Anti-stripping warm mix asphalt regenerant with high and low temperature performance and preparation method of regenerated asphalt mixture thereof

Abstract

The invention discloses an anti-stripping warm mix asphalt regenerant with high and low temperature performances. The regenerant comprises the following components: a common asphalt regenerant; a viscosity reducer; a crosslinking curing agent; a slow crosslinking agent; the mass ratio of the common asphalt regenerant to the viscosity reducer to the cross-linking curing agent to the slow cross-linking agent is 100: 10: (30-90): 5. The regenerant can enhance workability and reduce carbon emission in the regeneration process of the aged asphalt mixture, the regenerated asphalt mixture has excellent high-temperature deformation resistance, low-temperature crack resistance and stripping resistance, the engineering problems of low-carbon regeneration and durable service of the aged asphalt mixture can be greatly solved, the preparation process is simple, the cost is low, and the method is suitable for industrial production. The process is low-carbon and efficient, equipment does not need to be transformed and upgraded, the resource utilization rate is high, and economic, environmental and social benefits are remarkable.

Description

Technical Field

[0001] The present invention relates to the technical field of road materials, and more specifically to an anti-stripping warm-mix asphalt regenerator with both high and low temperature performance and a method for preparing a regenerated asphalt mixture thereof. Background Art

[0002] As the service time increases, asphalt pavement is easily affected by climate, load and environment, resulting in pavement defects such as cracking, potholes and peeling, which seriously affect driving safety and comfort. The main reason for these defects is that asphalt ages under the combined effects of light, heat and oxygen, causing changes in physical and chemical properties, resulting in reduced adhesion and increased brittleness. When the asphalt pavement is severely damaged and needs to be repaired and rebuilt, a large amount of waste asphalt mixture will be generated.

[0003] Research has found that traditional hot mix recycling technology has a significant effect on improving the low-temperature performance of aged asphalt mixtures. At the same time, there are also engineering problems such as insufficient high-temperature performance and anti-stripping of aged asphalt mixtures after recycling, and large carbon emissions during production and construction. As further research has shown, the use of warm mix recycling technology can better solve the carbon emission problem, but the high-temperature performance and anti-stripping of recycled mixtures are still shortcomings. Therefore, low-carbon recycling technology for waste asphalt mixtures still needs to be urgently studied and applied.

[0004] In general, at this stage, there is an urgent need to break through the existing barriers to recycling technology and carry out research and application of an anti-stripping warm-mix asphalt regeneration agent with both high and low temperature performance and a method for preparing a recycled asphalt mixture, which is crucial to achieving high-quality, high-efficiency and low-carbon recycling of waste asphalt mixtures.

[0005] Therefore, we proposed an anti-stripping warm-mix asphalt regeneration agent with both high and low temperature performance and a method for preparing a regenerated asphalt mixture to solve the above problems. Summary of the invention

[0006] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides an anti-stripping warm-mix asphalt regeneration agent with both high and low temperature performance and a method for preparing a regenerated asphalt mixture thereof, so as to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solution: an anti-stripping warm-mix asphalt regeneration agent with both high and low temperature performance, characterized in that it comprises the following components: a common asphalt regeneration agent;

[0008] Viscosity reducers;

[0009] Cross-linking curing agent;

[0010] Retarder crosslinking agent;

[0011] The mass ratio of common asphalt regeneration agent, viscosity reducer, cross-linking curing agent and slow cross-linking agent is:

[0012] 100:10:(30-90):5.

[0013] In a preferred embodiment, the common asphalt regeneration agent is one or more of catalytic cracking slurry oil, aromatic oil and waste food oil.

[0014] In a preferred embodiment, the viscosity reducing agent is solvent oil.

[0015] In a preferred embodiment, the cross-linking curing agent is at least one of polymethylene polyphenyl isocyanate, sulfur and dibenzoyl peroxide.

[0016] In a preferred embodiment, the cross-linking retarder is at least one of carbon black and limestone powder.

[0017] In a preferred embodiment, a method for preparing an anti-stripping warm mix asphalt regeneration agent having both high and low temperature performances comprises the following production steps:

[0018] Step S1: weigh the raw materials of the temperature-mixed asphalt regeneration agent such as the common asphalt regeneration agent, the viscosity reducer, the cross-linking curing agent, and the slow cross-linking agent according to the mass ratio and set aside;

[0019] Step S2: Mix and stir the raw materials weighed in step S1 for a certain period of time under appropriate temperature conditions to obtain an anti-stripping warm-mix asphalt regeneration agent with both high and low temperature performance, and store it at room temperature after sealing.

[0020] In a preferred embodiment, in step S2, the raw materials weighed in step S1 are mixed at a stirring speed of 500-800 rpm at 25°C-50°C for 5min-15min.

[0021] In a preferred embodiment, a method for preparing a recycled asphalt mixture comprises the following production steps:

[0022] S1: Prepare aged asphalt mixture by heating new asphalt mixture (AC-13 aggregate gradation, asphalt-to-stone ratio of 4.8%) in a 135°C oven with forced ventilation for 4 h and in an 85°C oven with forced ventilation for 5 d, or directly use the recycled material from road milling;

[0023] S2: Add the aged asphalt mixture or recycled material heated to 140℃-155℃ into a mixing pot at 140℃-155℃ and mix evenly, add 3%-9% warm mix asphalt regeneration agent, and add No. 70 asphalt at the same time, continue mixing for 100s to obtain an anti-stripping warm mix recycled asphalt mixture with both high and low temperature performance.

[0024] In a preferred embodiment, in step S2, the condition for adding the differential No. 70 asphalt is to ensure that the oil-to-rock ratio of the warm-mix recycled asphalt mixture is consistent with the crude oil-to-rock ratio of 4.8%.

[0025] Technical effects and advantages of the present invention:

[0026] The common asphalt regeneration agent designed in the present invention plays a role in dissolving and regulating the components of aged asphalt, and the viscosity reducer plays a role in further regulating the aged asphalt and improving the working characteristics, so as to ensure that the prepared regeneration agent can meet the conditions of warm-mix recycled asphalt mixture. Furthermore, a cross-linking curing agent is added to the above components, and it is considered that it reacts with some functional groups in the aged asphalt to improve the high-temperature performance, and it is considered that it reacts chemically with the surface groups of the aggregate to improve the anti-stripping property. Finally, a retarding cross-linking agent is introduced into the above-mentioned composite warm-mix regeneration agent to ensure that the curing and cross-linking reaction is delayed, and the workability of the recycled material during mixing is not affected by the viscosity. At the same time, after paving, the high-temperature performance of the recycled material is gradually improved to a stable state as the curing reaction proceeds.

[0027] The anti-stripping warm-mix asphalt regeneration agent with both high and low temperature performance prepared by the present invention can regenerate recycled materials produced by common asphalts such as ordinary base asphalt, SBS modified asphalt, rubber asphalt or polymer composite modified asphalt, has good universality and good application prospects.

[0028] The anti-stripping warm-mix asphalt regeneration agent with both high and low temperature performance prepared by the present invention can achieve high-quality, low-carbon warm-mix regeneration of recycled mixtures, and the preparation process of the recycled asphalt mixture saves energy and reduces emissions, improves engineering performance, and extends service life, with significant economic, environmental and social benefits.

[0029] The production and construction process of the high and low temperature performance-combined anti-stripping warm-mix recycled asphalt mixture involved in the present invention does not change, the implementation equipment does not need to be modified or upgraded, the resource utilization rate is high, and the engineering value is significant. DETAILED DESCRIPTION

[0030] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0032] The experimental methods of the following examples, unless otherwise specified, are all conventional methods in the art. The following experimental materials, unless otherwise specified, are all commercially available.

[0033] Raw materials of anti-stripping warm mix asphalt regeneration agent with both high and low temperature performance:

[0034] Catalytic cracking oil slurry and aromatic oil, the relative content of aromatic components of which is not less than 70% and the viscosity at 100℃ is not higher than 30mPa·s;

[0035] Waste vegetable oil, with a viscosity of not more than 60 mPa·s at 20°C;

[0036] Solvent oil, with the brand name D80, with a saturated hydrocarbon content of not less than 99% and a density of not less than 815kg / m3 at 20°C;

[0037] Polymethylene polyphenyl isocyanate, with an isocyanate-NCO content of not less than 30% and a viscosity of not more than 200 mPa·s at 25°C;

[0038] Sulfur, light yellow powder, melting point 119°C, active chemical properties, cross-linking and curing some organic matter;

[0039] Dibenzoyl peroxide, melting point 105°C, boiling point 349.7°C, plays a role in cross-linking and curing;

[0040] Carbon black and limestone powder are both conventional products available on the market, without any particle agglomeration, and play a role in slowing down the cross-linking speed to a certain extent.

[0041] Raw materials for high and low temperature performance-compatible anti-stripping warm mix recycled asphalt mixture:

[0042] No. 70 base asphalt, with a softening point of 47.6°C, a needle penetration of 68 dmm at 25°C, an elongation of not less than 100 cm at 15°C, and a viscosity of 476 mPa·s at 135°C;

[0043] Natural coarse aggregate (greater than 2.36 mm) is continuously graded limestone crushed stone with an apparent density of 2.74 g cm -3 , the crushing value is 18.6% and the water absorption is 0.28%;

[0044] Natural fine aggregate (less than 2.36 mm) is a continuously graded limestone fine aggregate with an apparent density of 2.70 g cm -3 , solidity is 2.1% and sand equivalent is 78.2%;

[0045] The mineral powder is ground from natural limestone, with a particle size of 0mm-0.075mm and an apparent density of 2.73g·cm -3 , the hydrophilicity coefficient is 0.69, and there is no agglomeration.

[0046] Example 1

[0047] This embodiment includes a preparation process of a high-low temperature performance-combined anti-stripping warm-mix asphalt regeneration agent and a regenerated asphalt mixture thereof, which is specifically as follows:

[0048] S1: According to the raw material mass ratio of 100:10:30:5, 200 g, 20 g, 60 g and 10 g of catalytic cracking oil slurry, solvent oil, polymethylene polyphenyl isocyanate and carbon black are weighed in sequence and premixed;

[0049] S2: The raw materials premixed in step S1 are mixed at a stirring speed of 500 rpm at 25°C for 5 minutes to obtain an anti-stripping warm-mix asphalt regeneration agent with both high and low temperature performance, which is sealed and stored at room temperature.

[0050] S3: Prepare aged asphalt mixture by heating new asphalt mixture (AC-13 aggregate gradation, oil-to-stone ratio of 4.8%) in a 135°C oven with forced ventilation for 4 h and in an 85°C oven with forced ventilation for 5 d, or directly use the recycled material from road milling;

[0051] S4: Add the aged asphalt mixture or recycled material heated to 150°C into a mixing pot at 150°C and mix evenly, add 3% of the warm-mix asphalt regeneration agent involved in step S2 (relative to the residual asphalt mass in the aged asphalt mixture or recycled material, determined by combustion method), and at the same time add No. 70 asphalt (to ensure that the oil-stone ratio of the warm-mix recycled asphalt mixture remains consistent with the original 4.8%), continue mixing for 100s, and obtain an anti-stripping warm-mix recycled asphalt mixture with both high and low temperature performance.

[0052] Example 2

[0053] This embodiment includes a preparation process of a high-low temperature performance-combined anti-stripping warm-mix asphalt regeneration agent and a regenerated asphalt mixture thereof, which is specifically as follows:

[0054] S1: According to the raw material mass ratio of 100:10:30:5, 200 g, 20 g, 60 g and 10 g of catalytic cracking oil slurry, solvent oil, polymethylene polyphenyl isocyanate and carbon black are weighed in sequence and premixed;

[0055] S2: The raw materials premixed in step S1 are mixed at a stirring speed of 500 rpm at 25°C for 5 minutes to obtain an anti-stripping warm-mix asphalt regeneration agent with both high and low temperature performance, which is sealed and stored at room temperature.

[0056] S3: Prepare aged asphalt mixture by heating new asphalt mixture (AC-13 aggregate gradation, oil-to-stone ratio of 4.8%) in a 135°C oven with forced ventilation for 4 h and in an 85°C oven with forced ventilation for 5 d, or directly use the recycled material from road milling;

[0057] S4: Add the aged asphalt mixture or recycled material heated to 150°C into a mixing pot at 150°C and mix evenly, add 6% of the warm-mix asphalt regeneration agent involved in step S2 (relative to the residual asphalt mass in the aged asphalt mixture or recycled material, determined by combustion method), and at the same time add No. 70 asphalt (to ensure that the oil-stone ratio of the warm-mix recycled asphalt mixture remains consistent with the original 4.8%), continue mixing for 100s, and obtain an anti-stripping warm-mix recycled asphalt mixture with both high and low temperature performance.

[0058] In this embodiment, the dosage of the anti-stripping warm mix asphalt regeneration agent with both high and low temperature performance is changed to 6%, and the other steps are consistent with those in Example 1.

[0059] Example 3

[0060] This embodiment includes a preparation process of a high-low temperature performance-combined anti-stripping warm-mix asphalt regeneration agent and a regenerated asphalt mixture thereof, which is specifically as follows:

[0061] S1: According to the raw material mass ratio of 100:10:30:5, 200 g, 20 g, 60 g and 10 g of catalytic cracking oil slurry, solvent oil, polymethylene polyphenyl isocyanate and carbon black are weighed in sequence and premixed;

[0062] S2: The raw materials premixed in step S1 are mixed at a stirring speed of 500 rpm at 25°C for 5 minutes to obtain an anti-stripping warm-mix asphalt regeneration agent with both high and low temperature performance, which is sealed and stored at room temperature.

[0063] S3: Prepare aged asphalt mixture by heating new asphalt mixture (AC-13 aggregate gradation, oil-to-stone ratio of 4.8%) in a 135°C oven with forced ventilation for 4 h and in an 85°C oven with forced ventilation for 5 d, or directly use the recycled material from road milling;

[0064] S4: Add the aged asphalt mixture or recycled material heated to 150°C into a mixing pot at 150°C and mix evenly, add 9% of the warm-mix asphalt regeneration agent involved in step S2 (relative to the residual asphalt mass in the aged asphalt mixture or recycled material, determined by combustion method), and at the same time add No. 70 asphalt (to ensure that the oil-stone ratio of the warm-mix recycled asphalt mixture remains consistent with the original 4.8%), continue mixing for 100s, and obtain an anti-stripping warm-mix recycled asphalt mixture with both high and low temperature performance.

[0065] In this embodiment, the dosage of the anti-stripping warm mix asphalt regeneration agent with both high and low temperature performance is changed to 9%, and the other steps are consistent with those in Example 1.

[0066] Example 4

[0067] This embodiment includes a preparation process of a high-low temperature performance-combined anti-stripping warm-mix asphalt regeneration agent and a regenerated asphalt mixture thereof, which is specifically as follows:

[0068] S1: The raw material ratio of catalytic cracking oil slurry, solvent oil, polymethylene polyphenyl isocyanate and carbon black is changed to 100:10:60:5, i.e. 200 g, 20 g, 120 g and 10 g, and premixed;

[0069] S2: The raw materials premixed in step S1 are mixed at a stirring speed of 500 rpm at 25°C for 5 minutes to obtain an anti-stripping warm-mix asphalt regeneration agent with both high and low temperature performance, which is sealed and stored at room temperature.

[0070] S3: Prepare aged asphalt mixture by heating new asphalt mixture (AC-13 aggregate gradation, oil-to-stone ratio of 4.8%) in a 135°C oven with forced ventilation for 4 h and in an 85°C oven with forced ventilation for 5 d, or directly use the recycled material from road milling;

[0071] S4: Add the aged asphalt mixture or recycled material heated to 150°C into a mixing pot at 150°C and mix evenly, add 6% of the warm-mix asphalt regeneration agent involved in step S2 (relative to the residual asphalt mass in the aged asphalt mixture or recycled material, determined by combustion method), and add No. 70 asphalt by difference (to ensure that the oil-stone ratio of the warm-mix recycled asphalt mixture remains consistent with the original 4.8%), continue mixing for 100s, and obtain a warm-mix recycled asphalt mixture with high and low temperature performance and anti-stripping.

[0072] In this example, the dosage of polymethylene polyphenyl isocyanate in the prepared regeneration agent is changed so that the raw material ratio of catalytic cracking slurry, solvent oil, polymethylene polyphenyl isocyanate and carbon black becomes 100:10:60:5, i.e. 200g, 20g, 120g and 10g, and the other steps are consistent with Example 2.

[0073] Example 5

[0074] This embodiment includes a preparation process of a high-low temperature performance-combined anti-stripping warm-mix asphalt regeneration agent and a regenerated asphalt mixture thereof, which is specifically as follows:

[0075] S1: The raw material ratio of catalytic cracking oil slurry, solvent oil, polymethylene polyphenyl isocyanate and carbon black is changed to 100:10:60:5, i.e. 200 g, 20 g, 120 g and 10 g, and premixed;

[0076] S2: The raw materials premixed in step S1 are mixed at a stirring speed of 500 rpm at 25°C for 5 minutes to obtain an anti-stripping warm-mix asphalt regeneration agent with both high and low temperature performance, which is sealed and stored at room temperature.

[0077] S3: Prepare aged asphalt mixture by heating new asphalt mixture (AC-13 aggregate gradation, oil-to-stone ratio of 4.8%) in a 135°C oven with forced ventilation for 4 h and in an 85°C oven with forced ventilation for 5 d, or directly use the recycled material from road milling;

[0078] S4: Add the aged asphalt mixture or recycled material heated to 150°C into a mixing pot at 150°C and mix evenly, add 6% of the warm-mix asphalt regeneration agent involved in step S2 (relative to the residual asphalt mass in the aged asphalt mixture or recycled material, determined by combustion method), and add No. 70 asphalt by difference (to ensure that the oil-stone ratio of the warm-mix recycled asphalt mixture remains consistent with the original 4.8%), continue mixing for 100s, and obtain a warm-mix recycled asphalt mixture with high and low temperature performance and anti-stripping.

[0079] In this example, the amount of polymethylene polyphenyl isocyanate in the prepared regeneration agent is changed so that the raw material ratio of catalytic cracking oil slurry, solvent oil, polymethylene polyphenyl isocyanate and carbon black becomes 100:10:60:5, i.e. 200g, 20g, 120g and 10g. The other steps are consistent with Example 2.

[0080] In this example, the dosage of polymethylene polyphenyl isocyanate in the prepared regeneration agent is changed so that the raw material ratio of catalytic cracking slurry, solvent oil, polymethylene polyphenyl isocyanate and carbon black becomes 100:10:90:5, i.e. 200g, 20g, 180g and 10g, and the other steps are consistent with Example 2.

[0081] Example 6

[0082] This embodiment includes a preparation process of a high-low temperature performance-combined anti-stripping warm-mix asphalt regeneration agent and a regenerated asphalt mixture thereof, which is specifically as follows:

[0083] S1: According to the raw material mass ratio of 100:10:30:5, 200g, 20g, 60g and 10g of aromatic oil, solvent oil, polymethylene polyphenyl isocyanate and carbon black are weighed in sequence and premixed;

[0084] S2: The raw materials premixed in step S1 are mixed at a stirring speed of 500 rpm at 25°C for 5 minutes to obtain an anti-stripping warm-mix asphalt regeneration agent with both high and low temperature performance, which is sealed and stored at room temperature.

[0085] S3: Prepare aged asphalt mixture by heating new asphalt mixture (AC-13 aggregate gradation, oil-to-stone ratio of 4.8%) in a 135°C oven with forced ventilation for 4 h and in an 85°C oven with forced ventilation for 5 d, or directly use the recycled material from road milling;

[0086] S4: Add the aged asphalt mixture or recycled material heated to 150°C into a mixing pot at 150°C and mix evenly, add 6% of the warm-mix asphalt regeneration agent involved in step S2 (relative to the residual asphalt mass in the aged asphalt mixture or recycled material, determined by combustion method), and at the same time add No. 70 asphalt (to ensure that the oil-stone ratio of the warm-mix recycled asphalt mixture remains consistent with the original 4.8%), continue mixing for 100s, and obtain an anti-stripping warm-mix recycled asphalt mixture with both high and low temperature performance.

[0087] In this example, the catalytic cracking oil slurry in Example 2 is replaced by aromatic oil, and the raw material ratio and other steps are consistent with those in Example 2.

[0088] Example 7

[0089] This embodiment includes a preparation process of a high-low temperature performance-combined anti-stripping warm-mix asphalt regeneration agent and a regenerated asphalt mixture thereof, which is specifically as follows:

[0090] S1: According to the raw material mass ratio of 100:10:30:5, 200g, 20g, 60g and 10g of waste food oil, solvent oil, polymethylene polyphenyl isocyanate and carbon black were weighed in sequence and premixed;

[0091] S2: The raw materials premixed in step S1 are mixed at a stirring speed of 500 rpm at 25°C for 5 minutes to obtain an anti-stripping warm-mix asphalt regeneration agent with both high and low temperature performance, which is sealed and stored at room temperature.

[0092] S3: Prepare aged asphalt mixture by heating new asphalt mixture (AC-13 aggregate gradation, oil-to-stone ratio of 4.8%) in a 135°C oven with forced ventilation for 4 h and in an 85°C oven with forced ventilation for 5 d, or directly use the recycled material from road milling;

[0093] S4: Add the aged asphalt mixture or recycled material heated to 150°C into a mixing pot at 150°C and mix evenly, add 6% of the warm-mix asphalt regeneration agent involved in step S2 (relative to the residual asphalt mass in the aged asphalt mixture or recycled material, determined by combustion method), and at the same time add No. 70 asphalt (to ensure that the oil-stone ratio of the warm-mix recycled asphalt mixture remains consistent with the original 4.8%), continue mixing for 100s, and obtain an anti-stripping warm-mix recycled asphalt mixture with both high and low temperature performance.

[0094] In this embodiment, the catalytic cracking slurry in Example 2 is replaced by waste food oil, and the raw material ratio and other steps are consistent with those in Example 2.

[0095] Example 8

[0096] This embodiment includes a preparation process of a high-low temperature performance-combined anti-stripping warm-mix asphalt regeneration agent and a regenerated asphalt mixture thereof, which is specifically as follows:

[0097] S1: According to the raw material mass ratio of 100:10:30:5, 200g, 20g, 60g and 10g of waste food oil, solvent oil, sulfur and carbon black were weighed in sequence and premixed;

[0098] S2: The raw materials premixed in step S1 are mixed at a stirring speed of 500 rpm at 25°C for 5 minutes to obtain an anti-stripping warm-mix asphalt regeneration agent with both high and low temperature performance, which is sealed and stored at room temperature.

[0099] S3: Prepare aged asphalt mixture by heating new asphalt mixture (AC-13 aggregate gradation, oil-to-stone ratio of 4.8%) in a 135°C oven with forced ventilation for 4 h and in an 85°C oven with forced ventilation for 5 d, or directly use the recycled material from road milling;

[0100] S4: Add the aged asphalt mixture or recycled material heated to 150°C into a mixing pot at 150°C and mix evenly, add 6% of the warm-mix asphalt regeneration agent involved in step S2 (relative to the residual asphalt mass in the aged asphalt mixture or recycled material, determined by combustion method), and at the same time add No. 70 asphalt (to ensure that the oil-stone ratio of the warm-mix recycled asphalt mixture remains consistent with the original 4.8%), continue mixing for 100s, and obtain an anti-stripping warm-mix recycled asphalt mixture with both high and low temperature performance.

[0101] In this embodiment, the polymethylene polyphenyl isocyanate in Example 2 is replaced by sulfur, and the raw material ratio and other steps are consistent with those in Example 2.

[0102] Example 9

[0103] This embodiment includes a preparation process of a high-low temperature performance-combined anti-stripping warm-mix asphalt regeneration agent and a regenerated asphalt mixture thereof, which is specifically as follows:

[0104] S1: According to the raw material mass ratio of 100:10:30:5, 200g, 20g, 60g and 10g of waste food oil, solvent oil, dibenzoyl peroxide and carbon black were weighed in sequence and premixed;

[0105] S2: The raw materials premixed in step S1 are mixed at a stirring speed of 500 rpm at 25°C for 5 minutes to obtain an anti-stripping warm-mix asphalt regeneration agent with both high and low temperature performance, which is sealed and stored at room temperature.

[0106] S3: Prepare aged asphalt mixture by heating new asphalt mixture (AC-13 aggregate gradation, oil-to-stone ratio of 4.8%) in a 135°C oven with forced ventilation for 4 h and in an 85°C oven with forced ventilation for 5 d, or directly use the recycled material from road milling;

[0107] S4: Add the aged asphalt mixture or recycled material heated to 150°C into a mixing pot at 150°C and mix evenly, add 6% of the warm-mix asphalt regeneration agent involved in step S2 (relative to the residual asphalt mass in the aged asphalt mixture or recycled material, determined by combustion method), and at the same time add No. 70 asphalt (to ensure that the oil-stone ratio of the warm-mix recycled asphalt mixture remains consistent with the original 4.8%), continue mixing for 100s, and obtain an anti-stripping warm-mix recycled asphalt mixture with both high and low temperature performance.

[0108] In this embodiment, the polymethylene polyphenyl isocyanate in Example 2 is replaced by dibenzoyl peroxide, and the raw material ratio and other steps are consistent with those in Example 2.

[0109] Example 10

[0110] This embodiment includes a preparation process of a high-low temperature performance-combined anti-stripping warm-mix asphalt regeneration agent and a regenerated asphalt mixture thereof, which is specifically as follows:

[0111] S1: According to the raw material mass ratio of 100:10:30:5, 200 g, 20 g, 60 g and 10 g of catalytic cracking oil slurry, solvent oil, polymethylene polyphenyl isocyanate and limestone powder are weighed in sequence and premixed;

[0112] S2: The raw materials premixed in step S1 are mixed at a stirring speed of 500 rpm at 25°C for 5 minutes to obtain an anti-stripping warm-mix asphalt regeneration agent with both high and low temperature performance, which is sealed and stored at room temperature.

[0113] S3: Prepare aged asphalt mixture by heating new asphalt mixture (AC-13 aggregate gradation, oil-to-stone ratio of 4.8%) in a 135°C oven with forced ventilation for 4 h and in an 85°C oven with forced ventilation for 5 d, or directly use the recycled material from road milling;

[0114] S4: Add the aged asphalt mixture or recycled material heated to 150°C into a mixing pot at 150°C and mix evenly, add 6% of the warm-mix asphalt regeneration agent involved in step S2 (relative to the residual asphalt mass in the aged asphalt mixture or recycled material, determined by combustion method), and at the same time add No. 70 asphalt (to ensure that the oil-stone ratio of the warm-mix recycled asphalt mixture remains consistent with the original 4.8%), continue mixing for 100s, and obtain an anti-stripping warm-mix recycled asphalt mixture with both high and low temperature performance.

[0115] In this embodiment, the carbon black in Example 2 is replaced by limestone powder, and the raw material ratio and other steps are consistent with Example 2.

[0116] Comparative Example 1

[0117] This embodiment includes a preparation process of a high-low temperature performance-combined anti-stripping warm-mix asphalt regeneration agent and a regenerated asphalt mixture thereof, which is specifically as follows:

[0118] S1: Catalytic cracking oil slurry and solvent oil are used as raw materials of warm mix asphalt regeneration agent in a ratio of 100:10 and are premixed;

[0119] S2: The raw materials premixed in step S1 are mixed at a stirring speed of 500 rpm at 25°C for 5 minutes to obtain an anti-stripping warm-mix asphalt regeneration agent with both high and low temperature performance, which is sealed and stored at room temperature.

[0120] S3: Prepare aged asphalt mixture by heating new asphalt mixture (AC-13 aggregate gradation, oil-to-stone ratio of 4.8%) in a 135°C oven with forced ventilation for 4 h and in an 85°C oven with forced ventilation for 5 d, or directly use the recycled material from road milling;

[0121] S4: Add the aged asphalt mixture or recycled material heated to 150°C into a mixing pot at 150°C and mix evenly, add 3% of the warm-mix asphalt regeneration agent involved in step S2 (relative to the residual asphalt mass in the aged asphalt mixture or recycled material, determined by combustion method), and at the same time add No. 70 asphalt (to ensure that the oil-stone ratio of the warm-mix recycled asphalt mixture remains consistent with the original 4.8%), continue mixing for 100s, and obtain an anti-stripping warm-mix recycled asphalt mixture with both high and low temperature performance.

[0122] This comparative example uses catalytic cracking oil slurry and solvent oil as raw materials of warm mix asphalt regeneration agent in a ratio of 100:10, and other steps are consistent with Example 1.

[0123] Test Case

[0124] The performance tests were conducted on the warm-mix recycled asphalt mixtures obtained in Examples 1-10 and Comparative Example 1. The test indicators included 60°C dynamic stability, -10°C maximum bending tensile strain, water immersion residual stability and freeze-thaw splitting strength ratio, and the test results are shown in Table 1.

[0125] The test method is as follows:

[0126] (1) 60°C dynamic stability: According to the test method of "Testing Procedures for Asphalt and Asphalt Mixtures for Highway Engineering" (JTG E20-2011 T0719), the high temperature stability test of the warm mix recycled asphalt mixture rutting specimen was carried out under the test conditions of temperature of 60°C and wheel pressure of 0.7 MPa, and the 60°C dynamic stability was used as the main index to evaluate the high temperature deformation resistance of the specimen;

[0127] (2) Maximum flexural strain at -10°C: According to the test method of "Test Procedure for Asphalt and Asphalt Mixtures for Highway Engineering" (JTG E20-2011 T 0715), the low-temperature bending performance test of the warm-mix recycled asphalt mixture specimen was carried out at a loading rate of 50 mm / min under low temperature conditions of -10°C, and the maximum flexural strain generated when the specimen was destroyed was used as the technical indicator for evaluating the low-temperature performance of the specimen.

[0128] (3) Residual stability after immersion: First, according to the test method of "Testing Procedures for Asphalt and Asphalt Mixtures for Highway Engineering" (JTGE20-2011 T 0702), the Marshall specimens of warm-mix recycled asphalt mixture were prepared by compaction method; secondly, according to the test method of "Testing Procedures for Asphalt and Asphalt Mixtures for Highway Engineering" (JTG E20-2011 T 0709), the Marshall stability tester was used to test the specimens; finally, the specimens were immersed in a 60℃ constant temperature water tank for 0.5h and 48h, and the measured values ​​were used as the Marshall stability before and after immersion. The percentage of the ratio of the Marshall stability after immersion to the Marshall stability before immersion was used as the residual stability after immersion to evaluate the water stability of the above-mentioned asphalt mixture in terms of immersion. The larger the value, the better the water stability and the better the anti-stripping property.

[0129] (4) Freeze-thaw splitting strength ratio: First, according to the test method of "Test Code for Asphalt and Asphalt Mixtures for Highway Engineering" (JTGE20-2011 T 0729), the corresponding warm-mix recycled asphalt mixture Marshall specimens were prepared by compaction method; secondly, freeze-thaw tests were completed under the conditions of -18℃ freezing for 16h, 60℃ water bath for 24h and 25℃ insulation for 2h. Finally, the splitting strength of the Marshall specimens before and after freeze-thaw was tested by splitting test. The percentage of the splitting strength after freeze-thaw to the splitting strength before freeze-thaw was taken as the freeze-thaw splitting strength ratio to evaluate the water stability of the above asphalt mixture in freeze-thaw. The larger the value, the better the water stability and the better the anti-stripping property.

[0130] Table 1

[0131]

[0132] It can be seen from the data in Table 1 that the warm-mix asphalt regeneration agent prepared by the present invention is used to prepare regenerated asphalt mixtures. The 60°C dynamic stability, -10°C maximum bending and tensile strain, water immersion residual stability and freeze-thaw splitting strength ratio of the warm-mix regenerated asphalt mixtures in Examples 1-10 all meet the road technical requirements for modified asphalt mixtures in the "Technical Specifications for Highway Asphalt Pavement Construction" (JTG F40-2004), namely ≥2800 times / mm, ≥2500με, ≥85% and ≥80%. In particular, in the preferred embodiment 5, the values ​​of 60°C dynamic stability, -10°C maximum bending and tensile strain, water immersion residual stability and freeze-thaw splitting strength ratio reach 5368 times / mm, 2568με, 97.9% and 92.6% respectively;

[0133] Compared with Comparative Example 1, the high and low temperature performance and water stability of the prepared warm-mix regenerated asphalt mixture are significantly higher, indicating that the warm-mix asphalt regeneration agent prepared by the present invention can not only take into account the high and low temperature performance of the warm-mix regenerated asphalt mixture, but also effectively prevent it from being affected by water immersion or freeze-thaw and causing a large amount of peeling. In general, the high and low temperature performance-taking anti-stripping warm-mix asphalt regeneration agent prepared by the present invention can make the aged asphalt mixture have good road performance after regeneration, and can especially avoid the main problem that the traditional method easily causes the high temperature performance and anti-stripping of the regenerated asphalt mixture to deteriorate significantly.

[0134] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An anti-stripping warm mix asphalt regeneration agent with both high and low temperature performance, characterized in that; It includes the following ingredients: common asphalt rejuvenator; Viscosity reducers; Cross-linking curing agent; Retarder crosslinking agent; The mass ratio of common asphalt regeneration agent, viscosity reducer, cross-linking curing agent and slow cross-linking agent is: 100:10:(30-90):5。 2. The anti-stripping warm mix asphalt regeneration agent with both high and low temperature performance according to claim 1, characterized in that: The common asphalt regeneration agent is one or more of catalytic cracking oil slurry, aromatic oil and waste food oil.

3. The anti-stripping warm mix asphalt regeneration agent with both high and low temperature performance according to claim 1, characterized in that: The viscosity reducing agent is solvent oil.

4. The anti-stripping warm mix asphalt regeneration agent with both high and low temperature performance according to claim 1, characterized in that: The cross-linking curing agent is at least one of polymethylene polyphenyl isocyanate, sulfur and dibenzoyl peroxide.

5. The high and low temperature performance-combined anti-stripping warm mix asphalt regeneration agent and the method for preparing the regenerated asphalt mixture according to claim 1, characterized in that: The cross-linking retarder is at least one of carbon black and limestone powder.

6. A method for preparing a high and low temperature performance-combined anti-stripping warm mix asphalt regeneration agent according to any one of claims 1 to 5, characterized in that: The production process includes the following steps: Step S1: weigh the raw materials of the temperature-mixed asphalt regeneration agent such as the common asphalt regeneration agent, the viscosity reducer, the cross-linking curing agent, and the slow cross-linking agent according to the mass ratio and set aside; Step S2: Mix and stir the raw materials weighed in step S1 for a certain period of time under appropriate temperature conditions to obtain an anti-stripping warm-mix asphalt regeneration agent with both high and low temperature performance, and seal it and store it at room temperature.

7. The method for preparing a high and low temperature performance-combined anti-stripping warm mix asphalt regeneration agent according to claim 6, characterized in that: In step S2, the raw materials weighed in step S1 are mixed at a stirring speed of 500-800 rpm at 25° C.-50° C. for 5 min-15 min.

8. A method for preparing a recycled asphalt mixture according to any one of claims 1 to 7, characterized in that: The production process includes the following steps: S1: Prepare aged asphalt mixture by heating new asphalt mixture (AC-13 aggregate gradation, asphalt-to-stone ratio of 4.8%) in a 135°C oven with forced ventilation for 4 h and in an 85°C oven with forced ventilation for 5 d, or directly use the recycled material from road milling; S2: Add the aged asphalt mixture or recycled material heated to 140℃-155℃ into a mixing pot at 140℃-155℃ and mix evenly, add 3%-9% warm mix asphalt regeneration agent, and add No. 70 asphalt at the same time, continue mixing for 100s to obtain an anti-stripping warm mix recycled asphalt mixture with both high and low temperature performance.

9. The method for preparing a recycled asphalt mixture according to claim 8, characterized in that: In step S2, the condition for adding the difference of No. 70 asphalt is to ensure that the asphalt-rock ratio of the warm-mix recycled asphalt mixture is consistent with the crude oil-rock ratio of 4.8%.

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