CN107337381B - Small-particle-size open-graded asphalt mixture for ultrathin overlay - Google Patents
Small-particle-size open-graded asphalt mixture for ultrathin overlay Download PDFInfo
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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
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/35—Toppings or surface dressings; Methods of mixing, impregnating, or spreading them
- E01C7/353—Toppings or surface dressings; Methods of mixing, impregnating, or spreading them with exclusively bituminous binders; Aggregate, fillers or other additives for application on or in the surface of toppings with exclusively bituminous binders, e.g. for roughening or clearing
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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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Abstract
The invention provides a small-particle-size graded asphalt mixture for ultrathin overlay, which comprises 85-92% of aggregate, 2-8% of filler and 5.5-7.5% of polymer modified asphalt by weight, wherein the nominal maximum particle size is 4.75mm, and the thickness of a pavement layer is 1.0-1.5 cm. Preferably, the aggregate is basalt or diabase. The filler is a mixture of limestone mineral powder and cement, and the mass ratio of the limestone mineral powder to the cement is 1: 1-3: 1. The polymer modified asphalt is POE composite modified asphalt, the zero shear viscosity at 60 ℃ is more than or equal to 30000Pa.s, and the softening point is more than or equal to 90 ℃. The small-particle-size open-graded asphalt mixture for the ultrathin overlay can reduce the overlay thickness, the engineering cost and the driving noise, can reduce the excessive environment and resource pressure of corresponding stones caused by large-scale application of SMA pavements by using two grades of hard stones of 3-5 mm and 0-3 mm, is ingenious in design, simple and convenient to prepare, low in cost and suitable for large-scale popularization and application.
Description
Technical Field
The invention relates to the technical field of road building materials, in particular to the technical field of an asphalt mixture for an ultrathin overlay, and particularly relates to a small-particle-size open-graded asphalt mixture for an ultrathin overlay.
Background
At present, roads in China generally face the problems of increasing traffic volume, large-scale development of vehicles, frequent prohibition of heavy load overload, serious vehicle channeling traffic and the like, and the functional damage of surface layers such as loosening, cracks, rapid attenuation of anti-skid performance and the like easily occur at the initial operation stage of asphalt pavements, so that the service performance and the service life of the pavements are influenced. Aiming at the problems that the surface layer of the asphalt road is functionally damaged and the structural strength of the road surface is good, which technical measure is selected to maintain the surface layer at any time and any place is one of hot spots of the research on the preventive maintenance technology of the asphalt road surface.
Preventive maintenance technologies represented by Novachip, micro-surfacing and the like are most commonly applied, and technical systems are mature, but still have some problems. The nominal maximum grain diameter of thin layer pavement such as Novachip and the like is generally 13.2mm or 9.5mm, and the pavement thickness is thicker and is 2.0 cm-3.0 cm. The micro-surfacing adopts a cold mixing construction process of modified emulsified asphalt, the pavement thickness is 1.0cm, but the nominal maximum grain diameter is 9.5mm, the coarse aggregate does not form an embedding and extruding structure, and the problems of high noise, easy generation of ruts, looseness and the like exist.
Accordingly, there is a need to provide an asphalt mixture for ultra-thin overlay that can reduce overlay thickness, reduce construction costs, and reduce driving noise.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a small-particle-size open-graded asphalt mixture for an ultrathin overlay surface, which can reduce the thickness of the overlay surface, the construction cost and the driving noise and is suitable for large-scale popularization and application.
The invention also aims to provide a small-particle-size graded asphalt mixture for ultrathin overlay surfaces, which can utilize hard stones of 3-5 mm and 0-3 mm to relieve the pressure of excessive environment and resources of corresponding stones caused by large-scale application of SMA (Stone cement asphalt mastic) pavements, and is suitable for large-scale popularization and application.
The invention also aims to provide a small-particle-size open-graded asphalt mixture for ultrathin overlay surfaces, which has the advantages of ingenious design, simple and convenient preparation and low cost, and is suitable for large-scale popularization and application.
In order to achieve the above purpose, the invention provides a small-particle size graded asphalt mixture for ultrathin finishing coat, which is characterized by comprising 85-92% of aggregate by weight, 2-8% of filler by weight and 5.5-7.5% of polymer modified asphalt by weight, wherein the nominal maximum particle size of the small-particle size graded asphalt mixture for ultrathin finishing coat is 4.75mm, and the pavement layer thickness of the small-particle size graded asphalt mixture for ultrathin finishing coat is 1.0-1.5 cm.
The aggregate may be any suitable aggregate, preferably the aggregate is basalt or diabase.
The aggregates may have any suitable composition, preferably the aggregates comprise a first aggregate of 3mm to 5mm continuous gradation and a second aggregate of 0mm to 3mm continuous gradation, the mass ratio of the first aggregate to the second aggregate being 75 to 80: 20 to 25.
The filler can be any suitable filler, and preferably is a mixture of limestone mineral powder and cement, and the mass ratio of the limestone mineral powder to the cement is 1: 1-3: 1.
The grading ranges of the aggregate and the filler can be determined according to needs, and preferably, the grading ranges of the aggregate and the filler meet the following requirements:
| mesh size (mm) | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| Percent passage (%) | 100 | 90～100 | 15～40 | 5～25 | 5～15 | 3～12 | 3～12 | 2～10 |
The polymer modified asphalt can be any suitable polymer modified asphalt, preferably, the polymer modified asphalt is POE composite modified asphalt, the zero shear viscosity at 60 ℃ of the POE composite modified asphalt is more than or equal to 30000Pa.s, and the softening point of the POE composite modified asphalt is more than or equal to 90 ℃.
The POE composite modified asphalt can have any suitable composition, and more preferably comprises hard asphalt with the penetration degree of 20-60, a modifier, a warm-mixing agent and an interface reinforcing agent, wherein the modifier is polyolefin elastomer POE, the modifier accounts for 8-14 wt% of the hard asphalt, and the warm-mixing agent accounts for 1-3 wt% of the hard asphalt; the interface reinforcing agent accounts for 0.3-1.0 wt% of the hard asphalt.
The penetration degree of the hard asphalt can be determined according to needs, and preferably, the penetration degree of the hard asphalt is 20-60, and the unit is 0.1 mm. The penetration is an index representing the degree of hardness and consistency of asphalt and the resistance to shear failure, and is an index reflecting the relative viscosity of asphalt under a given condition, and is a depth of 1/10 mm, which is a standard penetration depth into an asphalt sample at 25 ℃ for 5 seconds under a load of 100 g.
The hard asphalt can be any suitable hard asphalt, the warm-mix agent can be any suitable warm-mix agent, the interface enhancer can be any suitable interface enhancer, and further, the hard asphalt is asphalt No. 30 or asphalt No. 50; the warm mixing agent is polyethylene wax; the interface reinforcing agent is a silane coupling agent. The polyethylene wax is conventionally used in the field, is a mixture for synthesizing straight-chain aliphatic hydrocarbon, contains 40-120 carbon atoms of long-chain aliphatic hydrocarbon, and has a melting point of about 100 ℃. The silane coupling agent is used for enhancing the adhesion of the POE composite modified asphalt and the aggregate.
The melt index of the modifier can be determined according to needs, and further, the melt index of the modifier is 1dg/min to 10 dg/min.
The small-particle-size open graded asphalt mixture for the ultrathin overlay can have any suitable performance, preferably, the communication porosity of the small-particle-size open graded asphalt mixture for the ultrathin overlay is more than or equal to 12% in volume, the Kentaburg scattering loss of the small-particle-size open graded asphalt mixture for the ultrathin overlay is less than or equal to 10% in weight, the dynamic stability of the small-particle-size open graded asphalt mixture for the ultrathin overlay is more than or equal to 3500 times/mm, the split residual strength ratio of the small-particle-size open graded asphalt mixture for the ultrathin overlay is more than or equal to 85%, and the friction coefficient BPN of the small-particle-size open graded asphalt mixture for the ultrathin overlay is more than or equal to 85%20The water seepage coefficient of the small-particle-size open-graded asphalt mixture for the ultrathin cover surface is more than or equal to 2000 mL/min.
The invention has the beneficial effects that:
(1) the small-particle-size open-graded asphalt mixture for the ultrathin overlay comprises 85-92 wt% of aggregate, 2-8 wt% of filler and 5.5-7.5 wt% of polymer modified asphalt, the nominal maximum particle size of the small-particle-size open-graded asphalt mixture for the ultrathin overlay is 4.75mm, and the thickness of a paving layer is 1.0-1.5 cm, so that the overlay thickness can be reduced, the engineering cost is reduced, the traffic noise is reduced, and the small-particle-size open-graded asphalt mixture for the ultrathin overlay is suitable for large-scale popularization and application.
(2) The small-particle-size open-graded asphalt mixture for the ultrathin overlay comprises 85-92 wt% of aggregate, 2-8 wt% of filler and 5.5-7.5 wt% of polymer modified asphalt, the nominal maximum particle size of the small-particle-size open-graded asphalt mixture for the ultrathin overlay is 4.75mm, and the thickness of a pavement layer is 1.0-1.5 cm, so that the small-particle-size open-graded asphalt mixture can fully utilize two grades of hard stones of 3-5 mm and 0-3 mm, the excessive environment and resource pressure of corresponding stones caused by large-scale application of the pavement are reduced, and the small-particle-size open-graded asphalt mixture is suitable for large-scale popularization and application.
(3) The small-particle-size open-graded asphalt mixture for the ultrathin overlay comprises 85-92 wt% of aggregate, 2-8 wt% of filler and 5.5-7.5 wt% of polymer modified asphalt, the nominal maximum particle size of the small-particle-size open-graded asphalt mixture for the ultrathin overlay is 4.75mm, and the thickness of a paving layer is 1.0-1.5 cm, so that the small-particle-size open-graded asphalt mixture for the ultrathin overlay is ingenious in design, simple and convenient to prepare, low in cost and suitable for large-scale popularization and application.
These and other objects, features and advantages of the present invention will become more fully apparent from the following detailed description and appended claims, and may be realized by means of the instrumentalities, devices and combinations particularly pointed out in the appended claims.
Detailed Description
In order to clearly understand the technical contents of the present invention, the following examples are given in detail. All percentages are by weight unless otherwise indicated.
Example 1
The small-particle size open-graded asphalt mixture for ultrathin overlay of this example comprises 85% by weight of aggregate, 7.5% by weight of filler and 7.5% by weight of POE composite modified asphalt. The aggregate is basalt (formed by mixing 3 mm-5 mm continuous graded basalt and 0 mm-3 mm continuous graded basalt according to the mass ratio of 78: 22) produced by a gold-jar rich-foot stone rolling mill; the filler is a mixture of limestone mineral powder produced by Jiangxi Kuntai mineral powder factory and P.O 42.5.5 cement produced by Anhui sea snail cement GmbH, and the mass ratio is 1: 1.
The gradation of the aggregates used and of the fillers used is as follows:
| mesh size (mm) | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| Percent passage (%) | 100 | 95 | 40 | 25 | 15 | 12 | 12 | 10 |
The POE composite modified asphalt comprises the following components: 100 parts of No. 50 asphalt (China petrochemical and Zhenhai oil refining chemical Co., Ltd.), 10 parts of POE modifier (7256 of Dow chemical Co., USA, the melt index is 10dg/min), 2 parts of polyethylene wax (Sasobit of Sasol company in south Africa) and 0.5 part of interface enhancer (CG-301 of Jiangsu morning optical coupling agent Co., Ltd.).
The POE composite modified asphalt has the zero shear viscosity of 30000Pa.s at 60 ℃ and the softening point of 90 ℃.
The main performance test results for small particle size open graded asphalt mixes for ultra-thin finishes are shown in table 1. Wherein the test method of the communication void ratio refers to the appendix A of the technical specification of permeable asphalt pavement (CJJ/T190-2012), the test method of the dispersion loss of Kentabao refers to the test specification of road engineering asphalt and asphalt mixture (JTG E20-2011) T0733-2011, the test method of the dynamic stability refers to the test specification of road engineering asphalt and asphalt mixture (JTG E20-2011) T0719-2011, the test method of the freeze-thaw cleavage residual strength ratio refers to the test specification of road engineering asphalt and asphalt mixture (JTGE20-2011) T0729-2000, the test method of the water permeability coefficient refers to the test specification of road subgrade site (JTG E60-2008) T0971-2008, the test method of the structural depth refers to the test specification of road subgrade site (JTG 60-2008) T0961-1995-, the friction coefficient testing method refers to the field test regulation of road subgrade and pavement (JTG E60-2008) T0964-2008.
TABLE 1 Primary Performance test results for small particle size open graded asphalt mix for ultra-thin overlay
| Serial number | Technical index | Unit of | Technical Properties |
| 1 | Interconnected porosity | % by volume | 13.2 |
| 2 | Kentucky scatter loss | % by weight | 10 |
| 3 | Degree of dynamic stability | Sub/mm | 3500 |
| 4 | Ratio of freeze-thaw split residual strength | ％ | 85 |
| 5 | Coefficient of water permeability | mL/min | 2600 |
| 6 | Depth of construction | mm | 0.80 |
| 7 | Coefficient of friction BPN20 | — | 55 |
The nominal maximum particle size of the small-particle-size open-graded asphalt mixture in this example was 4.75mm, and the thickness of the pavement layer was 1.0 cm.
Example 2
The small-particle size open-graded asphalt mixture for ultrathin overlay of this example comprises 86.5% by weight of aggregate, 8% by weight of filler and 5.5% by weight of POE composite modified asphalt. The aggregate is basalt (formed by mixing 3 mm-5 mm continuous graded basalt and 0 mm-3 mm continuous graded basalt according to the mass ratio of 80: 20) produced by a gold-jar rich-foot stone rolling factory; the filler is a mixture of limestone mineral powder produced by Jiangxi Kuntai mineral powder factory and P.O42.5 cement produced by Anhui sea snail cement corporation, and the mass ratio is 3: 1.
The gradation of the aggregates used and of the fillers used is as follows:
| mesh size (mm) | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| Percent passage (%) | 100 | 90 | 21 | 11 | 9 | 9 | 9 | 8 |
The POE composite modified asphalt comprises the following components: 100 parts of No. 30 asphalt (China petrochemical Zhenhai oil refining chemical Co., Ltd.), 8 parts of POE modifier (LC 565 of Korean LG, the melt index is 5dg/min), 1 part of polyethylene wax (Sasobit of south Africa Sasol) and 1.0 part of interface enhancer (caruncle morning chemical Co., Ltd., CG-01741).
The POE composite modified asphalt has a zero shear viscosity of 35000Pa.s at 60 ℃ and a softening point of 94 ℃.
The results of the main performance tests on small particle size open graded asphalt mixes for ultra-thin overlay are shown in table 2. Wherein the test method of the communication void ratio refers to the appendix A of the technical specification of permeable asphalt pavement (CJJ/T190-2012), the test method of the dispersion loss of Kentabao refers to the test specification of road engineering asphalt and asphalt mixture (JTG E20-2011) T0733-2011, the test method of the dynamic stability refers to the test specification of road engineering asphalt and asphalt mixture (JTG E20-2011) T0719-2011, the test method of the freeze-thaw cleavage residual strength ratio refers to the test specification of road engineering asphalt and asphalt mixture (JTGE20-2011) T0729-2000, the test method of the water permeability coefficient refers to the test specification of road subgrade site (JTG E60-2008) T0971-2008, the test method of the structural depth refers to the test specification of road subgrade site (JTG 60-2008) T0961-1995-, the friction coefficient testing method refers to the field test regulation of road subgrade and pavement (JTG E60-2008) T0964-2008.
TABLE 2 Main Performance test results for Small particle size open-graded asphalt mixtures for ultra-thin overlay
| Serial number | Technical index | Unit of | Technical Properties |
| 1 | Interconnected porosity | % by volume | 12.0 |
| 2 | Kentucky scatter loss | % by weight | 8.5 |
| 3 | Degree of dynamic stability | Sub/mm | 3900 |
| 4 | Ratio of freeze-thaw split residual strength | ％ | 87 |
| 5 | Coefficient of water permeability | mL/min | 2500 |
| 6 | Depth of construction | mm | 0.92 |
| 7 | Coefficient of friction BPN20 | — | 72 |
The nominal maximum particle size of the small-particle-size open-graded asphalt mixture in this example was 4.75mm, and the pavement layer thickness was 1.2 cm.
Example 3
The small-particle size open-graded asphalt mixture for ultrathin overlay of this example comprises 92.0% by weight of aggregate, 2% by weight of filler and 6% by weight of POE compound modified asphalt. The aggregate is diabase produced by Huzhou Jinheng stone processing factory (formed by mixing 3 mm-5 mm continuous grading diabase and 0 mm-3 mm continuous grading diabase according to the mass ratio of 75: 25); the filler is a mixture of limestone mineral powder produced by Jiangxi Kuntai mineral powder factory and P.O 42.5.5 cement produced by Anhui sea snail cement GmbH, and the mass ratio is 2: 1.
The gradation of the aggregates used and of the fillers used is as follows:
| mesh size (mm) | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| Percent passage (%) | 100 | 99 | 15 | 5 | 5 | 3 | 3 | 2 |
The POE composite modified asphalt comprises the following components: 100 parts of No. 50 asphalt (China petrochemical and Zhenhai oil refining chemical industry Co., Ltd.), 14 parts of POE modifier (LC 170 of LG, the melt index is 1dg/min), 3 parts of polyethylene wax (Sasobit of Sasol of south Africa) and 0.3 part of interface enhancer (Jiangsu morning light coupling agent Co., Ltd., CG-202).
The POE composite modified asphalt has the zero shear viscosity of 42000Pa.s at the temperature of 60 ℃ and the softening point of 97 ℃.
The main performance test results for small particle size open graded asphalt mixes for ultra-thin finishes are shown in table 3. Wherein the test method of the communication void ratio refers to the appendix A of the technical specification of permeable asphalt pavement (CJJ/T190-2012), the test method of the dispersion loss of Kentabao refers to the test specification of road engineering asphalt and asphalt mixture (JTG E20-2011) T0733-2011, the test method of the dynamic stability refers to the test specification of road engineering asphalt and asphalt mixture (JTG E20-2011) T0719-2011, the test method of the freeze-thaw cleavage residual strength ratio refers to the test specification of road engineering asphalt and asphalt mixture (JTGE20-2011) T0729-2000, the test method of the water permeability coefficient refers to the test specification of road subgrade site (JTG E60-2008) T0971-2008, the test method of the structural depth refers to the test specification of road subgrade site (JTG 60-2008) T0961-1995-, the friction coefficient testing method refers to the field test regulation of road subgrade and pavement (JTG E60-2008) T0964-2008.
TABLE 3 Primary Performance test results for small particle size open graded asphalt mix for ultra-thin overlay
| Serial number | Technical index | Unit of | Technical Properties |
| 1 | Interconnected porosity | % by volume | 13.5 |
| 2 | Kentucky scatter loss | % by weight | 6.4 |
| 3 | Degree of dynamic stability | Sub/mm | 4700 |
| 4 | Ratio of freeze-thaw split residual strength | ％ | 89 |
| 5 | Coefficient of water permeability | mL/min | 2900 |
| 6 | Depth of construction | mm | 0.88 |
| 7 | Coefficient of friction BPN20 | — | 68 |
The nominal maximum particle size of the small-particle-size open-graded asphalt mixture of the present example was 4.75mm, and the thickness of the pavement layer was 1.5 cm.
Example 4
The small-particle-size open-graded asphalt mixture of the embodiment comprises 89.0% by weight of aggregate, 5.0% by weight of filler and 6.0% by weight of POE composite modified asphalt. The aggregate is diabase produced by Huzhou Jinheng stone processing factory (formed by mixing 3 mm-5 mm continuous grading diabase and 0 mm-3 mm continuous grading diabase according to the mass ratio of 80: 20); the filler is a mixture of limestone mineral powder produced by Jiangxi Kuntai mineral powder factory and P.O 42.5.5 cement produced by Anhui sea snail cement GmbH, and the mass ratio is 1: 1.
The gradation of the aggregates used and of the fillers used is as follows:
| mesh size (mm) | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| Percent passage (%) | 100 | 95 | 40 | 20 | 12 | 8 | 6 | 5 |
The POE composite modified asphalt comprises the following components: 100 parts of No. 30 asphalt (China petrochemical and Zhenhai oil refining chemical Co., Ltd.), 10 parts of POE modifier (LC 565 of Korean LG company, melt index 5dg/min), 1 part of polyethylene wax (Sasobit of south Africa company) and 0.3 part of interface enhancer (Jiangsu morning light coupling agent Co., Ltd., CG-302).
The POE composite modified asphalt has the zero shear viscosity of 40000Pa.s at 60 ℃ and the softening point of 94 ℃.
The main performance test results for small particle size open graded asphalt mixes for ultra-thin finishes are shown in table 4. Wherein the test method of the communication void ratio refers to the appendix A of the technical specification of permeable asphalt pavement (CJJ/T190-2012), the test method of the dispersion loss of Kentabao refers to the test specification of road engineering asphalt and asphalt mixture (JTG E20-2011) T0733-2011, the test method of the dynamic stability refers to the test specification of road engineering asphalt and asphalt mixture (JTG E20-2011) T0719-2011, the test method of the freeze-thaw cleavage residual strength ratio refers to the test specification of road engineering asphalt and asphalt mixture (JTGE20-2011) T0729-2000, the test method of the water permeability coefficient refers to the test specification of road subgrade site (JTG E60-2008) T0971-2008, the test method of the structural depth refers to the test specification of road subgrade site (JTG 60-2008) T0961-1995-, the friction coefficient testing method refers to the field test regulation of road subgrade and pavement (JTG E60-2008) T0964-2008.
TABLE 4 Main Performance test results for Small particle size open-graded asphalt mixtures for ultra-thin overlay
The nominal maximum particle size of the small-particle-size open-graded asphalt mixture in this example was 4.75mm, and the pavement layer thickness was 1.3 cm.
Therefore, the invention has the following positive progress effects:
1. a main aggregate filling method is designed by adopting asphalt mixture composition to construct a novel small-particle-size open-graded asphalt mixture for ultrathin overlay, so that the embedding and extruding capacity of the coarse aggregate serving as the main aggregate is fully exerted, and the stability of framework embedding and locking is improved; through the construction of gradation, the asphalt mixture has good anti-skid performance and larger construction depth despite smaller nominal maximum particle size, and the driving safety of the road surface is improved.
2. By adopting the POE modifier with the weight of 8-14%, the softening point and the zero shear viscosity at 60 ℃ of the asphalt are greatly improved; by adding a certain proportion of silane coupling agent into polymer modified asphalt, organic groups of the silane coupling agent and organic groups in the asphalt are crosslinked, so that the adhesion between the asphalt and aggregate is enhanced, the infiltration capacity and the structural asphalt film thickness of the asphalt are improved, the interface strength of the asphalt and the aggregate is improved, and the developed small-particle-size open-graded asphalt mixture for ultrathin overlay coating has good anti-scattering loss capacity; by adding polyethylene wax in a certain proportion into the polymer modified asphalt, the small-particle-size open-graded asphalt mixture for the ultrathin cover surface is endowed with good construction workability and compactibility.
3. The small-particle-size open-graded asphalt mixture for the ultrathin overlay has larger interconnected porosity (not less than 12% of volume) and higher water permeability coefficient (not less than 2000mL/min), reduces the danger of high-speed water drift, and can still maintain good contact between the tire and the road surface under the condition that water exists on the road surface. The splashing and the water mist generated by the rainwater can be greatly reduced, and the visibility is good.
4. The nominal maximum grain diameter of the small-grain-diameter open-graded asphalt mixture for the ultrathin overlay is 4.75mm, the thickness of a pavement layer is 1.0 cm-1.5 cm, the thickness of the overlay is effectively reduced, and the construction cost of preventive maintenance is reduced.
Therefore, the small-particle-size open-graded asphalt mixture for the ultrathin overlay surface has the characteristics of high scattering loss resistance, larger communication porosity, high construction depth, pavement drainage function and the like by improving the framework interlocking stability in the grading design stage and improving the infiltration capacity and the structural asphalt film thickness of the asphalt by adopting the POE composite modified asphalt.
In conclusion, the small-particle-size graded asphalt mixture for the ultrathin overlay can reduce the overlay thickness, the engineering cost and the driving noise, can fully utilize two grades of hard stones of 3-5 mm and 0-3 mm, reduces the excessive environment and resource pressure of corresponding stones caused by large-scale application of SMA pavements, is ingenious in design, simple and convenient to prepare, low in cost and suitable for large-scale popularization and application.
In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention. The description is thus to be regarded as illustrative instead of limiting.
Claims (8)
1. The small-particle-size open-graded asphalt mixture for the ultrathin overlay is characterized by comprising 85-92 wt% of aggregate, 2-8 wt% of filler and 5.5-7.5 wt% of polymer modified asphalt, wherein the nominal maximum particle size of the small-particle-size open-graded asphalt mixture for the ultrathin overlay is 4.75mm, and the paving layer thickness of the small-particle-size open-graded asphalt mixture for the ultrathin overlay is 1.0-1.3 cm;
the aggregates comprise 3-5 mm continuous graded first aggregates and 0-3 mm continuous graded second aggregates, and the mass ratio of the first aggregates to the second aggregates is 75-80: 20-25;
the polymer modified asphalt is POE composite modified asphalt, the zero shear viscosity of the POE composite modified asphalt at 60 ℃ is more than or equal to 30000Pa.s, and the softening point of the POE composite modified asphalt is more than or equal to 90 ℃;
the POE composite modified asphalt comprises hard asphalt, a modifier, a warm mixing agent and an interface reinforcing agent, wherein the modifier is polyolefin elastomer POE, the modifier accounts for 8-14 wt% of the hard asphalt, and the warm mixing agent accounts for 1-3 wt% of the hard asphalt; the interface reinforcing agent accounts for 0.3-1.0 wt% of the hard asphalt;
the communicating porosity of the small-particle size open-graded asphalt mixture for the ultrathin overlay is more than or equal to 12 percent by volume.
2. The small particle size open-graded asphalt mix for ultra-thin overlays according to claim 1 wherein said aggregate is basalt or diabase.
3. The small-particle-size open-graded asphalt mixture for ultrathin overlay surfaces as claimed in claim 1, wherein the filler is a mixture of limestone mineral powder and cement, and the mass ratio of the limestone mineral powder to the cement is 1: 1-3: 1.
4. A small particle size open-graded asphalt mix for ultra-thin overlay as claimed in claim 1 wherein the aggregate and filler are graded in a range satisfying the following requirements:
。
5. The small particle size open graded asphalt mixture for ultra-thin overlay as claimed in claim 1, wherein the penetration of the hard asphalt is 20-60, unit is 0.1 mm.
6. The small particle size open-graded asphalt mix for ultra-thin finishes as claimed in claim 1, characterized in that the hard asphalt is No. 30 asphalt or No. 50 asphalt; the warm mixing agent is polyethylene wax; the interface reinforcing agent is a silane coupling agent.
7. The small particle size open-graded asphalt mix for ultra-thin finishes of claim 1 wherein the modifier has a melt index of 1dg/min to 10 dg/min.
8. The small-particle-size graded asphalt mixture for ultrathin finishing as claimed in claim 1, wherein the Kentucky scattering loss of the small-particle-size graded asphalt mixture for ultrathin finishing is less than or equal to 10% by weight, the dynamic stability of the small-particle-size graded asphalt mixture for ultrathin finishing is more than or equal to 3500 times/mm, the split freeze-thaw residual strength ratio of the small-particle-size graded asphalt mixture for ultrathin finishing is more than or equal to 85%, and the friction coefficient BPN of the small-particle-size graded asphalt mixture for ultrathin finishing is greater than or equal to 85%20The water seepage coefficient of the small-particle-size open-graded asphalt mixture for the ultrathin cover surface is more than or equal to 2000 mL/min.
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| CN108046661A (en) * | 2017-11-27 | 2018-05-18 | 上海市政工程设计研究总院（集团）有限公司 | A kind of ultra-thin pervious asphalt abrasion layer material of high-strength durable |
| CN107892510A (en) * | 2017-11-28 | 2018-04-10 | 广州大学 | A kind of thin overlay asphalt |
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| CN110590235A (en) * | 2019-10-16 | 2019-12-20 | 上海同沥新材料科技有限公司 | Ultrathin asphalt mixture and preparation method thereof |
| CN110714389A (en) * | 2019-11-11 | 2020-01-21 | 上海市市政规划设计研究院有限公司 | Ultrathin high-performance composite semi-flexible surface layer pavement structure and construction method thereof |
| CN110903059A (en) * | 2019-12-06 | 2020-03-24 | 长安大学 | Super-viscous wear-resistant composite modified emulsified asphalt thin layer cover material and preparation method thereof |
| CN112279558A (en) * | 2020-11-17 | 2021-01-29 | 湖南省交通科学研究院有限公司 | Small-particle-size dense-grade ultra-thin wearing layer and preparation method thereof |
| CN112661441A (en) * | 2020-11-23 | 2021-04-16 | 浙江顺畅高等级公路养护有限公司 | Asphalt concrete, preparation method and small-particle-size extremely-thin cover |
| CN114163811A (en) * | 2022-01-07 | 2022-03-11 | 安徽露德新材料科技有限公司 | Multifunctional thin-layer modifier for high-ductility ultrathin overlay asphalt mixture |
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