CN111548635A - Regenerant suitable for thermal regeneration of old asphalt pavement in cold region and preparation method thereof - Google Patents
Regenerant suitable for thermal regeneration of old asphalt pavement in cold region and preparation method thereof Download PDFInfo
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- CN111548635A CN111548635A CN202010515889.2A CN202010515889A CN111548635A CN 111548635 A CN111548635 A CN 111548635A CN 202010515889 A CN202010515889 A CN 202010515889A CN 111548635 A CN111548635 A CN 111548635A
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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
- C08L91/00—Compositions of oils, fats or waxes; Compositions of derivatives thereof
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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
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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Abstract
The invention relates to a regenerant suitable for thermal regeneration of an old asphalt pavement in a cold area, which comprises the following components in parts by weight: 95-105 parts of aromatic oil; 25-35 parts of a plasticizer and a low-temperature agent; 2.5-3.5 parts of a binder; 0.5-1.5 parts of diluent. The invention relates to a regenerant suitable for thermal regeneration of old asphalt pavement in cold regions, and dioctyl adipate DOA is adopted to replace conventional dibutyl phthalate DBP and dioctyl phthalate DOP as a plasticizer, so that compared with DBP and DOP, the toxicity of DOA is greatly reduced, and the safety and the environmental protection of the regenerant are improved; meanwhile, the regeneration performance, especially the low-temperature ductility performance of the regenerated asphalt is obviously superior to that of the asphalt regenerant on the common market. The dioctyl adipate DOA is used as a plasticizer and a modifier, the product can improve the toughness component of aged asphalt, enhance the low-temperature ductility of the asphalt, has excellent cold resistance, endows the product with excellent low-temperature flexibility, and has certain light and heat stability and water resistance.
Description
Technical Field
The application relates to the technical field of road maintenance, modification and upgrading, in particular to a regenerant for thermal regeneration of an asphalt pavement and a preparation method thereof.
Background
In recent years, the highway construction in China is rapidly developed, and the development and planning of a modern comprehensive transportation system point out that the highway network is perfected, the total mileage of a traffic highway reaches 500 kilometers in 2020, and meanwhile, the capacity expansion and transformation work of the national highway with early construction age and heavy traffic is promoted. And meanwhile, the green development of traffic transportation is promoted in the planning, the energy-saving and low-carbon development is promoted, the ecological protection and pollution prevention are enhanced, and the intensive and economical utilization of resources is promoted. In engineering construction, the comprehensive utilization of materials such as waste road surfaces, dredged soil, steel rails, tires, asphalt and the like, and industrial waste and construction waste after harmless treatment is encouraged. Therefore, the national highway construction has shifted from the simple large-scale construction to the stage of combining new construction and maintenance, and the application of the asphalt pavement recycling technology becomes important.
The winter severe cold regions such as northern inner Mongolia and northeast regions are influenced by factors such as longitude and latitude, the climate characteristics are long due to cold winter, and the old asphalt pavement is regenerated, so that the requirement on the low-temperature performance of the regenerated asphalt mixture is high. At present, an effective technology for improving the low-temperature performance of the recycled asphalt mixture in a cold area is lacked.
Disclosure of Invention
The application provides a regenerant suitable for hot regeneration of an old asphalt pavement in a cold area and a preparation method thereof, which are used for solving the problem that the low-temperature performance of a regenerated asphalt mixture in the cold area lacks an effective technology.
The technical scheme adopted by the application is as follows:
the invention provides a regenerant suitable for thermal regeneration of an old asphalt pavement in a cold region, which is characterized by comprising the following components in parts by weight:
aromatic oils;
a plasticizer;
a low temperature modifier;
a thickener;
a diluent;
the ratio of the aromatic oil to the plasticizer to the low-temperature agent to the thickener to the diluent is 100:30:3: 1.
Further, the aromatic oil is one or a combination of more of furfural extract oil and linseed oil.
Further, the plasticizer and the low-temperature modifier are specifically dioctyl adipate (DOA).
Further, the thickener is specifically a petroleum resin.
Further, the diluent is one or a combination of more of turpentine and rubber oil.
Further, the preparation method of the regenerant suitable for the thermal regeneration of the old asphalt pavement in the cold region is characterized by comprising the following steps of:
stirring and heating furfural extract oil at the temperature of 100-130 ℃;
adding C9 petroleum resin, and shearing and stirring at a high speed, wherein the rotating speed is 1900-2100 r/min, and the time is 5-15 min;
keeping the temperature, adding dioctyl adipate (DOA) and turpentine, and continuously shearing for 5-15 min to form a stable mixed solution, thus obtaining a finished product.
The technical scheme of the application has the following beneficial effects:
the invention relates to a regenerant suitable for hot regeneration of old asphalt pavement in cold regions and a preparation method thereof.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is an infrared spectrum of undisturbed asphalt in structural analysis;
FIG. 2 is an infrared spectrum of aged asphalt in structural analysis;
FIG. 3 is an infrared spectrum of a regenerant in a structural analysis;
FIG. 4 is an infrared spectrum of a regenerated asphalt in a structural analysis;
FIG. 5 is a comparison graph of mid-IR spectra for structural analysis.
Detailed Description
Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following examples do not represent all embodiments consistent with the present application. But merely as exemplifications of systems and methods consistent with certain aspects of the application, as recited in the claims.
In the use process of the asphalt pavement, the asphalt is aged, macroscopically shows that the elasticity is lost, the viscosity is increased, the brittleness is increased, the asphalt is separated from aggregates, and the pavement is damaged. The main causes of asphalt aging are due to component misalignment, which manifests as a decrease in saturates, conversion of aromatic components to gums, and conversion of gums to asphaltenes. The regenerant is mainly used for realizing asphalt regeneration by adding low-viscosity oil and colloid components to blend components of aged asphalt.
The application provides a regenerant suitable for hot regeneration of old asphalt pavement in cold areas, which comprises the following components in parts by weight:
aromatic oil, plasticizer, low-temperature modifier, thickener and diluent; the ratio of the aromatic oil to the plasticizer to the low-temperature agent to the thickener to the diluent is 100:30:3: 1.
The aromatic oil is one or more of furfural extract oil and linseed oil.
The plasticizer and low temperature modifier is dioctyl adipate (DOA).
The thickener is petroleum resin.
The diluent is one or more of turpentine and rubber oil.
A method for preparing the regenerant suitable for hot recycling of old asphalt pavement in cold regions, comprising the steps of:
stirring and heating aromatic oil at 100-130 deg.c;
adding petroleum resin, and shearing and stirring at a high speed, wherein the rotating speed is 1900-2100 r/min, and the time is 5-15 min;
keeping the temperature, adding dioctyl adipate (DOA) and a diluent, and continuously shearing for 5-15 min to form a stable mixed solution, thus obtaining a finished product.
Example 1
Firstly, weighing a regenerant formula (in parts by weight): 100g of furfural extract oil, 30g of dioctyl adipate (DOA), 3g of turpentine and 1g of petroleum resin.
Secondly, firstly stirring and heating furfural extract oil to about 120 ℃, adding petroleum resin, shearing and stirring at a high speed of 2000r/min for 10min, then keeping the temperature, adding dioctyl adipate DOA and turpentine, and continuously shearing for 10min to form a stable mixed solution.
The performance tests were performed on the regenerants of the examples and the results are shown in Table 1 below. It can be seen from the table that the technical requirements of the regenerant all meet the requirements of RA-5 type regenerant in technical Specification for regenerating road asphalt pavement.
TABLE 1 regenerant test results
The regenerant of the embodiment is used for regenerating the recycled asphalt of the asphalt pavement in the cold region and the asphalt of two types of laboratory simulated aging, and the regeneration effect is shown in table 2.
TABLE 2 rejuvenation effect of rejuvenating agents on different bitumens
As can be seen from Table 2, the regenerant has good regeneration effect on both project recycled asphalt and laboratory self-made aged asphalt (SKA-90 and Claritia A-90), and can restore the performance level of the aged asphalt to the original asphalt, particularly in the aspect of ductility, not only can restore the ductility of the old asphalt, but also has certain modification effect, so that the ductility of the old asphalt greatly exceeds the level of the original asphalt. Analysis shows that the regenerant of the embodiment meets the requirement of regenerated asphalt, so that the ductility at 10 ℃ is greatly improved, and the regenerant has good adaptability to asphalt regeneration in cold regions.
Regenerated SKA-90 asphalt is aged by a rotary film oven, whether the durability of the regenerated SKA-90 asphalt meets the requirements of technical Specification for road asphalt pavement construction (JTG F-40-2004) is verified, and the test results are shown in Table 3.
TABLE 3 ageing test results of recycled asphalt rotary film oven
It can be seen from table 3 that after the regenerated asphalt is aged, the residual penetration ratio, the residual ductility and the mass change all meet the requirements of the specification, the viscosity ratio and the mass change can effectively reflect the aging resistance of the asphalt, and it can be seen from table 3 that the viscosity ratio before and after the regenerated asphalt is aged is only 1.36, the growth range is not large, and the mass change also meets the requirements of the specification. Through the analysis, the regenerant has better aging resistance.
Analysis of regeneration principle of regenerant of the present invention
1) Analysis of composition
Four components before and after the SK A-90 asphalt is aged and after regeneration are measured, and the recovery effect of the regenerant on the components is analyzed, and the table 4 shows.
TABLE 4 four-component comparison before and after regeneration of bitumen SK90#
As can be seen from Table 4, the contents of aromatic components and saturated components of the asphalt are greatly supplemented after the regenerant is added, the contents of colloid and asphaltene are also reduced, so that the components of the regenerated asphalt are restored to the equilibrium state, but the contents of four components are not restored to the original level compared with the new asphalt.
Because the contents of the four components of the regenerant and the aged asphalt are measured, and the doping amount of the regenerant is 10 percent of the mass of the aged asphalt, the contents of the four components of the regenerated asphalt can be calculated, and a calculation formula is shown as formula 1. As can be seen from the analysis, the measured values of the contents of the aromatic fraction and the saturated fraction are slightly larger than the calculated values, while the contents of the asphaltenes are smaller than the calculated values. The regeneration agent is not simply added with the aged asphalt components in the regeneration process, and a certain dissolution reaction is also carried out, so that the effect of capacity increase is achieved in the aged asphalt, the solubility parameter difference between the asphaltene and the soft asphaltene is reduced, asphaltene molecular groups in the aged asphalt are dispersed and dissolved, the measured value of the light oil in the regenerated asphalt is higher than the calculated value, and the calculated value of the heavy component is lower than the calculated value.
y＝(a+bx)/(1+x) (1)
a-the content (%) of the components in the aged asphalt;
b-content (%) of the component in the regenerant;
x-regenerant doping (%);
y-reclaimed asphalt component content (%).
2) Structural analysis
SKA-90 asphalt is still used as a research object, infrared spectrum tests are carried out on the self-made regenerant and the regenerated asphalt, and the infrared spectrum tests are combined with the infrared spectrograms before and after SKA-90 aging for analysis, and the infrared spectrograms are shown in figures 1 to 5.
As can be seen from the infrared spectrum of the regenerant, the regenerant was at 2922cm-1、2854cm-1The sum of the peak of C-H stretching vibration and 1460cm-1、1370cm-1The C-H corner of the (C-H) is vibrated, which indicates that the regenerant contains saturated alkane functional groups; at 1600cm-1The peak of stretching vibration of the skeleton of the aromatic ring is shown at 2955cm-1C-H stretching vibration peaks on benzene rings show that the regenerant is rich in light components of aromatic hydrocarbons; at 1740cm-1Saturated fatty acid ester C ═ O stretching vibration peak and 1170cm-1Of (CH)3)2C-C of CHR2Antisymmetric stretching vibration peak, which shows that the regenerant contains a surfactant with one end composed of a hydrophilic group (polar part) and one end composed of a hydrophobic agent (non-polar part).
To quantitatively calculate the change in aged asphalt functionality, the carbonyl index (I) was introducedC＝O) And index of sulfoxide group (I)S＝O) And the calculation mode is shown in formulas (2) and (3).
To further understand the carbonyl and sulfoxide groups of the regenerant on the aged pitch productsCalculating the carbonyl and sulfoxide index of the reclaimed asphalt, wherein the carbonyl index IC＝OIs 0.01132, sulfoxide group index IS＝OIs 0.06731. Carbonyl index I of comparative aged asphaltC＝OIs 0.04213, sulfoxide group index IS＝O0.15107, indicating a significant decrease in both the carbonyl and sulfoxide indices of the reclaimed asphalt; sulfoxide group index I of comparative undisturbed asphalt and regenerated asphaltS＝O0.06731, while the sulfoxide index of the original asphalt is 0.10625, compared with the sulfoxide index of the regenerated asphalt. Indicating that a chemical reaction exists between the regenerant and the aged asphalt, reducing carbonyl and sulfoxide groups to some extent.
This example provides a regenerant for thermal regeneration of asphalt pavement, the regeneration mechanism of which is: 1) the soft component in the asphalt is supplemented, and the asphalt and the aged asphalt component are dissolved to a certain extent, so that the solubility parameter difference between the asphaltene and the soft asphaltene is reduced, and the asphaltene molecular groups in the aged asphalt are dispersed and dissolved; 2) in addition, chemical reaction is carried out to a certain extent, and carbonyl and sulfoxide groups are reduced to a certain extent; 3) and an interfacial film is formed in the asphaltene and the soft asphaltene of the aged asphalt, so that the movement capability among the aged asphalt molecules is enhanced. Aiming at the problem of poor low-temperature performance of a regenerated asphalt mixture in cold regions, dioctyl adipate DOA is used as a plasticizer and a modifier, the dioctyl adipate DOA can improve the toughness component of aged asphalt, enhances the low-temperature ductility of the asphalt, has excellent cold resistance, endows the product with excellent low-temperature flexibility, and has certain light, thermal stability and water resistance.
Comparative example 1
Firstly, weighing a regenerant formula (in parts by weight): 100g of furfural extract oil, 30g of dibutyl phthalate DBP, 3g of turpentine and 1g of petroleum resin.
Secondly, firstly stirring and heating furfural extract oil to about 120 ℃, adding petroleum resin, shearing and stirring at a high speed of 2000r/min for 10min, then keeping the temperature, adding dibutyl phthalate DBP and turpentine, and continuously shearing for 10min to form a stable mixed solution.
Comparative example 2
Firstly, weighing a regenerant formula (in parts by weight): 100g of furfural extract oil, 30g of dioctyl phthalate DOP, 3g of turpentine and 1g of petroleum resin.
Secondly, firstly stirring and heating the furfural extract oil to about 120 ℃, adding petroleum resin, shearing and stirring at a high speed of 2000r/min for 10min, then keeping the temperature, adding dioctyl phthalate DOP and turpentine, and continuously shearing for 10min to form a stable mixed solution.
Different from the examples, the comparative examples 1 and 2 adopt dibutyl phthalate DBP and dioctyl phthalate DOP as plasticizers, so that the toxicity is greatly enhanced, and the environmental protection and safety are reduced.
According to the invention, dioctyl adipate DOA is adopted to replace conventional dibutyl phthalate DBP and dioctyl phthalate DOP as plasticizers, compared with DBP and DOP, the toxicity of DOA is greatly reduced, and the safety and environmental friendliness of the regenerant are improved; meanwhile, the regeneration performance, especially the low-temperature ductility performance of the regenerated asphalt is obviously superior to that of the asphalt regenerant on the general market.
The embodiments provided in the present application are only a few examples of the general concept of the present application, and do not limit the scope of the present application. Any other embodiments extended according to the scheme of the present application without inventive efforts will be within the scope of protection of the present application for a person skilled in the art.
Claims (6)
1. The regenerant suitable for thermal regeneration of old asphalt pavement in cold regions is characterized by comprising the following components in parts by weight:
aromatic oils;
a plasticizer;
a low temperature modifier;
a thickener;
a diluent;
the ratio of the aromatic oil to the plasticizer to the low-temperature agent to the thickener to the diluent is 100:30:3: 1.
2. The recycling agent for hot recycling of old asphalt pavement in cold regions according to claim 1, wherein: the aromatic oil is one or more of furfural extract oil and linseed oil.
3. The recycling agent for hot recycling of old asphalt pavement in cold regions according to claim 1, wherein: the plasticizer and the low-temperature modifier are dioctyl adipate (DOA).
4. The recycling agent for hot recycling of old asphalt pavement in cold regions according to claim 1, wherein: the thickening agent is petroleum resin.
5. The recycling agent for hot recycling of old asphalt pavement in cold regions according to claim 1, wherein: the diluent is one or more of turpentine and rubber oil.
6. A preparation method of the regenerant suitable for hot recycling of old asphalt pavement in cold regions according to any one of claims 1 to 5, wherein the preparation method comprises the following steps:
stirring and heating aromatic oil at 100-130 deg.c;
adding petroleum resin, and shearing and stirring at a high speed, wherein the rotating speed is 1900-2100 r/min, and the time is 5-15 min;
keeping the temperature, adding dioctyl adipate (DOA) and a diluent, and continuously shearing for 5-15 min to form a stable mixed solution, thus obtaining a finished product.
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| CN115029006A (en) * | 2022-06-24 | 2022-09-09 | 南京林业大学 | Asphalt regenerant and preparation method and using method thereof |
| CN115717033A (en) * | 2022-11-30 | 2023-02-28 | 新疆交通科学研究院有限责任公司 | High-permeability pavement coating material capable of recovering pavement aging asphalt performance and resisting ice condensation |
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Application publication date: 20200818 |
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| RJ01 | Rejection of invention patent application after publication |