阅读说明：本技术 一种沥青路面再生封层剂及其制备方法、沥青路面养护方法 (Asphalt pavement regeneration sealing agent, preparation method thereof and asphalt pavement maintenance method ) 是由 曾国东 周敏 黄红明 陈忠云 禹卓杰 黎磊锋 方杨 于 2020-04-13 设计创作，主要内容包括：本发明公开了一种沥青路面再生封层剂及其制备方法、沥青路面养护方法,所述再生封层剂包括以下重量份组分：湖沥青25～30份、芳烃油20～35份、蓖麻油沥青20～30份、废轮胎热解油10～20份、降粘剂1～2份。将本发明的再生封层剂应用在老化沥青路面时,可有效实现老化沥青的再生,提高老化沥青的性能,延迟沥青路面的使用寿命。(The invention discloses an asphalt pavement regeneration sealing agent, a preparation method thereof and an asphalt pavement maintenance method, wherein the regeneration sealing agent comprises the following components in parts by weight: 25-30 parts of lake asphalt, 20-35 parts of aromatic oil, 20-30 parts of castor oil asphalt, 10-20 parts of waste tire pyrolysis oil and 1-2 parts of viscosity reducer. When the regenerated sealing agent is applied to the aged asphalt pavement, the regeneration of the aged asphalt can be effectively realized, the performance of the aged asphalt is improved, and the service life of the asphalt pavement is prolonged.)

1. The asphalt pavement regeneration sealing agent is characterized by comprising the following components in parts by weight: 25-30 parts of lake asphalt, 20-35 parts of aromatic oil, 20-30 parts of castor oil asphalt, 10-20 parts of waste tire pyrolysis oil and 1-2 parts of viscosity reducer.

2. The asphalt pavement recycling sealing agent as set forth in claim 1, wherein said lake asphalt has a softening point of 90 ℃ or higher.

3. The asphalt pavement recycling sealing agent as set forth in claim 2, wherein said lake asphalt satisfies the following conditions: the evaporation loss test determines that the mass loss is less than or equal to 1.5 percent, and the film oven aging test determines that the penetration degree is reduced by less than or equal to 30 percent.

4. The asphalt pavement recycling sealing agent as set forth in claim 1, wherein said castor oil asphalt has a solubility in trichloroethylene of not less than 85%.

5. The asphalt pavement reclamation sealing agent of claim 1, wherein the viscosity reducer is a Fischer-Tropsch wax or a polyethylene wax.

6. The asphalt pavement recycling sealing agent as claimed in claim 1, wherein the viscosity reducer is firstly added into the lake asphalt, the waste tire pyrolysis oil is finally added into the lake asphalt, and the mixing temperature of the waste tire pyrolysis oil is 100-110 ℃.

7. The preparation method of the asphalt pavement regeneration sealing agent is characterized by comprising the following steps:

(1) placing 25-30 parts of lake asphalt and 1-2 parts of viscosity reducer in a reaction container, and uniformly stirring, wherein the temperature is controlled to be 150-160 ℃;

(2) adding 20-35 parts of aromatic oil into the reaction container in the step (1), uniformly stirring, and keeping the temperature;

(3) adding 20-30 parts of castor oil asphalt into the reaction container in the step (2), and uniformly stirring, wherein the temperature is controlled to be 130-140 ℃;

(4) slowly adding 10-20 parts of waste tire pyrolysis oil into the reaction container in the step (3), and uniformly stirring, wherein the temperature is controlled to be 100-110 ℃;

(5) and after the pyrolysis oil of the waste tire is fully dissolved, controlling the temperature at 100-110 ℃, continuously stirring to form a regenerated sealing agent, and sealing and storing after the regenerated sealing agent is naturally cooled to room temperature.

8. The method for preparing the asphalt pavement recycling sealing agent according to claim 7,

in the step (1), mixing for 15-20 min at a speed of 400-500 r/min;

in the step (2), mixing for 15-25 min at the speed of 400-500 r/min;

in the step (3), mixing at the speed of 1400-1500 r/min for 15-25 min;

in the step (4), mixing for 15-20 min at the speed of 20-30 r/min;

in the step (5), the mixture is stirred at a speed of 300-400 r/min for 15-30 min.

9. A method for maintaining an asphalt pavement, characterized in that the asphalt pavement recycling sealer according to any one of claims 1 to 6 is sprayed on the surface of the asphalt pavement.

10. The asphalt pavement maintenance method according to claim 9, wherein the amount of the asphalt pavement recycling sealer is 7 to 10kg/m²。

Technical Field

The invention relates to the technical field of asphalt pavement maintenance, in particular to an asphalt pavement regeneration sealing agent, a preparation method thereof and an asphalt pavement maintenance method.

Background

As the service life of the asphalt road increases, the service performance and the structural performance of the road are attenuated continuously. The traditional maintenance method is to detect the diseases on the road and carry out targeted large, medium and small trimming till milling and re-paving. According to the concept of preventive maintenance, the road should be maintained correspondingly when serious diseases do not appear on the road, and the service life of the road is prolonged. On the other hand, as the service life increases, the asphalt pavement is aged, and the low-temperature performance, the water damage resistance and the durability of the asphalt pavement are all reduced. The traditional regeneration mode is established on the basis of milling and planing the road surface, if the aged asphalt on the road surface can be regenerated when the road is still in the service life, the performance of the aged asphalt is partially recovered, the service life of the road can be effectively prolonged, and better economic benefit can be obtained.

Disclosure of Invention

The invention aims to solve the technical problem of providing an asphalt pavement regeneration sealing agent, which is applied to an aged asphalt pavement to realize regeneration of the aged asphalt, improve the performance of the aged asphalt and delay the service life of the asphalt pavement.

The technical problem to be solved by the invention is to provide a preparation method of the asphalt pavement regeneration sealing agent, and the prepared regeneration sealing agent can realize regeneration of aged asphalt, improve the performance of the aged asphalt and delay the service life of the asphalt pavement when being applied to the aged asphalt pavement.

The invention also aims to solve the technical problem of providing a maintenance method of the asphalt pavement to realize the regeneration of the aged asphalt of the asphalt pavement.

In order to solve the technical problems, the invention provides an asphalt pavement regeneration sealing agent which comprises the following components in parts by weight: 25-30 parts of lake asphalt, 20-35 parts of aromatic oil, 20-30 parts of castor oil asphalt, 10-20 parts of waste tire pyrolysis oil and 1-2 parts of viscosity reducer.

As an improvement of the scheme, the softening point of the lake asphalt is more than or equal to 90 ℃.

As an improvement of the scheme, the lake asphalt meets the following conditions: the evaporation loss test determines that the mass loss is less than or equal to 1.5 percent, and the film oven aging test determines that the penetration degree is reduced by less than or equal to 30 percent.

As an improvement of the scheme, the solubility of the castor oil asphalt in the trichloroethylene is more than or equal to 85 percent.

As an improvement of the scheme, the viscosity reducer is Fischer-Tropsch wax or polyethylene wax.

As an improvement of the scheme, the viscosity reducer is firstly added into the lake asphalt, the waste tire pyrolysis oil is finally added into the lake asphalt, and the mixing temperature of the waste tire pyrolysis oil is 100-110 ℃.

Correspondingly, the invention also provides a preparation method of the asphalt pavement regeneration sealing agent, which comprises the following steps:

(1) placing 25-30 parts of lake asphalt and 1-2 parts of viscosity reducer in a reaction container, and uniformly stirring, wherein the temperature is controlled to be 150-160 ℃;

(2) adding 20-35 parts of aromatic oil into the reaction container in the step (1), uniformly stirring, and keeping the temperature;

(3) adding 20-30 parts of castor oil asphalt into the reaction container in the step (2), and uniformly stirring, wherein the temperature is controlled to be 130-140 ℃;

(4) slowly adding 10-20 parts of waste tire pyrolysis oil into the reaction container in the step (3), and uniformly stirring, wherein the temperature is controlled to be 100-110 ℃;

(5) and after the pyrolysis oil of the waste tire is fully dissolved, controlling the temperature at 100-110 ℃, continuously stirring to form a regenerated sealing agent, and sealing and storing after the regenerated sealing agent is naturally cooled to room temperature.

As an improvement of the scheme, in the step (1), mixing at the speed of 400-500 r/min for 15-20 min;

in the step (2), mixing for 15-25 min at the speed of 400-500 r/min;

in the step (3), mixing at the speed of 1400-1500 r/min for 15-25 min;

in the step (4), mixing for 15-20 min at the speed of 20-30 r/min;

in the step (5), the mixture is stirred at a speed of 300-400 r/min for 15-30 min.

Correspondingly, the invention also provides a maintenance method of the asphalt pavement, and the asphalt pavement regeneration sealing agent is sprinkled on the surface of the asphalt pavement.

As an improvement of the scheme, the spreading amount of the asphalt pavement regeneration sealing agent is 7-10 kg/m²。

The implementation of the invention has the following beneficial effects:

when the regenerated sealing agent is applied to an aged asphalt pavement, lake asphalt in the regenerated sealing agent and ash in the lake asphalt are concentrated on the surface layer of the asphalt pavement to form a new asphalt surface with ageing resistance, durability and water seepage resistance; light components (aromatic oil and waste tire pyrolysis oil) in the regenerated sealing agent penetrate into the aged asphalt, the maximum penetration depth exceeds 2mm, the regeneration of the aged asphalt at the position can be effectively realized, the performance of the aged asphalt is improved, and the service life of the asphalt pavement is prolonged.

The regenerated sealing agent provided by the invention adopts two wastes of castor oil asphalt and waste tire pyrolysis oil, realizes resource recycling and has low cost.

The viscosity reducer is added into the lake asphalt with higher viscosity, so that the mixing temperature of the lake asphalt can be reduced, the energy consumption is reduced, and the mixing temperature is reduced due to the fact that the flash point of the subsequently added waste tire pyrolysis oil is lower, so that the safety is ensured; because the waste tire pyrolysis oil has better fluidity and lower flash point, the waste tire pyrolysis oil is added into the mixed mixture of all the components, so that the fluidity of the regenerated sealing agent is effectively increased, and the safety is ensured.

The regeneration sealing agent can permeate into the aged asphalt pavement with the thickness less than 2mm, so that the regeneration of the aged asphalt of the asphalt pavement is realized; after the regenerated sealing agent is sprayed, the friction coefficient of the pavement is reduced less, and the driving safety is effectively ensured; the vehicle can be recovered to be passed 6 hours after being sprayed, and the passing requirement is guaranteed.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below.

The invention provides a regeneration sealing agent for an asphalt pavement, which is applied to an aged asphalt pavement and comprises the following components in parts by weight: 25-30 parts of lake asphalt, 20-35 parts of aromatic oil, 20-30 parts of castor oil asphalt, 10-20 parts of waste tire pyrolysis oil and 1-2 parts of viscosity reducer.

The asphalt can be classified into two types of asphalt and tar asphalt according to the source, the two types of asphalt include natural asphalt and petroleum asphalt, and the tar asphalt includes coal asphalt and shale asphalt. At present, the asphalt is mainly petroleum asphalt and is large molecular weight residue left after crude oil is artificially distilled. The lake asphalt is one of natural asphalt, which is formed by that petroleum is extruded by earth crust in the nature for a long time and is gradually changed when contacting with air and water, and the natural petroleum asphalt is mixed with clay and water to form an emulsion which is mostly in the form of a lake.

The lake asphalt with good ageing resistance is adopted, so that the durability of the pavement is favorably improved, and the ash content in the lake asphalt contributes to enhancing the strength of the asphalt pavement.

Preferably, the lake asphalt selected by the invention meets the following properties: the softening point is more than or equal to 90 ℃, the mass loss of the film is less than or equal to 1.5 percent when the evaporation loss test (163 ℃ and 5 hours) is used, and the penetration degree of the film is reduced by less than or equal to 30 percent when the film oven aging test (163 ℃ and 5 hours) is used. If the softening temperature of the lake asphalt is less than 90 ℃, the fluidity of the regenerated sealing agent is reduced, and the spreading of the regenerated sealing agent is influenced. If the mass loss of the lake asphalt is more than 1.5 percent and the penetration degree is reduced by more than 30 percent, the aging performance of the lake asphalt is poor and the requirement is not met.

Preferably, the lake asphalt of the present invention is Trinidad lake asphalt, but is not limited thereto.

According to the component migration theory of asphalt aging, the content of aromatic molecules and other small molecules is reduced, and the content of asphaltene and other large molecules is increased in the asphalt aging process. The aromatic oil has the characteristics of good rubber compatibility, high temperature resistance, low volatilization and the like.

According to the invention, the micromolecule substance aromatic oil is added into the regenerated sealing agent, so that the micromolecule content in the asphalt pavement is effectively increased, the performance of the asphalt is improved, and the regeneration of the aged asphalt pavement is realized.

The castor oil asphalt is environment-friendly artificial asphalt and has better low-temperature crack resistance. According to the invention, the castor oil asphalt is added into the regenerated sealing agent, so that the low-temperature crack resistance of the aged asphalt pavement can be improved, and the regeneration of the aged asphalt pavement is realized.

Preferably, the solubility of the castor oil asphalt in trichloroethylene is more than or equal to 85%. If the solubility of the castor oil asphalt in trichloroethylene is less than 85%, the castor oil asphalt has more impurities, which is not beneficial to blending the subsequent mixture.

The waste tire pyrolysis oil is mainly derived from colloid self pyrolysis products in rubber, organic additives in rubber and pyrolysis products thereof, and operation oil (naphthalene oil or anthracene oil) in a rubber production formula, and is a complex mixture with a wide boiling point; in addition, the waste resources can be recycled.

Because the flash point of the waste tire pyrolysis oil is low, the waste tire pyrolysis oil is required to be safe in the hot mixing process, otherwise, the waste tire pyrolysis oil is easy to burn.

Preferably, the viscosity reducer is firstly added into the lake asphalt, the waste tire pyrolysis oil is finally added into the lake asphalt, and the mixing temperature of the waste tire pyrolysis oil is 100-110 ℃. The mixing temperature is less than or equal to 110 ℃ because the flash point of the waste tire pyrolysis oil is low. The viscosity of lake asphalt is high, so that the mixing temperature is more than or equal to 100 ℃ to ensure uniformity.

The viscosity reducer is added into the lake asphalt with higher viscosity, so that the mixing temperature of the lake asphalt can be reduced, the energy consumption is reduced, and the mixing temperature is reduced due to the fact that the flash point of the subsequently added waste tire pyrolysis oil is lower, so that the safety is ensured; because the waste tire pyrolysis oil has better fluidity and lower flash point, the waste tire pyrolysis oil is added into the mixed mixture of all the components, so that the fluidity of the regenerated sealing agent is effectively increased, and the safety is ensured.

The viscosity reducer can reduce the mixing temperature of the regenerated sealing agent, and save energy while ensuring safety. Preferably, the viscosity reducer is fischer-tropsch wax or polyethylene wax, but is not limited thereto. Specifically, the viscosity reducer is added into the regenerated sealing agent, and the mixing temperature can be reduced by 30-50 ℃.

When the regenerated sealing agent is applied to an aged asphalt pavement, lake asphalt in the regenerated sealing agent and ash in the lake asphalt are concentrated on the surface layer of the asphalt pavement to form a new asphalt surface with ageing resistance, durability and water seepage resistance; light components (aromatic oil and waste tire pyrolysis oil) in the regenerated sealing agent penetrate into the aged asphalt, the maximum penetration depth exceeds 2mm, the regeneration of the aged asphalt at the position can be effectively realized, the performance of the aged asphalt is improved, and the service life of the asphalt pavement is prolonged.

The regenerated sealing agent provided by the invention adopts two wastes of castor oil asphalt and waste tire pyrolysis oil, realizes resource recycling and has low cost.

Correspondingly, the invention also provides a preparation method of the regenerated sealing agent for the asphalt pavement, which comprises the following steps:

(1) placing 25-30 parts of lake asphalt and 1-2 parts of viscosity reducer in a reaction container, and uniformly stirring, wherein the temperature is controlled to be 150-160 ℃;

(2) adding 20-35 parts of aromatic oil into the reaction container in the step (1), uniformly stirring, and keeping the temperature;

(3) adding 20-30 parts of castor oil asphalt into the reaction container in the step (2), and uniformly stirring, wherein the temperature is controlled to be 130-140 ℃;

(4) slowly adding 10-20 parts of waste tire pyrolysis oil into the reaction container in the step (3), and uniformly stirring, wherein the temperature is controlled to be 100-110 ℃;

(5) and after the pyrolysis oil of the waste tire is fully dissolved, controlling the temperature at 100-110 ℃, continuously stirring to form a regenerated sealing agent, and sealing and storing after the regenerated sealing agent is naturally cooled to room temperature.

The viscosity of the lake asphalt is high, in order to ensure uniformity, the temperature in the step (1) and the step (2) is 150-160 ℃, and the viscosity reducer is firstly added into the lake asphalt in the step (1), so that the fluidity of the lake asphalt can be improved, the stirring is convenient, and in the step (3), the stirring temperature can be reduced to 130-140 ℃; in the step (4) and the step (5), the mixing temperature is less than or equal to 110 ℃ because the flash point of the pyrolysis oil of the waste tire is low, and the mixing temperature is more than or equal to 100 ℃ to ensure uniformity because the viscosity of the lake asphalt is high.

The viscosity reducer is added into the lake asphalt with higher viscosity, so that the mixing temperature of the lake asphalt can be reduced, the energy consumption is reduced, and the mixing temperature is reduced due to the fact that the flash point of the subsequently added waste tire pyrolysis oil is lower, so that the safety is ensured; because the waste tire pyrolysis oil has better fluidity and lower flash point, the waste tire pyrolysis oil is added into the mixed mixture of all the components, so that the fluidity of the regenerated sealing agent is effectively increased, and the safety is ensured.

Preferably, in the step (1), the mixture is stirred at the speed of 400-500 r/min for 15-20 min;

in the step (2), mixing for 15-25 min at the speed of 400-500 r/min;

in the step (3), mixing at the speed of 1400-1500 r/min for 15-25 min;

in the step (4), mixing for 15-20 min at the speed of 20-30 r/min;

in the step (5), the mixture is stirred at a speed of 300-400 r/min for 15-30 min.

It should be noted that, in the preparation process of the regenerated sealing agent, open fire and sufficient ventilation must be guaranteed, and the storage temperature of the prepared regenerated sealing agent is not higher than 45 ℃.

Correspondingly, the invention also provides an asphalt pavement maintenance method, and the asphalt pavement regeneration sealing agent is sprinkled on the surface of the asphalt pavement. Preferably, the spreading amount of the asphalt pavement regeneration sealing agent is 7-10 kg/m²。

Specifically, the asphalt pavement regeneration sealing agent is uniformly sprayed on the surface of an asphalt road by an asphalt spraying vehicle, and the edge of a curb, various well mouths and areas with non-uniform spraying are uniformly coated by a manual coating method.

The asphalt pavement regeneration sealing agent is used for maintaining the asphalt pavement, so that the service life of the asphalt pavement can be effectively prolonged, and better economic benefit can be obtained.

Specifically, the regeneration sealing agent can permeate into the aged asphalt pavement with the thickness less than 2mm, so that the regeneration of the aged asphalt of the asphalt pavement is realized; after the regenerated sealing agent is sprayed, the friction coefficient of the pavement is reduced less, and the driving safety is effectively ensured; the vehicle can be recovered to be passed 6 hours after being sprayed, and the passing requirement is guaranteed.

The invention will be further illustrated by the following specific examples