Solid-waste-based biological regeneration emulsified asphalt and preparation and low-temperature construction method thereof

Abstract

The invention discloses solid-waste-based biological regeneration emulsified asphalt and a preparation and low-temperature construction method thereof, and belongs to the field of road building material technology and waste resource recycling. The emulsified asphalt is prepared from 100 parts of an asphalt component, 5-12 parts of a biomass regenerant, 1-5 parts of a solid waste-based cementing material, 1-3 parts of an emulsifier and 80-120 parts of water. Part of new asphalt and old asphalt are premixed, and then the mixture and liquid soap containing a biological regenerant and a solid waste cementing material are subjected to high-speed shearing together, so that efficient regeneration of aged asphalt is realized. During construction, the emulsified asphalt, the RAP material, the additional solid waste cementing material and water are mixed, paved and compacted at normal temperature through a sectional mixing process. According to the present invention, the multi-source solid waste high-value utilization of RAP, industrial solid waste and biological waste oil is achieved, the obtained cold regeneration mixture has characteristics of high early strength and excellent pavement performance, and the whole process has characteristics of low temperature and low carbon.

Description

Technical Field

[0001] This invention belongs to the field of road construction materials technology and waste resource recycling, specifically relating to a solid waste-based bio-regenerated emulsified asphalt, its preparation and low-temperature construction method. Background Technology

[0002] With the continuous growth in demand for highway construction and maintenance in my country, the generation and disposal of large quantities of recycled asphalt pavement (RAP) has become an urgent environmental and resource issue. At the same time, the reliance on traditional asphalt materials in road construction has led to high carbon emissions and energy consumption. Therefore, developing green, low-carbon, and efficient asphalt pavement recycling technologies to achieve the resource utilization of solid waste is of great significance for promoting sustainable development in the transportation sector.

[0003] Currently, asphalt pavement recycling technology is mainly divided into two categories: hot recycling and cold recycling.

[0004] Thermal recycling is a widely used method that restores the properties of asphalt mixtures by mixing RAP (Reclaimed Asphalt Aggregate) with new aggregates, new asphalt, and recycling agents at high temperatures (usually above 160°C). However, this technology has significant drawbacks: First, the high-temperature heating process not only consumes a lot of energy but also causes secondary aging of the old asphalt in the RAP and the newly added recycling agents, affecting the long-term durability of the recycled mixture; second, to ensure the mixing and compaction effect, construction is greatly affected by the season and climate; third, the dosage of RAP is usually limited, and excessive dosage can easily lead to uneven mixture properties and construction difficulties.

[0005] Emulsified asphalt cold recycling technology, as a low-temperature or room-temperature construction process, effectively avoids the high-temperature aging problems caused by hot recycling, and has advantages such as low energy consumption, low emissions, and flexible construction. This technology mixes emulsified asphalt, RAP material, water, and potentially active fillers at room temperature, and then paves and compacts the mixture. However, existing technologies also have many shortcomings: Insufficient recycling efficiency and performance: Conventional emulsified asphalt cold recycled mixtures rely on the re-cohesion of asphalt after emulsification, resulting in slow strength formation, low early strength, and a long curing period before opening to traffic, thus affecting project efficiency. Their final road performance (such as rutting resistance and crack resistance) is usually difficult to match the level of hot-mix asphalt mixtures, and they are mostly used for base courses or low-grade roads.

[0006] The recycling mechanism is simplistic: In traditional cold recycling technology, emulsified asphalt mainly acts as a binder, and its effect on the recycling of aged asphalt (i.e., restoring its properties) is limited. Even when a recycling agent is added, it is often separated from or simply mixed with the emulsification process, resulting in insufficient and uneven integration between the recycling agent and the aged asphalt, leading to unsatisfactory recycling results.

[0007] Solid waste utilization is singular and has low added value: Existing technologies mainly focus on the utilization of RAP (Reactive Acid-Based Polymer), with insufficient research on the co-utilization of other bulk industrial solid wastes or biomass wastes. Even when used, it is mostly a simple physical addition, failing to fully utilize the potential chemical activity or functional value of these solid waste materials, resulting in insufficient depth and breadth of resource utilization. Summary of the Invention

[0008] The technical problem to be solved by this invention is to overcome the shortcomings of the prior art and provide a high-performance, low-cost, ultra-low carbon solid waste-based bio-regenerated emulsified asphalt, its preparation and low-temperature construction method.

[0009] The technical solution adopted by the present invention to solve its technical problem is: the solid waste-based bio-regenerated emulsified asphalt, characterized in that its raw material composition by weight includes 100 parts asphalt component, 5-12 parts biomass regenerator, 1-5 parts solid waste-based cementitious material, 1-3 parts emulsifier and 80-120 parts water. The asphalt component comprises new asphalt and old asphalt from waste asphalt pavement materials; the mass ratio of new asphalt to old asphalt is 10~30:70~90. The biomass regeneration agent is waste bio-oil; The solid waste-based cementitious material comprises a mixture of blast furnace slag powder and fly ash, wherein the mass ratio of blast furnace slag powder to fly ash is 40-50:50-60, and the specific surface area of ​​both blast furnace slag powder and fly ash is controlled at 400 m². 2 / kg~500m 2 / kg.

[0010] This invention achieves efficient regeneration of high-proportion RAP under low-temperature conditions through the synergistic effect of biomass regenerators and solid waste-based cementitious materials. The resulting emulsified asphalt produces cold-recycled mixtures with high early strength, short curing cycles, and road performance approaching that of hot-mix asphalt, making it widely applicable to paving roads of all grades. This invention realizes the synergistic resource utilization of multi-source solid waste, including RAP, industrial solid waste, and biological waste oil.

[0011] Preferably, the biomass regenerator is used at 8% to 10% of the mass of the old asphalt. This preferred range allows the biomass regenerator to penetrate and soften the aged asphalt most effectively, precisely restoring its properties. Within this range, sufficient regeneration effect is ensured, avoiding poor performance recovery due to insufficient dosage, while also preventing excessive softening that could affect the mixture's strength and high-temperature stability. This is the core guarantee for achieving high-proportion, high-performance RAP regeneration.

[0012] Preferably, the biomass regenerator is waste oil recycled from the catering industry. This waste oil undergoes filtration before use to remove solid impurities, with the filter screen having a mesh size of 80-150 mesh. Catering waste oil is widely available and inexpensive, and this fine pretreatment via 80-150 mesh filtration thoroughly removes solid impurities from the oil, avoiding the risk of clogging equipment and disrupting the homogeneity of the asphalt during emulsification. Furthermore, it ensures the rheological stability of the regenerator, allowing it to penetrate the aged asphalt more efficiently and uniformly. This is a key guarantee for achieving repeatable regeneration results and controllable project quality.

[0013] Optionally, the biomass regenerator is a byproduct generated during the refining of vegetable oils, including but not limited to acid-refined oil, soapberry, or deodorized distillates. The components of acid-refined oil, soapberry, and other vegetable oil refining byproducts are similar to those of waste cooking oil, rich in regenerative active ingredients, and are stable in source and extremely low in cost. This not only further improves the utilization rate of solid waste resources but also provides diversified raw material options for the technical solution, enhances the adaptability and economic competitiveness of the process, and ensures the reliability of the regeneration effect.

[0014] Preferably, the emulsifier is a slow-cracking, fast-setting cationic asphalt emulsifier. The characteristics of this emulsifier ensure sufficient mixing and paving time with aggregates such as RAP, and also guarantee rapid strength formation after compaction, effectively shortening the curing cycle. The cationic nature further enhances the adsorption effect with aggregates, which is one of the core guarantees for achieving efficient low-temperature construction. Redicote E-7000 and Redicote E-6945 manufactured by Nouryon can be used in a weight ratio of 1 to 4:1.

[0015] Preferably, the raw material composition of the above-mentioned solid waste-based bio-regenerated emulsified asphalt further includes a co-emulsifier and a pH adjuster. The co-emulsifier is calcium chloride, and its dosage accounts for 1% to 5% of the emulsifier mass. The pH adjuster is hydrochloric acid or phosphoric acid. By introducing calcium chloride as a co-emulsifier, the interfacial activity of the cationic emulsifier in the complex system rich in bio-oil and solid waste particles is effectively enhanced, promoting the formation of a more stable and delicate emulsion. At the same time, the pH value of the soap solution is precisely adjusted to a strongly acidic environment of 2 to 3 using hydrochloric acid or phosphoric acid, providing the most suitable conditions for cationic emulsification and ensuring the chemical stability and repeatability of the emulsification process. The synergistic effect of the two ensures the smooth realization of the core process of "simultaneous emulsification and regeneration," and is a key auxiliary means to obtain high-performance recycled asphalt products.

[0016] A method for preparing the above-mentioned solid waste-based bio-regenerated emulsified asphalt, characterized by comprising the following steps: (1) Preparation of mixed asphalt: 60% to 80% of the new asphalt is mixed with all of the old asphalt at 140°C to 160°C to obtain mixed asphalt; (2) Preparation of soap solution: Mix water, emulsifier, biomass regeneration agent and solid waste-based cementitious material, and adjust the pH value to 2-3 with pH adjuster to obtain soap solution; (3) Simultaneous emulsification and regeneration: The mixed asphalt obtained in step (1), the remaining new asphalt and the soap solution obtained in step (2) are subjected to high-speed shear emulsification to obtain the solid waste-based bio-regenerated emulsified asphalt.

[0017] This preparation method achieves efficient and homogeneous recycling of a high proportion of old asphalt through an innovative process of stepwise mixing and simultaneous emulsification. First, most of the new asphalt is premixed with all the old asphalt at a relatively low temperature of 140℃~160℃, which effectively softens the aged asphalt and initiates its fusion, laying the foundation for recycling while avoiding secondary aging caused by prolonged high-temperature heating in traditional thermal recycling. Then, the biomass recycling agent is pre-integrated into the soap solution system, ensuring its uniform dispersion in the aqueous phase. Finally, the remaining new asphalt, premixed asphalt, and the soap solution containing the recycling agent are subjected to high-speed shearing. This process allows the recycling agent to penetrate, the old asphalt to soften, and the new asphalt to emulsify simultaneously, ensuring the uniformity and sufficiency of the recycling reaction and emulsion formation. The resulting emulsified asphalt has stable properties, providing a crucial material guarantee for subsequent low-temperature construction.

[0018] Preferably, in step (3), the high-speed shear emulsification rotation speed is 3000 r / min to 4500 r / min, and the shearing time is 5 min to 15 min. Within this rotation speed range, the shear force is sufficient to fully disperse the asphalt into micron-sized particles, forming a stable emulsion, while simultaneously enabling the bio-regenerating agent and the old asphalt to achieve molecular-level uniform fusion. This time window ensures sufficient dispersion and fusion, avoiding the risk of uneven regeneration due to excessively short time or emulsion precipitation due to excessively long time. It is a key process guarantee for obtaining regenerated emulsified asphalt with uniform performance and stable storage.

[0019] More preferably, in step (3), the specific process of high-speed shear emulsification is as follows: first, the new asphalt is initially mixed with the soap solution to form an emulsified environment, and then the mixed asphalt is added for high-speed shearing. This invention significantly improves process stability and regeneration effect through a "pre-emulsification" strategy. By first constructing a stable emulsified system with a portion of the new asphalt and soap solution, the risk of demulsification caused by the subsequent addition of high-viscosity mixed asphalt is effectively reduced. This preparatory environment ensures that the old asphalt particles can be quickly captured and uniformly dispersed, allowing the bio-regenerator to play a full role, and ultimately obtaining high-quality emulsified asphalt with uniform particle size, stable storage, and thorough regeneration.

[0020] A low-temperature construction method for using the above-mentioned solid waste-based bio-regenerated emulsified asphalt, characterized by comprising the following steps: (a) Segmented mixing: By weight, take 100 parts of RAP material, 3-5 parts of solid waste-based bio-recycled emulsified asphalt, 1-3 parts of solid waste-based cementitious material and 3-6 parts of total water, and mix them at room temperature; (b) Paving and compaction: The mixed cold recycled asphalt is quickly transported to the construction site at room temperature and paved using a paver, with the paving speed controlled at 2m. 2 / min~4m 2 / min; (c) Curing: After compaction, the regenerated layer is sealed and cured until the core sample is intact and the moisture content is less than 2% before traffic is opened.

[0021] This low-temperature construction method achieves a balance between high performance, low cost, and ultra-low carbon emissions through a segmented mixing process and material synergistic design. Solid waste-based cementitious materials play a dual role in this scheme: firstly, a small amount is added to the emulsified asphalt as a stabilizing component; secondly, the main component is added as an independent cementitious material in stages with water during construction mixing. This design allows the cementitious material to fully utilize its hydraulic properties in the mixture, generating a gel through hydration reactions. This gel interweaves with the asphalt film to form a spatial network structure, significantly improving the early strength and final mechanical properties of the mixture. This overcomes the inherent defects of traditional cold recycling technology, such as slow strength development and reliance on long curing times. The entire construction process is carried out at ambient temperature, avoiding the high energy consumption and asphalt aging problems of hot recycling processes, while simultaneously achieving the resource utilization of RAP, industrial solid waste, and biological waste oil.

[0022] Preferably, in step (a) of the above-mentioned low-temperature construction method, the mixing adopts a segmented mixing process: Dry mixing: Add the RAP material and all the solid waste-based cementitious materials into the mixing tank and dry mix for 15~30 seconds to make the cementitious materials evenly dispersed and adhered to the surface of the RAP material; Initial wet mixing: Add the solid waste-based bio-regenerated emulsified asphalt and water accounting for 60%~70% of the total water volume, mix for 60s~90ss to make the material initially uniform; Adjusting wet mixing: Add the remaining water and mix for 30-60 seconds to adjust the mixture to the optimal workability, resulting in a cold recycled mixture with a uniform appearance and no white speckles.

[0023] The segmented mixing process, through the sequence of "dry mixing-wet mixing-adjustment", completely solves the problem of uneven mixing of multi-source solid waste materials, ensuring the uniform distribution and efficient coating of RAP material, cementitious materials and emulsified asphalt.

[0024] Preferably, in step (b) of the above-mentioned low-temperature construction method, the compaction includes initial compaction, intermediate compaction and final compaction; the intermediate compaction is performed by rolling with a road roller, the initial compaction is performed by static compaction once and vibratory compaction once with a double-drum road roller, the intermediate compaction is performed by rolling with a pneumatic tire roller 3 to 4 times, and the final compaction is performed by static compaction once and twice with a double-drum road roller to eliminate wheel tracks.

[0025] Compared with existing technologies, the beneficial effects of this invention are as follows: This invention achieves efficient resource utilization of multi-source solid waste, including RAP, industrial solid waste (slag, fly ash), and biological waste oil, through the synergistic effect of biomass regenerators and solid waste-based cementitious materials. The prepared emulsified asphalt can achieve efficient recycling of high-proportion aged asphalt at low temperatures. Its cold-recycled mixture has high early strength, a significantly shortened curing cycle, and road performance close to that of hot-mix asphalt, meeting the paving requirements of various road grades. The entire preparation and construction process is carried out at room temperature or low temperature, fundamentally avoiding the energy consumption and high-temperature aging problems of hot recycling processes, achieving ultra-low carbon emissions. This invention possesses significant advantages in terms of high performance, low cost, and environmental friendliness. Detailed Implementation

[0026] The present invention will be further described below with reference to specific embodiments, wherein Embodiment 1 is the preferred embodiment. Example 1

[0027] The raw material composition by weight in this example is as follows: 100 parts asphalt component (where the mass ratio of new asphalt to old asphalt extracted from RAP is 20:80), 10 parts biomass regeneration agent obtained by filtering waste cooking oil through a 100-mesh sieve, and 3 parts solid waste-based cementitious material (composed of materials with a specific surface area of ​​450 m²). 2 / kg of blast furnace slag powder and fly ash are compounded at a mass ratio of 45:55), 2 parts of slow-cracking and fast-setting cationic asphalt emulsifier (Redicote E-7000 and Redicote E-6945 are compounded at a weight ratio of 3:1), 0.06 parts of calcium chloride co-emulsifier, and 100 parts of water.

[0028] Preparation process: (1) Mix 70% of new asphalt with all old asphalt at 150°C to obtain mixed asphalt; (2) Mix water, emulsifier, calcium chloride, biomass regenerator and solid waste-based cementitious material, and adjust the pH value to 2.5 with hydrochloric acid to obtain soap solution; (3) Adopt a pilot emulsification strategy: first, pre-shear and mix the remaining 30% of new asphalt with soap solution at a speed of 4000 r / min for 1 min to form a pre-emulsified environment; then add the mixed asphalt from step (1) and continue to shear at a speed of 4000 r / min for 10 min to obtain high-performance solid waste-based bio-regenerated emulsified asphalt.

[0029] Low-temperature construction using emulsified asphalt in this embodiment: Take 100 parts of RAP material, 4 parts of emulsified asphalt in this embodiment, 2 parts of the aforementioned solid waste-based cementitious material, and 5 parts of total water. First, dry mix the RAP material and the additional cementitious material for 20 seconds; then add the emulsified asphalt and 70% of the water, and wet mix for 75 seconds; finally, add the remaining 30% of the water, adjust the wet mixing for 45 seconds, and obtain a mixture with excellent workability. After paving, compact according to the process of initial compaction (one pass of static compaction with double steel drums + one pass of vibratory compaction), intermediate compaction (three passes of treadmill compaction), and final compaction (one pass of static compaction with double steel drums), and open to traffic after curing until the moisture content is below 2%. Example 2

[0030] The raw material composition by weight is as follows: 100 parts asphalt component (new asphalt: old asphalt = 10:90), 5 parts biomass regeneration agent (acid-refined oil, a byproduct of vegetable oil refining) (accounting for 5.6% of the old asphalt mass), and 1 part solid waste-based cementitious material (slag powder: fly ash = 40:60, specific surface area 400 m²). 2 / kg), 1 part of slow-cracking, fast-setting cationic asphalt emulsifier (Redicote E-7000 and Redicote E-6945 mixed in a weight ratio of 2:1), and 80 parts of water. During the preparation process, the mixing temperature in step (1) is 140℃, and the high-speed shearing speed in step (3) is 3000 r / min, with a time of 15min. During construction, the amount of emulsified asphalt is 3 parts, the amount of additional cementitious material is 1 part, and the total amount of water is 3 parts. Other process conditions are the same as in Example 1. Example 3

[0031] The raw material composition by weight is as follows: 100 parts asphalt component (new asphalt: old asphalt = 30:70), 12 parts biomass regeneration agent (accounting for 17.1% of the mass of old asphalt, slightly higher than the preferred range to verify the boundary), and 5 parts solid waste-based cementitious material (slag powder: fly ash = 50:50, specific surface area 500 m²). 2 / kg), 3 parts of slow-cracking, fast-setting cationic asphalt emulsifier (Redicote E-7000 and Redicote E-6945 mixed in a weight ratio of 3:1), and 120 parts of water. During the preparation process, the mixing temperature in step (1) is 160℃, and the high-speed shearing speed in step (3) is 4500 r / min for 5 min. During construction, the amount of emulsified asphalt is 5 parts, the amount of additional cementitious material is 3 parts, and the total amount of water is 6 parts. Other process conditions are the same as in Example 1. Example 4

[0032] The raw material ratio is exactly the same as in Example 1, but in step (3) of the preparation method, the pilot emulsification strategy is not adopted. Instead, the mixed asphalt from step (1) and the remaining new asphalt are mixed with soap solution at one time, and then high-speed shear emulsification is carried out under the same parameters (4000 r / min, 10 min). Example 5

[0033] The raw material ratio is basically the same as in Example 1, except that the amount of biomass regeneration agent is adjusted to 8 parts (8% of the mass of old asphalt). Example 6

[0034] The raw material ratio is basically the same as in Example 1, except that the raw material weight composition is as follows: 100 parts asphalt component (new asphalt: old asphalt = 10:90), 9 parts biomass regenerator, 4 parts solid waste-based cementitious material (slag powder: fly ash = 40:60), slow-cracking fast-setting cationic asphalt emulsifier (Redicote E-7000 and Redicote E-6945 are mixed at a weight ratio of 3:1), and 110 parts water. In the preparation process, in step (1), 60% of the new asphalt (i.e., 6% of the total mass of the asphalt component) is mixed with all the old asphalt at 140°C; in step (3), the high-speed shearing speed is 4200 r / min and the time is 12 minutes. During construction, the amount of emulsified asphalt is 5 parts and the amount of additional cementitious material is 2.5 parts. Example 7

[0035] Its formula and preparation process are the same as in Example 1, the only difference being that: the solid waste-based cementitious material uses steel slag micro powder (specific surface area 430 m²). 2 / kg) and coal gangue powder (specific surface area 460 m²) 2 The mixture of steel slag powder and coal gangue powder (at a mass ratio of 50:50) was used to replace the slag powder and fly ash in the original formula. Test results showed that the cementitious material made by combining steel slag powder and coal gangue powder had good hydration activity and interfacial bonding performance. The emulsified asphalt prepared was stable in storage, and the 7-day unconfined compressive strength of the recycled mixture could reach more than 95% of that in Example 1. Example 8

[0036] The raw material composition by weight is as follows: 100 parts asphalt component (new asphalt: old asphalt = 25:75), 8.5 parts biomass regeneration agent, 2 parts solid waste-based cementitious material, 1 part slow-cracking fast-setting cationic asphalt emulsifier (Redicote E-7000 and Redicote E-6945 mixed in a weight ratio of 3:1), and 90 parts water. In the preparation method, to compensate for the low emulsifier dosage, the high-speed shearing speed in step (3) is increased to 4500 r / min, and the shearing time is appropriately extended to 15 min to ensure the stability of the emulsion. The construction parameters are the same as in Example 1.

[0037] Comparative Example 1 The same RAP material and new asphalt from the same source and proportion as in Example 1 were used, but emulsified asphalt was not prepared. Instead, the RAP material was heated to 160°C and then mixed with new asphalt heated to 180°C and 10 parts of biomass recycling agent (same as in Example 1) at high temperature to obtain a hot recycled mixture, which was then paved and compacted at high temperature.

[0038] Comparative Example 2 Cold recycling was performed using conventional emulsified asphalt (without biomass recycler or solid waste-based cementitious materials). The preparation and construction methods were the same as in Example 1, but the emulsified asphalt contained only asphalt, emulsifier, and water, and no additional solid waste-based cementitious materials were added during construction mixing.

[0039] Comparative Example 3 The raw material ratio and preparation method are the same as in Example 1, but no biomass regenerator is added when preparing soap solution in step (2).

[0040] Comparative Example 4 The raw material ratio and preparation method are the same as in Example 1, but no solid waste-based cementitious material is added in the preparation of soap solution in step (2) and during the construction process.

[0041] Table 1: Performance Test Results of Solid Waste-Based Bio-Regenerated Emulsified Asphalt (Test Standard: JTG E20-2011) .

[0042] Table 1 Results Analysis: In the embodiments of this invention, the prepared emulsified asphalt met all the specifications, and the penetration and ductility of the evaporation residue (i.e., the regenerated asphalt) were significantly better than those of the comparative example, indicating that the biomass regenerator effectively restored the flexibility and crack resistance of the old asphalt. In Comparative Example 3, no regenerator was used, and the asphalt ductility decreased significantly, indicating that the properties of the aged asphalt were not effectively restored. Comparative Example 1 used hot recycling, and the asphalt showed obvious hardening (low penetration, high softening point), confirming secondary aging caused by high temperature.

[0043] Table 2: Test Results of Road Performance of Cold Recycled Mixture .

[0044] The test standards for Marshall stability and flow value are JTG E20 T0709; the test standard for splitting strength (15℃) is JTG E20 T0716; the test standard for wet-dry splitting strength ratio is JTG E20 T0716; the test standard for dynamic stability (60℃) is JTG E20 T0719; and the test standard for unconfined compressive strength (7d) is JTG E51 T0805.

[0045] Table 2 Results Analysis: Early strength advantage: The 7-day unconfined compressive strength of each embodiment of the present invention is much higher than that of comparative examples 2, 3 and 4. This is due to the hydration enhancement effect of the solid waste-based cementitious material, which enables rapid curing.

[0046] Excellent overall road performance: Example 1 has the best overall performance. Its stability, splitting strength, water stability and rutting resistance (dynamic stability) all surpass the conventional cold recycling of Comparative Example 2, and reach or even approach the level of hot recycling used in Comparative Example 1. This proves that the present invention has both the low carbon advantage of cold recycling and the high performance of hot recycling.

[0047] Synergistic effect of components: Comparative Example 3, which lacks regenerator, has lower strength; Comparative Example 4, which lacks cementitious material, has the worst early strength and water stability, confirming that the synergistic effect of biomass regenerator and solid waste-based cementitious material is the core of the success of this scheme.

[0048] Process optimization effect: The performance of Example 4 using one-time emulsification was slightly lower than that of the best Example 1, which proves the superiority of the "lead emulsification" strategy.

[0049] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A solid waste based bio-regenerated emulsified asphalt, characterized by, The raw material weight parts composition includes asphalt component 100 parts, biomass regenerant 5-12 parts, solid waste-based cementitious material 1-5 parts, emulsifier 1-3 parts and water 80-120 parts; The asphalt component includes new asphalt and old asphalt in waste asphalt pavement material; the mass ratio of new asphalt to old asphalt is 10-30:70-90; The biomass regenerant is waste biological oil; The solid waste-based cementitious material comprises a compound of blast furnace slag powder and fly ash, wherein the mass ratio of blast furnace slag powder to fly ash is 40-50:50-60, and the specific surface area of blast furnace slag powder and fly ash is controlled at 400m 2 / kg-500m 2 / kg.

2. The solid waste-based bio-regenerated emulsified asphalt according to claim 1, characterized in that, The biomass regenerant accounts for 5%-12% of the mass of the old asphalt; The biomass regenerant is waste oil recovered from the catering industry, which is filtered to remove solid impurities before use; the mesh number of the filter screen during filtering treatment is 80-150; The biomass regenerant is a byproduct generated in the process of refining vegetable oil, including but not limited to acid refining oil, soap foot or deodorized distillate.

3. The solid waste-based bio-regenerated emulsified asphalt according to claim 1, characterized in that, The emulsifier is a slow-cracking and fast-setting cationic asphalt emulsifier.

4. The solid waste-based bio-regenerated emulsified asphalt as claimed in claim 1, wherein, The raw material further includes an auxiliary emulsifier and a pH regulator; the auxiliary emulsifier is calcium chloride, which accounts for 1%-5% of the mass of the emulsifier; the pH regulator is hydrochloric acid or phosphoric acid.

5. The method for preparing solid waste-based bio-regenerated emulsified asphalt according to any one of claims 1-4, characterized in that, The method includes the following steps: (1) preparing mixed asphalt: mixing % of new asphalt with all the old asphalt at 140-160°C to obtain mixed asphalt; (2) preparing soap solution: mixing water, emulsifier, biomass regenerant and solid waste-based cementitious material, and adjusting the pH value to 2-3 with a pH regulator to obtain a soap solution; (3) synchronously emulsifying and regenerating: co-emulsifying the mixed asphalt obtained in step (1), the remaining new asphalt and the soap solution obtained in step (2) at high speed to obtain the solid waste-based bio-regenerated emulsified asphalt.

6. The method of claim 5, wherein the solid waste based bio-regenerated emulsified asphalt is prepared by the steps of: In step (3), the rotation speed of high-speed shearing emulsification is 3000-4500 r / min, and the shearing time is 5-15 min.

7. The method for preparing solid waste-based bio-regenerated emulsified asphalt according to claim 5, characterized in that, In step (3), the specific process of high-speed shearing emulsification is: first, the part of new asphalt is preliminarily mixed with the soap solution to form an emulsification environment, and then the mixed asphalt is added for high-speed shearing.

8. A low-temperature construction method using the solid-waste-based bio-regenerated emulsified asphalt according to any one of claims 1 to 4, characterized by, The method includes the following steps: (a) segmental mixing: taking RAP material 100 parts, solid waste-based bio-regenerated emulsified asphalt 3-5 parts, solid waste-based cementitious material 1-3 parts and total water 3-6 parts by weight parts, and mixing at room temperature; (b) paving and compaction: the mixed cold recycled mixture is rapidly transported to the construction site at normal temperature, paving is carried out by using a paver, and the paving speed is controlled at 2m 2 / min~4m 2 / min.

9. The cryogenic construction method of claim 8, wherein, In step (a), the mixing adopts a segmental mixing process: First, the coarse aggregate, part of the water, part of the solid waste-based bio-regenerated emulsified asphalt and part of the solid waste-based cementitious material are mixed in the first segment; Then, the fine aggregate, mineral powder and the remaining solid waste-based bio-regenerated emulsified asphalt and solid waste-based cementitious material are mixed in the second segment; Finally, the remaining water is added for the third segment to adjust the workability.

10. The cryogenic construction method of claim 8, wherein, In step (b), the compaction includes initial compaction, recompaction and final compaction; the recompaction adopts kneading compaction by a road roller.