CN117585940B - Preparation method of rock asphalt and SBS modified asphalt composite modified asphalt mixture - Google Patents
Preparation method of rock asphalt and SBS modified asphalt composite modified asphalt mixture Download PDFInfo
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- CN117585940B CN117585940B CN202311292097.3A CN202311292097A CN117585940B CN 117585940 B CN117585940 B CN 117585940B CN 202311292097 A CN202311292097 A CN 202311292097A CN 117585940 B CN117585940 B CN 117585940B
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- 239000010426 asphalt Substances 0.000 title claims abstract description 253
- 239000011435 rock Substances 0.000 title claims abstract description 93
- 239000000203 mixture Substances 0.000 title claims abstract description 80
- 239000002131 composite material Substances 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 238000002156 mixing Methods 0.000 claims abstract description 40
- 239000000463 material Substances 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 16
- 230000008859 change Effects 0.000 claims abstract description 7
- 230000008569 process Effects 0.000 claims abstract description 7
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 6
- 238000007580 dry-mixing Methods 0.000 claims abstract description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 39
- 239000011707 mineral Substances 0.000 claims description 39
- 239000000843 powder Substances 0.000 claims description 28
- 239000011800 void material Substances 0.000 claims description 13
- 238000005056 compaction Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000011049 filling Methods 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 5
- 238000012216 screening Methods 0.000 claims description 4
- 238000003786 synthesis reaction Methods 0.000 claims description 4
- 230000007246 mechanism Effects 0.000 claims description 3
- 238000010998 test method Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 238000000605 extraction Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 2
- 230000009977 dual effect Effects 0.000 abstract description 2
- 239000012615 aggregate Substances 0.000 description 51
- 238000004519 manufacturing process Methods 0.000 description 8
- 230000004048 modification Effects 0.000 description 7
- 238000012986 modification Methods 0.000 description 7
- 230000032683 aging Effects 0.000 description 5
- 238000007385 chemical modification Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000006750 UV protection Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 239000005445 natural material Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
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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
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
-
- 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
-
- 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
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Road Paving Structures (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention provides a preparation method of a rock asphalt and SBS modified asphalt composite modified asphalt mixture, which adopts two cementing materials of rock asphalt and SBS modified asphalt, controls the space formation state of the mixture according to the change process of volume parameters, adopts the thickness change state of asphalt film under the dual action of the two cementing materials, controls the mixing proportion of the rock asphalt and the SBS modified asphalt, controls the volume parameters, ensures the stability of the mixture after the rock asphalt is added, enables the mixture to meet the requirement of design compactness, increases the strength of the mixture, controls the thickness change process of the asphalt film, carries out dry mixing on the rock asphalt and aggregate first, enables the asphalt film in the rock asphalt to be transferred into the aggregate more uniformly, enables the two asphalt to exert better wrapping effect, ensures that the cementing materials act in the best state in the mixture, has larger promotion of the performances of the asphalt mixture in all aspects, and can greatly promote the service life of the pavement when the prepared asphalt mixture is used for pavement.
Description
Technical Field
The invention relates to the technical field of road engineering, in particular to a preparation method of a rock asphalt and SBS modified asphalt composite modified asphalt mixture.
Background
With the gradual increase of traffic load and more frequent extreme climate, asphalt pavement is subjected to more serious impact actions in terms of environment, load and the like, and due to various factors such as complexity, variability, construction quality control and the like of asphalt pavement engineering, after a plurality of highways are built, diseases such as ruts, cracks, pits, looseness and the like with different degrees appear in a train for less than 3-5 years, the service level of the pavement is seriously influenced, the expected service life of the pavement is shortened, and great economic loss is caused.
The cementing material in the asphalt pavement mixture mainly adopts SBS modified asphalt, high-viscosity modified asphalt, rubber asphalt and other materials, and the modified asphalt materials have a certain effect on improving the performance of the mixture, however, the materials are mainly chemically modified, have insufficient ultraviolet resistance and ageing resistance, and can be used for a long time to realize faster performance attenuation instead of a durable material. The rock asphalt is a product of hundreds of millions years, is composed of ash and natural asphalt, is very well compatible with petroleum asphalt based on the principle of similar compatibility, has high nitrogen content, does not contain wax and has higher softening point, and can replace part of matrix asphalt as a modifier, meanwhile, the softening point of the asphalt is improved, and the ash rich in carbonate can increase the binding force of the asphalt and aggregate.
SBS modified asphalt is the most common type of asphalt pavement cementing materials in China, has better high-temperature performance, but has insufficient ageing capacity and low-temperature performance, rock asphalt is a natural material, has good ageing performance, SBS modified asphalt is a chemical modification, rock asphalt is doped into a physical modification, the SBS modified asphalt and the rock asphalt can be effectively combined, double modification is carried out, the high-temperature performance and the low-temperature performance are further enhanced, the addition of the rock asphalt improves the ageing resistance, the ultraviolet resistance and the fatigue performance of the mixture, however, the addition of the two kinds of asphalt has larger influence on the space volume composition of the mixture, the adhesion state of the cementing materials and the like, so that the performance of the asphalt mixture is difficult to control, and the difficulty of production and preparation is larger, therefore, an asphalt mixture production and preparation method which uses volume parameter control and mutual accumulation of the two cementing materials is needed to ensure that the asphalt mixture has double superposition function improvement, thereby improving the durability of asphalt pavement is urgently provided.
Disclosure of Invention
Aiming at the defects existing in the production and preparation process of the rock asphalt and SBS modified asphalt composite modified asphalt mixture, the invention aims to provide a production and preparation method combining volume parameter control and double-cementing material bonding and wrapping state.
The technical problems to be solved by the invention are realized by adopting the following technical scheme:
The preparation method of the rock asphalt and SBS modified asphalt composite modified asphalt mixture comprises the following steps:
(1) The composite modified asphalt mixture comprises: the method comprises the steps of screening aggregates and rock asphalt of each grade, determining aggregate and grading composition of each grade, and determining ash content and ash grading composition of the rock asphalt and the asphalt;
(2) The ash and mineral powder in the rock asphalt are filled in the gaps formed by coarse and fine aggregates, the gaps after filling are the gap rate of asphalt mixture mineral aggregate, the gaps formed by filling SBS modified asphalt and asphalt in the rock asphalt in the gap rate of the mineral aggregate are the gap rate of the asphalt mixture, and the mixing proportion of the aggregates, the rock asphalt and the mineral powder is determined by combining the composition mechanism and the volume parameters of the mixture;
(3) In the preparation process, asphalt in the rock asphalt is transferred to aggregate to wrap the surface of the aggregate to form an asphalt film, after SBS modified asphalt and mineral powder are added, the asphalt film is adsorbed to the surface by the rock asphalt, mineral powder and aggregate to form a new asphalt film, and according to the thickness change of the asphalt film, the blending proportion of SBS modified asphalt and rock asphalt of the mixture is determined through the average asphalt film thickness and the specific surface area of the mineral aggregate;
(4) The mixing station is used for mixing the rock asphalt and SBS modified asphalt composite modified asphalt mixture, and the mixing process is as follows: heating coarse aggregate and fine aggregate in a heating roller, and then adding rock asphalt and dry-mixing for 5-10 s; and then adding the mineral powder and SBS modified asphalt into a mixing cylinder, and wet-mixing for 35-45 s.
The invention further discloses the following technology:
Preferably, the proportion of the rock asphalt ash to the asphalt is determined by a drawer test method, and the ash after the drawer is screened to determine the grading composition of the ash in the rock asphalt.
Preferably, the void ratio formed by coarse and fine aggregates is calculated by performing Marshall compaction 100 times on one surface according to the blending proportion formed by grading coarse and fine aggregates, and the void ratio of the aggregates is calculated by compaction density and aggregate synthesis density according to the following formula:
wherein: VVS-void fraction of coarse and fine aggregates,%; ρ js —aggregate compaction density, g/cm3; ρ j -aggregate composite density, g/cm3.
Preferably, the blending proportion of the aggregate, the rock asphalt and the mineral powder is determined according to the following formula:
Pj+Pk+α×Py＝100
Wherein: p j -content of aggregate,%; p k -mineral powder content,%;
P y -rock asphalt content,%; p a -amount of SBS modified asphalt,%;
Alpha-ash content in rock asphalt,%; ρ hy —ash density in rock asphalt, g/cm3;
ρ ly —asphalt density in rock asphalt, g/cm3;
ρ a —SBS modified asphalt density, g/cm3; VMA-mineral aggregate gap rate,%;
VV-void fraction of asphalt mixture,%.
Preferably, the blending ratio of the rock asphalt to the SBS modified asphalt is calculated according to the following formula:
Pa＝(u2-u1)×(α×Py×SAy+Pj×SAj+Pk×SAk)×ρa
SA＝0.41+0.0041a+0.0082b+0.0164c+0.0287d+0.0614e+0.1229f+0.3277g
wherein: u 0, thickness of asphalt film in rock asphalt, um;
u 1, the average asphalt film thickness, um, of asphalt in rock asphalt after asphalt is transferred to aggregate;
u 2 -average asphalt film thickness, um, of the asphalt mixture prepared;
SA y, the specific surface area of rock asphalt ash, m2/k g;SAj, the specific surface area of aggregate, m2/kg;
SA k, mineral powder specific surface area, m2/kg; SA-specific surface area, m2/kg;
a. b, c, d, e, f, g is 4.75mm and below each sieve aperture passing rate.
Preferably, the maximum particle size of the rock asphalt is not more than 4.75mm, and the content of asphalt in the rock asphalt is not less than 25%.
Preferably, the thickness of the asphalt film of the prepared composite modified asphalt mixture is 7-10 um.
Preferably, the void ratio of the composite modified asphalt mixture is 3-5%, and the void ratio of the mineral aggregate is 12-15%.
Preferably, in the mixing process, the heating temperature of aggregate is 180-200 ℃, the rock asphalt cold material is added into a mixing cylinder to be dry-mixed with the heated aggregate, the heating temperature of SBS modified asphalt is 160-170 ℃, the temperature of the mixing cylinder is kept at 165-175 ℃, and the discharging temperature of the mixing cylinder is 165-175 ℃.
The beneficial effects of the invention are as follows:
The invention adopts the volume parameter to control the space formation process of each component of the mixture, so as to determine the blending proportion of rock asphalt, aggregate and mineral powder, avoid the addition of ash in the rock asphalt, and prop up the state of the mixture, so that the mixture meets the requirement of the design compactness, ensure the better strength of the asphalt mixture, and increase the load resistance and the better stability of the mixture.
The invention provides a production and preparation method of a rock asphalt and SBS modified asphalt composite modified asphalt mixture, which adopts the asphalt film thickness change state under the dual action of two cementing materials, controls the mixing proportion of the rock asphalt and the SBS modified asphalt, ensures that the two asphalts can exert better wrapping effect, ensures that the cementing materials act in the mixture in an optimal state, thereby exerting the composite modification means to the greatest extent and improving the performances of the asphalt mixture in all aspects.
According to the production and preparation method of the rock asphalt and SBS modified asphalt composite modified asphalt mixture, aggregates and the rock asphalt are firstly dry-mixed in the production process, so that asphalt in the rock asphalt is firstly transferred to the aggregates, more uniform natural asphalt films are wrapped on the surfaces of the aggregates, the ageing resistance and the bonding strength of the mixture are enhanced, the specific surface area of mineral powder is large, the mineral powder is added into the rock asphalt with early time and an adsorption angle, and the double modification effect is difficult to develop.
The production and preparation method of the rock asphalt and SBS modified asphalt composite modified asphalt mixture provided by the invention combines physical modification of the rock asphalt and chemical modification of the asphalt by SBS, avoids mutual interference of the physical modification and the chemical modification of the SBS on the asphalt, is beneficial to exerting respective advantages, and thus improves the performance of the prepared asphalt mixture
Detailed Description
In order that the manner in which the above recited features, objects and advantages of the present invention are obtained will become readily apparent, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. Based on the examples in the embodiments, those skilled in the art can obtain other examples without making any inventive effort, which fall within the scope of the invention.
The preparation method of the rock asphalt and SBS modified asphalt composite modified asphalt mixture comprises the steps of screening aggregate and mineral powder, wherein the result is as follows:
TABLE 1 raw material sieving results
The drawer test method is adopted to determine the asphalt content in the rock asphalt, and the aggregate after the drawer is screened, and the result is as follows:
Table 2 rock asphalt drawer screening results
The densities of the raw materials are as follows:
TABLE 3 raw material density
Performing grading synthesis of aggregate, and determining the proportion of the aggregate to be: 1 #: 2 #: 3# =48:28:14, and the aggregate composite density ρ j＝2.682kg/cm3 is calculated. According to the blending proportion of coarse and fine aggregate grading composition, a Marshall compaction test is carried out, single-sided compaction is carried out 100 times, the compaction density is measured to be 2.01kg/cm 3', and the aggregate void ratio is calculated through the compaction density and the aggregate synthesis density, and the formula is as follows:
The gap after filling is 14% of the gap rate VMA of the asphalt mixture mineral aggregate, the gap rate VV of the asphalt mixture is 4% of the gap rate VMA of the asphalt mixture, and the mixing proportion of the aggregate, the rock asphalt and the mineral powder is determined according to the following formula by combining the composition mechanism and the volume parameters of the mixture:
Pj+Pk+0.7×Py＝100
The specific surface areas of the aggregates, the rock asphalt ash and the mineral powder are determined according to the following formula:
SA＝0.41+0.0041a+0.0082b+0.0164c+0.0287d+0.0614e+0.1229f+0.3277g
TABLE 4 calculation of specific surface area
| Type(s) | Aggregate material | Mineral powder | Rock asphalt ash |
| Specific surface area, m 2/kg | 1.94 | 41.45 | 29.9 |
According to the film forming theory of the asphalt mixture, in the preparation process, asphalt in the rock asphalt is transferred to aggregate to wrap the surface of the aggregate to form an asphalt film, after SBS modified asphalt and mineral powder are added, the asphalt film is adsorbed to the surface by the rock asphalt, mineral powder and the aggregate to form a new asphalt film, the thickness of the SBS modified asphalt film is 8.0um, and according to the thickness change of the asphalt film, the blending proportion of the rock asphalt and the SBS modified asphalt is calculated according to the following formula:
Pa＝(8-u1)×(0.7×Py×29.9+Pj×1.94+Pk×41.45)×1.06×10-3
The method comprises the following steps of: aggregate amount P j =87.9%, mineral powder amount P j =10%, rock asphalt amount P j =3.0%, and mixture SBS modified asphalt amount P a =3.7%;
Taking SBS modified asphalt with the dosage of 3.4%, 3.7% and 4.0% to prepare a Marshall test piece under the following conditions:
Adding aggregate into an oven and heating to 190-210 ℃;
adding 3% of rock asphalt into a mixing tank, and dry-mixing with aggregate for 8s;
The heating temperature of the SBS modified asphalt is 160-170 ℃;
adding SBS modified asphalt and mineral powder into a mixing cylinder, uniformly mixing the SBS modified asphalt and the mineral powder with aggregate and rock asphalt in the mixing cylinder for 40s, and ensuring that the mixing temperature is 165-175 ℃ and the mixing time is 40s;
Taking the mixture obtained in the step at 165-175 ℃ out of the pot, and forming at 165-170 ℃.
The Marshall test results are shown in Table 5.
TABLE 5 Marshall test results
When the void ratio of the mixture is 4.0%, the optimal oil-stone ratio is 3.85%, road performance verification is carried out, and various performance results of the rock asphalt and SBS modified asphalt composite modified asphalt mixture are shown in table 6.
TABLE 6 road performance test results
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above-described embodiments, and that the above-described embodiments and descriptions are only preferred embodiments of the present invention, and are not intended to limit the invention, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A preparation method of a rock asphalt and SBS modified asphalt composite modified asphalt mixture is characterized by comprising the following steps: the method comprises the following steps:
(1) The composite modified asphalt mixture comprises: the method comprises the steps of screening aggregates and rock asphalt of each grade, determining aggregate and grading composition of each grade, and determining ash content and ash grading composition of the rock asphalt and the asphalt;
(2) The ash and mineral powder in the rock asphalt are filled in the gaps formed by coarse and fine aggregates, the gaps after filling are the gap rate of asphalt mixture mineral aggregate, the gaps formed by filling SBS modified asphalt and asphalt in the rock asphalt in the gap rate of the mineral aggregate are the gap rate of the asphalt mixture, and the mixing proportion of the aggregates, the rock asphalt and the mineral powder is determined by combining the composition mechanism and the volume parameters of the mixture;
(3) In the preparation process, asphalt in the rock asphalt is transferred to aggregate to wrap the surface of the aggregate to form an asphalt film, after SBS modified asphalt and mineral powder are added, the asphalt film is adsorbed to the surface by the rock asphalt, mineral powder and aggregate to form a new asphalt film, and according to the thickness change of the asphalt film, the blending proportion of SBS modified asphalt and rock asphalt of the mixture is determined through the average asphalt film thickness and the specific surface area of the mineral aggregate;
(4) The mixing station is used for mixing the rock asphalt and SBS modified asphalt composite modified asphalt mixture, and the mixing process is as follows: heating coarse aggregate and fine aggregate in a heating roller, and then adding rock asphalt and dry-mixing for 5-10 s; adding mineral powder and SBS modified asphalt into a mixing cylinder, and wet-mixing for 35-45 s;
the void ratio formed by coarse and fine aggregates is calculated by carrying out Marshall compaction test for 100 times on one side according to the blending proportion formed by grading the coarse and fine aggregates and calculating the void ratio of the aggregates by compaction density and aggregate synthesis density, and the formula is as follows:
wherein: VVS-void fraction of coarse and fine aggregates,%; ρ js —aggregate compaction density, g/cm 3;ρj —aggregate composite density, g/cm 3;
The mixing proportion of aggregate, rock asphalt and mineral powder is determined according to the following formula:
Pj+Pk+α×Py＝100
Wherein: p j -content of aggregate,%; p k -mineral powder content,%;
P y -rock asphalt content,%; p a -amount of SBS modified asphalt,%;
alpha-ash content in rock asphalt,%; ρ hy —ash density in rock asphalt, g/cm 3;
ρ ly —asphalt density in rock asphalt, g/cm 3;
ρ a —SBS modified asphalt density, g/cm 3; VMA-mineral aggregate gap rate,%;
VV-void fraction of asphalt mixture,%;
the blending proportion of the rock asphalt and the SBS modified asphalt is calculated according to the following formula:
Pa＝(u2-u1)×(α×Py×SAy+Pj×SAj+Pk×SAk)×ρa
SA＝0.41+0.0041a+0.0082b+0.0164c+0.0287d+0.0614e+0.1229f+0.3277g
wherein: u 0, thickness of asphalt film in rock asphalt, um;
u 1, the average asphalt film thickness, um, of asphalt in rock asphalt after asphalt is transferred to aggregate;
u 2 -average asphalt film thickness, um, of the asphalt mixture prepared;
SA y, the specific surface area of asphalt ash, m 2/kg;SAj, the specific surface area of aggregate, m 2/kg;
SA k -mineral powder specific surface area, m 2/kg; SA-specific surface area, m 2/kg;
a. b, c, d, e, f, g is 4.75mm and below each sieve aperture passing rate.
2. The method for preparing the rock asphalt and SBS modified asphalt composite modified asphalt mixture as defined in claim 1, which is characterized in that: the composition ratio of the rock asphalt ash and the asphalt adopts an extraction test method to determine the asphalt content in the rock asphalt, and the extracted ash is screened to determine the grading composition of the ash in the rock asphalt.
3. The method for preparing the rock asphalt and SBS modified asphalt composite modified asphalt mixture as defined in claim 1, which is characterized in that: the maximum particle size of the rock asphalt is not more than 4.75mm, and the content of asphalt in the rock asphalt is not less than 25%.
4. The method for preparing the rock asphalt and SBS modified asphalt composite modified asphalt mixture as defined in claim 1, which is characterized in that: the thickness of the asphalt film of the prepared composite modified asphalt mixture is 7-10 um.
5. The method for preparing the rock asphalt and SBS modified asphalt composite modified asphalt mixture as defined in claim 1, which is characterized in that: the void ratio of the composite modified asphalt mixture is 3-5%, and the gap ratio of mineral aggregate is 12-15%.
6. The method for preparing the rock asphalt and SBS modified asphalt composite modified asphalt mixture as defined in claim 1, which is characterized in that: in the mixing process, the heating temperature of aggregate is 180-200 ℃, the rock asphalt cold material is added into a mixing cylinder to be dry-mixed with the heated aggregate, the heating temperature of SBS modified asphalt is 160-170 ℃, the temperature of the mixing cylinder is kept at 165-175 ℃, and the discharging temperature of the mixing cylinder is 165-175 ℃.
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| CN106065558A (en) * | 2016-06-07 | 2016-11-02 | 同济大学 | Processing technology is mixed and stirred in a kind of BUTON rock asphalt modified asphalt mixture heating |
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