A kind of anti-aging colored emulsified asphalt mixture and its preparation method and application

Abstract

The present invention provides an anti-aging colored emulsified asphalt mixture and its preparation method and application, which belong to the technical field of road engineering materials. Measured by mass, the anti-aging colored emulsified asphalt mixture provided by the present invention includes the following raw materials: 35 to 40 parts of stone, 1 to 2.5 parts of cement, 32 to 38 parts of decolorized emulsified asphalt, 5 to 8 parts of pigment, 0.3 to 0.5 parts of anti-aging agent and 2 to 3 parts of stabilizer. The anti-aging colored emulsified asphalt mixture provided by the present invention has high strength, good flexibility, aging resistance, wear resistance, good road performance, and the surface color is well preserved without discoloration and whitening. When the anti-aging colored emulsified asphalt mixture provided by the present invention is applied to road paving, it can meet the technical requirements of road maintenance and the aesthetic requirements of the road.

Description

Technical Field

[0001] The invention belongs to the technical field of road engineering materials, and particularly relates to an anti-aging colored emulsified asphalt mixture and a preparation method and application thereof. Background Art

[0002] Colored pavements paved with colored emulsified asphalt mixtures are brightly colored and beautiful. Compared to traditional black asphalt mixtures, they can effectively define functional zones on the pavement. Their application in municipal projects can help guide traffic flow and beautify the environment. Conventional colored emulsified asphalt mixtures are generally composed of colored emulsified asphalt and stone. However, due to the effects of traffic, rain, oxidation, and ultraviolet light, these colored pavements are prone to aging, failing to meet the technical requirements of pavement maintenance and road aesthetics. Summary of the Invention

[0003] The present invention aims to provide an anti-aging colored emulsified asphalt mixture, its preparation method, and its application. The anti-aging colored emulsified asphalt mixture provided by the present invention has high strength, is resistant to aging and wear, and retains its surface color without discoloration or whitening. When applied to pavement, the anti-aging colored emulsified asphalt mixture provided by the present invention can meet both the technical requirements of pavement maintenance and the aesthetic requirements of roads.

[0004] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0005] The present invention provides an anti-aging colored emulsified asphalt mixture, which comprises the following raw materials, calculated by weight: 35 to 40 parts of stone, 1 to 2.5 parts of cement, 32 to 38 parts of decolorized-emulsified asphalt, 5 to 8 parts of pigment, 0.3 to 0.5 parts of anti-aging agent and 2 to 3 parts of stabilizer.

[0006] Preferably, the stone material includes basalt and / or diabase; the particle size of the stone material is 0.075-4.75 mm.

[0007] Preferably, the cement is Portland cement.

[0008] Preferably, the raw materials for preparing the decolorized-emulsified asphalt include decolorized asphalt, an emulsifier and water; the mass ratio of the decolorized asphalt, the emulsifier and water is 50-65:4-6:29-46.

[0009] Preferably, the pigment is an inorganic pigment.

[0010] Preferably, the inorganic pigment comprises metal oxides and / or chromates.

[0011] Preferably, the metal oxide includes one or more of iron oxide red, iron oxide yellow, iron oxide brown, chromium oxide green and titanium dioxide white; and the chromate includes at least one of chrome yellow and chrome orange.

[0012] Preferably, the anti-aging agent includes methyl propionate and sodium 2,3-dihydroxynaphthalene-6-sulfonate; the mass ratio of methyl propionate to sodium 2,3-dihydroxynaphthalene-6-sulfonate is 6-8:2-4; and the stabilizer includes hydroxyethyl cellulose and / or sodium carboxymethyl cellulose.

[0013] The present invention provides a method for preparing the anti-aging colored emulsified asphalt mixture described in the above technical solution, comprising the following steps:

[0014] The prepared raw materials are mixed to obtain an anti-aging colored emulsified asphalt mixture.

[0015] The present invention provides the use of the anti-aging colored emulsified asphalt mixture described in the above technical solution or the anti-aging colored emulsified asphalt mixture prepared by the preparation method described in the above technical solution in road and bridge pavement paving.

[0016] The present invention provides an anti-aging colored emulsified asphalt mixture, which comprises the following raw materials in parts by mass: 35-40 parts of stone, 1-2.5 parts of cement, 32-38 parts of bleached-emulsified asphalt, 5-8 parts of pigment, 0.3-0.5 parts of anti-aging agent and 2-3 parts of stabilizer. In the present invention, stone is the skeleton of the anti-aging colored emulsified asphalt mixture, cement is used as filler, bleached-emulsified asphalt is used as binder, the function of the anti-aging agent is to resist oxidation and UV aging, and the stabilizer can improve the storage stability of the bleached-emulsified asphalt. The anti-aging colored emulsified asphalt mixture provided by the present invention has high strength, good flexibility, aging resistance, wear resistance, good road performance, and the surface color is well preserved without discoloration and whitening. When the anti-aging colored emulsified asphalt mixture provided by the present invention is applied to road paving, the construction is convenient and quick, and can meet the road maintenance technology requirements and road aesthetic requirements. The embodiment shows that the wear value of the anti-aging colored emulsified asphalt mixture provided by the present invention is 187g / m 2 The rutting depth deformation rate is 1.18%, and the water stability wear value is 486g / m 2 After accelerated wear, the swing value only dropped by 3BPN, and the surface color was well preserved without discoloration or whitening. After the anti-aging colored emulsified asphalt mixture was placed in a natural environment for aging for one year, its wear value was 204g / m 2 The rutting depth deformation rate is 1.24%, and the water stability wear value is 534g / m 2After accelerated wear, the swing value dropped by only 5BPN, and the surface color was well preserved, with no discoloration or whitening. This shows that the colored asphalt mixture provided by the present invention shows minimal performance degradation after one year of natural aging, with its wear resistance, wheel rutting resistance, and water stability decreasing by no more than 10%. This demonstrates excellent anti-aging properties and a longer service life. DETAILED DESCRIPTION

[0017] The present invention provides an anti-aging colored emulsified asphalt mixture, which comprises the following raw materials, calculated by weight: 35 to 40 parts of stone, 1 to 2.5 parts of cement, 32 to 38 parts of decolorized-emulsified asphalt, 5 to 8 parts of pigment, 0.3 to 0.5 parts of anti-aging agent and 2 to 3 parts of stabilizer.

[0018] In the present invention, unless otherwise specified, the raw materials used are commercially available products well known to those skilled in the art.

[0019] The raw materials used to prepare the aging-resistant colored emulsified asphalt mixture of the present invention include 35-40 parts by weight, preferably 36-38 parts by weight of stone. The stone of the present invention preferably includes basalt and / or diabase, more preferably basalt. The particle size of the stone of the present invention is preferably 0.075-4.75 mm, more preferably 0.225-3.25 mm. In the present invention, the stone serves as the backbone of the aging-resistant colored emulsified asphalt mixture.

[0020] Based on the mass percentage of the stone, the raw materials used to prepare the anti-aging colored emulsified asphalt mixture of the present invention include 1 to 2.5 parts of cement, preferably 1.5 to 2 parts. The cement of the present invention is preferably Portland cement; the strength of the Portland cement is preferably 325#. In the present invention, cement serves as a filler in the anti-aging colored emulsified asphalt mixture and also assists in demulsification.

[0021] Based on the mass fraction of the stone, the raw materials for preparing the anti-aging colored emulsified asphalt mixture of the present invention include 32-38 parts, preferably 34-36 parts, of bleached and emulsified asphalt. In the present invention, the raw materials for preparing the bleached and emulsified asphalt include bleached asphalt, an emulsifier, and water; the mass ratio of the bleached asphalt, emulsifier, and water is preferably 50-65:4-6:29-46, more preferably 55-62:4.5-5.5:35-42. In the present invention, the emulsifier is preferably a cationic slow-cracking, fast-setting emulsifier. The method for preparing the bleached and emulsified asphalt of the present invention preferably includes the following steps: mixing the emulsifier with water to produce a soap solution; heating the bleached asphalt to 160°C and then mixing it with the soap solution to produce a precursor; and shearing the precursor to produce the bleached and emulsified asphalt. After the emulsifier and water are mixed, the pH is preferably adjusted to 2-3, more preferably 2. Hydrochloric acid is preferably used to adjust the pH. The present invention does not specifically limit the method for adjusting the pH value; methods familiar to those skilled in the art can be used. In the present invention, the shearing is preferably performed in an emulsifying shearing machine; the shearing conditions preferably include: a rotational speed of 5000 r / min; and a shearing time of 2 minutes. In the present invention, decolorized-emulsified asphalt is used as a binder for the anti-aging colored emulsified asphalt mixture, thereby improving the strength of the anti-aging colored emulsified asphalt mixture.

[0022] Based on the mass percentage of the stone, the raw materials for preparing the anti-aging colored emulsified asphalt mixture of the present invention include 5-8 parts of pigment, more preferably 6-7 parts. The pigment of the present invention is preferably an inorganic pigment; the inorganic pigment preferably includes a metal oxide and / or a chromate, more preferably a metal oxide or a chromate. In the present invention, the metal oxide preferably includes one or more of iron oxide red, iron oxide yellow, iron oxide brown, chromium oxide green, and titanium dioxide white; the chromate preferably includes at least one of chrome yellow and chrome orange.

[0023] Based on the mass fraction of the stone, the raw materials for preparing the anti-aging colored emulsified asphalt mixture of the present invention include 0.3 to 0.5 parts of anti-aging agent, more preferably 0.35 to 0.45 parts. The anti-aging agent of the present invention preferably includes methyl propionate and sodium 2,3-dihydroxynaphthalene-6-sulfonate; the mass ratio of methyl propionate to sodium 2,3-dihydroxynaphthalene-6-sulfonate is preferably 6 to 8:2 to 4, more preferably 7:3. In the present invention, methyl propionate and sodium 2,3-dihydroxynaphthalene-6-sulfonate are combined to form a composite anti-aging agent, which can simultaneously improve the anti-aging and anti-ultraviolet aging capabilities of the anti-aging colored emulsified asphalt mixture, especially can prevent the main aging modes of the colored asphalt mixture, comprehensively extend the life of the colored asphalt pavement, and better maintain the bright color.

[0024] The raw materials used to prepare the anti-aging colored emulsified asphalt mixture of the present invention include 2-3 parts, more preferably 2.4-2.8 parts, of a stabilizer, based on the mass fraction of the stone. The stabilizer includes hydroxyethyl cellulose and / or sodium carboxymethyl cellulose. In the present invention, the stabilizer can improve the storage stability of the decolorized and emulsified asphalt.

[0025] The present invention also provides a method for preparing the anti-aging colored emulsified asphalt mixture described in the above technical solution, comprising the steps of: mixing the raw materials to obtain the anti-aging colored emulsified asphalt mixture. The present invention has no particular requirements for the mixing method of the raw materials; any mixing method familiar to those skilled in the art can be used.

[0026] The present invention also provides the use of the anti-aging colored emulsified asphalt mixture described in the above technical solution or the anti-aging colored emulsified asphalt mixture prepared by the preparation method described in the above technical solution in road and bridge pavement paving.

[0027] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] Stone (basalt, particle size 0.225-3.25 mm);

[0029] Cement (Portland cement, strength 325#);

[0030] Anti-aging agent (prepared by mixing methyl propionate and sodium 2,3-dihydroxynaphthalene-6-sulfonate in a mass ratio of 7:3);

[0031] Stabilizer (type is sodium carboxymethyl cellulose);

[0032] Emulsifier (cationic slow-cracking fast-setting emulsifier);

[0033] Other reagents used in the examples are all commercially available products.

[0034] Example 1

[0035] Mix 5 kg of emulsifier and 30 kg of water, adjust the pH value to 2, and obtain a soap solution; heat 55 kg of decolorized asphalt to 160° C. and mix with the soap solution to obtain a precursor; place the precursor in an emulsifying shearing machine and shear at a speed of 5000 r / min for 2 minutes to obtain a decolorized-emulsified asphalt.

[0036] 35 kg of decolorized-emulsified asphalt was mixed with 38 kg of stone, 1.5 kg of cement, 6 kg of pigment, 0.5 kg of anti-aging agent and 2 kg of stabilizer to obtain an anti-aging colored emulsified asphalt mixture.

[0037] Comparative Example 1

[0038] Decolorized-emulsified asphalt was prepared according to the preparation method of Example 1.

[0039] 35 kg of decolorized-emulsified asphalt was mixed with 38 kg of stone, 1.5 kg of cement, 6 kg of pigment and 2 kg of stabilizer to obtain a common colored emulsified asphalt mixture.

[0040] The anti-aging colored emulsified asphalt mixture obtained in Example 1 and the ordinary colored emulsified asphalt mixture obtained in Comparative Example 1 were subjected to the JTGE20-2011T0752-2011 slurry mixture wet wheel abrasion test, the T0756-2011 slurry mixture rutting deformation test, and the JTGE60-2008T0964-2008 pendulum instrument test method for measuring the pavement friction coefficient. The test results are shown in Table 1:

[0041] Table 1 Performance test results of the anti-aging colored emulsified asphalt mixture obtained in Example 1 and the ordinary colored emulsified asphalt mixture obtained in Comparative Example 1

[0042]

[0043] The test results show that the wear value of the anti-aging colored emulsified asphalt mixture obtained in Example 1 is 187g / m 2 The rutting depth deformation rate is 1.18%, and the water stability wear value is 486g / m 2 After accelerated wear, the swing value only dropped by 3BPN, and the surface color was well preserved without discoloration or whitening. After the anti-aging colored emulsified asphalt mixture obtained in Example 1 was placed in a natural environment for aging for one year, its wear value was 204g / m 2 The rutting depth deformation rate is 1.24%, and the water stability wear value is 534g / m 2 After accelerated wear, the swing value dropped by only 5BPN, and the surface color was well preserved, with no discoloration or whitening. This shows that the colored asphalt mixture provided by the present invention shows minimal performance degradation after one year of natural aging, with its wear resistance, wheel rutting resistance, and water stability attenuating by no more than 10%. It has excellent anti-aging properties and a longer service life, surpassing conventional colored emulsified asphalt mixtures.

[0044] Although the above embodiment provides a detailed description of the present invention, it is only a part of the embodiments of the present invention, not all of the embodiments. People can also obtain other embodiments based on this embodiment without creativity, and these embodiments all fall within the scope of protection of the present invention.

Claims

1. An anti-aging colored emulsified asphalt mixture, which is prepared from the following raw materials in parts by mass: 38 parts of stone, 1.5 parts of cement, 35 parts of bleached-emulsified asphalt, 6 parts of pigment, 0.5 parts of anti-aging agent and 2 parts of stabilizer. The raw materials for preparing the bleached-emulsified asphalt are specifically bleached asphalt, emulsifier and water; the mass ratio of the bleached asphalt, emulsifier and water is 55:5:30, the emulsifier is a cationic slow-cracking and fast-setting emulsifier, the anti-aging agent is specifically methyl propionate and sodium 2,3-dihydroxynaphthalene-6-sulfonate, and the mass ratio of methyl propionate to sodium 2,3-dihydroxynaphthalene-6-sulfonate is 7:

3.

2. The anti-aging colored emulsified asphalt mixture according to claim 1, characterized in that: The stone material includes basalt and / or diabase; the particle size of the stone material is 0.075-4.75 mm.

3. The anti-aging colored emulsified asphalt mixture according to claim 1, characterized in that: The cement is Portland cement.

4. The anti-aging colored emulsified asphalt mixture according to claim 1, characterized in that: The pigment is an inorganic pigment.

5. The anti-aging colored emulsified asphalt mixture according to claim 4, characterized in that: The inorganic pigments include metal oxides and / or chromates.

6. The anti-aging colored emulsified asphalt mixture according to claim 5, characterized in that: The metal oxide includes one or more of iron oxide red, iron oxide yellow, iron oxide brown, chromium oxide green and titanium dioxide white; the chromate includes at least one of chrome yellow and chrome orange.

7. The anti-aging colored emulsified asphalt mixture according to claim 1, characterized in that: The stabilizer includes hydroxyethyl cellulose and / or sodium carboxymethyl cellulose.

8. The method for preparing the anti-aging colored emulsified asphalt mixture according to any one of claims 1 to 7, comprising the following steps: The prepared raw materials are mixed to obtain an anti-aging colored emulsified asphalt mixture.

9. Use of the anti-aging colored emulsified asphalt mixture according to any one of claims 1 to 7 or the anti-aging colored emulsified asphalt mixture prepared by the preparation method according to claim 8 in road and bridge pavement construction.

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