WO2022027778A1 - High-efficiency reclaimed asphalt mixture and preparation process thereof - Google Patents

Abstract

Disclosed is a high-efficiency reclaimed asphalt mixture, comprising in terms of parts by mass a reclaimed dedicated asphalt and 100 parts of a core material. The 100 parts of the core material comprise the following raw materials in terms of parts by mass: 0-30 parts of a newly aggregated material of which the particle size is 10 mm to 25 mm, 0-70 parts of a RAP material of which the particle size is 10 mm to 20 mm, 0-80 parts of a RAP material of which the particle size is 5 mm to 10 mm, 0-20 parts of a RAP material of which the particle size is 0 mm to 5 mm, and 0-3 parts of a mineral powder. Also provided in the present invention is a preparation process for the high-efficiency reclaimed asphalt mixture. In the product high-efficiency reclaimed asphalt mixture of the present invention, the blending ratio of the RAP materials can be 70% or more, mixing entirely in a reclamation plant can be attained at best, and this is applicable in various grades of road surfaces.

Description

A kind of high-efficiency recycled asphalt mixture and its preparation process technical field

The invention relates to an asphalt mixture, in particular to a high-efficiency asphalt regeneration mixture and a preparation process thereof.

Background technique

my country's highway development is changing from an era of equal emphasis on construction and maintenance to the era of maintenance. Road maintenance produces hundreds of millions of cubic meters of waste materials every year, which need to be disposed of and utilized, causing huge pressure on the ecological environment. If waste materials are disposed of as waste in landfills, it will take up a huge amount of storage space. If the waste asphalt mixture is simply mechanically treated as the subgrade cushion, the function of the waste asphalt mixture cannot be fully exerted, resulting in a serious waste of resources. Therefore, recycling this waste material for reuse will save a lot of cost and have important economic and social value.

The implementation process of asphalt pavement regeneration technology is to firstly excavate and mill the old asphalt pavement that needs to be renovated or discarded to obtain waste asphalt mixture, and then combine it with new aggregates, new asphalt (need to add regenerant if necessary) and other materials. Re-mix to form a recycled asphalt mixture with certain road performance, and the regenerated asphalt mixture can be used for laying the surface layer or base layer of the asphalt pavement.

Among all asphalt pavement recycling technologies, in the production process of factory-mixed hot recycled mixture, the old material is firstly crushed, screened and classified, and its variability is effectively controlled; secondly, the mixing process of hot recycled mixture is similar to conventional The hot mix is carried out at a higher mixing temperature, so the old asphalt in the waste asphalt mixture is easier to fuse with the new asphalt and rejuvenating agent, and the regeneration effect of the old asphalt is good. After multi-step control of waste asphalt mixture pretreatment and accurate metering, old asphalt regeneration, new aggregate and new asphalt configuration on demand, the produced factory-mixed hot recycled mixture has the best performance and is easy to control, and the uniformity of the mixture Well, it has the widest scope of application. It can not only be used in the middle and lower layers of the road and the base layer, but also can be used in the upper layer of the road after a reasonable design and inspection. The disadvantage is that the waste asphalt mixture needs to be transported to the mixing plant, which increases the transportation cost of the pellets, and the content of the waste asphalt mixture is lower than that of the cold recycling technology, generally 10%-30%, which has become an obstacle to the widespread application of this technology. bottleneck. However, since 2010, with the research of super regeneration technology in France, more than 80%, or even 100% of the regeneration dosage technology has been applied to engineering practice. Therefore, this project takes factoryization, industrialization, and high-efficiency thermal regeneration as the main research direction. .

Researchers at home and abroad have carried out a lot of research on the design and construction technology of recycled mixtures, and have achieved corresponding research results. However, due to the differences in the test materials and test equipment used by the researchers, the research conclusions are inconsistent and even contradict each other. At the same time, due to the unrefined test and design method, the designed thermal regeneration mixture has a low content of old materials, a low effective regeneration rate of the old materials, high content of new asphalt or regenerant to be added, and unstable quality of the recycled mixture. , The poor road performance of the recycled mixture reduces the economic advantage of the recycled mixture and seriously affects the industrialization and large-scale implementation of thermal regeneration technology. The invention provides a high-efficiency recycled asphalt mixture and a preparation process thereof, which can break through key problems such as classification of recycled materials, special recycled asphalt, mixture design, production, and matching of construction equipment, etc. The performance of the mixed material reaches the level of the new material, and the unit cost is lower than the target of the new material, so as to promote the industrialized utilization of road waste materials, improve the recycling efficiency of waste materials, consolidate the leading position of Jiangsu Province in the level of highway construction and maintenance in the country, and promote highway construction and maintenance. High-quality development of the industry.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a hot-mixed high-efficiency recycled asphalt mixture with high regeneration rate, low production cost, excellent high and low temperature and fatigue properties of the mixture and its preparation process.

In order to realize the above-mentioned purpose of the invention, the concrete technical scheme adopted in the present invention is:

A high-efficiency recycled asphalt mixture is characterized in that it comprises 1.0 to 3.0 parts by mass of special recycled asphalt and 100 parts of aggregate;

The 100 parts of aggregates include raw materials in the following proportions by mass: 0 to 30 parts of new aggregates with a particle size of 10mm to 25mm, 0 to 70 parts of RAP materials with a particle size of 10mm to 20mm, and a particle size of 5mm to 5mm. 0-80 parts of 10mm RAP material, 0-20 parts of RAP material with a particle size of 0mm-5mm, and 0-3 parts of mineral powder.

Preferably, the new aggregate is limestone or basalt with a particle size of 10-25 mm.

The regenerated special asphalt is composed of matrix asphalt, styrene-containing modifier, multi-chain polyolefin modifier, rubber oil, naphthenic oil regenerant, and stabilizer:

The mass percentages of the components of the base asphalt, styrene-containing modifier, multi-chain polyolefin modifier, rubber oil, naphthenic oil regenerant, and stabilizer are as follows:

The styrene-containing modifier is one or both of styrene-butadiene-styrene triblock copolymer SBS and styrene-butadiene rubber SBR.

The multi-chain polyolefin type modifier is oxidized polyethylene wax, the melting point is 100-150°C, the viscosity at 140°C is 200-5000cps, and the acid value is 14-55mg KOH/g.

Described regenerant is a kind of in naphthenic oil or aromatic base oil

The rubber oil is one of naphthenic rubber oil and aromatic rubber oil.

The stabilizer is one of elemental sulfur, diaryl disulfide and nitro-substituted diaryl disulfide.

The preparation method of the regenerated special asphalt comprises the following steps:

(1) Heat the base asphalt to 165-180°C in the reaction kettle, add styrene-containing modifier after the temperature is stable, stir for 0.5-1 h until it is uniform, and pass the uniformly stirred asphalt to high-speed shearing through a colloid mill. Cut, the shearing power is 20~40t/h; after the shearing is completed, stir for 0.5h~1h; then add the multi-chain polyolefin modifier, and continue to stir for 0.5~1h;

(2) Adding rubber oil to the asphalt obtained in step (1), stirring at 170-180°C for 0.5h-1h; then slowly adding stabilizer, stirring for 2-3h, then adding at 170-180°C The regenerant is continuously stirred for 8h to 24h, and then the material is discharged and filled to obtain the product.

The present invention also provides a process for preparing high-efficiency regenerated asphalt mixture, which is characterized by comprising the following steps:

Step 1: The RAP material is planed, milled and crushed, and divided into three grades: 20-10mm RAP aggregate, 10-5mm RAP aggregate, and less than 5mm RAP aggregate, or 20-10mm RAP aggregate and 10-0mm RAP aggregate;

Step 2: heating the new aggregate and mineral powder in the first drying cylinder of the gas heating method;

Step 3: Heat the third (or two) RAP material in the second drying cylinder of the gas heating method;

Step 4: After measuring, put the new aggregate, mineral powder, and third-speed (or second-speed) RAP material into the mixing pot, and stir evenly;

Step 5, adding recycled special asphalt into the mixing pot and stirring evenly to obtain a high-efficiency recycled asphalt mixture.

Further, the planing, milling and crushing method in the step 1 is a milling machine + crushing and screening.

Further, in the step 2, the heating method in the first drying cylinder is that the new aggregate is heated in the drying cylinder of the original stirring device, and the dried hot air is introduced into the drying cylinder, and the convection between the aggregate and the gas is realized in the drying cylinder. ; There is an induced draft fan at the other end of the drying cylinder, which draws the heated gas back to the heat generator, which is conducive to the reuse of heat energy.

Further, in the second step, the heating temperature in the first drying cylinder is 170°C to 185°C.

Further, the heating method in the second drying cylinder in the third step is to adopt a downstream heating method, and the dried hot air is introduced into the old asphalt mixture drying cylinder, and the convection of the mixture and the gas is realized in the drying cylinder; There is an induced draft fan at the other end of the drying cylinder, which draws the heated gas back to the heat generator. The recovered gas may have "blue smoke" and water vapor from heating. Therefore, before entering the hot gas generator, the water vapor is separated to ensure the drying of the gas, and the "blue smoke" produced is burned by reheating, which can not only prevent pollution, but also generate heat energy.

Further, in the third step, the heating temperature in the second drying cylinder is 120°C to 140°C.

Further, the stirring equipment in the step 4 adopts intermittent forced stirring equipment.

Further, the stirring device in the fourth step is a heating-type stirring device, so that the regenerated mixture can reach the discharge temperature uniformly.

Further, the temperature of the recycled special asphalt in the step 5 is 165°C to 180°C.

Further, the stirring temperature in the fifth step is 130°C to 150°C.

A high-efficiency regenerated asphalt mixture and a preparation process thereof provided by the present invention have the following beneficial effects:

The asphalt used in the high-efficiency regenerated asphalt mixture provided by the present invention is a self-developed special cementing material for regeneration, which contains a multi-chain polyolefin modifier and a naphthenic oil regenerating agent, which can significantly improve the high and low temperature performance and regeneration performance of the asphalt. The multi-chain polyolefin modifier and SBS copolymer can be combined into a new graft copolymer. This copolymer has high polarity and can form a uniform structure with no phase separation from the asphalt, effectively improving the stability of the asphalt. properties, high temperature rheology and temperature sensitivity. The naphthenic oil regenerant used in the present invention has good compatibility, has good dispersibility for insoluble sulfides, and has remarkable reconciliation and regeneration performance for asphalt components. And it has good stability, no pollution and no toxicity, which can reduce environmental pollution during use and improve the protection of the environment.

Secondly, the high-efficiency recycled asphalt mixture provided by the present invention aims at the disadvantages of the existing recycled mixture design, which is the first volume design and then the mixture performance verification. The Asphalt Mixture Design Method (LPC), which forms a performance balance-based method for the preparation of recycled asphalt mixtures. In the proportioning design, the gradation of the recycled asphalt mixture can be adjusted freely. Even the densely mixed mixture with extremely small porosity can ensure its high temperature performance due to the effect of the recycled special asphalt. The invention integrates the French high-modulus asphalt mixture design method (LPC) and the American asphalt mixture design method based on performance balance (BMD), and strives for more space for the synergistic improvement of the fatigue resistance and low temperature performance of the recycled asphalt mixture , fully guarantee the overall improvement of the overall performance of the recycled mixture.

detailed description

Hereinafter, the technical solutions of the present invention will be described in detail through specific embodiments.

Example 1

High-efficiency recycled asphalt mixture, including by weight: 2 parts of recycled special asphalt, 20 parts of new aggregates with a particle size of 10mm to 20mm, 45 parts of RAP material with a particle size of 10mm to 20mm, and a particle size of 5mm to 10mm. 30 parts of RAP material and 5 parts of RAP material with a particle size of 0 mm to 5 mm.

The high-efficiency recycled asphalt mixture is SMA-13 type asphalt mixture.

The new aggregate added to the high-efficiency regenerated asphalt mixture is basalt with a particle size of 10 mm to 20 mm.

The RAP material added to the high-efficiency recycled asphalt mixture is the SMA-13 waste asphalt mixture recovered by milling.

The preparation method of high-efficiency regenerated asphalt mixture is characterized in that, specifically comprises the following steps:

Step 1: Planing, milling and crushing the SMA-13 waste asphalt mixture into three blocks: 20-10mm RAP aggregate, 10-5mm RAP aggregate, and less than 5mm RAP aggregate;

Step 2: heating 20 parts of new aggregates of 10mm to 20mm in the first drying cylinder of the gas heating method, and the heating temperature is 170°C;

Step 3: Put 45 parts of RAP material with a particle size of 10mm to 20mm, 30 parts of RAP material with a particle size of 5mm to 10mm, and 5 parts of RAP material with a particle size of 0mm to 5mm in the second stage of the gas heating method. Heating in the drying cylinder, the heating temperature is 130 ℃;

Step 4: Put the new aggregate and the third-speed RAP material into the mixing pot and stir evenly;

Step 5: Add 175°C regenerated special asphalt into the stirring pot and stir evenly to obtain high-efficiency regenerated asphalt mixture 1#, and the stirring temperature is 140°C.

Take the high-efficiency recycled asphalt mixture 1# to measure the stability, flow value, dynamic stability and low temperature trabecular. The test results are shown in Table 1.

Table 1 Test results of 1# high-efficiency recycled asphalt mixture

The test results in Table 1 show that the high temperature performance of 1# recycled asphalt mixture is excellent, the stability is increased from 7.8kN to 12.54kN, and the dynamic stability is increased from 4238 times/mm to 9545 times/mm. In terms of low temperature, the low temperature crack resistance of the mixture is basically restored, and the maximum bending and tensile strain at low temperature is increased from 1972 με to 2299 με. The improvement of high and low temperature performance shows that the regeneration effect of 1# recycled asphalt mixture is good.

Example 2

The high-efficiency recycled asphalt mixture includes, in parts by weight: 2.2 parts of recycled special asphalt, 60 parts of RAP material with a particle size of 10mm to 20mm, 30 parts of RAP material with a particle size of 5mm to 10mm, and RAP with a particle size of 0mm to 5mm 10 servings.

The high-efficiency regenerated asphalt mixture is AC-20 type fully regenerated asphalt mixture.

The RAP material added to the high-efficiency recycled asphalt mixture is the AC-20 type waste asphalt mixture recovered by milling.

The preparation method of high-efficiency regenerated asphalt mixture is characterized in that, specifically comprises the following steps:

Step 1: Plan, mill and crush the AC-20 waste asphalt mixture, and divide it into three blocks: 20-10mm RAP aggregate, 10-5mm RAP aggregate, and less than 5mm RAP aggregate;

Step 2: put 45 parts of RAP material with a particle size of 10mm to 20mm, 30 parts of RAP material with a particle size of 5mm to 10mm, and 5 parts of RAP material with a particle size of 0mm to 5mm in the second stage of the gas heating method. Heating in the drying cylinder, the heating temperature is 140 ℃;

Step 3: Put the third gear RAP material into the mixing pot and stir evenly;

Step 5: Add 175°C regenerated special asphalt into the mixing pot and stir evenly to obtain high-efficiency regenerated asphalt mixture 2#, and the stirring temperature is 140°C.

Take the high-efficiency recycled asphalt mixture 2# to measure the stability, flow value, dynamic stability and low temperature trabecular. The test results are shown in Table 2.

Table 2 Test results of 2# high-efficiency recycled asphalt mixture

The test results in Table 2 show that the high temperature performance of the 2# recycled asphalt mixture has been improved, the stability has increased from 5.6kN to 8.72kN, and the dynamic stability has increased from 4500 times/mm to 6387 times/mm. The low temperature is slightly improved, and the maximum bending and tensile strain at low temperature is increased from 1412με to 1514με. The 2# recycled asphalt mixture implemented this time is a fully recycled asphalt mixture, and its regeneration effect is slightly improved.

Example 3

High-efficiency recycled asphalt mixture, including by weight: 2 parts of recycled special asphalt, 20 parts of new aggregates with a particle size of 10mm to 20mm, 45 parts of RAP material with a particle size of 10mm to 20mm, and a particle size of 5mm to 10mm. 30 parts of RAP material and 5 parts of RAP material with a particle size of 0 mm to 5 mm.

The high-efficiency regenerated asphalt mixture is AC-20 type asphalt mixture.

The new aggregate added to the high-efficiency regenerated asphalt mixture is limestone with a particle size of 10 mm to 20 mm.

The RAP material added to the high-efficiency recycled asphalt mixture is AC-20 waste and old asphalt mixture recovered by milling.

The preparation method of high-efficiency regenerated asphalt mixture is characterized in that, specifically comprises the following steps:

Step 1: Plan, mill and crush the AC-20 waste asphalt mixture, and divide it into three blocks: 20-10mm RAP aggregate, 10-5mm RAP aggregate, and less than 5mm RAP aggregate;

Step 2: heating 20 parts of new aggregates of 10mm to 20mm in the first drying cylinder of the gas heating method, and the heating temperature is 170°C;

Step 3: Put 45 parts of RAP material with a particle size of 10mm-20mm, 30 parts of RAP material with a particle size of 5mm-10mm, and 5 parts of RAP material with a particle size of 0mm-5mm in the second stage of the gas heating method. Heating in the drying cylinder, the heating temperature is 140 ℃;

Step 4: Put the new aggregate and the third-speed RAP material into the mixing pot and stir evenly;

Step 5: Add 175°C regenerated special asphalt into the stirring pot and stir evenly to obtain high-efficiency regenerated asphalt mixture 3#, and the stirring temperature is 140°C.

Take high-efficiency recycled asphalt mixture 3# to measure the stability, flow value, dynamic stability and low temperature trabecular. The test results are shown in Table 3.

Table 3 Test results of 3# high-efficiency recycled asphalt mixture

Test items	unit	High-efficiency recycled mixture 3# test results	Original AC road test results
stability	kN	8.43	5.60
flow value	0.1mm	45.2	44.5
Maximum bending strain at low temperature	με	1887	1412
Dynamic stability	times/mm	8750	4500

The test results in Table 3 show that the 3# recycled asphalt mixture has excellent high temperature performance, the stability is increased from 5.6kN to 8.43kN, and the dynamic stability is increased from 4500 times/mm to 8750 times/mm. In terms of low temperature, the low temperature crack resistance of the mixture is basically restored, and the maximum flexural tensile strain at low temperature is increased from 1412 με to 1887 με. The improvement of high and low temperature performance shows that the regeneration effect of 3# recycled asphalt mixture is good.

Example 4

High-efficiency recycled asphalt mixture, including by weight: 2 parts of recycled special asphalt, 20 parts of new aggregates with a particle size of 10mm to 20mm, 44 parts of RAP material with a particle size of 10mm to 20mm, and a particle size of 5mm to 10mm. 30 parts of RAP material, 5 parts of RAP material with a particle size of 0mm to 5mm, and 1 part of mineral powder.

The high-efficiency recycled asphalt mixture is AC-20 type asphalt mixture.

The new aggregate added to the high-efficiency regenerated asphalt mixture is limestone with a particle size of 10 mm to 20 mm.

The RAP material added to the high-efficiency recycled asphalt mixture is AC-20 waste and old asphalt mixture recovered by milling.

The preparation method of high-efficiency recycled asphalt mixture is characterized in that, specifically comprises the following steps:

Step 1: Plan, mill and crush the AC-20 waste asphalt mixture, and divide it into three blocks: 20-10mm RAP aggregate, 10-5mm RAP aggregate, and less than 5mm RAP aggregate;

Step 2: heating 20 parts of 10mm-20mm new aggregate and 1 part of mineral powder in the first drying cylinder of the gas heating method, and the heating temperature is 170 ° C;

Step 3: Put 44 parts of RAP material with a particle size of 10mm to 20mm, 30 parts of RAP material with a particle size of 5mm to 10mm, and 5 parts of RAP material with a particle size of 0mm to 5mm in the second stage of the gas heating method. Heating in the drying cylinder, the heating temperature is 140 ℃;

Step 4: Put the new aggregate, mineral powder and RAP material in the third gear into the mixing pot and stir evenly;

Step 5: Add 175°C regenerated special asphalt into the stirring pot and stir evenly to obtain high-efficiency recycled asphalt mixture 4#, and the stirring temperature is 140°C.

Take the high-efficiency recycled asphalt mixture 4# to measure the stability, flow value, dynamic stability and low temperature trabecular. The test results are shown in Table 4.

Table 4 Test results of 4# high-efficiency recycled asphalt mixture

Test items	unit	High-efficiency recycled mixture 4# test results	Original AC road test results
stability	kN	8.55	5.60
flow value	0.1mm	23.4	44.5
Maximum bending strain at low temperature	με	1821	1412
Dynamic stability	times/mm	9844	4500

The test results in Table 4 show that the high temperature performance of 4# recycled asphalt mixture is excellent, the stability is increased from 5.6kN to 8.55kN, and the dynamic stability is increased from 4500 times/mm to 9844 times/mm. In terms of low temperature, the low temperature crack resistance of the mixture is basically restored, and the maximum flexural tensile strain at low temperature is increased from 1412 με to 1821 με. The improvement of high and low temperature performance shows that the regeneration effect of 4# recycled asphalt mixture is good.

Example 5

High-efficiency recycled asphalt mixture, including by weight: 2 parts of recycled special asphalt, 25 parts of new aggregate with particle size of 10mm-15mm, 22 parts of RAP material with particle size of 10mm-20mm, particle size of 0mm-10mm 53 servings of RAP material.

The high-efficiency recycled asphalt mixture is AC-13 type asphalt mixture.

The new aggregate added to the high-efficiency regenerated asphalt mixture is limestone with a particle size of 10mm-15mm.

The RAP material added to the high-efficiency recycled asphalt mixture is AC-13 waste and old asphalt mixture recovered by milling.

The preparation method of high-efficiency regenerated asphalt mixture is characterized in that, specifically comprises the following steps:

Step 1: Plan, mill and crush the AC-13 waste asphalt mixture, and divide it into two blocks of 20-10mm RAP aggregate and 10-0mm RAP aggregate;

Step 2: heating 25 parts of new aggregates of 10mm to 15mm in the first drying cylinder of the gas heating method, and the heating temperature is 180°C;

Step 3: heating 22 parts of RAP material with a particle size of 10mm to 20mm and 53 parts of RAP material with a particle size of 0mm to 10mm in the second drying cylinder of the gas heating method, and the heating temperature is 135 ° C;

Step 4: Put the new aggregate and RAP material in two blocks into the mixing pot and stir evenly;

Step 5: Add 175°C regenerated special asphalt into the stirring pot and stir evenly to obtain high-efficiency regenerated asphalt mixture 5#, and the stirring temperature is 140°C.

Take high-efficiency recycled asphalt mixture 5# for stability, flow value, dynamic stability and low-temperature trabecular measurement. The test results are shown in Table 5.

Table 5 Test results of 5# high-efficiency recycled asphalt mixture

Test items	unit	High-efficiency recycled mixture 5# test results	Original AC road test results
stability	kN	10.51	5.60
flow value	0.1mm	37.6	44.5
Maximum bending strain at low temperature	με	2405	1412
Dynamic stability	times/mm	6058	4500

The test results in Table 5 show that the 5# recycled asphalt mixture has excellent high temperature performance, the stability is increased from 5.6kN to 10.51kN, and the dynamic stability is increased from 4500 times/mm to 6058 times/mm. In terms of low temperature, the low temperature crack resistance of the mixture is basically restored, and the maximum flexural tensile strain at low temperature is increased from 1412με to 2405με. The improvement of high and low temperature performance shows that the regeneration effect of 5# recycled asphalt mixture is good.

The above description is only an ideal embodiment of the present invention, but the scope of application of the present invention is not limited to this. Concepts, equivalent replacements and changes should be included within the protection scope of the present invention.

Claims (13)

1. A high-efficiency recycled asphalt mixture, characterized in that the high-efficiency recycled asphalt mixture comprises 1.0 to 3.0 parts by mass of special recycled asphalt and 100 parts of aggregate;

   The 100 parts of aggregates include raw materials in the following proportions by mass: 0 to 30 parts of new aggregates with a particle size of 10mm to 25mm, 0 to 70 parts of RAP materials with a particle size of 10mm to 20mm, and a particle size of 5mm to 5mm. 0-80 parts of 10mm RAP material, 0-20 parts of RAP material with a particle size of 0mm-5mm, and 0-3 parts of mineral powder.
2. The high-efficiency regenerated asphalt mixture according to claim 1, wherein the regenerated special asphalt is composed of matrix asphalt, styrene-containing modifier, multi-chain polyolefin modifier, rubber oil, naphthenic Composition of base oil regenerant and stabilizer:

   The mass percentages of the components of the base asphalt, styrene-containing modifier, multi-chain polyolefin modifier, rubber oil, naphthenic oil regenerant, and stabilizer are as follows:

   
3. The high-efficiency recycled asphalt mixture according to claim 1, wherein the new aggregate is limestone or basalt with a particle size of 10-25 mm.
4. A preparation process for high-efficiency regenerated asphalt mixture, characterized in that, the preparation process comprises the following steps:

   Step 1: The RAP material is planed, milled and crushed, and divided into three grades: 20-10mm RAP aggregate, 10-5mm RAP aggregate, and less than 5mm RAP aggregate, or 20-10mm RAP aggregate and 10-0mm RAP aggregate;

   Step 2: heating the new aggregate and mineral powder in the first drying cylinder of the gas heating method;

   Step 3: Heat the third (or two) RAP material in the second drying cylinder of the gas heating method;

   Step 4: After measuring, put the new aggregate, mineral powder, and third-speed (or second-speed) RAP material into the mixing pot, and stir evenly;

   Step 5, adding recycled special asphalt into the mixing pot and stirring evenly to obtain a high-efficiency recycled asphalt mixture.
5. The preparation process of a kind of high-efficiency regenerated asphalt mixture according to claim 4, it is characterized in that: the planing, milling and crushing method in the step 1 is raking+crushing and screening and milling machine+crushing and screening. A sort of.
6. The preparation process of a high-efficiency regenerated asphalt mixture according to claim 4, characterized in that: in the step 2, the heating method in the first drying cylinder is that the new aggregate is heated in the drying cylinder of the original stirring equipment, The dry hot air is introduced into the drying cylinder, and the convection between the aggregate and the gas is realized in the drying cylinder; there is an induced draft fan at the other end of the drying cylinder, which draws the heated gas back to the heat generator, which is conducive to the reuse of heat energy.
7. The preparation process of a high-efficiency regenerated asphalt mixture according to claim 4, wherein the heating temperature in the first drying cylinder in the second step is 170°C to 185°C.
8. The preparation process of a high-efficiency regenerated asphalt mixture according to claim 4, wherein the heating method in the second drying cylinder in the third step is to adopt a downstream heating method, and the dry hot air is introduced into the old The asphalt mixture drying cylinder realizes the convection between the mixture and the gas in the drying cylinder; there is an induced draft fan at the other end of the drying cylinder, which draws the heated gas back to the heat generator. The recovered gas may have "blue smoke" and water vapor from heating. Therefore, before entering the hot gas generator, the water vapor is separated to ensure the drying of the gas, and at the same time, the "blue smoke" produced is burned off by reheating, which can not only prevent pollution, but also generate heat energy.
9. The preparation process of a high-efficiency regenerated asphalt mixture according to claim 4, wherein the heating temperature in the second drying cylinder in the third step is 120°C to 140°C.
10. The preparation process of a high-efficiency regenerated asphalt mixture according to claim 4, characterized in that: the stirring equipment in the step 4 adopts intermittent forced stirring equipment.
11. The preparation process of a high-efficiency regenerated asphalt mixture according to claim 4, characterized in that: the stirring equipment in the step 4 is a heating type stirring equipment, so that the regenerated mixture can reach the discharge temperature uniformly.
12. The preparation process of a high-efficiency regenerated asphalt mixture according to claim 4, wherein the temperature of the regenerated special asphalt in the step 5 is 165°C to 180°C.
13. The preparation process of a high-efficiency regenerated asphalt mixture according to claim 4, wherein the stirring temperature in the step 5 is 130°C to 150°C.