Asphalt pavement hydrophobic material and preparation method thereof

Abstract

The invention provides an asphalt pavement hydrophobic material and a preparation method thereof, and belongs to the technical field of pavement hydrophobic materials. The asphalt pavement hydrophobic material comprises 100-150 parts of modified asphalt, 10-15 parts of sodium methyl silicate, 5-10 parts of methyl silicone resin, 4-10 parts of a film-forming agent, 10-15 parts of sodium acetate and 10-20 parts of zeolite powder. According to the asphalt pavement hydrophobic material disclosed by the invention, sodium methyl silicate and methyl silicone resin are used as water repellents to improve the hydrophobicity of the hydrophobic material, and sodium acetate is used as a snow-melting agent and has a synergistic effect with the water repellents to improve the deicing efficiency of the pavement; the modified asphalt is used as a matrix of the hydrophobic material, so that the hydrophobic material has higher durability, stability and aging resistance, long-time maintenance of an asphalt pavement is facilitated, and the maintenance cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of pavement hydrophobic materials, and in particular to an asphalt pavement hydrophobic material and a preparation method thereof. Background Art

[0002] Asphalt pavement refers to various types of pavement paved with road asphalt materials mixed into mineral materials. Asphalt binder improves the ability of paving aggregate to resist damage to the road surface caused by driving and natural factors, making the road surface smooth, dust-free, impermeable, and durable. In most parts of my country, roads will freeze in winter. The frozen road surface will have a huge impact on transportation, human production, and life, such as car accidents caused by car tire slippage in winter, and road closures at airports due to ground icing.

[0003] The transportation industry is an important foundation and necessary condition for the development of the national economy and society, especially the highways, which play an important role. While the highways are developing rapidly, the road surface is also facing severe tests. The structural form of the highway pavement in my country mainly adopts semi-rigid base asphalt pavement, which has very serious early damage. The highways have a large traffic volume and many overloaded vehicles. They are also affected by adverse climate and environment, which leads to the rapid and serious development of asphalt pavement diseases such as cracks, oil spills, rutting, looseness, potholes, etc., making the effective service time of highways generally less than the designed service life. If the highway has serious early damage, the service life of the pavement will be reduced and the cost of highway maintenance and repair will be increased.

[0004] Among the early damage phenomena of asphalt pavement, water damage and road icing caused by cold weather are more serious types of damage, with a large degree of damage and a wide range. Water damage will cause moisture to gradually invade the interface between asphalt and aggregate, causing the asphalt film to gradually peel off from the aggregate surface, and the asphalt mixture to gradually lose its adhesion. The asphalt pavement will have looseness, grain loss, slurry, cracks, potholes and other defects of varying sizes, which seriously endanger the performance of the pavement structure. In addition, road icing seriously affects driving safety and the anti-skid effect of the pavement. The direct harm is that ice will reduce the adhesion between the wheels and the pavement, causing the vehicle to slip and roll over, which will affect the normal passage of the highway, bring great hidden dangers to road traffic safety, and cause huge economic losses. To prevent the problem of water damage to asphalt pavement, improving the drainage and waterproof performance of the pavement structure is the most direct and effective measure. Reducing the accumulation of water on the pavement can directly prevent water from entering the asphalt pavement structure and causing damage. There are three commonly used deicing methods for existing asphalt pavements. First, relying on manual removal: inefficient and not suitable for large-scale use. Second, physical methods: such as snowplows, which are expensive and have obvious destructive effects on the pavement. 3. Chemical method: mainly spreading deicing salt, which is widely used because of its simplicity, ease and obvious effect. However, the harm of spreading deicing salt is very serious. It can cause hardening and impoverishment of the surrounding soil, pollution of drinking water, corrosion of vehicle bodies, roads and ancillary facilities.

[0005] Based on this, it is of great practical significance to provide an asphalt pavement hydrophobic material with high hydrophobicity and high snow-melting and ice-melting efficiency. Summary of the invention

[0006] The purpose of the present invention is to provide a hydrophobic material for an asphalt pavement and a preparation method thereof, aiming to solve the technical problems of inconvenient deicing of asphalt pavements and low snow and ice melting efficiency in the prior art.

[0007] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0008] The present invention provides an asphalt pavement hydrophobic material, comprising the following components:

[0009] Modified asphalt, sodium methyl silicate, methyl silicone resin, film former, sodium acetate and zeolite powder.

[0010] Furthermore, the mass parts of the components are: 100-150 parts of modified asphalt, 10-15 parts of sodium methyl silicate, 5-10 parts of methyl silicone resin, 4-10 parts of film-forming agent, 10-15 parts of sodium acetate, and 10-20 parts of zeolite powder.

[0011] Furthermore, the modified asphalt is SBS modified emulsified asphalt.

[0012] Furthermore, the concentration of sodium acetate is 30-40 wt %.

[0013] Furthermore, the particle size of the zeolite powder is 200-300 meshes.

[0014] Furthermore, the film-forming agent includes acrylic acid and polyvinyl chloride, and the usage ratio of acrylic acid to polyvinyl chloride is 1-2:1-2.

[0015] The present invention also provides a method for preparing the asphalt pavement hydrophobic material according to the above technical solution, characterized in that it comprises the following steps:

[0016] Adding zeolite powder to sodium acetate for a first mixing to obtain a modified snow-melting agent;

[0017] The modified deicing agent is mixed with modified asphalt and a film-forming agent for a second time to obtain a first mixture;

[0018] Sodium methyl silicate and methyl silicone resin are added to the first mixture for a third mixing to obtain the asphalt pavement hydrophobic material.

[0019] Furthermore, the first mixing is allowed to stand for 12 to 24 hours, and then filtered and dried.

[0020] Furthermore, the temperature of the second mixing is 150-160° C., the time is 40-50 minutes, and the stirring rate is 300-500 rpm.

[0021] Furthermore, the third mixing is carried out at a temperature of 150 to 170° C., for 20 to 30 minutes, and at a stirring rate of 300 to 500 rpm.

[0022] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0023] (1) The present invention uses modified asphalt as the matrix of the hydrophobic material, so that the hydrophobic material has higher durability, stability and aging resistance, has a longer service life when used as a coating material for the road surface, and is convenient for the maintenance of the asphalt road surface;

[0024] (2) The present invention uses sodium acetate as a deicing agent, and modifies the deicing agent by mixing zeolite powder with the deicing agent; after the deicing agent plays a role in melting snow and ice, it will cause the problem of reduced road friction coefficient, and the presence of zeolite powder will solve this problem, thereby ensuring that vehicles can drive normally when the road surface is icy in winter. The use of zeolite powder to adsorb the deicing agent can play a role in slow release of the deicing agent, and also make the deicing agent better preserved, which can extend the durability of the hydrophobic material;

[0025] (3) The present invention also adds a film-forming agent, namely acrylic acid and polyvinyl chloride. After the film-forming agent is mixed with the modified asphalt, when the hydrophobic material is used as a coating material for the asphalt pavement, a dense protective film can be formed. At this time, after the deicing agent plays a role in melting snow and ice, the ice layer close to the road surface melts, thereby forming a gap between the ice layer and the ground, and the ice layer in the gap is easily crushed by pedestrians or vehicles to achieve the technical purpose of high deicing efficiency;

[0026] (4) The present invention also adds sodium methyl silicate and methyl silicone resin as water repellents to further improve the hydrophobicity of the hydrophobic material. When the film-forming agent forms a protective film on the asphalt pavement, the two complement each other so that the melted water will not penetrate into the ground, thereby improving the service life of the asphalt pavement. DETAILED DESCRIPTION

[0027] Among the early damage phenomena of asphalt pavement, water damage and road icing caused by cold weather are more serious types of damage, with a large degree of damage and a wide range. Water damage will cause moisture to gradually invade the interface between asphalt and aggregate, causing the asphalt film to gradually peel off from the aggregate surface, and the asphalt mixture to gradually lose its adhesion. The asphalt pavement will have looseness, grain loss, slurry, cracks, potholes and other defects of varying sizes, which seriously endanger the performance of the pavement structure. In addition, road icing seriously affects driving safety and the anti-skid effect of the pavement. The direct harm is that ice will reduce the adhesion between the wheels and the pavement, causing the vehicle to slip and roll over, which will affect the normal passage of the highway, bring great hidden dangers to road traffic safety, and cause huge economic losses. To prevent the problem of water damage to asphalt pavement, improving the drainage and waterproof performance of the pavement structure is the most direct and effective measure. Reducing the accumulation of water on the pavement can directly prevent water from entering the asphalt pavement structure and causing damage. There are three commonly used deicing methods for existing asphalt pavements. First, relying on manual removal: inefficient and not suitable for large-scale use. Second, physical methods: such as snowplows, which are expensive and have obvious destructive effects on the pavement. 3. Chemical method: mainly spreading deicing salt, which is widely used because of its simplicity, ease and obvious effect. However, the harm of spreading deicing salt is very serious. It can cause hardening and impoverishment of the surrounding soil, pollution of drinking water, corrosion of vehicle bodies, roads and ancillary facilities.

[0028] Based on this, it is of great practical significance to provide an asphalt pavement hydrophobic material with high hydrophobicity and high snow-melting and ice-melting efficiency.

[0029] The invention provides an asphalt pavement hydrophobic material, comprising the following components: modified asphalt, sodium methyl silicate, methyl silicone resin, a film-forming agent, sodium acetate and zeolite powder.

[0030] In the present invention, the mass parts of the components are preferably: 100-150 parts of modified asphalt, 10-15 parts of sodium methyl silicate, 5-10 parts of methyl silicone resin, 4-10 parts of film-forming agent, 10-15 parts of sodium acetate, and 10-20 parts of zeolite powder; more preferably, 100-120 parts of modified asphalt, 10-12 parts of sodium methyl silicate, 5-8 parts of methyl silicone resin, 4-6 parts of film-forming agent, 10-12 parts of sodium acetate, and 10-12 parts of zeolite powder.

[0031] In the present invention, the modified asphalt is preferably SBS modified emulsified asphalt.

[0032] The present invention adopts modified asphalt as the matrix of the hydrophobic material, so that the hydrophobic material has higher durability, stability and aging resistance, has a longer service life when used as a coating material for the road surface, and is convenient for the maintenance of the asphalt road surface.

[0033] In the present invention, the concentration of sodium acetate is preferably 30-40 wt%, more preferably 30-35 wt%.

[0034] In the present invention, the particle size of the zeolite powder is preferably 200-300 mesh, and more preferably 200-250 mesh.

[0035] In the present invention, the film-forming agent preferably includes acrylic acid and polyvinyl chloride, and the usage ratio of acrylic acid to polyvinyl chloride is preferably 1-2:1-2, and more preferably 1:1.

[0036] In the present invention, acrylic acid and polyvinyl chloride are added as film-forming agents. After the film-forming agent is mixed with modified asphalt, when the hydrophobic material is used as a coating material for an asphalt pavement, a dense protective film can be formed. At this time, after the deicing agent plays a role in melting snow and ice, the ice layer close to the road surface melts, thereby forming a gap between the ice layer and the ground, and the ice layer in the gap is easily crushed by pedestrians or vehicles to achieve the technical purpose of high deicing efficiency.

[0037] The present invention also provides a method for preparing the asphalt pavement hydrophobic material according to the above technical solution, characterized in that it comprises the following steps:

[0038] Adding zeolite powder to sodium acetate for a first mixing to obtain a modified snow-melting agent;

[0039] The modified deicing agent is mixed with modified asphalt and a film-forming agent for a second time to obtain a first mixture;

[0040] Sodium methyl silicate and methyl silicone resin are added to the first mixture for a third mixing to obtain the asphalt pavement hydrophobic material.

[0041] Adding zeolite powder to sodium acetate for a first mixing to obtain a modified snow-melting agent;

[0042] The present invention uses sodium acetate as a deicing agent, and modifies the deicing agent by mixing zeolite powder with the deicing agent; after the deicing agent plays a role in melting snow and ice, it will cause the problem of reduced road friction coefficient, and the presence of zeolite powder will solve this problem, thereby ensuring that vehicles can drive normally when the road surface is icy in winter. Zeolite powder is used to adsorb the deicing agent, which can play a role of slow-release of the deicing agent, and also makes the deicing agent better preserved, which can extend the durability of the hydrophobic material.

[0043] In the present invention, after the first mixing, the mixture is preferably allowed to stand for 12 to 24 hours and then filtered and dried; more preferably, the mixture is allowed to stand for 18 to 24 hours and then filtered and dried.

[0044] The modified deicing agent is mixed with modified asphalt and a film-forming agent for a second time to obtain a first mixture;

[0045] In the present invention, the temperature of the second mixing is preferably 150-160° C., more preferably 150-155° C., the time is preferably 40-50 minutes, more preferably 40-45 minutes, and the stirring rate is preferably 300-500 rpm, more preferably 300-400 rpm.

[0046] Sodium methyl silicate and methyl silicone resin are added to the first mixture for a third mixing to obtain the asphalt pavement hydrophobic material.

[0047] The present invention also adds sodium methyl silicate and methyl silicone resin as water repellents to further improve the hydrophobicity of the hydrophobic material. When the film-forming agent forms a protective film on the asphalt pavement, the two complement each other so that the melted water will not penetrate into the ground, thereby improving the service life of the asphalt pavement.

[0048] In the present invention, the temperature of the third mixing is preferably 150-170°C, more preferably 150-160°C, the time is preferably 20-30 minutes, more preferably 20-25 minutes, and the stirring rate is preferably 300-500 rpm, more preferably 300-400 rpm.

[0049] In the present invention, unless otherwise specified, the required raw materials for preparation are all commercially available products well known to those skilled in the art.

[0050] The technical solutions provided by the present invention are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0051] Example 1

[0052] (1) adding 10 parts of zeolite powder with a particle size of 200 meshes to 10 parts of sodium acetate with a mass concentration of 30%, stirring, stirring evenly and letting stand for 12 hours, then filtering, and drying the filtered product to obtain a modified snow melting agent;

[0053] (2) stirring and mixing the modified snow-melting agent with 100 parts of SBS modified emulsified asphalt and 4 parts of a film-forming agent at a temperature of 150° C. for 40 minutes at a stirring rate of 300 rpm to obtain a first mixture, wherein the 4 parts of the film-forming agent include 2 parts of acrylic acid and 2 parts of polyvinyl chloride;

[0054] (3) Add 10 parts of sodium methyl silicate and 5 parts of methyl silicone resin to the first mixture, stir and mix at a temperature of 150° C. for 20 minutes at a stirring rate of 300 rpm to obtain the asphalt pavement hydrophobic material.

[0055] Example 2

[0056] (1) adding 12 parts of zeolite powder with a particle size of 250 meshes to 12 parts of sodium acetate with a mass concentration of 35%, stirring, stirring evenly, leaving the mixture to stand for 18 hours, filtering, and drying the filtered product to obtain a modified snow melting agent;

[0057] (2) stirring and mixing the modified deicing agent with 12 parts of SBS modified emulsified asphalt and 6 parts of a film-forming agent at a temperature of 155° C. for 45 minutes at a stirring rate of 400 rpm to obtain a first mixture, wherein the 6 parts of the film-forming agent include 2 parts of acrylic acid and 4 parts of polyvinyl chloride;

[0058] (3) 12 parts of sodium methyl silicate and 8 parts of methyl silicone resin are mixed and stirred in the first mixture at a temperature of 150° C. and a stirring rate of 300 rpm for 20 minutes to obtain the asphalt pavement hydrophobic material.

[0059] Example 3

[0060] (1) adding 20 parts of zeolite powder with a particle size of 300 meshes to 15 parts of sodium acetate with a mass concentration of 40%, stirring, stirring evenly, leaving the mixture to stand for 24 hours, filtering, and drying the filtered product to obtain a modified snow melting agent;

[0061] (2) stirring and mixing the modified snow-melting agent with 150 parts of SBS modified emulsified asphalt and 10 parts of a film-forming agent at a temperature of 160° C. for 50 minutes at a stirring rate of 500 rpm to obtain a first mixture, wherein the 10 parts of the film-forming agent include 5 parts of acrylic acid and 5 parts of polyvinyl chloride;

[0062] (3) 15 parts of sodium methyl silicate and 10 parts of methyl silicone resin are added to the first mixture and stirred at a temperature of 170° C. for 30 minutes at a stirring rate of 500 rpm to obtain the asphalt pavement hydrophobic material.

[0063] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A hydrophobic material for asphalt pavement, characterized in that: The invention comprises the following components: modified asphalt, sodium methyl silicate, methyl silicone resin, film-forming agent, sodium acetate and zeolite powder.

2. The asphalt pavement hydrophobic material according to claim 1, characterized in that: The mass parts of the components are respectively: 100-150 parts of modified asphalt, 10-15 parts of sodium methyl silicate, 5-10 parts of methyl silicone resin, 4-10 parts of film-forming agent, 10-15 parts of sodium acetate and 10-20 parts of zeolite powder.

3. The asphalt pavement hydrophobic material according to claim 1, characterized in that: The modified asphalt is SBS modified emulsified asphalt.

4. The asphalt pavement hydrophobic material according to claim 1, characterized in that: The concentration of the sodium acetate is 30-40 wt %.

5. The asphalt pavement hydrophobic material according to claim 1, characterized in that: The particle size of the zeolite powder is 200-300 meshes.

6. The asphalt pavement hydrophobic material according to claim 1, characterized in that: The film-forming agent comprises acrylic acid and polyvinyl chloride, and the usage ratio of acrylic acid to polyvinyl chloride is 1-2:1-2.

7. The method for preparing the asphalt pavement hydrophobic material according to any one of claims 1 to 6, characterized in that: The following steps are involved: Adding zeolite powder to sodium acetate for first mixing to obtain a modified snow-melting agent; The modified deicing agent is mixed with modified asphalt and a film-forming agent for a second time to obtain a first mixture; Sodium methyl silicate and methyl silicone resin are added to the first mixture for a third mixing to obtain the asphalt pavement hydrophobic material.

8. The method for preparing the asphalt pavement hydrophobic material according to claim 7, characterized in that: The first mixing is allowed to stand for 12 to 24 hours, and then filtered and dried.

9. The method for preparing the asphalt pavement hydrophobic material according to claim 7, characterized in that: The second mixing is performed at a temperature of 150-160° C., for a time of 40-50 minutes, and at a stirring rate of 300-500 rpm.

10. The method for preparing the asphalt pavement hydrophobic material according to claim 7, characterized in that: The third mixing is performed at a temperature of 150 to 170° C., for 20 to 30 minutes, and at a stirring rate of 300 to 500 rpm.