High-performance-strong-diffusion regenerant with targeting mechanism for cold recycled asphalt mixture and preparation method of high-performance-strong-diffusion regenerant

Abstract

The invention relates to a cold recycled asphalt mixture high-performance-strong-diffusion recycling agent with a targeting mechanism and a preparation method thereof, and belongs to the field of road engineering asphalt regeneration, the recycling agent comprises, by weight, 10-20 parts of an activation component, 20-30 parts of a diffusion component, and 50-70 parts of a regeneration component; the activation component is a mixed solution of a betaine surfactant, polyoxyethylene alkylphenol ether and a phosphate buffer, the diffusion component comprises one or a combination of more of a light petroleum product and waste engine oil, and the regeneration component is one or a combination of more of aromatic hydrocarbon oil with the aromatic hydrocarbon content exceeding 10%, coal tar and waste edible oil. Through a special targeting mechanism, the method can accurately act on an aged asphalt layer on the surface of recycled asphalt, and excessive action on aggregate is avoided. Due to the targeting property, the efficiency of the regenerant is improved, the influence on the aggregate is reduced, and the stability and strength of the regenerated mixture are ensured.

Description

Technical Field

[0001] The invention belongs to the field of asphalt regeneration in road engineering, and specifically relates to a high-performance and strong diffusion regeneration agent for cold regenerated asphalt mixture with a targeting mechanism and a preparation method thereof. Background Art

[0002] Road infrastructure is an important part of the transportation sector. Due to its large scale, highways consume a lot of energy and generate a lot of carbon emissions during construction, maintenance and operation. Due to the special properties of raw materials, traditional asphalt pavement construction not only brings energy consumption and carbon emissions, but also releases a large amount of harmful gases, seriously polluting the environment. With the continuous improvement of my country's highway network, the development of infrastructure has gradually transitioned from "construction-oriented" to a new stage of "equal emphasis on construction and maintenance" and "maintenance-oriented". In the process of asphalt pavement maintenance, the accumulation of recycled asphalt mixture (RAP) not only wastes land resources, but also causes environmental pollution, becoming a major problem that needs to be solved urgently.

[0003] Asphalt pavement regeneration technology can effectively digest RAP and reduce the consumption of non-renewable resources such as asphalt and stone. It is an important way to deal with the problem of RAP accumulation and promote the realization of the "dual carbon" goals. According to the mixing temperature of the mixture during the regeneration process, asphalt pavement regeneration technology can be divided into two categories: hot regeneration and cold regeneration. Among them, cold regeneration technology does not require heating and insulation during the production and transportation of the mixture, can adapt to low temperature environments, and reduce harmful gas emissions, and has significant advantages in energy saving and emission reduction. However, the current cold regeneration technology mainly regards RAP as stone, ignoring the high value of asphalt in it, resulting in the widespread use of cold recycled asphalt mixtures in low-level pavement maintenance, with problems such as low application value and unstable road performance.

[0004] High-efficiency regeneration agents are the key to restoring the performance of cold-recycled asphalt mixtures and improving their application value. At present, there have been a lot of studies on the action mechanism, design methods and regeneration performance of regeneration agents, but most of the research focuses on hot regeneration technology. There are few studies on cold regeneration regeneration agents, and most methods based on hot regeneration technology lack independent theoretical support. Since the state of aged asphalt in the room temperature mixing process is significantly different from that of hot mix asphalt, the design of cold regeneration regeneration agents cannot completely draw on the hot regeneration process. Therefore, how to activate aged asphalt at room temperature and achieve efficient regeneration is a key issue in the design of cold regeneration regeneration agents. Summary of the invention

[0005] The present invention aims to enhance the application value of cold regeneration technology, and provides a high-performance and strong diffusion regeneration agent for cold regenerated asphalt mixture with a targeted mechanism and a preparation method thereof. The regeneration agent has good diffusion performance and regeneration performance at room temperature, and can act on the aged asphalt on the surface of RAP in a targeted manner. The regeneration agent prepared by the present invention can be used for cold regeneration projects such as factory-mixed cold regeneration, on-site cold regeneration, and full-thickness cold regeneration in highway construction.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A high-performance and strong diffusion regeneration agent for cold-regenerated asphalt mixture with a targeted mechanism, comprising, by weight, 10-20 parts of an activation component, 20-30 parts of a diffusion component, and 50-70 parts of a regeneration component; the activation component is a mixed solution of a betaine surfactant, a polyoxyethylene alkylphenol ether, and a phosphate buffer solution, wherein, by weight, the activation component comprises 1-2 parts of a betaine surfactant and 2-4 parts of a polyoxyethylene alkylphenol ether; the pH of the activation component is 6-7; the diffusion component comprises a combination of one or more of light petroleum products and waste engine oil, and the regeneration component is a combination of one or more of aromatic oil with an aromatic hydrocarbon content exceeding 10%, coal tar, and waste cooking oil.

[0008] The betaine surfactant includes one or more combinations of cocamidopropyl betaine and lauramidopropyl betaine.

[0009] The light petroleum product includes a combination of one or more of gasoline, diesel and kerosene.

[0010] A method for preparing a high-performance and highly diffusive regeneration agent for cold regenerated asphalt mixture with a targeting mechanism comprises the following steps:

[0011] Step 1, put 1-2 parts of betaine surfactant, 2-4 parts of polyoxyethylene alkylphenol ether and 94-97 parts of water into a blender and stir for 20-30 seconds to mix them evenly to obtain a mixed solution A, add phosphate buffer to the mixed solution A with a dropper to adjust the pH of the mixed solution A to 6-7 to obtain an activation component; stir 20-30 parts of the diffusion component and 50-70 parts of the regeneration component in a blender for 20-30 seconds to mix them evenly to obtain a mixed solution B;

[0012] Step 2: Put 10-20 parts of the activation components into the colloid mill, mix them thoroughly at a speed of not less than 2000r / min, and the stirring time is not less than 1min; while the colloid mill is running, gradually add the mixed solution B into the colloid mill, and continue stirring for 20-60s after all are added to obtain a high-performance and strong diffusion regeneration agent.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) The activation component designed in the present invention exhibits good affinity for asphalt in a weakly acidic or neutral environment, while avoiding excessive interaction with the surface of strongly negatively charged aggregates. Through a special targeting mechanism, it can accurately act on the aged asphalt layer on the surface of recycled asphalt (RAP) to avoid excessive interaction with aggregates. This targeting improves the efficiency of the regeneration agent, reduces the impact on aggregates, and ensures the stability and strength of the recycled mixture.

[0015] (2) The high-performance and strong diffusion regeneration agent prepared by the present invention has excellent diffusion and regeneration properties at room temperature, and can deeply act on the aged asphalt in the asphalt mixture to restore its original performance. It can significantly improve the regeneration effect at room temperature and effectively enhance the application value of cold regeneration technology.

[0016] (3) The regeneration agent of the present invention can be widely used in various cold recycling projects in highway construction, including factory-mixed cold recycling, on-site cold recycling and full-thickness cold recycling. Its excellent adaptability and high efficiency enable the regeneration agent to provide stable effects in different types of recycling projects, significantly improving the performance and service life of the recycled mixture. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of manufacturing samples for the diffusion performance test of the existing regeneration agent and the regeneration agent of the present invention;

[0018] Figure 2 It is a schematic diagram of the diffusion performance experimental results of the high-performance and strong diffusion regeneration agent prepared by the present invention;

[0019] Figure 3 It is a schematic diagram of the experimental results of the diffusion performance of common regenerants in the prior art;

[0020] Figure 4 It is a schematic diagram of preparing regeneration performance test samples of the existing regeneration agent and the regeneration agent of the present invention. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be clearly and completely described below in conjunction with the drawings and embodiments. Obviously, the described embodiments are only part of the embodiments of the invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Specific implementation method one:

[0023] A high-performance and strong diffusion regenerator for cold regenerated asphalt mixture with a targeted mechanism comprises 15 parts of an activation component, 20 parts of a diffusion component, and 65 parts of a regeneration component. The activation component comprises 2 parts of a betaine surfactant, 3 parts of a polyoxyethylene alkylphenol ether, and 95 parts of water, wherein the betaine surfactant is cocamidopropyl betaine. The diffusion component is kerosene, and the regeneration component is aromatic oil.

[0024] The preparation method comprises the following steps:

[0025] 1. Weigh 2 parts of cocamidopropyl betaine, 3 parts of polyoxyethylene alkylphenol ether, and 95 parts of water by mass fraction;

[0026] 2. Put the cocamidopropyl betaine, polyoxyethylene alkylphenol ether and water weighed in step 1 into a blender and stir for 30 seconds to uniformly mix them to obtain a mixed solution A;

[0027] 3. Use a dropper to gradually add phosphate buffer to the mixed solution A obtained in step 2 until the pH test result is 6-7 to obtain the activation component.

[0028] 4. Weigh 15 parts of activation component, 20 parts of diffusion component, and 65 parts of regeneration component by mass fraction. The diffusion component is kerosene, and the regeneration component is aromatic oil;

[0029] 5. Put the diffusion component and regeneration component weighed in step 4 into a blender and stir for 30 seconds to evenly mix the obtained mixed solution B;

[0030] 6. Put the activated components weighed in step 4 into the colloid mill and mix them thoroughly at a speed of 2800r / min for 1min;

[0031] 7. While the colloid mill is running, gradually add the mixed solution B obtained in step 5. After all the solution is added, continue stirring for 20 seconds to obtain a high-performance, strong diffusion regeneration agent. Specific implementation method 2:

[0033] The present embodiment is different from the first embodiment in that the betaine surfactant is lauramide propyl betaine, and the rest is the same as the first embodiment. Specific implementation method three:

[0035] The difference between this embodiment and the first embodiment is that the diffusion component uses waste oil rich in long-chain hydrocarbons, and the rest is the same as the first embodiment. Specific implementation method four:

[0037] The present embodiment is different from the first embodiment in that the regeneration component uses coal tar rich in aromatic hydrocarbons, and the rest is the same as the first embodiment.

[0038] In specific implementation, those skilled in the art can combine the above-mentioned implementation schemes with common sense to obtain a high-performance and highly diffusive regeneration agent for cold-regenerated asphalt mixture with a targeted mechanism.

[0039] The following test was used to demonstrate the diffusion performance and regeneration performance of the high performance-strong diffusion regenerator prepared in the specific embodiment 1:

[0040] Test 1: Specimen preparation method: Figure 1 As shown, first add aged asphalt to a certain scale in the test tube, then add two scales of high-performance and strong diffusion regeneration agent prepared in the specific implementation method 1, stir and let stand for 40 seconds, add 5 scales of adhesive, stir and wait for the adhesive to solidify, and then cut according to the scale to obtain the sample. Since the adhesive used has fluorescent characteristics, the fluorescent characteristics at the bottom of sample 4 are observed using a fluorescent microscope, and the fluorescent microscope image obtained by comparing with the finished regeneration agent in the prior art is as follows Figure 2 and 3 As shown in Figure 2, the high-performance and strong-diffusing regenerant exhibits more obvious fluorescence characteristics and has stronger diffusion performance.

[0041] Test 2: Specimen preparation method Figure 4 As shown, the complex modulus of samples 1, 2, and 3 at 64°C and 10 rad / s were tested using a dynamic shear rheometer temperature scan, and the aging factors of the three samples (i.e., sample complex modulus / complex modulus before aging) were calculated. The test results are shown in the following table.

[0042] Table 1

[0043]

[0044] From the results, it can be seen that the high-performance-strong diffusion regeneration agent has a performance recovery effect on both sample 1 and sample 2. While it has good diffusion performance, it has better regeneration performance than ordinary regeneration agents.

[0045] The regeneration agent prepared by the present invention has good diffusion performance at room temperature, and can penetrate into the aged asphalt on the surface of RAP at room temperature. At the same time, the regeneration agent has good regeneration performance and can restore the viscoelastic properties of aged asphalt. In addition, the regeneration agent also has a targeting mechanism, which can act directionally on the aged asphalt on the surface of recycled asphalt mixture (RAP). The regeneration agent provided by the present invention can effectively improve the regeneration efficiency of cold regeneration emulsion and the application value of cold regeneration asphalt mixture. In the context of the rapid development of the concepts of "low carbon" and "sustainability", it has important guiding significance for the application and promotion of cold regeneration technology.

[0046] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A high-performance and highly diffusive regeneration agent for cold-regenerated asphalt mixture with a targeted mechanism, characterized in that: By weight, it includes 10-20 parts of activation components, 20-30 parts of diffusion components, and 50-70 parts of regeneration components; the activation component is a mixed solution of betaine surfactant, polyoxyethylene alkylphenol ether and phosphate buffer, the diffusion component includes a combination of one or more of light petroleum products and waste engine oil, and the regeneration component is a combination of one or more of aromatic oil with an aromatic hydrocarbon content exceeding 10%, coal tar, and waste edible oil.

2. According to claim 1, a high-performance and highly diffusible regeneration agent for cold-regenerated asphalt mixture with a targeting mechanism, Features: The betaine surfactant includes one or more combinations of cocamidopropyl betaine and lauramidopropyl betaine.

3. According to claim 1, a high-performance and highly diffusible regeneration agent for cold-regenerated asphalt mixture with a targeting mechanism, Features: The activation component comprises, by weight, 1-2 parts of betaine surfactant and 2-4 parts of polyoxyethylene alkylphenol ether.

4. According to claim 1, a high-performance and highly diffusible regeneration agent for cold-regenerated asphalt mixture with a targeted mechanism, Features: The pH of the activation component is 6-7.

5. According to claim 1, a high-performance and highly diffusible regeneration agent for cold-regenerated asphalt mixture with a targeted mechanism, Features: The light petroleum product includes a combination of one or more of gasoline, diesel and kerosene.

6. A method for preparing a high-performance and highly diffusive regeneration agent for cold regenerated asphalt mixture with a targeting mechanism as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1: stirring and mixing a betaine surfactant, polyoxyethylene alkylphenol ether and water to obtain a mixed solution A, and adding a phosphate buffer solution dropwise to the mixed solution A to adjust the pH of the mixed solution A to 6-7, thereby obtaining an activation component; Step 2: put the activation component into the colloid mill, stir it evenly, then add the mixed solution B of the diffusion component and the regeneration component into the colloid mill, stir it evenly to obtain a high-performance and strong diffusion regeneration agent.

7. The preparation method according to claim 6, characterized in that: In step 1, in mixed solution A, by weight, 1-2 parts of betaine surfactant, 2-4 parts of polyoxyethylene alkylphenol ether, and 94-97 parts of water.

8. The preparation method according to claim 6, characterized in that: In step 1, the stirring time of the betaine surfactant, polyoxyethylene alkylphenol ether and water is 20-30 seconds.

9. The preparation method according to claim 6, characterized in that: In step 3, the activation components are placed in a colloid mill and fully mixed at a speed of not less than 2000 r / min for a stirring time of not less than 1 minute.

10. The preparation method according to claim 1, characterized in that: In step three, the diffusion component and the regeneration component are stirred in a mixer for 20-30 seconds to obtain a mixed solution B. After the mixed solution B is added to the colloid mill, the stirring is continued for 20-60 seconds to obtain a high-performance and strong diffusion regeneration agent.

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