CN104194358B - A kind of warm mixed recycled asphalt and its preparation method - Google Patents

Abstract

The invention discloses warm-mix regenerated asphalt, which is prepared by mixing asphalt and a composite warm-mix regenerant. The composite warm-mix regenerant is a composite material of a surfactant and an oil regenerant. The warm-mix regenerated asphalt of the present invention has good functional effects, no pollution and low cost, and the composite warm-mix regenerant organically combines the warm-mix agent and the regenerant to give full play to its overall effect. The invention also discloses a preparation method of the warm-mix regenerated asphalt, which comprises the following steps: heating the asphalt to the mixing temperature; adding the composite warm-mix regeneration agent to the asphalt heated to the mixing temperature for mixing. The preparation method of the warm-mix regenerated asphalt of the present invention is simple. The composite warm-mix regenerated agent is directly and once added to the asphalt and mixed evenly, and the mixing temperature is significantly reduced, which not only reduces the emission of harmful gases and reduces costs, And it has good road performance.

Description

A kind of warm mixed recycled asphalt and its preparation method

technical field

The invention belongs to the technical field of road engineering materials, and relates to warm mixing technology and regeneration technology of pavement asphalt, in particular to warm mixing regenerated asphalt and a preparation method thereof.

Background technique

In recent years, the warm mixing technology and recycling technology of asphalt and asphalt mixture, as a new technology for asphalt pavement construction, has been paid more and more attention by people.

The regeneration technology of asphalt pavement is to re-mix the old asphalt pavement with new asphalt pavement materials in a certain proportion after the pretreatment process of milling, recycling and screening, so that it can meet certain requirements. Excellent road performance and use it to re-pave the road surface technology. The traditional asphalt pavement regeneration technology is mainly heat-recycled asphalt mixture technology. The heat-regenerated asphalt mixture technology is to add asphalt rejuvenator to the old asphalt mixture and heat it to 150°C-180°C with new asphalt and mineral materials. Stir to regenerate. Thermal regeneration technology can restore the performance of aged asphalt, but the secondary aging of old asphalt mixture is serious during the regeneration process, resulting in poor road performance of asphalt mixture and low regeneration blending rate (within 20%). However, cold recycled asphalt mixture has poor pavement performance and cannot be used in high-grade asphalt pavement.

Warm mix asphalt pavement technology is to add warm mix agent to asphalt to reduce the high temperature viscosity of asphalt so that the asphalt mixture can be mixed at a temperature lower than 150°C, and its road performance is not lower than that of hot mix asphalt mixture. performance.

At present, the comprehensive application technology of warm mix and regeneration of asphalt and asphalt mixture, that is, warm mix recycled asphalt and warm mix recycled asphalt mixture technology has attracted much attention. In order to effectively combine warm mix technology with regeneration technology for asphalt pavement , there is an urgent need to develop a new type of composite warm mix rejuvenator, which is used to solve the compatibility of asphalt and asphalt mixture warm mix technology and regeneration technology and the compatibility of materials. pioneering technology.

The invention patent with the publication number CN102320765A discloses a warm-mix recycled asphalt mixture whose components are sulfur and asphalt binder. The warm-mix recycled asphalt mixture of this invention uses sulfur as an additive. Although the price is low, the mixing temperature is still high, which will cause serious secondary aging, low regeneration ratio, and affect road performance.

Contents of the invention

In order to solve the problems existing in the prior art, the present invention provides a warm-mix regenerated asphalt, which is prepared by mixing asphalt and a composite warm-mix regenerant. The asphalt is new asphalt. Composite warm mix rejuvenator can be directly added to asphalt at one time to realize the warm mixing of asphalt and the recycling of old asphalt, and then realize the dual effects of solid waste utilization of pavement materials and energy saving and emission reduction.

Asphalt binder includes new asphalt and aged asphalt. The content of aged asphalt is 10-40% of the asphalt binder.

In any of the above schemes, it is preferred that the composite warm-mix regeneration agent is a composite material of warm-mix agent and regeneration agent. In the process of warm mixing and regeneration of asphalt pavement, due to the separation of warm mixing technology and regeneration technology, the asphalt pavement cannot realize the technical problem of warm mixing and regeneration at the same time. Composite warm mix rejuvenator with the function of regeneration and asphalt warm mix. The composite warm mix regenerant is a composite material that can be directly and once added to asphalt to realize warm mix of asphalt and regeneration of old asphalt mixture. use.

The composite warm mix rejuvenator organically combines the warm mix agent and the regenerant, and can realize the reduction of the mixing temperature of asphalt and asphalt mixture and the recycling of old asphalt mixture. The warm mix agent in the composite warm mix rejuvenator can reduce the high-temperature viscosity of asphalt, so that asphalt and asphalt mixture can be mixed at 100-140°C, thereby reducing the short-term aging of asphalt and asphalt mixture during construction, and improving The mixing and compaction effect of asphalt mixture can be improved, while realizing energy saving and emission reduction and prolonging the service life of the road. The regenerant in the composite warm mix regenerant can realize the recycling of old asphalt mixture, and its dosage can reach 50%, and the utilization rate of old materials is significantly improved, thereby realizing the recycling of solid waste and reducing the mining of new materials ,Protect the environment.

At present, it is generally used to add the warm mix agent and the rejuvenator to the asphalt respectively, and the two play their respective roles respectively. However, the present invention organically combines the warm mix agent and the regenerant to form a composite material, that is, composite Warm mix regenerant, when in use, the composite warm mix regenerant is put into use directly and at one time, so as to play an overall role and achieve better results.

Composite warm-mix regenerant is a viscous, black substance at room temperature. The composite warm-mix regenerant needs to be stored in a sealed aluminum container, which is suitable for long-term storage at a temperature of 15-40°C. It is not suitable for storage at too high or too low a temperature, otherwise the composite warm-mix regenerant will be reduced. performance, affecting its warm mixing and regeneration effects.

In any of the above schemes, preferably, the warming agent is a surfactant. Surfactant is a liquid, transparent, yellow substance at room temperature. Surfactant, as a material for asphalt warm mixing in the composite warm mix rejuvenator, has good fluidity at room temperature.

In any of the above schemes, preferably, the surfactant is one or more of fatty acid glyceride, sorbitan fatty acid, polysorbate, and sucrose ester. This type of surfactant has better chemical stability, better high temperature and high pressure resistance, and is suitable for asphalt warm mixing.

In any of the above schemes, preferably, the regenerating agent is an oil regenerating agent. The oil regeneration agent is viscous liquid and dark yellow substance at room temperature. The oil regenerant is used as a substance in the composite warm mix regenerant to realize the regeneration of old asphalt.

In any of the above schemes, it is preferred that the oil regeneration agent is one or more of extracted oil, lubricating oil, machine oil and heavy oil when refining lubricating oil. The oil regeneration agent used in the present invention is cheap and easy to obtain, and can even use waste materials of various oil plants, turning waste into wealth and greatly saving costs.

The warm mix regenerated asphalt of the present invention has good functional effect, less pollution and low cost, and the composite warm mix regenerant organically combines the warm mix agent and the regenerant to form a composite material, which can be directly and once added to the new In the asphalt, the overall effect of the composite warm mix regenerated agent is fully exerted, and the warm mix regenerated asphalt prepared thus has good performance.

The present invention also provides a method for preparing the above warm-mixed regenerated asphalt, comprising the following steps:

(1) heating the asphalt to the mixing temperature;

(2) Add the composite warm mix regenerant to the asphalt that has been heated to the mixing temperature for mixing;

The composite warm-mix regeneration agent is a composite material of warm-mix agent and regeneration agent. The asphalt is new asphalt.

Preferably, the stirring temperature is 100-140°C.

In any of the above schemes, preferably, the stirring temperature is 110-130°C.

In any of the above schemes, preferably, the stirring temperature is 120°C.

The traditional hot-mix recycled asphalt is to mix asphalt and regenerated agent at a high temperature of 150-180 ℃, the temperature will cause secondary aging, the regeneration ratio is low, and the road performance of asphalt will be seriously affected. In addition, asphalt Heating to such a high temperature will consume a large amount of fuel oil and emit a large amount of harmful gases, which will cause serious environmental pollution. The preparation method of the warm-mix recycled asphalt of the present invention can reduce the mixing temperature to 100-140°C, which not only reduces the emission of harmful gases and reduces costs, but also the prepared warm-mix recycled asphalt has good performance and is not low properties of hot mix asphalt.

In any of the above schemes, it is preferred that the mixing time of the composite warm-mix regenerant and asphalt is 120-180s. A large number of experiments in the present invention prove that within the mixing time range, the composite warm-mix regenerant and new asphalt can be fully and evenly blended.

In any of the above schemes, it is preferred that the mixing time of the composite warm-mix regenerant and asphalt is 150s.

Preferably in any of the above-mentioned schemes, the preparation method of the composite warm-mixing regeneration agent comprises the following steps:

(1) taking the surfactant and the oil regeneration agent according to a certain ratio;

(2) Put the surfactant and the oil regeneration agent into the stirring equipment for stirring.

In any of the above schemes, it is preferred that the surfactant and the oil regeneration agent are mixed to form a composite material, and the composite material is a composite warm-mix regeneration agent.

The synthesis ratio of surfactant and oil regeneration agent is P _surfactant : P _{oil regeneration agent} ,

In the formula, P _surfactant —the added mass of surfactant, g;

P _{Oil regeneration agent} —the added mass of oil regeneration agent, g.

The formula for calculating the added mass of surfactant is P _surfactant =(P ₁ +P ₂ )×A,

In the formula, P ₁ —mass of new asphalt in asphalt binder, g;

P ₂ —mass of aged asphalt in asphalt binder, g;

A—The percentage of the added mass of surfactant to the total mass of asphalt binder, %.

The formula for calculating the added mass of the oil regeneration agent is P _{oil regeneration agent} = P ₂ × B,

In the formula, P ₂ —mass of aged asphalt in asphalt binder, g;

B—the percentage of the added mass of oil rejuvenator to the mass of aged asphalt in asphalt binder, %, B can be determined through experiments on the aging degree of aged asphalt and the grade of target asphalt.

The added mass of the surfactant is 0.3-0.6% of the total mass of the asphalt binder, preferably 0.5%.

The added quality of the oil regeneration agent is 6.0-12.0% of the aged asphalt in the asphalt cement, preferably 8.5%.

In any of the above schemes, preferably, the surfactant is one or more of fatty acid glycerides, sorbitan fatty acid, polysorbate, and sucrose esters.

In any of the above schemes, it is preferred that the oil regeneration agent is one or more of extracted oil, lubricating oil, machine oil and heavy oil when refining lubricating oil.

In any of the above schemes, it is preferred that the mixing temperature of the surfactant and the oil regeneration agent is 40-60°C. A large number of experiments in the present invention have proved that at a temperature of 40-60°C, both the surfactant and the oil regeneration agent are in a free-flowing state with good fluidity, which is conducive to the full mixing of the two, and the prepared composite warm-mix regeneration The agent is liquid and has good fluidity. When the temperature drops to normal temperature, the composite warm-mix regenerant becomes viscous. Since the surfactant and the oil regenerant have been fully mixed evenly at a temperature of 40-60°C, the composite warm-mix regenerant at room temperature appears to be viscous. Viscous state, but very uniform and delicate, no granular substances of uneven size exist.

In any of the above schemes, preferably, the mixing time of the surfactant and the oil regeneration agent is 90-150s. The present invention proves through a large number of experiments that within the range of stirring time, the two substances can be fully blended and evenly mixed. Preferably, 120s.

Surfactants and oil regeneration agents need to be fully stirred in the mixing equipment. The mixing equipment can be a stirrer, and the stirrer needs to rotate at a high speed so that the two substances are fully stirred and blended evenly. The optimum speed is 30 rpm.

The preparation method of the composite warm-mixing regenerant of the invention is simple, the preparation time is short, the cost is low, the preparation process is pollution-free, and will not cause harm to the environment and people. The present invention will show that the active agent is organically combined with the oil rejuvenator, which can realize the reduction of asphalt and asphalt mixture mixing temperature and the recycling of old asphalt mixture. At the same time, the production and preparation process of the composite warm mix rejuvenator of the present invention is pollution-free, from It fundamentally solves the problems of environmental pollution and waste of resources caused by the high mixing temperature of traditional asphalt and asphalt mixture and the low utilization rate of old materials.

The preparation method of the warm-mix regenerated asphalt of the present invention is simple. The composite warm-mix regenerated agent is directly and once added to the asphalt and mixed evenly, and the mixing temperature is significantly reduced, which not only reduces the emission of harmful gases and reduces costs, And it has good performance and road performance.

According to the preparation method of the present invention, the asphalt production department uses the composite warm mix regenerated agent to prepare the warm mix regenerated asphalt, transports it to the mixing station on the construction site, and stores it in an asphalt storage tank, and then further prepares the warm mix regenerated asphalt for mixing material.

The present invention also provides a warm-mix recycled asphalt mixture, which is prepared by mixing warm-mix recycled asphalt, new mineral material and old asphalt mixture. The warm-mix recycled asphalt is prepared by mixing asphalt and the above-mentioned composite warm-mix regenerant. The asphalt is new asphalt. Add the compound warm mix rejuvenator directly and once to asphalt to form warm mix regenerated asphalt, and then add warm mix regenerated asphalt directly and once to new mineral materials and old asphalt mixture to form warm mix regenerated asphalt Recycled asphalt mixture, wherein the mixing amount of old asphalt mixture is 0-50%. The amount of asphalt binder in the warm-mix recycled asphalt mixture is determined to be 4.7-5.3% by asphalt mixture design. The aged bitumen in the old asphalt mixture accounts for 4.7-5.3% of the old asphalt mixture.

Preferably, the composite warm-mix regeneration agent is a composite material of warm-mix agent and regeneration agent.

In any of the above schemes, preferably, the warm mixing agent is a surfactant, and the regeneration agent is an oil regeneration agent.

In any of the above schemes, preferably, the surfactant is one or more of fatty acid glycerides, sorbitan fatty acid, polysorbate, and sucrose esters.

In any of the above schemes, it is preferred that the oil regeneration agent is one or more of extracted oil, lubricating oil, machine oil and heavy oil when refining lubricating oil.

The warm mix regenerated asphalt mixture of the present invention makes full use of the old asphalt mixture, the content of the old asphalt mixture can reach 50%, and the composite warm mix rejuvenator organically combines the warm mix agent and the regenerant to form a composite material , can be directly added to asphalt at one time to form warm-mix regenerated asphalt, and then mix warm-mix regenerated asphalt with new mineral materials and old asphalt mixture, giving full play to the overall effect of the composite warm-mix regenerated agent, thus The prepared warm-mix recycled asphalt mixture has good road performance. The invention can realize the warm mixing of asphalt and the recycling of old asphalt mixture, and further realize the dual effects of solid waste utilization of pavement materials and energy saving and emission reduction.

The present invention also provides a method for preparing the above-mentioned warm-mix recycled asphalt mixture, comprising the following steps:

(1) Prepare warm-mix recycled asphalt;

(2) Mix the warm-mixed regenerated asphalt with the new mineral material and the old asphalt mixture at a certain temperature;

The warm-mix regenerated asphalt is prepared by mixing asphalt and a composite warm-mix regenerant. The asphalt is new asphalt.

The mixing temperature of the warm-mixed regenerated asphalt, new mineral material and old asphalt mixture is 100-140°C.

In any of the above schemes, it is preferred that the mixing temperature of the warm-mixed recycled asphalt, new mineral material and old asphalt mixture is 110-130°C.

In any of the above schemes, it is preferred that the mixing time of the warm-mixed recycled asphalt with the new mineral material and the old asphalt mixture is 80-100s.

In any of the above schemes, preferably, the mixing time of the warm-mixed regenerated asphalt, new mineral material and old asphalt mixture is 90s.

The preparation method of the warm-mix recycled asphalt mixture of the present invention is simple, and the warm-mix recycled asphalt added with the composite warm-mix regenerant can be evenly mixed with the new mineral material and the old asphalt mixture, and the mixing temperature is significantly reduced, greatly reducing the harmful The emission of gas is reduced, the utilization rate of the old asphalt mixture is significantly improved, and the dosage of the old asphalt mixture can reach 50%, and the prepared warm-mixed recycled asphalt mixture has good road performance.

detailed description

In order to further understand the content of the present invention, the present invention will be described in detail below in conjunction with specific examples.

Embodiment one:

A warm-mix regenerated asphalt is prepared by mixing asphalt and a composite warm-mix regenerant. The asphalt is new asphalt. The quality of asphalt binder is 10000g, wherein the content of new asphalt is 70%, namely 7000g, and the content of aged asphalt is 30%, namely 3000g. Composite warm-mix regeneration agent includes surfactant and oil regeneration agent. The surfactant is fatty acid glyceride, which is a yellow, transparent, liquid substance at room temperature; the oil regeneration agent is the extracted oil from refined lubricating oil, which is a dark yellow, viscous liquid substance at room temperature.

The preparation of the above-mentioned composite warm mixing regenerant comprises the following steps:

(1) Take fatty acid glyceride and the extracted oil when refining lubricating oil according to a certain ratio.

The amount of fatty acid glyceride added is 0.5% of the mass of asphalt binder, that is, P _{fatty acid glyceride} = (P ₁ + P ₂ ) × A = 10000 × 0.5% = 50g; the experiment shows that the aged asphalt is regenerated to the same grade as the new asphalt For asphalt, the amount of oil regeneration agent added is 8.5% of the mass of aged asphalt, that is, P _{extracted oil} = P ₂ × B = 3000 × 8.5% = 255g, so the ratio of fatty acid glyceride to extracted oil is 1:5.1.

(2) Put the fatty acid glyceride and the extracted oil from refining lubricating oil into a stirrer and stir until they are uniform.

The rotation speed of the stirrer is 30 rpm, the stirring temperature is 40°C, and the stirring time is 150s, so that the fatty acid glyceride and the extracted oil are fully stirred and blended evenly. The prepared composite warm-mix regenerant is a black, viscous substance at room temperature, and its properties are shown in Table 1.

The preparation of the above-mentioned warm mixed recycled asphalt comprises the following steps:

(1) The above-mentioned asphalt is heated to a mixing temperature of 120° C. to make it flow.

(2) Add the composite warm-mix rejuvenator prepared above directly into the asphalt heated to 120°C and mix quickly to a uniform state, and the mixing time is 150s.

The properties of the prepared warm mix recycled asphalt are shown in Table 2.

Embodiment two:

A warm-mix regenerated asphalt is prepared by mixing asphalt and a composite warm-mix regenerant. The asphalt is new asphalt. The quality of asphalt binder is 10000g, wherein the content of new asphalt is 60%, that is 6000g, and the content of aged asphalt is 40%, that is 4000g. Composite warm-mix regeneration agent includes surfactant and oil regeneration agent. The surfactant is sorbitan fatty acid, which is a yellow, transparent, liquid substance at room temperature; the oil regeneration agent is heavy oil, which is a dark yellow, viscous liquid substance at room temperature.

The preparation of the above-mentioned composite warm mixing regenerant comprises the following steps:

(1) Sorbitan fatty acid and heavy oil are weighed according to a certain ratio.

The amount of sorbitan fatty acid added is 0.6% of the mass of asphalt binder, that is _{, sorbitan fatty acid} P = (P ₁ + P ₂ ) × A = 10000 × 0.6% = 60g; the experiment shows that the aged asphalt is regenerated to the same grade as the new asphalt For asphalt, the amount of oil regeneration agent added is 10% of the aged asphalt mass, that is, P _{heavy oil} =P ₂ ×B=4000×10%=400g, so the ratio of fatty acid sorbitan to heavy oil is 1:6.7.

(2) Put fatty acid sorbitan and heavy oil into a blender and stir until uniform.

The rotation speed of the stirrer is 30 rpm, the stirring temperature is 45°C, and the stirring time is 135s, so that the fatty acid sorbitan and the heavy oil are fully stirred and blended evenly. The prepared composite warm-mix regenerant is a black, viscous substance at room temperature, and its properties are shown in Table 1.

The preparation of the above-mentioned warm mixed recycled asphalt comprises the following steps:

(1) The above-mentioned asphalt is heated to a mixing temperature of 110° C. to make it flow.

(2) Add the composite warm-mix rejuvenator prepared above directly into the asphalt heated to 110°C and mix quickly to a uniform state, and the mixing time is 165s.

The properties of the prepared warm mix recycled asphalt are shown in Table 2.

Embodiment three:

A warm-mix regenerated asphalt is prepared by mixing asphalt and a composite warm-mix regenerant. The asphalt is new asphalt. The quality of asphalt binder is 10000g, wherein the content of new asphalt is 80%, that is 8000g, and the content of aged asphalt is 20%, that is 2000g. Composite warm-mix regeneration agent includes surfactant and oil regeneration agent. The surfactant is polysorbate, which is a yellow, transparent, liquid substance at room temperature; the oil regeneration agent is lubricating oil, which is a dark yellow, viscous liquid substance at room temperature.

The preparation of the above-mentioned composite warm mixing regenerant comprises the following steps:

(1) Take polysorbate and lubricating oil according to a certain ratio.

The amount of polysorbate added is 0.3% of the mass of asphalt binder, that is, P _polysorbate = (P ₁ + P ₂ ) × A = 10000 × 0.3% = 30g; the experiment shows that the aged asphalt is regenerated to the same grade as the new asphalt For asphalt, the amount of oil regeneration agent added is 6.0% of the mass of aged asphalt, that is, P _{lubricating oil} = P ₂ × B = 2000 × 6.0% = 120g, so the ratio of polysorbate to lubricating oil is 1:4.0.

(2) Put polysorbate and lubricating oil into a blender and stir until uniform.

The rotation speed of the stirrer is 30 rpm, the stirring temperature is 50°C, and the stirring time is 120s, so that the polysorbate and the lubricating oil are fully stirred and blended evenly. The prepared composite warm-mix regenerant is a black, viscous substance at room temperature, and its properties are shown in Table 1.

The preparation of the above-mentioned warm mixed recycled asphalt comprises the following steps:

(1) The above-mentioned asphalt is heated to a mixing temperature of 130° C. to make it flow.

(2) Add the composite warm-mix rejuvenator prepared above directly into the asphalt heated to 130°C and mix quickly to a uniform state, and the mixing time is 135s.

The properties of the prepared warm mix recycled asphalt are shown in Table 2.

Embodiment four:

A warm-mix regenerated asphalt is prepared by mixing asphalt and a composite warm-mix regenerant. The asphalt is new asphalt. The quality of asphalt binder is 10000g, wherein the content of new asphalt is 90%, that is 9000g, and the content of aged asphalt is 10%, that is 1000g. Composite warm-mix regeneration agent includes surfactant and oil regeneration agent. Surfactants are fatty acid glycerides and sucrose esters, which are yellow, transparent, liquid substances at room temperature; oil regeneration agents are lubricating oils and machine oils, which are dark yellow, viscous liquid substances at room temperature.

The preparation of the above-mentioned composite warm mixing regenerant comprises the following steps:

(1) The mixture of fatty acid glyceride and sucrose ester and the mixture of lubricating oil and machine oil are weighed according to a certain ratio.

The addition amount of the mixture of fatty acid glycerides and sucrose esters is 0.3% of the mass of asphalt cement, that is, P _{fatty acid glycerides + sucrose esters} = (P ₁ + P ₂ ) × A = 10000 × 0.3% = 30g; When asphalt is regenerated to the same grade as new asphalt, the amount of oil regeneration agent added is 10% of the aged asphalt mass, that is, P _{lubricating oil + engine oil} = P ₂ × B = 1000 × 10% = 100g, so fatty acid glycerides The ratio of the mixture of sucrose ester to the mixture of lubricating oil and engine oil is 1:3.3.

(2) Put the mixture of fatty acid glycerides and sucrose esters and the mixture of lubricating oil and machine oil into a stirrer and stir until it is in a uniform state.

The rotation speed of the stirrer is 30 rpm, the stirring temperature is 55°C, and the stirring time is 105s, so that the fatty acid glycerides and sucrose esters are fully stirred and blended with lubricating oil and engine oil. The prepared composite warm-mix regenerant is a black, viscous substance at room temperature, and its properties are shown in Table 1.

The preparation of the above-mentioned warm mixed recycled asphalt comprises the following steps:

(1) The above-mentioned asphalt is heated to a mixing temperature of 140° C. to make it flow.

(2) Add the composite warm-mix rejuvenator prepared above directly into the asphalt heated to 140°C and mix quickly to a uniform state, and the mixing time is 120s.

The properties of the prepared warm mix recycled asphalt are shown in Table 2.

Embodiment five:

A kind of warm mixed regenerated asphalt, same as embodiment one, the difference is:

When preparing the composite warm mix rejuvenator, the amount of fatty acid glyceride added is 0.45% of the mass of asphalt cement, that is, P _{fatty acid glyceride} = (P ₁ +P ₂ ) × A = 10000 × 0.45% = 45g; experimentally measured When aging asphalt is regenerated to asphalt of the same grade as new asphalt, the amount of oil regeneration agent added is 6.0% of the mass of the aged asphalt, that is, P _{extracted oil} = P2 × B = 3000 × 6.0% = 180g, so fatty _acid glyceride and The oil extraction ratio is 1:4.0. The stirring temperature of fatty acid glyceride and extracted oil is 60°C, and the stirring time is 90s.

When preparing warm-mix regenerated asphalt, the asphalt was heated to a mixing temperature of 100°C, and the composite warm-mix regenerated agent was directly added to the asphalt, and mixed for 180s.

Embodiment six:

A kind of warm mixed regenerated asphalt, same as embodiment one, the difference is:

When preparing the composite warm-mix rejuvenator, the amount of fatty acid glyceride added is 0.55% of the mass of asphalt cement, that is, P _{fatty acid glyceride} = (P ₁ +P ₂ ) × A = 10000 × 0.55% = 55g; experimentally measured When aging asphalt is regenerated to asphalt of the same grade as new asphalt, the amount of oil regeneration agent added is 7.0% of the mass of aged asphalt, that is, P _{extracted oil} = P ₂ × B = 3000 × 7.0% = 210g, so fatty acid glyceride and The ratio of extracted oil is 1:3.8. The stirring temperature of fatty acid glyceride and extracted oil is 60°C, and the stirring time is 110s.

When preparing warm-mix regenerated asphalt, the asphalt was heated to a mixing temperature of 115°C, and the composite warm-mix regenerated agent was directly added to the asphalt, and mixed for 170s.

Embodiment seven:

A kind of warm mixed regenerated asphalt, same as embodiment one, the difference is:

When preparing the composite warm-mix rejuvenator, the amount of fatty acid glyceride added is 0.5% of the mass of asphalt cement, that is, P _{fatty acid glyceride} = (P ₁ +P ₂ ) × A = 10000 × 0.5% = 50g; experimentally measured When aging asphalt is regenerated to asphalt of the same grade as new asphalt, the amount of oil regeneration agent added is 8.0% of the mass of the aged asphalt, that is, P _{extracted oil} = P2 × B = 3000 × 8.0% = 240g, so fatty _acid glyceride and The ratio of extracted oil is 1:4.8. The stirring temperature of fatty acid glyceride and extracted oil is 60°C, and the stirring time is 125s.

When preparing warm-mix regenerated asphalt, the asphalt was heated to a mixing temperature of 125°C, and the composite warm-mix regenerated agent was directly added to the asphalt, and mixed for 160s.

Embodiment eight:

A kind of warm mixed regenerated asphalt, same as embodiment one, the difference is:

When preparing the composite warm-mix rejuvenator, the amount of fatty acid glyceride added is 0.4% of the mass of asphalt binder, that is, P _{fatty acid glyceride} = (P ₁ +P ₂ ) × A = 10000 × 0.4% = 40g; experimentally measured When aging asphalt is regenerated to asphalt of the same grade as new asphalt, the amount of oil regeneration agent added is 6.5% of the mass of aged asphalt, that is, P _{extracted oil} = P ₂ × B = 3000 × 6.5% = 195g, so fatty acid glyceride and The ratio of extracted oil is 1:4.9. The stirring temperature of fatty acid glyceride and extracted oil is 55°C, and the stirring time is 100s.

When preparing warm-mix regenerated asphalt, the asphalt was heated to a mixing temperature of 135°C, and the composite warm-mix regenerated agent was directly added to the asphalt, and mixed for 140s.

Embodiment nine:

A kind of warm mixed regenerated asphalt, same as embodiment one, the difference is:

When preparing the composite warm mix rejuvenator, the amount of fatty acid glyceride added is 0.6% of the mass of asphalt cement, that is, P _{fatty acid glyceride} = (P ₁ + P ₂ ) × A = 10000 × 0.6% = 60g; experimentally measured When aging asphalt is regenerated to asphalt of the same grade as new asphalt, the amount of oil regeneration agent added is 8.0% of the mass of the aged asphalt, that is, P _{extracted oil} = P2 × B = 3000 × 8.0% = 240g, so fatty _acid glyceride and The oil extraction ratio is 1:4.0. The stirring temperature of fatty acid glyceride and extracted oil is 50°C, and the stirring time is 125s.

When preparing warm-mix regenerated asphalt, the asphalt was heated to a mixing temperature of 105°C, and the composite warm-mix regenerated agent was directly added to the asphalt, and mixed for 180s.

Embodiment ten:

A kind of warm mixed regenerated asphalt, same as embodiment one, the difference is:

When preparing the composite warm-mix rejuvenator, the amount of fatty acid glyceride added is 0.5% of the mass of asphalt cement, that is, P _{fatty acid glyceride} = (P ₁ +P ₂ ) × A = 10000 × 0.5% = 50g; experimentally measured When aging asphalt is regenerated to asphalt of the same grade as new asphalt, the amount of oil regeneration agent added is 7.5% of the mass of aged asphalt, that is, P _{extracted oil} = P ₂ × B = 3000 × 7.5% = 225g, so fatty acid glyceride and The ratio of oil extraction is 1:4.5. The stirring temperature of fatty acid glyceride and extracted oil is 40°C, and the stirring time is 145s.

When preparing warm-mix regenerated asphalt, the asphalt was heated to a mixing temperature of 120°C, and the composite warm-mix regenerated agent was directly added to the asphalt, and mixed for 160s.

Embodiment eleven:

A kind of warm mixed regenerated asphalt, same as embodiment one, the difference is:

When preparing the composite warm mix rejuvenator, the amount of fatty acid glyceride added is 0.55% of the mass of asphalt binder, that is, P _{fatty acid glyceride} = (P ₁ + P ₂ ) × A = 10000 × 0.55% = 55g; experimentally measured When aging asphalt is regenerated to asphalt of the same grade as new asphalt, the amount of oil regeneration agent added is 8.5% of the mass of the aged asphalt, that is, P _{extracted oil} = P2 × B = 3000 × 8.5% = 255g, so fatty _acid glyceride and The ratio of extracted oil is 1:4.6. The stirring temperature of fatty acid glyceride and extracted oil is 45°C, and the stirring time is 115s.

When preparing warm-mix regenerated asphalt, the asphalt was heated to a mixing temperature of 115°C, and the composite warm-mix regenerated agent was directly added to the asphalt, and mixed for 145s.

Embodiment 12:

A warm-mix recycled asphalt mixture is prepared by mixing warm-mix recycled asphalt, new mineral material and old asphalt mixture, and the warm-mix recycled asphalt is prepared by mixing asphalt and a composite warm-mix regeneration agent. The asphalt is new asphalt.

Prepare 2×10 ⁵ g warm mix recycled asphalt mixture. The dosage of the old asphalt mixture is 30%, that is, 6×10 ⁴ g, wherein the content of aged asphalt in the old material is 5.0%, that is, the mass of aged asphalt P ₂ =3000g. The amount of asphalt binder in the warm-mix recycled asphalt mixture is determined to be 4.8% by asphalt mixture design, that is, the mass of asphalt binder is 9600g. The asphalt binder includes new asphalt and aged asphalt, and the mass of the new asphalt is P ₁ =9600-3000=6600g.

Composite warm-mix regeneration agent includes surfactant and oil regeneration agent. The surfactant is fatty acid glyceride, which is a yellow, transparent, liquid substance at room temperature; the oil regeneration agent is the extracted oil from refined lubricating oil, which is a dark yellow, viscous liquid substance at room temperature.

The preparation of the above-mentioned composite warm mixing regenerant comprises the following steps:

(1) Take fatty acid glyceride and the extracted oil when refining lubricating oil according to a certain ratio.

The amount of fatty acid glyceride added is 0.5% of the mass of asphalt binder, that is, P _{fatty acid glyceride} = (P ₁ + P ₂ ) × A = 9600 × 0.5% = 48g; the experiment shows that the aged asphalt is regenerated to the same grade as the new asphalt For asphalt, the amount of oil regeneration agent added is 8.5% of the mass of aged asphalt, that is, P _{extracted oil} = P ₂ × B = 3000 × 8.5% = 255g, so the ratio of fatty acid glyceride to extracted oil is 1:5.3.

(2) Put the fatty acid glyceride and the extracted oil from refining lubricating oil into a stirrer and stir until they are uniform.

The rotation speed of the stirrer is 30 rpm, the stirring temperature is 40°C, and the stirring time is 150s, so that the fatty acid glyceride and the extracted oil are fully stirred and blended evenly. The prepared composite warm-mixing regenerant is black and viscous at room temperature.

The preparation of the above-mentioned warm mixed recycled asphalt comprises the following steps:

(1) The above-mentioned asphalt is heated to a mixing temperature of 120° C. to make it flow.

(2) Add the composite warm-mix rejuvenator prepared above directly into the asphalt heated to 120°C and mix quickly to a uniform state, and the mixing time is 150s.

Preparation of the above-mentioned warm-mix recycled asphalt mixture: Mix the above-mentioned prepared warm-mix recycled asphalt with new mineral material and old asphalt mixture, the mixing temperature is 120°C, the mixing time is 100s, and the mixing is uniform. The compaction performance of the prepared warm-mix recycled asphalt mixture is shown in Table 3, and the road performance is shown in Table 4.

Embodiment thirteen:

A warm-mix recycled asphalt mixture is prepared by mixing warm-mix recycled asphalt, new mineral material and old asphalt mixture, and the warm-mix recycled asphalt is prepared by mixing asphalt and a composite warm-mix regeneration agent. The asphalt is new asphalt.

Prepare 2×10 ⁵ g warm mix recycled asphalt mixture. The dosage of the old asphalt mixture is 50%, that is, 1×10 ⁵ g, and the content of aged asphalt in the old material is 4.7%, that is, the mass of aged asphalt P ₂ =4700g. The amount of asphalt binder in the warm-mix recycled asphalt mixture is determined to be 5.0% by asphalt mixture design, that is, the mass of asphalt binder is 10000g. The asphalt binder includes new asphalt and aged asphalt, and the mass of the new asphalt is P ₁ =10000-4700=5300g.

Composite warm-mix regeneration agent includes surfactant and oil regeneration agent. The surfactant is polysorbate, which is a yellow, transparent, and liquid substance at room temperature; the oil regeneration agent is engine oil, which is a dark yellow, viscous liquid substance at room temperature.

The preparation of the above-mentioned composite warm mixing regenerant comprises the following steps:

(1) Weigh polysorbate and engine oil according to a certain ratio.

The amount of polysorbate added is 0.6% of the mass of asphalt binder, that is, P _polysorbate = (P ₁ + P ₂ ) × A = 10000 × 0.6% = 60g; the experiment shows that the aged asphalt is regenerated to the same grade as the new asphalt For asphalt, the amount of oil regeneration agent added is 6.0% of the mass of aged asphalt, that is, P _{engine oil} = P ₂ × B = 4700 × 6.0% = 282g, so the ratio of polysorbate to engine oil is 1:4.7.

(2) Put polysorbate and engine oil into a blender and stir until uniform.

The rotation speed of the stirrer is 30 rpm, the stirring temperature is 50°C, and the stirring time is 120s, so that the polysorbate and the engine oil are fully stirred and blended evenly. The prepared composite warm-mixing regenerant is black and viscous at room temperature.

The preparation of the above-mentioned warm mixed recycled asphalt comprises the following steps:

(1) The above-mentioned asphalt is heated to a mixing temperature of 140° C. to make it flow.

(2) Add the composite warm-mix rejuvenator prepared above directly into the asphalt heated to 140°C and mix quickly to a uniform state, and the mixing time is 120s.

Preparation of the above-mentioned warm-mix recycled asphalt mixture: Mix the above-mentioned prepared warm-mix recycled asphalt with new mineral material and old asphalt mixture. The mixing temperature is 100°C, the mixing time is 95s, and the mixing is uniform. The compaction performance of the prepared warm-mix recycled asphalt mixture is shown in Table 3, and the road performance is shown in Table 4.

Embodiment 14:

A warm-mix recycled asphalt mixture is prepared by mixing warm-mix recycled asphalt, new mineral material and old asphalt mixture, and the warm-mix recycled asphalt is prepared by mixing asphalt and a composite warm-mix regeneration agent. The asphalt is new asphalt.

Prepare 2×10 ⁵ g warm mix recycled asphalt mixture. The amount of old asphalt mixture is 40%, that is, 8×10 ⁴ g, and the content of aged asphalt in the old material is 4.8%, that is, the mass of aged asphalt P ₂ =3840g. The amount of asphalt binder in the warm-mix recycled asphalt mixture is determined to be 5.1% by asphalt mixture design, that is, the mass of asphalt binder is 10200g. The asphalt binder includes new asphalt and aged asphalt, and the mass of new asphalt P ₁ =10200-3840=6360g.

Composite warm-mix regeneration agent includes surfactant and oil regeneration agent. Surfactants are fatty acid glycerides and polysorbates, which are yellow, transparent, liquid substances at room temperature; oil regeneration agents are heavy oils and lubricating oils, which are dark yellow, viscous liquid substances at room temperature.

The preparation of the above-mentioned composite warm mixing regenerant comprises the following steps:

(1) The mixture of fatty acid glyceride and polysorbate and the mixture of heavy oil and lubricating oil are weighed according to a certain ratio.

The addition amount of fatty acid glyceride and polysorbate is 0.4% of the mass of asphalt cement, that is, P _{fatty acid glyceride + polysorbate} = (P ₁ + P ₂ ) × A = 10200 × 0.4% = 40.8g; experimentally measured When aging asphalt is regenerated to asphalt of the same grade as new asphalt, the amount of oil regeneration agent added is 7.0% of the mass of aged asphalt, that is, P _{heavy oil + lubricating oil} = P ₂ × B = 3840 × 7.0% = 268.8g, so fatty acid The ratio of the mixture of glyceride and polysorbate to the mixture of heavy oil and lubricating oil is 1:6.6.

(2) Put the mixture of fatty acid glyceride and polysorbate and the mixture of heavy oil and lubricating oil into a stirrer and stir until it is uniform.

The rotation speed of the stirrer is 30 rpm, the stirring temperature is 55°C, and the stirring time is 110s, so that the fatty acid glyceride and polysorbate are fully stirred and blended with heavy oil and lubricating oil. The prepared composite warm-mixing regenerant is black and viscous at room temperature.

The preparation of the above-mentioned warm mixed recycled asphalt comprises the following steps:

(1) The above-mentioned asphalt is heated to a mixing temperature of 130° C. to make it flow.

(2) Add the composite warm-mix rejuvenator prepared above directly into the asphalt heated to 130°C and mix quickly to a uniform state, and the mixing time is 130s.

Preparation of the above-mentioned warm-mix recycled asphalt mixture: Mix the above-mentioned prepared warm-mix recycled asphalt with new mineral material and old asphalt mixture, the mixing temperature is 140°C, the mixing time is 80s, and the mixing is uniform. The compaction performance of the prepared warm-mix recycled asphalt mixture is shown in Table 3, and the road performance is shown in Table 4.

Embodiment fifteen:

A kind of warm mixed recycled asphalt mixture, same as embodiment 12, the difference is:

Prepare 2×10 ⁵ g warm mix recycled asphalt mixture. The amount of old asphalt mixture is 45%, that is, 9×10 ⁴ g, and the content of aged asphalt in the old material is 4.9%, that is, the mass of aged asphalt P ₂ =4410g. The amount of asphalt binder in the warm-mix recycled asphalt mixture is determined to be 5.2% through the design of asphalt mixture ratio, that is, the mass of asphalt binder is 10400g. The asphalt binder includes new asphalt and aged asphalt, and the mass of new asphalt P ₁ =10400-4410=5990g.

When preparing the composite warm-mix rejuvenator, the amount of fatty acid glyceride added is 0.45% of the mass of asphalt binder, that is, P _{fatty acid glyceride} =(P ₁ +P ₂ )×A=10400×0.45%=46.8g; When the aged asphalt is regenerated to the same grade as new asphalt, the amount of oil regeneration agent added is 6.5% of the aged asphalt mass, that is, P _{extracted oil} = P ₂ × B = 4410 × 6.5% = 286.65g, so fatty acid glycerol The ratio of ester to extracted oil is 1:6.1. The stirring temperature of fatty acid glyceride and extracted oil is 52°C, and the stirring time is 100s.

When preparing warm-mix regenerated asphalt, the asphalt was heated to a mixing temperature of 115°C, and the composite warm-mix regenerated agent was directly added to the asphalt, and mixed for 140s.

When preparing warm-mix recycled asphalt mixture, the mixing temperature of warm-mix recycled asphalt, new mineral aggregate and old asphalt mixture is 125°C, and the mixing time is 90s.

Embodiment sixteen:

A kind of warm mixed recycled asphalt mixture, same as embodiment 12, the difference is:

Prepare 2×10 ⁵ g warm mix recycled asphalt mixture. The amount of old asphalt mixture is 35%, that is, 7×10 ⁴ g, and the content of aged asphalt in the old material is 5.2%, that is, the mass of aged asphalt P ₂ =3640g. The amount of asphalt binder in the warm-mix recycled asphalt mixture is determined to be 4.9% by asphalt mixture design, that is, the mass of asphalt binder is 9800g. The asphalt binder includes new asphalt and aged asphalt, and the mass of new asphalt P ₁ =9800-3640=6160g.

When preparing the composite warm-mix rejuvenator, the amount of fatty acid glyceride added is 0.4% of the mass of asphalt binder, that is, P _{fatty acid glyceride} =(P ₁ +P ₂ )×A=9800×0.4%=39.2g; When the aged asphalt is regenerated to the same grade as new asphalt, the amount of oil regeneration agent added is 7.5% of the quality of the aged asphalt, that is, P _{extracted oil} =P ₂ ×B=3640×7.5%=273g, so fatty acid glyceride The ratio to the extracted oil is 1:7.0. The stirring temperature of fatty acid glyceride and extracted oil is 48°C, and the stirring time is 140s.

When preparing warm-mix regenerated asphalt, the asphalt was heated to a mixing temperature of 105°C, and the composite warm-mix regenerated agent was directly added to the asphalt, and mixed for 160s.

When preparing warm-mix recycled asphalt mixture, the mixing temperature of warm-mix recycled asphalt, new mineral aggregate and old asphalt mixture is 115°C, and the mixing time is 93s.

Table 1: Performance of composite warm mix regenerant

Table 2: Properties of warm mix recycled asphalt

Table 3: Compaction performance of AC-13 warm-mix recycled asphalt mixture

Table 4: Road performance of AC-13 warm-mix recycled asphalt mixture

It is not difficult for those skilled in the art to understand that the warm-mix regenerated asphalt of the present invention and its preparation method include any combination of the summary of the invention and the specific embodiments of the description of the present invention described above, and these combinations are not constituted due to space limitations and to make the description concise. Each scheme is described one by one. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (7)

1. a kind of warm mix regeneration asphalt, it is characterised in that：The warm mix regeneration asphalt is mixed and stirred by pitch with compound warm mix regenerative agent Form, the compound warm mix regenerative agent is the composite of warm-mixing agent and regenerative agent, and the warm-mixing agent is surfactant, described Regenerative agent is oil regenerative agent；The surfactant is fatty glyceride, fatty acid sorbitan, polysorbate, sucrose ester In one or several kinds, tapped oil, lubricating oil, machine oil when the oil regenerative agent is bright stock, one in heavy oil Plant or several；Warm mix regeneration temperature is 100-110 DEG C.

2. the preparation method of warm mix regeneration asphalt as claimed in claim 1, comprises the following steps：

Pitch is heated to mix and stir temperature；

Compound warm mix regenerative agent is added in the pitch for having been heated to and mix and stir temperature and mixed and stirred；

Wherein, the preparation method for being combined warm mix regenerative agent is as follows：Surfactant is claimed according to a certain percentage with oil regenerative agent Take, then surfactant and oil regenerative agent are fitted into mixing apparatus mixed and stirred；

It is characterized in that：The compound warm mix regenerative agent is the composite of warm-mixing agent and regenerative agent；The surfactant adds Plus the calculation formula of quality is P_Surfactant=（P₁+P₂）× A, the calculation formula of the oil regenerative agent addition quality is P_{Oil regenerative agent}= P₂× B,

Wherein, P₁The quality of new pitch, g in-bituminous cements；

P₂The quality of aged asphalt, g in-bituminous cements；

The addition quality of A-surfactant accounts for the percentage of bituminous cements gross mass, %；

The addition quality of B-oil regenerative agent accounts for the percentage of aged asphalt quality in bituminous cements, %；

The addition quality of the surfactant is the 0.3-0.6% of bituminous cements gross mass, the addition of the oil regenerative agent Quality is the 6.0-12.0% of aged asphalt quality in bituminous cements.

3. the preparation method of warm mix regeneration asphalt as claimed in claim 2, it is characterised in that：The compound warm mix regenerative agent with The mixing time of pitch is 120-180s.

4. the preparation method of warm mix regeneration asphalt as claimed in claim 3, it is characterised in that：The compound warm mix regenerative agent with The mixing time of pitch is 150s.

5. the preparation method of warm mix regeneration asphalt as claimed in claim 2, it is characterised in that：The surfactant with it is described Oil regenerative agent forms composite after mixing and stirring, and the composite is compound warm mix regenerative agent.

6. the preparation method of warm mix regeneration asphalt as claimed in claim 2, it is characterised in that：The surfactant with it is described The temperature of mixing and stirring of oil regenerative agent is 40-60 DEG C.

7. the preparation method of warm mix regeneration asphalt as claimed in claim 2, it is characterised in that：The surfactant with it is described The mixing time of oil regenerative agent is 90-150s.