CN115612306B - Composite modified asphalt and preparation method thereof - Google Patents

Composite modified asphalt and preparation method thereof Download PDF

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CN115612306B
CN115612306B CN202211414087.8A CN202211414087A CN115612306B CN 115612306 B CN115612306 B CN 115612306B CN 202211414087 A CN202211414087 A CN 202211414087A CN 115612306 B CN115612306 B CN 115612306B
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modified asphalt
betel nut
asphalt
ppa
temperature
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CN115612306A (en
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周育名
俱浩龙
魏建国
李平
赵勖丞
肖淼林
彭竹仪
余帆
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Changsha University of Science and Technology
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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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/32—Phosphorus-containing compounds
    • C08K2003/329—Phosphorus containing acids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/08—Stabilised against heat, light or radiation or oxydation
    • 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
    • C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
    • C08L2205/16—Fibres; Fibrils

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  • Civil Engineering (AREA)
  • Materials Engineering (AREA)
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  • Chemical Kinetics & Catalysis (AREA)
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  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Working-Up Tar And Pitch (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

The invention provides composite modified asphalt and a preparation method thereof, and belongs to the field of asphalt modification. The preparation method provided by the invention comprises the following steps: (1) Pretreating betel nut dregs to obtain betel nut dreg fibers; (2) Modifying asphalt by using a PPA modifier to obtain PPA modified asphalt; the mixing amount of the PPA modifier is 0.8-1.5wt%; (3) Mixing the betel nut residue fibers obtained in the step (1) with the PPA modified asphalt obtained in the step (2) to obtain composite modified asphalt; the mixing amount of the waste betel nut dreg fibers is 1-4wt%; the steps (1) and (2) are not in sequence. The penetration (0.1 mm) of the composite modified asphalt provided by the invention is 47, the softening point is 57.6 ℃, the ductility at 10 ℃ is 94.8mm, and the composite modified asphalt has good high-temperature performance and low-temperature performance, and is beneficial to large-scale application of PPA modifier and recycling of waste materials.

Description

Composite modified asphalt and preparation method thereof
Technical Field
The invention relates to the field of asphalt modification, in particular to composite modified asphalt and a preparation method thereof.
Background
The asphalt pavement has the characteristics of noise reduction, convenient maintenance, recoverability, good skid resistance, high stability, good water damage resistance and the like. With the increasing exhaustion of petroleum resources and advances in oil refining technology, the yield and quality of asphalt have decreased, resulting in increased asphalt costs, and ever-increasing cost and environmental concerns have forced researchers to find materials that can be continuously regenerated to replace petroleum asphalt products, or to improve asphalt performance by modification.
Polyphosphoric Acid (PPA) is often used for completely or partially replacing a polymer modifier in the preparation of modified asphalt due to low price and good modification effect, but the PPA modified asphalt has remarkable high-temperature performance improvement and insignificant low-temperature performance improvement effect, and meanwhile, it is difficult to simultaneously improve all the performances of matrix asphalt by using a single modifier, so that the overall performance cannot be improved well.
Currently, betel nuts are used as a snack and a medicine for 6-12 hundred million people worldwide, and in China, betel nuts become an industry of up to about 100 hundred million dollars, but the betel nuts after chewing are not timely processed, so that mosquitoes and bacteria are easily bred, and certain influence is caused on the environment and human health. And the natural fiber has research value compared with basalt fiber, glass fiber, polyester fiber and other chemical fiber due to the characteristics of recoverability, biodegradability, low cost and the like of betel nuts.
Therefore, how to reduce the influence of PPA modifier on the low temperature performance of asphalt, and further improve the comprehensive performance of modified asphalt, becomes a technical problem to be solved in the field.
Disclosure of Invention
The invention aims to provide composite modified asphalt and a preparation method thereof. The composite modified asphalt provided by the invention has good high-temperature and low-temperature performances.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a preparation method of composite modified asphalt, which comprises the following steps:
the preparation method of the composite modified asphalt comprises the following steps:
(1) Pretreating betel nut dregs to obtain betel nut dreg fibers;
(2) Modifying asphalt by using a PPA modifier to obtain PPA modified asphalt; the mixing amount of the PPA modifier is 0.8-1.5wt%;
(3) Mixing the betel nut residue fibers obtained in the step (1) with the PPA modified asphalt obtained in the step (2) to obtain composite modified asphalt; the mixing amount of the waste betel nut dreg fibers is 1-4wt%;
the steps (1) and (2) are not in sequence.
Preferably, the length of the betel nut dreg fiber in the step (1) is 0.001-1 cm.
Preferably, the pretreatment in step (1) includes: sequentially performing alkaline leaching and acylation treatment on betel nut residues.
Preferably, the alkaline leaching temperature is 60-100 ℃, the alkaline leaching time is 0.5-1 h, and the mass concentration of the alkaline solution used in the alkaline leaching is 2-10%.
Preferably, the alkali solution is NaOH solution, ca (OH) 2 Solution and Na 2 CO 3 One or more of the solutions.
Preferably, the temperature of the acylation treatment is the reflux temperature of the acylation solution, the time of the acylation treatment is 0.5-1 h, and the mass concentration of the acylation solution used in the acylation treatment is 2-10%.
Preferably, the acylating solution is an aqueous solution of one or more of acetic anhydride, benzoyl and acrylic acid.
Preferably, the temperature of the modification in the step (2) is 150-160 ℃, and the modification time is 6-30 min.
Preferably, the temperature of the mixing in the step (3) is 160-180 ℃, and the mixing time is 0.5-1.5 h.
The invention also provides the composite modified asphalt prepared by the preparation method.
The invention provides a preparation method of composite modified asphalt, which comprises the following steps: (1) Pretreating betel nut dregs to obtain betel nut dreg fibers; (2) Modifying asphalt by using a PPA modifier to obtain PPA modified asphalt; the mixing amount of the PPA modifier is 0.8-1.5wt%; (3) Mixing the betel nut residue fibers obtained in the step (1) with the PPA modified asphalt obtained in the step (2) to obtain composite modified asphalt; the mixing amount of the waste betel nut dreg fibers is 1-4wt%; the steps (1) and (2) are not in sequence. According to the invention, the PPA modifier is added into the asphalt, and the addition amount of the PPA modifier is adjusted, so that the high-temperature performance of the asphalt is improved; the betel nut slag fiber is added, and the mixing amount of the betel nut slag fiber is controlled, so that the betel nut slag fiber and PPA modified asphalt have excellent compatibility, and meanwhile, the high-temperature and low-temperature performances of the composite modified asphalt can be remarkably improved. Experimental results show that the penetration (0.1 mm) of the composite modified asphalt prepared by the preparation method of the composite modified asphalt provided by the invention is 46-56, the softening point is 57-60 ℃, the ductility at 10 ℃ is 52-95 mm, and the composite modified asphalt has good high-temperature and low-temperature performances.
Detailed Description
The invention provides a preparation method of composite modified asphalt, which comprises the following steps:
(1) Pretreating betel nut dregs to obtain betel nut dreg fibers;
(2) Modifying asphalt by using a PPA modifier to obtain PPA modified asphalt; the mixing amount of the PPA modifier is 0.8-1.5wt%;
(3) Mixing the betel nut residue fibers obtained in the step (1) with the PPA modified asphalt obtained in the step (2) to obtain composite modified asphalt; the mixing amount of the waste betel nut dreg fibers is 1-4wt%;
the steps (1) and (2) are not in sequence.
The invention pretreats the betel nut dregs to obtain betel nut dregs fiber.
In the present invention, the length of the betel nut dreg fiber is preferably 0.001-1 cm, more preferably 0.001-0.5 cm. The length of the betel nut dreg fibers is limited in the range, so that the betel nut dreg fibers are prevented from being entangled with asphalt when being mixed, and the dispersion of the betel nut dreg fibers in the asphalt is prevented from affecting the high-temperature and low-temperature performance of the asphalt.
In the present invention, the pretreatment preferably includes sequentially subjecting the betel nut dregs to alkaline leaching and acylation treatment.
In the present invention, the alkaline leaching temperature is preferably 60 to 100 ℃, more preferably 70 to 90 ℃, still more preferably 80 ℃; the time of the alkaline leaching is preferably 0.5 to 1h, more preferably 0.5 to 0.7h; the concentration of the alkaline solution used for the alkaline leaching is preferably 2 to 10% by mass, more preferably 4 to 8% by mass, and even more preferably 5% by mass. The concentration of the alkali solution is limited to the range, so that the surface roughness of the plant fiber can be effectively improved. The invention reduces the hygroscopicity of the areca-nut residue fiber through alkaline leaching, damages the originally compact structure of the areca-nut residue fiber, increases the surface roughness and the porosity of the areca-nut residue fiber, further improves the mechanical interlocking effect of the areca-nut residue fiber and the matrix, exposes the cellulose structure, thereby increasing the number of active reaction sites and improving the strength and the rigidity of the areca-nut residue fiber.
In the present invention, the alkali solution is preferably NaOH solution, ca (OH) 2 Solution and Na 2 CO 3 One or more of the solutions. The invention can make the betel nut dreg fiber obtained later have higher strength and rigidity by limiting the type of the alkali solution to the above range.
In the present invention, the alkaline leaching preferably includes the steps of:
1) Sequentially cleaning and drying the betel nut dregs to obtain primary treated betel nut dregs;
2) Immersing the primary treated betel nut slag obtained in the step 1) into an alkali solution, stirring and washing to obtain the alkali-immersed betel nut slag.
The invention preferably carries out cleaning and drying on the betel nut dregs in sequence to obtain the primarily treated betel nut dregs.
In the present invention, the solvent used for the washing is preferably distilled water. The distilled water washing operation is not particularly limited in the present invention, and may be performed by an operation well known to those skilled in the art.
The drying apparatus and the specific operation are not particularly limited in the present invention, and those well known to those skilled in the art may be employed.
After the primary treated betel nut slag is obtained, the primary treated betel nut slag is preferably immersed in an alkali solution for stirring and then washing, so as to obtain the alkali-immersed betel nut slag.
In the present invention, the stirring is preferably performed in a magnetic stirrer; the stirring speed is preferably 2000 to 3000rpm/min, more preferably 2100 to 2500rpm/min.
In the present invention, the solvent used for the washing is preferably distilled water. The operation of washing with distilled water is not particularly limited in the present invention, and may be performed by an operation well known to those skilled in the art. The time for flushing is not particularly limited, and the betel nut dregs are repeatedly flushed until the pH value is 7.
In the present invention, the temperature of the acylation treatment is preferably the reflux temperature of the acylation solution; the time of the acylation treatment is preferably 0.5 to 1 hour, more preferably 0.8 to 1 hour; the mass concentration of the acylation solution used in the acylation treatment is preferably 2 to 10%, more preferably 4 to 8%. According to the invention, the carboxyl in the acylation solution and the hydroxyl on the surface of the plant fiber are subjected to esterification reaction through acylation treatment to replace the hydroxyl on the surface of the fiber, and the interface compatibility with asphalt is improved by improving the hydrophobicity.
In the present invention, the acylating solution is preferably an aqueous solution of one or more of acetic anhydride, benzoyl and acrylic acid. The present invention can further improve the hydrophobicity of the betel palm residue fiber obtained later by limiting the kind of the acylating solution to the above range.
In the present invention, the acylation treatment preferably comprises the steps of:
1) Mixing the alkali-soaked areca slag with an acylation solution to perform an acylation reaction to obtain acylated areca slag;
2) Washing, drying and crushing the acylated areca dregs obtained in the step 1) in sequence to obtain areca dregs fibers.
In the invention, the alkali-soaked areca slag and the acylating solution are mixed for acylation reaction to obtain acylated areca slag.
After the acylated areca-nut dregs are obtained, the acylated areca-nut dregs are preferably washed, dried and crushed in sequence to obtain areca-nut dreg fibers.
In the present invention, the solvent used for the washing is preferably distilled water. The operation of washing with distilled water is not particularly limited in the present invention, and may be performed by an operation well known to those skilled in the art. The time for flushing is not particularly limited, and the betel nut dregs are flushed until the pH value is 7.
In the present invention, the drying is preferably performed in an oven; the temperature of the drying is preferably 100℃or less, more preferably 50 to 80℃and still more preferably 60 ℃. The type of the oven is not particularly limited in the present invention, and the type of the oven known in the art may be adopted. The invention has no special limit to the drying time, and the betel nut dregs are dried until the quality is constant.
In the present invention, the pulverization is preferably performed in a fiber pulverizer.
The PPA modifier is adopted to modify asphalt to obtain PPA modified asphalt.
In the invention, the blending amount of the PPA modifier is preferably 0.8-1.5 wt% based on 100 wt% of asphalt; more preferably 1.0wt%. The present invention can improve the high temperature performance of the base asphalt and reduce the adverse effect on the low temperature performance of the base asphalt by limiting the amount of the PPA modifier to the above range.
In the present invention, the temperature of the modification is preferably 150 to 160 ℃, more preferably 155 ℃; the modification time is preferably 6 to 30 minutes, more preferably 6 to 10 minutes. The present invention can sufficiently modify the matrix asphalt by the PPA modifier by limiting the modification temperature and time to the above-mentioned ranges.
In the invention, the asphalt is preferably heated and stirred, and then PPA modifier is added for modification.
In the present invention, the heating and stirring are preferably performed simultaneously; the heating temperature is preferably 130-150 ℃; the stirring time is preferably 5 to 10 minutes. The stirring operation is not particularly limited, and manual stirring operation is well known to those skilled in the art. The invention uniformly heats and completely dehydrates the matrix asphalt by heating and stirring, and is more beneficial to the subsequent modification.
In the present invention, the modification is preferably performed in a shear emulsifier; the rotation speed of the shearing emulsifying machine is preferably 3000-5000 r/min, more preferably 3000-4000 r/min, and even more preferably 3500r/min. The invention can make the modified asphalt fully and uniformly sheared by limiting the rotating speed of the shearing emulsifying machine to the range, and avoid the reduction of the ductility of the modified asphalt and the deterioration of the temperature sensitivity.
After betel nut dreg fiber and PPA modified asphalt are obtained, the betel nut dreg fiber and the PPA modified asphalt are mixed to obtain the composite modified asphalt.
In the present invention, the blending amount of the betel nut dreg fiber is preferably 1 to 4wt%, more preferably 1.5 to 3wt%, and still more preferably 2wt% based on 100 wt% of asphalt. The invention can improve the high-temperature and low-temperature performance of the composite asphalt by limiting the mixing amount of the betel nut slag fiber to be within the range.
The PPA modified asphalt is heated firstly, and then betel nut dreg fibers are added for mixing.
In the present invention, the heating temperature is preferably 130 to 160 ℃. The PPA modified asphalt is softened by heating, so that the subsequent mixing is convenient.
In the present invention, the temperature of the mixing is preferably 160 to 180 ℃; the mixing time is preferably 0.5 to 1.5 hours. The invention can fully and uniformly mix betel nut slag fiber and PPA modified asphalt by limiting the mixing temperature and time to the above range, which is beneficial to the high and low temperature performances of the composite modified asphalt.
In the present invention, the mixing is preferably performed in a shear apparatus; the rotating speed of the shearing instrument is preferably 3000-5000 r/min, more preferably 4000r/min. According to the invention, the rotating speed of the shearing instrument is set in the range, so that betel nut residue fibers and PPA modified asphalt can be fully and uniformly mixed.
According to the invention, the PPA modifier is added into the asphalt, and the addition amount of the PPA modifier is adjusted, so that the high-temperature performance of the asphalt is improved; the betel nut slag fiber is added, and the mixing amount of the betel nut slag fiber is controlled, so that the betel nut slag fiber and PPA modified asphalt have excellent compatibility, and meanwhile, the high-temperature and low-temperature performances of the composite modified asphalt can be remarkably improved.
The invention also provides the composite modified asphalt prepared by the preparation method.
The betel nut residue fiber and the PPA modifier are mixed into the matrix asphalt in a compounding way, so that the modified asphalt has good high-temperature and low-temperature performance.
The technical solutions of the present invention will be clearly and completely described in the following in connection with the embodiments of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The preparation method of the composite modified asphalt comprises the following steps:
(1) Washing and drying areca seed residue with distilled water, immersing in NaOH solution with mass concentration of 5%, stirring in a magnetic stirrer at 80 ℃ and 2100rpm/min for 0.5h, and repeatedly washing with distilled water until the pH value is 7; mixing the areca dregs after alkaline leaching with an acrylic acid aqueous solution with the mass concentration of 10% for acylation treatment to obtain acylated areca dregs, washing the acylated areca dregs with distilled water to a pH value of 7, drying in an oven at 60 ℃ until the mass is constant, and crushing the areca dregs to a fiber length of 0.001-0.5 cm by using a fiber crusher to obtain areca dregs fibers; the temperature of the acylation treatment is the reflux temperature of an acylation solution, and the time of the acylation treatment is 1h;
(2) Heating asphalt to 150 ℃, manually stirring for 5min, then adding a PPA modifier, and shearing for 6min in a shearing instrument at 160 ℃ and 3500r/min to obtain PPA modified asphalt; the mixing amount of the PPA modifier is 1.0 weight percent based on 100 weight percent of asphalt;
(3) Heating the PPA modified asphalt in the step (2) to 150 ℃, adding the betel nut residue fibers in the step (1), and shearing for 0.5h in a shearing instrument at 160 ℃ and 4000r/min to obtain composite modified asphalt; the blending amount of the betel nut dreg fiber is 2 weight percent based on the weight ratio of asphalt being 100 percent.
Example 2
The preparation method of the composite modified asphalt comprises the following steps:
(1) Washing and drying areca seed residue with distilled water, immersing in NaOH solution with mass concentration of 5%, stirring in a magnetic stirrer at 80 ℃ and 2100rpm/min for 0.5h, and repeatedly washing with distilled water until the pH value is 7; mixing the areca dregs after alkaline leaching with an acrylic acid aqueous solution with the mass concentration of 10% for acylation treatment to obtain acylated areca dregs, washing the acylated areca dregs with distilled water to a pH value of 7, drying in an oven at 60 ℃ until the mass is constant, and crushing the areca dregs to a fiber length of 0.001-0.5 cm by using a fiber crusher to obtain areca dregs fibers; the temperature of the acylation treatment is the reflux temperature of an acylation solution, and the time of the acylation treatment is 1h;
(2) Heating asphalt to 150 ℃, manually stirring for 5min, then adding a PPA modifier, and shearing for 6min in a shearing instrument at 160 ℃ and 3500r/min to obtain PPA modified asphalt; the mixing amount of the PPA modifier is 1.0 weight percent based on 100 weight percent of asphalt;
(3) Heating the PPA modified asphalt in the step (2) to 150 ℃, adding the betel nut residue fibers in the step (1), and shearing for 0.5h in a shearing instrument at 160 ℃ and 4000r/min to obtain composite modified asphalt; the blending amount of the betel nut dreg fiber is 1 weight percent based on the weight ratio of asphalt being 100 percent.
Example 3
The preparation method of the composite modified asphalt comprises the following steps:
(1) Washing and drying areca seed residue with distilled water, immersing in NaOH solution with mass concentration of 5%, stirring in a magnetic stirrer at 80 ℃ and 2100rpm/min for 0.5h, and repeatedly washing with distilled water until the pH value is 7; mixing the areca dregs after alkaline leaching with an acrylic acid aqueous solution with the mass concentration of 10% for acylation treatment to obtain acylated areca dregs, washing the acylated areca dregs with distilled water to a pH value of 7, drying in an oven at 60 ℃ until the mass is constant, and crushing the areca dregs to a fiber length of 0.001-0.5 cm by using a fiber crusher to obtain areca dregs fibers; the temperature of the acylation treatment is the reflux temperature of an acylation solution, and the time of the acylation treatment is 1h;
(2) Heating asphalt to 150 ℃, manually stirring for 5min, then adding a PPA modifier, and shearing for 6min in a shearing instrument at 160 ℃ and 3500r/min to obtain PPA modified asphalt; the mixing amount of the PPA modifier is 1.5wt% based on 100% of asphalt by weight;
(3) Heating the PPA modified asphalt in the step (2) to 150 ℃, adding the betel nut residue fibers in the step (1), and shearing for 0.5h in a shearing instrument at 160 ℃ and 4000r/min to obtain composite modified asphalt; the blending amount of the betel nut dreg fiber is 2 weight percent based on the weight ratio of asphalt being 100 percent.
Example 4
The preparation method of the composite modified asphalt comprises the following steps:
(1) Washing and drying areca seed residue with distilled water, immersing in NaOH solution with mass concentration of 5%, stirring in a magnetic stirrer at 80 ℃ and 2100rpm/min for 0.5h, and repeatedly washing with distilled water until the pH value is 7; mixing the areca dregs after alkaline leaching with an acrylic acid aqueous solution with the mass concentration of 10% for acylation treatment to obtain acylated areca dregs, washing the acylated areca dregs with distilled water to a pH value of 7, drying in an oven at 60 ℃ until the mass is constant, and crushing the areca dregs to a fiber length of 0.001-0.5 cm by using a fiber crusher to obtain areca dregs fibers; the temperature of the acylation treatment is the reflux temperature of an acylation solution, and the time of the acylation treatment is 1h;
(2) Heating asphalt to 150 ℃, manually stirring for 5min, then adding a PPA modifier, and shearing for 6min in a shearing instrument at 160 ℃ and 3500r/min to obtain PPA modified asphalt; the mixing amount of the PPA modifier is 1.0 weight percent based on 100 weight percent of asphalt;
(3) Heating the PPA modified asphalt in the step (2) to 150 ℃, adding the betel nut residue fibers in the step (1), and shearing for 0.5h in a shearing instrument at 160 ℃ and 4000r/min to obtain composite modified asphalt; the blending amount of the betel nut dreg fiber is 4 weight percent based on the weight ratio of asphalt being 100 percent.
Comparative example 1
The preparation method of the composite modified asphalt comprises the following steps:
(1) Cleaning betel nut dregs with distilled water, drying in an oven at 60 ℃ until the quality is constant, and then crushing betel nut dregs to a fiber length of 0.001-0.5 cm by using a fiber crusher to obtain betel nut dregs fiber;
(2) Heating asphalt to 150 ℃, manually stirring for 5min, then adding a PPA modifier, and shearing for 6min in a shearing instrument at 160 ℃ and 3500r/min to obtain PPA modified asphalt; the mixing amount of the PPA modifier is 1.0 weight percent based on 100 weight percent of asphalt;
(3) Heating the PPA modified asphalt in the step (2) to 150 ℃, adding the betel nut residue fibers in the step (1), and shearing for 0.5h in a shearing instrument at 160 ℃ and 4000r/min to obtain composite modified asphalt; the blending amount of the betel nut dreg fiber is 2 weight percent based on the weight ratio of asphalt being 100 percent.
Comparative example 2
The preparation method of the modified asphalt comprises the following steps:
(1) Washing and drying areca seed residue with distilled water, immersing in NaOH solution with mass concentration of 5%, stirring in a magnetic stirrer at 80 ℃ and 2100rpm/min for 0.5h, and repeatedly washing with distilled water until the pH value is 7; mixing the areca dregs after alkaline leaching with an acrylic acid aqueous solution with the mass concentration of 10% for acylation treatment to obtain acylated areca dregs, washing the acylated areca dregs with distilled water to a pH value of 7, drying in an oven at 60 ℃ until the mass is constant, and crushing the areca dregs to a fiber length of 0.001-0.5 cm by using a fiber crusher to obtain areca dregs fibers; the temperature of the acylation treatment is the reflux temperature of an acylation solution, and the time of the acylation treatment is 1h;
(2) Heating asphalt to 150 ℃, adding the betel nut residue fibers in the step (1), and shearing for 0.5h in a shearing instrument at 160 ℃ and 4000r/min to obtain modified asphalt; the blending amount of the betel nut dreg fiber is 2 weight percent based on the weight ratio of asphalt being 100 percent.
Comparative example 3
The preparation method of the composite modified asphalt comprises the following steps:
(1) Washing and drying areca seed residue with distilled water, immersing in NaOH solution with mass concentration of 5%, stirring in a magnetic stirrer at 80 ℃ and 2100rpm/min for 0.5h, and repeatedly washing with distilled water until the pH value is 7; mixing the areca dregs after alkaline leaching with an acrylic acid aqueous solution with the mass concentration of 10% for acylation treatment to obtain acylated areca dregs, washing the acylated areca dregs with distilled water to a pH value of 7, drying in an oven at 60 ℃ until the mass is constant, and crushing the areca dregs to a fiber length of 0.001-0.5 cm by using a fiber crusher to obtain areca dregs fibers; the temperature of the acylation treatment is the reflux temperature of an acylation solution, and the time of the acylation treatment is 1h;
(2) Heating asphalt to 150 ℃, manually stirring for 5min, then adding a PPA modifier, and shearing for 6min in a shearing instrument at 160 ℃ and 3500r/min to obtain PPA modified asphalt; the mixing amount of the PPA modifier is 1.0 weight percent based on 100 weight percent of asphalt;
(3) Heating the PPA modified asphalt in the step (2) to 150 ℃, adding the betel nut residue fibers in the step (1), and shearing for 0.5h in a shearing instrument at 160 ℃ and 4000r/min to obtain composite modified asphalt; the blending amount of the betel nut dreg fiber is 6 weight percent based on the weight ratio of asphalt being 100 percent.
The composite modified asphalt prepared in examples 1 to 4 and comparative examples 1 to 3 were subjected to penetration, softening point and ductility performance tests, the test methods were carried out according to the test procedure for road engineering asphalt and asphalt mixtures, and the test results are shown in the following table:
table 1 properties of the composite modified asphalt prepared in examples 1 to 4 and comparative examples 1 to 3
Numbering device Penetration (0.1 mm) Softening point (. Degree. C.) Ductility at 10 deg.C (mm)
Example 1 47.0 57.6 94.8
Example 2 56.0 57.3 56.2
Example 3 49.0 60.2 50.7
Example 4 46.3 57.6 62.0
Comparative example 1 47.4 56.8 73.3
Comparative example 2 50.6 54.8 52.3
Comparative example 3 38.0 56.3 36.4
Matrix asphalt 64.2 50.1 247.0
1% PPA modified asphalt 49.9 59.2 75.4
1.5% PPA modified asphalt 42.0 62.4 68.6
As can be seen from the properties of the composite modified asphalt prepared in examples 1 to 4 and comparative examples 1 to 3 in table 1, in comparative example 1, the betel nut dreg fibers which are not subjected to alkaline leaching and acylation treatment are directly doped into the PPA modified asphalt, and the viscosity of the modified asphalt is improved and the fluidity is reduced due to the strong water absorption capacity of the fibers, and the high-low temperature performance of the matrix asphalt is improved to a certain extent but is significantly lower than that of example 1; in comparative example 2, betel nut dreg fibers are used for singly modifying matrix asphalt, and as the fibers absorb oil in the asphalt, the plastic flow of the asphalt is reduced, so that the improvement of the ductility of the modified asphalt is not obvious; in comparative example 3, the content of betel nut dreg fiber exceeds 4%, the betel nut dreg fiber and PPA modified asphalt are difficult to mix, and the improvement of high-low temperature performance is greatly reduced compared with example 1.
From the above experimental data, it can be seen that: the penetration (0.1 mm) of the composite modified asphalt prepared by the embodiment of the invention is 47, the softening point is 57.6 ℃, the ductility at 10 ℃ is 94.8mm, and compared with PPA modified asphalt, the high-temperature performance and the low-temperature performance of the composite modified asphalt are obviously improved, and the composite modified asphalt has promotion effect on large-scale application of PPA modifier and recycling of waste.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.

Claims (6)

1. The preparation method of the composite modified asphalt comprises the following steps:
(1) Pretreating betel nut dregs to obtain betel nut dreg fibers;
(2) Modifying asphalt by using a polyphosphoric acid modifier to obtain polyphosphoric acid modified asphalt; the mixing amount of the polyphosphoric acid modifier is 0.8-1.5wt%;
(3) Mixing the betel nut dreg fibers obtained in the step (1) with the polyphosphoric acid modified asphalt obtained in the step (2) to obtain composite modified asphalt; the mixing amount of the waste betel nut dreg fibers is 1-4wt%;
the steps (1) and (2) are not in sequence;
the pretreatment in the step (1) comprises: sequentially performing alkaline leaching and acylation treatment on betel nut residues;
the alkaline leaching temperature is 60-100 ℃, the alkaline leaching time is 0.5-1 h, and the mass concentration of the alkaline solution used in the alkaline leaching is 2-10%;
the temperature of the acylation treatment is the reflux temperature of the acylation solution, the time of the acylation treatment is 0.5-1 h, and the mass concentration of the acylation solution used in the acylation treatment is 2-10%;
the acylating solution is an aqueous solution of one or more of acetic anhydride, benzoyl and acrylic acid.
2. The method according to claim 1, wherein the length of the betel nut dreg fiber in the step (1) is 0.001-1 cm.
3. The method according to claim 1, wherein the alkaline solution is NaOH solution, ca (OH) 2 Solution and Na 2 CO 3 One or more of the solutions.
4. The method according to claim 1, wherein the temperature of the modification in the step (2) is 150 to 160 ℃ and the time of the modification is 6 to 30min.
5. The method according to claim 1, wherein the temperature of the mixing in the step (3) is 160 to 180 ℃ and the mixing time is 0.5 to 1.5 hours.
6. A composite modified asphalt prepared by the preparation method of any one of claims 1 to 5.
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CN108314357A (en) * 2018-01-18 2018-07-24 长安大学 A kind of cocoanut fiber asphalt and preparation method thereof
CN109704649A (en) * 2019-01-21 2019-05-03 中南林业科技大学 A kind of modified bamboo fiber asphalt and preparation method thereof
CN114921108A (en) * 2022-07-05 2022-08-19 长沙理工大学 Modified asphalt and preparation method thereof

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CN109704649A (en) * 2019-01-21 2019-05-03 中南林业科技大学 A kind of modified bamboo fiber asphalt and preparation method thereof
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