CN113292274A - High-ductility-elasticity ultrathin overlay asphalt mixture, paving method and paved high-ductility-elasticity ultrathin overlay - Google Patents
High-ductility-elasticity ultrathin overlay asphalt mixture, paving method and paved high-ductility-elasticity ultrathin overlay Download PDFInfo
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- CN113292274A CN113292274A CN202110596997.1A CN202110596997A CN113292274A CN 113292274 A CN113292274 A CN 113292274A CN 202110596997 A CN202110596997 A CN 202110596997A CN 113292274 A CN113292274 A CN 113292274A
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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
- E01C11/00—Details of pavings
- E01C11/005—Methods or materials for repairing pavings
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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
- E01C11/00—Details of pavings
- E01C11/24—Methods or arrangements for preventing slipperiness or protecting against influences of the weather
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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
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/48—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ
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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
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/48—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ
- E01C19/4806—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ with solely rollers for consolidating or finishing
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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
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/48—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ
- E01C19/4806—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ with solely rollers for consolidating or finishing
- E01C19/4826—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ with solely rollers for consolidating or finishing the materials being aggregate mixed with binders
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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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- 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
- C04B2201/10—Mortars, concrete or artificial stone characterised by specific physical values for the viscosity
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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
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- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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Abstract
The invention discloses a high-ductility ultrathin overlay asphalt mixture which comprises the following raw materials in parts by weight: 100 parts of asphalt, 25-30 parts of modified emulsified asphalt, 58-65 parts of coarse and fine aggregates, 4-10 parts of filler, 15-20 parts of polydimethylsiloxane and 30-40 parts of nano-clay, wherein the modified emulsified asphalt is prepared from asphalt, a styrene-butadiene-styrene block copolymer, an emulsifier and a modifier, so that the problems of poor viscosity, poor toughness under low-temperature conditions, low elasticity and high noise of the traditional asphalt are solved, and the waterproof performance, the crack resistance and the low-temperature toughness of the micro-surface of the asphalt can be obviously enhanced.
Description
Technical Field
The invention relates to a high-ductility-elasticity ultrathin overlay asphalt mixture, a paving method and a paved high-ductility-elasticity ultrathin overlay, belonging to the technical field of pavement construction.
Background
The super-viscous road asphalt mixture is a preventive maintenance technology which adopts special mechanical equipment to mix polymer modified emulsified asphalt, coarse and fine aggregates, fillers, water, additives and the like according to a designed mixing proportion to form a super-viscous super-thin wearing layer mixture, spreads the super-viscous super-thin wearing layer mixture on the original road surface, and quickly recovers traffic and has high skid resistance and durability. The time length of the traffic closed by the ultra-thin wearing layer is changed according to different environments of the engineering, and the traffic can be opened within 1h usually.
The high-ductility ultra-thin overlay technology is an anti-skid, drainage, mute and durable ultra-thin overlay technology which is formed by quickly paving a combination of a high-efficiency compound ultra-sticky asphalt mixture surface wearing layer and an ultra-sticky self-healing non-sticky wheel non-emulsified sticky layer without milling the original pavement, and the thickness of the ultra-thin overlay technology is generally 0.7-1.5 cm. The coating is suitable for functional finish coats of bridge floors, tunnel pavements, cement pavements, asphalt pavements and the like. The method is particularly suitable for additional paving of elevated bridge floors and tunnel pavements, and is suitable for white and black pavement of cement pavements and rut treatment of asphalt pavements below 1.5 cm. The traditional asphalt mixture is poor in viscosity, poor in toughness under low-temperature conditions, small in elasticity and high in noise, and cannot be used on a high-ductility ultra-thin mat coat, so that the asphalt mixture suitable for the high-ductility ultra-thin mat coat technology and the paving method thereof are urgently needed to be solved.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a high-ductility-elasticity ultrathin overlay asphalt mixture, a paving method thereof and a paved high-ductility-elasticity ultrathin overlay.
The high-ductility and high-elasticity ultrathin overlay asphalt mixture is formed by paving after mixing a high-ductility and high-elasticity ultrathin overlay asphalt mixture according to a certain component formula, wherein the high-ductility and high-elasticity ultrathin overlay asphalt mixture comprises asphalt, modified emulsified asphalt, coarse and fine aggregates, a filler, polydimethylsiloxane oil and nano clay.
The invention discloses a high-ductility ultrathin overlay asphalt mixture, which comprises the following raw materials in parts by weight: 100 parts of asphalt, 25-30 parts of modified emulsified asphalt, 58-65 parts of coarse and fine aggregates, 4-10 parts of filler, 15-20 parts of polydimethylsiloxane oil and 30-40 parts of nano-clay.
The modified emulsified asphalt is prepared from asphalt, a styrene-butadiene-styrene block copolymer, an emulsifier and a modifier, and the slow-breaking and quick-setting type cationic asphalt emulsion is obtained by an emulsification process. Wherein the ratio of the asphalt, the styrene-butadiene-styrene block copolymer and the modifier in the modified emulsified asphalt is 10: 3-5: 1-3 in parts by weight.
Preferably, the ratio of the asphalt, the styrene-butadiene-styrene block copolymer and the modifier in the modified emulsified asphalt is 10: 4: 2.
Wherein, the modifier is preferably prepared by water-based epoxy resin and polyurethane according to the proportion of 1:1.5-2.5, the emulsifier is a cation slow-breaking and quick-setting emulsifier, and the mixing amount of the emulsifier is 1% -2%.
The crushing value and the abrasion resistance value of the aggregate have great influence on ensuring the anti-skid performance of the pavement. Basic aggregates such as limestone have a low crush value and are easily crushed, and acidic aggregates such as granite, although hard in texture and strong in abrasion resistance, have a weak adhesion to asphalt and easily cause loosening and peeling of pavement. The coarse and fine aggregates are basalt coarse aggregates with the thickness of 4.75-7.5mm and basalt fine aggregates with the thickness of 0-4.75 mm, the ratio of the coarse and fine aggregates is 3: 2, the coarse and fine aggregates have good adhesion with asphalt, and all performances meet the requirements (see table 3).
The thickness of the ultrathin cover surface is only 15-20 mm, the ultrathin cover surface is in a graded broken state, the nominal maximum grain size is generally controlled within 13mm, and the 0-10 mm type graded or 0-6 mm type graded ultra-thin cover surface is generally adopted abroad. As China has no mixture gradation with the nominal maximum grain size of 6mm, the 0-10 mm type gradation is mainly used. When the grade-breaking ratio is adopted, the construction depth is good, the initial anti-skid performance is good, but the porosity level of the mixture is unstable, and the pavement compactness is influenced. Through research, under the condition of grading gradation, the compaction frequency is 75 times per surface, the porosity of a test piece is less than 4%, and a compact structure cannot be formed. The reason for this problem is that the content of coarse aggregate with a particle size of more than 4.75mm in the graded composition is not easy to control, resulting in the difficulty in controlling the graded composition. Aiming at the problem, the grading control is enhanced, 4.75mm sieve holes are added according to the condition that the coarse material proportion has large influence on the grading, and the mixing proportion test is carried out according to 0-4.75 mm and 4.75-7.5mm, so that the optimal grading is determined.
The mineral filler mainly comprises cement, lime and the like, and can fill gaps among aggregates to achieve better gradation. The mineral filler can also improve the molding state of the modified emulsified asphalt, slow down the aging of the asphalt and improve the stability of the asphalt.
The polydimethylsiloxane oil can increase the elasticity and the track resistance of the asphalt in a high-temperature environment.
The nano clay can improve the anti-aging and high-temperature capabilities of the asphalt, and the asphalt can age and harden under the action of external conditions such as illumination, high temperature, water immersion and the like, so that the service performance of the pavement is seriously influenced. The addition of the nano clay can improve the hardness, high-temperature and low-temperature stability and ageing resistance of the asphalt and improve the self-healing capability of the asphalt.
Furthermore, the invention also comprises an ultrathin overlay formed by paving the high-ductility and elastic ultrathin overlay asphalt mixture, the thickness of the ultrathin overlay is 1.2-1.5cm, and the service life of the ultrathin overlay is as long as 8-10 years.
Further, the invention also comprises a paving method for paving the high-ductility and elastic ultrathin overlay asphalt mixture into an ultrathin overlay, which specifically comprises the following steps:
the operation of the unloading device 2 is enabled to run on the road surface, the high-pressure oil sprayer on the unloading device 2 sprays the viscous layer oil on the road surface, wherein the hanging mechanism 3 hangs the adjusting mechanism 4 on the unloading device 2, the adjusting mechanism 4 and the compacting device 7 also move along with the movement, then the unloading device 2 unloads the asphalt mixture on one side, the fallen paving material is leveled under the action of the leveling piece 5, then the compacting device 7 compacts and flattens the paving material along with the paving material, so that the paving work can be completed, wherein when the paving thickness is adjusted, a user unscrews the locking nut 8, then the motor 43 is started to drive the guide roller 44 to rotate, under the action of the spiral groove 45, the guide roller 44 drives the sliding pin 47 to move upwards, then the moving rack 46 can move along with the movement, the moving rack 46 can also drive the leveling piece 5 to move upwards, and when the leveling piece 5 is adjusted to a proper height, then the height of the paving material leveled by the leveling piece 5 is a required thickness, therefore, the adjustment of the paving thickness can be completed, the actual use requirement is met, the paving sequence is that the bonding layer 10 is paved on the original pavement 9, the surface wearing layer 11 is paved on the bonding layer 10, and the surface wearing layer is formed after the high-ductility and elasticity ultrathin overlay asphalt mixture is cooled.
The method for paving the road surface by the high-ductility ultra-thin overlay asphalt mixture comprises an overlay pavement structure 1 and a discharging device 2 running on the road surface, wherein the left side of the discharging device 2 is connected with an adjusting mechanism 4 in a hanging way through a hanging mechanism 3, a leveling piece 5 is arranged in the inner cavity of the adjusting mechanism 4, a damping mechanism 6 is movably arranged on the left side of the inner cavity of the adjusting mechanism 4, a compacting device 7 is fixedly arranged on the left side of the damping mechanism 6, locking nuts 8 positioned on the outer side of the adjusting mechanism 4 are in threaded connection with the front side and the rear side of the leveling piece 5, the adjusting mechanism 4 comprises a shell 41, a base 42 is fixedly connected with the bottom of the inner cavity of the shell 41, a motor 43 is fixedly arranged on the right side of the top of the shell 41, an output shaft of the motor 43 penetrates through the inner cavity of the shell 41 and is fixedly provided with a guide roller 44, a spiral groove 45 is formed in the surface of the guide roller 44, and a moving frame 46 is sleeved on the surface of the guide roller 44, one side of the inner cavity of the movable frame 46 is fixedly connected with a sliding pin 47, one end of the sliding pin 47 slides in the inner cavity of the spiral groove 45, one side of the movable frame 46 is fixedly connected to the leveling part 5, the damping mechanism 6 comprises a mounting shaft 63 fixedly connected to the inner wall of the shell 41 and a bottom plate 61, a swing arm 62 is movably mounted on the surface of the mounting shaft 63, one side of the swing arm 62 is fixedly mounted on the compacting equipment 7 through bolts, the bottom of the swing arm 62 is fixedly connected with a damping spring 64, the bottom end of the damping spring 64 is fixedly connected to the bottom plate 61, the hitching mechanism 3 comprises a fixed shaft lever 31 fixedly connected to the shell 41 and a hitching pin 34 fixedly connected to the unloading equipment 2, a hitching sleeve 33 is hitched on the surface of the hitching pin 34, a hitching arm 32 is fixedly connected to one side of the hitching sleeve 33, one end of the hitching arm 32 is rotatably connected to the fixed shaft lever 31, long sliding holes are formed in the front side and the rear side of the shell 41, the front side end and the rear side end of the leveling piece 5 respectively slide in the two long sliding holes, the cross section of the bottom end of the leveling piece 5 is a tip, the tip of the leveling piece 5 faces the unloading device 2, the right side of the bottom of the shell 41 is an upward inclined plane, the bottoms of two sides of the inner cavity of the hanging sleeve 33 are provided with inclined planes, and the overlay pavement structure 1 is formed by combining a surface wearing layer 11 and a bonding layer 10; the bottom of overlay pavement structure 1 is provided with road surface 9, surface wearing and tearing layer 11 is laid on the surface of road surface 9 through tie coat 10, wherein the internally mounted of equipment of unloading 2 has the oil storage tank, and two high-pressure oil sprayers are still installed to 2 afterbody bottoms of equipment of unloading, store the viscous layer oil in the oil storage tank, link to each other with high-pressure oil sprayer through the pipeline, establish self-control spray lance and nozzle behind the high-pressure oil sprayer for evenly spray the road surface with the viscous layer oil. The surface wearing layer comprises the following raw materials in parts by weight: 100 parts of asphalt, 25-30 parts of modified emulsified asphalt, 58-65 parts of coarse and fine aggregates, 4-10 parts of filler, 15-20 parts of polydimethylsiloxane oil and 30-40 parts of nano-clay.
The invention has the beneficial effects that:
1. the pavement paving method is attractive and attractive, high in speed and efficiency, free of elevation increase, free of milling and planing the original pavement, high in construction efficiency, short in construction period, small in traffic influence, uniform in pavement, attractive in color and luster, targeted therapy, economic leveling, targeted patching of structural damage points, local high-modulus rut patching of ruts exceeding 1.5cm, adjustment of transverse and longitudinal slopes through fine milling and napping after patching, paving of the ultrathin wearing layer, disease repairing, and low in cost, and road running comfort is rapidly solved.
2. The epoxy resin is a liquid phase system material which takes epoxy resin particles as a disperse phase and water as a continuous phase, can be cured at room temperature and in a humid environment, can well keep the characteristics of high strength and strong cohesive force of the epoxy resin, and can effectively make up the technical defects of the traditional modified emulsified asphalt when used as a micro-surface cementing material. The epoxy resin and polyurethane are compounded to be used as a modifier, so that the waterproof performance, the crack resistance and the low-temperature toughness of the asphalt micro-surface can be obviously enhanced.
3. The molding state of the modified emulsified asphalt is improved, the aging of the asphalt is slowed down, and the stability of the asphalt is improved. Increasing the elasticity and the rutting resistance of the asphalt in a high-temperature environment.
4. The viscosity, hardness, high-temperature and low-temperature stability and ageing resistance of the asphalt are improved, and the self-healing capacity of the asphalt is improved.
Drawings
FIG. 1 is a schematic structural diagram of the embodiment.
FIG. 2 is a front view of an embodiment adjustment mechanism.
FIG. 3 is a front sectional view of an embodiment adjustment mechanism.
FIG. 4 is a partial perspective view of an embodiment adjustment mechanism.
FIG. 5 is a perspective view of the hitch mechanism of the embodiment.
FIG. 6 is a schematic diagram of an example material structure layer.
FIG. 7 is a graph showing the results of an asphalt ductility tensile test.
Fig. 8 is a comparison graph of vehicle interior noise.
Description of reference numerals: 1. a cover pavement structure; 2. a discharge device; 3. a hanging mechanism; 4. an adjustment mechanism; 5. a leveling member; 6. a damping mechanism; 7. compacting equipment; 8. locking the nut; 41. a housing; 42. a base; 43. a motor; 44. a guide roller; 45. a helical groove; 46. a movable frame; 47. a slide pin; 61. a base plate; 62. a swing arm; 63. installing a shaft; 64. a damping spring; 31. fixing the shaft lever; 32. a hanging arm; 33. hanging a connecting sleeve; 34. a hitch pin; 9. a pavement; 10. a bonding layer; 11. a surface wear layer.
Detailed Description
Example 1: the high-ductility ultrathin overlay asphalt mixture comprises the following raw materials in parts by weight: 100 parts of asphalt, 25 parts of modified emulsified asphalt, 58 parts of coarse and fine aggregates, 4 parts of filler, 15 parts of polydimethylsiloxane oil and 30 parts of nano-clay. The modified emulsified asphalt is prepared from asphalt, a styrene-butadiene-styrene block copolymer, an emulsifier and a modifier, and the slow-breaking and quick-setting type cationic asphalt emulsion is obtained by an emulsification process. Wherein the ratio of the asphalt, the styrene-butadiene-styrene block copolymer, the emulsifier and the modifier in the modified emulsified asphalt is 10: 3: 1 in parts by weight. Wherein, the modifier is waterborne epoxy resin and polyurethane 1: 2, the emulsifier is cation slow-breaking quick-setting emulsifier, and the mixing amount of the emulsifier is 1%. The coarse and fine aggregates are basalt coarse aggregates with the thickness of 4.75-7.5mm and basalt fine aggregates with the thickness of 0-4.75 mm, the proportion of the coarse and fine aggregates is 3: 2, and the filler is cement.
Example 2: the high-ductility ultrathin overlay asphalt mixture comprises the following raw materials in parts by weight: 100 parts of asphalt, 30 parts of modified emulsified asphalt, 65 parts of coarse and fine aggregates, 10 parts of filler, 20 parts of polydimethylsiloxane oil and 40 parts of nano-clay. The modified emulsified asphalt is prepared from asphalt, a styrene-butadiene-styrene block copolymer, an emulsifier and a modifier, and the slow-breaking and quick-setting type cationic asphalt emulsion is obtained by an emulsification process. Wherein the ratio of the asphalt, the styrene-butadiene-styrene block copolymer, the emulsifier and the modifier in the modified emulsified asphalt is 10: 5: 3 in parts by weight. Wherein, the modifier is waterborne epoxy resin and polyurethane 1: 2, the emulsifier is cation slow-breaking quick-setting emulsifier, and the mixing amount of the emulsifier is 1%. The coarse and fine aggregates are basalt coarse aggregates with the thickness of 4.75-7.5mm and basalt fine aggregates with the thickness of 0-4.75 mm, the proportion of the coarse and fine aggregates is 3: 2, and the filler is cement.
Example 3: the high-ductility ultrathin overlay asphalt mixture comprises the following raw materials in parts by weight: 100 parts of asphalt, 27 parts of modified emulsified asphalt, 62 parts of coarse and fine aggregates, 7 parts of filler, 17 parts of polydimethylsiloxane oil and 35 parts of nano clay. The modified emulsified asphalt is prepared from asphalt, a styrene-butadiene-styrene block copolymer, an emulsifier and a modifier, and the slow-breaking and quick-setting type cationic asphalt emulsion is obtained by an emulsification process. Wherein the ratio of the asphalt, the styrene-butadiene-styrene block copolymer, the emulsifier and the modifier in the modified emulsified asphalt is 10: 4: 2 in parts by weight. Wherein, the modifier is waterborne epoxy resin and polyurethane 1: 2, the emulsifier is cation slow-breaking quick-setting emulsifier, and the mixing amount of the emulsifier is 1%. The coarse and fine aggregates are basalt coarse aggregates with the thickness of 4.75-7.5mm and basalt fine aggregates with the thickness of 0-4.75 mm, the proportion of the coarse and fine aggregates is 3: 2, and the filler is cement.
Example 4: the high-ductility ultrathin overlay asphalt mixture comprises the following raw materials in parts by weight: 100 parts of asphalt, 25 parts of modified emulsified asphalt, 58 parts of coarse and fine aggregates, 4 parts of filler, 15 parts of polydimethylsiloxane oil and 30 parts of nano-clay. The modified emulsified asphalt is prepared from asphalt, a styrene-butadiene-styrene block copolymer, an emulsifier and a modifier, and the slow-breaking and quick-setting type cationic asphalt emulsion is obtained by an emulsification process. Wherein the ratio of the asphalt, the styrene-butadiene-styrene block copolymer, the emulsifier and the modifier in the modified emulsified asphalt is 10: 3: 1 in parts by weight. Wherein, the modifier is aqueous epoxy resin and polyurethane with the ratio of 1:1.5, the emulsifier is cation slow-breaking quick-setting emulsifier, and the mixing amount of the emulsifier is 1.5 percent. The coarse and fine aggregates are basalt coarse aggregates with the thickness of 4.75-7.5mm and basalt fine aggregates with the thickness of 0-4.75 mm, the proportion of the coarse and fine aggregates is 3: 2, and the filler is cement.
Example 5: the high-ductility ultrathin overlay asphalt mixture comprises the following raw materials in parts by weight: 100 parts of asphalt, 25 parts of modified emulsified asphalt, 58 parts of coarse and fine aggregates, 4 parts of filler, 15 parts of polydimethylsiloxane oil and 30 parts of nano-clay. The modified emulsified asphalt is prepared from asphalt, a styrene-butadiene-styrene block copolymer, an emulsifier and a modifier, and the slow-breaking and quick-setting type cationic asphalt emulsion is obtained by an emulsification process. Wherein the ratio of the asphalt, the styrene-butadiene-styrene block copolymer, the emulsifier and the modifier in the modified emulsified asphalt is 10: 3: 1 in parts by weight. Wherein, the modifier is water-based epoxy resin and polyurethane 1: 2, the emulsifier is a cation slow-breaking and quick-setting emulsifier, and the mixing amount of the emulsifier is 1.5 percent. The coarse and fine aggregates are basalt coarse aggregates with the thickness of 4.75-7.5mm and basalt fine aggregates with the thickness of 0-4.75 mm, the proportion of the coarse and fine aggregates is 3: 2, and the filler is cement.
Example 6: the high-ductility ultrathin overlay asphalt mixture comprises the following raw materials in parts by weight: 100 parts of asphalt, 25 parts of modified emulsified asphalt, 58 parts of coarse and fine aggregates, 4 parts of filler, 15 parts of polydimethylsiloxane oil and 30 parts of nano-clay. The modified emulsified asphalt is prepared from asphalt, a styrene-butadiene-styrene block copolymer, an emulsifier and a modifier, and the slow-breaking and quick-setting type cationic asphalt emulsion is obtained by an emulsification process. Wherein the ratio of the asphalt, the styrene-butadiene-styrene block copolymer, the emulsifier and the modifier in the modified emulsified asphalt is 10: 3: 1 in parts by weight. Wherein, the modifier is aqueous epoxy resin and polyurethane with the ratio of 1:1.5, the emulsifier is cation slow-breaking quick-setting emulsifier, and the mixing amount of the emulsifier is 2 percent. The coarse and fine aggregates are basalt coarse aggregates with the thickness of 4.75-7.5mm and basalt fine aggregates with the thickness of 0-4.75 mm, the proportion of the coarse and fine aggregates is 3: 2, and the filler is cement.
Example 7: the high-ductility ultrathin overlay asphalt mixture comprises the following raw materials in parts by weight: 100 parts of asphalt, 25 parts of modified emulsified asphalt, 58 parts of coarse and fine aggregates, 4 parts of filler, 15 parts of polydimethylsiloxane oil and 30 parts of nano-clay. The modified emulsified asphalt is prepared from asphalt, a styrene-butadiene-styrene block copolymer, an emulsifier and a modifier, and the slow-breaking and quick-setting type cationic asphalt emulsion is obtained by an emulsification process. Wherein the ratio of the asphalt, the styrene-butadiene-styrene block copolymer, the emulsifier and the modifier in the modified emulsified asphalt is 10: 3: 1 in parts by weight. Wherein, the modifier is waterborne epoxy resin and polyurethane 1: 2, the emulsifier is cation slow-breaking quick-setting emulsifier, and the mixing amount of the emulsifier is 2%. The coarse and fine aggregates are basalt coarse aggregates with the thickness of 4.75-7.5mm and basalt fine aggregates with the thickness of 0-4.75 mm, the proportion of the coarse and fine aggregates is 3: 2, and the filler is cement.
Comparative example 1: other raw materials were the same as in example 1, and the modifier was only a water-based epoxy resin.
Comparative example 2: other raw materials were the same as in example 1, and the modifier was only polyurethane.
Comparative example 3: the other raw materials were the same as in example 1, except that the polydimethylsiloxane oil was omitted.
Comparative example 4: the other raw materials are the same as example 1, the nano argil is changed into the common argil
Blank example 1: the other raw materials were the same as in example 1, except that the polydimethylsiloxane oil and the modifier were omitted.
Blank example 2: the other raw materials were the same as in example 1, and the modifier was omitted.
Blank example 3: the other raw materials were the same as in example 1 except that the nanoclay was omitted.
TABLE 1 high-ductility ultra-thin overlay asphalt mixture performance test
As can be seen from Table 1, the waterborne epoxy resin provided by the invention can effectively improve the high-temperature performance and ductility of asphalt evaporation residues by matching polyurethane as a modifier, and the viscosity of the modified asphalt is improved.
TABLE 2 Water stability and Low temperature (-10 ℃ C.) bending test results for asphalt mixtures
The asphalt mixture was subjected to the water immersion marshall test and the freeze-thaw cleavage test to evaluate the water stability, and the results are shown in table 2, and the asphalt mixture had good water damage resistance after the modifier was added. The low-temperature bending test result shows that the modified asphalt has good low-temperature toughness and crack resistance.
TABLE 3 aggregate Performance index test results
The aggregate is an important component of the asphalt mixture and plays a role of a structural framework for the asphalt composition, the coarse and fine aggregates are all selected from basalt, the proportion of the coarse and fine aggregates is optimized, the adhesion between the asphalt and the aggregate can be enhanced, and all indexes meet the technical requirements of the specification.
TABLE 4 anti-rutting ability at micro-surfacing of different components
As can be seen from the rutting deformation test in table 3, the main indicators are the width deformation rate and the rutting depth rate, and the larger the width deformation rate and the rutting depth rate is, the worse the rutting resistance is. It can be seen from table 3 that the polymethylsilicone oil and the modifier significantly enhance the rutting resistance of the asphalt composition.
The asphalt mixture is subjected to ductility tensile test, a ductility extensometer is used for testing, and the influence of self-healing on the low-temperature crack resistance of asphalt is reflected by the difference of the tensile distance before and after the sample is damaged and healed. The asphalt of the examples and the asphalt of the comparative examples are respectively prepared into ductility samples and self-healing samples, the ductility samples are prepared according to the test procedure of road engineering asphalt and asphalt mixture (JTGE20-2011), the self-healing samples cut off the ductility samples to produce damages, and then the ductility samples are spliced and extruded for a period of time completely and placed in a healing environment to complete healing. Respectively carrying out tensile test by using a ductility instrument, recording tensile data, wherein the test temperature is 10 ℃, the tensile speed is 5cm/min, the healing temperature is 30 ℃, and the healing time is 3 h. The self-healing performance was evaluated according to the ratio of the stretched length of the asphalt after healing to the stretched length before healing. It can be seen from the results of the ductility tensile test of the asphalt in fig. 7 that the nano clay enhances the low-temperature stability and the self-healing ability of the asphalt.
As can be seen from the attached figure 8 in the specification, the driving noise of the vehicle can be reduced by 4-8dB after the overlay surface is paved, meanwhile, the dust on the original road surface can be absorbed, the original road surface does not need to be milled, and the construction adaptability is good.
Claims (7)
1. The asphalt mixture for paving the high-ductility ultrathin overlay is characterized by comprising the following raw materials in parts by weight: 100 parts of asphalt, 25-30 parts of modified emulsified asphalt, 58-65 parts of coarse and fine aggregates, 4-10 parts of filler, 15-20 parts of polydimethylsiloxane oil and 30-40 parts of nano-clay.
2. The asphalt mixture according to claim 1, wherein the modified emulsified asphalt is prepared from asphalt, styrene-butadiene-styrene block copolymer, emulsifier and modifier, and the slow-breaking and quick-setting type cationic asphalt emulsion is obtained by an emulsification process, wherein the ratio of the asphalt, the styrene-butadiene-styrene block copolymer, the emulsifier and the modifier in the modified emulsified asphalt is 10: 3-5: 1-3: 1-3.
3. The asphalt mixture according to claim 2, wherein the ratio of the asphalt, the styrene-butadiene-styrene block copolymer, the emulsifier and the modifier in the modified emulsified asphalt is 10: 4: 2: 2.
4. the asphalt mixture according to claim 2, wherein the modifier is preferably a water-based epoxy resin and polyurethane prepared in a ratio of 1:1.5-2.5, the emulsifier is a cationic slow-breaking and quick-setting emulsifier, and the mixing amount of the emulsifier is 1% -2%.
5. A paving method of a high-ductility elastic ultrathin cover surface is characterized by comprising a cover surface pavement road surface structure 1 and a discharging device 2 running on the road surface, wherein the left side of the discharging device 2 is hung with an adjusting mechanism 4 through a hanging mechanism 3, the inner cavity of the adjusting mechanism 4 is provided with a leveling piece 5, the left side of the inner cavity of the adjusting mechanism 4 is movably provided with a damping mechanism 6, the left side of the damping mechanism 6 is fixedly provided with a compacting device 7, the front side and the rear side of the leveling piece 5 are both in threaded connection with a locking nut 8 positioned on the outer side of the adjusting mechanism 4, the adjusting mechanism 4 comprises a shell 41, the bottom of the inner cavity of the shell 41 is fixedly connected with a base 42, the right side of the top of the shell 41 is fixedly provided with a motor 43, the output shaft of the motor 43 penetrates through the inner cavity of the shell 41 and is fixedly provided with a guide roller 44, the surface of the guide roller 44 is provided with a spiral groove 45, and the surface of the guide roller 44 is sleeved with a moving frame 46, one side of the inner cavity of the movable frame 46 is fixedly connected with a sliding pin 47, one end of the sliding pin 47 slides in the inner cavity of the spiral groove 45, one side of the movable frame 46 is fixedly connected to the leveling part 5, the damping mechanism 6 comprises a mounting shaft 63 fixedly connected to the inner wall of the shell 41 and a bottom plate 61, a swing arm 62 is movably mounted on the surface of the mounting shaft 63, one side of the swing arm 62 is fixedly mounted on the compacting equipment 7 through bolts, the bottom of the swing arm 62 is fixedly connected with a damping spring 64, the bottom end of the damping spring 64 is fixedly connected to the bottom plate 61, the hitching mechanism 3 comprises a fixed shaft lever 31 fixedly connected to the shell 41 and a hitching pin 34 fixedly connected to the unloading equipment 2, a hitching sleeve 33 is hitched on the surface of the hitching pin 34, a hitching arm 32 is fixedly connected to one side of the hitching sleeve 33, one end of the hitching arm 32 is rotatably connected to the fixed shaft lever 31, long sliding holes are formed in the front side and the rear side of the shell 41, the front side end and the rear side end of the leveling piece 5 respectively slide in the two long sliding holes, the cross section of the bottom end of the leveling piece 5 is a tip, the tip of the leveling piece 5 faces the unloading device 2, the right side of the bottom of the shell 41 is an upward inclined plane, the bottoms of two sides of the inner cavity of the hanging sleeve 33 are provided with inclined planes, and the overlay pavement structure 1 is formed by combining a surface wearing layer 11 and a bonding layer 10; the bottom of the overlay pavement structure 1 is provided with a pavement 9, a surface wearing layer 11 is paved on the surface of the pavement 9 through a bonding layer 10, an oil storage tank is arranged inside the unloading equipment 2, two high-pressure oil spraying machines are further arranged at the bottom end of the tail part of the unloading equipment 2, viscous layer oil is stored in the oil storage tank and is connected with the high-pressure oil spraying machines through pipelines, and a self-made spray rod and a self-made spray nozzle are arranged behind the high-pressure oil spraying machines and are used for uniformly spraying the viscous layer oil to the pavement; the surface wearing layer comprises the asphalt mixture of claim 1, and the following raw materials in parts by weight: 100 parts of asphalt, 25-30 parts of modified emulsified asphalt, 58-65 parts of coarse and fine aggregates, 4-10 parts of filler, 15-20 parts of polydimethylsiloxane oil and 30-40 parts of nano-clay.
6. A high-ductility ultra-thin overlay which is formed by the paving method of claim 5.
7. The high-ductility ultra-thin cover surface of claim 6, which is characterized by a thickness of 1.2cm to 1.5cm and a service life of 8 to 10 years.
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