Emulsified modified asphalt capable of being used as micro-surfacing of RAP fine material and preparation method of emulsified modified asphalt

Abstract

The invention discloses emulsified modified asphalt capable of being used as micro-surfacing of RAP fine materials and a preparation method of the emulsified modified asphalt. The emulsified modified asphalt comprises the following raw material components in parts by mass: 65-75 parts of matrix asphalt, 2-4 parts of a modifier, 0.1-0.2 part of a stabilizer, 5-10 parts of a diluent, 2-4 parts of a regenerant, 1-3 parts of a penetrant, 1-2 parts of a wetting agent, 1-2 parts of an emulsifier and a proper amount of hydrochloric acid. The emulsified modified asphalt prepared from the raw materials is stable in storage, can effectively wet aged asphalt on the surface of RAP, efficiently permeates into the deep layer of the aged asphalt, efficiently activates the aged asphalt on the surface of RAP at normal temperature, enhances the overall bonding performance of micro-surfacing and prevents diseases such as loosening and particle falling, and the emulsified modified asphalt adopts waste engine oil as a regenerant.

Description

Technical Field

[0001] The invention relates to the technical field of road engineering materials, and in particular to an emulsified modified asphalt that can be used for micro-surfacing of RAP fine materials and a preparation method thereof. Background Art

[0002] The accelerated urbanization process and rapid economic development have made solid waste disposal an urgent issue. A large amount of waste has caused serious pollution to the soil, water and air, threatening people's health and living environment.

[0003] At present, in order to reduce the variability of RAP (recycled asphalt pavement material) in solid waste, improve the performance of recycled asphalt mixture, and enhance its application in asphalt pavement engineering, researchers use fine separation technology to process RAP materials. It can effectively reduce the asphalt content of RAP coarse material and produce a large amount of oil-rich RAP fine material. From the perspective of recycled asphalt mixture quality control and construction technology, oil-poor RAP coarse material can be widely used in asphalt pavement engineering; however, due to production process and grading limitations, oil-rich RAP fine material is difficult to fully apply to asphalt pavement engineering. The accumulation of this material occupies a large amount of land resources and poses a major ecological and environmental safety hazard.

[0004] The present invention applies RAP fine material to micro-surfacing technology. The current problem is how to quickly and efficiently activate the aged asphalt on the RAP surface under normal temperature construction conditions. Therefore, developing an emulsified modified asphalt that can be used for micro-surfacing of RAP fine material is of great significance to improving the performance of regenerated micro-surfacing. Summary of the invention

[0005] In view of this, the present invention provides an emulsified modified asphalt that can be used for micro-surfacing of RAP fines and a preparation method thereof. In view of the problems existing in the prior art such as insufficient regeneration under normal temperature conditions, waste of resources caused by the use of aged asphalt in RAP as "black stone", and loose particles caused by insufficient bonding performance of the binder after demulsification, the present invention proposes an emulsified modified asphalt that can be used for micro-surfacing of RAP fines and a preparation method thereof. The emulsified asphalt can be efficiently spread on the surface of the RAP material and quickly infiltrate and penetrate into the deep asphalt layer on the surface of the RAP, activate the aged asphalt on the surface of the RAP, have sufficient construction operation time, rapidly increase strength after demulsification, have strong viscosity, and can form a stable system with oil-rich RAP fines.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] An emulsified modified asphalt that can be used for micro-surfacing of RAP fine materials is characterized in that the emulsified modified asphalt comprises the following raw material components by mass: 65-75 parts of base asphalt, 2-4 parts of modifier, 0.1-0.2 parts of stabilizer, 5-10 parts of diluent, 2-4 parts of regeneration agent, 1-3 parts of penetrant, 1-2 parts of wetting agent, 1-2 parts of emulsifier and hydrochloric acid.

[0008] Preferably, the base asphalt is one or a combination of heavy traffic No. 70 and No. 90 road asphalt.

[0009] Preferably, the modifier is a linear SBS modifier.

[0010] Preferably, the stabilizer is one of a polymer emulsified asphalt stabilizer, a nanomaterial emulsified asphalt stabilizer, a surfactant emulsified asphalt stabilizer and a silicate emulsified asphalt stabilizer; wherein the polymer emulsified asphalt stabilizer includes an acrylate copolymer and a styrene-butadiene copolymer, and the nanomaterial emulsified asphalt stabilizer includes iron oxide nanoparticles and silicate nanoparticles.

[0011] Preferably, the diluent is one or more combinations of kerosene, naphtha and diesel.

[0012] Preferably, the regeneration agent is a waste oil regeneration agent, and the preparation method of the waste oil regeneration agent is: obtaining a regenerated base oil through pretreatment, dehydration treatment, and deacidification treatment, decolorizing and deodorizing the regenerated base oil, and adding an antioxidant, an anti-wear agent, and a viscosity index improver to obtain it.

[0013] Preferably, the penetrant is one or more combinations of phosphate penetrants, silicate penetrants, and organic amine penetrants.

[0014] Preferably, the wetting agent is a silanol nonionic wetting agent.

[0015] Preferably, the emulsifier is a slow-cracking, fast-setting cationic asphalt emulsifier, specifically, one of the quaternary ammonium salt emulsifiers cetyltrimethylammonium bromide and cetyltrimethylammonium chloride.

[0016] A method for preparing emulsified modified asphalt that can be used for micro-surfacing of RAP fines, characterized in that it comprises the following steps:

[0017] (1) heating the base asphalt to 155° C., turning on the shearing machine, adjusting the speed to 1500-2000 r / min, and slowly adding the SBS modifier;

[0018] (2) Raise the temperature to 175°C, adjust the speed to 4000 r / min, and shear for 50-60 minutes. During the shearing process, control the temperature of the asphalt to be maintained at 175°C, and keep the temperature change within 10°C;

[0019] (3) Keeping the asphalt heating temperature at 175°C, adding a special stabilizer, and continuing stirring for 90-100 minutes to obtain SBS modified asphalt;

[0020] (4) Replace the mixer, adjust the speed to 450 r / min, add diluent, regeneration agent, penetrant and wetting agent to the prepared SBS modified asphalt, and stir for 15 min;

[0021] (5) heating the modified asphalt prepared above to 175-180° C. and keeping it warm for later use;

[0022] (6) Take a clean beaker and add distilled water heated to 70°C, stir the prepared emulsifier evenly, slowly pour it into the beaker, use a glass rod to stir the water and emulsifier evenly, add dilute hydrochloric acid to adjust the pH value, use acid pH test paper and standard colorimetric card to compare until the pH value is adjusted to 2-3, add 0.1 parts of stabilizer, stir, and keep the soap solution temperature at 70°C during the process, keep warm for use;

[0023] (7) Add soap solution into the colloid mill, start the colloid mill circulation system, slowly add the insulated SBS modified asphalt, mix it with the soap solution and stir and emulsify it in the colloid mill. The working pressure of the colloid mill is 0.18-0.25Mpa, and the speed is adjusted according to different equipment, generally 4500-6000r / min, to obtain emulsified modified asphalt, and test the indicators.

[0024] Compared with the prior art, the present invention has achieved the following technical effects:

[0025] (1) The emulsified asphalt prepared by the present invention can be efficiently spread on the surface of RAP material, and quickly infiltrate and penetrate into the deep asphalt layer on the surface of RAP, activate the aged asphalt on the surface of RAP, have sufficient construction operation time, and the strength increases rapidly after demulsification. It has strong viscosity and can form a stable system with RAP fine material;

[0026] (2) The present invention processes waste engine oil through regeneration technology, thereby reducing environmental pollution and resource consumption; at the same time, it can also reduce road construction costs, improve the performance of asphalt, and extend the service life of the road surface; this approach is not only environmentally friendly and sustainable, but also economically beneficial, and is one of the important measures to promote sustainable development. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The present invention is a flow chart of an emulsified modified asphalt that can be used for micro-surfacing of RAP fine materials and a preparation method thereof. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Embodiment 1:

[0030] An emulsified modified asphalt that can be used for micro-surfacing of RAP fine material and a preparation method thereof, comprising the following steps:

[0031] (1) Heat 65 parts of base asphalt to 155°C, turn on the shearing machine, adjust the speed to 1500-2000 r / min, and slowly add 2 parts of SBS modifier;

[0032] (2) Raise the temperature to 175°C, adjust the speed to 4000 r / min, and shear for 50-60 minutes. During the shearing process, control the temperature of the asphalt to be maintained at 175°C, and keep the temperature change within 10°C;

[0033] (3) Keeping the asphalt heating temperature at 175°C, adding a special stabilizer, and continuing stirring for 90-100 minutes to obtain SBS modified asphalt;

[0034] (4) Replace the mixer and adjust the speed to 450 r / min. Add 5 parts of diluent, 2 parts of regeneration agent, 1 part of penetrant, and 1 part of wetting agent to the prepared SBS modified asphalt and stir for 15 minutes.

[0035] (5) heating the modified asphalt prepared above to 175-180° C. and keeping it warm for later use;

[0036] (6) Take a clean beaker and add distilled water heated to 70°C, stir the prepared emulsifier evenly, slowly pour it into the beaker, use a glass rod to stir the water and 1 part of the emulsifier evenly, add dilute hydrochloric acid to adjust the pH value, and use acid pH test paper to compare with the standard colorimetric card until the pH value is adjusted to 2-3; add 0.1 part of stabilizer and stir. During the process, the soap solution temperature will be kept at 70°C and keep warm for use;

[0037] (7) Add soap solution into the colloid mill, start the colloid mill circulation system, slowly add the insulated SBS modified asphalt, mix it with the soap solution and stir and emulsify it in the colloid mill. The working pressure of the colloid mill is 0.18-0.25Mpa, and the speed is adjusted according to different equipment, generally 4500-6000r / min, to obtain emulsified modified asphalt, and test the indicators.

[0038] Embodiment 2:

[0039] An emulsified modified asphalt that can be used for micro-surfacing of RAP fine material and a preparation method thereof, comprising the following steps:

[0040] (1) Heat 70 parts of base asphalt to 155°C, turn on the shearing machine, adjust the speed to 1500-2000 r / min, and slowly add 3 parts of SBS modifier;

[0041] (2) Raise the temperature to 175°C, adjust the speed to 4000 r / min, and shear for 50-60 minutes. During the shearing process, control the temperature of the asphalt to be maintained at 175°C, and keep the temperature change within 10°C;

[0042] (3) Keeping the asphalt heating temperature at 175°C, adding a special stabilizer, and continuing stirring for 90-100 minutes to obtain SBS modified asphalt;

[0043] (4) Replace the mixer, adjust the speed to 450 r / min, add 7 parts of diluent, 3 parts of regeneration agent, 2 parts of penetrant, and 1.5 parts of wetting agent to the prepared SBS modified asphalt, and stir for 15 minutes;

[0044] (5) heating the modified asphalt prepared above to 175-180° C. and keeping it warm for later use;

[0045] (6) Take a clean beaker and add distilled water heated to 70°C, stir the prepared emulsifier evenly, slowly pour it into the beaker, use a glass rod to stir the water and 1.5 parts of the emulsifier evenly, add dilute hydrochloric acid to adjust the pH value, use acid pH test paper and standard colorimetric card to compare until the pH value is adjusted to 2-3, add 0.15 parts of stabilizer, stir, and keep the soap solution temperature at 70°C during the process, keep warm for use;

[0046] (7) Add soap solution into the colloid mill, start the colloid mill circulation system, slowly add the insulated SBS modified asphalt, mix it with the soap solution and stir and emulsify it in the colloid mill. The working pressure of the colloid mill is 0.18-0.25Mpa, and the speed is adjusted according to different equipment, generally 4500-6000r / min, to obtain emulsified modified asphalt, and test the indicators.

[0047] Embodiment 3:

[0048] An emulsified modified asphalt that can be used for micro-surfacing of RAP fine material and a preparation method thereof, comprising the following steps:

[0049] (1) Heat 75 parts of base asphalt to 155°C, turn on the shearing machine, adjust the speed to 1500-2000 r / min, and slowly add SBS modifier;

[0050] (2) Raise the temperature to 175°C, adjust the speed to 4000 r / min, and shear for 50-60 minutes. During the shearing process, control the temperature of the asphalt to be maintained at 175°C, and keep the temperature change within 10°C;

[0051] (3) Keeping the asphalt heating temperature at 175°C, adding a special stabilizer, and continuing stirring for 90-100 minutes to obtain SBS modified asphalt;

[0052] (4) Replace the mixer, adjust the speed to 450 r / min, add 10 parts of diluent, 4 parts of regeneration agent, 3 parts of penetrant, and 2 parts of wetting agent to the prepared SBS modified asphalt, and stir for 15 min;

[0053] (5) heating the modified asphalt prepared above to 175-180° C. and keeping it warm for later use;

[0054] (6) Take a clean beaker and add distilled water heated to 70°C, stir the prepared emulsifier evenly, slowly pour it into the beaker, use a glass rod to stir the water and 2 parts of the emulsifier evenly, add dilute hydrochloric acid to adjust the pH value, use acid pH test paper and standard colorimetric card to compare until the pH value is adjusted to 2-3, add 0.2 parts of stabilizer, stir, and keep the soap solution temperature at 70°C during the process, keep warm for use;

[0055] (7) Add soap solution into the colloid mill, start the colloid mill circulation system, slowly add the insulated SBS modified asphalt, mix it with the soap solution and stir and emulsify it in the colloid mill. The working pressure of the colloid mill is 0.18-0.25Mpa, and the speed is adjusted according to different equipment, generally 4500-6000r / min, to obtain emulsified modified asphalt, and test the indicators.

[0056] Embodiment 4:

[0057] An emulsified modified asphalt that can be used for micro-surfacing of RAP fine material and a preparation method thereof, comprising the following steps:

[0058] (1) Heat 60 parts of base asphalt to 155°C, turn on the shearing machine, adjust the speed to 1500-2000 r / min, and slowly add 1 part of SBS modifier;

[0059] (2) Raise the temperature to 175°C, adjust the speed to 4000 r / min, and shear for 50-60 minutes. During the shearing process, control the temperature of the asphalt to be maintained at 175°C, and keep the temperature change within 10°C;

[0060] (3) Keeping the asphalt heating temperature at 175°C, adding a special stabilizer, and continuing stirring for 90-100 minutes to obtain SBS modified asphalt;

[0061] (4) Replace the mixer and adjust the speed to 450 r / min. Add 4 parts of diluent, 1 part of regeneration agent, 0.5 parts of penetrant, and 0.5 parts of wetting agent to the prepared SBS modified asphalt and stir for 15 minutes.

[0062] (5) heating the modified asphalt prepared above to 175-180° C. and keeping it warm for later use;

[0063] (6) Take a clean beaker and add distilled water heated to 70°C, stir the prepared emulsifier evenly, slowly pour it into the beaker, use a glass rod to stir the water and 0.5 parts of the emulsifier evenly, add dilute hydrochloric acid to adjust the pH value, and use acid pH test paper to compare with the standard colorimetric card until the pH value is adjusted to 2-3; add 0.05 parts of stabilizer and stir. During the process, the soap solution temperature will be kept at 70°C and kept warm for use;

[0064] (7) Add soap solution into the colloid mill, start the colloid mill circulation system, slowly add the insulated SBS modified asphalt, mix it with the soap solution and stir and emulsify it in the colloid mill. The working pressure of the colloid mill is 0.18-0.25Mpa, and the speed is adjusted according to different equipment, generally 4500-6000r / min, to obtain emulsified modified asphalt, and test the indicators.

[0065] Embodiment 5:

[0066] An emulsified modified asphalt that can be used for micro-surfacing of RAP fine material and a preparation method thereof, comprising the following steps:

[0067] (1) Heat 80 parts of base asphalt to 155°C, turn on the shearing machine, adjust the speed to 1500-2000 r / min, and slowly add SBS modifier;

[0068] (2) Raise the temperature to 175°C, adjust the speed to 4000 r / min, and shear for 50-60 minutes. During the shearing process, control the temperature of the asphalt to be maintained at 175°C, and keep the temperature change within 10°C;

[0069] (3) Keeping the asphalt heating temperature at 175°C, adding a special stabilizer, and continuing stirring for 90-100 minutes to obtain SBS modified asphalt;

[0070] (4) Replace the mixer, adjust the speed to 450 r / min, add 12 parts of diluent, 5 parts of regeneration agent, 4 parts of penetrant, and 3 parts of wetting agent to the prepared SBS modified asphalt, and stir for 15 min;

[0071] (5) heating the modified asphalt prepared above to 175-180° C. and keeping it warm for later use;

[0072] (6) Take a clean beaker and add distilled water heated to 70°C, stir the prepared emulsifier evenly, slowly pour it into the beaker, use a glass rod to stir the water and 3 parts of emulsifier evenly, add dilute hydrochloric acid to adjust the pH value, use acid pH test paper and standard colorimetric card to compare until the pH value is adjusted to 2-3, add 0.3 parts of stabilizer, stir, and keep the soap solution temperature at 70°C during the process, keep warm for use;

[0073] (7) Add soap solution into the colloid mill, start the colloid mill circulation system, slowly add the insulated SBS modified asphalt, mix it with the soap solution and stir and emulsify it in the colloid mill. The working pressure of the colloid mill is 0.18-0.25Mpa, and the speed is adjusted according to different equipment, generally 4500-6000r / min, to obtain emulsified modified asphalt, and test the indicators.

[0074] Implementations 1 to 5 used a softening point double-layer sample to detect the penetration process and the results are as follows:

[0075] The softening point mold is 3.6mm deep. First, cast a 1.8mm aged asphalt sample, wait for 30 minutes to cool at room temperature, then cast an emulsified asphalt evaporation residue of 1.8mm, and cure at room temperature for 30 minutes to conduct a softening point test. The results of implementation 1 to 5 are as follows:

[0076]

[0077]

[0078] According to the experimental results, the emulsified asphalt prepared by the raw materials and methods of the present invention has the best storage stability and the highest permeability. It can be efficiently spread on the surface of RAP material and quickly penetrate into the deep layer of asphalt on the surface of RAP, activate the aged asphalt on the surface of RAP, and the construction operation time is sufficient. The strength increases rapidly after demulsification, the viscosity is strong, and a stable system can be formed with RAP fine material. In addition, the present invention processes waste oil through regeneration technology to reduce environmental pollution and resource consumption. At the same time, it can also reduce road construction costs, improve the performance of asphalt, and extend the service life of the road surface; this approach is not only environmentally friendly and sustainable, but also has economic benefits, and is one of the important measures to promote sustainable development.

[0079] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An emulsified modified asphalt that can be used for micro-surfacing of RAP fines, characterized in that: The emulsified modified asphalt includes the following raw material components by mass: 65-75 parts of base asphalt, 2-4 parts of modifier, 0.1-0.2 parts of stabilizer, 5-10 parts of diluent, 2-4 parts of regeneration agent, 1-3 parts of penetrant, 1-2 parts of wetting agent, 1-2 parts of emulsifier and hydrochloric acid.

2. The emulsified modified asphalt that can be used for micro-surfacing of RAP fines according to claim 1, characterized in that: The matrix asphalt is one or a combination of heavy traffic No. 70 and No. 90 road asphalt.

3. The emulsified modified asphalt that can be used for micro-surfacing of RAP fines according to claim 1, characterized in that: The modifier is a linear SBS modifier.

4. The emulsified modified asphalt that can be used for micro-surfacing of RAP fines according to claim 1, characterized in that: The stabilizer is one of a polymer emulsified asphalt stabilizer, a nanomaterial emulsified asphalt stabilizer, a surfactant emulsified asphalt stabilizer and a silicate emulsified asphalt stabilizer; wherein the polymer emulsified asphalt stabilizer includes an acrylate copolymer and a styrene-butadiene copolymer, and the nanomaterial emulsified asphalt stabilizer includes iron oxide nanoparticles and silicate nanoparticles.

5. The emulsified modified asphalt that can be used for micro-surfacing of RAP fines according to claim 1, characterized in that: The diluent is one or more combinations of kerosene, naphtha and diesel.

6. The emulsified modified asphalt that can be used for micro-surfacing of RAP fines according to claim 1, characterized in that: The regeneration agent is a waste oil regeneration agent, and the preparation method of the waste oil regeneration agent is: obtaining a regenerated base oil through pretreatment, dehydration treatment, and deacidification treatment, decolorizing and deodorizing the regenerated base oil, and adding an antioxidant, an anti-wear agent, and a viscosity index improver to obtain the regenerated base oil.

7. The emulsified modified asphalt that can be used for micro-surfacing of RAP fines according to claim 1, characterized in that: The penetrant is one or more combinations of phosphate penetrants, silicate penetrants, and organic amine penetrants.

8. The emulsified modified asphalt that can be used for micro-surfacing of RAP fines according to claim 1, characterized in that: The wetting agent is a silanol nonionic wetting agent.

9. The emulsified modified asphalt that can be used for micro-surfacing of RAP fines according to claim 1, characterized in that: The emulsifier is a slow-cracking and fast-setting cationic asphalt emulsifier, specifically, one of the quaternary ammonium salt emulsifiers cetyltrimethylammonium bromide and cetyltrimethylammonium chloride.

10. A method for preparing emulsified modified asphalt that can be used for micro-surfacing of RAP fines, characterized in that: The steps include: (1) heating the base asphalt to 155° C., turning on the shearing machine, adjusting the speed to 1500-2000 r / min, and slowly adding the SBS modifier; (2) Raise the temperature to 175°C, adjust the speed to 4000 r / min, and shear for 50-60 minutes. During the shearing process, control the temperature of the asphalt to be maintained at 175°C, and keep the temperature change within 10°C; (3) Keeping the asphalt heating temperature at 175°C, adding a special stabilizer, and continuing stirring for 90-100 minutes to obtain SBS modified asphalt; (4) Replace the mixer, adjust the speed to 450 r / min, add diluent, regeneration agent, penetrant and wetting agent to the prepared SBS modified asphalt, and stir for 15 min; (5) heating the modified asphalt prepared above to 175-180° C. and keeping it warm for later use; (6) Take a clean beaker and add distilled water heated to 70°C, stir the prepared emulsifier evenly, slowly pour it into the beaker, use a glass rod to stir the water and emulsifier evenly, add dilute hydrochloric acid to adjust the pH value, use acid pH test paper and standard colorimetric card to compare until the pH value is adjusted to 2-3, add 0.1 parts of stabilizer, stir, and keep the soap solution temperature at 70°C during the process, keep warm for use; (7) Add soap solution into the colloid mill, start the colloid mill circulation system, slowly add the insulated SBS modified asphalt, mix it with the soap solution and stir and emulsify it in the colloid mill. The working pressure of the colloid mill is 0.18-0.25Mpa, and the speed is adjusted according to different equipment, generally 4500-6000r / min, to obtain emulsified modified asphalt, and test the indicators.

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