A method for preparing high temperature resistant and cracking resistant asphalt mixture

Abstract

The invention relates to the field of building materials, and in particular to a method for preparing a high-temperature resistant and crack-resistant asphalt mixture. The invention adopts asphalt, 6-13 mm hot aggregate, 4-6 mm hot aggregate, 0-4 mm hot aggregate, recycled mineral powder, diluent and additives to prepare the asphalt mixture. The asphalt mixture prepared by the invention has good high-temperature stability, and will not produce defects such as waves, shifting, rutting, and bulging under repeated driving loads in high-temperature seasons. The asphalt mixture prepared by the invention has good crack resistance, good water stability, and is not prone to asphalt film peeling, particle loss, looseness, potholes, etc., and has good fatigue resistance and stable road surface structure strength.

Description

Technical Field

[0001] The invention relates to the field of building materials, in particular to a method for preparing a high-temperature resistant and cracking resistant asphalt mixture. Background Art

[0002] In recent years, China's highway construction has achieved rapid development. By the end of 2020, the total mileage of highways open to traffic in the country reached 5.198 million km, of which the total mileage of expressways open to traffic reached 161,000 km. The large-scale construction of highways has played an important supporting role in the rapid development of the economy and society. As global environmental problems become increasingly prominent, countries have proposed and implemented relevant measures to save energy and reduce emissions. China has also made it clear that it will vigorously control carbon emissions in the next five years and strive to achieve the development goal of carbon neutrality. Asphalt pavement recycling technology has many advantages in recycling resources, saving energy, and protecting the environment. It has become one of the important ways to implement the carbon neutral development strategy.

[0003] CN201310495650.3: discloses an asphalt mixture and a preparation method thereof, in particular, an anti-rutting and anti-embracing asphalt mixture and a preparation method thereof. The asphalt mixture of the present invention comprises the following components in terms of weight percentage of the asphalt mixture: 4.0% to 6.0% of special road petroleum asphalt, 1.0% to 3.0% of cement, 1.0% to 3.0% of mineral powder, and 88.0% to 94.0% of aggregate; the preparation method is as follows: (1) heating a stirring kettle and aggregate to 130 to 180°C for standby use, and heating the special road petroleum asphalt to a molten state for standby use; (2) adding aggregate, cement, and mineral powder to the stirring kettle at the same time and stirring evenly; (3) adding the special road petroleum asphalt to the stirring kettle, and stirring evenly with the aggregate, cement, and mineral powder pre-mixed evenly in the stirring kettle to obtain an asphalt mixture. Since the asphalt mixture of the present invention uses special road petroleum asphalt, the rutting dynamic stability of the mixture is greatly improved, and the rutting resistance of the asphalt pavement can be significantly improved. It is especially suitable for asphalt roads with heavy traffic or prone to rutting in high temperature areas in southern my country.

[0004] CN201010148395.1: Belongs to the technical field of highways and urban roads, and specifically relates to a method for preparing a low-carbon asphalt mixture. The specific steps are: by directly adding a low-carbon agent to the modified asphalt or the base asphalt, the emission of carbon dioxide is reduced, the mixing temperature and paving temperature of the asphalt mixture are reduced, and the energy consumption is reduced. The mixing temperature is generally 110℃~140℃, and the compaction temperature is generally 80℃~100℃. Compared with the hot-mix asphalt mixture, the carbon dioxide emission is reduced by more than 45%, and the energy consumption can be reduced by 12%~18%. This preparation method can reduce the emission of carbon dioxide and save energy. It is a green, environmentally friendly, and energy-saving asphalt mixture preparation method, which can be applied to the paving of urban roads, highways of various grades and other paving projects.

[0005] CN201010177141.2: It relates to a modified asphalt mixture and its preparation and construction method, and in particular to rubber modified asphalt and its preparation and construction method, and belongs to the field of engineering technology. The present invention solves the problem of thick and sticky mixture construction by adding TOR into the asphalt mixture, and further reduces the stirring temperature of the rubber asphalt mixture, reduces the processing equipment, improves the production process, and adopts a continuous dense gradation design method to prevent water damage. Its preparation process improves the performance of the rubber asphalt mixture. The beneficial effect is: using waste rubber powder to modify asphalt to pave asphalt pavement can not only promote the comprehensive utilization of waste tires, reduce the huge environmental pressure brought by "black pollution", and save resources; it can also improve the road performance of the asphalt mixture, improve the quality of the road surface and extend the service life, while reducing costs and improving the performance of the product. Compared with the existing rubber modified asphalt production process, it is more energy-saving and environmentally friendly, and convenient for construction.

[0006] The above patents and prior art, from the perspective of the structural form of the asphalt surface layer: poor stability at high temperatures and easy to change; asphalt porosity of 3-6%, low water permeability, poor durability, the friction coefficient of the surface layer can meet the requirements, but the surface structure depth is small, far from meeting the requirements; porosity of 6-10%, deep surface structure, strong deformation resistance, but its water permeability and durability are poor. Summary of the invention

[0007] The present invention aims to solve the technical problem that the asphalt prepared in the prior art has poor stability and easy changeability at high temperature, thereby providing a method for preparing a high temperature resistant and cracking resistant asphalt mixture. The high and low temperature resistant asphalt mixture prepared in the present invention has good high temperature stability, cracking resistance, water stability and fatigue resistance.

[0008] In order to achieve the above object, the present invention provides the following technical solutions:

[0009] One of the technical solutions provided by the present invention is: a method for preparing a high temperature resistant and cracking resistant asphalt mixture, the operating steps of which are:

[0010] According to weight, 50-60 parts of asphalt, stone, 25-30 parts of recycled mineral powder and 2-5 parts of diluent are put into a mixing tank, stirred and discharged to obtain an asphalt mixture.

[0011] The second technical solution provided by the present invention is: a method for preparing a high temperature resistant and cracking resistant asphalt mixture, the operating steps of which are:

[0012] According to weight, 50-60 parts of asphalt, stone, 25-30 parts of recycled mineral powder, 2-5 parts of diluent, and 0.005-0.02 parts of additives are put into a mixing tank, stirred and discharged to obtain an asphalt mixture.

[0013] Further preferably, the asphalt is heated to 140-160° C. and then sprayed into the mixing tank.

[0014] Further preferably, the stone composition is: 380-400 parts of 6-13 mm hot aggregate, 240-260 parts of 4-6 mm hot aggregate, and 250-270 parts of 0-4 mm hot aggregate.

[0015] Further preferably, the stone is sent to a drying and heating drum and heated to 180-200° C. to dry out the moisture, and is sieved through several layers of sieves of different sizes before being placed in a mixing tank.

[0016] Further preferably, the diluent is 0# diesel.

[0017] More preferably, the stirring time is 30-50s.

[0018] Further preferably, the additive is a cerium-containing anti-stripping agent, and the preparation method thereof is:

[0019] S1: By weight: 52-70 parts of N-octadecyl-1-octadecylamine, CAS: 112-99-2, 30-50 parts of zinc acrylate, 3-6 parts of triethanolamine, 7-12 parts of guanidine sulfamate, and 300-500 parts of 120# solvent oil are added to a reaction kettle, nitrogen is introduced, the temperature is raised to 70-80°C, and the reaction time is 100-200 minutes;

[0020] S2: Add 5-10 parts of tri(dimethylsilyl)amine, 0.5-2.4 parts of triallyl phosphoric acid, and 0.003-0.04 parts of chloroplatinic acid, stir at 50-60° C. for 60-100 minutes, and remove the solvent oil by reduced pressure distillation to obtain a zinc-containing anti-stripping agent.

[0021] Technical effects:

[0022] A method for preparing a high temperature resistant and cracking resistant asphalt mixture of the present invention,

[0023] 1. The asphalt mixture prepared by the present invention has good high temperature stability, that is, the asphalt pavement has a strong ability to resist flow deformation; under the repeated action of vehicle loads in high temperature seasons, no defects such as waves, shifting, rutting, and bumping will occur;

[0024] 2. The asphalt mixture prepared by the present invention has good crack resistance;

[0025] 3. The asphalt mixture prepared by the present invention has good water stability, that is, after the asphalt pavement resists water erosion, it is not easy to produce asphalt film peeling, particle loss, looseness, potholes, etc.;

[0026] 4. The asphalt mixture prepared by the present invention has good fatigue resistance, that is, the asphalt pavement has a strong ability to resist damage under repeated loads, and the pavement structure has stable strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a digital photo of high temperature resistant and cracking resistant asphalt mixture. DETAILED DESCRIPTION

[0028] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples. The experimental methods in the following examples without specifying specific conditions are carried out according to conventional methods and conditions, or selected according to the product specifications.

[0029] The testing method for asphalt material in the specific implementation manner is as follows:

[0030] 1. Marshall stability and penetration strength shall be tested in accordance with the requirements of the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering";

[0031] 2. After RT-FOT aging and PAV aging, the aged asphalt residue was subjected to DSR test. The selected test conditions were: test temperature 25°C, DSR test plate diameter and asphalt thickness were 8mm and 2mm respectively, strain control mode was adopted, γ=10%, ω=10%.

[0032] Example 1

[0033] A method for preparing a high temperature resistant and cracking resistant asphalt mixture, the operating steps of which are:

[0034] 50kg of asphalt, stone, 25kg of recycled mineral powder and 2kg of diluent are put into a mixing tank, stirred and discharged to obtain an asphalt mixture.

[0035] The asphalt is heated to 140°C and then sprayed into the mixing tank.

[0036] The stone composition is: 380kg 6-13mm hot aggregate, 240kg 4-6mm hot aggregate, and 250kg 0-4mm hot aggregate.

[0037] The stones are sent to a drying and heating drum and heated to 180°C to dry out the moisture, and are sieved through several layers of screens of different sizes before being put into a mixing tank.

[0038] The diluent is 0# diesel.

[0039] The additive is a cerium-containing anti-stripping agent, and its preparation method is as follows:

[0040] S1: Add 52kg N-octadecyl-1-octadecylamine, CAS: 112-99-2, 30kg zinc acrylate, 3kg triethanolamine, 7kg guanidine sulfamate, and 300kg 120# solvent oil into a reaction kettle, introduce nitrogen, heat to 70°C, and react for 100min;

[0041] S2: Add 5 kg of tri(dimethylsilyl)amine, 0.5 kg of triallyl phosphoric acid, and 0.003 kg of chloroplatinic acid, stir at 50° C. for 60 min, and remove the solvent oil by distillation under reduced pressure to obtain a zinc-containing anti-stripping agent.

[0042] The stirring time is 30s.

[0043] Example 2

[0044] A method for preparing a high temperature resistant and cracking resistant asphalt mixture, the operating steps of which are:

[0045] 54 kg of asphalt, stone, 26 kg of recycled mineral powder, 3 kg of diluent and 0.01 kg of additive are put into a mixing tank, stirred and discharged to obtain an asphalt mixture.

[0046] The asphalt is heated to 145°C and then sprayed into the mixing tank.

[0047] The stone composition is: 385kg 6-13mm hot aggregate, 245kg 4-6mm hot aggregate, and 255kg 0-4mm hot aggregate.

[0048] The stones are sent to a drying and heating drum and heated to 185° C. to dry out the moisture, and are sieved through several layers of screens of different sizes before being put into a mixing tank.

[0049] The diluent is 0# diesel.

[0050] The additive is a cerium-containing anti-stripping agent, and its preparation method is as follows:

[0051] S1: 60kg N-octadecyl-1-octadecylamine, CAS: 112-99-2, 35kg zinc acrylate, 4kg triethanolamine, 9kg guanidine sulfamate, 350kg 120# solvent oil were added into the reaction kettle, nitrogen was introduced, the temperature was raised to 75°C, and the reaction time was 140min;

[0052] S2: Add 6 kg of tri(dimethylsilyl)amine, 1 kg of triallyl phosphoric acid, and 0.01 kg of chloroplatinic acid, stir at 55° C. for 70 min, and remove the solvent oil by distillation under reduced pressure to obtain a zinc-containing anti-stripping agent.

[0053] The stirring time is 35s.

[0054] Example 3

[0055] A method for preparing a high temperature resistant and cracking resistant asphalt mixture, the operating steps of which are:

[0056] 58 kg of asphalt, stone, 28 kg of recycled mineral powder, 4 kg of diluent and 0.015 kg of additive are put into a mixing tank, stirred and discharged to obtain an asphalt mixture.

[0057] The asphalt is heated to 155°C and then sprayed into the mixing tank.

[0058] The stone composition is: 395kg 6-13mm hot aggregate, 255kg 4-6mm hot aggregate, and 265kg 0-4mm hot aggregate.

[0059] The stones are sent to a drying and heating drum and heated to 195° C. to dry out the moisture, and are sieved through several layers of screens of different sizes before being put into a mixing tank.

[0060] The diluent is 0# diesel.

[0061] The additive is a cerium-containing anti-stripping agent, and its preparation method is as follows:

[0062] S1: Add 65kg N-octadecyl-1-octadecylamine, CAS: 112-99-2, 45kg zinc acrylate, 5kg triethanolamine, 11kg guanidine sulfamate, and 450kg 120# solvent oil into a reaction kettle, introduce nitrogen, heat to 75°C, and react for 180min;

[0063] S2: Add 9 kg of tri(dimethylsilyl)amine, 2 kg of triallyl phosphoric acid, and 0.03 kg of chloroplatinic acid, stir at 55° C. for 90 min, and remove the solvent oil by distillation under reduced pressure to obtain a zinc-containing anti-stripping agent.

[0064] The stirring time is 45s.

[0065] Example 4

[0066] A method for preparing a high temperature resistant and cracking resistant asphalt mixture, the operating steps of which are:

[0067] 60kg of asphalt, stone, 30kg of recycled mineral powder, 5kg of diluent and 0.02kg of additive are put into a mixing tank, stirred and discharged to obtain an asphalt mixture.

[0068] The asphalt is heated to 160°C and then sprayed into the mixing tank.

[0069] The stone material is composed of: 400kg 6-13mm hot aggregate, 260kg 4-6mm hot aggregate, and 270kg 0-4mm hot aggregate.

[0070] The stones are sent to a drying and heating drum and heated to 200° C. to dry out the moisture, and are sieved through several layers of screens of different sizes before being put into a mixing tank.

[0071] The diluent is 0# diesel.

[0072] The additive is a cerium-containing anti-stripping agent, and its preparation method is as follows:

[0073] S1: 70kg N-octadecyl-1-octadecylamine, CAS: 112-99-2, 50kg zinc acrylate, 6kg triethanolamine, 12kg guanidine sulfamate, 500kg 120# solvent oil were added into the reaction kettle, nitrogen was introduced, the temperature was raised to 80°C, and the reaction time was 200min;

[0074] S2: Add 10 kg of tri(dimethylsilyl)amine, 2.4 kg of triallyl phosphoric acid, and 0.04 kg of chloroplatinic acid, stir at 60° C. for 100 min, and remove the solvent oil by distillation under reduced pressure to obtain a zinc-containing anti-stripping agent.

[0075] The stirring time is 50s.

[0076] Comparative Example 1

[0077] A method for preparing a high temperature resistant and cracking resistant asphalt mixture, the operating steps of which are:

[0078] 50kg of asphalt, stone, 25kg of recycled mineral powder and 2kg of diluent are put into a mixing tank, stirred and discharged to obtain an asphalt mixture.

[0079] The asphalt is heated to 140°C and then sprayed into the mixing tank.

[0080] The stone composition is: 380kg 6-13mm hot aggregate, 240kg 4-6mm hot aggregate, and 250kg 0-4mm hot aggregate.

[0081] The stones are sent to a drying and heating drum and heated to 180°C to dry out the moisture, and are sieved through several layers of screens of different sizes before being put into a mixing tank.

[0082] The diluent is 0# diesel.

[0083] The stirring time is 30s.

[0084] Comparative Example 2

[0085] A method for preparing a high temperature resistant and cracking resistant asphalt mixture, the operating steps of which are:

[0086] 50kg of asphalt, stone, 25kg of recycled mineral powder, 2kg of diluent and 0.005kg of additive are put into a mixing tank, stirred and discharged to obtain an asphalt mixture.

[0087] The asphalt is heated to 140°C and then sprayed into the mixing tank.

[0088] The stone composition is: 380kg 6-13mm hot aggregate, 240kg 4-6mm hot aggregate, and 250kg 0-4mm hot aggregate.

[0089] The stones are sent to a drying and heating drum and heated to 180°C to dry out the moisture, and are sieved through several layers of screens of different sizes before being put into a mixing tank.

[0090] The diluent is 0# diesel.

[0091] The additive is a cerium-containing anti-stripping agent, and its preparation method is as follows:

[0092] S1: Add 52kg N-octadecyl-1-octadecylamine, CAS: 112-99-2, 30kg zinc acrylate, 3kg triethanolamine, and 300kg 120# solvent oil into a reaction kettle, introduce nitrogen, heat to 70°C, and react for 100min;

[0093] S2: Add 5 kg of tri(dimethylsilyl)amine, 0.5 kg of triallyl phosphoric acid, and 0.003 kg of chloroplatinic acid, stir at 50° C. for 60 min, and remove the solvent oil by distillation under reduced pressure to obtain a zinc-containing anti-stripping agent.

[0094] The stirring time is 30s.

[0095] Comparative Example 3

[0096] A method for preparing a high temperature resistant and cracking resistant asphalt mixture, the operating steps of which are:

[0097] 50kg of asphalt, stone, 25kg of recycled mineral powder, 2kg of diluent and 0.005kg of additive are put into a mixing tank, stirred and discharged to obtain an asphalt mixture.

[0098] The asphalt is heated to 140°C and then sprayed into the mixing tank.

[0099] The stone composition is: 380kg 6-13mm hot aggregate, 240kg 4-6mm hot aggregate, and 250kg 0-4mm hot aggregate.

[0100] The stones are sent to a drying and heating drum and heated to 180°C to dry out the moisture, and are sieved through several layers of screens of different sizes before being put into a mixing tank.

[0101] The diluent is 0# diesel.

[0102] The additive is a cerium-containing anti-stripping agent, and its preparation method is as follows:

[0103] S1: Add 52kg N-octadecyl-1-octadecylamine, CAS: 112-99-2, 30kg zinc acrylate, 3kg triethanolamine, 7kg guanidine sulfamate, and 300kg 120# solvent oil into a reaction kettle, introduce nitrogen, heat to 70°C, and react for 100min;

[0104] S2: Add 5 kg of tri(dimethylsilyl)amine and 0.003 kg of chloroplatinic acid, stir at 50° C. for 60 min, and remove the solvent oil by distillation under reduced pressure to obtain a zinc-containing anti-stripping agent.

[0105] The stirring time is 30s.

[0106] The test results of the high temperature resistant and crack resistant mixed material prepared in the above embodiment are shown in the following table:

[0107]

[0108] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for preparing a high temperature resistant and cracking resistant asphalt mixture, the operating steps of which are: According to weight, 50-60 parts of asphalt, stone, 25-30 parts of recycled mineral powder, 2-5 parts of diluent, and 0.005-0.02 parts of additives are put into a mixing tank, stirred and discharged to obtain an asphalt mixture; The additive is a zinc-containing anti-stripping agent, and its preparation method is as follows: S1: by weight: add 52-70 parts of N-octadecyl-1-octadecylamine, 30-50 parts of zinc acrylate, 3-6 parts of triethanolamine, 7-12 parts of guanidine sulfamate, and 300-500 parts of 120# solvent oil into a reaction kettle, and react for 100-200 minutes under the set reaction conditions; S2: Add 5-10 parts of tri(dimethylsilyl)amine, 0.5-2.4 parts of triallyl phosphoric acid, and 0.003-0.04 parts of chloroplatinic acid, cool the reactor and stir for 60-100 minutes, then remove the solvent oil by distillation under reduced pressure to obtain a zinc-containing anti-stripping agent; The reaction conditions in S1 are nitrogen atmosphere and temperature of 70-80°C; The reaction temperature in S2 is 50-60°C.

2. The method for preparing a high temperature resistant and cracking resistant asphalt mixture according to claim 1, characterized in that: The asphalt is heated to 140-160°C and then sprayed into the mixing tank.

3. The method for preparing a high temperature resistant and cracking resistant asphalt mixture according to claim 1, characterized in that: The stone composition is: 380-400 parts of 6-13mm hot aggregate, 240-260 parts of 4-6mm hot aggregate, and 250-270 parts of 0-4mm hot aggregate.

4. The method for preparing a high temperature resistant and cracking resistant asphalt mixture according to claim 1, characterized in that: The stones are sent to a drying and heating drum and heated to 180-200°C to dry out the moisture, and are sieved through several layers of screens of different sizes before being put into a mixing tank.

5. The method for preparing a high temperature resistant and cracking resistant asphalt mixture according to claim 1, characterized in that: The diluent is 0# diesel.

6. The method for preparing a high temperature resistant and cracking resistant asphalt mixture according to claim 1, characterized in that: The stirring time is 30-50s.

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