Butun rock modified recycled asphalt concrete and preparation method thereof

Abstract

The invention discloses a Butun rock modified recycled asphalt concrete and a preparation method thereof, which relate to the technical field of asphalt concrete production, and comprise the following components by weight: 2 parts of base asphalt, 5 parts of Butun rock asphalt, 100 parts of crushed stone, 1 part of mineral powder, 40 parts of recycled material, 0.5 parts of talcum powder, 0.05 parts of stabilizer, 0.02 parts of dispersant, and 0.07 parts of surfactant; in this scheme, by grinding the Butun rock asphalt and then pulverizing it with other components, the dispersion in the subsequent stirring process can be guaranteed and the agglomeration phenomenon can be reduced; then, in the process of drying and mixing with the recycled material, the mixed component made of Butun rock asphalt, talcum powder, stabilizer, dispersant, and surfactant can also play the role of a regenerating agent, and can adjust the viscosity and rheological properties of the old asphalt; at the same time, the preparation process provided by the scheme is easy to implement, simple and efficient, can reduce the amount of asphalt used, save costs, and can also effectively reduce the phenomenon of white material.

Description

Technical Field

[0001] The invention relates to Buton rock modified regenerated asphalt concrete and a preparation method thereof, belonging to the technical field of asphalt concrete production. Background Art

[0003] Buton rock asphalt (BRA) originates from Buton Island in Sulawesi Province, Indonesia, in the South Pacific. It can be incorporated into asphalt as a modifier. In addition to containing asphalt, it also contains minerals. Unlike typical sand and gravel, these minerals enhance the adhesion between asphalt and coarse and fine aggregates, exhibiting strong activity. As a type of natural asphalt, BRA shares the same properties as natural asphalt, including strong adhesion, oxidation resistance, and aging resistance, as well as a high softening point. This can, to a certain extent, address the poor low-temperature performance of recycled asphalt concrete. Furthermore, BRA produces less pollution during the modification process than SBS-modified asphalt. Therefore, combining BRA-modified asphalt with RAP materials not only conserves stone material and reduces costs, but also increases the lifespan of the pavement, reduces maintenance frequency, and significantly reduces repair costs, resulting in substantial economic benefits.

[0004] In the traditional factory-mixed hot recycling technology, the old material is first heated and dried before entering the mixing tank to be mixed with the heated mineral material. The heated asphalt is then sprayed into the mixing tank, and finally mineral powder is added for mixing. However, Buton rock asphalt is generally added during the mixing process of the old material and the new material.

[0005] In summary, the existing technology still has the following problems: 1. Traditional recycled asphalt recycled materials often have problems with low temperature performance and poor anti-aging performance; 2. After Buton rock asphalt enters the mixing tank, the mixing time is too short, which easily leads to agglomeration. Therefore, new solutions are needed to solve the above problems. Summary of the Invention

[0006] In response to the above-mentioned technical problems, the present invention proposes a Butun rock modified recycled asphalt concrete and a preparation method thereof.

[0007] The technical solution of the present invention is achieved as follows: a Buton rock modified recycled asphalt concrete comprises the following components by weight:

[0008] 2 parts of matrix asphalt, 5 parts of Butun rock asphalt, 100 parts of crushed stone, 1 part of mineral powder, 40 parts of recycled material, 0.5 parts of talc, 0.05 parts of stabilizer, 0.02 parts of dispersant, and 0.07 parts of surfactant.

[0009] Preferably, the matrix asphalt is 70# asphalt.

[0010] Preferably, the gravel is basalt or limestone.

[0011] Preferably, the stabilizer is methyl vinyl silicone rubber.

[0012] Preferably, the dispersant is prepared by mixing microcrystalline wax and polybutyl acrylate in a mass ratio of 2:1.

[0013] Preferably, the surfactant is polyoxyethylene stearate.

[0014] The present invention also provides a method for preparing Butun rock modified regenerated asphalt concrete, comprising the following steps:

[0015] S1, grinding Butun rock asphalt, and crushing it with talc, stabilizer, dispersant, and surfactant to obtain a mixed component A;

[0016] S2, mixing and drying the recycled material and the mixed component A at a temperature of 110 to 120°C for 30 minutes;

[0017] S3, heating the crushed stone to 180 to 200°C, adding it to the product obtained in step S2, and stirring and dispersing it for 10 minutes;

[0018] S4, heating the matrix asphalt to 140 to 150° C., adding it to the product obtained in step S3, and stirring and dispersing it for 30 minutes;

[0019] S5, adding the mineral powder to the product obtained in step S4, stirring and dispersing the mixture, the stirring time is 5 minutes, and obtaining Butun rock modified recycled asphalt concrete.

[0020] Preferably, in step S1, the diameter of the ground Butun rock asphalt is 15 to 25 microns.

[0021] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0022] 1. The present invention grinds the Butun rock asphalt and then pulverizes it with other components to ensure dispersion during the subsequent stirring process and reduce the agglomeration phenomenon; then, during the drying and mixing process with the recycled material, the mixed component made of Butun rock asphalt, talcum powder, stabilizer, dispersant, and surfactant will also act as a regeneration agent, which can adjust the viscosity and rheological properties of the old asphalt.

[0023] 2. The preparation process of the present invention is easy to implement, simple and efficient, can reduce the amount of asphalt used, save costs, and can also effectively reduce the phenomenon of white material. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the embodiments.

[0025] A Buton rock modified recycled asphalt concrete comprising the following components by weight:

[0026] 2 parts of matrix asphalt, 5 parts of Butun rock asphalt, 100 parts of crushed stone, 1 part of mineral powder, 40 parts of recycled material, 0.5 parts of talc, 0.05 parts of stabilizer, 0.02 parts of dispersant, and 0.07 parts of surfactant.

[0027] Among them, the matrix asphalt is 70# asphalt, the gravel is a type of basalt or limestone, the stabilizer is methyl vinyl silicone rubber, the dispersant is microcrystalline wax and polybutyl acrylate in a mass ratio of 2:1, and the surfactant is polyoxyethylene stearate.

[0028] The preparation method of the Buton rock modified recycled asphalt concrete comprises the following steps:

[0029] S1, grinding the Butun rock asphalt, and crushing it with talc, a stabilizer, a dispersant, and a surfactant to obtain a mixed component A; specifically, the diameter of the Butun rock asphalt after grinding is 15 to 25 microns.

[0030] S2, mixing and drying the recycled material and the mixed component A at a temperature of 110 to 120°C for 30 minutes;

[0031] S3, heating the crushed stone to 180 to 200°C, adding it to the product obtained in step S2, and stirring and dispersing it for 10 minutes;

[0032] S4, heating the matrix asphalt to 140 to 150° C., adding it to the product obtained in step S3, and stirring and dispersing it for 30 minutes;

[0033] S5, adding the mineral powder to the product obtained in step S4, stirring and dispersing the mixture, the stirring time is 5 minutes, and obtaining Butun rock modified recycled asphalt concrete.

[0034] By grinding the Butun rock asphalt and then crushing it with other components, the dispersion in the subsequent mixing process can be guaranteed and the agglomeration phenomenon can be reduced; then, during the drying and mixing process with the recycled materials, the mixed components made of Butun rock asphalt, talcum powder, stabilizer, dispersant, and surfactant will also act as a regeneration agent to adjust the viscosity and rheological properties of the old asphalt.

[0035] The preparation process is easy to implement, simple and efficient, can reduce the amount of asphalt used, save costs, and can also effectively reduce the phenomenon of white material.

[0036] In summary, BRA recycled asphalt concrete has higher high-temperature shear deformation resistance and water damage resistance than ordinary asphalt concrete, and is particularly suitable for road construction and maintenance operations in hot and rainy areas in the south in summer.

[0037] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A Buton rock modified recycled asphalt concrete, characterized in that: Contains the following ingredients by weight: 2 parts of base asphalt, 5 parts of Butun rock asphalt, 100 parts of crushed stone, 1 part of mineral powder, 40 parts of recycled materials, 0.5 parts of talcum powder, 0.05 parts of stabilizer, 0.02 parts of dispersant, and 0.07 parts of surfactant.

2. The Buton rock modified recycled asphalt concrete according to claim 1, characterized in that: The matrix asphalt is 70# asphalt.

3. The Buton rock modified recycled asphalt concrete according to claim 1, characterized in that: The crushed stone is a kind of basalt or limestone.

4. The Buton rock modified recycled asphalt concrete according to claim 1, characterized in that: The stabilizer is methyl vinyl silicone rubber.

5. The Buton rock modified recycled asphalt concrete according to claim 1, characterized in that: The dispersant is prepared by mixing microcrystalline wax and polybutyl acrylate in a mass ratio of 2:

1.

6. The Buton rock modified recycled asphalt concrete according to claim 1, characterized in that: The surfactant is polyoxyethylene stearate.

7. A method for preparing Buton rock modified recycled asphalt concrete, characterized in that: The following steps are involved: S1, grinding the Butun rock asphalt, and crushing it with talcum powder, stabilizer, dispersant, and surfactant to obtain a mixed component A; S2, mixing and drying the recycled material and the mixed component A at a temperature of 110 to 120° C. for 30 minutes; S3, heating the crushed stone to 180 to 200° C., adding the crushed stone to the product obtained in step S2, and stirring and dispersing the crushed stone for 10 minutes; S4, heating the base asphalt to 140 to 150° C., adding it to the product obtained in step S3, stirring and dispersing, and the stirring time is 30 minutes; S5, adding the mineral powder to the product obtained in step S4, stirring and dispersing, the stirring time is 5 minutes, and obtaining butun rock modified recycled asphalt concrete.

8. The method for preparing a Butun rock modified recycled asphalt concrete according to claim 7, characterized in that: In step S1, the diameter of the ground Butun rock asphalt is 15 to 25 microns.