CN111592285A - Water damage resistant foam asphalt mixture and preparation method thereof - Google Patents
Water damage resistant foam asphalt mixture and preparation method thereof Download PDFInfo
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- CN111592285A CN111592285A CN202010378578.6A CN202010378578A CN111592285A CN 111592285 A CN111592285 A CN 111592285A CN 202010378578 A CN202010378578 A CN 202010378578A CN 111592285 A CN111592285 A CN 111592285A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses a water damage resistant foam asphalt mixture and a preparation method thereof, belongs to the technical field of asphalt mixtures, and aims to solve the problem that the existing foam asphalt cold recycling mixture is damaged by water generated by asphalt foaming water and mixture mixing water. The water damage resistant foamed asphalt mixture is prepared by mixing aggregate, water and foamed asphalt, wherein the aggregate comprises 75-90 parts by mass of asphalt mixture reclaimed materials, 4-20 parts by mass of stone chips, 3-5 parts by mass of mineral powder, 1-2 parts by mass of cement, 0.3-1.5 parts by mass of zinc oxide powder and 1-5 parts by mass of coupling agent solution; wherein the foamed asphalt contains amine anti-stripping agent. According to the water damage resistant foamed asphalt mixture, the surface of an asphalt mixture reclaimed material is modified by doping zinc oxide powder and a coupling agent, and asphalt is modified by doping an anti-stripping agent, so that the water damage resistance and the low temperature performance of the foamed asphalt cold-recycling mixture are improved.
Description
Technical Field
The invention belongs to the technical field of asphalt mixtures, and particularly relates to a foamed asphalt mixture and a preparation method thereof.
Background
With the development of economy in China, expressways in China develop rapidly, and the highway mileage in China reaches 484.65 kilometers by 2018, wherein the highway mileage is 14.26 kilometers. Wherein more than 90% of the highways are asphalt concrete pavements. However, because the service life of the highway in China is generally low, the highway built in advance reaches the design age limit, large-scale maintenance and reconstruction and expansion requirements are met, asphalt consumption is increased year by year, and the problem of recycling waste materials of old roads is to be solved urgently. In this context, recycled concrete technology has been vigorously developed. The foamed asphalt cold regeneration technology realizes complete normal-temperature mixing operation in the mixing process, reduces energy consumption and engineering cost, and is green and environment-friendly, so that the foamed asphalt cold regeneration technology has a good development prospect.
Currently, a key problem faced by foamed asphalt cold-recycled mixes is the problem of water damage. Both the water used for asphalt foaming and the water used for mix blending reduce the bond strength at the asphalt/aggregate interface. In addition, the evaporation of water after the foamed asphalt mixture is formed takes a long time, and during the time, the foamed asphalt cold-recycling mixture is easy to damage, and the actual road performance of the foamed asphalt cold-recycling mixture is influenced. Therefore, an additive or a new mixing method is sought, the bonding strength of the foamed asphalt mixture in the water environment is enhanced, the adverse effect of moisture on the foamed asphalt mixture is eliminated, and the engineering application of the foamed asphalt cold-recycling mixture can be promoted.
Disclosure of Invention
The invention aims to solve the problem of water damage of the existing foamed asphalt cold recycling mixture caused by asphalt foaming water and mixture mixing water, and provides a water damage resistant foamed asphalt mixture and a preparation method thereof.
The water damage resistant foamed asphalt mixture is prepared by mixing aggregate, water and foamed asphalt, wherein the aggregate comprises 75-90 parts by mass of asphalt mixture reclaimed materials (RAP), 4-20 parts by mass of stone chips, 3-5 parts by mass of mineral powder, 1-2 parts by mass of cement, 0.3-1.5 parts by mass of zinc oxide powder and 1-5 parts by mass of coupling agent solution; wherein the foamed asphalt contains amine anti-stripping agent.
The preparation method of the water damage resistant foamed asphalt mixture is realized according to the following steps:
firstly, heating and softening matrix asphalt to obtain preheated matrix asphalt, diluting an amine anti-stripping agent by using absolute ethyl alcohol, adding the diluted amine anti-stripping agent into the preheated matrix asphalt, and uniformly stirring at 150-170 ℃ to obtain the heated matrix asphalt;
secondly, mixing the heated matrix asphalt with foaming water by adopting a foamed asphalt generator for foaming to obtain foamed asphalt;
mixing and stirring 3-10 parts of silane coupling agent, 20-50 parts of anhydrous ethanol and 50-75 parts of water according to the mass parts to obtain a silane coupling agent solution, uniformly spraying the silane coupling agent solution on the surface of a reclaimed asphalt mixture (RAP), and drying to obtain the RAP treated by the silane coupling agent;
weighing 75-90 parts by mass of RAP treated by the silane coupling agent, 4-20 parts by mass of stone chips, 3-5 parts by mass of mineral powder, 0.3-1.5 parts by mass of zinc oxide powder and 1-2 parts by mass of cement as aggregate raw materials;
fifthly, putting the aggregate raw materials in the fourth step into a mixing pot, adding water, mixing, spraying foamed asphalt, and mixing to obtain the water damage resistant foamed asphalt mixture.
The existence of water can inhibit the bonding among cement, asphalt and RAP, so that the mixture is more easily subjected to shear failure, and the performance of the foamed asphalt cold-recycling mixture is unfavorable. In addition, the low-temperature performance of the mixture is reduced by moisture, and the foamed asphalt inevitably undergoes freeze-thaw cycles in winter in northern areas, so that the low-temperature crack resistance of the foamed asphalt mixture is particularly important. The addition of the coupling agent, the anti-stripping agent and the zinc oxide greatly improves the bonding strength between the RAP and the asphalt, improves the bonding strength between the RAP and the cement less, and can improve the low-temperature performance and the dry-wet splitting strength of the mixture.
According to the water damage resistant foamed asphalt mixture, the surface of a reclaimed asphalt mixture (RAP) is modified by adding zinc oxide powder and a coupling agent, and asphalt is modified by adding an anti-stripping agent, so that the water damage resistance of a foamed asphalt cold-recycling mixture is improved. The zinc oxide powder replaces part of mineral powder, so that the hydrophobic capacity of the asphalt mucilage can be improved, and the water removing capacity of the whole foamed asphalt mixture is further enhanced; the coupling agent has a chemical reaction with stone materials, and organic functional groups on the coupling agent have good compatibility with the asphalt, so that the bonding strength between organic and inorganic materials is improved, and the water stability of the foamed asphalt mixture is enhanced; the anti-stripping agent contains basic groups, is soluble in the asphalt, and has a chemical adsorption effect of ionic bonds between polar cationic ends and the surface of acidic stone, so that the bonding strength between the new asphalt and RAP can be enhanced by adding the anti-stripping agent into the asphalt.
Detailed Description
The first embodiment is as follows: the water damage resistant foamed asphalt mixture is prepared by mixing aggregate, water and foamed asphalt, wherein the aggregate comprises 75-90 parts by mass of Reclaimed Asphalt (RAP), 4-20 parts by mass of stone chips, 3-5 parts by mass of mineral powder, 1-2 parts by mass of cement, 0.3-1.5 parts by mass of zinc oxide powder and 1-5 parts by mass of coupling agent solution; wherein the foamed asphalt contains amine anti-stripping agent.
The second embodiment is as follows: the first difference between the present embodiment and the present embodiment is that the coupling agent is a silane coupling agent.
The third concrete implementation mode: the first or second embodiment is different from the first or second embodiment in that the coupling agent solution is formed by mixing a coupling agent, absolute ethyl alcohol and water.
The fourth concrete implementation mode: the third difference between the present embodiment and the third embodiment is that the coupling agent solution is formed by mixing 3-10 parts by mass of a coupling agent, 20-50 parts by mass of anhydrous ethanol, and 50-75 parts by mass of water.
The fifth concrete implementation mode: the difference between the first embodiment and the fourth embodiment is that the raw materials of the foamed asphalt comprise 90-98 parts of matrix asphalt, 1-10 parts of foaming water, 0.2-2 parts of amine anti-stripping agent and 10-50 parts of absolute ethyl alcohol by mass.
The sixth specific implementation mode: the difference between this embodiment and one of the first to fifth embodiments is that the amine anti-stripping agent is epoxidized rosin tetra-substituted diethylenetriamine, epoxidized octadecanoic acid tetra-substituted diethylenetriamine or epoxidized rosin octadecanoic acid di-substituted diethylenetriamine.
The seventh embodiment: the preparation method of the water damage resistant foamed asphalt mixture is implemented according to the following steps:
firstly, heating and softening matrix asphalt to obtain preheated matrix asphalt, diluting an amine anti-stripping agent by using absolute ethyl alcohol, adding the diluted amine anti-stripping agent into the preheated matrix asphalt, and uniformly stirring at 150-170 ℃ to obtain the heated matrix asphalt;
secondly, connecting the centralized generator and the distributed generator in parallel for use, and mixing and foaming the heated matrix asphalt and foaming water for the second time to obtain foamed asphalt;
mixing and stirring 3-10 parts of silane coupling agent, 20-50 parts of anhydrous ethanol and 50-75 parts of water according to the mass parts to obtain a silane coupling agent solution, uniformly spraying the silane coupling agent solution on the surface of a reclaimed asphalt mixture (RAP), and drying to obtain the RAP treated by the silane coupling agent;
weighing 75-90 parts by mass of RAP treated by the silane coupling agent, 4-20 parts by mass of stone chips, 3-5 parts by mass of mineral powder, 0.3-1.5 parts by mass of zinc oxide powder and 1-2 parts by mass of cement as aggregate raw materials;
fifthly, putting the aggregate raw materials in the fourth step into a mixing pot, adding water, mixing, spraying foamed asphalt, and mixing to obtain the water damage resistant foamed asphalt mixture.
The specific implementation mode is eight: the seventh embodiment is different from the seventh embodiment in that the base asphalt in the first step is heated at 120-140 ℃ for 2-3 hours to soften.
The specific implementation method nine: the seventh or eighth embodiment is different from the seventh or eighth embodiment in that in the first step, 90-98 parts by mass of the base asphalt is heated and softened to obtain preheated base asphalt, 0.2-2 parts by mass of the amine anti-stripping agent is diluted with 10-50 parts by mass of absolute ethyl alcohol and then added into the preheated base asphalt, and the mixture is uniformly stirred at 150-170 ℃.
The detailed implementation mode is ten: the seventh embodiment is different from the ninth embodiment in that 3 to 10 parts by mass of a silane coupling agent, 20 to 50 parts by mass of anhydrous ethanol and 50 to 75 parts by mass of water are mixed in the third step, and the mixture is fully stirred at a stirring speed of 1000 to 3000r/min and at a temperature of 50 to 90 ℃ for 30 to 90 minutes.
The concrete implementation mode eleven: the seventh embodiment is different from the seventh embodiment to the tenth embodiment in that 75 to 90 parts by mass of RAP treated by a silane coupling agent, 4 to 20 parts by mass of stone chips, 3 to 5 parts by mass of mineral powder, 0.3 to 1.5 parts by mass of zinc oxide powder and 1 to 2 parts by mass of cement are put into a mixing pot in the fifth embodiment, 2 to 10 parts by mass of water are added into the mixing pot, and after mixing, 1 to 5 parts by mass of foamed asphalt is sprayed into the mixing pot and then mixed.
The first embodiment is as follows: the preparation method of the water damage resistant foamed asphalt mixture of the embodiment is implemented according to the following steps:
firstly, putting No. 90 petroleum asphalt in an oven at 140 ℃ for 2 hours for softening to obtain preheated matrix asphalt, diluting an amine anti-stripping agent by using absolute ethyl alcohol, adding the diluted amine anti-stripping agent into the preheated matrix asphalt, stirring for 30 minutes at the temperature of 160 ℃ and the stirring speed of 200r/min to volatilize the absolute ethyl alcohol, and uniformly dispersing the anti-stripping agent in the asphalt to obtain the heated matrix asphalt;
secondly, the foamed asphalt generators are divided into two types: the centralized generator and the distributed generator are characterized in that the centralized generator is adopted to divide the heated matrix asphalt into two strong high-speed high-pressure asphalt jet flows, a large low-speed countercurrent area is formed around the high-speed high-pressure asphalt jet flows, and a high-pressure diaphragm pump is adopted to spray high-stress foaming water to enter a low-speed countercurrent area around the asphalt jet flows, so that the hot asphalt and the foaming water are effectively mixed to initially form foamed asphalt; dividing the primarily prepared foamed asphalt into a plurality of branches by adopting a distributed generator, respectively entering an asphalt foaming cavity, and carrying out secondary foaming to obtain foamed asphalt;
mixing and stirring a KH550 type silane coupling agent, absolute ethyl alcohol and water to obtain a silane coupling agent solution, fully stirring at a stirring speed of 3000r/min and at a temperature of 50 ℃ for 60min to hydrolyze the silane coupling agent to generate silanol molecules, uniformly spraying the silane coupling agent solution on the surface of RAP to perform condensation and oligomerization reactions on the silanol molecules to form a net structure, then placing the wetted RAP in an oven at 40 ℃ to dry the wetted RAP to fully cure the silanol, and drying to obtain RAP treated by the silane coupling agent;
weighing RAP, stone chips, mineral powder, zinc oxide powder and cement which are treated by the silane coupling agent as aggregate raw materials;
and fifthly, putting 90 parts by mass of RAP treated by the silane coupling agent, 4 parts by mass of stone chips, 3 parts by mass of mineral powder, 1.5 parts by mass of zinc oxide powder and 1.5 parts by mass of cement into a mixing pot, adding 5 parts by mass of water, mixing for 30s, spraying 2 parts by mass of foamed asphalt, and mixing for 30s to obtain the water damage resistant foamed asphalt mixture.
In the foamed asphalt obtained in the second step of this example, the mass parts of the matrix asphalt are 95 parts, the mass parts of the foaming water are 2.5 parts, and the mass parts of the amine anti-stripping agent are 0.3 part.
In the third step of this example, the silane coupling agent solution is prepared by mixing and stirring 6 parts of silane coupling agent, 30 parts of anhydrous ethanol and 64 parts of water. And in the third step, the spraying amount of the silane coupling agent solution accounts for 2 percent of the mass of the RAP.
In this example, a dry-wet splitting test, a dry shrinkage test and a semi-circle bending test were performed on a molded water damage resistant foamed asphalt mixture according to the molding standard of a small and medium-sized marshall test piece in the test specification for road engineering asphalt and asphalt mixtures (JTG E20-2011), and compared with the test results of a foamed asphalt mixture prepared by a conventional method and not containing an additive.
The performance indexes of the water damage resistant foamed asphalt cold recycling mixture and the common foamed asphalt mixture prepared in the embodiment are as follows:
| mix type | Dry cleavingStrength (MPa) | Wet splitting Strength (MPa) | Fracture toughness (MPa. m)0.5) |
| General purpose | 0.57 | 0.53 | 0.257 |
| Water damage resistant type | 0.67 | 0.59 | 0.429 |
| Increment of | 17.54％ | 11.32％ | 66.93％ |
The dry-wet splitting strength and the fracture toughness of the water damage resistant foamed asphalt cold-recycling mixture are superior to those of a common foamed asphalt mixture, wherein the dry-wet splitting strength is used for evaluating the water stability of the mixture, and the fracture toughness is used for evaluating the low-temperature performance of the mixture, so that the water damage resistance of the mixture is indirectly represented.
Example two: the preparation method of the water damage resistant foamed asphalt mixture of the embodiment is implemented according to the following steps:
firstly, putting No. 90 asphalt in an oven at 140 ℃ for 2 hours for softening to obtain preheated matrix asphalt, diluting an amine anti-stripping agent by using absolute ethyl alcohol, adding the diluted amine anti-stripping agent into the preheated matrix asphalt, stirring for 30 minutes at 160 ℃ and at a stirring speed of 200r/min to volatilize the absolute ethyl alcohol, and uniformly dispersing the anti-stripping agent in the asphalt to obtain the heated matrix asphalt;
secondly, a centralized generator is adopted to divide the heated matrix asphalt into two strong high-speed high-pressure asphalt jet flows, a large low-speed countercurrent area is formed around the high-speed high-pressure asphalt jet flows, and a high-pressure diaphragm pump is adopted to spray high-stress foaming water to enter a low-speed countercurrent area around the asphalt jet flows, so that the hot asphalt and the foaming water are effectively mixed to primarily form foamed asphalt; dividing the primarily prepared foamed asphalt into a plurality of branches by adopting a distributed generator, respectively entering an asphalt foaming cavity, and carrying out secondary foaming to obtain foamed asphalt;
mixing and stirring a silane coupling agent, absolute ethyl alcohol and water to obtain a silane coupling agent solution, fully stirring at a stirring speed of 3000r/min and at a temperature of 50 ℃ for 60min to hydrolyze the silane coupling agent to generate silanol molecules, uniformly spraying the silane coupling agent solution on the surface of RAP to perform condensation and oligomerization reactions on the silanol molecules to form a net structure, then drying the wetted RAP in a drying oven at 40 ℃ to fully cure the silanol, and drying to obtain RAP treated by the silane coupling agent;
weighing RAP, stone chips, mineral powder, zinc oxide powder and cement which are treated by the silane coupling agent as aggregate raw materials;
and fifthly, putting 90 parts by mass of RAP treated by the silane coupling agent, 4 parts by mass of stone chips, 4 parts by mass of mineral powder, 0.5 part by mass of zinc oxide powder and 1.5 parts by mass of cement into a mixing pot, adding 5 parts by mass of water, mixing for 30s, spraying 2 parts by mass of foamed asphalt, and mixing for 30s to obtain the water damage resistant foamed asphalt mixture.
In the foamed asphalt obtained in the second step of this example, the mass parts of the matrix asphalt are 95 parts, the mass parts of the foaming water are 2.5 parts, and the mass parts of the amine anti-stripping agent are 0.6 part.
In the third step of this example, the silane coupling agent solution is prepared by mixing and stirring 5 parts of silane coupling agent, 45 parts of anhydrous ethanol and 50 parts of water. And in the third step, the spraying amount of the silane coupling agent solution accounts for 2.5 percent of the mass of the RAP.
The performance indexes of the water damage resistant foamed asphalt cold recycling mixture and the common foamed asphalt mixture prepared in the embodiment are as follows:
| mix type | Dry splitting Strength (MPa) | Wet splitting Strength (MPa) | Fracture toughness (MPa. m)0.5) |
| General purpose | 0.57 | 0.53 | 0.257 |
| Water damage resistant type | 0.71 | 0.64 | 0.314 |
| Increment of | 24.56％ | 20.75％ | 22.18％ |
The dry-wet splitting strength and the fracture toughness of the water damage resistant foamed asphalt cold-recycling mixture are superior to those of a common foamed asphalt mixture, wherein the dry-wet splitting strength is used for evaluating the water stability of the mixture, and the fracture toughness is used for evaluating the low-temperature performance of the mixture, so that the water damage resistance of the mixture is indirectly represented.
Example three: the preparation method of the water damage resistant foamed asphalt mixture of the embodiment is implemented according to the following steps:
firstly, putting No. 90 asphalt in an oven at 140 ℃ for 2 hours for softening to obtain preheated matrix asphalt, diluting an amine anti-stripping agent by using absolute ethyl alcohol, adding the diluted amine anti-stripping agent into the preheated matrix asphalt, stirring for 30 minutes at 160 ℃ and at a stirring speed of 200r/min to volatilize the absolute ethyl alcohol, and uniformly dispersing the anti-stripping agent in the asphalt to obtain the heated matrix asphalt;
secondly, a centralized generator is adopted to divide the heated matrix asphalt into two strong high-speed high-pressure asphalt jet flows, a large low-speed countercurrent area is formed around the high-speed high-pressure asphalt jet flows, and a high-pressure diaphragm pump is adopted to spray high-stress foaming water to enter a low-speed countercurrent area around the asphalt jet flows, so that the hot asphalt and the foaming water are effectively mixed to primarily form foamed asphalt; dividing the primarily prepared foamed asphalt into a plurality of branches by adopting a distributed generator, respectively entering an asphalt foaming cavity, and carrying out secondary foaming to obtain foamed asphalt;
mixing and stirring a silane coupling agent, absolute ethyl alcohol and water to obtain a silane coupling agent solution, fully stirring at a stirring speed of 3000r/min and at a temperature of 50 ℃ for 60min to hydrolyze the silane coupling agent to generate silanol molecules, uniformly spraying the silane coupling agent solution on the surface of RAP to perform condensation and oligomerization reactions on the silanol molecules to form a net structure, then drying the wetted RAP in a drying oven at 40 ℃ to fully cure the silanol, and drying to obtain RAP treated by the silane coupling agent;
weighing RAP, stone chips, mineral powder, zinc oxide powder and cement which are treated by the silane coupling agent as aggregate raw materials;
and fifthly, putting 90 parts by mass of RAP treated by the silane coupling agent, 4 parts by mass of stone chips, 4.2 parts by mass of mineral powder, 0.3 part by mass of zinc oxide powder and 1.5 parts by mass of cement into a mixing pot, adding 5 parts by mass of water, mixing for 30s, spraying 2 parts by mass of foamed asphalt, and mixing for 30s to obtain the water damage resistant foamed asphalt mixture.
In the foamed asphalt obtained in the second step of this example, the mass parts of the matrix asphalt are 95 parts, the mass parts of the foaming water are 2.5 parts, and the mass parts of the amine anti-stripping agent are 1 part.
In the third step of this example, the silane coupling agent solution is prepared by mixing and stirring 7 parts of silane coupling agent, 21 parts of anhydrous ethanol and 72 parts of water. And in the third step, the spraying amount of the silane coupling agent solution accounts for 3 percent of the mass of the RAP.
The performance indexes of the water damage resistant foamed asphalt cold recycling mixture and the common foamed asphalt mixture prepared in the embodiment are as follows:
| mix type | Dry splitting Strength (MPa) | Wet splitting Strength (MPa) | Fracture toughness (MPa. m)0.5) |
| General purpose | 0.57 | 0.53 | 0.257 |
| Water damage resistant type | 0.63 | 0.58 | 0.326 |
| Increment of | 10.53％ | 9.43％ | 26.84％ |
The dry-wet splitting strength and the fracture toughness of the water damage resistant foamed asphalt cold-recycling mixture are superior to those of a common foamed asphalt mixture, wherein the dry-wet splitting strength is used for evaluating the water stability of the mixture, and the fracture toughness is used for evaluating the low-temperature performance of the mixture, so that the water damage resistance of the mixture is indirectly represented.
Claims (10)
1. The water damage resistant foamed asphalt mixture is characterized by being prepared by mixing aggregate, water and foamed asphalt, wherein the aggregate comprises 75-90 parts by mass of asphalt mixture reclaimed materials, 4-20 parts by mass of stone chips, 3-5 parts by mass of mineral powder, 1-2 parts by mass of cement, 0.3-1.5 parts by mass of zinc oxide powder and 1-5 parts by mass of coupling agent solution; wherein the foamed asphalt contains amine anti-stripping agent.
2. The water damage resistant foamed asphalt mixture according to claim 1, wherein said coupling agent is a silane coupling agent.
3. The water damage resistant foamed asphalt mixture according to claim 1, wherein the coupling agent solution is prepared by mixing a coupling agent, absolute ethanol and water.
4. The water damage resistant foamed asphalt mixture according to claim 3, wherein the coupling agent solution is prepared by mixing 3-10 parts of coupling agent, 20-50 parts of absolute ethyl alcohol and 50-75 parts of water in parts by mass.
5. The water damage resistant foamed asphalt mixture according to claim 1, wherein the foamed asphalt comprises 90-98 parts by weight of base asphalt, 1-10 parts by weight of foaming water, 0.2-2 parts by weight of amine anti-stripping agent and 10-50 parts by weight of absolute ethyl alcohol.
6. The water damage resistant foamed asphalt mixture according to claim 1, wherein the amine anti-stripping agent is epoxidized rosin tetra-substituted diethylenetriamine, epoxidized octadecanoic acid tetra-substituted diethylenetriamine or epoxidized rosin octadecanoic acid di-substituted diethylenetriamine.
7. The preparation method of the water damage resistant foamed asphalt mixture is characterized by comprising the following steps:
firstly, heating and softening matrix asphalt to obtain preheated matrix asphalt, diluting an amine anti-stripping agent by using absolute ethyl alcohol, adding the diluted amine anti-stripping agent into the preheated matrix asphalt, and uniformly stirring at 150-170 ℃ to obtain the heated matrix asphalt;
secondly, mixing the heated matrix asphalt with foaming water by adopting a foamed asphalt generator for foaming to obtain foamed asphalt;
mixing and stirring 3-10 parts of silane coupling agent, 20-50 parts of anhydrous ethanol and 50-75 parts of water according to the mass parts to obtain silane coupling agent solution, uniformly spraying the silane coupling agent solution on the surface of the reclaimed asphalt material, and drying to obtain RAP treated by the silane coupling agent;
weighing 75-90 parts by mass of RAP treated by the silane coupling agent, 4-20 parts by mass of stone chips, 3-5 parts by mass of mineral powder, 0.3-1.5 parts by mass of zinc oxide powder and 1-2 parts by mass of cement as aggregate raw materials;
fifthly, putting the aggregate raw materials in the fourth step into a mixing pot, adding water, mixing, spraying foamed asphalt, and mixing to obtain the water damage resistant foamed asphalt mixture.
8. The method for preparing the water damage resistant foamed asphalt mixture according to claim 7, wherein in the first step, 90-98 parts by weight of the base asphalt is heated and softened to obtain preheated base asphalt, 0.2-2 parts by weight of the amine anti-stripping agent is diluted by 10-50 parts by weight of absolute ethyl alcohol and then added into the preheated base asphalt, and the mixture is uniformly stirred at 150-170 ℃.
9. The preparation method of the water damage resistant foamed asphalt mixture according to claim 7, wherein in the third step, 3-10 parts by mass of the silane coupling agent, 20-50 parts by mass of the anhydrous ethanol and 50-75 parts by mass of the water are mixed, and the mixture is fully stirred at a stirring speed of 1000-3000 r/min and at a temperature of 50-90 ℃ for 30-90 min.
10. The method for preparing the water damage resistant foamed asphalt mixture according to claim 7, wherein in the fifth step, 75-90 parts by mass of RAP treated with the silane coupling agent, 4-20 parts by mass of stone chips, 3-5 parts by mass of mineral powder, 0.3-1.5 parts by mass of zinc oxide powder and 1-2 parts by mass of cement are placed in a mixing pot, 2-10 parts by mass of water are added, and after mixing, 1-5 parts by mass of foamed asphalt are sprayed and mixed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010378578.6A CN111592285A (en) | 2020-05-07 | 2020-05-07 | Water damage resistant foam asphalt mixture and preparation method thereof |
Applications Claiming Priority (1)
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| CN114292066A (en) * | 2021-12-17 | 2022-04-08 | 长安大学 | High-strength foamed asphalt cold-recycling mixture and preparation method and application thereof |
| CN116837692A (en) * | 2023-07-19 | 2023-10-03 | 北京市政路桥建材集团有限公司通州沥青厂 | Asphalt mixture preparation process and preparation equipment |
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| CN113213823A (en) * | 2021-04-26 | 2021-08-06 | 哈尔滨工业大学 | Magnetic cement mortar damage detection sensor and manufacturing method and application thereof |
| CN114292066A (en) * | 2021-12-17 | 2022-04-08 | 长安大学 | High-strength foamed asphalt cold-recycling mixture and preparation method and application thereof |
| CN114292066B (en) * | 2021-12-17 | 2023-07-07 | 长安大学 | High-strength foam asphalt cold-recycling mixture and preparation method and application thereof |
| CN116837692A (en) * | 2023-07-19 | 2023-10-03 | 北京市政路桥建材集团有限公司通州沥青厂 | Asphalt mixture preparation process and preparation equipment |
| CN116837692B (en) * | 2023-07-19 | 2024-01-02 | 北京市政路桥建材集团有限公司通州沥青厂 | Asphalt mixture preparation equipment |
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