Anti-skid reconstruction construction method for asphalt pavement
阅读说明：本技术 沥青路面抗滑再造施工方法 (Anti-skid reconstruction construction method for asphalt pavement ) 是由 邱昌春 付建村 王春林 李振丰 于 2021-05-29 设计创作，主要内容包括：本发明公开了一种沥青路面抗滑再造施工方法,属于道路工程领域。所述实施方法包括：S1.采用环保型粗糙化处理设备对沥青路面进行粗糙化处理；S2.利用洒布设备喷洒长效、耐磨、疏水涂层材料,所述涂层材料由特定配比的主溶剂一、沥青胶结料、功能填料、改性母料、稳定剂、催干剂制备而成,20℃时的涂层材料测试的布氏粘度为2000-4000cPs。与现有技术相比,本发明实施方法解决了沥青路面抗滑性下降和路面抗松散能力下降之间的技术矛盾,实现了路面安全性能和耐久性能的协同提升,实施工艺简便、性能稳定,具有很好的推广应用价值。(The invention discloses an anti-skid reconstruction construction method for an asphalt pavement, and belongs to the field of road engineering. The implementation method comprises the following steps: s1, adopting environment-friendly roughening treatment equipment to roughen an asphalt pavement; s2, spraying a long-acting, wear-resistant and hydrophobic coating material by using spraying equipment, wherein the coating material is prepared from a main solvent I, an asphalt cementing material, a functional filler, a modified master batch, a stabilizer and a drier in a specific ratio, and the Brookfield viscosity of the coating material at 20 ℃ is 2000-4000 cPs. Compared with the prior art, the implementation method of the invention solves the technical contradiction between the reduction of the skid resistance of the asphalt pavement and the reduction of the loosening resistance of the pavement, realizes the synergistic improvement of the safety performance and the durability of the pavement, has simple and convenient implementation process and stable performance, and has good popularization and application values.)
1. The anti-skid reconstruction construction method for the asphalt pavement is characterized by comprising the following steps of:
s1, roughening treatment is carried out on asphalt pavement
Transverse force coefficient after treatment SFC60Not less than 50, and the structure depth TD not less than 0.8 mm;
s2, spraying long-acting hydrophobic coating material by using spraying equipment
The long-acting hydrophobic coating material is mainly prepared from the following raw materials in parts by weight:
the first main solvent is an organic solvent;
the asphalt cement is low-grade and high-softening-point asphalt;
the coating material has a Brookfield viscosity of 2000-4000cPs at 20 ℃.
2. The asphalt pavement anti-skid reconstruction construction method according to claim 1, characterized in that: the asphalt pavement is tested before roughening treatment, and the transverse force coefficient SFC is measured60Less than 45 and/or the structure depth TD less than 0.45, adopting environment-friendly roughening treatmentThe equipment carries out roughening treatment on the asphalt pavement.
3. The environment-friendly roughening treatment apparatus according to claim 2, wherein: the rotating speed of the shot blasting machine is 2800-.
4. The asphalt pavement anti-skid reconstruction construction method according to claim 1, characterized in that: when the long-acting hydrophobic coating material is sprayed, the spraying amount is 0.6 to 1.3Kg/m2。
5. The anti-skid reconstruction construction method for the asphalt pavement according to claim 1, wherein the whole preparation process of the long-acting hydrophobic coating material is carried out in a closed container under the protection of nitrogen, and comprises the following steps:
A1. heating the asphalt cement to the temperature of 120-150 ℃, and then cooling the asphalt cement to a state of maintaining a flowing and transportable state to obtain a component A;
A2. mixing the first main solvent and the modified master batch at the temperature of 30-60 ℃, and uniformly stirring to obtain a component B;
A3. slowly adding the component A into the component B, mixing, then sequentially adding the stabilizer, the drier and the functional filler, and uniformly stirring to obtain the long-acting wear-resistant hydrophobic coating material for the asphalt pavement.
6. The asphalt pavement anti-skid reconstruction construction method according to claim 1 or 5, characterized in that:
the modified master batch is prepared from a second main solvent, a modifier, an anti-permeability agent and a coupling agent;
the weight ratio of the main solvent II to the modifier to the anti-permeability agent to the coupling agent is (30-55) to (8-17) to (7-19) to (4-11);
the second main solvent is one or a mixture of more of 120# solvent oil, 140# solvent oil, 200# solvent oil, light diesel oil and gasoline;
the modifier is one or a mixture of more of styrene-butadiene copolymer, styrene-butadiene-styrene triblock copolymer and neoprene latex;
the anti-permeability agent is an unsaturated fatty acid substance, has a melting point of less than or equal to 20 ℃ and a number average molecular weight of less than or equal to 400, and is a mixture of one or more of oleic acid, palmitoleic acid and soybean oleic acid;
the coupling agent is vinyl silane coupling agent.
7. The anti-skid reconstruction construction method for the asphalt pavement according to claim 6, characterized in that the preparation method of the modified master batch comprises the following steps:
stirring the main solvent II and the anti-permeability agent at 30-60 ℃ until the main solvent II and the anti-permeability agent are completely dissolved under the protection of nitrogen in a closed container, then sequentially adding the coupling agent and the modifying agent, continuously stirring for a certain time, naturally cooling to room temperature, and then carrying out ultrasonic treatment for a certain time to obtain the activated modified master batch.
8. The asphalt pavement anti-skid reconstruction construction method according to claim 7, characterized in that: the ultrasonic treatment time is 10-30min, and the vibration frequency is 30-40 KHz.
9. The asphalt pavement anti-skid reconstruction construction method according to claim 1 or 5, characterized in that:
the first main solvent is one or a mixture of more of 120# solvent oil, 140# solvent oil, 200# solvent oil, light diesel oil and gasoline;
the penetration degree of the asphalt cement at 25 ℃ is less than or equal to 50(0.1mm), the softening point is more than or equal to 65 ℃, and the asphalt cement is a mixture of one or more substances of rock asphalt, Trinidad lake asphalt, 50# asphalt, 40# asphalt, 30# asphalt, 20# asphalt and 10# asphalt;
the functional filler is powder ground by basic rock or super basic rock, has the fineness of not less than 200 meshes and comprises one or a mixture of more of ground marble, limestone, basalt, granite, dolomite, talcum powder, carborundum or steel slag powder;
the stabilizer is lignocellulose;
the drier is one or a mixture of two of naphthenic acid soap and sulfite.
Technical Field
The invention relates to the field of road engineering, and particularly provides an asphalt pavement anti-skid reconstruction construction method capable of improving the anti-skid performance of an asphalt pavement.
Background
Along with the rapid development of economy in China, the requirements for rapid, safe and comfortable driving of roads are more and more emphasized, the control of the road surface anti-skid standard is also more and more emphasized, and if the road surface friction force is insufficient, namely the anti-skid performance is poor, the safety performance cannot be guaranteed, the conditions of vehicle collision, rear-end collision and the like are easily caused, so that the increase of the anti-skid performance of the road surface is of great importance.
The main technical means for improving the skid resistance of the pavement comprise maintenance cover surface, maintenance sealing layer and mechanization, wherein the maintenance cover surface is mostly in discontinuous dense grading distribution of SMA (styrene-maleic anhydride) and the like, and the main technical means has the advantages of obvious improvement of the skid resistance, high cost and multiple use in corrective maintenance.
The maintenance seal is mainly divided into a fog seal, a stone chip seal, a slurry seal and a micro-surfacing. The fog seal is formed by spraying a fog of emulsified asphalt or rejuvenating agent onto the aged asphalt pavement to rejuvenate and reduce the oxidized asphalt of the pavement. The spraying equipment is adopted for spraying, the construction method is simple, but the anti-friction capability of the pavement can be reduced, the original asphalt pavement is only compensated by the loss of an asphalt film, the abrasion resistance is poor, the anti-permeability retention capability is weak, and the service life is generally only 1-2 years. Chipsealing is the spraying of a layer of bituminous material (hot bitumen, light bitumen, emulsified bitumen, etc.) on the road surface followed by the spreading of a suitable amount of aggregate and followed by rolling. The initial curing time is long, the bonding property with the old pavement is poor, and the aggregate is easy to dissipate under the condition of rolling the wheels. The slurry seal is a slurry mixture composed of emulsified asphalt, crushed aggregate, mineral powder, water and additive. The micro-surfacing is an ultra-thin layer mixture composed of modified emulsified asphalt, aggregates with certain gradation, mineral powder, water and additives. The slurry seal layer and the micro-surfacing are evenly stirred and then paved on the original asphalt pavement, and the slurry seal layer and the micro-surfacing have certain anti-wear effect, but have the problems of large driving noise, poor durability, poor adhesion with the old pavement, unstable emulsion breaking time, large maintenance difficulty after local damage and the like.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the anti-skid reconstruction construction method for the asphalt pavement, which can realize the synergistic improvement of the anti-skid performance and the durability of the pavement.
The technical task of the invention is realized by the following modes: an anti-skid reconstruction construction method for an asphalt pavement comprises the following steps:
s1, roughening treatment is carried out on asphalt pavement
Transverse force coefficient after treatment SFC60Not less than 50, and the structure depth TD not less than 0.8 mm;
s2, spraying long-acting hydrophobic coating material by using spraying equipment
The long-acting hydrophobic coating material is mainly prepared from the following raw materials in parts by weight:
the composition is mainly prepared from the following raw materials in parts by weight:
the first main solvent is an organic solvent;
the asphalt cement is low-grade and high-softening-point asphalt;
the coating material has a Brookfield viscosity of 2000-4000cPs at 20 ℃.
According to the implementation method, the original pavement is roughened, so that the construction depth and the skid resistance of the pavement are improved, the driving safety of the pavement is improved, loose and disturbed aggregates are removed from the roughened pavement, fresh aggregates and textures are exposed, the asphalt film missing in the roughening process is supplemented through implementation of the coating, and the permeation resistance and the scattering resistance of the asphalt pavement are improved. The risk that the loosening resistance is reduced possibly caused by a single roughening technology and the risk that the skid resistance of the asphalt pavement is reduced possibly caused by a single fog seal are solved, and the skid resistance and the durability of the pavement are synergistically improved.
Preferably, the weight ratio of the raw materials is as follows:
preferably, the asphalt pavement is tested for the lateral force coefficient SFC before the roughening treatment in step S160And (3) roughening the asphalt pavement with the structure depth TD of less than 45 and/or the structure depth TD of less than 0.45 by adopting environment-friendly roughening equipment.
Preferably, the coefficient of transverse force after the roughening treatment is controlled to 50 to 70, and the depth of texture is controlled to 0.8 to 1.3 mm.
The environment-friendly roughening treatment equipment is special operation equipment which can be additionally arranged on a second-class chassis of a special automobile and can finish roughening treatment of a pavement, and the structure of the equipment is divided into a traveling device, a shot blasting working device, a recovery device, a separation device, a shot supply device, a dust suction device, a hydraulic driving device, a power device and the like, wherein the rotating speed of a shot blasting machine is 2800-4500r/min, the shot blasting power is 7.5-25kw, the particle size of shot blasting is controlled to be 1.0-2.0mm, and the shot blasting amount is controlled to be 100-350 kg/min.
Preferably, when the long-acting hydrophobic coating material is sprayed in step S2, the spraying operation can be performed by using a high-pressure spraying vehicle, and the spraying amount is preferably 0.6-1.3Kg/m2。
The optimum spraying amount for different pavement types and diseases is shown in table 1.
TABLE 1 optimal spray amount for different pavement types and conditions of damage
Road surface type
Description of major diseases
Spreading amount range (Kg/m)2)
AC asphalt concrete pavement
Burnishing, loosening, loss of asphaltic membrane
0.6～0.85
SMA asphalt concrete pavement
Loose, missing bituminous membrane
0.9～1.3
Asphalt macadam pavement
Loosening
10～1.3
AK asphalt concrete pavement
Loose, missing bituminous membrane
1.0～1.3
In the implementation process, the anti-skid capacity and the texture of the asphalt pavement can be divided into three states of rough, moderate and smooth, and generally, the low limit of the recommended spreading amount is preferably adopted in the state of partial smoothness.
The spraying pressure of the pump of the high-pressure spraying vehicle is preferably 18-22Kg, the flow control of the mixture is preferably 320-350Kg/min, the driving speed is preferably controlled at 7-9Km/h, the speed and the spraying amount of the spraying equipment are kept stable during spraying, and the spraying is uniform within the whole spraying width range. The height from the ground of the spray pipe of the spray vehicle is preferably 350-450 mm and can be fixed, the distance between adjacent oil nozzles is preferably 200-400 mm, the spraying widths of the oil nozzles are overlapped with each other, materials sprayed by two or three oil nozzles are received at the same place, and the occurrence of white stripes is avoided.
Preferably, the whole preparation process of the long-acting hydrophobic coating material is carried out in a closed container under the protection of nitrogen, and the preparation method comprises the following steps:
A1. heating the asphalt cement to the temperature of 120-150 ℃, and then cooling the asphalt cement to a state of maintaining a flowing and transportable state to obtain a component A;
A2. mixing the first main solvent and the modified master batch at the temperature of 30-60 ℃, and uniformly stirring to obtain a component B;
A3. slowly adding the component A into the component B, mixing, then sequentially adding the stabilizer, the drier and the functional filler, and uniformly stirring to obtain the long-acting wear-resistant hydrophobic coating material for the asphalt pavement.
Preferably, the modified master batch is prepared from a second main solvent, a modifier, an anti-permeability agent and a coupling agent,
the weight ratio of the main solvent II to the modifier to the anti-permeability agent to the coupling agent is (30-55) to (8-17) to (7-19) to (4-11), preferably (45-55) to (12-17) to (15-19) to (8-11);
the second main solvent is one or a mixture of more of 120# solvent oil, 140# solvent oil, 200# solvent oil, light diesel oil and gasoline;
the modifier is preferably one or a mixture of more of styrene-butadiene copolymer, styrene-butadiene-styrene triblock copolymer and neoprene latex;
the anti-permeability agent is an unsaturated fatty acid substance, has a melting point of less than or equal to 20 ℃ and a number average molecular weight of less than or equal to 400, is used for improving interface bonding, and is preferably a mixture of one or more substances selected from oleic acid, palmitoleic acid and soybean oleic acid;
the coupling agent is vinyl silane coupling agent.
Further, the preparation method of the modified master batch is preferably as follows:
and under the protection of nitrogen, stirring the main solvent II and the anti-permeability agent at the temperature of 30-60 ℃ until the main solvent II and the anti-permeability agent are completely dissolved, then sequentially adding the coupling agent and the modifying agent, continuously stirring for a certain time, naturally cooling to room temperature, and then carrying out ultrasonic treatment for a certain time to obtain the activated modified master batch.
The treatment time of the ultrasonic treatment is preferably 10 to 30min, particularly preferably 15 to 25 min; the vibration frequency is preferably 30 to 40KHz, particularly preferably 23 to 27 KHz.
Preferably, the first main solvent is a mixture of one or more of 120# solvent oil, 140# solvent oil, 200# solvent oil, light diesel oil and gasoline.
In order to ensure the stability of the coating material under high temperature conditions, the asphalt cement preferably has a penetration degree of less than or equal to 50(0.1mm) at 25 ℃ and a softening point of more than or equal to 65 ℃, and is particularly preferably a mixture of one or more of rock asphalt, Trinidad lake asphalt, 50# asphalt, 40# asphalt, 30# asphalt, 20# asphalt and 10# asphalt.
Preferably, the functional filler is ground powder of basic rock or super basic rock, the fineness is not less than 200 meshes, and particularly preferably one or more of ground marble, limestone, basalt, granite, dolomite, talcum powder, carborundum or steel slag powder.
Preferably, the stabilizer is lignocellulose with a fiber length of 100-500 microns (preferably 200-300 microns).
Preferably, the drier is one or a mixture of two of naphthenic acid soap and sulfite (such as sodium sulfite, magnesium sulfite and the like).
In order to improve other construction characteristics of the coating material, a flavoring agent can be added into the coating material, and ethyl acetate is preferred; the colorant is preferably an organic colorant of acrylic resin type or epoxy resin type, or an inorganic colorant of carbon black, iron oxide, manganese dioxide, chromium oxide, phthalocyanine blue, ultramarine blue, or the like.
Compared with the prior art, the anti-skid reconstruction construction method for the asphalt pavement has the following outstanding beneficial effects:
after the original pavement is subjected to roughening treatment, the construction depth and the skid resistance of the pavement are improved, the driving safety of the pavement is improved, loose and disturbed aggregates are removed from the roughened pavement, fresh aggregates and textures are exposed, an asphalt film which is lost in the roughening treatment process is supplemented through the implementation of a coating, and the permeation resistance and the scattering resistance of the asphalt pavement are improved. The risk of reduction of loosening resistance possibly caused by simple roughening and the risk of reduction of the skid resistance of the asphalt pavement possibly caused by simple coating implementation are solved, and the skid resistance and the durability of the pavement are synergistically improved;
the adopted asphalt cementing material has the characteristics of low grade, high softening point and the like, has good compatibility with a main solvent, has good workability during construction, can shorten drying time after construction, and can ensure good high-temperature stability during use;
the environment-friendly organic solvent is adopted, so that the solubility and the post-construction volatility are higher, the hydrophobicity and the water stability are improved compared with the traditional emulsified water-based asphalt-based coating in the market, and the environment-friendly property is improved compared with the traditional aromatic hydrocarbon organic solvent;
fourthly, the activation modified master batch obtained by a specific method has higher adhesive strength and has the characteristics of excellent weather resistance, seepage resistance, durability and the like;
and (V) the functional filler is taken as the main component of the coating material, and can be well combined with the asphalt cement under the action of the activated modified master batch, and the specific mechanism is as follows: double bonds in unsaturated fatty acid in the modified master batch are subjected to cross-linking polymerization in the ultrasonic activation process to form an oligomeric amphiphilic surface active substance, wherein a long-chain part can be well fused with an asphaltene micelle to form a sol-gel structure, and a hydrophilic part can be fused with inorganic salt of a functional filler, so that the existence of the unsaturated fatty acid enhances the tight bonding degree between the functional filler and an asphalt binder, thereby improving the wear resistance, the skid resistance and other auxiliary functions of the coating material;
the lignocellulose is adopted as the stabilizer, and due to the excellent flexibility and dispersibility of the lignocellulose, the lignocellulose can form a three-dimensional net structure after being mixed with the asphalt binder, so that the adhesion between the asphalt binder and the functional filler is further increased, the layered segregation is avoided, and the stability and durability of the coating material are improved;
the addition of the drier plays roles of improving the filming speed of the asphalt mixed coating material and accelerating the curing when the coating material acts on the damaged asphalt pavement;
(eighthly), when the coating material acts on the damaged asphalt pavement, various components can be uniformly dispersed on the exposed aggregate surface to play an effective protection role: wherein the functional filler and the asphalt binder in the coating material can form high-stiffness asphalt mastic on the surface of the bare aggregate, thereby improving the wear resistance of the pavement; the alkoxy of the silane coupling agent in the coating material can generate carbonyl reaction with the carbonic acid group on the surface of the functional filler, and silanol bonds are mutually associated to form a surface film to be attached to the surface of the bare aggregate, so that the close fusion between the coating material and the bare aggregate is further enhanced;
the interaction of all materials in the coating material not only ensures that the coating material has stable storage, uniform spraying, fast solvent volatilization after spraying, good adhesion (adhesion grade 5 grade), excellent wear resistance (service life 6-10 years), but also can ensure the specific proper fluidity (20 ℃ Brookfield viscosity is 2000-;
tenth, the road surface roughening treatment can be carried out through a large-scale mechanical shot blasting process, shot balls with large particle sizes are directionally thrown out by utilizing centrifugal force and cracks generated by a shot blasting wheel driven by a motor in a high-speed rotating process to form a certain fan-shaped flow beam, the impact road surface plays a role in cleaning and strengthening, and aggregates which are loosened and disturbed on the original road surface are thoroughly removed.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the following specific embodiments, but the invention is not limited by the following embodiments, namely, the embodiments are part of the embodiments of the invention, but not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows: preparation of modified masterbatch
TABLE 2 modified masterbatch Material ratios and parameter control
Description of materials:
oleic acid: molecular weight of 282.46, melting point of 13-14 ℃;
palmitoleic acid: molecular weight 254.41, melting point 0.5 ℃;
soybean oleic acid: 280-284 of molecular weight and 15 ℃ of melting point.
[ PREPARATION METHOD ]
Adding the main solvent II and the anti-permeability agent in the formula amount into a small reaction kettle, magnetically stirring for 20min at 50 ℃ to completely dissolve the main solvent II and the anti-permeability agent, then sequentially adding the silane coupling agent and the modifying agent, maintaining the temperature, continuously stirring for 40min, naturally cooling to room temperature, and then carrying out ultrasonic treatment to obtain activated modified master batches which are respectively marked as master batch 1, master batch 2, master batch 3, master batch 4, master batch 5, master batch 6, master batch 7 and master batch 8. The whole test process is carried out in a closed reaction container, and nitrogen is filled for deoxygenation before the test.
Example two: and (4) preparing a coating material.
TABLE 3 coating materials ratio
Description of materials:
qingchuan rock asphalt: penetration 3(0.1mm) at 25 ℃ and softening point 220 ℃;
50# asphalt: penetration 45(0.1mm) at 25 deg.C, softening point 67 deg.C;
pitch # 40: penetration 38(0.1mm) at 25 deg.C, softening point 70 deg.C;
30# asphalt: penetration 28(0.1mm) at 25 ℃ and softening point 72 ℃.
[ PREPARATION METHOD ]
A1, heating the asphalt cement to over 135 ℃, and then cooling to a state of maintaining a flowing and transportable state to obtain a component A;
A2. mixing the first main solvent and the modified master batch at the temperature of 50 ℃, and uniformly stirring to obtain a component B;
A3. and slowly adding the component A into a main stirrer of the component B for mixing, then sequentially adding the stabilizer, the drier and the functional filler, and uniformly stirring to obtain the final asphalt pavement long-acting hydrophobic coating materials which are marked as example one, example two, example three, example four, example five, example six, example seven and example eight.
The steps A1-A3 are all carried out in a closed container under the protection of nitrogen.
Example three: road surface spray test
[ working vehicle and parameter control ]
1. The environment-friendly road surface roughening equipment (additionally arranged on a second-class chassis of a special automobile):
maximum flow of the hydraulic pump: 280L/min;
the maximum rotating speed and power of the shot blasting machine are as follows: 4000r/min,90 kw;
the power of the dust collector is as follows: 60 kw;
the working width is as follows: 2.2 m;
the operation speed is as follows: 20 m/min.
2. Halik-CH-32000I professional high-pressure spray truck:
spraying flow rate: 347 Kg/min;
spraying pressure: 20 Kg;
the speed per hour of the operation: 8 Km/h;
height above ground of the sprinkling pipe: 400 mm;
adjacent oil nozzle spacing: 300 mm.
[ working procedures ]
S1, shot blasting treatment is carried out on the asphalt pavement
Testing the original asphalt concrete pavement to obtain the lateral force coefficient SFC60Less than 45 and the structure depth TD less than 0.45. The asphalt pavement is roughened by environment-friendly roughening equipment to realize anti-skid reconstruction, and the post-construction control index is that the transverse force coefficient is not less than 50 and the construction depth is not less than 0.8 mm.
S2, spraying long-acting hydrophobic coating material by using spraying equipment
The coating materials obtained by the preparation method of the second embodiment are poured into a container of a spraying vehicle, and after being uniformly stirred, a pavement spraying test is carried out, wherein the spraying amount is 1.0Kg/m2。
[ test results ]
TABLE 4 test results
As can be seen from the data detected in Table 4, the various properties of the materials of all the above examples meet the construction quality requirements. The structural depth, the friction coefficient and the transverse force coefficient of the pavement are far higher than the standard quality requirements, which shows that the loosening resistance and the skid resistance of the pavement are greatly improved after the original pavement is subjected to roughening treatment, and the skid resistance and the durability of the pavement can be synergistically improved; the test result of the road surface water seepage coefficient is 0, which shows that the hydrophobicity of the road surface is greatly improved after the hydrophobic coating is implemented; the bonding strength and the wear resistance data show that the strength and the durability of the asphalt pavement after anti-skid reconstruction and coating implementation are improved, and the service life of the pavement is greatly prolonged.
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