Reaction type asphalt cold patch material, preparation method and application

Abstract

This invention provides a reactive asphalt cold patch material, its preparation method, and its application. The reactive asphalt cold patch material uses a composition comprising components A, B, and C. Component A includes aggregates, component B includes asphalt and a reactive diluent, and component C includes an alkaline solution. The reactive diluent is capable of undergoing a saponification reaction with the alkaline solution. The reactive diluent is liquid at room temperature and can dissolve the asphalt. This invention allows for storage after mixing, eliminating the need for on-site mixing and improving the safety and convenience of road patching construction. Furthermore, the asphalt cold patch material exhibits excellent performance after molding.

Description

Technical Field

[0001] This invention belongs to the field of road engineering materials, and particularly relates to a reactive asphalt cold patching material, its preparation method, and its application. Background Technology

[0002] Potholes, as an early-stage pavement defect, are a key focus of routine road maintenance. However, their high frequency, localized nature, and dispersed occurrence limit the application of hot-mix asphalt mixtures in pothole repair. Cold-mix asphalt mixtures (cold-applied asphalt patching materials) offer advantages such as energy conservation, emission reduction, low carbon footprint, timely repair, and safety and convenience. They avoid the material and energy waste and seasonal limitations associated with traditional hot-mix asphalt repair methods, aligning with the sustainable development philosophy of the road maintenance industry and gaining widespread acceptance.

[0003] Currently, cold asphalt patch materials can be classified into three categories based on their strength formation mechanisms: emulsified, solvent-based, and reactive. Emulsified cold asphalt patch materials use emulsified asphalt as the binder, relying on water evaporation and the demulsification of the emulsified asphalt to form bond strength. Solvent-based cold asphalt patch materials mainly use diesel-based volatile solvents as diluents, relying primarily on the evaporation of the diluent to form bond strength. Both emulsified and solvent-based cold asphalt patch materials suffer from low early-stage strength, slow later-stage strength growth, poor water stability, and the potential for environmental pollution from volatile solvents. Reactive cold asphalt patch materials primarily form bond strength through the cross-linking and curing reaction of resins. However, reactive cold asphalt patch materials are generally mixed on-site for pothole repair, requiring immediate application, which affects the safety and convenience of road patching construction.

[0004] Therefore, it is necessary to provide a reactive asphalt cold patching material, its preparation method, and its application to solve or at least alleviate the technical problem of how to overcome the need for on-site mixing and use of reactive asphalt cold patching materials during construction. Summary of the Invention

[0005] The main objective of this invention is to provide a reactive asphalt cold patching material, its preparation method, and its application, aiming to solve the technical problem of how to overcome the need for on-site mixing and use of reactive asphalt cold patching materials during construction.

[0006] To achieve the above objectives, the present invention provides a method for preparing a reactive asphalt cold patch, wherein the raw materials used in the reactive asphalt cold patch include a composition; the composition includes component A, component B and component C; component A includes aggregate, component B includes asphalt and a reactive diluent, and component C includes an alkaline solution;

[0007] The reactive diluent can undergo a saponification reaction with the alkaline solution; the reactive diluent is liquid at room temperature and can dissolve the asphalt;

[0008] The preparation method includes the following steps:

[0009] S1, heating the asphalt to 140-170°C; mixing the asphalt and the reactive diluent at 140-170°C to obtain cold patch asphalt;

[0010] S2, mix component A and cold patch asphalt to obtain preliminary cold patch material; then seal and store the preliminary cold patch material.

[0011] S3. After storage, take out the initial cold patch material and spread it on the working surface; apply component C to the initial cold patch material to obtain reactive asphalt cold patch material.

[0012] Furthermore, in component A, the mass percentage of the aggregate is not less than 90%;

[0013] Component A further includes filler; the mass percentage of the filler in component A is no more than 10%.

[0014] By mass, component A comprises 100 parts, asphalt comprises 3-6 parts, and reactive diluent comprises 0.75-6 parts;

[0015] By mass, component A comprises 100 parts, and the alkaline solution comprises 1-6 parts.

[0016] Furthermore, the reactive diluent includes unsaturated fatty acids; the alkaline solution contains an alkaline substance with a mass concentration of 10-35%, and the alkaline substance is strongly alkaline.

[0017] Furthermore, the unsaturated fatty acids include one or more of linoleic acid, linolenic acid, and vegetative oleic acid; the alkaline substances include one or more of sodium hydroxide and potassium hydroxide.

[0018] Furthermore, in step S2, the mixing temperature of component A and the cold-mixed asphalt is 10-40℃;

[0019] In step S3, the method of applying component C to the initial cold-pressed material includes: spraying the alkaline solution onto the initial cold-pressed material.

[0020] Furthermore, the solid content of the cold-mixed asphalt is 50-80%.

[0021] Furthermore, the storage temperature is 10-40℃; the storage time is not less than 1 day, until it no longer has workability.

[0022] The present invention also provides a reactive asphalt cold patching material, which is prepared by any of the reactive asphalt cold patching material preparation methods described above.

[0023] The present invention also provides an application of the preparation method of reactive asphalt cold patching material as described above in road patching construction.

[0024] Compared with the prior art, the present invention has at least the following advantages:

[0025] This invention allows the initial cold patch material to be stored for later use after mixing. Subsequently, only an alkaline solution needs to be applied during construction to form the reactive asphalt cold patch material, eliminating the need for remixing. This avoids the problem of reactive asphalt cold patch material needing to be mixed and used immediately, improving the safety and convenience of road patching construction. Furthermore, the asphalt cold patch material of this invention exhibits excellent performance after molding.

[0026] In this invention, the reactive diluent can reduce the viscosity of asphalt, ensuring the workability of cold patch material at room temperature. At the same time, the reactive diluent is poorly soluble in water, ensuring that it does not react with moisture in the air during storage. After being sealed in bags, it can be stored for more than one year. This solves the technical pain point of existing reactive asphalt cold patch materials that require on-site mixing or can only be stored for a short period of time, and is conducive to the promotion and application of reactive asphalt cold patch materials.

[0027] In this invention, after the initial cold patch material is laid on the working surface, it is only necessary to spray an alkaline solution onto the initial cold patch material to convert it into a shaped asphalt cold patch material. The construction is more convenient and faster, and the requirements for the construction site are also lower. In addition, the reactive diluent in this invention undergoes a saponification reaction with the alkaline solution, and the product can increase the early strength of the asphalt cold patch material, so that traffic can be opened quickly after the construction is completed.

[0028] In this invention, the fatty acid salt generated by the saponification reaction between the reactive diluent and the alkaline solution has an oleophilic end and a hydrophilic end. The oleophilic group combines with the asphalt, and the hydrophilic group combines with the aggregate, thereby improving the adhesion between the asphalt and the aggregate and enhancing the adhesion and road performance of the reactive asphalt cold patch.

[0029] In this invention, the long-chain fatty acid salt molecules generated by the saponification reaction between the reactive diluent and the alkaline solution can combine with the aromatic hydrocarbon molecules in the asphalt to form a dense network structure, thereby enhancing the interaction between asphalt molecules and helping to improve the road performance of reactive asphalt cold patching material. Detailed Implementation

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0032] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise stated in the present invention, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this invention, as well as the prior art known to those skilled in the art and the description of this invention, may be implemented using any prior art methods, devices, and materials similar to or equivalent to those described, used, or made of materials in the embodiments of this invention.

[0033] The present invention provides a composition of a reactive asphalt cold patch material that can be stored for a long time, comprising component A, component B and component C; wherein component A comprises aggregate, component B comprises asphalt and reactive diluent, and component C comprises alkaline solution.

[0034] In this invention, the reactive diluent can undergo a saponification reaction with the alkaline solution; the reactive diluent is liquid at room temperature and can dissolve the asphalt; the dissolution is defined as the process by which the asphalt is uniformly dispersed in the reactive diluent to form a solution.

[0035] As a further explanation of component A, the mass percentage of the aggregate in component A is not less than 90%; component A may also include filler; the mass percentage of the filler in component A is not greater than 10%.

[0036] In this invention, component A meets the requirements of the "Technical Specification for Construction of Asphalt Pavement on Highways" (JTG F40-2004). Specifically, the aggregate and the filler meet the requirements of the "Technical Specification for Construction of Asphalt Pavement on Highways" (JTG F40-2004) and also meet the gradation requirements of the "Technical Specification for Construction of Asphalt Pavement on Highways" (JTG F40-2004). Specifically, the aggregate may include one or more of basalt, diabase, and limestone, and the filler may include limestone powder.

[0037] In conjunction with component A, component B is further described as follows: by mass parts, component A comprises 100 parts, the asphalt comprises 3-6 parts, and the reactive diluent comprises 0.75-6 parts; the solid content of component B is 50-80%, further comprising 50-70%; specifically, the solid content is the mass percentage of the asphalt in component B, and the mass of component B is the sum of the masses of the asphalt and the reactive diluent.

[0038] In conjunction with component A, component C is further described as follows: by mass parts, component A is 100 parts, and the alkaline solution is 1-6 parts.

[0039] As another illustration, the composition comprises, by weight parts: 90-100 parts aggregate, 0-10 parts filler, 3-6 parts asphalt, 0.75-6 parts reactive diluent, and 1-6 parts alkaline solution.

[0040] Further, by mass parts, the composition comprises: 90-100 parts aggregate, 0-10 parts filler, 4-6 parts asphalt, 2-6 parts reactive diluent, and 1-6 parts alkaline solution.

[0041] Further, by mass parts, the composition comprises: 90-95 parts aggregate, 5-10 parts filler, 4-6 parts asphalt, 3-6 parts reactive diluent, and 4-6 parts alkaline solution.

[0042] In this invention, the asphalt includes one or more of road petroleum asphalt and modified asphalt, and may be a mixture of one or both in any proportion.

[0043] In this invention, the reactive diluent includes unsaturated fatty acids; the unsaturated fatty acids include one or more of linoleic acid, linolenic acid, and vegetative oleic acid; further, the reactive diluent includes one or more of linoleic acid and vegetative oleic acid; the reactive diluent can be a mixture of linoleic acid and vegetative oleic acid, with a mass ratio of linoleic acid to vegetative oleic acid of 0.8-1.2:0.8-1.2.

[0044] In the alkaline solution of the present invention, the mass concentration of the alkaline substance is 10-35%, more preferably 28-35%, and more preferably 30-32%; the alkaline substance is strongly alkaline, and the alkaline substance includes one or more of sodium hydroxide and potassium hydroxide; specifically, the alkaline solution includes one or more of sodium hydroxide solution and potassium hydroxide solution; the mass concentration of the sodium hydroxide solution is 10-35%, more preferably 28-35%, and more preferably 30-32%; the mass concentration of the potassium hydroxide solution is 10-35%, more preferably 28-35%, and more preferably 30-32%.

[0045] In the composition, component A, component B, and component C of the present invention, any limitation on the ingredients can be changed from "including" to "into". As another embodiment, other commonly used additives, such as modifiers, anti-aging agents, anti-stripping agents, tackifiers, toughening agents, etc., can also be added as needed.

[0046] The present invention also provides a method for preparing a reactive asphalt cold patch material that can be stored for a long time, wherein the raw materials used in the reactive asphalt cold patch material include any of the compositions described above.

[0047] The preparation method includes the following steps:

[0048] S1, heat the asphalt to 140-170℃, making it fluid; add a reactive diluent to the asphalt, and mix the asphalt and the reactive diluent at 140-170℃ to obtain cold patch asphalt; the mixing time can be 10-60 minutes; the mixing speed can be 100-1000 rpm.

[0049] S2, mix component A and cold patch asphalt evenly to obtain initial cold patch material; then seal and store the initial cold patch material.

[0050] In this invention, before mixing the component A and the cold-mixed asphalt, the components in the component A are dried and then cooled to room temperature; specifically, the aggregate and the filler are dried and then cooled to room temperature to obtain the graded mineral aggregate.

[0051] In this invention, the components of component A and the cold-patch asphalt are mixed in advance outside the construction site to obtain the initial cold-patch material; the mixing temperature of component A and the cold-patch asphalt is 10-40℃, usually room temperature; the initial cold-patch material is a mixture. The solid content of the cold-patch asphalt is 50-80%, further 50-70%; specifically, the solid content is the mass percentage of the asphalt in component B, and the mass of component B is the sum of the masses of the asphalt and the reactive diluent.

[0052] In this invention, the storage time can be no less than one day, until the material loses its workability, specifically 1-60 days, 30-60 days, 1-365 days, or 60-365 days; the storage time can also be greater than 365 days, until the material loses its workability. The storage temperature is 10-40℃, usually at room temperature; the storage method can be bagging, where the initial cold patching material is placed in a bag and sealed for storage.

[0053] It should be understood that, in this invention, long-term storage refers to the mixed material after mixing, specifically the initial cold-pressed material.

[0054] It should be noted that the present invention mixes component A and the cold patch asphalt and then stores them in a sealed container, which avoids the need for on-site mixing and immediate use. Furthermore, the initial cold patch material has a long storage time and can be uniformly prepared, scheduled, and stored.

[0055] S3. After storage, the initial cold patch material is taken out and spread on the working surface under normal outdoor ambient temperature; component C is applied to the initial cold patch material to obtain reactive asphalt cold patch material.

[0056] In this invention, the application is uniform spraying, and the method of applying component C to the initial cold-mix material includes: uniformly spraying the alkaline solution onto the initial cold-mix material.

[0057] The present invention also provides a reactive asphalt cold patching material that can be stored for a long time, which is prepared by any of the reactive asphalt cold patching material preparation methods described above.

[0058] The present invention also provides an application of the preparation method of reactive asphalt cold patching material as described above in road patching construction.

[0059] The road has pothole-type defects; the road surface is asphalt. The application includes: road patching construction using any of the preparation methods described above; during the application process, the initial cold patch material is prepared in advance and sealed for storage. When needed, it is transported to the work site, then the initial cold patch material is taken out and evenly spread on the work surface; then the alkaline solution in component C is evenly sprayed, and after compaction, traffic can be opened, which is more convenient and efficient.

[0060] It should be noted that existing reactive cold patch asphalt is generally mixed on-site for pothole repair and cannot be stored for a long time; in the construction process of this invention, only the stored initial cold patch material needs to be taken out, spread, and then sprayed with an alkaline solution.

[0061] This invention comprehensively considers the characteristics and application difficulties of current solvent-based and reactive cold patch materials. By introducing a reactive diluent to reduce the viscosity of asphalt, this invention ensures the workability of the cold patch material at room temperature. At the same time, the reactive diluent is poorly soluble in water and can be stored for a long time after being bagged. After the initial cold patch material is spread on the working surface, the reactive diluent reacts chemically with the applied alkaline solution, and the product can increase the early strength of the cold patch material, thus overcoming the technical defect of existing reactive asphalt cold patch materials that are mixed and used immediately and cannot be stored for a long time.

[0062] Compared to solvent-based cold patch asphalt that uses diesel as a diluent and relies on diesel evaporation, reactive cold patch asphalt exhibits a faster chemical reaction rate than diesel evaporation, resulting in a faster strength increase. Furthermore, unlike conventional reactive cold patch asphalt which is mostly mixed and used on-site or can only be stored briefly, this invention allows for long-term storage after mixing. In addition, the method of this invention is simple, low-cost, and uses widely available raw materials, making it highly applicable and requiring no modifications to existing cold patch asphalt production equipment.

[0063] The following are specific examples of the present invention:

[0064] The performance testing of cold patch material is conducted in accordance with the industry standards "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011), "Technical Specifications for Construction of Asphalt Pavement on Highway" (JTG F40-2004), and "Cold Patch Material for Potholes in Asphalt Pavement" (JT / T972-2015).

[0065] Example 1

[0066] In this embodiment, the composition of the reactive asphalt cold patch material consists of component A, component B, and component C; this embodiment uses the components of this composition as raw materials to prepare the reactive asphalt cold patch material.

[0067] In the composition of reactive asphalt cold patching material, by mass parts:

[0068] Component A consists of 95 parts aggregate and 5 parts filler.

[0069] Component B consists of: 5.0 parts asphalt and 3.0 parts reactive diluent;

[0070] Component C is: 6.0 parts of alkaline solution.

[0071] In this embodiment, the aggregate is basalt (Hunan Kaixin Basalt Mining Co., Ltd.); the filler is limestone powder (Loudi Shirui Building Materials Co., Ltd.); the asphalt is No. 70 Grade A road petroleum asphalt (Jiangsu Baoli Asphalt Co., Ltd.); the reactive diluent component is vegetable oleic acid (Shandong Hengshuo Chemical Co., Ltd.); and the alkaline solution is industrial grade 32% sodium hydroxide solution (Chongqing Haoyu Chemical Co., Ltd.).

[0072] In this embodiment, the preparation method of reactive asphalt cold patching material adopts the following steps:

[0073] S1. Heat the asphalt to 155°C until it is in a fluid state; add a reactive diluent to the asphalt and stir at 300 rpm for 30 minutes at a stirring temperature of 160°C to prepare a cold patch asphalt with a solid content of 62.5%.

[0074] S2, after drying the aggregates and fillers and cooling them to room temperature, the aggregate is prepared; the aggregate gradation meets the LB-10 gradation in Table 8.4.2 of the "Technical Specification for Construction of Asphalt Pavement of Highway" (JTG F40-2004);

[0075] S3, mix cold patch asphalt and aggregate evenly at room temperature, pack the resulting room temperature mixture into bags and seal them for storage to obtain a primary cold patch material that can be stored for a long time at room temperature;

[0076] S4. Before testing, remove the bag of the initial cold patch material and weigh about 1200g of the initial cold patch material (the thickness of the specimen after compaction is 63.5±1.3mm). Use a small shovel to shovel the mixture into the Marshall mold, and use a tamper or a large screwdriver to tamp it 15 times along the perimeter and 10 times in the center. After tamping, level the surface of the initial cold patch material, spray an alkaline solution evenly, and then compact it on both sides 50 times to obtain reactive asphalt cold patch material.

[0077] In this embodiment, the initial cold patch material obtained in step S3 is divided into two portions. One portion is stored until it is no longer workable and the storage time is recorded. The other portion is stored for 60 days, then the bag is removed and reactive asphalt cold patch material is obtained according to step S4. The performance of the reactive asphalt cold patch material is tested according to the method of "Cold Patch Material for Potholes in Asphalt Pavement" (JT / T 972-2015).

[0078] Comparative Example 1

[0079] In this comparative example, the composition of the asphalt cold patch material consists of component A, component B, and component C; this comparative example uses the components of this composition as raw materials to prepare the asphalt cold patch material.

[0080] The composition of asphalt cold patching material, by mass parts:

[0081] Component A consists of 95 parts aggregate and 5 parts filler.

[0082] Component B consists of: 5.0 parts asphalt and 3.0 parts reactive diluent;

[0083] Component C is: 6.0 parts water.

[0084] In this comparative example, the aggregate used was basalt (Hunan Kaixin Basalt Mining Co., Ltd.); the filler used was limestone powder (Loudi Shirui Building Materials Co., Ltd.); the asphalt was No. 70 Grade A road petroleum asphalt (Jiangsu Baoli Asphalt Co., Ltd.); the reactive diluent component was vegetable oleic acid (Shandong Hengshuo Chemical Co., Ltd.); and the water was distilled water.

[0085] In this comparative example, the preparation method of the asphalt cold patching material adopts the following steps:

[0086] S1. Heat the asphalt to 155°C until it is in a fluid state; add a reactive diluent to the asphalt and stir at 300 rpm for 30 minutes at a stirring temperature of 160°C to prepare a cold patch asphalt with a solid content of 62.5%.

[0087] S2, after drying the aggregates and fillers and cooling them to room temperature, the aggregate is prepared; the aggregate gradation meets the LB-10 gradation in Table 8.4.2 of the "Technical Specification for Construction of Asphalt Pavement of Highway" (JTG F40-2004);

[0088] S3, mix cold patch asphalt and aggregate evenly at room temperature, pack the resulting room temperature mixture into bags and seal them for storage to obtain a primary cold patch material that can be stored for a long time at room temperature;

[0089] S4. Before testing, remove the bag of the initial cold patch material and weigh about 1200g of the initial cold patch material (the thickness of the specimen after compaction is 63.5±1.3mm). Use a small shovel to shovel the mixture into the Marshall mold, and use a tamper or a large screwdriver to tamp it 15 times around the perimeter and 10 times in the center. After tamping, level the surface of the initial cold patch material, spray water evenly, and then compact it on both sides 50 times to obtain the asphalt cold patch material.

[0090] In this comparative example, the initial cold patch material obtained in step S3 was divided into two portions. One portion was stored until it was no longer workable and the storage time was recorded. The other portion was stored for 60 days, then the bag was removed and the asphalt cold patch material was obtained according to step S4. The performance of the cold patch material was tested according to the method of "Cold Patch Material for Potholes in Asphalt Pavement" (JT / T 972-2015).

[0091] Analysis example 1

[0092] In Example 1 and Comparative Example 1, the test results of the asphalt cold patch are shown in Table 1; the Marshall stability and Marshall test residual stability are the test results of the asphalt cold patch after 60 days of storage, and the storage time is the storage time during which the initial cold patch has workability.

[0093] As shown in Table 1, compared with water-added asphalt cold patch material, asphalt cold patch material with added alkali solution showed an increase of 599.1% and 45.3% in Marshall stability and Marshall test residual stability, respectively; the storage time of the initial cold patch material was greater than 365 days.

[0094] Table 1. Cold patching performance of Example 1 and Comparative Example 1

[0095]

[0096] Example 2

[0097] In this embodiment, the composition of the reactive asphalt cold patch material consists of component A, component B, and component C; this embodiment uses the components of this composition as raw materials to prepare the reactive asphalt cold patch material.

[0098] In the composition of reactive asphalt cold patching material, by mass parts:

[0099] Component A consists of: 90 parts aggregate and 10 parts filler.

[0100] Component B consists of: 6.0 parts asphalt and 6.0 parts reactive diluent;

[0101] Component C is: 4.0 parts of alkaline solution.

[0102] In this embodiment, the aggregate is basalt (Hunan Kaixin Basalt Mining Co., Ltd.); the filler is limestone powder (Taoyuan County Xinyu Mineral Powder Plant); the asphalt is SBS modified asphalt ID (China Petroleum & Chemical Corporation Changling Refining & Chemical Co., Ltd.); the reactive diluent component is linoleic acid (Shandong Xinbaihe Chemical Technology Co., Ltd.); and the alkaline solution is 30% potassium hydroxide solution (Linyi Jinhe Chemical Technology Co., Ltd.).

[0103] In this embodiment, the preparation method of reactive asphalt cold patching material adopts the following steps:

[0104] S1. Heat the asphalt to 165°C until it is in a fluid state; add a reactive diluent to the asphalt and stir at 1000 rpm for 60 minutes at a stirring temperature of 165°C to prepare a cold patch asphalt with a solid content of 50%.

[0105] S2, after drying the aggregates and fillers and cooling them to room temperature, the aggregate is prepared into mineral aggregate; the aggregate gradation meets the SMA-10 gradation in Table 5.3.2-3 of the "Technical Specification for Construction of Asphalt Pavement of Highway" (JTG F40-2004);

[0106] S3, mix cold patch asphalt and aggregate evenly at room temperature, pack the resulting room temperature mixture into bags and seal them for storage, to obtain a primary cold patch material that can be stored for a long time at room temperature;

[0107] S4. Before testing, remove the bag of the initial cold patch material and weigh about 1200g of the initial cold patch material (the thickness of the specimen after compaction is 63.5±1.3mm). Use a small shovel to shovel the mixture into the Marshall mold, and use a tamper or a large screwdriver to tamp it 15 times along the perimeter and 10 times in the center. After tamping, level the surface of the initial cold patch material, spray an alkaline solution evenly, and then compact it on both sides 50 times to obtain reactive asphalt cold patch material.

[0108] In this embodiment, the initial cold patch material obtained in step S3 is divided into two portions. One portion is stored until it is no longer workable and the storage time is recorded. The other portion is stored for 60 days, then the bag is removed and reactive asphalt cold patch material is obtained according to step S4. The performance of the cold patch material is tested according to the method of "Cold Patch Material for Potholes in Asphalt Pavement" (JT / T 972-2015).

[0109] Comparative Example 2

[0110] In this comparative example, the composition of the asphalt cold patch material consists of component A, component B, and component C; this comparative example uses the components of this composition as raw materials to prepare the asphalt cold patch material.

[0111] The composition of asphalt cold patching material, by mass parts:

[0112] Component A consists of: 90 parts aggregate and 10 parts filler.

[0113] Component B consists of: 6.0 parts asphalt and 6.0 parts reactive diluent;

[0114] Component C is: 4.0 parts of alkaline solution.

[0115] In this comparative example, the aggregate used was basalt (Hunan Kaixin Basalt Mining Co., Ltd.); the filler used was limestone powder (Taoyuan County Xinyu Mineral Powder Plant); the asphalt was SBS modified asphalt ID (China Petroleum & Chemical Corporation Changling Refining & Chemical Co., Ltd.); the reactive diluent component was linoleic acid (Shandong Xinbaihe Chemical Technology Co., Ltd.); and the alkaline solution was 30% potassium hydroxide solution (Linyi Jinhe Chemical Technology Co., Ltd.).

[0116] In this comparative example, the preparation method of the asphalt cold patching material adopts the following steps:

[0117] S1. Heat the asphalt to 165°C until it is in a fluid state; add a reactive diluent to the asphalt and stir at 1000 rpm for 60 minutes at a stirring temperature of 165°C to prepare a cold patch asphalt with a solid content of 50%.

[0118] S2, after drying the aggregates and fillers and cooling them to room temperature, the aggregate is prepared into mineral aggregate; the aggregate gradation meets the SMA-10 gradation in Table 5.3.2-3 of the "Technical Specification for Construction of Asphalt Pavement of Highway" (JTG F40-2004);

[0119] S3. Mix the cold patch asphalt and aggregate evenly at room temperature, spray the resulting mixture evenly with an alkaline solution, pack it into a bag, seal it, and store it to obtain cold patch asphalt material. The storage temperature is room temperature.

[0120] In this comparative example, the asphalt cold patch material obtained in step S3 was stored in a place where it was not workable, and the storage time was recorded.

[0121] Analysis example 2

[0122] The test results of the asphalt cold patch material in Example 2 and Comparative Example 2 are shown in Table 2; the Marshall stability and Marshall test residual stability are the test results of the asphalt cold patch material after 60 days of storage, and the storage time is the storage time during which the initial cold patch material in Example 2 or the asphalt cold patch material in Comparative Example 2 has workability.

[0123] As shown in Table 2, compared with the addition of alkali solution to the joint, the Marshall stability and Marshall test residual stability of the cold patch material with alkali solution added before molding are 35.85kN and 95.2%, respectively, which meet the technical requirements of "Cold Patch Material for Potholes in Asphalt Pavement" (JT / T 972-2015). The initial cold patch material in Example 2 can be stored for more than 1 year, while the asphalt cold patch material with alkali solution added during storage can be stored for less than 1 day due to the rapid reaction, and relevant tests cannot be carried out after 60 days of storage.

[0124] Table 2. Cold patching performance of Example 2 and Comparative Example 2

[0125]

[0126] Example 3

[0127] In this embodiment, the composition of the reactive asphalt cold patch material consists of component A, component B, and component C; this embodiment uses the components of this composition as raw materials to prepare the reactive asphalt cold patch material.

[0128] In the composition of reactive asphalt cold patching material, by mass parts:

[0129] Component A consists of: 100 parts aggregate and 0 parts filler.

[0130] Component B consists of: 4.0 parts asphalt and 2.0 parts reactive diluent;

[0131] Component C is: 1.0 part of alkaline solution.

[0132] In this embodiment, the aggregate is limestone (Shirui Quarry, Shexingshan Town, Louxing District); the asphalt is No. 70 road petroleum asphalt (Changling Branch of China Petrochemical Corporation Asset Management Co., Ltd.); the reactive diluent component is linoleic acid (Shandong Xinbaihe Chemical Technology Co., Ltd.); and the alkaline solution is 30% potassium hydroxide solution (Linyi Jinhe Chemical Technology Co., Ltd.).

[0133] In this embodiment, the preparation method of reactive asphalt cold patching material adopts the following steps:

[0134] S1. Heat the asphalt to 145°C until it is in a fluid state; add a reactive diluent to the asphalt and stir at 100 rpm for 10 minutes at a stirring temperature of 145°C to prepare a cold patch asphalt with a solid content of 66.7%.

[0135] S2, after drying the aggregate, cool it to room temperature to obtain the mineral aggregate; the aggregate gradation meets the AC-16 gradation in Table 5.3.2-2 of the "Technical Specification for Construction of Asphalt Pavement of Highway" (JTG F40-2004);

[0136] S3, mix cold patch asphalt and aggregate evenly at room temperature, pack the resulting room temperature mixture into bags and seal them for storage to obtain a primary cold patch material that can be stored for a long time at room temperature;

[0137] S4. Before testing, remove the bag of the initial cold patch material and weigh about 1200g of the initial cold patch material (the thickness of the specimen after compaction is 63.5±1.3mm). Use a small shovel to shovel the mixture into the Marshall mold, and use a tamper or a large screwdriver to tamp it 15 times along the perimeter and 10 times in the center. After tamping, level the surface of the initial cold patch material, spray an alkaline solution evenly, and then compact it on both sides 50 times to obtain reactive asphalt cold patch material.

[0138] In this embodiment, the initial cold patch material obtained in step S3 is divided into two portions. One portion is stored until it is no longer workable and the storage time is recorded. The other portion is stored for 60 days, then the bag is removed and reactive asphalt cold patch material is obtained according to step S4. The performance of the cold patch material is tested according to the method of "Cold Patch Material for Potholes in Asphalt Pavement" (JT / T 972-2015).

[0139] Comparative Example 3

[0140] In this comparative example, the composition of the asphalt cold patch material consists of component A, component B, and component C; this comparative example uses the components of this composition as raw materials to prepare the asphalt cold patch material.

[0141] The composition of asphalt cold patching material, by mass parts:

[0142] Component A consists of: 100 parts aggregate and 0 parts filler.

[0143] Component B consists of: 4.0 parts asphalt and 2.0 parts diluent;

[0144] Component C is: 1.0 part of alkaline solution.

[0145] In this comparative example, the aggregate used was limestone (Shirui Quarry, Shexingshan Town, Louxing District); the asphalt was No. 70 road petroleum asphalt (Changling Branch of China Petrochemical Corporation Asset Management Co., Ltd.); the diluent component was diesel oil (No. 0 diesel oil of China Petrochemical Fuel Oil Sales Co., Ltd.); and the alkaline solution was 30% potassium hydroxide solution (Linyi Jinhe Chemical Technology Co., Ltd.).

[0146] In this comparative example, the preparation method of the asphalt cold patching material adopts the following steps:

[0147] S1. Heat the asphalt to 145°C until it is in a fluid state; add a thinner to the asphalt and stir at 100 rpm for 10 minutes at a stirring temperature of 145°C to prepare a cold patch asphalt with a solid content of 66.7%.

[0148] S2, after drying the aggregate, cool it to room temperature to obtain the mineral aggregate; the aggregate gradation meets the AC-16 gradation in Table 5.3.2-2 of the "Technical Specification for Construction of Asphalt Pavement of Highway" (JTG F40-2004);

[0149] S3, mix cold patch asphalt and aggregate evenly at room temperature, pack the resulting room temperature mixture into bags and seal them for storage to obtain a primary cold patch material that can be stored for a long time at room temperature;

[0150] S4. Before testing, remove the initial cold patch material from the bag and weigh approximately 1200g of it (the thickness of the compacted specimen should be 63.5±1.3mm). Use a small shovel to shovel the mixture into a Marshall mold, and tamp it 15 times around the perimeter and 10 times in the center using a trowel or large screwdriver. After tamping, level the surface of the initial cold patch material, then evenly spray it with an alkaline solution, and compact it 50 times on both sides to obtain reactive asphalt cold patch material.

[0151] In this comparative example, the initial cold patch material obtained in step S3 was divided into two portions. One portion was stored until it was no longer workable and the storage time was recorded. The other portion was stored for 60 days, then the bag was removed and the asphalt cold patch material was obtained according to step S4. The performance of the cold patch material was tested according to the method of "Cold Patch Material for Potholes in Asphalt Pavement" (JT / T 972-2015).

[0152] Analysis example 3

[0153] In Example 3 and Comparative Example 3, the test results of the cold patch are shown in Table 3; the Marshall stability and Marshall test residual stability are the test results of the asphalt cold patch after 60 days of storage, and the storage time is the storage time during which the initial cold patch has workability.

[0154] As shown in Table 3, compared with Comparative Example 3 which uses diesel, the Marshall stability and Marshall test residual stability of Example 3 which uses linoleic acid increased by 749.7% and 14.8%, respectively; the initial cold-filled materials of both examples can be stored for more than 1 year.

[0155] Table 3. Cold patching performance of Example 3 and Comparative Example 3

[0156]

[0157] Example 4

[0158] In this embodiment, the composition of the reactive asphalt cold patch material consists of component A, component B, and component C; this embodiment uses the components of this composition as raw materials to prepare the reactive asphalt cold patch material.

[0159] In the composition of reactive asphalt cold patching material, by mass parts:

[0160] Component A consists of 95 parts aggregate and 5 parts filler.

[0161] Component B consists of: 4.0 parts asphalt and 4.0 parts reactive diluent (2.0 parts linoleic acid and 2.0 parts vegetable oleic acid).

[0162] Component C is: 5.0 parts of alkaline solution.

[0163] In this embodiment, the aggregate is limestone (Shirui Quarry, Shexingshan Town, Louxing District); the filler is limestone powder (Xinyu Mineral Powder Plant, Taoyuan County); the asphalt is No. 70 road petroleum asphalt (Changling Branch of China Petrochemical Corporation Asset Management Co., Ltd.); the reactive diluent components are linoleic acid (Shandong Xinbaihe Chemical Technology Co., Ltd.) and vegetable oleic acid (Shandong Hengshuo Chemical Co., Ltd.); and the alkaline solution is 30% potassium hydroxide solution (Linyi Jinhe Chemical Technology Co., Ltd.).

[0164] In this embodiment, the preparation method of reactive asphalt cold patching material adopts the following steps:

[0165] S1. Heat the asphalt to 145°C until it is in a fluid state; add a reactive diluent to the asphalt and stir at 300 rpm for 20 minutes at a stirring temperature of 145°C to prepare a cold patch asphalt with a solid content of 50.0%.

[0166] S2, after drying the aggregates and fillers and cooling them to room temperature, the aggregate is prepared into mineral aggregate; the aggregate gradation meets the AC-10 gradation in Table 5.3.2-2 of the "Technical Specification for Construction of Asphalt Pavement of Highway" (JTG F40-2004);

[0167] S3, mix cold patch asphalt and aggregate evenly at room temperature, pack the resulting room temperature mixture into bags and seal them for storage, to obtain a primary cold patch material that can be stored for a long time at room temperature;

[0168] S4. Before testing, remove the bag of the initial cold patch material and weigh about 1200g of the initial cold patch material (the thickness of the specimen after compaction is 63.5±1.3mm). Use a small shovel to shovel the mixture into the Marshall mold, and use a tamper or a large screwdriver to tamp it 15 times along the perimeter and 10 times in the center. After tamping, level the surface of the initial cold patch material, spray an alkaline solution evenly, and then compact it on both sides 50 times to obtain reactive asphalt cold patch material.

[0169] In this embodiment, the initial cold patch material obtained in step S3 is divided into two portions. One portion is stored until it is no longer workable and the storage time is recorded. The other portion is stored for 60 days, then the bag is removed and reactive asphalt cold patch material is obtained according to step S4. The performance of the cold patch material is tested according to the method of "Cold Patch Material for Potholes in Asphalt Pavement" (JT / T 972-2015).

[0170] In this embodiment, the test results of the cold patch material are shown in Table 4; the Marshall stability and Marshall test residual stability are the test results of the asphalt cold patch material after 60 days of storage, and the storage time is the storage time during which the initial cold patch material has workability. As can be seen from Table 4, the asphalt cold patch material of Example 4 has good performance, and the storage time of the initial cold patch material is greater than 1 year.

[0171] Table 4 Performance of cold patching material in Example 4

[0172]

[0173] The above technical solutions of the present invention are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A method for preparing a reactive asphalt cold patching compound, characterized in that, The reactive asphalt cold patching material uses a composition as its raw material; the composition includes component A, component B and component C; component A includes aggregate, component B includes asphalt and reactive diluent, and component C includes alkaline solution; By mass, component A comprises 100 parts, asphalt comprises 3-6 parts, reactive diluent comprises 0.75-6 parts, and alkaline solution comprises 1-6 parts; The reactive diluent can undergo a saponification reaction with the alkaline solution; the reactive diluent is liquid at room temperature and can dissolve the asphalt; the reactive diluent is an unsaturated fatty acid; the mass concentration of the alkaline substance in the alkaline solution is 10-35%, and the alkaline substance is strongly alkaline; The preparation method includes the following steps: S1, heating the asphalt to 140-170℃; mixing the asphalt and the reactive diluent at 140-170℃ to obtain cold-patch asphalt; the solid content of the cold-patch asphalt is 50-80%; S2, mix the component A and the cold patch asphalt to obtain the initial cold patch material; then seal and store the initial cold patch material for 1-60 days. S3. After storage, take out the initial cold patch material and spread it on the working surface; apply component C to the initial cold patch material to obtain reactive asphalt cold patch material.

2. The method for preparing reactive asphalt cold patching material according to claim 1, characterized in that, In component A, the mass percentage of the aggregate is not less than 90%. Component A further includes filler; the mass percentage of the filler in component A is no more than 10%.

3. The method for preparing reactive asphalt cold patching material according to claim 1, characterized in that, The unsaturated fatty acids include one or more of linoleic acid, linolenic acid, and vegetative oleic acid; the alkaline substances include one or more of sodium hydroxide and potassium hydroxide.

4. The method for preparing reactive asphalt cold patching material according to claim 1, characterized in that, In step S2, the mixing temperature of component A and cold-mixed asphalt is 10-40℃. In step S3, the method of applying component C to the initial cold-pressed material includes: spraying the alkaline solution onto the initial cold-pressed material.

5. The method for preparing reactive asphalt cold patching material according to claim 1, characterized in that, The storage temperature is 10-40℃.

6. A reactive asphalt cold patching compound, characterized in that, It is prepared using the preparation method of reactive asphalt cold patching material as described in any one of claims 1-5.

7. The application of a method for preparing reactive asphalt cold patching material as described in any one of claims 1-5 in road patching construction.

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