Two-stage reaction curing type fog seal and method of construction thereof

Abstract

The application discloses a two-stage reaction curing type fog seal and a construction method thereof. The two-stage reaction curing type fog seal comprises 50-80% of emulsified asphalt, 10-40% of resin binder, 4-6% of rubber, 1-2% of emulsifier, 1-1.5% of talcum powder, 0.2-0.5% of anti-aging agent and 0.02-0.05% of starch, and the quality is in percentage. Through two-stage curing reaction, the initial strength is formed within 30-60 minutes after the first reaction stage is completed, the water is completely evaporated, and the traffic can be opened; the final strength is formed within 72 hours after the initial strength is formed in the second reaction stage. The application solves the problems of the traditional emulsified asphalt type fog seal, such as insufficient maintenance durability and easy skidding after construction, and realizes rapid opening of traffic.

Description

Technical Field

[0001] This invention relates to the field of road engineering technology, specifically to a two-stage reaction-curing fog seal and its construction method. Background Technology

[0002] Currently, over 80% of the pavement of my country's completed expressways and first-class highways is asphalt pavement. Under the action of vehicle wheels, free asphalt at the bottom of the asphalt surface layer migrates upwards, causing asphalt accumulation on the surface. High-speed vehicle wheels also carry away excess asphalt from the surface. Over time, the free asphalt at the bottom of the pavement gradually becomes insufficient to compensate for the asphalt loss at the surface, resulting in a decreasing asphalt content in the asphalt mixture and an increasing porosity, making it easier for free water to penetrate the asphalt surface layer. Poor adhesion between asphalt and aggregate, leading to spalling, results in a loose asphalt surface, aggregate loss, and subsequent pavement defects such as pumping, potholes, and further damage at patched areas.

[0003] Fog seal is an effective method for preventative maintenance of asphalt pavements. The maintenance mechanism of fog seal mainly falls into two categories: first, it uses emulsified or modified emulsified asphalt to replenish the original asphalt lost from the pavement surface, forming a short-term protective layer; second, it uses reducing agents sprayed onto the pavement surface to improve the problem of aging and hardening of the original asphalt. Because the fog seal material appears as a black mist when sprayed, it is called fog seal.

[0004] Traditional emulsified asphalt is inexpensive as a fog sealing material, but it lacks durability and is prone to slipping after application. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, a two-stage reaction-curing fog seal and its construction method are provided to solve the problems of insufficient curing durability and easy slippage after construction of traditional emulsified asphalt fog seals.

[0006] To achieve the above objectives, a two-stage reaction-cured fog seal is provided, comprising emulsified asphalt and a latex composition. The latex composition includes a resin binder, rubber, emulsifier, talc, anti-aging agent, and starch. Based on the mass percentage of the two-stage reaction-cured fog seal, the two-stage reaction-cured fog seal comprises 50%–80% emulsified asphalt, 10%–40% resin binder, 4%–6% rubber, 1%–2% emulsifier, 1%–1.5% talc, 0.2%–0.5% anti-aging agent, and 0.02%–0.05% starch.

[0007] Furthermore, the mass ratio of the emulsified asphalt to the latex composition is 7:3.

[0008] Furthermore, it includes 65.98% emulsified asphalt, 28.37% resin binder, 2.97% rubber, 1.32% emulsifier, 1% talc, 0.33% anti-aging agent, and 0.03% starch.

[0009] Furthermore, the emulsifier is at least one of alkyl polyamine cationic surfactants, quaternary ammonium salt cationic surfactants, amide amine cationic surfactants, or lignin amine cationic surfactants.

[0010] Furthermore, the emulsified asphalt is 70# base asphalt or 90# base asphalt.

[0011] This invention provides a method for constructing a two-stage reaction-curing fog seal coating, comprising the following steps:

[0012] The original road surface was washed and large cracks in the original road surface were repaired using rubber asphalt;

[0013] Preparation of a two-stage reaction-cured fog seal layer;

[0014] The second-stage reaction-curing fog seal is sprayed onto the repaired original road surface at a rate of 0.4–0.8 kg / m². 2 The first reaction curing stage of the two-stage reaction-curing fog seal layer forms initial strength within 30 to 60 minutes after spraying as the moisture completely evaporates, and the second reaction curing stage of the two-stage reaction-curing fog seal layer forms final strength within 72 hours after the initial strength is formed.

[0015] Furthermore, after spraying the second-stage reaction-cured fog seal layer, sandblasting is performed on the original road surface where the second-stage reaction-cured fog seal layer was sprayed, with a sandblasting amount of less than 2 kg / m². 2 .

[0016] Furthermore, the step of preparing the second-order reaction-cured fog seal includes:

[0017] Rubber is added to emulsified asphalt and stirred evenly to obtain the first mixture;

[0018] The resin binder, emulsifier, and talc are added to the first mixture and stirred until homogeneous to obtain the second mixture;

[0019] Anti-aging agent and starch are added to the second mixture and stirred evenly to obtain the second-stage reaction-cured fog seal layer.

[0020] Furthermore, in the step of adding rubber to emulsified asphalt and stirring evenly to obtain the first mixture, the stirring time is 20 to 35 minutes.

[0021] Furthermore, in the step of adding the resin binder, emulsifier, and talc to the first mixture and stirring evenly to obtain the second mixture, the stirring speed is 150-200 r / min and the stirring time is 25-30 min.

[0022] The beneficial effects of this invention are as follows: the two-stage reaction-cured fog seal of this invention achieves rapid traffic opening while meeting traffic flow indicators through a two-stage reaction. Initial strength is achieved within 30-60 minutes after the completion of the first reaction stage as moisture evaporates completely. Final strength is achieved within 72 hours after the initial strength is reached in the second reaction stage. The two-stage reaction-cured fog seal of this invention has minimal impact on the anti-skid performance of the road surface, preserving the original anti-skid properties. Furthermore, the two-stage reaction-cured fog seal of this invention is significantly superior to ordinary emulsified asphalt fog seals and modified emulsified asphalt fog seals in terms of cost and extended road surface life, with lower annual life-cycle costs and fewer maintenance cycles, resulting in excellent economic benefits. Detailed Implementation

[0023] The present application will now be described in further detail with reference to the embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit the invention.

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present application will now be described in detail with reference to the embodiments.

[0025] The present invention provides a two-stage reaction-cured fog seal, comprising an emulsified asphalt and a latex composition.

[0026] The latex composition includes a resin binder, rubber, emulsifier, talc, anti-aging agent, and starch.

[0027] Specifically, based on the mass percentage of the two-stage reaction-cured fog seal, the two-stage reaction-cured fog seal includes 50-80% emulsified asphalt, 10-40% resin binder, 4-6% rubber, 1-2% emulsifier, 1-1.5% talc, 0.2-0.5% anti-aging agent, and 0.02-0.05% starch.

[0028] As a preferred embodiment, the mass ratio of emulsified asphalt to latex composition is 7:3.

[0029] In this embodiment, the two-stage reaction-cured fog seal layer comprises 65.98% emulsified asphalt, 28.37% resin binder, 2.97% rubber, 1.32% emulsifier, 1% talc, 0.33% anti-aging agent, and 0.03% starch.

[0030] In this embodiment, the emulsifier is at least one of alkyl polyamine cationic surfactants, quaternary ammonium salt cationic surfactants, amide amine cationic surfactants, or lignin amine cationic surfactants.

[0031] In this embodiment, the emulsified asphalt is 70# base asphalt or 90# base asphalt.

[0032] As a preferred embodiment, the anti-aging agent is at least one of benzophenone-based ultraviolet absorbers, salicylate-based ultraviolet absorbers, benzotriazole-based ultraviolet absorbers, and triazine-based ultraviolet absorbers.

[0033] This invention provides a two-stage reaction-curing fog seal that, after spraying, achieves rapid traffic opening while meeting traffic standards through a two-stage reaction. Specifically, the initial strength is formed within 30-60 minutes after the completion of the first reaction stage as the moisture completely evaporates; the final strength is formed within 72 hours after the initial strength is formed in the second reaction stage.

[0034] This invention provides a method for constructing a two-stage reaction-curing fog seal coating, comprising the following steps:

[0035] S1. Wash the original road surface and repair the large cracks in the original road surface with rubber asphalt.

[0036] S2. Preparation of a second-order reaction-cured fog seal layer.

[0037] Specifically, step S2, which involves preparing a second-order reaction-cured fog seal, includes:

[0038] S21. Add rubber to emulsified asphalt and stir evenly to obtain the first mixture.

[0039] When performing the step of adding rubber to emulsified asphalt and stirring evenly to obtain the first mixture, the stirring time is 20 to 35 minutes.

[0040] S22. Add the resin binder, emulsifier, and talc to the first mixture and stir until homogeneous to obtain the second mixture.

[0041] When performing the step of adding resin binder, emulsifier, and talc to the first mixture and stirring evenly to obtain the second mixture, the stirring speed is 150-200 r / min and the stirring time is 25-30 min.

[0042] S23. Add the anti-aging agent and starch to the second mixture and stir evenly to obtain a two-stage reaction-cured fog seal layer.

[0043] When the anti-aging agent and starch are added to the second mixture and stirred for 15 minutes, a second-stage reaction-cured fog seal is obtained after defoaming.

[0044] S3. Apply a two-stage reactive curing fog seal coat to the repaired original road surface at a rate of 0.4–0.8 kg / m². 2 .

[0045] S4. After applying the second-stage reaction-curing fog seal, sandblast the original road surface where the second-stage reaction-curing fog seal was applied, with a sandblasting amount of less than 2 kg / m². 2 .

[0046] The first reaction stage of the two-stage reaction-cured fog seal forms initial strength within 30 to 60 minutes after construction as the moisture evaporates completely. The second reaction stage of the two-stage reaction-cured fog seal forms final strength within 72 hours after the initial strength is formed.

[0047] To illustrate the performance of the second-order reaction-cured fog seal of the present invention, the following examples and comparative examples are provided.

[0048] Example 1

[0049] This embodiment provides a two-stage reaction-cured fog seal coating, composed of latex material and emulsified asphalt, wherein the mass ratio of latex material to emulsified asphalt is 30%:70%. The latex composition includes resin binder, rubber, emulsifier, talc, anti-aging agent, and starch.

[0050] The specific preparation steps of the second-order reaction-cured fog seal layer proposed in this embodiment are as follows:

[0051] a. Add 45 parts by weight of rubber to 1000 parts by weight of emulsified asphalt (70# emulsified asphalt) and stir for 30 minutes using a mixer;

[0052] b. Then, put 430 parts by weight of the two-component resin binder (polymer), 20 parts by weight of the fast-cracking cationic emulsifier and 15 parts by weight of the talc powder (early strength agent) into the mixer and stir at 150 rpm for 30 minutes.

[0053] c. Finally, add 5 parts by mass of ultraviolet absorber and 0.4 parts by mass of starch (stabilizer), and continue stirring for 15 minutes. After defoaming, a second-stage reaction-cured fog seal is obtained.

[0054] Comparative Example 1

[0055] Ordinary emulsified asphalt fog seal.

[0056] Comparative Example 2

[0057] Modified emulsified asphalt fog seal, specifically 4% SBS modified emulsified asphalt.

[0058] Performance testing

[0059] The present invention obtains the test results of its material properties and actual road performance through experiments and tests.

[0060] Material performance tests were conducted using Example 1, with ordinary emulsified asphalt and modified emulsified asphalt as Comparative Examples 1 and 2. Test items included evaporation residue content, three major evaporation residue indicators, rotational viscosity, curing time, adhesion to coarse aggregate, bond strength, UV aging resistance, anti-skid performance, and economic benefits. Specific results are shown in the table below:

[0061] According to the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011), the evaporation residue content test was conducted, and the test results of the evaporation residue content of Example 1, ordinary emulsified asphalt and modified emulsified asphalt are shown in Tables 1 to 8 below.

[0062] Table 1. Content of Evaporation Residue

[0063] type Comparative Example 1 Comparative Example 2 Example 1 Evaporation residue content / % 46.1 51.5 55.1

[0064] The penetration, softening point, and ductility of ordinary emulsified asphalt, modified emulsified asphalt, and environmentally friendly water-based penetrating curing agent for asphalt pavement were tested. The test results are shown in Table 2 below.

[0065] Table 2. Three major indicators of evaporation residue

[0066] Experimental Project Comparative Example 1 Comparative Example 2 Example 1 Needle penetration (25℃) / (0.1mm) 75.0 101.2 105.3 Softening point / °C 44.3 53.1 58.3 <![CDATA[Ductility (5°C, 5 cm·s -1 ) / cm]]> 7.3 33.7 41.9

[0067] The rotational viscosity of Example 1, Comparative Example 1 and Comparative Example 2 was determined by rotational viscosity test. A 21# rotor was used and the test was conducted at a speed of 50 revolutions per minute. The experimental results are shown in Table 3 below.

[0068] Table 3. Rotational Viscosity

[0069] Types of materials Viscosity at 25℃ / MPa·s Viscosity at 35℃ / MPa·s Viscosity at 45℃ / MPa·s Comparative Example 1 4 3.1 2.2 Comparative Example 2 77.5 44.5 19.5 Example 1 98.5 57.6 27.6

[0070] The adhesion properties of Example 1, Comparative Example 1, and Comparative Example 2 were evaluated using basalt coarse aggregate.

[0071] Curing time refers to the end time of the first stage reaction, and is judged by two indicators: surface dry time and actual dry time. Surface dry time is the time for the material surface to dry and form a film; it is considered surface dry when the film layer is not visibly adhered to the naked eye when lightly touched with a finger. Actual dry time is the time for the material's moisture to completely evaporate; it is considered actual dry when the bottom of the film layer is dry after being cut with a blade. Example 1 was tested at 10℃, 30℃, and 50℃, and the results are shown in Table 4 below.

[0072] Table 4. Results of Coating Curing and Drying Tests

[0073]

[0074]

[0075] Note: "Ⅰ" indicates no action was taken, "Ⅱ" indicates action was taken but not implemented, and "Ⅲ" indicates implementation.

[0076] Bond strength: By comparing Example 1, Comparative Example 1, and Comparative Example 2 at 0.3 kg / m 2 0.6kg / m 2 0.8kg / m 2 The coating amount was tested for tensile strength at 25℃ with a loading rate of 0.5MPa / s. The test results are shown in Table 5 below.

[0077] Table 5. Results of pull-out strength test

[0078] type <![CDATA[0.4kg / m 2 ]]> <![CDATA[0.6kg / m 2 ]]> <![CDATA[0.8kg / m 2 ]]> Comparative Example 1 / MPa 0.75 1.05 1.08 Comparative Example 2 / MPa 0.66 0.98 0.92 Example 1 / MPa 1.28 1.58 1.52

[0079] UV aging resistance: Example 1, Comparative Example 1, and Comparative Example 2 were used as samples with a UV aging resistance of 0.6 kg / m³. 2 The coating amount was evenly applied to the marble slab, which was then placed in an ultraviolet aging chamber. The radiation amount was calculated based on the irradiation time. The pull-out strength before and after ultraviolet aging is shown in Table 6 below.

[0080] Table 6. Pull-out strength before and after UV aging

[0081]

[0082] Example 1, Comparative Example 1, and Comparative Example 2 were prepared at a concentration of 0.6 kg / m³. 2 The material was evenly sprayed onto the rut slab, and its anti-skid performance was evaluated by measuring the texture depth and swing angle. The test results are shown in Tables 7 and 8 below.

[0083] Table 7. Depth of Structure

[0084] type blank Comparative Example 1 Comparative Example 2 Example 1 Depth / mm 1.02 0.93 0.89 0.85

[0085] Table 8. Pendulum Values

[0086] type blank Comparative Example 1 Comparative Example 2 Example 1 coefficient of friction 59 56 55 55

[0087] The specific survey results on the preventive maintenance effect and cost of using Example 1 and Comparative Examples 1 and 2 are shown in Table 9 below.

[0088] Table 9. Comparative Analysis of the Economic Benefits of Different Preventive Maintenance Programs over Their Life Cycles

[0089] Preventive maintenance type Comparative Example 1 Comparative Example 2 Example 1 Extend road surface life (in years) 0.5 1 3 <![CDATA[Unit price (yuan / m 2 )]]> 8.0 30～40 45 <![CDATA[Annual life cycle cost (yuan / m 2 )]]> 16 30～40 15

[0090] Based on the above test results, the following conclusions can be drawn:

[0091] The evaporation residue content of the two-stage reaction-cured fog seal layer of this invention is significantly higher than that of ordinary emulsified asphalt, and the three major residue indicators are all higher than those of ordinary and modified emulsified asphalt, exhibiting better high and low temperature performance.

[0092] The rotational viscosity of the second-stage reaction-cured fog seal layer of this invention is close to that of ordinary modified emulsified asphalt, and the adhesion area with coarse aggregate is greater than 90%, thus exhibiting good permeability and adhesion effects.

[0093] The curing and drying time of the first reaction stage of the two-stage reaction-curing fog seal of the present invention can be controlled within 1 hour at a suitable temperature. The higher the temperature, the shorter the curing and drying time. In actual construction, the construction time can be controlled within 5 hours, realizing rapid road maintenance and having good social benefits.

[0094] The two-stage reaction-cured fog seal coating of this invention, through coating amount control testing, shows a maximum pull-out strength of 0.6 kg / m. 2 The maximum pull-out strength of the second-order reaction-cured fog seal of the present invention is 1.58 MPa, which is much greater than the maximum values ​​of 0.98 MPa and 1.12 MPa of ordinary and modified emulsified asphalt, respectively.

[0095] After 344 hours of ultraviolet irradiation, the pull-out strength of all materials decreased. However, the strength of the second-order reaction-cured fog seal layer of the present invention after aging was the highest at 0.97 MPa and the lowest at 36.2%, and its anti-aging performance was significantly better than that of the comparative example.

[0096] The two-stage reactive curing fog seal of the present invention, in the texture depth and pendulum test, showed a slight decrease in texture depth and skid resistance value compared to the original pavement, but the decrease was small and still met the specifications. This indicates that the two-stage reactive curing fog seal of the present invention has little impact on the skid resistance of the pavement and can retain the skid resistance of the original pavement.

[0097] The two-stage reaction-curing fog seal of this invention is significantly superior to ordinary emulsified asphalt fog seal and modified emulsified asphalt fog seal in terms of cost and extended pavement life. It has low annual life cost, fewer maintenance cycles, and good economic benefits.

[0098] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A two-stage reaction-cured fog sealant, characterized in that, The mixture comprises emulsified asphalt and a latex composition, wherein the latex composition includes a resin binder, rubber, emulsifier, talc, anti-aging agent, and starch. Based on the mass percentage of the two-stage reaction-cured fog seal, the two-stage reaction-cured fog seal comprises 50%–80% emulsified asphalt, 10%–40% resin binder, 4%–6% rubber, 1%–2% emulsifier, 1%–1.5% talc, 0.2%–0.5% anti-aging agent, and 0.02%–0.05% starch. The second-stage reaction-curing fog seal is sprayed onto the repaired original road surface at a rate of 0.4~0.8 kg / m². 2 The first reaction curing stage of the two-stage reaction-curing fog seal layer forms initial strength within 30 to 60 minutes after spraying as the moisture completely evaporates, and the second reaction curing stage of the two-stage reaction-curing fog seal layer forms final strength within 72 hours after the initial strength is formed.

2. The second order reactive, curable fog seal of claim 1, wherein, The mass ratio of the emulsified asphalt to the latex composition is 7:

3.

3. The two-stage reaction-cured fog seal layer according to claim 1, characterized in that, It includes 65.98% emulsified asphalt, 28.37% resin binder, 2.97% rubber, 1.32% emulsifier, 1% talc, 0.33% anti-aging agent, and 0.03% starch.

4. The second order reactive curable fog seal of claim 1 wherein, The emulsifier is at least one of alkyl polyamine cationic surfactants, quaternary ammonium salt cationic surfactants, amide amine cationic surfactants, or lignin amine cationic surfactants.

5. The second order reactive curable fog seal of claim 1 wherein, The emulsified asphalt is either 70# base asphalt or 90# base asphalt.

6. A method for applying the second order reactive curable fog seal of any one of claims 1 to 5, characterized by, Includes the following steps: The original road surface was washed and large cracks in the original road surface were repaired using rubber asphalt; Preparation of a two-stage reaction-cured fog seal layer; The second-stage reaction-curing fog seal coating is sprayed onto the repaired original road surface at a rate of 0.4~0.8 kg / m². 2 The first reaction curing stage of the two-stage reaction-curing fog seal layer forms initial strength within 30 to 60 minutes after spraying as the moisture completely evaporates, and the second reaction curing stage of the two-stage reaction-curing fog seal layer forms final strength within 72 hours after the initial strength is formed.

7. The construction method according to claim 6, characterized in that, After applying the two-stage reaction-cured fog seal coating, sandblasting is performed on the original road surface where the coating was applied, with a sandblasting amount of less than 2 kg / m². 2 .

8. The construction method according to claim 6, characterized in that, The steps for preparing the second-order reaction-cured fog seal layer include: Rubber is added to emulsified asphalt and stirred evenly to obtain the first mixture; The resin binder, emulsifier, and talc are added to the first mixture and stirred until homogeneous to obtain the second mixture; Anti-aging agent and starch are added to the second mixture and stirred evenly to obtain the second-stage reaction-cured fog seal layer.

9. The construction method according to claim 8, characterized in that, When performing the step of adding rubber to emulsified asphalt and stirring evenly to obtain the first mixture, the stirring time is 20~35 minutes.

10. The construction method according to claim 8, characterized in that, When adding the resin binder, emulsifier, and talc to the first mixture and stirring until homogeneous to obtain the second mixture, the stirring speed is 150~200 r / min and the stirring time is 25~30 min.

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