CN112125575B - High-efficiency regenerated asphalt mixture and preparation process thereof - Google Patents
High-efficiency regenerated asphalt mixture and preparation process thereof Download PDFInfo
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Abstract
The invention discloses a high-efficiency recycled asphalt mixture, which comprises 1.0-3.0 parts by mass of recycled special asphalt and 100 parts by mass of aggregate; the 100 parts of aggregate comprises the following raw materials in parts by mass: 0-30 parts of new aggregate with the particle size of 10-25 mm, 0-70 parts of RAP material with the particle size of 10-20 mm, 0-80 parts of RAP material with the particle size of 5-10 mm, 0-20 parts of RAP material with the particle size of 0-5 mm and 0-3 parts of mineral powder. The invention also provides a preparation process of the high-efficiency recycled asphalt mixture. In the finished product of the high-efficiency regenerated asphalt mixture, the mixing proportion of the RAP material can reach more than 70 percent, the full-regeneration plant mixing can be realized to the maximum extent, and the high-efficiency regenerated asphalt mixture can be suitable for various pavement grades.
Description
Technical Field
The invention relates to an asphalt mixture, in particular to a high-efficiency asphalt regeneration mixture and a preparation process thereof.
Background
The development of roads in China is shifting from the times of building and maintenance to the times of maintenance, and road maintenance generates hundreds of millions of cubes of waste materials every year, and the waste materials need to be treated and utilized, so that huge ecological environment pressure is caused. If the waste materials are buried as waste garbage, huge stacking space is occupied. If the waste asphalt mixture is subjected to simple mechanical treatment to be used as a roadbed cushion, the functions of the waste asphalt mixture can not be fully exerted, and serious resource waste is caused. Therefore, the waste material is recycled, so that a large amount of cost is saved, and the method has important economic and social values.
The asphalt pavement regeneration technology is implemented by firstly digging and milling old asphalt pavement to be renovated or abandoned to obtain waste asphalt mixture, then re-mixing the waste asphalt mixture with new aggregate, new asphalt (a regenerant is added if necessary) and other materials to form regenerated asphalt mixture with certain pavement performance, and the regenerated asphalt mixture can be used for paving a surface layer or a base layer of the asphalt pavement.
In all the asphalt pavement regeneration technologies, in the production process of the hot mix plant recycling mixture, the old materials are firstly crushed and screened to be graded, and the variability of the old materials is effectively controlled; and secondly, the mixing process of the hot recycled mixture is similar to that of the conventional hot mixed mixture and is carried out at a higher mixing temperature, so that the old asphalt in the waste asphalt mixture is easier to be mixed with new asphalt and a regenerant, and the regeneration effect of the old asphalt is good. Through multi-step control of waste asphalt mixture pretreatment and accurate metering, waste asphalt regeneration, new aggregate and new asphalt configuration as required and the like, the produced hot mix plant recycling mixture has optimal performance, easy control, good uniformity of the mixture and the widest application range, not only can be used for middle and lower surface layers and base layers of roads, but also can be used for upper surface layers of roads through reasonable design and inspection. The defects that the waste asphalt mixture needs to be transported to a mixing plant, the transportation cost of the granules is additionally increased, and the mixing amount of the waste asphalt mixture is lower than that of a cold regeneration technology, generally 10-30%, so that the waste asphalt mixture becomes a bottleneck for inhibiting the wide application of the technology. However, since 2010, with the research of the super-regeneration technology of france, the technology of more than 80% and even 100% regeneration mixing amount has been applied to engineering practice, so the project takes the industrial, industrialized and high-efficiency thermal regeneration as the main research direction.
Researchers at home and abroad carry out a great deal of research on the design and construction technology of the recycled mixture and obtain corresponding research results, but due to the difference of test materials, test equipment and the like adopted by researchers, the research results are inconsistent and even contradictory, and meanwhile due to the non-refined test and design method, the designed heat-recycling mixture has low mixing amount of old materials, low effective recycling rate of the old materials, high content of new asphalt or recycling agent required to be added, unstable quality of the recycled mixture and poor road performance of the recycled mixture, so that the economic advantages of the recycled mixture are reduced, and the industrialization and large-scale implementation of the heat-recycling technology are seriously influenced. The high-efficiency regenerated asphalt mixture and the preparation process thereof provided by the invention can break through the key problems of classification of regenerated materials, special regenerated asphalt, design of the mixture, production, matching of construction equipment and the like, and realize the purposes that the consumption of milling materials reaches more than 70%, the performance of the regenerated mixture reaches the level of new materials, and the unit cost is lower than that of the new materials, thereby promoting the industrial utilization of road waste materials, improving the recycling efficiency of the waste materials, consolidating the leading position of the road building level of Jiangsu province in China, and promoting the high-quality development of the road industry.
Disclosure of Invention
The invention aims to provide a hot-mix high-efficiency recycled asphalt mixture with high recycling rate, low production cost, excellent high and low temperature and fatigue performance and a preparation process thereof.
In order to achieve the purpose, the invention adopts the following specific technical scheme:
the high-efficiency regenerated asphalt mixture is characterized by comprising 1.0-3.0 parts by mass of special regenerated asphalt and 100 parts by mass of aggregate;
the 100 parts of aggregate comprises the following raw materials in parts by mass: 0-30 parts of new aggregate with the particle size of 10-25 mm, 0-70 parts of RAP material with the particle size of 10-20 mm, 0-80 parts of RAP material with the particle size of 5-10 mm, 0-20 parts of RAP material with the particle size of 0-5 mm and 0-3 parts of mineral powder.
Preferably, the new aggregate is limestone or basalt with the particle size of 10-25 mm.
The special asphalt for regeneration consists of base asphalt, styrene-containing modifier, multi-chain polyolefin modifier, rubber oil, naphthenic oil regenerant and stabilizer:
the base asphalt, the styrene-containing modifier, the multi-chain polyolefin modifier, the rubber oil, the naphthenic oil regenerant and the stabilizer comprise the following components in percentage by mass:
the styrene-containing modifier is one or two of styrene-butadiene-styrene triblock copolymer SBS and styrene-butadiene rubber SBR.
The multi-chain polyolefin modifier is oxidized polyethylene wax, the melt drop point of the modifier is 100-150 ℃, the viscosity of the modifier is 200-5000 cps at 140 ℃, and the acid value of the modifier is 14-55 mg KOH/g.
The regenerant is one of naphthenic oil or aromatic oil
The rubber oil is one of naphthenic base rubber oil and aromatic base rubber oil.
The stabilizer is one of elemental sulfur, diaryl disulfide and nitro-substituted diaryl disulfide.
The preparation method of the special asphalt for regeneration comprises the following steps:
(1) heating the substrate asphalt to 165-180 ℃ in a reaction kettle, adding a styrene-containing modifier after the temperature is stable, stirring for 0.5-1 h until the mixture is uniform, and shearing the uniformly stirred asphalt at a high speed by a colloid mill with the shearing power of 20-40 t/h; stirring for 0.5-1 h after shearing; then adding a multi-chain polyolefin modifier, and continuously stirring for 0.5-1 h;
(2) adding rubber oil into the asphalt obtained in the step (1), and stirring for 0.5-1 h at the temperature of 170-180 ℃; and then slowly adding a stabilizer, stirring for 2-3 h, adding a regenerant at the temperature of 170-180 ℃, continuously stirring for 8-24 h, discharging and filling to obtain the product.
The invention also provides a preparation process of the high-efficiency regenerated asphalt mixture, which is characterized by comprising the following steps of:
the method comprises the following steps: the RAP materials are subjected to planning, milling and crushing and are divided into three grades of 20-10 mmRAP aggregates, 10-5 mmRAP aggregates and less than 5mmRAP aggregates, or two grades of 20-10 mmRAP aggregates and 10-0 mmRAP aggregates;
step two: heating the new aggregate and the mineral powder in a first drying cylinder of a gas heating method;
step three: heating RAP material in the third stage (or the second stage) in a second drying cylinder of the air heating method;
step four: after metering, respectively putting the new aggregate, the mineral powder and the three-grade (or two-grade) RAP material into a stirring pot, and uniformly stirring;
and step five, adding the special regenerated asphalt into the stirring pot, and uniformly stirring to obtain the high-efficiency regenerated asphalt mixture.
Further, the planing, milling and crushing mode in the first step is a planing mill and crushing and screening.
Furthermore, in the second step, the heating mode in the first drying cylinder is that new aggregate is heated in the drying cylinder of the original stirring equipment, dry hot air is introduced into the drying cylinder, and convection of the aggregate and the air is realized in the drying cylinder; and the other end of the drying cylinder is provided with an induced draft fan, heated gas is pumped back to the heat generator, and the heat energy is favorably recycled.
Further, the heating temperature in the first drying cylinder in the second step is 170-185 ℃.
Furthermore, the heating mode in the second drying cylinder in the third step is a concurrent heating mode, dry hot air is led into the old asphalt mixture drying cylinder, and the convection of the mixture and the air is realized in the drying cylinder; and the other end of the drying cylinder is provided with an induced draft fan, and heated gas is pumped back to the heat generator. The recycled gas may carry "blue fumes" and water vapor generated by heating. Thus, before entering the hot gas generator, the water vapour is separated to ensure the drying of the gas, while the "blue fumes" produced are burnt by reheating, both to prevent pollution and to generate heat.
Further, the heating temperature in the second drying cylinder in the third step is 120-140 ℃.
Further, the stirring equipment in the fourth step adopts intermittent forced stirring equipment.
Furthermore, the stirring equipment in the fourth step is heating type stirring equipment, so that the regenerated mixture can uniformly reach the discharging temperature.
Further, the temperature of the special regenerated asphalt in the fifth step is 165-180 ℃.
Further, the stirring temperature in the fifth step is 130-150 ℃.
The high-efficiency recycled asphalt mixture and the preparation process thereof provided by the invention have the following beneficial effects:
the asphalt used in the high-efficiency recycled asphalt mixture provided by the invention is a special cementing material for recycling which is independently developed, and the inside of the asphalt contains a multi-chain polyolefin modifier and a naphthenic oil regenerant, so that the high-low temperature performance and the recycling performance of the asphalt can be obviously improved. The multi-chain polyolefin modifier and the SBS copolymer can be combined into a novel graft copolymer, the polarity of the copolymer is very high, a uniform structure which is not separated in phase separation can be formed between the copolymer and the asphalt, and the stability, the high-temperature rheological property and the temperature sensitivity of the asphalt are effectively improved. The naphthenic oil regenerant used in the invention has good compatibility, good dispersibility on insoluble sulfides, and remarkable blending and regenerating performance on asphalt components. And the stability is good, no pollution and no toxicity are caused, the environmental pollution in the using process can be reduced, and the environmental protection is improved.
Secondly, aiming at the defects of volume design and mixture performance verification in the existing regenerated mixture design, the efficient regenerated asphalt mixture provided by the invention forms a regenerated asphalt mixture preparation method based on performance balance by integrating the American asphalt mixture design method (BMD) based on performance balance and the French high-modulus asphalt mixture design method (LPC). In the proportioning design, the gradation of the recycled asphalt mixture is freely adjusted, and even if the recycled asphalt mixture is a dense mixed material with extremely small void ratio, the high-temperature performance of the recycled asphalt mixture can be ensured due to the action of the recycled special asphalt. The invention integrates a French high-modulus asphalt mixture design method (LPC) and a American asphalt mixture design method (BMD) based on performance balance, strives for larger space for the synergistic promotion of the fatigue resistance performance and the low-temperature performance of the recycled asphalt mixture, and fully ensures the comprehensive promotion of the overall performance of the recycled mixture.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
Example 1
The high-efficiency regenerated asphalt mixture comprises the following components in parts by weight: 2 parts of special regenerated asphalt, 20 parts of new aggregate with the particle size of 10-20 mm, 45 parts of RAP material with the particle size of 10-20 mm, 30 parts of RAP material with the particle size of 5-10 mm and 5 parts of RAP material with the particle size of 0-5 mm.
The high-efficiency recycled asphalt mixture is an SMA-13 type asphalt mixture.
The new aggregate added in the high-efficiency recycled asphalt mixture is basalt with the grain size of 10-20 mm.
The RAP material added in the high-efficiency recycled asphalt mixture is a milled and recycled SMA-13 waste asphalt mixture.
The preparation method of the high-efficiency recycled asphalt mixture is characterized by comprising the following steps:
the method comprises the following steps: carrying out planning, milling and crushing on the SMA-13 waste asphalt mixture, and dividing the crushed mixture into three grades of 20-10 mmRAP aggregate, 10-5 mmRAP aggregate and less than 5mmRAP aggregate;
step two: heating 20 parts of new aggregate with the thickness of 10-20 mm in a first drying cylinder of a gas heating method, wherein the heating temperature is 170 ℃;
step three: heating 45 parts of RAP material with the particle size of 10-20 mm, 30 parts of RAP material with the particle size of 5-10 mm and 5 parts of RAP material with the particle size of 0-5 mm in a second drying cylinder of an air heating method at the temperature of 130 ℃;
step four: putting the new aggregate and the three-grade RAP material into a stirring pot, and uniformly stirring;
step five, adding the 175 ℃ special regenerated asphalt into a stirring pot, and uniformly stirring to obtain the high-efficiency regenerated asphalt mixture No. 1, wherein the stirring temperature is 140 ℃.
And (3) taking the high-efficiency recycled asphalt mixture No. 1 to measure the stability, the flow value, the dynamic stability and the low-temperature trabecula, wherein the detection results are shown in a table 1.
Table 11 # high-efficiency recycled asphalt mixture detection results
The detection results in Table 1 show that the 1# recycled asphalt mixture has excellent high-temperature performance, the stability is improved from 7.8kN to 12.54kN, and the dynamic stability is improved from 4238 times/mm to 9545 times/mm. The low-temperature crack resistance of the mixture is basically recovered in the aspect of low temperature, and the maximum bending strain at low temperature is increased from 1972 mu epsilon to 2299 mu epsilon. The improvement of high and low temperature performance shows that the regeneration effect of the No. 1 regenerated asphalt mixture is good.
Example 2
The high-efficiency regenerated asphalt mixture comprises the following components in parts by weight: 2.2 parts of special regeneration asphalt, 60 parts of RAP material with the particle size of 10-20 mm, 30 parts of RAP material with the particle size of 5-10 mm and 10 parts of RAP material with the particle size of 0-5 mm.
The high-efficiency recycled asphalt mixture is an AC-20 type fully recycled asphalt mixture.
The RAP material added in the high-efficiency recycled asphalt mixture is AC-20 type waste asphalt mixture recovered by milling.
The preparation method of the high-efficiency recycled asphalt mixture is characterized by comprising the following steps:
the method comprises the following steps: carrying out planning, milling and crushing on the AC-20 waste asphalt mixture, and dividing the mixture into three grades of 20-10 mmRAP aggregate, 10-5 mmRAP aggregate and less than 5mmRAP aggregate;
step two: heating 45 parts of RAP material with the particle size of 10-20 mm, 30 parts of RAP material with the particle size of 5-10 mm and 5 parts of RAP material with the particle size of 0-5 mm in a second drying cylinder of an air heating method at the heating temperature of 140 ℃;
step three: adding the three-gear RAP material into a stirring pot, and uniformly stirring;
step five, adding the 175 ℃ special regenerated asphalt into a stirring pot, and uniformly stirring to obtain the high-efficiency regenerated asphalt mixture No. 2, wherein the stirring temperature is 140 ℃.
And (3) taking the high-efficiency recycled asphalt mixture No. 2 to measure the stability, the flow value, the dynamic stability and the low-temperature trabecula, wherein the detection results are shown in a table 2.
TABLE 22 # detection results of high-efficiency recycled asphalt mixture
The detection results in table 2 show that the high-temperature performance of the 2# recycled asphalt mixture is improved, the stability is improved from 5.6kN to 8.72kN, and the dynamic stability is improved from 4500 times/mm to 6387 times/mm. Slightly increased in low temperature, and the maximum bending strain at low temperature is increased from 1412 mu epsilon to 1514 mu epsilon. The 2# recycled asphalt mixture is a fully recycled asphalt mixture, and the recycling effect is slightly improved.
Example 3
The high-efficiency regenerated asphalt mixture comprises the following components in parts by weight: 2 parts of special regenerated asphalt, 20 parts of new aggregate with the particle size of 10-20 mm, 45 parts of RAP material with the particle size of 10-20 mm, 30 parts of RAP material with the particle size of 5-10 mm and 5 parts of RAP material with the particle size of 0-5 mm.
The high-efficiency recycled asphalt mixture is an AC-20 type asphalt mixture.
The new aggregate added into the high-efficiency regeneration asphalt mixture is limestone with the grain diameter of 10-20 mm.
The RAP material added in the high-efficiency recycled asphalt mixture is AC-20 waste asphalt mixture recovered by milling.
The preparation method of the high-efficiency recycled asphalt mixture is characterized by comprising the following steps:
the method comprises the following steps: carrying out planning, milling and crushing on the AC-20 waste asphalt mixture, and dividing the mixture into three grades of 20-10 mmRAP aggregate, 10-5 mmRAP aggregate and less than 5mmRAP aggregate;
step two: heating 20 parts of new aggregate with the thickness of 10-20 mm in a first drying cylinder of a gas heating method, wherein the heating temperature is 170 ℃;
step three: heating 45 parts of RAP material with the particle size of 10-20 mm, 30 parts of RAP material with the particle size of 5-10 mm and 5 parts of RAP material with the particle size of 0-5 mm in a second drying cylinder of an air heating method at the heating temperature of 140 ℃;
step four: putting the new aggregate and the three-grade RAP material into a stirring pot, and uniformly stirring;
step five, adding the 175 ℃ special regenerated asphalt into a stirring pot, and uniformly stirring to obtain the high-efficiency regenerated asphalt mixture No. 3, wherein the stirring temperature is 140 ℃.
And (3) taking the high-efficiency recycled asphalt mixture No. 3 to measure the stability, the flow value, the dynamic stability and the low-temperature trabecula, wherein the detection results are shown in a table 3.
TABLE 33 # high-efficiency recycled asphalt mixture test results
| Detecting items | Unit of | 3# detection result of high-efficiency regeneration mixture | Original AC road surface detection result |
| Degree of stability | kN | 8.43 | 5.60 |
| Flow value | 0.1mm | 45.2 | 44.5 |
| Maximum bending strain at low temperature | με | 1887 | 1412 |
| Degree of dynamic stability | Sub/mm | 8750 | 4500 |
The detection results in Table 3 show that the 3# recycled asphalt mixture has excellent high-temperature performance, the stability is improved from 5.6kN to 8.43kN, and the dynamic stability is improved from 4500 times/mm to 8750 times/mm. The low-temperature crack resistance of the mixture is basically recovered at low temperature, and the maximum low-temperature bending strain is increased from 1412 mu epsilon to 1887 mu epsilon. The improvement of high and low temperature performance shows that the regeneration effect of the 3# regenerated asphalt mixture is good.
Example 4
The high-efficiency regenerated asphalt mixture comprises the following components in parts by weight: 2 parts of special regenerated asphalt, 20 parts of new aggregate with the particle size of 10-20 mm, 44 parts of RAP material with the particle size of 10-20 mm, 30 parts of RAP material with the particle size of 5-10 mm, 5 parts of RAP material with the particle size of 0-5 mm and 1 part of mineral powder.
The high-efficiency recycled asphalt mixture is an AC-20 type asphalt mixture.
The new aggregate added into the high-efficiency regeneration asphalt mixture is limestone with the grain diameter of 10-20 mm.
The RAP material added in the high-efficiency recycled asphalt mixture is AC-20 waste asphalt mixture recovered by milling.
The preparation method of the high-efficiency recycled asphalt mixture is characterized by comprising the following steps:
the method comprises the following steps: carrying out planning, milling and crushing on the AC-20 waste asphalt mixture, and dividing the mixture into three grades of 20-10 mmRAP aggregate, 10-5 mmRAP aggregate and less than 5mmRAP aggregate;
step two: heating 20 parts of new aggregate with the thickness of 10-20 mm and 1 part of mineral powder in a first drying cylinder of an air heating method, wherein the heating temperature is 170 ℃;
step three: heating 44 parts of RAP material with the particle size of 10-20 mm, 30 parts of RAP material with the particle size of 5-10 mm and 5 parts of RAP material with the particle size of 0-5 mm in a second drying cylinder of an air heating method at the heating temperature of 140 ℃;
step four: putting the new aggregate, the mineral powder and the three-grade RAP material into a stirring pot, and uniformly stirring;
step five, adding the 175 ℃ special regenerated asphalt into a stirring pot, and uniformly stirring to obtain the high-efficiency regenerated asphalt mixture No. 4, wherein the stirring temperature is 140 ℃.
And measuring the stability, the flow value, the dynamic stability and the low-temperature trabecula of the high-efficiency recycled asphalt mixture No. 4, wherein the detection results are shown in a table 4.
TABLE 44 # detection results of high-efficiency recycled asphalt mixture
| Detecting items | Unit of | High-efficiency regenerated mixture 4# detection result | Original AC road surface detection result |
| Degree of stability | kN | 8.55 | 5.60 |
| Flow value | 0.1mm | 23.4 | 44.5 |
| Maximum bending strain at low temperature | με | 1821 | 1412 |
| Degree of dynamic stability | Sub/mm | 9844 | 4500 |
The detection results in Table 4 show that the 4# recycled asphalt mixture has excellent high-temperature performance, the stability is improved from 5.6kN to 8.55kN, and the dynamic stability is improved from 4500 times/mm to 9844 times/mm. The low-temperature crack resistance of the mixture is basically recovered at low temperature, and the maximum low-temperature bending strain is increased from 1412 mu epsilon to 1821 mu epsilon. The improvement of high and low temperature performance shows that the regeneration effect of the No. 4 regenerated asphalt mixture is good.
Example 5
The high-efficiency regenerated asphalt mixture comprises the following components in parts by weight: 2 parts of special regenerated asphalt, 25 parts of new aggregate with the particle size of 10-15 mm, 22 parts of RAP material with the particle size of 10-20 mm and 53 parts of RAP material with the particle size of 0-10 mm.
The high-efficiency recycled asphalt mixture is an AC-13 type asphalt mixture.
The new aggregate added into the high-efficiency regeneration asphalt mixture is limestone with the grain diameter of 10-15 mm.
The RAP material added in the high-efficiency recycled asphalt mixture is AC-13 waste asphalt mixture recovered by milling.
The preparation method of the high-efficiency recycled asphalt mixture is characterized by comprising the following steps:
the method comprises the following steps: carrying out planning, milling and crushing on the AC-13 waste asphalt mixture, and dividing the mixture into 20-10 mmRAP aggregates and 10-0 mmRAP aggregates;
step two: heating 25 parts of new aggregate with the thickness of 10-15 mm in a first drying cylinder of a gas heating method, wherein the heating temperature is 180 ℃;
step three: heating 22 parts of RAP material with the particle size of 10-20 mm and 53 parts of RAP material with the particle size of 0-10 mm in a second drying cylinder of an air heating method at the temperature of 135 ℃;
step four: putting the new aggregate and the two RAP materials into a stirring pot, and uniformly stirring;
step five, adding the 175 ℃ special regenerated asphalt into a stirring pot, and uniformly stirring to obtain the high-efficiency regenerated asphalt mixture No. 5, wherein the stirring temperature is 140 ℃.
And measuring the stability, the flow value, the dynamic stability and the low-temperature trabecula of the high-efficiency recycled asphalt mixture No. 5, wherein the detection results are shown in a table 5.
TABLE 55 # detection results of high-efficiency recycled asphalt mixture
| Detecting items | Unit of | Detection result of high-efficiency regeneration mixture 5# | Original AC road surface detection result |
| Degree of stability | kN | 10.51 | 5.60 |
| Flow value | 0.1mm | 37.6 | 44.5 |
| Maximum bending strain at low temperature | με | 2405 | 1412 |
| Degree of dynamic stability | Sub/mm | 6058 | 4500 |
The detection results in Table 5 show that the 5# recycled asphalt mixture has excellent high-temperature performance, the stability is improved from 5.6kN to 10.51kN, and the dynamic stability is improved from 4500 times/mm to 6058 times/mm. The low-temperature crack resistance of the mixture is basically recovered at low temperature, and the maximum low-temperature bending strain is increased from 1412 mu epsilon to 2405 mu epsilon. The improvement of high and low temperature performance shows that the regeneration effect of the No. 5 regenerated asphalt mixture is good.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the equivalent substitutions and changes according to the technical concept of the present invention should be covered within the protection scope of the present invention.
Claims (8)
1. The efficient regeneration asphalt mixture is characterized by comprising 1.0-3.0 parts by mass of special regeneration asphalt and 100 parts by mass of aggregate; the 100 parts of aggregate is composed of the following raw materials in parts by mass: 0-30 parts of new aggregate with the particle size of 10-25 mm, 0-70 parts of RAP material with the particle size of 10-20 mm, 0-80 parts of RAP material with the particle size of 5-10 mm, 0-20 parts of RAP material with the particle size of 0-5 mm and 0-3 parts of mineral powder;
the special asphalt for regeneration consists of base asphalt, styrene-containing modifier, multi-chain polyolefin modifier, rubber oil, naphthenic oil regenerant and stabilizer:
the base asphalt, the styrene-containing modifier, the multi-chain polyolefin modifier, the rubber oil, the naphthenic oil regenerant and the stabilizer comprise the following components in percentage by mass:
the multi-chain polyolefin modifier is oxidized polyethylene wax, the melt drop point of the modifier is 100-150 ℃, the viscosity at 140 ℃ is 200-5000 cps, and the acid value is 14-55 mgKOH/g;
the stabilizer is one of elemental sulfur, diaryl disulfide and nitro-substituted diaryl disulfide.
2. The high-efficiency recycled asphalt mixture according to claim 1, wherein: the new aggregate is limestone or basalt with the particle size of 10-25 mm.
3. The process for preparing a high-efficiency recycled asphalt mixture according to claim 1, wherein the process comprises the following steps: the method comprises the following steps: the RAP materials are subjected to planning, milling and crushing and are divided into three grades of 20-10 mmRAP aggregates, 10-5 mmRAP aggregates and less than 5mmRAP aggregates, or two grades of 20-10 mmRAP aggregates and 10-0 mmRAP aggregates;
step two: heating the new aggregate and the mineral powder in a first drying cylinder of a gas heating method;
step three: heating the RAP material with the third grade or the second grade in a second drying cylinder of an air heating method;
step four: after metering, respectively putting the new aggregate, the mineral powder and the RAP material with three grades or two grades into a stirring pot, and uniformly stirring;
step five, adding the special recycled asphalt of claim 1 into a stirring pot, and uniformly stirring to obtain a high-efficiency recycled asphalt mixture;
in the second step, the heating temperature in the first drying cylinder is 170-185 ℃;
the heating temperature in the second drying cylinder in the third step is 120-140 ℃;
the temperature of the special regenerated asphalt in the fifth step is 165-180 ℃;
and the stirring temperature in the fifth step is 130-150 ℃.
4. The preparation process of the high-efficiency recycled asphalt mixture according to claim 3, which is characterized by comprising the following steps of: the planing, milling and crushing mode in the first step is one of harrowing, crushing and screening, and a milling machine and crushing and screening.
5. The preparation process of the high-efficiency recycled asphalt mixture according to claim 3, which is characterized by comprising the following steps of: in the second step, the heating mode in the first drying cylinder is that the new aggregate is heated in the drying cylinder of the original stirring equipment, and dry hot air is introduced into the drying cylinder to realize the convection of the aggregate and the air in the drying cylinder; and the other end of the drying cylinder is provided with an induced draft fan, heated gas is pumped back to the heat generator, and the heat energy is favorably recycled.
6. The preparation process of the high-efficiency recycled asphalt mixture according to claim 3, which is characterized by comprising the following steps of: the heating mode in the second drying cylinder in the third step is a concurrent heating mode, dry hot gas is led into the old asphalt mixture drying cylinder, and convection of the mixture and the gas is realized in the drying cylinder; the other end of the drying cylinder is provided with an induced draft fan, and heated gas is pumped back to the heat generator; the recycled gas may carry "blue fumes" and water vapour generated by heating; thus, before entering the hot gas generator, the water vapour is separated to ensure the drying of the gas, while the "blue fumes" produced are burnt by reheating, both to prevent pollution and to generate heat.
7. The preparation process of the high-efficiency recycled asphalt mixture according to claim 3, which is characterized by comprising the following steps of: and the stirring equipment in the fourth step adopts intermittent forced stirring equipment.
8. The preparation process of the high-efficiency recycled asphalt mixture according to claim 3, which is characterized by comprising the following steps of: and the stirring equipment in the fourth step is heating type stirring equipment, so that the regenerated mixture can uniformly reach the discharging temperature.
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| CN202010784971.5A CN112125575B (en) | 2020-08-06 | 2020-08-06 | High-efficiency regenerated asphalt mixture and preparation process thereof |
| PCT/CN2020/114529 WO2022027778A1 (en) | 2020-08-06 | 2020-09-10 | High-efficiency reclaimed asphalt mixture and preparation process thereof |
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| CN114960329A (en) * | 2022-06-28 | 2022-08-30 | 西安市政道桥建设集团有限公司 | Pavement repairing method for foam asphalt grid alternate flow construction under low temperature condition |
| CN115124282B (en) * | 2022-07-11 | 2024-03-19 | 东南大学 | Asphalt pavement old material recycling mixture based on SBS and epoxy resin system and preparation method thereof |
| CN115594440A (en) * | 2022-09-14 | 2023-01-13 | 华北水利水电大学（Cn） | Polyurethane modified cold-recycling mixture and preparation method thereof |
| CN115849766A (en) * | 2022-09-23 | 2023-03-28 | 保利长大工程有限公司 | Processing technology of mixing ratio of regenerant in hot mix plant recycled asphalt |
| CN116283066B (en) * | 2023-01-06 | 2023-12-26 | 黑龙江大学 | High-performance asphalt mixture prepared from chicken graphite tailings in AC-16 grading manner and preparation method of asphalt mixture |
| CN116621507B (en) * | 2023-05-26 | 2024-04-02 | 无锡翔云道桥科技有限公司 | Recycled asphalt concrete and preparation method thereof |
| CN116693242B (en) * | 2023-07-25 | 2023-11-07 | 湖南云中再生科技股份有限公司 | Preparation method of cold-recycled asphalt mixture, cold-recycled asphalt mixture and application |
| CN117049820B (en) * | 2023-10-12 | 2023-12-22 | 北京建筑大学 | Asphalt sand mixture of residue of direct coal liquefaction and preparation method thereof |
| CN117647220B (en) * | 2024-01-25 | 2024-04-26 | 安徽省交通规划设计研究总院股份有限公司 | Asphalt pavement subsidence treatment method based on laser point cloud data |
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| CN112125575A (en) | 2020-12-25 |
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