SMA asphalt pavement modified hydrophobic material and preparation method and application thereof

Abstract

The present application relates to the technical field of steel slag surface modification, and provides SMA asphalt pavement modified hydrophobic material, a preparation method and application thereof, the modified hydrophobic material comprises component 1 and component 2; the component 1 comprises distilled water, methyl potassium silicate solution, anionic emulsified asphalt, polydimethylsiloxane, methyl silicone oil and bis-hexadecyl phosphate; the component 2 comprises an ethanol aqueous solution, polyacrylate emulsion and methacryloyloxy silane; the preparation method is to prepare the component 1 and the component 2 and mix them to obtain the modified hydrophobic material; the modified hydrophobic material is applied to treat steel slag; the method for treating steel slag is to select steel slag coarse aggregate, place the steel slag coarse aggregate in the modified hydrophobic material to prepare hydrophobic steel slag. The preparation process of the modified hydrophobic material is simple and operable, the requirements for site and equipment are low, the material is environmentally friendly and easy to obtain, the water absorption and immersion expansion rate of the steel slag can be reduced, and the expansion of the steel slag aggregate itself is inhibited.

Description

Technical Field

[0001] The present invention relates to the technical field of steel slag surface modification, and in particular to an SMA asphalt pavement modified hydrophobic material, a preparation method and application thereof. Background Art

[0002] The rapid development of transportation construction has driven economic growth. my country's total highway mileage and network density have been steadily increasing in recent years. This large-scale expansion of highway construction has accelerated China's economy and brought significant convenience to people's lives and work. Asphalt mixture, as the primary type of road construction material, has been widely used in the construction and renovation of highway pavements. Unlike traditional basalt and limestone gravel used for roads, steel slag has a rough and porous surface after the smelting process, making it highly adsorbable to liquid substances. Furthermore, steel slag contains highly hydration-active components such as f-CaO and f-MgO. Without appropriate surface modification pretreatment, the various metal oxide components within the slag are susceptible to hydration reactions during pavement service, forming a variety of hydration products and causing swelling, which can cause irreparable damage to the pavement structure. Furthermore, after erosion by rainwater, heavy metal ions within the slag can seep into the surrounding soil with runoff, endangering local water resources and the natural environment.

[0003] To promote the use of steel slag in pavement materials, the primary challenge is to address its surface waterproofing. Natural aging is commonly used in engineering applications to fully hydrate the f-CaO in the slag. These processes primarily involve soaking and spraying in a solar-exposed cycle. However, these methods are time-consuming and require significant storage space, significantly hindering the resourceful utilization of the slag.

[0004] Therefore, in order to solve the above problems, an SMA asphalt pavement modified hydrophobic material and a preparation method and application thereof are proposed. Summary of the Invention

[0005] In response to the deficiencies in the prior art, the present invention develops an SMA asphalt pavement modified hydrophobic material, a preparation method, and an application thereof. The present invention uses a hydrophobic material to modify steel slag. The preparation process is simple and operable, with low requirements for site and equipment. The materials are environmentally friendly and readily available. The produced SMA steel slag asphalt mixture has good water stability.

[0006] The technical solution for solving the technical problem of the present invention is as follows: the present invention provides an SMA asphalt pavement modified hydrophobic material, the modified hydrophobic material including component 1 and component 2, and in parts by weight, component 1 includes: 260-300 parts of distilled water, 240-280 parts of potassium methyl silicate solution, 15-20 parts of anionic emulsified asphalt, 3-5 parts of polydimethylsiloxane, 2-4 parts of methyl silicone oil and 10-16 parts of dihexadecyl phosphate; component 2 includes: 100-120 parts of ethanol aqueous solution, 34-40 parts of polyacrylate emulsion and 20-24 parts of methacryloxysilane.

[0007] Specifically, the solid content of the potassium methyl silicate solution is 40% to 45% by mass; wherein the preparation method of the potassium methyl silicate is: hydrolyzing methyltrichlorosilane and dimethyldichlorosilane in water, and then mixing with a KOH aqueous solution to prepare potassium methyl silicate:

[0008] .

[0009] Specifically, potassium methyl silicate is polymerized into polymethylsiloxane in water and carbon dioxide, and the reaction formula is:

[0010] .

[0011] A method for preparing the SMA asphalt pavement modified hydrophobic material according to any one of the above items, comprising the following steps:

[0012] S1. Add potassium methyl silicate solution, anionic emulsified asphalt, polydimethylsiloxane, methyl silicone oil and dicetyl phosphate to distilled water in parts by weight and stir to prepare component 1;

[0013] S2, adding polyacrylate emulsion and methacryloxysilane to ethanol aqueous solution in parts by weight, stirring to prepare component 2;

[0014] S3. Add component 2 to component 1 and stir to obtain a modified hydrophobic material.

[0015] Specifically, in S1, the stirring speed is 1000 rpm and the stirring time is 25 min; in S2, the stirring speed is 800 rpm and the stirring time is 10 min; in S3, the stirring speed is 300 rpm and the stirring time is 10 min.

[0016] An application of the SMA asphalt pavement modified hydrophobic material prepared according to the above preparation method, wherein the modified hydrophobic material is used to treat steel slag, and the following steps are used to treat the steel slag:

[0017] S1. Select the coarse aggregate of steel slag, clean the dust on the surface and then put it into the oven to dry to constant weight;

[0018] S2, the dried steel slag coarse aggregate is soaked in the modified hydrophobic material, and after being fished out, the steel slag coarse aggregate is coagulated and solidified at room temperature, and the solidified steel slag coarse aggregate is kept warm to obtain the hydrophobic steel slag.

[0019] Specifically, in S1, the steel slag coarse aggregate is obtained by screening the steel slag through a 2.36 mm sieve.

[0020] Specifically, in S2, the steel slag coarse aggregate is soaked in the modified hydrophobic material for 12 h, and after being fished out, the steel slag coarse aggregate is coagulated and solidified at room temperature for 1 d, and the solidified steel slag coarse aggregate is kept warm in an oven at 100℃±5℃ for 2 h to obtain the hydrophobic steel slag.

[0021] The effects provided in the summary are only the effects of the embodiments, not all the effects of the application, and the above technical solutions have the following advantages or beneficial effects:

[0022] 1. The modified hydrophobic material provided by the application can effectively isolate the active ingredients in the steel slag from water, reduce the water absorption and water immersion expansion rate of the steel slag, and inhibit the expansion of the steel slag aggregate itself.

[0023] 2. The modified hydrophobic material provided by the application can enhance the adhesion of asphalt and aggregate, increase the adhesion work of asphalt and steel slag, reduce the peeling work, and improve the water damage resistance of asphalt mixture.

[0024] 3. The hydrophobic steel slag obtained by modifying the steel slag aggregate can still maintain the roughness of its surface and maintain its original strength.

[0025] 4. The components used in the modified hydrophobic material are environmentally friendly and easy to obtain, and the preparation does not require special equipment, has low cost, simple production process, and realizes the reuse of waste resources. DETAILED DESCRIPTION

[0026] In order to clearly illustrate the technical features of the present application, the following will describe the present application in detail through specific embodiments. The following disclosure provides many different embodiments or examples to implement the different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. In addition, the present application can repeatedly refer to numerals and / or letters in different examples. Such repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and / or settings discussed.

[0027] A modified hydrophobic material for an SMA asphalt pavement comprises a component 1 and a component 2. Component 1 comprises, by weight, 260-300 parts of distilled water, 240-280 parts of potassium methyl silicate solution, 15-20 parts of anionic emulsified asphalt, 3-5 parts of polydimethylsiloxane, 2-4 parts of methyl silicone oil, and 10-16 parts of dicetyl phosphate; and component 2 comprises 100-120 parts of an ethanol aqueous solution, 34-40 parts of a polyacrylate emulsion, and 20-24 parts of methacryloxysilane.

[0028] The potassium methyl silicate solution has a solid content of 40% to 45% by mass. The potassium methyl silicate is prepared by hydrolyzing methyltrichlorosilane and dimethyldichlorosilane in water and then mixing with a KOH aqueous solution to obtain the potassium methyl silicate:

[0029] .

[0030] Potassium methyl silicate polymerizes into polymethylsiloxane in water and carbon dioxide, and the reaction formula is:

[0031] .

[0032] Among them, polydimethylsiloxane is a catalyst; methyl silicone oil is a defoaming agent; and dicetyl phosphate is a membrane aid that accelerates the dissolution and plasticizes the polymer.

[0033] The volume ratio of anhydrous ethanol to water in the ethanol aqueous solution is 20:1.

[0034] The film forming mechanism is:

[0035] .

[0036] A method for preparing the SMA asphalt pavement modified hydrophobic material according to any one of the above items, comprising the following steps:

[0037] S1. Add potassium methyl silicate solution, anionic emulsified asphalt, polydimethylsiloxane, methyl silicone oil and dicetyl phosphate to distilled water in parts by weight and stir to prepare component 1;

[0038] S2, adding polyacrylate emulsion and methacryloxysilane to ethanol aqueous solution in parts by weight, stirring to prepare component 2;

[0039] S3. Add component 2 to component 1 and stir to obtain a modified hydrophobic material.

[0040] In S1, the stirring speed is 1000 rpm and the stirring time is 25 min; in S2, the stirring speed is 800 rpm and the stirring time is 10 min; in S3, the stirring speed is 300 rpm and the stirring time is 10 min.

[0041] An application of the SMA asphalt pavement modified hydrophobic material prepared according to the above preparation method, wherein the modified hydrophobic material is used to treat steel slag, and the following steps are used to treat the steel slag:

[0042] S1. Select the coarse aggregate of steel slag, clean the dust on the surface and then put it into the oven to dry to constant weight;

[0043] S2. Soaking the steel slag coarse aggregate in a modified hydrophobic material, taking it out and solidifying it at room temperature, and keeping the solidified steel slag coarse aggregate warm to obtain hydrophobic steel slag.

[0044] In S1, the steel slag coarse aggregate is obtained by screening the steel slag through a 2.36 mm sieve.

[0045] In S2, the steel slag coarse aggregate is soaked in the modified hydrophobic material for 12 hours, and then taken out and solidified at room temperature for 1 day. The solidified steel slag coarse aggregate is kept in an oven at 100℃±5℃ for 2 hours to obtain hydrophobic steel slag.

[0046] Example 1:

[0047] 240 parts by weight of potassium methyl silicate solution, 15 parts by weight of anionic emulsified asphalt, 3 parts by weight of polydimethylsiloxane, 2 parts by weight of methyl silicone oil, and 10 parts by weight of dicetyl phosphate were added to a beaker containing 260 parts by weight of distilled water, and the mixture was rapidly stirred at 1000 rpm for 25 minutes to prepare component 1;

[0048] 34 parts by weight of polyacrylate emulsion and 20 parts by weight of methacryloxysilane were weighed and added to a beaker containing 100 parts by weight of an alcohol aqueous solution, and the mixture was rapidly stirred at 800 rpm for 10 minutes to prepare component 2;

[0049] Add the prepared component 2 to component 1 and stir at 300 rpm for 10 min to obtain a composite modified hydrophobic material;

[0050] The steel slag was passed through a 2.36 mm sieve to select the coarse aggregate, and the surface dust was cleaned and then placed in an oven to dry to constant weight;

[0051] The dried steel slag coarse aggregate was immersed in a composite modified hydrophobic material for 12 hours, taken out and solidified at room temperature for 1 day, and then placed in an oven at 100℃±5℃ for 2 hours to obtain hydrophobic steel slag I;

[0052] The 10 parts by weight of SBS modified asphalt is heated to a molten flow state, and the temperature is controlled to be 165-175℃, 110 parts by weight of hydrophobic steel slag I, 20 parts by weight of machine-made sand, 6 parts by weight of unmodified steel slag ball mill powder, and 14 parts by weight of mineral powder are added into the molten flow asphalt, and uniformly stirred to obtain the mixture, the water absorption of the mixture is 1.21%, the crushing value is 11.6%, the abrasion value is 14.2%, the water immersion expansion rate is 1.26%, the surface energy is 31.12 , and the adhesion work is 103.35 .

[0053] Example 2:

[0054] Take 280 parts by weight of methyl potassium silicate solution, 20 parts by weight of anionic emulsified asphalt, 5 parts by weight of polydimethylsiloxane, 4 parts by weight of methyl silicone oil and 16 parts by weight of bis-hexadecyl phosphate into a beaker containing 300 parts by weight of distilled water, and stir rapidly at a speed of 1000 rpm for 25 min to prepare component 1;

[0055] Take 40 parts by weight of polyacrylate emulsion and 24 parts by weight of methacryloyloxy silane into a beaker containing 110 parts by weight of alcohol aqueous solution, and stir rapidly at a speed of 800 rpm for 10 min to prepare component 2;

[0056] Add the prepared component 2 into component 1, and stir at a speed of 300 rpm for 10 min to obtain the composite modified hydrophobic material;

[0057] The steel slag is selected by a 2.36 mm sieve, and after cleaning the surface dust, it is put into an oven and dried to constant weight for 2 h;

[0058] The dried steel slag coarse aggregate is soaked in the composite modified hydrophobic material for 12 h, taken out and coagulated and solidified at room temperature for 1 d, and then placed in an oven at 100℃±5℃ for 2 h to obtain the hydrophobic steel slag II;

[0059] The 10 parts by weight of SBS modified asphalt is heated to a molten flow state, and the temperature is controlled to be 165-175℃, 110 parts by weight of hydrophobic steel slag I, 20 parts by weight of machine-made sand, 6 parts by weight of unmodified steel slag ball mill powder, and 14 parts by weight of mineral powder are added into the molten flow asphalt, and uniformly stirred to obtain the mixture, the water absorption of the mixture is 1.21%, the crushing value is 11.6%, the abrasion value is 14.2%, the water immersion expansion rate is 1.26%, the surface energy is 31.12 , and the adhesion work is 103.35 .

[0060] Comparative Example 1:

[0061] The steel slag was passed through a 2.36 mm sieve to select the coarse aggregate. After cleaning the dust on the surface, it was placed in an oven and dried for 2 hours to constant weight. The dried coarse aggregate was modified with modified material I. The composition analysis of modified material I is shown in Table 1:

[0062] Table 1:

[0063]

[0064] The steel slag was immersed in the comparative modified material I for 12 hours, taken out and solidified at room temperature for 1 day, and then placed in an oven at 100℃±5℃ for 2 hours to obtain hydrophobic steel slag III;

[0065] 10 parts by weight of SBS modified asphalt was heated to a molten flow state, and the addition temperature was controlled at 165-175°C. 110 parts by weight of hydrophobic steel slag III, 20 parts by weight of machine-made sand, 6 parts by weight of unmodified steel slag ball-milled powder, and 14 parts by weight of mineral powder were added to the molten flow asphalt and uniformly stirred to obtain a mixture. The mixture had a water absorption rate of 1.38%, a crushing value of 13.6%, a wear value of 15.1%, a water expansion rate of 1.49%, and a surface energy of 29.50. , the adhesion work is 101.55 .

[0066] Comparative Example 2:

[0067] The steel slag was passed through a 2.36 mm sieve to select the coarse aggregate, and the surface dust was cleaned and then placed in an oven to dry for 2 hours to constant weight;

[0068] The dried coarse aggregate of steel slag was surface-modified with silicone resin modified material II containing 4% of the mass of the dried coarse aggregate of steel slag. The dried coarse aggregate of steel slag was immersed in modified material II for 12 hours, then removed and solidified at room temperature for 1 day, and then kept in an oven at 100℃±5℃ for 2 hours to obtain hydrophobic steel slag IV.

[0069] 10 parts by weight of SBS modified asphalt was heated to a molten flow state, and the addition temperature was controlled at 165-175°C. 110 parts by weight of hydrophobic steel slag IV, 20 parts by weight of machine-made sand, 6 parts by weight of unmodified steel slag ball-milled powder, and 14 parts by weight of mineral powder were added to the molten flow asphalt and uniformly stirred to obtain a mixture. The mixture had a water absorption rate of 1.33%, a crushing value of 13.8%, a wear value of 15.9%, a water expansion rate of 1.51%, and a surface energy of 28.89. , the adhesion work is 100.03 .

[0070] Although the above describes the specific implementation methods of the invention, it does not limit the scope of protection of the invention. Based on the technical solution of the present invention, various modifications or variations that can be made by those skilled in the art without creative work are still within the scope of protection of the present invention.

Claims

1. A SMA asphalt pavement modified hydrophobic material, characterized by: The modified hydrophobic material includes component 1 and component 2. Component 1 includes, by weight, 260 to 300 parts of distilled water, 240 to 280 parts of potassium methyl silicate solution, 15 to 20 parts of anionic emulsified asphalt, 3 to 5 parts of polydimethylsiloxane, 2 to 4 parts of methyl silicone oil, and 10 to 16 parts of dicetyl phosphate; component 2 includes 100 to 120 parts of ethanol aqueous solution, 34 to 40 parts of polyacrylate emulsion, and 20 to 24 parts of methacryloxysilane. The potassium methyl silicate solution has a solid content of 40% to 45% by mass. The potassium methyl silicate is prepared by hydrolyzing methyltrichlorosilane and dimethyldichlorosilane in water and then mixing with a KOH aqueous solution to obtain the potassium methyl silicate: 。 2. The SMA asphalt pavement modified hydrophobic material according to claim 1, characterized in that: Potassium methyl silicate polymerizes into polymethylsiloxane in water and carbon dioxide, and the reaction formula is: 。 3. A method for preparing the SMA asphalt pavement modified hydrophobic material according to any one of claims 1 to 2, characterized in that: Use the following steps, S1. Add potassium methyl silicate solution, anionic emulsified asphalt, polydimethylsiloxane, methyl silicone oil and dicetyl phosphate to distilled water in parts by weight and stir to prepare component 1. The stirring speed is 1000 rpm and the stirring time is 25 min. S2. Add polyacrylate emulsion and methacryloxysilane to ethanol aqueous solution in parts by weight and stir to obtain component 2. The stirring speed is 800 rpm and the stirring time is 10 min. S3. Add component 2 to component 1 and stir to obtain a modified hydrophobic material. The stirring speed is 300 rpm and the stirring time is 10 min.

4. An application of the SMA asphalt pavement modified hydrophobic material prepared by the preparation method according to claim 3, characterized in that: The modified hydrophobic material is used to treat steel slag. The following steps are used to treat steel slag: S1. Select the coarse aggregate of steel slag, clean the dust on the surface and then put it into the oven to dry to constant weight; S2. Soaking the dried steel slag coarse aggregate in a modified hydrophobic material, taking it out and solidifying it at room temperature, and keeping the solidified steel slag coarse aggregate warm to obtain hydrophobic steel slag.

5. The application of the SMA asphalt pavement modified hydrophobic material prepared according to claim 4 is characterized by: In S1, the steel slag coarse aggregate is obtained by screening the steel slag through a 2.36 mm sieve.

6. The use of the SMA asphalt pavement modified hydrophobic material prepared according to claim 4, characterized in that: in S2, the steel slag coarse aggregate is soaked in the modified hydrophobic material for 12 hours, removed and solidified at room temperature for 1 day, and the solidified steel slag coarse aggregate is kept in an oven at 100°C ± 5°C for 2 hours to obtain hydrophobic steel slag.

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