CN101845227B - Plain asphalt reclaiming agent and preparation method and application thereof - Google Patents

Abstract

The invention belongs to the field of asphalt-containing material composition and its preparation method and application, and specifically discloses a common asphalt regeneration agent and its preparation and application. The ordinary asphalt regenerant is mainly prepared by heating, mixing and stirring 23-35 parts of base asphalt, 60-75 parts of recycled oil, 3-5 parts of plasticizer and 0-5 parts of high-temperature stabilizer. The specific preparation method is as follows: first heat the base asphalt at 115°C to 135°C, then heat and stir the recycled oil, plasticizer and high temperature stabilizer at 115°C to 135°C to obtain a mixture; finally mix the base asphalt and The mixture is stirred at 115°C to 135°C, and after cooling, ordinary asphalt regenerant is obtained. When applying, take the aged asphalt and heat it at 110°C to 135°C, then add ordinary asphalt rejuvenator to it, the amount of which is more than 30% of the amount of aged asphalt, and then stir at 100°C to 110°C to obtain regenerated asphalt. The invention has the advantages of low cost, good regeneration effect and the like.

Description

Ordinary asphalt regenerant and its preparation method and application

technical field

The invention relates to a polymer compound composition and its preparation method and application, in particular to a bituminous material composition and its preparation method and application.

Background technique

With the development of our country's economy and society, our country's highway transportation has also developed rapidly. By the end of 2009, the total mileage of national roads opened to traffic reached 3,828,200 kilometers; among them, 75,000 kilometers were highways. With the continuous increase of road mileage, road grades are also continuously improved, a large number of low-grade roads have been rebuilt and expanded, and road traffic is playing an increasingly important role in national economic life.

The vast majority of high-grade highways in my country's highways are asphalt pavements. During the course of use, the asphalt pavement will gradually harden and age under the action of traffic load and natural factors. Compared with the original asphalt, the aging asphalt has lower penetration and ductility, resulting in cracks, looseness and other damage to the pavement. With the rapid development of highway transportation, a large number of roads have entered the period of major and medium repairs, and a large number of old roads need to be dug and milled, which not only causes great harm to the environment, but also in my country where asphalt resources are extremely scarce Under the circumstance, also caused the waste of a large amount of high-quality asphalt. Since our country has not yet fully mastered the recycling technology of old asphalt mixture, the waste of old asphalt will reach as much as 2.2 million tons. If it can be used, it can save more than 300 million yuan in material costs every year, and this figure is 15% per year. speed increases. According to this calculation, ten years later, the old asphalt mixture produced by major and medium repairs of asphalt pavement will exceed 10 million tons per year. If the old asphalt can be recycled by then, the material cost can be saved by 1.5 billion yuan per year.

On-site thermal regeneration technology of asphalt pavement is that the old asphalt pavement is heated, loosened and milled, and mixed with a certain proportion of new aggregate, new asphalt and regeneration agent, etc., and mixed by large-scale walking on-site "mixing equipment". Paved into a complete asphalt road. On-site thermal regeneration technology of asphalt pavement has obvious advantages such as economy, environmental protection, and energy saving, and many countries have adopted it as a basic policy. It can be foreseen that in the near future, the on-site thermal regeneration technology of asphalt pavement will also be applied on a large scale in our country. However, one of the keys to effective use of on-site thermal regeneration technology for asphalt pavement is the need for a large amount of high-quality, powerful asphalt regenerant. Therefore, how to formulate a kind of asphalt rejuvenator that can be effectively applied to the on-site thermal regeneration technology of asphalt pavement through a large number of experiments at the present stage has become a technical problem urgently to be solved by those skilled in the art.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, provide a common asphalt regenerant with low cost and good regeneration effect, and also provide a kind of raw material that is easy to obtain, requires low preparation equipment, simple preparation process, and low manufacturing cost. The preparation method of the ordinary asphalt rejuvenator also provides the application of an ordinary asphalt rejuvenator with simple operation, quick effect and long-lasting effect.

In order to solve the above technical problems, the technical solution proposed by the present invention is a common asphalt rejuvenator, which is mainly prepared by heating, mixing and stirring the following components in parts by mass:

Base bitumen 23～35 parts

Regenerated oil 60-75 parts

Plasticizer 3 to 5 parts and

High temperature stabilizer 0~5 parts.

Among the above-mentioned ordinary asphalt regenerants, the base asphalt is preferably 70# fresh asphalt.

In the above-mentioned ordinary asphalt regenerant, the regenerated oil is preferably a vacuum oil with high aromatic content and high flash point (for example, above 220° C.), and the aromatic content in the regenerated oil is 40% to 48% ( Preferably around 44.76%). The regenerated oil is generally a vacuum oil obtained after fractional distillation of crude oil through a vacuum device.

Among the above-mentioned ordinary asphalt regenerants, the plasticizer is preferably dibutyl phthalate.

Among the above-mentioned ordinary asphalt regenerants, the high-temperature stabilizer is preferably a straight-chain aliphatic hydrocarbon.

The raw material composition and formula of the above-mentioned common asphalt rejuvenator of the present invention are mainly based on the following principles: according to our observation, research and practice, the aging of asphalt is mainly because its components have changed, the aromatic components have decreased, colloids and asphaltene Therefore, the aging process of asphalt can be considered as the result of the translation of asphalt chemical components; the regeneration of waste asphalt is to blend rich aromatic components and soft components into waste asphalt in a certain proportion, so that new asphalt components can be established. And make the content matching more reasonable, so that the asphalt can be better dispersed in the aromatic and saturated components by means of colloids, forming a stable colloidal structure, thereby changing the rheological properties of asphalt, and making the asphalt performance meet the requirements of relevant quality indicators.

As a general technical idea, the present invention also provides a method for preparing the above-mentioned common asphalt rejuvenator, which includes the following steps: first, heating the base asphalt in parts by mass at a temperature of 115°C to 135°C for 2h to 3h , and stir evenly; then, heat the regenerated oil, plasticizer and high-temperature stabilizer in said parts by mass at a temperature of 115°C to 135°C for 1h to 2h, and stir evenly to obtain a mixture; finally, the heated base asphalt Stir the mixture with the mixture at 115° C. to 135° C. for 1 h to 2 h, and naturally cool to normal temperature to obtain a viscous liquid common asphalt rejuvenator.

As a general technical idea, the present invention also provides an application of the above-mentioned ordinary asphalt rejuvenator in the preparation of regenerated asphalt. The specific method of application is: take the aged asphalt and heat it at 110°C-135°C for 2h-3h, Then add the common asphalt rejuvenator to the heated aged asphalt, the added amount of the common asphalt regenerated agent is more than 30% of the aged asphalt, and then stir and mix evenly at a temperature of 100°C to 110°C to obtain the regenerated asphalt.

The important function of the above-mentioned ordinary asphalt rejuvenator of the present invention is to restore the serviceability of the aged asphalt in the hot-melt state. However, during the hot mix regeneration process in place, the effectiveness of the regenerant will be affected by the heating temperature. If the on-site heating temperature is too high, it will cause serious asphalt aging and reduce the efficacy; if the on-site heating temperature is too low, it will be difficult for the regenerant to fuse with the aged asphalt, and it will be difficult to play a regeneration role. There are many problems such as material segregation, compaction difficulty, and poor connection between layers. The ordinary asphalt rejuvenator of the present invention firstly has better high temperature resistance and stability, at the same time, the present invention controls the proper heating temperature of the ordinary asphalt rejuvenator in on-site thermal regeneration construction, all of which are well guaranteed In-situ thermal regeneration quality of asphalt concrete pavements.

Generally speaking, the ordinary asphalt rejuvenator of the present invention and its preparation method have the advantages of easy-to-obtain raw materials, low preparation equipment requirements, simple preparation process, and low manufacturing cost. The use of the ordinary asphalt rejuvenator of the present invention is also quite convenient. The regeneration effect on waste asphalt is obvious, and it can effectively and stably adapt to the high-temperature environment of on-site thermal regeneration heating, and has a quick effect and a long-lasting effect. The regenerated asphalt after deployment has three suitable index indexes and the required road performance.

In addition, the present invention utilizes the asphalt mixture by on-site heat regeneration, prevents the old asphalt concrete from polluting the disposal site and its surrounding environment, effectively protects the forest land, maintains the natural landscape and ecological environment, and has little traffic interference during maintenance, which is beneficial to Restoration of bearing capacity of asphalt pavement structure and prolonging service life of pavement.

Detailed ways

Example 1

A common asphalt rejuvenator of this embodiment, which is mainly prepared by heating, mixing and stirring the following components in parts by mass:

Esso 70# new asphalt 30 copies

Regenerated oil 65 parts

Dibutyl phthalate 4 parts and

High temperature stabilizer 1 part.

The above-mentioned regenerated oil is a vacuum oil obtained by fractionating crude oil through a vacuum device, wherein the aromatic content is 44.76%, and the high flash point is above 220° C.; the above-mentioned high-temperature stabilizer is sasobit. Sasobit is a new type of polyolefin high temperature stabilizer, its chemical composition is synthetic long-chain saturated hydrocarbons, and its dropping melting point is 115°C.

The preparation method of the common asphalt rejuvenator of the above-mentioned present embodiment comprises the following steps: firstly, heating 30 parts of Esso 70# fresh asphalt at 115° C. for 3 hours, and stirring evenly; then, mixing 65 parts of regenerated oil, Heat 4 parts of dibutyl phthalate and 1 part of high-temperature stabilizer at 115°C for 2 hours, and stir to obtain a mixture; finally, stir the heated base asphalt and the mixture at 115°C for 2 hours, and cool naturally At normal temperature, the viscous liquid ordinary asphalt rejuvenator can be obtained.

Example 2

A common asphalt rejuvenator of this embodiment, the common asphalt rejuvenator is mainly prepared by mixing, heating and stirring the following components in parts by mass:

Esso 70# new asphalt 23 copies

Regenerated oil 72 parts

Dibutyl phthalate 3 parts and

High temperature stabilizer 2 parts.

The above regenerated oil is a vacuum oil obtained by fractionating crude oil through a vacuum device, wherein the aromatic content is 44.76%, and the high flash point is above 220°C; the above high temperature stabilizer is Sasobit.

The preparation method of the common asphalt rejuvenator of the above-mentioned present embodiment comprises the following steps: firstly, heating 23 parts of Esso 70# fresh asphalt at 135° C. for 2 hours, and stirring evenly; then, mixing 72 parts of regenerated oil, Heat 3 parts of dibutyl phthalate and 2 parts of high-temperature stabilizer at 135°C for 1 hour, and stir evenly to obtain a mixture; finally, stir the heated base asphalt and the mixture at 135°C for 1 hour, and cool naturally At normal temperature, the viscous liquid ordinary asphalt rejuvenator can be obtained.

Example 3

A common asphalt rejuvenator of this embodiment, the common asphalt rejuvenator is mainly prepared by mixing, heating and stirring the following components in parts by mass:

Esso 70# new asphalt 35 copies

Regenerated oil 60 parts

Dibutyl phthalate 3 parts and

High temperature stabilizer 2 parts.

The above regenerated oil is a vacuum oil obtained by fractionating crude oil through a vacuum device, wherein the aromatic content is 44.76%, and the high flash point is above 220°C; the above high temperature stabilizer is Sasobit.

Except for the difference in the ratio of all raw materials, the preparation method of this example is exactly the same as that of Example 1.

Example 4

A common asphalt rejuvenator of this embodiment, the common asphalt rejuvenator is mainly prepared by mixing, heating and stirring the following components in parts by mass:

Esso 70# new asphalt 25 copies

Regenerated oil 70 parts

Dibutyl phthalate 5 parts and

High temperature stabilizer 0 parts.

The above regenerated oil is a vacuum oil obtained after fractional distillation of crude oil through a vacuum device, wherein the aromatic content is 44.76%, and the high flash point is above 220°C.

The preparation method of the common asphalt rejuvenator of the above-mentioned present embodiment includes the following steps: first, heat 25 parts of Esso 70# new asphalt at 120°C for 2.5 hours, and stir evenly; then, 70 parts of regenerated oil and 5 parts of dibutyl phthalate at 120°C for 1 hour, and stir to obtain a mixture; finally, stir the heated base asphalt and the mixture at 120°C for 2 hours, and naturally cool to room temperature to obtain a viscous Liquid ordinary asphalt rejuvenator.

Example 5

A common asphalt rejuvenator of this embodiment, the common asphalt rejuvenator is mainly prepared by mixing, heating and stirring the following components in parts by mass:

Esso 70# new asphalt 23 copies

Regenerated oil 67 parts

Dibutyl phthalate 5 parts and

High temperature stabilizer 5 parts.

The above regenerated oil is a vacuum oil obtained by fractionating crude oil through a vacuum device, wherein the aromatic content is 44.76%, and the high flash point is above 220°C; the above high temperature stabilizer is Sasobit.

The preparation method of the common asphalt rejuvenator of the above-mentioned present embodiment includes the following steps: first, heat 23 parts of Esso 70# new asphalt at a temperature of 115°C to 135°C for 2 hours, and stir evenly; then, 67 parts of Regenerated oil, 5 parts of dibutyl phthalate and 5 parts of high-temperature stabilizer are heated at 115°C to 135°C for 2 hours, and stirred evenly to obtain a mixture; finally, the heated base asphalt and the mixture are heated at 115°C to 135°C. Stir at 135°C for 2 hours, and cool naturally to room temperature to obtain a viscous liquid common asphalt rejuvenator.

Example 6

A certain amount of aged asphalt was taken to test the properties of aged asphalt. The test content included penetration, ductility and softening point, etc. The test results are shown in Table 1 below:

Table 1: Extracted Aged Bitumen Test Results

Pilot projects unit Aged Asphalt 1 Aged Asphalt 2 Aged Asphalt 3 Penetration (25℃, 100g, 5s) 0.1mm 7.2 9.3 6.8 Softening point (ring and ball method) ℃ 84.5 85.5 86.5 Viscosity (15℃, 5cm/min) cm 6.9 0.5 0.4

From the test results in Table 1 above, it can be seen that the penetration of aged asphalt is greatly reduced, while the softening point is greatly increased, both of which exceed the requirements of the "Technical Specifications for Construction of Highway Asphalt Pavement (JTG F40-2004), which shows that the aging The asphalt has become hard and brittle; in addition, the ductility of the aged asphalt has decreased significantly, which shows that the plasticity index of the aged asphalt has seriously decreased.

The ordinary asphalt rejuvenator configured in the above-mentioned embodiment 1 is selected, and the performance test results of the ordinary asphalt rejuvenator in embodiment 1 are shown in Table 2 below:

Table 2: Performance test results of the common asphalt regenerant of Example 1

From the test results in Table 2 above, it can be seen that the basic technical indicators of the regenerant meet the recommended value of the regenerant index in the "Technical Specifications for Recycling of Highway Asphalt Pavement" (JTG F41-2008), and it has good short-term aging resistance.

The common asphalt rejuvenator prepared in Example 1 is used to prepare regenerated asphalt, and the specific method of its application is: get a certain amount of aged asphalt (what this embodiment uses is the aged asphalt 1 in the above table 1) at 115 ° C Heat at ~135°C for 2.5 hours, then add ordinary asphalt rejuvenator to the heated aged asphalt, the amount of ordinary asphalt rejuvenator added is 4.08% to 30.6% of the amount of aged asphalt, and then stir and mix at 100°C to 110°C Evenly, to get recycled asphalt. The component test results of the regenerated asphalt prepared by using the common asphalt regenerated agent of Example 1 are shown in Table 3 below.

Table 3: Changes in common asphalt components after blending different proportions of regenerants (unit: %)

It can be seen from the above table 3 that with the increase of the addition amount of common asphalt regenerant in this example, the content of asphaltene and colloid in the finally prepared regenerated asphalt is gradually decreasing, and the content of saturated and aromatic components is gradually decreasing. This not only confirms the mechanism of action of the common asphalt regenerant of the present invention, but also verifies its technical effect on the regeneration of waste asphalt.

The performance test results of the above-mentioned regenerated asphalt prepared by using the common asphalt regenerated agent of Example 1 are shown in Table 4 below.

Table 4: Performance test results of the regenerated asphalt prepared in Example 6

From the test results in Table 4 above, it can be seen that with the increase in the amount of regenerated agent, the penetration of regenerated asphalt increases gradually, and the softening point gradually decreases, which shows that the brittle and hard aged asphalt has gradually softened; the increase in ductility also increases. It is very large, which shows that the plasticity of asphalt is obviously improved. When the addition amount of ordinary asphalt rejuvenating agent is more than 30%, the prepared regenerated asphalt can basically meet the requirements of industrial application.

The above performance test is based on the industry standard of the People's Republic of China "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTJ 052-2000).

In addition, the ordinary asphalt rejuvenator prepared in Examples 2-5 was selected to prepare regenerated asphalt, and its technical effect and performance parameters were similar to those of Example 6, both of which could achieve the technical effect described in the present invention and realize the regeneration of aged asphalt.

Claims (4)

1. a plain asphalt reclaiming agent is characterized in that, described plain asphalt reclaiming agent is mainly prepared after heating, mixing, stirring by the component of following mass fraction:

23～35 parts of matrix pitches

60～75 parts of recovered oils

3～5 parts of dibutyl phthalates and

0～5 part of high-temperature stabiliser;

Described recovered oil is that high fragrance divides the decompression oil plant of content, high flash point; It is 40%～48% that fragrance in the described recovered oil divides content, and described regeneration oil flash is more than 220 ℃; Described high-temperature stabiliser is the straight chain aliphatic hydrocarbon.

2. plain asphalt reclaiming agent according to claim 1 is characterized in that: described matrix pitch is the new pitch of 70#.

3. the preparation method of a plain asphalt reclaiming agent as claimed in claim 1 or 2 may further comprise the steps: at first, the matrix pitch of described mass fraction is heated 2h～3h under 115 ℃～135 ℃ temperature, and stir; Then, recovered oil, dibutyl phthalate and the high-temperature stabiliser of described mass fraction heated 1h～2h under 115 ℃～135 ℃ temperature, stir mixture; At last, matrix pitch and described mixture after the heating are stirred 1h～2h under 115 ℃～135 ℃ states, naturally cool to normal temperature and promptly obtain plain asphalt reclaiming agent.

4. the application of plain asphalt reclaiming agent as claimed in claim 1 or 2 in the preparation regeneration asphalt, it is characterized in that: get aged asphalt and under 110 ℃～135 ℃ temperature, heat 2h～3h, add described plain asphalt reclaiming agent in the aged asphalt after heating then, the addition of described plain asphalt reclaiming agent is more than 30% of aged asphalt consumption, under 100 ℃～110 ℃ temperature, mix then, obtain regeneration asphalt.