area, and maintains higher thermal decomposition stability, so that the modified asphalt has stable high-temperature performance, and can promote the asphalt to keep excellent deformation performance under the low-temperature condition.
(IV) the solid resin, the adhesion promoter and the tetrabutyl titanate selected by the invention can improve the chemical adhesion of the regenerated asphalt and the aggregate surface, especially the acidic aggregate, form a softer adhesion layer on the aggregate surface, relieve the blackstone effect of aged asphalt, avoid the negative effect caused by the increase of the asphalt film thickness by the traditional tackifier and improve the water stability of the regenerated mixture.
The preparation process is simple, the raw materials are widely available, and the prepared regenerant has excellent pavement performance from the asphalt aging mechanism by considering the activation and performance blending of the aging components.
The present invention will be explained in further detail with reference to examples.
Detailed Description
The raw materials adopted by the invention are all known products sold in the prior art, and as the preferable conditions of the invention, part of the raw materials have the following specifications:
the nonionic wetting agent is available in the form of Carbowet GA-100.
The dispersant was model number Disponer 904S.
The wetting dispersant is model No. Wet 250.
The solid resin was type TEGO L TH.
The adhesion promoter was Adherant P L H.
The following embodiments of the present invention are provided, and it should be noted that the present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention are within the protection scope of the present invention.
Example 1:
the embodiment provides a high-performance asphalt pavement regenerant which is prepared from the following raw materials in parts by weight: the activating component is 60 parts, the penetrating component is 10 parts, the plasticizing component is 13 parts, the modifying component is 13 parts, and the anti-aging component is 4 parts.
Specifically, the method comprises the following steps:
the activating component is prepared by mixing 1, 4-butanediol, 1, 5-pentanediol, ethylene glycol ethyl ether acetate and 1-octanol according to the weight ratio of 1:2:0.5: 1;
the penetrating component is prepared by mixing a nonionic wetting agent, a dispersing agent and a wetting dispersing agent according to the weight ratio of 1:2: 1;
the plasticizing component comprises tung oil, palm oil, cedar oil, tea seed oil, dibutyl maleate, dianhydride and catalyst iodine in a weight ratio of 4:2:3:2:1:1: 1;
the modified component is prepared by mixing solid resin, an adhesion promoter and tetrabutyl titanate according to the weight ratio of 2:1: 0.5;
the anti-aging component is prepared by mixing octadecyl 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, 2' -methylene-bis (4-methyl-6-tert-butylphenol) and 2- (4, 6-bis (2, 4-dimethylphenyl) -1,3, 5-triazine-2-yl) -5-octyloxyphenol according to the weight ratio of 2:1: 2.
Further, the method of preparing the plasticizing component includes the steps of:
uniformly mixing tung oil, palm oil, cedar oil and tea seed oil to obtain a mixture A;
adding the mixture A, dibutyl maleate and succinic anhydride into a reaction kettle, adding catalyst iodine, stirring at the speed of 100rpm, introducing nitrogen, heating to 280 ℃ within 30min, and stirring at constant temperature for reaction for 5 hours;
and step three, cooling to room temperature under the protection of nitrogen after the reaction is finished, filtering out the solid catalyst, collecting oily filtrate, adding petroleum ether with the weight being 2 times that of the oily filtrate, and extracting for 2 times to obtain viscous liquid, namely the plasticizing component.
The preparation method of the high-performance asphalt pavement recycling agent comprises the following specific steps: heating the activated component to 80 deg.C, adding the osmotic component, and shearing at 1000rpm for 10 min; heating to 120 ℃, adding plasticizing components, and shearing at the speed of 3000rpm for 20 min; adding the modified component at constant temperature, and shearing at 3000rpm for 10 min; adding the anti-aging component at constant temperature, and shearing at 3000rpm for 10 min; and then cooling to room temperature to prepare the environment-friendly asphalt pavement regenerant.
The results of the performance tests of this example are shown in Table 1.
Example 2:
the embodiment provides a high-performance asphalt pavement regenerant which is prepared from the following raw materials in parts by weight: the activating component is 70 parts, the penetrating component is 5 parts, the plasticizing component is 10 parts, the modifying component is 9 parts, and the anti-aging component is 6 parts.
Specifically, the raw material ratios and preparation methods of the activating component, the penetrating component, the plasticizing component, the modifying component and the anti-aging component are the same as those in example 1.
The preparation method of the high-performance asphalt pavement recycling agent of the embodiment is the same as that of the high-performance asphalt pavement recycling agent of the embodiment 1.
The results of the performance tests of this example are shown in Table 1.
Example 3:
the embodiment provides a high-performance asphalt pavement regenerant which is prepared from the following raw materials in parts by weight: the activating component is 65 parts, the penetrating component is 8 parts, the plasticizing component is 15 parts, the modifying component is 8 parts, and the anti-aging component is 4 parts.
Specifically, the raw material ratios and preparation methods of the activating component, the penetrating component, the plasticizing component, the modifying component and the anti-aging component are the same as those in example 1.
The preparation method of the high-performance asphalt pavement recycling agent of the embodiment is the same as that of the high-performance asphalt pavement recycling agent of the embodiment 1.
The results of the performance tests of this example are shown in Table 1.
Example 4:
the embodiment provides a high-performance asphalt pavement regenerant which is prepared from the following raw materials in parts by weight: the activating component is 63 parts, the penetrating component is 8 parts, the plasticizing component is 11 parts, the modifying component is 15 parts, and the anti-aging component is 3 parts.
Specifically, the raw material ratios and preparation methods of the activating component, the penetrating component, the plasticizing component, the modifying component and the anti-aging component are the same as those in example 1.
The preparation method of the high-performance asphalt pavement recycling agent of the embodiment is the same as that of the high-performance asphalt pavement recycling agent of the embodiment 1.
The results of the performance tests of this example are shown in Table 1.
Example 5:
the embodiment provides a high-performance asphalt pavement regenerant which is prepared from the following raw materials in parts by weight: the activating component is 68 parts, the penetrating component is 6 parts, the plasticizing component is 10 parts, the modifying component is 10 parts, and the anti-aging component is 6 parts.
Specifically, the raw material ratios and preparation methods of the activating component, the penetrating component, the plasticizing component, the modifying component and the anti-aging component are the same as those in example 1.
The preparation method of the high-performance asphalt pavement recycling agent of the embodiment is the same as that of the high-performance asphalt pavement recycling agent of the embodiment 1.
The results of the performance tests of this example are shown in Table 1.
Comparative example 1:
the comparative example provides an asphalt pavement regenerant which is prepared from the following raw materials in parts by weight: the activating component is 68 parts, the penetrating component is 6 parts, the plasticizing component is 10 parts, the modifying component is 10 parts, and the anti-aging component is 6 parts.
The raw material ratios and preparation methods of the penetration component, the plasticizing component, the modifying component and the anti-aging component of the comparative example were the same as those of example 5.
This comparative example differs from example 5 only in the spark component, in that the activating component is 1, 4-butanediol.
The preparation method of the asphalt pavement recycling agent of the comparative example is basically the same as that of the high-performance asphalt pavement recycling agent in example 5.
The results of the performance testing of this comparative example are shown in table 1.
Comparative example 2:
the comparative example provides an asphalt pavement regenerant which is prepared from the following raw materials in parts by weight: the activating component is 68 parts, the penetrating component is 6 parts, the plasticizing component is 10 parts, the modifying component is 10 parts, and the anti-aging component is 6 parts.
The raw material ratios and preparation methods of the penetration component, the plasticizing component, the modifying component and the anti-aging component of the comparative example were the same as those of example 5.
This comparative example, in which the activating component was 1, 5-pentanediol, differs from example 5 only in the spark component.
The preparation method of the asphalt pavement recycling agent of the comparative example is basically the same as that of the high-performance asphalt pavement recycling agent in example 5.
The results of the performance testing of this comparative example are shown in table 1.
Comparative example 3:
the comparative example provides an asphalt pavement regenerant which is prepared from the following raw materials in parts by weight: the activating component is 68 parts, the penetrating component is 6 parts, the plasticizing component is 10 parts, the modifying component is 10 parts, and the anti-aging component is 6 parts.
The raw material ratios and preparation methods of the penetration component, the plasticizing component, the modifying component and the anti-aging component of the comparative example were the same as those of example 5.
This comparative example differs from example 5 only in the spark component, in that the activating component is ethylene glycol monoethyl ether acetate.
The preparation method of the asphalt pavement recycling agent of the comparative example is basically the same as that of the high-performance asphalt pavement recycling agent in example 5.
The results of the performance testing of this comparative example are shown in table 1.
Comparative example 4:
the comparative example provides an asphalt pavement regenerant which is prepared from the following raw materials in parts by weight: the activating component is 68 parts, the penetrating component is 6 parts, the plasticizing component is 10 parts, the modifying component is 10 parts, and the anti-aging component is 6 parts.
The raw material ratios and preparation methods of the penetration component, the plasticizing component, the modifying component and the anti-aging component of the comparative example were the same as those of example 5.
This comparative example differs from example 5 only in the spark component, in that the activating component is 1-octanol.
The preparation method of the asphalt pavement recycling agent of the comparative example is basically the same as that of the high-performance asphalt pavement recycling agent in example 5.
The results of the performance testing of this comparative example are shown in table 1.
Comparative example 5:
this comparative example shows a commercial regenerant, type HRA-2.
And (3) performance testing:
in view of the limitation of the aged asphalt extraction method, the invention adopts the aging of a rotary film oven to simulate the aging of asphalt pavement, so as to prepare aged asphalt to evaluate the pavement performance of the regenerant. The self-made regenerants prepared in examples 1 to 5 of the present invention, comparative examples 1 to 4, and a self-made regenerant and a certain commercially available regenerant (comparative example 5) were added in an amount of 7%, and the penetration, softening point, viscosity, and ductility indexes of the regenerated asphalt were examined with reference to test procedures for road engineering asphalt and asphalt mixtures (JTG E20-2011), and the test results are shown in table 1. Meanwhile, the performance evaluation comparative analysis of the regenerated asphalt mixture is carried out by combining the waste asphalt mixture (RAP) obtained by milling and planing a certain asphalt pavement maintenance and repair pavement. The mix proportion of the recycled mixture is designed according to technical Specification for road asphalt pavement regeneration (JTG F41-2008), and the Marshall design method is adopted as the mix proportion design method. The adding proportion of RAP is 30%, the type of the recycled asphalt mixture is AC-25, the grading curve of the recycled mixture is determined to be close to the standard median value according to the screening result of the new material and the grading composition of the reference material, the dosage of the regenerant is determined to be 9% of that of the old asphalt according to the Marshall test result, and the optimal oilstone ratio is determined to be 4.1%. The comparative results of the properties of the reclaimed blend are shown in Table 2, wherein the test stress level for the semi-circular bending fatigue life is 0.3.
Table 1 recycled asphalt Performance test data
Table 2 recycled mix performance test data
As can be seen from the data in Table 1, the high-temperature indexes of comparative examples 1 to 4 are obviously greater than those of the examples, but the low-temperature performance is low, which shows that the asphalt has no sufficient activation effect on aged asphaltenes, and the repair effect on the asphalt needs to be further improved; the repairing effect of the comparative example 1 on the aged asphalt is basically the same as that of each example, however, according to the performance indexes of the matrix asphalt and the SBS modified asphalt aged by RTFOT, the performance index fluctuation of the comparative example 1 is obviously larger than the index change of each example, which shows that the anti-aging performance of the regenerated asphalt of each example of the invention is obviously better than that of the comparative example 1. And, the performance test results of the asphalt mixture in table 2 are combined, so that the low-temperature bending strain and freeze-thaw cleavage strength ratio of each embodiment of the invention are obviously superior to those of comparative examples 1 to 5, mainly because the regenerant of the invention can fully permeate and activate aged asphaltene on the surface of RAP, the mixing and dissolving effect of the regenerant with a plasticizing component and a modifying component is improved, a uniform and stable colloid structure is formed, and the plasticizing component and the modifying component improve the deformation and interface adhesion effect, the low-temperature crack resistance and the water damage resistance of the asphalt mixture are greatly improved, and the long-term pavement performance of the regenerated mixture is superior. In conclusion, the regenerant prepared by the invention has good permeability and repair effect, the regenerated mixture has excellent long-term performance, and the method is simple and has good social and economic benefits and development prospect.
Claims (5)
1. The high-performance asphalt pavement regenerant is characterized by being prepared from the following raw materials in parts by weight: the activating component is 60-70 parts, the penetrating component is 5-10 parts, the plasticizing component is 10-15 parts, the modifying component is 8-15 parts, the anti-aging component is 3-6 parts, and the sum of the parts by weight of the raw materials is 100 parts.
2. The high-performance asphalt pavement recycling agent according to claim 1, wherein:
the activating component is prepared by mixing 1, 4-butanediol, 1, 5-pentanediol, ethylene glycol ethyl ether acetate and 1-octanol according to the weight ratio of 1:2:0.5: 1;
the penetrating component is prepared by mixing a nonionic wetting agent, a dispersing agent and a wetting dispersing agent according to the weight ratio of 1:2: 1;
the plasticizing component comprises tung oil, palm oil, cedar oil, tea seed oil, dibutyl maleate, dianhydride and catalyst iodine in a weight ratio of 4:2:3:2:1:1: 1;
the modified component is prepared by mixing solid resin, an adhesion promoter and tetrabutyl titanate according to the weight ratio of 2:1: 0.5;
the anti-aging component is prepared by mixing octadecyl 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, 2' -methylene-bis (4-methyl-6-tert-butylphenol) and 2- (4, 6-bis (2, 4-dimethylphenyl) -1,3, 5-triazine-2-yl) -5-octyloxyphenol according to the weight ratio of 2:1: 2.
3. The high-performance asphalt pavement recycling agent according to claim 2, wherein the plasticizing component is prepared by a method comprising the steps of:
uniformly mixing tung oil, palm oil, cedar oil and tea seed oil to obtain a mixture A;
adding the mixture A, dibutyl maleate and succinic anhydride into a reaction kettle, adding catalyst iodine, stirring at the speed of 100rpm, introducing nitrogen, heating to 280 ℃ within 30min, and stirring at constant temperature for reaction for 5 hours;
and step three, cooling to room temperature under the protection of nitrogen after the reaction is finished, filtering out the solid catalyst, collecting oily filtrate, adding petroleum ether with the weight being 2 times that of the oily filtrate, and extracting for 2 times to obtain viscous liquid, namely the plasticizing component.
4. A method for preparing a high-performance asphalt pavement recycling agent, which is characterized by adopting the formula of the high-performance asphalt pavement recycling agent as claimed in any one of claims 1 to 3.
5. The preparation method of the high-performance asphalt pavement recycling agent according to claim 4, characterized in that the method comprises the following specific steps: heating the activated component to 80 deg.C, adding the osmotic component, and shearing at 1000rpm for 10 min; heating to 120 ℃, adding plasticizing components, and shearing at the speed of 3000rpm for 20 min; adding the modified component at constant temperature, and shearing at 3000rpm for 10 min; adding the anti-aging component at constant temperature, and shearing at 3000rpm for 10 min; and then cooling to room temperature to prepare the environment-friendly asphalt pavement regenerant.
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| CN111944321A (en) * | 2020-08-26 | 2020-11-17 | 山东交通学院 | High-toughness semi-fusion functional composite environment-friendly asphalt interface regenerant and preparation method thereof |
| CN116162359A (en) * | 2023-03-03 | 2023-05-26 | 江苏瑞文戴尔交通科技有限公司 | Hypotonic regenerant with deep regeneration and anti-aging capabilities and preparation method thereof |
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