Bio-oil regenerated emulsified asphalt with synchronization of emulsification and modified regeneration and preparation method of bio-oil regenerated emulsified asphalt

Abstract

The invention relates to the technical field of road asphalt pavements, in particular to bio-oil regenerated emulsified asphalt with synchronous emulsification and modification regeneration and a preparation method thereof. The regenerated emulsified asphalt comprises the following components in percentage by mass: 30%-35% of new asphalt, 20%-25% of old asphalt, 34.2%-48.8% of water, 0.5%-2.0% of an emulsifier, 0.2%-0.4% of a co-emulsifier, 0.1%-0.4% of acid and 1%-3% of bio-oil. According to the invention, a regeneration process and an emulsified asphalt process are combined to prepare the bio-oil regenerated emulsified asphalt with synchronous emulsification and modification regeneration. The bio-oil regenerated emulsified asphalt with synchronous emulsification and modification regeneration has the characteristics of simple component composition and preparation process, can reduce the aging risk of asphalt, has the basic performance of emulsified asphalt, and conforms to the current strategy of solid waste resource utilization and environmental protection.

Description

Technical Field

[0001] The invention relates to the technical field of highway asphalt pavement, and in particular to a bio-oil regenerated emulsified asphalt with synchronous emulsification and modified regeneration and a preparation method thereof. Background Art

[0002] 90% of China's high-grade highways and urban roads are asphalt pavement, which has the advantages of comfortable driving, low noise, short construction period and simple maintenance. When the pavement reaches its service life ahead of schedule or normally, the maintenance unit will mill the asphalt pavement, which will produce a large amount of recycled asphalt pavement material (RAP). In newly built asphalt pavement, asphalt binder accounts for about 5% of the mixture, but it accounts for more than 60% of the total cost, and there is still about 5% asphalt binder in RAP.

[0003] During the service period, the asphalt binder in RAP will produce different aging effects such as polymerization, oxidation and volatilization under the coupling of temperature, oxygen, water, sunlight and other conditions, resulting in the inability to directly recycle and reuse the asphalt binder in RAP. In the context of global resource shortage, in-depth research has been conducted on the regeneration of asphalt binder in RAP. In view of the imbalance between asphaltene and light components caused by asphalt aging, researchers have proposed a solution to supplement light components to achieve "colloid balance" and then restore the performance of asphalt. There are many studies on the use of bio-oil as an asphalt regeneration agent in this solution. Bio-oil is mainly composed of light asphalt and has the characteristics of complete source, low cost, green, pollution-free and renewable. In recent years, waste bio-oil asphalt regeneration agents have also been studied and good results have been obtained. The joint reuse of old asphalt binder and waste bio-oil optimizes the resource structure of road engineering and further improves the level of solid waste resource utilization in its field.

[0004] However, the current traditional recycling scheme is to use hot melt mixing of new asphalt, old asphalt and bio-oil to achieve uniform mixing, and in order to achieve uniform mixing, long-term high-temperature shear mixing is required. Under this condition, new asphalt will age and old asphalt will age again, and the molecular conformation (difficult to recover) of both will occur or be further destroyed, and there is a game between uniformity and adverse effects. At the same time, the recycled asphalt can only be used in subsequent applications through hot mixing. The hot mixing process still consumes energy resources and generates carbon emissions, and the transportation, storage and mixing steps in the hot mixing will still cause asphalt aging, which is not conducive to the use of recycled asphalt.

[0005] The use of emulsified asphalt in pavement construction is a relatively environmentally friendly construction process that can avoid asphalt aging during construction. However, there are currently more studies on cold-regenerated RAP mixtures using emulsified asphalt, and less on recycled emulsified asphalt. In view of this, there is an urgent need for a recycled emulsified asphalt that can be emulsified and modified for simultaneous regeneration, which can achieve performance regeneration and resource reuse while ensuring the uniform mixing of new and old asphalt to the greatest extent and reducing the risk of re-aging of recycled asphalt, and subsequent applications can also be low-carbon construction. Summary of the invention

[0006] In view of the above problems, the present invention provides a bio-oil regenerated emulsified asphalt with simultaneous emulsification and modified regeneration and a preparation method thereof.

[0007] The technical solution adopted by the present invention is:

[0008] The invention provides a bio-oil regenerated emulsified asphalt with synchronous emulsification and modified regeneration, which comprises the following raw material components by mass percentage: 30% to 35% new asphalt, 20% to 25% old asphalt, 34.2% to 48.8% water, 0.5% to 2.0% emulsifier, 0.2% to 0.4% co-emulsifier, 0.1% to 0.4% acid and 1% to 3% bio-oil.

[0009] In the above technical scheme, further, the new asphalt is selected from one of No. 70 base asphalt, No. 90 base asphalt and No. 110 base asphalt; the old asphalt is extracted from the RAP material of No. 70 base asphalt, No. 90 base asphalt or No. 110 base asphalt; or the old asphalt is one of No. 70 base asphalt, No. 90 base asphalt and No. 110 base asphalt that has been stored and has signs of aging; the emulsifier is a slow-cracking and fast-setting cationic asphalt emulsifier, which does not have the ability to emulsify bio-oil; the co-emulsifier is anhydrous calcium chloride, silicon dioxide or polyvinyl alcohol.

[0010] In the above technical scheme, further, the bio-oil is selected from one or more of soybean oil, peanut oil, sunflower oil, palm oil, mustard oil or rapeseed oil; or the bio-oil is waste bio-oil generated after cooking, including one or more of waste soybean oil, waste peanut oil, waste sunflower oil, waste palm oil, waste mustard oil or waste rapeseed oil; the waste bio-oil is filtered with a 100-mesh filter before use; the mass of the bio-oil is 5% to 12% of that of the old asphalt.

[0011] In the above technical solution, further, the water is pure water with a pH value of 6.5 to 7.5 and a density of about 0.98 g / m 3 ~1.02g / m 3 .

[0012] In the above technical solution, further, the solid content of the regenerated emulsified asphalt is 50% to 65%.

[0013] In the above technical solution, further, the regenerated emulsified asphalt is prepared by the following method:

[0014] 1) Preparation of mixed asphalt: Place new asphalt and old asphalt in a high temperature environment of 140℃~160℃ and heat them to a molten state respectively; Divide the new asphalt into two parts by mass, one part of which is mixed with the old asphalt to adjust the components of the old asphalt and reduce the viscosity of the old asphalt for grinding, and keep stirring at a high temperature of 140℃~160℃ for 1min~3min until the two are roughly mixed to form a mixed asphalt; Place the other part of the new asphalt and the mixed asphalt in the original high temperature environment of 140℃~160℃ for standby use;

[0015] 2) preparing soap solution: after the purified water is heated to 60° C. to 70° C., an emulsifier, water and an emulsifier are added in sequence and stirred evenly, then the bio-oil is added and stirred, and then the pH value of the soap solution is adjusted to 2 to 3 with an acid to obtain a soap solution;

[0016] 3) Preparation of colloid mill: Before preparing emulsified asphalt for the first time, the colloid mill needs to be preheated for 8 to 15 minutes, and some emulsified asphalt can be prepared at will, emptied and discarded, and the mechanical properties of the colloid mill are stimulated to prepare the colloid mill;

[0017] 4) Preparation of bio-oil regenerated emulsified asphalt for simultaneous emulsification and modification and regeneration: First, pour the freshly prepared soap solution into the colloid mill while adjusting the colloid mill speed from 0 r / min to 2000 r / min-3000 r / min until a stable water column is formed; secondly, slowly add a portion of the new asphalt to be used in step (2) into the colloid mill for shearing to provide an emulsified asphalt environment for the mixed asphalt, and at this time adjust the colloid mill speed to 2500 r / min-3500 r / min; finally, slowly add the mixed asphalt to be used in step (2) into the colloid mill for shearing, and at this time adjust the colloid mill speed to 3000 r / min-4500 r / min. After complete addition, shear for 5 min-15 min to ensure that the old asphalt is well sheared, thereby obtaining bio-oil regenerated emulsified asphalt for simultaneous emulsification and modification and regeneration.

[0018] In the above technical solution, further, in the step (1), the new asphalt is divided into two parts by mass, and the mass ratio of the two parts is 1:(1-3).

[0019] In the above technical solution, further, the acid is hydrochloric acid, which is used to control the pH of the soap solution within 2-3, has a molecular weight of 36.46, a melting point of -27.32°C (38% solution), and a boiling point of 48°C (38% solution).

[0020] In the above technical solution, further, the larger portion is mixed with old asphalt, and the smaller portion is placed in an environment of 140°C to 160°C for standby use.

[0021] In the above technical solution, further, in the step (1), the stirring is manual stirring or mechanical stirring, and the mechanical stirring speed is 500 to 2000 r / min.

[0022] Compared with the prior art, the bio-oil regenerated emulsified asphalt with simultaneous emulsification and modified regeneration and the preparation method thereof described in the present invention have the following advantages:

[0023] 1. The present invention overcomes the problem that the traditional preparation of recycled asphalt requires long-term high-temperature stirring and mixing, which causes additional aging of asphalt. For the first time, the regeneration process and the emulsified asphalt process are combined, and there is no need for long-term high-temperature stirring. It only needs to be manually stirred and mixed for 1 minute to 3 minutes. Then, based on the emulsified asphalt process, the new asphalt and the old asphalt are ground by a colloid mill and emulsified with soap solution. After emulsification, the asphalt forms nano-scale asphalt particles, and can achieve uniform mixing of the new asphalt, the old asphalt and the (waste) bio-oil based on an aqueous solution environment, avoiding additional aging caused by the uniform mixing of the new asphalt, the old asphalt and the (waste) bio-oil. The stability of the generated bio-oil regenerated emulsified asphalt meets the technical specifications of emulsified asphalt, and the asphalt residue after evaporation has better recycled asphalt characteristics.

[0024] 2. The present invention reuses both old asphalt and waste bio-oil, and has the characteristics of solid waste resource utilization and environmental protection. At the same time, through the asphalt regeneration process of simultaneous emulsification and regeneration, the risk of secondary aging of old asphalt is reduced, and the asphalt and bio-oil are prevented from stimulating harmful asphalt smoke and other toxic gases at high temperatures, which has a certain environmental protection effect. The process can also achieve a certain energy-saving and emission reduction effect in subsequent engineering applications. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0026] The technical solutions in the embodiments of the present invention are described clearly and completely below in combination with the embodiments of the present invention. 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 creative work are within the protection scope of the present invention.

[0027] The pH value of the purified water used in the following examples is between 6.5 and 7.5, and the density is about 1 g / m 3 The molecular weight of the hydrochloric acid used is 36.46, the melting point is -27.32°C (38% solution), and the boiling point is 48°C (38% solution).

[0028] Example 1

[0029] A bio-oil regenerated emulsified asphalt with synchronous emulsification and modified regeneration comprises the following components by mass percentage: 30% of No. 70 base asphalt, 25% of No. 70 base asphalt extracted by RAP, 41.65% of pure water, 1% of slow-cracking and fast-setting cationic asphalt emulsifier, 0.2% of anhydrous calcium chloride, 0.15% of hydrochloric acid and 2% of soybean oil.

[0030] The above-mentioned bio-oil regenerated emulsified asphalt with simultaneous emulsification and modified regeneration is prepared by the following method:

[0031] 1) Preparation of mixed asphalt: Heat No. 70 base asphalt and No. 70 base asphalt extracted by RAP in a high temperature environment of 140°C until they are molten. Divide the new asphalt into two equal parts by mass. Mix half of the new asphalt with the old asphalt to adjust the components of the old asphalt and reduce the viscosity of the old asphalt for grinding. Stir manually for 2 minutes at 140°C until the two are roughly mixed to form a mixed asphalt. Place the other half of the asphalt and the mixed asphalt in the original high temperature environment and wait for use;

[0032] 2) Prepare soap solution: After the purified water is heated to 60°C to 70°C, anhydrous calcium chloride, purified water and slow-cracking and fast-setting cationic asphalt emulsifier are added in sequence and stirred evenly, then soybean oil is added and stirred, and finally hydrochloric acid is added to obtain soap solution with a pH value of 2.2;

[0033] 3) Preparation of colloid mill: Before preparing emulsified asphalt for the first time, the colloid mill needs to be preheated for 10 minutes, and some emulsified asphalt can be prepared at will, the emulsified asphalt is emptied and discarded, and the mechanical properties of the colloid mill are stimulated to prepare the colloid mill;

[0034] 4) Preparation of bio-oil regenerated emulsified asphalt with simultaneous emulsification and modification regeneration: First, pour the freshly prepared soap solution into the colloid mill while adjusting the colloid mill speed from 0 r / min to 2500 r / min until a stable water column is formed; secondly, slowly add the other half of the new asphalt into the colloid mill for shearing to provide an emulsified asphalt environment for the mixed asphalt. At this time, adjust the colloid mill speed to 3000 r / min; finally, slowly add the mixed asphalt into the colloid mill for shearing. At this time, adjust the colloid mill speed to 3700 r / min. After complete addition, shear for 10 minutes to ensure that the old asphalt is well sheared, so as to obtain bio-oil regenerated emulsified asphalt with simultaneous emulsification and modification regeneration.

[0035] Comparative Example 1

[0036] The difference from Example 1 is that the ratio of new asphalt to old asphalt is different. Specifically, the bio-oil regenerated emulsified asphalt with simultaneous emulsification and modified regeneration includes the following components by mass percentage: 30% of No. 70 base asphalt, 21% of No. 70 base asphalt extracted by RAP, 45.65% of pure water, 1% of slow-cracking and fast-setting cationic asphalt emulsifier, 0.2% of anhydrous calcium chloride, 0.15% of hydrochloric acid and 2.0% of soybean oil. The preparation method is the same as that of Example 1.

[0037] Example 2

[0038] A bio-oil regenerated emulsified asphalt with simultaneous emulsification and modified regeneration comprises the following components by mass percentage: 32% of No. 70 base asphalt, 25% of aged No. 70 base asphalt, 39.10% of pure water, 1.5% of slow-cracking and fast-setting cationic asphalt emulsifier, 0.2% of polyvinyl alcohol, 0.2% of hydrochloric acid and 2.0% of peanut oil.

[0039] The above-mentioned bio-oil regenerated emulsified asphalt with simultaneous emulsification and modified regeneration is prepared by the following method:

[0040] 1) Preparation of mixed asphalt: Heat the No. 70 base asphalt and the aged No. 70 base asphalt in a high temperature environment of 140°C until they are molten. Divide the new asphalt into two parts by mass, mix half of the new asphalt with the old asphalt to adjust the old asphalt components and reduce the viscosity of the old asphalt for grinding, and stir mechanically at 1000r / min for 1.5min at 140°C until the two are roughly mixed to form a mixed asphalt. Place the other half of the asphalt and the mixed asphalt in the original high temperature environment and wait for use;

[0041] 2) Prepare soap solution: After the purified water is heated to 60°C to 70°C, polyvinyl alcohol, purified water and slow-cracking and fast-setting cationic asphalt emulsifier are added in sequence and stirred evenly, then peanut oil is added and stirred, and finally hydrochloric acid is added to obtain soap solution with a pH value of 2.4;

[0042] 3) Preparation of colloid mill: Before preparing emulsified asphalt for the first time, the colloid mill needs to be preheated for 10 minutes, and some emulsified asphalt can be prepared at will, the emulsified asphalt is emptied and discarded, and the mechanical properties of the colloid mill are stimulated to prepare the colloid mill;

[0043] 4) Preparation of bio-oil regenerated emulsified asphalt with simultaneous emulsification and modification regeneration: First, pour the freshly prepared soap solution into the colloid mill while adjusting the colloid mill speed from 0 r / min to 2600 r / min until a stable water column is formed; secondly, slowly add the other half of the new asphalt into the colloid mill for shearing to provide an emulsified asphalt environment for the mixed asphalt in advance, and at this time adjust the colloid mill speed to 3000 r / min; finally, slowly add the mixed asphalt into the colloid mill for shearing, and at this time adjust the colloid mill speed to 3600 r / min. After complete addition, shear for 10 minutes to ensure that the old asphalt is well sheared, so as to obtain bio-oil regenerated emulsified asphalt with simultaneous emulsification and modification regeneration.

[0044] Example 3

[0045] A bio-oil regenerated emulsified asphalt with synchronous emulsification and modified regeneration comprises the following components by mass percentage: 30% of No. 90 base asphalt, 25% of No. 90 base asphalt extracted by RAP, 40.05% of pure water, 2.0% of slow-cracking and fast-setting cationic asphalt emulsifier, 0.25% of anhydrous calcium chloride, 0.3% of hydrochloric acid and 2.4% of rapeseed oil.

[0046] The above-mentioned bio-oil regenerated emulsified asphalt with simultaneous emulsification and modified regeneration is prepared by the following method:

[0047] 1) Preparation of mixed asphalt: Heat No. 90 base asphalt and No. 90 base asphalt extracted by RAP in a high temperature environment of 140°C until they are molten. Divide the new asphalt into two parts by mass, and mix half of the new asphalt with the old asphalt to adjust the components of the old asphalt and reduce the viscosity of the old asphalt for grinding. Stir manually for 2 minutes at 140°C until the two are roughly mixed to form a mixed asphalt. Place the other half of the asphalt and the mixed asphalt in the original high temperature environment and wait for use;

[0048] 2) Prepare soap solution: After the purified water is heated to 60°C to 70°C, anhydrous calcium chloride, purified water and slow-cracking and fast-setting cationic asphalt emulsifier are added in sequence and stirred evenly, rapeseed oil is added and stirred, and finally hydrochloric acid is added to obtain soap solution with a pH value of 2.1;

[0049] 3) Preparation of colloid mill: Before preparing emulsified asphalt for the first time, the colloid mill needs to be preheated for 10 minutes, and some emulsified asphalt can be prepared at will, the emulsified asphalt is emptied and discarded, and the mechanical properties of the colloid mill are stimulated to prepare the colloid mill;

[0050] 4) Preparation of bio-oil regenerated emulsified asphalt with simultaneous emulsification and modification: First, pour the freshly prepared soap solution into the colloid mill while adjusting the colloid mill speed from 0 r / min to 2400 r / min until a stable water column is formed; secondly, slowly add the other half of the new asphalt into the colloid mill for shearing to provide an emulsified asphalt environment for the mixed asphalt. At this time, adjust the colloid mill speed to 3200 r / min; finally, slowly add the mixed asphalt into the colloid mill for shearing. At this time, adjust the colloid mill speed to 3800 r / min. After complete addition, shear for 8 minutes to ensure that the old asphalt is well sheared, so as to obtain bio-oil regenerated emulsified asphalt with simultaneous emulsification and modification.

[0051] Comparative Example 3

[0052] The difference from Example 3 is that the ratio of new asphalt to old asphalt is different. Specifically, the bio-oil regenerated emulsified asphalt with simultaneous emulsification and modified regeneration includes the following components by mass percentage: 33% of No. 90 base asphalt, 25% of No. 90 base asphalt extracted by RAP, 37.05% of pure water, 2.0% of slow-cracking and fast-setting cationic asphalt emulsifier, 0.25% of anhydrous calcium chloride, 0.3% of hydrochloric acid and 2.4% of rapeseed oil. The preparation method is the same as that of Example 3.

[0053] Example 4

[0054] A bio-oil regenerated emulsified asphalt with simultaneous emulsification and modification regeneration comprises the following components by mass percentage: 35% of No. 90 base asphalt, 20% of aged No. 90 base asphalt, 41.1% of pure water, 1.6% of slow-cracking and fast-setting cationic asphalt emulsifier, 0.25% of polyvinyl alcohol, 0.25% of hydrochloric acid and 1.8% of waste soybean oil. The waste soybean oil is soybean oil after cooking.

[0055] The above-mentioned bio-oil regenerated emulsified asphalt with simultaneous emulsification and modified regeneration is prepared by the following method:

[0056] 1) Preparation of mixed asphalt: Heat the No. 90 base asphalt and the aged No. 90 base asphalt in a high temperature environment of 140°C until they are molten. Divide the new asphalt into two parts by mass, mix half of the new asphalt with the old asphalt to adjust the old asphalt components and reduce the viscosity of the old asphalt for grinding, and stir manually at 140°C for 2 minutes until the two are roughly mixed to form a mixed asphalt. Place the other half of the asphalt and the mixed asphalt in the original high temperature environment and wait for use;

[0057] 2) Preparation of soap solution: After the purified water is heated to 60°C to 70°C, polyvinyl alcohol, purified water and slow-cracking and fast-setting cationic asphalt emulsifier are added in sequence and stirred evenly, then waste soybean oil is added and stirred, and finally hydrochloric acid is added to obtain soap solution with a pH value of 2.4;

[0058] 3) Preparation of colloid mill: Before preparing emulsified asphalt for the first time, the colloid mill needs to be preheated for 10 minutes, and some emulsified asphalt can be prepared at will, the emulsified asphalt is emptied and discarded, and the mechanical properties of the colloid mill are stimulated to prepare the colloid mill;

[0059] 4) Preparation of bio-oil regenerated emulsified asphalt with simultaneous emulsification and modification regeneration: First, pour the freshly prepared soap solution into the colloid mill while adjusting the colloid mill speed from 0 r / min to 2700 r / min until a stable water column is formed; secondly, slowly add the other half of the new asphalt into the colloid mill for shearing to provide an emulsified asphalt environment for the mixed asphalt. At this time, adjust the colloid mill speed to 3000 r / min; finally, slowly add the mixed asphalt into the colloid mill for shearing. At this time, adjust the colloid mill speed to 3800 r / min. After complete addition, shear for 8 minutes to ensure that the old asphalt is well sheared, so as to obtain bio-oil regenerated emulsified asphalt with simultaneous emulsification and modification regeneration.

[0060] Example 5

[0061] A bio-oil regenerated emulsified asphalt with synchronous emulsification and modified regeneration comprises the following components by mass percentage: 30% of No. 110 base asphalt, 25% of No. 110 base asphalt extracted by RAP, 40.65% of pure water, 1.5% of slow-cracking and fast-setting cationic asphalt emulsifier, 0.2% of silicon dioxide, 0.15% of hydrochloric acid and 2.5% of rapeseed oil.

[0062] The above-mentioned bio-oil regenerated emulsified asphalt with simultaneous emulsification and modified regeneration is prepared by the following method:

[0063] 1) Preparation of mixed asphalt: Heat No. 110 base asphalt and RAP extracted No. 110 base asphalt in a high temperature environment of 130°C until they are molten. Divide the new asphalt into two parts by mass, mix half of the new asphalt with the old asphalt to adjust the old asphalt components and reduce the viscosity of the old asphalt for grinding, and stir manually for 2 minutes at 145°C until the two are roughly mixed to form mixed asphalt. Place the other half of the asphalt and the mixed asphalt in the original high temperature environment and wait for use;

[0064] 2) preparing soap solution: after the purified water is heated to 60°C to 70°C, silicon dioxide, purified water and slow-cracking and fast-setting cationic asphalt emulsifier are added in sequence and stirred evenly, rapeseed oil is added and stirred, and finally hydrochloric acid is added to obtain soap solution with a pH value of 2.3;

[0065] 3) Preparation of colloid mill: Before preparing emulsified asphalt for the first time, the colloid mill needs to be preheated for 10 minutes, and some emulsified asphalt can be prepared at will, the emulsified asphalt is emptied and discarded, and the mechanical properties of the colloid mill are stimulated to prepare the colloid mill;

[0066] 4) Preparation of bio-oil regenerated emulsified asphalt with simultaneous emulsification and modification regeneration: First, pour the freshly prepared soap solution into the colloid mill while adjusting the colloid mill speed from 0 r / min to 2500 r / min until a stable water column is formed; secondly, slowly add the other half of the new asphalt into the colloid mill for shearing to provide an emulsified asphalt environment for the mixed asphalt in advance, and at this time adjust the colloid mill speed to 3000 r / min; finally, slowly add the mixed asphalt into the colloid mill for shearing, and at this time adjust the colloid mill speed to 3600 r / min. After complete addition, shear for 5 minutes to ensure that the old asphalt is well sheared, so as to obtain bio-oil regenerated emulsified asphalt with simultaneous emulsification and modification regeneration.

[0067] Comparative Example 5

[0068] The difference from Example 5 is that the ratio of new asphalt to old asphalt is different. Specifically, the bio-oil regenerated emulsified asphalt with simultaneous emulsification and modified regeneration includes the following components by mass percentage: 25% of No. 110 base asphalt, 30% of No. 110 base asphalt extracted by RAP, 40.65% of pure water, 1.5% of slow-cracking and fast-setting cationic asphalt emulsifier, 0.2% of silicon dioxide, 0.15% of hydrochloric acid and 2.5% of rapeseed oil. The preparation method is the same as that of Example 5.

[0069] The penetration, ductility, softening point, low-temperature rheology and high-temperature rheology of the evaporation residues of the new asphalt, old asphalt and the emulsified and modified regenerated bio-oil emulsified asphalt involved in the above embodiments and comparative examples are respectively based on T0604-2011, T0605-2011, T0606-2011, T0627-2011 and T0628-2011 in JTG E20-2011, and the PG classification is based on AASHTO M320-03 in the U.S. Strategic Highway Research (SHRP) program; the storage stability of the emulsified asphalt regenerated bio-oil emulsified asphalt with simultaneous emulsification and modified regeneration is based on T0655-1993 in JTG E20-2011. In order to compare the regeneration effect and avoid the aging effect caused by long-term high-temperature evaporation, 800g of bio-oil regenerated emulsified asphalt was poured into a 0.5m×0.5m×0.05m metal container for outdoor evaporation at room temperature (30°C to 36°C), and finally the evaporation residue in this way was taken out by a scraper (the needle penetration, elongation and softening point of the evaporation residue were not referred to the specification requirements). The technical properties of the new asphalt and the old asphalt of each embodiment of the evaporation residue are shown in Table 1, and the technical properties of the bio-oil regenerated emulsified asphalt with synchronous emulsification and modified regeneration of each embodiment are shown in Table 2.

[0070] Table 1 Technical properties of new asphalt and old asphalt

[0071]

[0072] Table 2 Technical performance of bio-oil regenerated emulsified asphalt with simultaneous emulsification and modified regeneration

[0073]

[0074]

[0075] The process of the present invention can prepare regenerated emulsified asphalt with simultaneous emulsification and modification regeneration, and there is no need to perform long-term high-temperature shear mixing in order to fully and evenly mix new asphalt, old asphalt and bio-oil, thereby reducing the risk of new asphalt aging and secondary aging of old asphalt during high-temperature shearing. Only the same time and temperature conditions as those for producing conventional emulsified asphalt are required to fully and evenly mix new asphalt, old asphalt and bio-oil based on aqueous solution, and the initial stirring only requires 1 to 3 minutes, which can be achieved by manual stirring. The prepared regenerated emulsified asphalt with simultaneous emulsification and modification regeneration can recycle old asphalt and waste bio-oil to achieve resource reuse, and can also further reduce construction carbon emissions based on the technical characteristics of emulsified asphalt.

[0076] It can be seen from the results of various embodiments and comparative examples in Tables 1 and 2 that after emulsification regeneration, a bio-oil regenerated emulsified asphalt with solid content and stability technical performance that meets the requirements of the specification can be prepared. The results of the room temperature evaporation residue of the emulsified asphalt of each embodiment also show that the physical properties can be restored through the synchronous technology of emulsification and modified regeneration, and the PG classification is also restored accordingly. The evaporation residue evaporated at room temperature has better regeneration characteristics. At the same time, according to the results of Example 1 and Comparative Example 1, Example 3 and Comparative Example 3, and Example 5 and Comparative Example 5, within the specified ratio, a lower content of old asphalt can make the stability of the bio-oil regenerated emulsified asphalt better, and when the new and old ratios exceed the corresponding ratios, the bio-oil regenerated emulsified asphalt cannot meet the requirements of emulsified asphalt for stability.

[0077] The above embodiments are merely examples for clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above descriptions. It is not necessary and impossible to list all the implementation methods here, and the obvious changes or modifications derived therefrom are still within the protection scope of the invention.

Claims

1. A bio-oil regenerated emulsified asphalt with simultaneous emulsification and modification regeneration, characterized in that: Calculated by mass percentage, it includes the following raw material components: 30% to 35% new asphalt, 20% to 25% old asphalt, 34.2% to 48.8% water, 0.5% to 2.0% emulsifier, 0.2% to 0.4% co-emulsifier, 0.1% to 0.4% acid, and 1% to 3% bio-oil.

2. The bio-oil regenerated emulsified asphalt with simultaneous emulsification and modification regeneration according to claim 1, characterized in that: The new asphalt is selected from one of No. 70 base asphalt, No. 90 base asphalt and No. 110 base asphalt; the old asphalt is extracted from the RAP material of No. 70 base asphalt, No. 90 base asphalt or No. 110 base asphalt; Or the old asphalt is one of No. 70 base asphalt, No. 90 base asphalt, and No. 110 base asphalt that has been stored and has signs of aging; the emulsifier is a slow-cracking, fast-setting cationic asphalt emulsifier; the auxiliary emulsifier is anhydrous calcium chloride, silicon dioxide, or polyvinyl alcohol.

3. The bio-oil regenerated emulsified asphalt with simultaneous emulsification and modified regeneration according to claim 1, characterized in that: The bio-oil is selected from one or more of soybean oil, peanut oil, sunflower oil, palm oil, mustard oil or rapeseed oil; or the bio-oil is waste bio-oil generated after cooking, including one or more of waste soybean oil, waste peanut oil, waste sunflower oil, waste palm oil, waste mustard oil or waste rapeseed oil; the waste bio-oil is filtered with a 100-mesh filter before use; the mass of the bio-oil is 5% to 12% of that of old asphalt.

4. The bio-oil regenerated emulsified asphalt with simultaneous emulsification and modification regeneration according to claim 1, characterized in that: The water is pure water with a pH value of 6.5 to 7.5 and a density of about 0.98 g / m 3 ~1.02g / m 3 ; The acid is hydrochloric acid.

5. The bio-oil regenerated emulsified asphalt with simultaneous emulsification and modification regeneration according to claim 1, characterized in that: The solid content of the regenerated emulsified asphalt is 50% to 65%.

6. The bio-oil regenerated emulsified asphalt with simultaneous emulsification and modification regeneration according to claim 1, characterized in that: Prepared by the following method: 1) Preparation of mixed asphalt: Place new asphalt and old asphalt in an environment of 140℃~160℃ and heat them to a molten state respectively; Divide the new asphalt into two parts by mass, one part of which is mixed with the old asphalt and stirred at 140℃~160℃ for 1min~3min to generate mixed asphalt; Place the other part of the new asphalt and the mixed asphalt in an environment of 140℃~160℃ for standby use; 2) preparing soap solution: after the purified water is heated to 60° C. to 70° C., an emulsifier, water and an emulsifier are added in sequence and stirred evenly, then the bio-oil is added and stirred, and then the pH value of the soap solution is adjusted to 2 to 3 with an acid to obtain a soap solution; 3) Colloid mill equipment preparation: preheat the colloid mill for 8 to 15 minutes, prepare the emulsified asphalt, empty the emulsified asphalt and discard it; 4) Preparation of bio-oil regenerated emulsified asphalt with simultaneous emulsification and modified regeneration: First, pour the freshly prepared soap solution into the colloid mill while adjusting the colloid mill speed from 0 r / min to 2000 r / min to 3000 r / min until a stable water column is formed; Secondly, slowly add a portion of the new asphalt to be used in step (2) into the colloid mill for shearing, and adjust the speed of the colloid mill to 2500r / min~3500r / min; finally, slowly add the mixed asphalt to be used in step (2) into the colloid mill for shearing, and adjust the speed of the colloid mill to 3000r / min~4500r / min. After complete addition, shear for 5min~15min to obtain bio-oil regenerated emulsified asphalt with synchronous emulsification and modified regeneration.

7. The bio-oil regenerated emulsified asphalt with simultaneous emulsification and modified regeneration according to claim 6, characterized in that: In the step (1), the new asphalt is divided into two parts by mass, and the mass ratio of the two parts is 1:(1-3).

8. The bio-oil regenerated emulsified asphalt with simultaneous emulsification and modification regeneration according to claim 7, characterized in that: The larger portion is mixed with old asphalt, and the smaller portion is placed in an environment of 140℃ ~ 160℃ for later use.

9. The bio-oil regenerated emulsified asphalt with simultaneous emulsification and modification regeneration according to claim 7, characterized in that: The stirring in step (1) is manual stirring or mechanical stirring, and the mechanical stirring speed is 500 to 2000 r / min.

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