CN112012073B - Method for improving drainage performance of double-layer drainage asphalt pavement - Google Patents

Abstract

The invention discloses a method for improving drainage performance of a double-layer drainage asphalt pavement, belongs to the technical field of drainage asphalt pavements, and solves the problems of pore blockage and drainage performance reduction caused by deposition of dust particles in pores of the double-layer drainage asphalt pavement at present. According to the invention, silane compounds, nano white carbon black and other materials are selected to prepare the super-hydrophobic solution, a high-pressure water spray gun is used for uniformly spraying the super-hydrophobic solution on the upper and lower structural layers of the double-layer drainage asphalt pavement and the asphalt mixture around gaps, the spraying amount is controlled, a contact angle and constant head permeameter is used for testing the actual drainage performance and the self-cleaning effect, the optimal spraying amount is determined, the drainage performance of the double-layer drainage asphalt pavement is further improved, meanwhile, water flow in the gaps is used for cleaning, the self-cleaning effect is achieved, and the probability of pore blockage is reduced. The method for improving the drainage performance of the double-layer drainage asphalt pavement can improve the pore blockage phenomenon and improve the drainage capacity, and has a good self-cleaning effect.

Description

Method for improving drainage performance of double-layer drainage asphalt pavement

Technical Field

The invention discloses a method for improving drainage performance of a double-layer drainage asphalt pavement, and belongs to the technical field of drainage asphalt pavements.

Background

The double-layer drainage asphalt pavement is used as a main pavement form for reducing noise and mainly comprises a thin small-gap drainage asphalt layer and a thick large-gap drainage asphalt layer below the thin small-gap drainage asphalt layer. The drainage bituminous construction layer of lower floor is mainly through improving the side direction drainage, can eliminate the way surface water film, compares in traditional drainage bituminous paving, and the discharge road surface retention water that can be very fast. In addition, the middle and small gap drainage asphalt layer in the double-layer drainage asphalt pavement can block large-particle dust, most of the particle size dust is left in the surface layer and the pores of the surface layer of the road, so that the dust does not fall into the lower layer, the filter screen is used, and the dust particles falling into the lower layer can be discharged out of the pavement through the pores under the action of water flow. The double-layer drainage asphalt pavement is a novel drainage asphalt pavement, is greatly promoted in the aspect of solving the problems of unsmooth drainage and the like caused by pore blockage and the like of the traditional drainage asphalt pavement, and has more and more applications in more and more newly-built expressways, such as Sichuan kansui eyebrow resources expressways and Ningyu xu expressways, and test sections are paved.

However, in the process of long-time service, the double-layer drainage asphalt pavement is affected by the deposition of environmental dust particles, and the gaps between the upper and lower drainage asphalt structure layers are still blocked to different degrees, i.e. the drainage performance and the noise reduction performance of the road are reduced. According to construction experience at home and abroad, even if the problem of pore blockage of the double-layer drainage asphalt pavement through the small-pore structure layer is prevented, the trend that the pore blockage and the drainage capacity and the sound absorption and noise reduction capacity are greatly reduced can not be effectively avoided. According to survey statistics, the salt leads to the occurrence of pore blockage of partial road sections at the high-speed coastal section 1 and the high-speed coastal section 2, and the drainage effect is lost after the Bailianjing road in Shanghai world Boyuan is used for two years. The double-layer drainage pavement-Ostersogade city road surface constructed by Denmark (2002) is seriously blocked, and the pavement structure of the Sichuan super highway (2014) adopting 3.5cmPA-10+6.5PA-16 has the problem of reduced drainage performance after being used for half a year. Therefore, researches on the reduction of the drainage capacity and the noise reduction performance of the double-layer drainage asphalt pavement due to the deposition influence of dust particles are increasingly urgent, and a proper method is needed for recovering the drainage performance and the noise reduction performance of the double-layer drainage asphalt pavement.

Therefore, how to drain the asphalt pavement with double-layer drainage becomes one of the important problems of research. In the past, dust particles deposited in the road surface are removed by means of vacuum sweeper, manual sweeping, strong air blast, drainage road surface function recovery vehicle and the like. The method is characterized in that a water drainage pavement function recovery vehicle is used by a learner to wash pores of a water drainage asphalt pavement, the overall cleaning effect is good, but the bonding failure of the aggregate of a road surface part can be caused, so that the surface part is loose. Manual cleaning can partially restore plugged pores, and unrecoverable partial pore cleaning measures remain to be investigated. In addition, foreign scholars verified that the pore blockage was not substantially improved after the suction cleaning of asphalt pavement using the municipal vacuum sweeper. The above solutions for the reduction of drainage and noise reduction caused by the blockage of the drainage asphalt pavement due to the dust deposition have not been verified and have certain limitations. The current new technology for improving the hydrophobicity of materials mainly uses silane, siloxane and fluorination products thereof, and materials such as silicon, silicon dioxide, metal and oxides thereof to prepare super-hydrophobic and self-cleaning surfaces. The scholars prepare the super-hydrophobic solution, and the super-hydrophobic solution is sprayed on the substrate to make the substrate material have super-hydrophobic and self-cleaning properties. In terms of road engineering, the super-hydrophobic technology is applied to the research of the anti-freezing performance of the asphalt pavement, and the research on the super-hydrophobic and self-cleaning technology of the road is lacked.

The conventional pore blocking recovery measures need to invest a large amount of manpower, material resources and financial resources regularly, the pore blocking recovery effect is poor, and even partial aggregate of the drainage asphalt pavement is bonded and failed, so that the drainage asphalt pavement is loosened. In addition, because the contact angle between water and the asphalt mixture is less than 150 degrees, a super-hydrophobic effect cannot be formed, and for dust particles deposited in the drainage asphalt pavement, the self-cleaning effect cannot be achieved by water flow in pores, the dust particles still can be continuously deposited in the pore structure of the drainage asphalt pavement, and if efficient pore structure blockage recovery measures are not taken, the blockage phenomenon of the pore structure is more serious, and the drainage performance of the drainage asphalt pavement is greatly influenced.

Therefore, based on the principle of preparing the super-hydrophobic surface, the invention provides a method for preparing the super-hydrophobic solution by adopting the silane compound and the nano white carbon black, the super-hydrophobic solution is sprayed on the surfaces of pore structures of the upper layer and the lower layer of the double-layer drainage asphalt pavement through a high-pressure spray gun, the contact angle between water and the surface of the asphalt mixture is improved, the surface of the asphalt mixture has the super-hydrophobic function, meanwhile, the water flow in pores is utilized to clean dirt, the self-cleaning effect is achieved, the probability of pore blockage is reduced, and the drainage performance of the double-layer drainage asphalt pavement is improved.

Disclosure of Invention

(1) Technical problem

The invention aims to provide a method for improving the drainage performance of a double-layer drainage asphalt pavement, and solves the problems that the existing double-layer drainage asphalt pavement has poor surface drainage effect and weak self-cleaning capability, and the drainage performance of the double-layer drainage asphalt pavement is reduced due to the fact that dust particles are deposited in pores of the double-layer drainage asphalt pavement to cause pore blockage.

(2) Technical scheme

The problem of current double-deck drainage bituminous paving pore structure surface drainage effect poor, self-cleaning ability weak, cause the double-deck drainage bituminous paving drainage performance to reduce because of the hole jam appears in the deposit of dust particle in double-deck drainage bituminous paving pore is solved in order to solve. The invention firstly prepares the super-hydrophobic solution according to the current super-hydrophobic technical principle, and uniformly sprays the super-hydrophobic solution on the surfaces of the pore structures of the upper layer and the lower layer of the double-layer drainage asphalt pavement by using a high-pressure spray gun, so that the double-layer drainage asphalt pavement has super-hydrophobic and self-cleaning effects. The technical scheme of the invention is as follows: firstly, selecting a silane compound and nano white carbon black to prepare a super-hydrophobic solution, then, respectively and uniformly spraying the super-hydrophobic solution on the upper layer and the lower layer of the double-layer drainage asphalt pavement according to the construction steps of the double-layer drainage asphalt pavement, so that the double-layer drainage asphalt pavement forms a super-hydrophobic surface, and finally, testing the actual drainage effect of the double-layer drainage asphalt pavement, determining the optimal spraying amount of the super-hydrophobic solution, improving the drainage performance of the double-layer drainage asphalt pavement, and simultaneously, utilizing water flow in pores to clear dirt, achieving a self-cleaning effect and reducing the probability of pore blockage.

(3) Advantageous effects

The double-layer drainage asphalt pavement can filter dust particles due to the special double-layer structure, and the dust particles are prevented from falling into the lower drainage asphalt structure layer, so that the problems of unsmooth drainage and the like caused by blockage are avoided. However, with the increase of service life, the double-layer drainage asphalt pavement still has the problems of poor drainage and the like caused by blockage of pores by pollutants such as dust, gravel and the like. The vehicle is easy to sideslip when running on the road, and the water drift phenomenon is generated, so that the safe driving is influenced. Secondly, if the drainage is not smooth due to pore blockage, the dynamic water pressure caused by vehicle load can cause water damage phenomenon on the double-layer drainage asphalt pavement. The invention provides a method for improving the drainage performance of a double-layer drainage asphalt pavement, which is characterized in that prepared super-hydrophobic solution is sprayed on the upper layer and the lower layer of the double-layer drainage asphalt pavement to form super-hydrophobic surfaces, so that the drainage capacity of the double-layer drainage asphalt pavement is improved, and meanwhile, the water flow in pores is utilized to clean up dirt, thereby achieving the self-cleaning effect and reducing the probability of pore blockage.

Detailed Description

The invention provides a method for improving drainage performance of a double-layer drainage asphalt pavement, which comprises the following specific implementation steps of:

(1) Firstly, silane compounds are uniformly mixed into a mixed solution composed of a proper amount of ethanol, deionized water and ammonia water, the mixed solution is heated to 70 ℃, after the hydrolysis reaction is full, a certain amount of nano white carbon black is added, and the obtained solution is stirred for 15min at the rotating speed of 5000r/min by a high-speed magnetic stirrer under the environment of 25 ℃ to prepare uniformly mixed super-hydrophobic emulsion;

(2) forming a porous asphalt mixture track plate test piece on the lower layer of the double-layer drainage asphalt pavement, placing for 24 hours at room temperature, spraying a super-hydrophobic solution to the surface of a pore structure by using a high-pressure spray gun, and then fully spraying modified emulsified asphalt on the surface of the track plate test piece to serve as adhesive layer oil;

(3) paving an upper porous asphalt mixture of the double-layer drainage asphalt pavement, standing at room temperature for 24 hours, and spraying a super-hydrophobic solution to the surface of an upper pore structure of the double-layer drainage asphalt pavement by using a high-pressure spray gun;

(4) adjusting the spraying amount of the super-hydrophobic solution on the upper layer and the lower layer of the double-layer drainage asphalt pavement, respectively testing the contact angle and the rolling angle of the pore structure surfaces of the asphalt mixture on the upper layer and the lower layer under different spraying amounts by using a contact angle tester and a rolling angle tester, and determining the optimal spraying amount of the super-hydrophobic solution;

(5) Certain amounts of dust particles are respectively doped in the pore structures of the upper and lower layers of the double-layer drainage asphalt pavement, and the drainage performance of the upper and lower layers of the double-layer drainage asphalt pavement and the self-cleaning effect of the pore structure surface are tested by using a water seepage meter under the optimal super-hydrophobic solution spraying amount, so that the drainage performance of the double-layer drainage asphalt pavement is improved.

Claims (1)

1. A method for improving the drainage performance of a double-layer drainage asphalt pavement is characterized by comprising the following specific steps:

(1) firstly, silane compounds are uniformly mixed into a mixed solution composed of a proper amount of ethanol, deionized water and ammonia water, the mixed solution is heated to 70 ℃, after the hydrolysis reaction is full, a certain amount of nano white carbon black is added, and the obtained solution is stirred for 15min at the rotating speed of 5000r/min by a high-speed magnetic stirrer under the environment of 25 ℃ to prepare uniformly mixed super-hydrophobic emulsion;

(2) forming a porous asphalt mixture track plate test piece on the lower layer of the double-layer drainage asphalt pavement, placing for 24 hours at room temperature, spraying a super-hydrophobic solution to the surface of a pore structure by using a high-pressure spray gun, and then fully spraying modified emulsified asphalt on the surface of the track plate test piece to serve as adhesive layer oil;

(3) Paving an upper porous asphalt mixture of the double-layer drainage asphalt pavement, standing at room temperature for 24 hours, and spraying a super-hydrophobic solution to the surface of an upper pore structure of the double-layer drainage asphalt pavement by using a high-pressure spray gun;

(4) adjusting the spraying amount of the super-hydrophobic solution on the upper layer and the lower layer of the double-layer drainage asphalt pavement, respectively testing the contact angle and the rolling angle of the pore structure surfaces of the asphalt mixture on the upper layer and the lower layer under different spraying amounts by using a contact angle tester and a rolling angle tester, and determining the optimal spraying amount of the super-hydrophobic solution;

(5) certain amounts of dust particles are respectively doped in the pore structures of the upper and lower layers of the double-layer drainage asphalt pavement, and the drainage performance of the upper and lower layers of the double-layer drainage asphalt pavement and the self-cleaning effect of the pore structure surface are tested by using a water seepage meter under the optimal super-hydrophobic solution spraying amount, so that the drainage performance of the double-layer drainage asphalt pavement is improved.