Salt storage type asphalt pavement additive and preparation method thereof

Abstract

The invention discloses a salt storage type asphalt pavement additive and a preparation method thereof, and relates to the technical field of asphalt pavements, the raw materials comprise sodium chloride, silicate, asphalt, a polymer, and a surfactant, and the mass fraction of each component is 1-5; 10 to 20 parts of sodium chloride; 10 to 20 parts of silicate; 5 to 10 parts of asphalt; 25 to 35 parts of polymer; 10 to 30 parts of a surfactant; therefore, 15 parts of sodium chloride is selected; 15 parts of silicate is selected, the silicate is ordinary Portland cement, and the mark number is P.O 52.5; 7.5 parts of asphalt is selected; 30 parts of polymer is selected and is phenolic resin, and the phenolic resin is mixed with absolute ethyl alcohol to be used as a wrapping material; 20 parts of a surfactant, namely span-80, is selected. According to the salt storage type asphalt pavement additive and the preparation method thereof, sodium chloride can be well adsorbed through the diatomite, sodium chloride is well crystallized, the loading capacity of sodium chloride in the diatomite is high, and the sodium chloride is combined with a polymer solution, so that the snow melting effect can be fully played.

Description

Technical Field

[0001] The invention relates to the technical field of asphalt pavement, and in particular to a salt-storage type asphalt pavement additive and a preparation method thereof. Background Art

[0002] Traditional methods of inhibiting road icing and removing ice and snow have shortcomings such as poor effect and environmental pollution. To this end, researchers have developed salt-storage asphalt pavement additives, which include a core material and a wrapping material coated on the surface of the core material. The core material includes deicing salt and a salt storage carrier loaded with deicing salt. The wrapping material is composed of a mixture of phenolic resin and anhydrous ethanol. These studies provide a new direction for the development of environmentally friendly anti-icing technology.

[0003] For example, the Chinese patent with publication number CN117987085A discloses a salt-storage asphalt pavement additive and its preparation method and asphalt pavement, which belong to the technical field of asphalt pavement. The salt-storage asphalt pavement additive includes a core material and a wrapping material coated on the surface of the core material; the core material includes snow-melting salt and a salt-storage carrier loaded with snow-melting salt; the wrapping material includes a mixture of phenolic resin and anhydrous ethanol. The salt-storage asphalt pavement additive can carry more sodium chloride, and the material has good sustained release ability and long-term effect. The preparation method of the salt-storage asphalt pavement additive includes: coating the wrapping material on the surface of the core material and curing. The method is simple, easy to operate, and can be industrialized. The above-mentioned salt-storage asphalt pavement additive can be used to add to the materials for preparing asphalt pavement, so that the pavement itself can have a better effect of melting ice and snow, avoiding the cost of large manpower and material resources for snow and ice removal.

[0004] The existing technology has the following problems:

[0005] In the current preparation project of salt-storage asphalt pavement additives, the volatilization and efficiency of snow melting are slow. At the same time, the additives in the preparation process lack uniform distribution and have low bonding strength with asphalt. At the same time, the bonding strength between the slow-release sodium chloride material and the asphalt material is not high. Therefore, it is necessary to fully modify them, which is not easy to improve the performance of the additives. Summary of the invention

[0006] The present invention provides a salt storage type asphalt pavement additive and a preparation method thereof to solve the problems raised in the above background technology.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0008] A salt storage type asphalt pavement additive, the raw materials include sodium chloride, silicate, asphalt, polymer, surfactant, and the mass fraction of each component is;

[0009] Sodium chloride: 10-20 parts;

[0010] Silicate: 10-20 parts;

[0011] Asphalt: 5-10 parts;

[0012] Polymer: 25-35 parts;

[0013] Surfactant: 10-30 parts;

[0014] Preferably, choose:

[0015] Sodium chloride: select 15 parts;

[0016] Silicate: 15 parts of ordinary Portland cement, with the label PO 52.5;

[0017] Asphalt: 7.5 parts;

[0018] Polymer: 30 parts of phenolic resin are selected, which is mixed with anhydrous ethanol and used as a wrapping material;

[0019] Surfactant: 20 parts of span-80 were selected.

[0020] A method for preparing a salt-storage type asphalt pavement additive comprises the following steps:

[0021] S1: core material preparation;

[0022] S2: Wrapping material selection and preparation;

[0023] S3: Core material coating and curing;

[0024] S4: Crushing and packaging.

[0025] Preferably, in step S1, an appropriate amount of sodium chloride is dissolved in water to form a saturated solution, and the ratio of the solute to the solvent can be adjusted according to the required concentration, and the silicate is slowly added to the sodium chloride solution and stirred until it is completely dissolved.

[0026] Preferably, in step S1, sodium chloride is mixed with diatomaceous earth and processed by a specific production process (such as vacuum impregnation-decompression evaporation process or wet surface modification process) to form a filler or aggregate with salt storage and anti-icing functions, thereby forming a mixture.

[0027] Preferably, in step S2, a pre-dissolved polymer solution (such as polyacrylamide aqueous solution, styrene-butadiene-styrene) is slowly added to the mixture, and stirring is continued. The mixture is used as a wrapping material. This step can improve the flexibility and durability of the material.

[0028] Preferably, at the same time in step S2, the asphalt is heated to its fluid state (usually 160-180° C.), and then slowly added to the above mixture to ensure that the asphalt is evenly combined with the mixture;

[0029] After the bitumen is added, the surfactant is added to the mixture and stirring is continued to ensure that all ingredients are evenly dispersed in the bitumen.

[0030] Preferably, in step S3, the mixture is cooled to room temperature and then cured; during the curing, the temperature is 140-160° C. for 30-50 min;

[0031] After step S3, in step S4, the solidified material is appropriately crushed and packaged.

[0032] Preferably, surfactants (anionic surfactants, cationic surfactants, nonionic surfactants, zwitterionic surfactants) are sequentially added and stirred.

[0033] Due to the adoption of the above technical solution, the present invention has the following technical advances compared with the prior art:

[0034] 1. The present invention provides a salt-storage asphalt pavement additive and a preparation method thereof. Diatomaceous earth can better absorb sodium chloride and the sodium chloride crystallizes well. The loading amount of sodium chloride in the above-mentioned diatomaceous earth is relatively high. When combined with a polymer solution, it is more conducive to fully exerting the snow melting effect.

[0035] 2. The present invention provides a salt-storage asphalt pavement additive and a preparation method thereof. By adding a small amount of asphalt in the core material, the salt-storage asphalt pavement additive is formed, which is more mixed with the materials of the salt-storage asphalt pavement, thereby improving the dispersion of the pavement and the snow melting efficiency.

[0036] 3. The present invention provides a salt-storage asphalt pavement additive and a preparation method thereof. By adding four different surfactants in sequence, the additive can provide good wetting and dispersing effects in the asphalt mixture, which helps to evenly distribute the salt-storage components in the asphalt, helps to enhance the bonding strength between the additive and the asphalt and mineral materials, and improves the performance of the additive. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the core material structure of the salt storage type asphalt pavement additive raw material of the present invention;

[0038] Figure 2 It is a structural schematic diagram of the preparation method of the salt-storage asphalt pavement additive of the present invention. DETAILED DESCRIPTION

[0039] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0040] like Figure 1 As shown, a salt storage type asphalt pavement additive and a preparation method thereof, the raw materials include sodium chloride, silicate, asphalt, polymer, surfactant, and the mass fraction of each component is;

[0041] Sodium chloride: 10-20 parts;

[0042] Silicate: 10-20 parts;

[0043] Asphalt: 5-10 parts;

[0044] Polymer: 25-35 parts;

[0045] Surfactant: 10-30 parts;

[0046] So choose:

[0047] Sodium chloride: select 15 parts;

[0048] Silicate: 15 parts of ordinary Portland cement, with the label PO 52.5;

[0049] Asphalt: 7.5 parts;

[0050] Polymer: 30 parts of phenolic resin are selected, which is mixed with anhydrous ethanol and used as a wrapping material;

[0051] Surfactant: 20 parts of span-80 were selected.

[0052] Comparative Example 1: Sodium chloride content is too high

[0053] Sodium chloride: 25 parts (increase by 5 parts)

[0054] Silicate: 15 parts

[0055] Asphalt: 7.5 parts

[0056] Polymer: 30 parts Surfactant: 20 parts Comparative Example 2: Silicate content is too low Sodium chloride: 15 parts Silicate: 5 parts (reduced by 10 parts) Asphalt: 7.5 parts

[0057] Polymer: 30 parts Surfactant: 20 parts Comparative Example 3: Asphalt content is too high Sodium chloride: 15 parts

[0058] Silicate: 15 parts Asphalt: 15 parts (7.5 parts more) Polymer: 30 parts Surfactant: 20 parts Comparative Example 4: Polymer content is too low Sodium chloride: 15 parts

[0059] Silicate: 15 parts

[0060] Asphalt: 7.5 parts Polymer: 15 parts (reduce 15 parts) Surfactant: 20 parts Comparative Example 5: Surfactant content is too low Sodium chloride: 15 parts

[0061] Silicate: 15 parts

[0062] Asphalt: 7.5 parts

[0063] Polymer: 30 parts

[0064] Surfactant: 5 parts (reduce 15 parts)

[0065] Embodiment 1 (optimum ratio):

[0066] Sodium chloride: 15 parts

[0067] Silicate: 15 parts

[0068] Asphalt: 7.5 parts

[0069] Polymer: 30 parts

[0070] Surfactant: 20 parts

[0071] Sodium Chloride: The right amount of sodium chloride can provide good antifreeze effect without placing too much burden on the material structure.

[0072] Silicates: Enhance the structural strength and durability of materials.

[0073] Asphalt: The right amount of asphalt can ensure the adhesion and fluidity of the material.

[0074] Polymer: Sufficient polymer increases the flexibility and durability of the material.

[0075] Surfactant: Ensures uniform dispersion of ingredients.

[0076] Comparative results prediction:

[0077] Comparative Example 1 (sodium chloride is too high): may cause the material to be too brittle and affect durability.

[0078] Comparative Example 2 (too low silicate content): The structural strength of the material may be insufficient and cracks may occur easily.

[0079] Comparative Example 3 (too high asphalt): may cause the material to be too viscous, affecting construction and final performance.

[0080] Comparative Example 4 (Polymer Too Low): The flexibility and durability of the material may be insufficient.

[0081] Comparative Example 5 (too low surfactant): The components may be unevenly dispersed, affecting the overall performance

[0082] like Figure 2 As shown, the following steps are included:

[0083] S1: core material preparation;

[0084] S2: Wrapping material selection and preparation;

[0085] S3: Core material coating and curing;

[0086] S4: Crushing and packaging.

[0087] like Figure 2 As shown, step S1 is to dissolve an appropriate amount of sodium chloride in water to form a saturated solution. The ratio of solute and solvent can be adjusted according to the required concentration. Silicate is slowly added to the sodium chloride solution and stirred until it is completely dissolved. This step can enhance the structural strength and durability of the material.

[0088] For example, when preparing a saturated solution of sodium chloride, the main basis for adjusting the ratio of solute (sodium chloride) and solvent (water) is the solubility of sodium chloride at the current temperature; solubility refers to the mass of solute dissolved in 100 grams of solvent when a solid substance reaches a saturated state at a certain temperature; for sodium chloride, its solubility in water increases with increasing temperature; therefore, when you want to prepare a sodium chloride solution of a specific concentration (including a saturated solution), you need to refer to the solubility data of sodium chloride at that temperature; for example, at room temperature (about 20°C), the solubility of sodium chloride is a relatively fixed value, and you can use this value to calculate the required ratio of sodium chloride and water to prepare a solution close to saturation or a specific concentration.

[0089] like Figure 2 As shown, in step S1, sodium chloride is mixed with diatomaceous earth and processed through a specific production process (such as vacuum impregnation-decompression evaporation process or wet surface modification process) to form a filler or aggregate with salt storage and anti-icing functions, thereby forming a mixture.

[0090] Ensure that the impregnation sample formed above is in a vacuum kettle of the vacuum impregnation device, is well sealed, and is connected to a vacuum pump and necessary auxiliary equipment. Turn on the vacuum pump and evacuate the device. According to the experimental requirements, the vacuum degree needs to reach a certain level (e.g., 10 -7 Torr or more), remove air and moisture from the sample and improve the impregnation effect.

[0091] like Figure 2 As shown, in step S2, the polyacrylamide aqueous solution and the pre-dissolved polymer solution are slowly added to the mixture, and stirring is continued. The mixture is used as a wrapping material. This step can improve the flexibility and durability of the material.

[0092] like Figure 2As shown, at the same time, in step S2, the asphalt is heated to its fluid state (usually 160-180° C.), and then slowly added to the above mixture to ensure that the asphalt is evenly combined with the mixture;

[0093] After the bitumen is added, the surfactant is added to the mixture and stirring is continued to ensure that all ingredients are evenly dispersed in the bitumen.

[0094] like Figure 2 As shown, in step S3, the mixture is cooled to room temperature and then cured; during the curing, the temperature is 140-160° C. for 30-50 minutes;

[0095] After step S3, in step S4, the solidified material may need to be appropriately crushed and packaged for easy transportation and use.

[0096] like Figure 2 As shown, surfactants (anionic surfactant, cationic surfactant, nonionic surfactant, zwitterionic surfactant) are sequentially added and stirred;

[0097] Four types of surfactants were installed in a 1:1 distribution and 20 copies were selected.

[0098] The working principle of the present invention is as follows: a proper amount of sodium chloride is dissolved in water to form a saturated solution, the ratio of solute to solvent can be adjusted according to the required concentration, silicate is slowly added to the sodium chloride solution, stirred until completely dissolved, the sodium chloride is mixed with diatomaceous earth, and processed through a specific production process to form a filler or aggregate with salt storage and anti-icing functions; a pre-dissolved polymer solution wrapping material is added to the mixture, and stirring is continued, and the mixture is used as a wrapping material; asphalt is heated to its flow state (usually 160-180°C), and then slowly added to the above mixture to ensure that the asphalt is evenly combined with the mixture, after the asphalt is added, a surfactant is added to the mixture, and stirring is continued to ensure that all components are evenly dispersed in the asphalt; the mixture is cooled to room temperature and then solidified; the solidification is carried out at 140-160°C for 30-50min; after step S3, in step S4, the solidified material may need to be properly crushed and packaged for easy transportation and use.

[0099] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A salt storage type asphalt pavement additive, characterized in that: The raw materials include sodium chloride, silicate, asphalt, polymer, and surfactant, and the mass fraction of each component is; Sodium chloride: 10-20 parts; Silicate: 10-20 parts; Asphalt: 5-10 parts; Polymer: 25-35 parts; Surfactant: 10-30 parts.

2. The salt-storage asphalt pavement additive according to claim 1, characterized in that: So choose: Sodium chloride: select 15 parts; Silicate: 15 parts of ordinary Portland cement, with the label PO 52.5; Asphalt: 7.5 parts; Polymer: 30 parts of phenolic resin are selected, which is mixed with anhydrous ethanol and used as a wrapping material; Surfactant: 20 parts of span-80 were selected.

3. A method for preparing a salt-storage type asphalt pavement additive, based on the salt-storage type asphalt pavement additive according to claims 1-2, characterized in that: The preparation method comprises the following steps: S1: core material preparation; S2: Wrapping material selection and preparation; S3: Core material coating and curing; S4: Crushing and packaging.

4. The method for preparing a salt-storage asphalt pavement additive according to claim 3, characterized in that: In step S1, an appropriate amount of sodium chloride is dissolved in water to form a saturated solution. The ratio of the solute to the solvent can be adjusted according to the required concentration. Silicate is slowly added to the sodium chloride solution and stirred until it is completely dissolved.

5. The method for preparing a salt-storage type asphalt pavement additive according to claim 4, characterized in that: Meanwhile, in step S1, sodium chloride is mixed with diatomaceous earth and processed through a specific production process to form a filler or aggregate having salt storage and anti-icing functions, thereby forming a mixture.

6. The method for preparing a salt-storage type asphalt pavement additive according to claim 3, characterized in that: In step S2, the polyacrylamide aqueous solution and the pre-dissolved polymer solution coating material are slowly added to the mixture, and stirring is continued, and the mixture is used as the coating material.

7. The method for preparing a salt-storage type asphalt pavement additive according to claim 6, characterized in that: At the same time, in step S2, the asphalt is heated to its fluid state and then slowly added to the above mixture to ensure that the asphalt is evenly combined with the mixture; After the bitumen is added, the surfactant is added to the mixture and stirring is continued to ensure that all ingredients are evenly dispersed in the bitumen.

8. The method for preparing a salt-storage type asphalt pavement additive according to claim 7, characterized in that: In step S3, the mixture is cooled to room temperature and then cured; during the curing, the temperature is 140-160° C. for 30-50 minutes; After step S3, in step S4, the solidified material is appropriately crushed and packaged.

9. The method for preparing a salt-storage type asphalt pavement additive according to claim 6, characterized in that: The surfactants are anionic surfactants, cationic surfactants, nonionic surfactants and zwitterionic surfactants, which are put in sequentially and stirred.

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