CN110054908B - Biomass material-based regenerated asphalt and preparation method thereof - Google Patents
Biomass material-based regenerated asphalt and preparation method thereof Download PDFInfo
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- CN110054908B CN110054908B CN201910394632.3A CN201910394632A CN110054908B CN 110054908 B CN110054908 B CN 110054908B CN 201910394632 A CN201910394632 A CN 201910394632A CN 110054908 B CN110054908 B CN 110054908B
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- 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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- C08L2205/00—Polymer mixtures characterised by other features
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- C08L2205/00—Polymer mixtures characterised by other features
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Abstract
The invention discloses biomass material-based regenerated asphalt which comprises the following raw materials in parts by mass: 30-40 parts of waste asphalt, 10-20 parts of new asphalt, 10-20 parts of wood tar, 3-6 parts of biomass fiber, 3-5 parts of plasticizer, 0.5-1.5 parts of stabilizer and 0.2-0.5 part of compatibilizer. The invention also discloses a preparation method of the biomass material-based recycled asphalt, which comprises two steps of preparing a recycled asphalt initial sample and preparing the recycled asphalt. The biomass material-based regenerated asphalt can effectively recover the road performance of the waste asphalt, particularly obviously improves the oxidation aging resistance and the low-temperature crack resistance of the waste asphalt, and has the advantages of simple preparation process, easy operation and low preparation cost.
Description
Technical Field
The invention belongs to the field of new materials, also relates to the field of sustainable recycling of wastes, and particularly relates to biomass material-based recycled asphalt and a preparation method thereof.
Background
According to incomplete statistics, about 1.2 million tons of waste asphalt mixture is generated on expressways in China every year, if waste pavement materials (RAP) are recycled and applied to road infrastructure construction and maintenance, waste is changed into valuable, an industrial chain conforming to a recycling economy mode is formed, occupation of waste materials on land and pollution to the environment can be avoided, the requirements of stone, asphalt and cement are reduced, road construction and maintenance cost is reduced, and remarkable social benefits and environmental benefits are achieved.
At present, the recycling of waste asphalt mixtures in China mostly adopts the addition of a regenerant to restore the pavement performance, so that the quality of the asphalt regenerant is very important. The domestic regenerant for asphalt regeneration is generally composed of crude oil distillation products (such as engine oil, diesel oil and lubricating oil) and other mineral oil or resin rich in aromatic hydrocarbon. Although diesel oil and engine oil light oil have good permeation and softening effects on asphalt, the flash point is generally not more than 100 ℃, and the construction safety is poor; the asphalt regenerated by the heavy mineral oil regenerant has unsatisfactory high and low temperature performances and relatively high price; other mineral oil rich in aromatic hydrocarbon can generate a lot of toxic gases in the high-temperature heating process, and the environmental friendliness is poor.
The ageing resistance and the low-temperature crack resistance are the core problems influencing the popularization and the application of the regenerated asphalt (especially in cold areas and under the working condition of high-dosage RAP). The petroleum-based regenerant has poor ageing resistance because the petroleum-based regenerant has high aromatic content and more unsaturated bonds and is easy to generate oxidation reaction to generate carbonyl under the high-temperature condition. In addition, the asphalt is hardened and embrittled due to the aging effect, so that the low-temperature bonding strength and ductility of the waste asphalt are seriously influenced, and the conventional asphalt regenerant has poor bonding effect, so that the prepared regenerated asphalt has poor low-temperature performance.
As a typical biomass material, the main components of the wood tar are straight-chain alkane and derivatives thereof, the wood tar has the characteristics of high flash point, high yield, low price and the like, has strong oxidation resistance, and has remarkable advantages when being used for preparing regenerated asphalt.
Meanwhile, the biomass fiber stabilizer is an important admixture for preparing high-performance asphalt, and is increasingly favored by researchers of novel materials and industrial enterprises due to the characteristics of low price, reproducibility, low pollution and wide sources. The biomass fiber has high tensile strength and large elastic modulus, and can greatly improve the high-temperature stability, low-temperature crack resistance, fatigue resistance and the like of the regenerated asphalt, so that the service life of the regenerated asphalt is greatly prolonged.
Disclosure of Invention
In view of the problems in the prior art, a first object of the present invention is to provide a biomass material-based recycled asphalt having excellent aging resistance and low-temperature crack resistance, and good workability in construction.
The second purpose of the invention is to provide a preparation method of biomass material-based regenerated asphalt, which is simple, easy to operate, energy-saving, environment-friendly and low in preparation cost, and can obviously improve the pavement performance of waste asphalt.
In order to realize the purpose, the invention adopts the technical scheme that:
a biomass material-based regenerated asphalt comprises the following raw materials (by mass portion): 30-40 parts of waste asphalt, 10-20 parts of new asphalt, 10-20 parts of wood tar, 3-6 parts of biomass fiber, 3-5 parts of plasticizer, 0.5-1.5 parts of stabilizer and 0.2-0.5 part of compatibilizer.
Further, the biomass material-based regenerated asphalt comprises the following raw materials (in parts by mass): 30-35 parts of waste asphalt, 15-20 parts of new asphalt, 15-20 parts of wood tar, 4-5 parts of biomass fiber, 3.5-4 parts of plasticizer, 0.8-1.0 part of stabilizer and 0.3-0.4 part of compatibilizer.
Further, the waste asphalt is as follows: aged asphalt recovered from waste asphalt pavement materials by solvent extraction and rotary evaporation methods; the new asphalt is 70# base asphalt.
Furthermore, the water content of the wood tar is less than 5 percent, and the content of cresol is more than 10 percent.
Further, the biomass fiber is taken from bamboo and wood residues, mainly is modified flocculent fiber prepared from stems or barks of moso bamboo and wood, the length is 400-2000 mu m, the relative density is 0.91-0.95, and the water content is less than 3%.
Further, the plasticizer is dioctyl phthalate; the stabilizer is lauryl propylene diamine; the compatibilizer is maleic anhydride or maleic anhydride graft.
A preparation method of biomass material-based regenerated asphalt comprises the following steps:
(1) mixing new asphalt and waste asphalt according to the proportion, heating, sequentially adding wood tar and biomass fiber into the heated mixed asphalt, and shearing and stirring to obtain a regenerated asphalt initial sample;
(2) and (2) sequentially adding a plasticizer, a stabilizer and a compatibilizer into the regenerated asphalt initial sample obtained in the step (1), and stirring to obtain the regenerated asphalt.
Further, the heating temperature in the step (1) is 150-160 ℃; the shearing rate is 1500-2500 r/min, and the shearing time is 15-25 min; the stirring time is 15-25 min.
Further, the stirring time in the step (2) is 10-20 min.
The invention has the beneficial effects that: (1) the raw material component of the wood tar adopted by the invention plays the role of an anti-aging agent and a compatibilizer in the regenerated asphalt. As the wood tar contains rich cresol, the wood tar has obvious thermo-oxidative aging resistance, thereby being beneficial to inhibiting the further aging of the regenerated asphalt. Meanwhile, as biomass tar, wood tar contains a large amount of ester, hydroxyl derivatives and epoxy groups, so that the wood tar can form hydrogen bonds and van der waals force with components in the asphalt, further the crosslinking degree among the regenerated asphalt molecules is enhanced, and the adhesive property and the thermal stability of the regenerated asphalt are improved;
(2) the biomass fibers have remarkable toughening and crack resistance effects, the modified bamboo-wood composite fibers can enhance the bonding between the waste asphalt and the new asphalt and other additives through the bridging effect, and establish a stable spatial three-dimensional network structure in the regenerated asphalt, so that the connection effect among the components of the regenerated asphalt is tighter, the compatibility between the wood tar and the aged asphalt is improved, the elastic function of the regenerated asphalt is synergistically improved, and finally the low-temperature crack resistance of the regenerated asphalt is remarkably improved; the characteristics of low price, reproducibility, low pollution and wide sources make the regenerated asphalt increasingly popular with researchers of novel materials and industrial enterprises, the biomass fiber has high tensile strength and large elastic modulus, the high-temperature stability, low-temperature crack resistance and fatigue resistance of the regenerated asphalt can be greatly improved, and the service life of the regenerated asphalt is greatly prolonged;
(3) the stabilizer added in the invention is lauryl propylene diamine, which is used for neutralizing part of unreacted plasticizer and avoiding excessive crosslinking;
(4) the biomass material-based regenerated asphalt has stable performance, particularly excellent ageing resistance and low-temperature crack resistance; and the preparation method is simple, easy to operate, low in cost, environment-friendly in process and wide in application prospect.
Detailed Description
For a better understanding of the present invention, embodiments of the present invention are described in detail below with reference to examples, but those skilled in the art will understand that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention.
The raw materials used in the following examples are as follows:
the waste asphalt is aged asphalt recovered from recycled waste asphalt pavement materials (RAP) by a solvent extraction method, and the technical indexes of the waste asphalt are shown in Table 1.
TABLE 1 technical index of waste asphalt
The new asphalt is high-enriched 70# matrix asphalt produced by the Correct petrochemical company Limited in the Ministry of China, and the technical indexes are shown in a table 2.
TABLE 2 technical indices of the novel asphalts
The wood tar is obtained from an environment-friendly charcoal factory at you county, Taoism City, Hunan province, and is prepared from Phyllostachys pubescens, wherein the water content of the wood tar is less than 5%, and the content of cresol is more than 10%.
The biomass fiber is modified flocculent fiber prepared from stems or barks of moso bamboos and woods self-made in a laboratory, the length is 400-2000 mu m, the relative density is 0.91-0.95, and the water content is less than 3%; the composition of the inorganic elements is shown in Table 3.
TABLE 3 composition of inorganic element components of Biomass fiber
The plasticizer dioctyl phthalate, the stabilizer lauryl trimethylene diamine and the compatibilizer maleic anhydride are all purchased from Changsha Gilles de Kuo instruments, Inc., and are analytically pure.
Example 1:
a biomass material-based regenerated asphalt comprises the following raw materials (by mass portion): 30 parts of waste asphalt, 20 parts of new asphalt, 15 parts of wood tar, 5 parts of biomass fiber, 3.5 parts of plasticizer, 0.8 part of stabilizer and 0.3 part of compatibilizer.
A preparation method of biomass material-based regenerated asphalt comprises the following steps: (1) mixing new asphalt and waste asphalt in proportion, heating to 160 ℃, sequentially adding wood tar and biomass fiber into the heated mixed asphalt, shearing at the speed of 2000r/min for 20min, and stirring for 20min to obtain a regenerated asphalt primary sample; (2) and (2) sequentially adding a plasticizer, a stabilizer and a compatibilizer into the regenerated asphalt initial sample obtained in the step (1), and stirring for 15min to obtain the regenerated asphalt.
Example 2:
a biomass material-based regenerated asphalt comprises the following raw materials (by mass portion): 40 parts of waste asphalt, 20 parts of new asphalt, 15 parts of wood tar, 6 parts of biomass fiber, 5.0 parts of plasticizer, 1.0 part of stabilizer and 0.4 part of compatibilizer.
A preparation method of biomass material-based regenerated asphalt comprises the following steps: (1) mixing new asphalt and waste asphalt in proportion, heating to 160 ℃, sequentially adding wood tar and biomass fiber into the heated mixed asphalt, shearing at the speed of 2500r/min for 25min, and stirring for 25min to obtain a regenerated asphalt primary sample; (2) and (2) sequentially adding a plasticizer, a stabilizer and a compatibilizer into the regenerated asphalt initial sample obtained in the step (1), and stirring for 20min to obtain the regenerated asphalt.
Example 3:
a biomass material-based regenerated asphalt comprises the following raw materials (by mass portion): 30 parts of waste asphalt, 10 parts of new asphalt, 10 parts of wood tar, 3 parts of biomass fiber, 3.0 parts of plasticizer, 0.5 part of stabilizer and 0.2 part of compatibilizer.
A preparation method of biomass material-based regenerated asphalt comprises the following steps: (1) mixing new asphalt and waste asphalt according to a certain proportion, heating to 150 ℃, sequentially adding wood tar and biomass fibers into the heated mixed asphalt, shearing at a speed of 1500r/min for 15min, and stirring for 15min to obtain a regenerated asphalt primary sample; (2) and (2) sequentially adding a plasticizer, a stabilizer and a compatibilizer into the regenerated asphalt initial sample obtained in the step (1), and stirring for 10min to obtain the regenerated asphalt.
Example 4:
a biomass material-based regenerated asphalt comprises the following raw materials (by mass portion): 35 parts of waste asphalt, 15 parts of new asphalt, 15 parts of wood tar, 4 parts of biomass fiber, 4.0 parts of plasticizer, 1.0 part of stabilizer and 0.4 part of compatibilizer.
A preparation method of biomass material-based regenerated asphalt comprises the following steps: (1) mixing new asphalt and waste asphalt in proportion, heating to 160 ℃, sequentially adding wood tar and biomass fiber into the heated mixed asphalt, shearing at the speed of 2000r/min for 20min, and stirring for 20min to obtain a regenerated asphalt primary sample; (2) and (2) sequentially adding a plasticizer, a stabilizer and a compatibilizer into the regenerated asphalt initial sample obtained in the step (1), and stirring for 15min to obtain the regenerated asphalt.
Example 5:
a biomass material-based regenerated asphalt comprises the following raw materials (by mass portion): 40 parts of waste asphalt, 20 parts of new asphalt, 20 parts of wood tar, 6 parts of biomass fiber, 5.0 parts of plasticizer, 1.5 parts of stabilizer and 0.5 part of compatibilizer.
A preparation method of biomass material-based regenerated asphalt comprises the following steps: (1) mixing new asphalt and waste asphalt in proportion, heating to 155 ℃, sequentially adding wood tar and biomass fiber into the heated mixed asphalt, shearing at the speed of 2500r/min for 25min, and stirring for 25min to obtain a regenerated asphalt primary sample; (2) and (2) sequentially adding a plasticizer, a stabilizer and a compatibilizer into the regenerated asphalt initial sample obtained in the step (1), and stirring for 20min to obtain the regenerated asphalt.
The recycled asphalt binders of the above examples were tested according to the standard method specified in "road engineering asphalt and asphalt mixture test protocol" (JTG E20-2011) of the ministry of transportation in china for testing the penetration, softening point, ductility, viscosity, and bending creep stiffness, and the test results are shown in table 4.
TABLE 4 comparison of properties of reclaimed and virgin asphalts for each example
As can be seen from Table 4, the biomass material-based recycled asphalt has a good recycling effect; the penetration degree and the viscosity of each embodiment show that the biomass material-based regenerated asphalt has good construction workability; the results of the residual penetration ratio and the aging index show that the biomass material-based regenerated asphalt has better aging resistance than the new asphalt; meanwhile, the results of 15 ℃ ductility and-12 ℃ bending creep stiffness show that the biomass material-based recycled asphalt has excellent low-temperature crack resistance and can effectively prolong the service life of the recycled asphalt pavement.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above-described embodiments. Those skilled in the art should appreciate that many modifications and variations are possible in light of the above teaching without departing from the scope of the invention.
Claims (6)
1. The biomass material-based regenerated asphalt is characterized by comprising the following raw materials: 30-40 parts of waste asphalt, 10-20 parts of new asphalt, 10-20 parts of wood tar, 3-6 parts of biomass fiber, 3-5 parts of plasticizer, 0.5-1.5 parts of stabilizer and 0.2-0.5 part of compatibilizer; the water content of the wood tar is less than 5 percent, and the content of cresol is more than 10 percent; the biomass fiber is taken from bamboo and wood residues, mainly is modified flocculent fiber prepared from stems or barks of moso bamboo and wood, has the length of 400-2000 mu m, the relative density of 0.91-0.95 and the water content of less than 3 percent; the plasticizer is dioctyl phthalate; the stabilizer is lauryl propylene diamine; the compatibilizer is maleic anhydride or maleic anhydride graft.
2. The biomass material-based reclaimed asphalt of claim 1, which comprises the following raw materials: 30-35 parts of waste asphalt, 15-20 parts of new asphalt, 15-20 parts of wood tar, 4-5 parts of biomass fiber, 3.5-4 parts of plasticizer, 0.8-1.0 part of stabilizer and 0.3-0.4 part of compatibilizer.
3. The biomass material-based reclaimed asphalt of claim 1 or 2, wherein the waste asphalt is: aged asphalt recovered from waste asphalt pavement materials by solvent extraction and rotary evaporation methods; the new asphalt is 70# base asphalt.
4. A method for preparing a biomass material-based reclaimed asphalt according to any of claims 1 to 3, comprising the steps of:
(1) mixing new asphalt and waste asphalt according to the proportion, heating, sequentially adding wood tar and biomass fiber into the heated mixed asphalt, and shearing and stirring to obtain a regenerated asphalt initial sample;
(2) and (2) sequentially adding a plasticizer, a stabilizer and a compatibilizer into the regenerated asphalt initial sample obtained in the step (1), and stirring to obtain the regenerated asphalt.
5. The preparation method of the biomass material-based reclaimed asphalt as claimed in claim 4, wherein the heating temperature in the step (1) is 150-160 ℃; the shearing rate is 1500-2500 r/min, and the shearing time is 15-25 min; the stirring time is 15-25 min.
6. The preparation method of biomass material-based reclaimed asphalt according to claim 4, wherein the stirring time in the step (2) is 10-20 min.
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| CN112430011B (en) * | 2020-12-05 | 2022-10-11 | 广东碧磊建筑工程有限公司 | Preparation process of asphalt mixture |
| 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 |
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| CN102766340A (en) * | 2012-08-13 | 2012-11-07 | 交通运输部公路科学研究所 | Modified biological asphalt material, biological asphalt mixture, preparation method thereof and applications |
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| WO2001059008A1 (en) * | 2000-02-08 | 2001-08-16 | Waste Technology Transfer, Inc. | Petroleum asphalts modified by liquefied biomass additives |
| CN102766340A (en) * | 2012-08-13 | 2012-11-07 | 交通运输部公路科学研究所 | Modified biological asphalt material, biological asphalt mixture, preparation method thereof and applications |
| CN103436038A (en) * | 2013-07-16 | 2013-12-11 | 交通运输部公路科学研究所 | Waste and old road asphalt regenerating agent and preparation method thereof |
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Non-Patent Citations (1)
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