CN107022198B - A kind of bionic self-healing asphalt and preparation method thereof - Google Patents

Abstract

The invention provides a bionic self-healing asphalt and a preparation method thereof. The bionic self-healing asphalt includes base asphalt and a bionic self-healing asphalt modifier; wherein, the bionic self-healing asphalt modifier includes a self-healing component. In the present invention, the self-healing component is an expansile and self-proliferating and crystallized material at normal temperature, which is combined with the common matrix asphalt in the field to imitate the healing mechanism of the human body, so that the obtained bionic self-healing asphalt does not affect the use of asphalt roads. Under the premise of performance, the road has the same self-healing function as the human body. The bionic self-healing asphalt of the present invention has the functions of swelling and self-added value-added crystallization, and the preparation method is simple, and the production cost is low. The prepared bionic self-healing asphalt not only has the effect of self-healing cracks and effectively reducing cracking, but also does not affect the asphalt. other performance.

Description

A kind of bionic self-healing asphalt and preparation method thereof

technical field

The invention relates to the technical field of road and building material modification, and more specifically relates to a bionic self-healing asphalt and a preparation method thereof.

Background technique

The construction of transportation infrastructure is the cornerstone of national development. As of 2016, the total mileage of my country's highways has reached 4.57 million kilometers, and urban roads account for 1/3 of the total urban area. Nearly 200,000 kilometers of roads need to be restored and reconstructed every year. The frequent occurrence of road diseases leads to huge investment in road maintenance, and at the same time has a major impact on traffic safety and people's travel. The problem of road maintenance has attracted widespread attention at home and abroad. In some areas with heavy traffic pressure, it is of great significance to build durable and long-life roads.

According to research, road cracks are not only the main component of the disease, but also the main cause of other diseases. This project conducted a fixed-point survey on the roads in the Beijing-Tianjin-Hebei region, and the results showed that the crack area accounted for more than 50% of the total disease area. To deal with road cracks, the currently commonly used method is to fill the cracks after the cracks occur. This method has a strong hysteresis, is time-consuming and labor-intensive, has a large carbon emission, pollutes the environment, and treats the symptoms but not the root cause. Therefore, reducing the occurrence of cracks is the only cure Effective approach to road damage.

At present, most of the maintenance methods used in my country's road engineering are manual repairs, that is, when there are cracks, potholes and other diseases on the road surface, workers will work manually. According to the maintenance rules, use hot asphalt or emulsified asphalt to fill the joints with a width of less than 10mm; use fine-grained hot-mix asphalt mixture or emulsified asphalt mixture to fill the joints with a width of more than 10mm: gaps in the asphalt surface layer Larger, severe water permeability or slight cracks on the road surface but the road surface strength can meet the requirements, it is necessary to build a sealing layer on the road surface. These maintenance methods can only temporarily solve the cracking problem, not only cannot fundamentally solve the cracking problem, but even cannot effectively prevent the further development of the disease.

In this context, the development of self-healing functional roads has become an inevitable trend in road development in recent years.

In recent years, many countries have studied some self-healing materials, and their advantages and disadvantages are shown in Table 1.

Table 1 List of self-healing road material technologies at home and abroad

For example, the invention patent with the publication number CN102786258A discloses a crack self-healing asphalt concrete and its preparation method. The asphalt concrete contains coarse aggregate, fine aggregate, filler and asphalt, and also contains rigid fibers and flexible fibers. The blending amount is 0.50-2.5 wt% of the total mass of coarse aggregate, fine aggregate, filler and asphalt, and the blending amount of flexible fiber is 0.10-0.35 wt% of the total mass of coarse aggregate, fine aggregate, filler and pitch. The preparation method of the concrete: weigh the dried aggregates and place them in a pan, mix them evenly and preheat them in an oven to 180°C, and heat the filler to 180°C separately; preheat the asphalt to 160-175°C; Rigid fibers and flexible fibers are dried separately according to the required amount for use; firstly, the rigid fibers are mixed into the mixed aggregate for mixing, then mixed with liquid asphalt, then mixed with filler, then mixed with flexible fibers, and finally shaped. The invention minimizes the low-temperature cracking of the asphalt pavement and can self-heal, effectively avoiding early cracking, but the incorporation of fibers has an adverse effect on the concrete, and the strength recovery rate, crack closure rate, durability and fracture of the repaired concrete Can't wait to be sure.

The invention patent with the publication number CN105198281A discloses a self-healing asphalt concrete and its preparation method. The raw materials in parts by mass are: 100 parts of mineral aggregate, 5-6 parts of SBS modified asphalt and 1.5-2.5 parts of magnetic metal . The preparation method comprises the following steps: 1) Preheating the mineral material, modified asphalt and magnetic metal respectively to obtain the preheated mineral material, modified asphalt and magnetic metal respectively; 2) Preheating the ore The compound material, the modified asphalt and the magnetic metal are mixed and stirred to obtain the compound material; 3) the compound material is molded to obtain the compound material. The steel wool is heated by electromagnetic waves, thereby softening the asphalt and re-healing the asphalt pavement, but the heating process consumes a lot of energy, accelerates the aging of asphalt concrete, and seriously pollutes the environment.

Contents of the invention

(1) Technical problems to be solved

The technical problem to be solved by the present invention is that roads are prone to cracks under the joint action of traffic load and temperature change, and under the influence of atmospheric precipitation, if not dealt with in time, it will lead to more serious problems such as potholes, ruts, and pumping. road disease.

(2) Technical solution

The invention provides a bionic self-healing asphalt, which comprises base asphalt and a bionic self-healing asphalt modifier; wherein, the bionic self-healing asphalt modifier includes a self-healing component.

The invention provides bionic self-healing asphalt comprising a bionic self-healing asphalt modifier and matrix asphalt by simulating the healing mechanism of the human body, and uses the composite self-healing asphalt to configure bionic self-healing asphalt road materials to pave roads. The compounding of the modifier containing self-healing components and the base asphalt can better realize the filling of cracks.

In the present invention, the self-healing component is selected from a material that has expansibility at room temperature and can self-proliferate and crystallize. In the conventional natural environment or in the air, materials that can expand, proliferate and crystallize autonomously can be used as the self-healing components of the present invention. Normal temperature is about 25°C.

In order to better fill the cracks, the self-healing component of the present invention is preferably one or more of expanded resin, expanded water-stop glue, expanded cement, and expanded graphite.

Among them, the swelling resin is preferably a superabsorbent swelling resin. Superabsorbent resin is a new type of polymer material, which can absorb hundreds to a thousand times its own weight of water, non-toxic, harmless, and non-polluting; it has extremely strong water absorption capacity and high water retention capacity, and the absorbed water cannot Extruded by simple physical methods, and can release and absorb water repeatedly.

Water-swellable water-stop glue is a rubber elastic body with good recovery properties once it is hardened. After soaking in water, its own volume expands and fills the gap to exert a definite water-stop effect.

Concrete prepared with expansive cement has a free expansion rate of 8×10 ^-4 to 10×10 ^-4 in water, and a self-stress of 0.2 to 0.6 MPa can be established in the concrete to meet the shrinkage compensation requirements and reduce or prevent concrete shrinkage and cracking.

These several substances can be used as the self-healing component separately, and any combination of several substances can also be used as the self-healing component.

Further preferably, the self-healing component comprises expansive resin and expansive cement, and more preferably, the self-healing component comprises expansive resin and expansive cement, and the weight ratio of the two is preferably 50-95:5-50; further preferably, two The weight ratio of the latter is 63-90:10-37, more preferably 74-85:15-26. In the above proportions, the instantaneous water blocking ability and long-term water blocking ability of the mixture prepared from asphalt are good. In the present invention, the self-healing component may be the expansion resin and expansion cement in the above ratio.

In order to improve the adhesion between asphalt and the road surface and effectively prevent the mineral material from peeling off, the bionic self-healing asphalt modifier also includes anti-stripping components. In order to better combine with the above self-healing components, improve Adhesion, improve the cohesiveness of the asphalt obtained by the modifier and the original road surface, the anti-stripping component in the present invention is preferably one or more of calcium lignosulfonate, sodium lignosulfonate and petroleum resin kind.

Calcium lignosulfonate is non-toxic and has good stability, dispersibility and cohesiveness. Sodium lignosulfonate has good stability and dispersibility, and can be adsorbed on the surface of various solid particles. Petroleum resin has good chemical stability, and has the characteristics of good viscosity adjustment and thermal stability, and is cheap, non-toxic and environmentally friendly. These several substances can be used as the anti-stripping component separately, and any combination of several substances can also be used as the anti-stripping component. When any combination of several substances is selected, the ratio of various substances can be selected arbitrarily, as long as the final content of the prepared anti-stripping component meets the requirements, no matter which of the above substances or the ratio of various substances is selected However, the corresponding adhesion performance can be achieved, and the effect of preventing the cement compound from being squeezed out is similar.

Further preferably, the anti-stripping component includes calcium lignosulfonate, sodium lignosulfonate and petroleum resin, the weight ratio of the three is 5-90:5-45:5-80, preferably, the weight ratio of the three Preferably it is 10-35:15-30:35-75. In the present invention, the anti-stripping component may be calcium lignosulfonate, sodium lignosulfonate and petroleum resin in the above ratio.

Alternatively, the anti-stripping component includes calcium lignosulfonate and petroleum resin, and the weight ratio of the two is 20-50:50-80, preferably 40-50:50-60. In the present invention, the anti-stripping component may be calcium lignosulfonate and petroleum resin in the above ratio.

Alternatively, the anti-peeling component includes sodium lignosulfonate and petroleum resin, and the weight ratio of the two is 40-50:50-60. In the present invention, the anti-stripping component may be sodium lignosulfonate and petroleum resin in the above ratio.

Alternatively, the anti-stripping component includes calcium lignosulfonate and sodium lignosulfonate, and the weight ratio of the two is 60-70:30-40. In the present invention, the anti-stripping component may be calcium lignosulfonate and sodium lignosulfonate in the above ratio.

In order to improve the effect of self-healing and preventing pavement cracking, in a preferred embodiment of the present invention, the modifier includes 50-90 parts by weight of self-healing components and 10-50 parts by weight of anti-peeling components; preferably, includes self-healing components 60-85 parts by weight of the healing component and 15-40 parts by weight of the anti-peeling component; further preferably, 70-80 parts by weight of the self-healing component and 20-30 parts by weight of the anti-peeling component.

Wherein, in the present invention, parts by weight can be μg, mg, g, kg and other well-known weight units in the art, and can also be multiples thereof, such as 1/10, 1/100, 10 times, 100 times, etc.

Expressed by mass percent in the modifier, the self-healing component is 50-90 wt%, and the anti-peeling component is 10-50 wt%. In the present invention, when the added amount of the self-healing component is lower than 50%, the effect of crack healing is poor; when the added amount of the self-healing component is higher than 90%, the effect of crack healing will not be significantly improved. Or the effect of crack healing is basically unchanged, so continue to add self-healing components, resulting in waste of raw materials and increased costs. And when the addition of the anti-stripping component is less than 10%, the adhesion is not good, and some cement compounds will crack; when the addition of the anti-stripping component is higher than 50%, the adhesion will not be significantly improved. Or the adhesion effect remains basically unchanged, so the anti-peeling component is continued to be added, resulting in waste of raw materials and increased costs.

Only by adding an appropriate amount of self-healing components and anti-stripping components can the bionic self-healing asphalt modifier with the best effect be formed. Realized the function of road self-healing.

In order to make the obtained bionic self-healing asphalt effectively absorb road surface moisture, effectively seal cracks, and have a good self-healing effect, in another preferred embodiment of the present invention, the weight ratio of base asphalt to bionic self-healing asphalt modifier is 10-80:20-90, preferably 20-70:30-80.

That is, the mass percentage of each component in the bionic self-healing asphalt is 10-80% of the base asphalt, 20-90% of the bionic self-healing asphalt modifier; preferably, 20-70% of the base asphalt, 20-70% of the bionic self-healing Asphalt modifier 30-80%.

In a preferred embodiment of the present invention, in order to absorb road surface moisture more effectively and further improve the self-healing effect, the biomimetic self-healing asphalt includes base asphalt and biomimetic self-healing asphalt with a weight ratio of 10-80:20-90 Modifier; the bionic self-healing asphalt modifier includes 50-90 parts by weight of self-healing components and 10-50 parts by weight of anti-stripping components; the self-healing components include expansive resin and expansive cement, and the weight ratio of the two is 50-95:5-50; the anti-stripping component includes calcium lignosulfonate, sodium lignosulfonate and petroleum resin, and the weight ratio of the three is 5-90:5-45:5-80.

In order to further improve the self-healing performance, based on the above examples, the weight ratio of the three anti-peeling components is preferably 10-35:15-30:35-75.

In yet another preferred embodiment of the present invention, in order to further improve performance, the bionic self-healing asphalt includes base asphalt and bionic self-healing asphalt modifier with a weight ratio of 10-80:20-90; the bionic self-healing asphalt modifier The agent includes 50-90 parts by weight of self-healing components and 10-50 parts by weight of anti-peeling components; the self-healing components include expansion resin and expansion cement, and the weight ratio of the two is 50-95:5-50; anti-peeling Components include calcium lignosulfonate and petroleum resin, the weight ratio of the two is 20-50:50-80, preferably 40-50:50-60, or the anti-stripping component includes sodium lignosulfonate and Petroleum resin, the weight ratio of the two is 40-50:50-60, or the anti-stripping component includes calcium lignosulfonate and sodium lignosulfonate, the weight ratio of the two is 60-70:30-40 .

In a preferred embodiment, the self-healing component is composed of expansive resin and expansive cement, and the weight ratio of the two is 63-90:10-37, more preferably 74-85:15-26.

In the present invention, the AC-13 type asphalt mixture is preferred as the basic pavement material. After a large number of tests, it has been proved that when the compound combination of expansive resin and expansive cement is selected, the bionic self-healing asphalt mixture (SHAC-13 Modified asphalt mixture) has the best instantaneous water resistance and long-term self-healing properties, and can achieve the best crack self-healing effect.

According to one aspect of the present invention, also provide the preparation method of above-mentioned bionic self-healing asphalt, comprising:

(1) heating base asphalt to mixing temperature;

(2) Add the biomimetic self-healing asphalt modifier to the base asphalt in step (1), stir and develop, and the product is obtained.

Preferably, the mixing temperature of the base asphalt and the biomimetic self-healing asphalt modifier in step (2) is 110-160°C, preferably 130-150°C.

Preferably, the mixing time of the base asphalt and the biomimetic self-healing asphalt modifier in step (2) is 5-60 minutes, preferably 20-40 minutes.

At the above mixing temperature and mixing time, the base asphalt and the biomimetic self-healing asphalt modifier can be fully mixed evenly.

Preferably, in step (2), the development temperature of the base asphalt and the biomimetic self-healing asphalt modifier is 130-150° C., and the development time is 20-40 minutes.

In the present invention, development is typically placed in an oven.

Preferably, the mixing method of the base asphalt and the biomimetic self-healing asphalt modifier is shear stirring, and the stirring rate is 2000-10000r/min. A shearing device is used for high-speed stirring, and the stirring rate is preferably 4000-6000 r/min.

In the present invention, the preparation method of the above-mentioned bionic self-healing asphalt modifier preferably includes: weighing the self-healing component and the anti-stripping component according to the proportion, and stirring to obtain the obtained product.

Among them, the self-healing component and the anti-stripping component are usually put into the mixing equipment for mixing.

In a preferred embodiment of the present invention, the mixing temperature of the self-healing component and the anti-peeling component is 20-40°C.

At a temperature of 20-40°C, both the self-healing component and the anti-stripping component in the present invention are in a free-flowing state, with good fluidity, which is conducive to the full mixing of the two, and the prepared bionic self-healing asphalt The modifier is liquid and has good fluidity. More preferably, the stirring temperature is 25-30°C. More preferably, the mixing temperature of the self-healing component and the anti-peeling component is normal temperature (about 25° C.).

In order to fully mix the two, the mixing time of the self-healing component and the anti-peeling component is 90-150s, preferably, the mixing time is 100-120s. During the stirring time mentioned above, the two substances can be thoroughly mixed evenly.

(3) Beneficial effects

(1) The bionic self-healing asphalt proposed by the present invention and its preparation method organically combine the modifier containing the self-healing component with the asphalt base, so that the obtained bionic self-healing asphalt does not affect the asphalt pavement performance Under the premise that the road has the same self-healing function as the human body, it can effectively fill the cracks in the road surface or roadbed, reduce the damage of rainwater to the roadbed, and prolong its service life. The process is simple, the operation is convenient, the preparation process is pollution-free, and the cost is low;

(2) The bionic self-healing asphalt prepared by this method can be used as a cement to pave roads to achieve the effect of road self-healing, thus fundamentally solving the problem of road cracking;

(3) The bionic self-healing asphalt of the present invention is non-toxic, non-polluting, non-corrosive, common raw materials, easy to obtain, low in price, good self-healing effect, friendly to the environment, and has important economic and social significance . The bionic self-healing asphalt can be widely used in urban roads, streets, airports, docks, mines and other areas.

Detailed ways

The specific implementation manners of the present invention will be further described in detail below in conjunction with typical embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

All materials involved in the following examples are known commercially available products. Among them, the expansive cement is prepared by adding UEA concrete expansive agent to cement. The UEA concrete expansive agent is purchased from Hongxiang, the cement is purchased from Gaoxing, the expansive resin is purchased from Quanxing, and the base asphalt is AC-13 type asphalt mixture.

Example 1

This embodiment provides a bionic self-healing asphalt, including base asphalt and a bionic self-healing asphalt modifier.

Wherein, the mass percentage of the base asphalt is 20%, and the mass percentage of the bionic self-healing asphalt modifier is 80%.

Among them, the bionic self-healing asphalt modifier includes self-healing components and anti-stripping components. The self-healing component includes expansive resin and expansive cement, and the anti-peeling component includes calcium lignosulfonate, sodium lignosulfonate and petroleum resin.

In the bionic self-healing asphalt modifier of this embodiment, the mass percentage of the self-healing component is 80%, and the mass percentage of the anti-stripping component is 20%.

The mass percent of each substance in the self-healing component is: 50% of the expansion resin and 50% of the expansion cement.

The mass percent of each substance in the anti-peeling component is: 35% of calcium lignosulfonate, 30% of sodium lignosulfonate and 35% of petroleum resin.

Taking the preparation of 10000g of bionic self-healing asphalt as an example, 2000g of base asphalt and 8000g of bionic self-healing asphalt modifier are required. In the process of preparing the bionic self-healing asphalt modifier, 6400g of self-healing components and 1600g of anti-stripping components are required.

This embodiment also provides the preparation method of the above-mentioned bionic self-healing asphalt, as follows:

(1) heating base asphalt to mixing temperature;

(2) Adding the bionic self-healing asphalt modifier to the base asphalt heated to the mixing temperature for mixing;

(3) Put the mixture of the mixed base asphalt and the biomimetic self-healing asphalt modifier into an oven for development.

In step (1), the mixing temperature of the base asphalt and the biomimetic self-healing asphalt modifier is 110°C, and the mixing time is 60 minutes; high-speed mixing is performed using a shearing instrument, and the stirring rate is 4000r/min. In step (3), the development temperature of the base asphalt and the biomimetic self-healing asphalt modifier is 130°C, and the development time is 40 minutes.

Wherein, the preparation method of the bionic self-healing asphalt modifier includes:

(1) Weighing the self-healing component and the anti-stripping component according to a certain ratio;

(2) Put the self-healing component and the anti-peeling component into the mixing equipment for mixing.

Among them, the mixing temperature of the self-healing component and the anti-peeling component is 25°C, and the mixing time is 100s. The rotational speed of the stirrer is 40r/min.

Example 2

This embodiment provides a bionic self-healing asphalt, including base asphalt and a bionic self-healing asphalt modifier.

Wherein, the mass percentage of the base asphalt is 10%, and the mass percentage of the bionic self-healing asphalt modifier is 90%.

Among them, the bionic self-healing asphalt modifier includes self-healing components and anti-stripping components. The self-healing component includes expansive resin and expansive cement, and the anti-stripping component includes calcium lignosulfonate and petroleum resin.

In the bionic self-healing asphalt modifier of this embodiment, the mass percentage of the self-healing component is 90%, and the mass percentage of the anti-stripping component is 10%.

The mass percentages of each substance in the self-healing component are: 63% of expansion resin and 37% of expansion cement.

The mass percent of each substance in the anti-peeling component is: 50% of calcium lignosulfonate and 50% of petroleum resin.

Taking the preparation of 10,000g of bionic self-healing asphalt as an example, 1,000g of base asphalt and 9,000g of bionic self-healing asphalt modifier are required. In the process of preparing the bionic self-healing asphalt modifier, 8550g of self-healing components and 450g of anti-stripping components are required.

This embodiment also provides the preparation method of the above-mentioned bionic self-healing asphalt, as follows:

(1) heating base asphalt to mixing temperature;

(2) Adding the bionic self-healing asphalt modifier to the base asphalt heated to the mixing temperature for mixing;

(3) Put the mixture of the mixed base asphalt and the biomimetic self-healing asphalt modifier into an oven for development.

In step (1), the mixing temperature of the base asphalt and the biomimetic self-healing asphalt modifier is 160° C., and the mixing time is 5 minutes; high-speed mixing is performed using a shearing instrument, and the stirring rate is 6000 r/min. In step (3), the development temperature of the base asphalt and the biomimetic self-healing asphalt modifier is 150°C, and the development time is 20 minutes.

Wherein, the preparation method of the bionic self-healing asphalt modifier includes:

(1) Weighing the self-healing component and the anti-stripping component according to a certain ratio;

(2) Put the self-healing component and the anti-peeling component into the mixing equipment for mixing.

Among them, the mixing temperature of the self-healing component and the anti-stripping component is 30° C., and the mixing time is 110 s. The rotational speed of the stirrer is 40r/min.

Example 3

This embodiment provides a bionic self-healing asphalt, including base asphalt and a bionic self-healing asphalt modifier.

Wherein, the mass percentage of the base asphalt is 70%, and the mass percentage of the bionic self-healing asphalt modifier is 30%.

Among them, the bionic self-healing asphalt modifier includes self-healing components and anti-stripping components. The self-healing component includes expansive resin and expansive cement, and the anti-stripping component includes sodium lignosulfonate and petroleum resin.

In the bionic self-healing asphalt modifier of this embodiment, the mass percentage of the self-healing component is 70%, and the mass percentage of the anti-stripping component is 30%.

The mass percentages of each substance in the self-healing component are: 74% of expansion resin and 26% of expansion cement.

The mass percent of each substance in the anti-peeling component is: 40% of sodium lignosulfonate and 60% of petroleum resin.

Taking the preparation of 10,000g of bionic self-healing asphalt as an example, 7,000g of base asphalt and 3,000g of bionic self-healing asphalt modifier are required. In the process of preparing the bionic self-healing asphalt modifier, 2100g of self-healing components and 900g of anti-stripping components are required.

This embodiment also provides the preparation method of the above-mentioned bionic self-healing asphalt, as follows:

(1) heating base asphalt to mixing temperature;

(2) Adding the bionic self-healing asphalt modifier to the base asphalt heated to the mixing temperature for mixing;

(3) Put the mixture of the mixed base asphalt and the biomimetic self-healing asphalt modifier into an oven for development.

In step (1), the mixing temperature of the base asphalt and the biomimetic self-healing asphalt modifier is 130°C, and the mixing time is 40 minutes; high-speed mixing is performed using a shearing instrument, and the stirring rate is 2000r/min. In step (3), the development temperature of the base asphalt and the biomimetic self-healing asphalt modifier is 140°C, and the development time is 30 minutes.

Wherein, the preparation method of the bionic self-healing asphalt modifier includes:

(1) Weighing the self-healing component and the anti-stripping component according to a certain ratio;

(2) Put the self-healing component and the anti-peeling component into the mixing equipment for mixing.

Among them, the mixing temperature of the self-healing component and the anti-peeling component is 20°C, and the mixing time is 140s. The rotational speed of the stirrer is 40r/min.

Example 4

This embodiment provides a bionic self-healing asphalt, including base asphalt and a bionic self-healing asphalt modifier.

Wherein, the mass percentage of the base asphalt is 80%, and the mass percentage of the bionic self-healing asphalt modifier is 20%.

Among them, the bionic self-healing asphalt modifier includes self-healing components and anti-stripping components. The self-healing component includes expansive resin and expansive cement, and the anti-peeling component includes calcium lignosulfonate, sodium lignosulfonate and petroleum resin.

In the bionic self-healing asphalt modifier of this embodiment, the mass percentage of the self-healing component is 50%, and the mass percentage of the anti-stripping component is 50%.

The mass percentages of each substance in the self-healing component are: 85% of expansion resin and 15% of expansion cement.

The mass percent of each substance in the anti-peeling component is: 70% of calcium lignosulfonate, 10% of sodium lignosulfonate and 20% of petroleum resin.

Taking the preparation of 10000g of bionic self-healing asphalt as an example, 8000g of base asphalt and 2000g of bionic self-healing asphalt modifier are required. In the process of preparing the bionic self-healing asphalt modifier, 1000g of self-healing components and 1000g of anti-stripping components are required.

This embodiment also provides the preparation method of the above-mentioned bionic self-healing asphalt, as follows:

(1) heating base asphalt to mixing temperature;

(2) Adding the bionic self-healing asphalt modifier to the base asphalt heated to the mixing temperature for mixing;

(3) Put the mixture of the mixed base asphalt and the biomimetic self-healing asphalt modifier into an oven for development.

In step (1), the mixing temperature of the base asphalt and the biomimetic self-healing asphalt modifier is 150°C, and the mixing time is 20 minutes; high-speed mixing is performed using a shearing instrument, and the stirring rate is 10000r/min. In step (3), the development temperature of the base asphalt and the biomimetic self-healing asphalt modifier is 130°C, and the development time is 30 minutes.

Wherein, the preparation method of the bionic self-healing asphalt modifier includes:

(1) Weighing the self-healing component and the anti-stripping component according to a certain ratio;

(2) Put the self-healing component and the anti-peeling component into the mixing equipment for mixing.

Among them, the mixing temperature of the self-healing component and the anti-stripping component is 25°C, and the mixing time is 110s. The rotational speed of the stirrer is 40r/min.

Example 5

This embodiment also provides a bionic self-healing asphalt, including base asphalt and the above-mentioned bionic self-healing asphalt modifier.

Wherein, the mass percentage of the base asphalt is 40%, and the mass percentage of the bionic self-healing asphalt modifier is 60%.

Among them, the bionic self-healing asphalt modifier includes self-healing components and anti-stripping components. The self-healing component includes expansive resin and expansive cement, and the anti-stripping component includes calcium lignosulfonate.

In the bionic self-healing asphalt modifier of this embodiment, the mass percentage of the self-healing component is 60%, and the mass percentage of the anti-stripping component is 40%.

The mass percent of each substance in the self-healing component is: 90% of expansion resin and 10% of expansion cement.

Taking the preparation of 10000g of bionic self-healing asphalt as an example, 4000g of base asphalt and 6000g of bionic self-healing asphalt modifier are required. In the process of preparing the bionic self-healing asphalt modifier, 3600g of self-healing components and 2400g of anti-stripping components are required.

This embodiment also provides the preparation method of the above-mentioned bionic self-healing asphalt, as follows:

(1) heating base asphalt to mixing temperature;

(2) Adding the bionic self-healing asphalt modifier to the base asphalt heated to the mixing temperature for mixing;

(3) Put the mixture of the mixed base asphalt and the biomimetic self-healing asphalt modifier into an oven for development.

In step (1), the mixing temperature of the base asphalt and the biomimetic self-healing asphalt modifier is 140°C, and the mixing time is 30 minutes; high-speed mixing is performed using a shearing instrument, and the stirring rate is 4000r/min. In step (3), the development temperature of the base asphalt and the biomimetic self-healing asphalt modifier is 140°C, and the development time is 40 minutes.

Wherein, the preparation method of the bionic self-healing asphalt modifier includes:

(1) Weighing the self-healing component and the anti-stripping component according to a certain ratio;

(2) Put the self-healing component and the anti-peeling component into the mixing equipment for mixing.

Among them, the mixing temperature of the self-healing component and the anti-peeling component is 25°C, and the mixing time is 120s. The rotational speed of the stirrer is 40r/min.

Example 6

This embodiment also provides a bionic self-healing asphalt, including base asphalt and the above-mentioned bionic self-healing asphalt modifier.

Wherein, the mass percentage of the base asphalt is 30%, and the mass percentage of the bionic self-healing asphalt modifier is 70%.

Among them, the bionic self-healing asphalt modifier includes self-healing components and anti-stripping components. The self-healing component includes expansive resin and expansive cement, and the anti-peeling component includes calcium lignosulfonate, sodium lignosulfonate and petroleum resin.

In the bionic self-healing asphalt modifier of this embodiment, the mass percentage of the self-healing component is 85%, and the mass percentage of the anti-stripping component is 15%.

The mass percentages of each substance in the self-healing component are: 95% of expansion resin and 5% of expansion cement.

The mass percent of each substance in the anti-peeling component is: calcium lignosulfonate 5%, sodium lignosulfonate 80% and petroleum resin 15%.

Taking the preparation of 10000g of bionic self-healing asphalt as an example, 3000g of base asphalt and 7000g of bionic self-healing asphalt modifier are required. In the process of preparing the bionic self-healing asphalt modifier, 5950g of self-healing components and 1050g of anti-stripping components are required.

This embodiment also provides the preparation method of the above-mentioned bionic self-healing asphalt, as follows:

(1) heating base asphalt to mixing temperature;

(2) Adding the bionic self-healing asphalt modifier to the base asphalt heated to the mixing temperature for mixing;

(3) Put the mixture of the mixed base asphalt and the biomimetic self-healing asphalt modifier into an oven for development.

In step (1), the mixing temperature of the base asphalt and the biomimetic self-healing asphalt modifier is 135° C., and the mixing time is 50 minutes; high-speed mixing is performed using a shearing instrument, and the stirring rate is 5000 r/min. In step (3), the development temperature of the base asphalt and the biomimetic self-healing asphalt modifier is 135°C, and the development time is 30 minutes.

Wherein, the preparation method of the bionic self-healing asphalt modifier includes:

(1) Weighing the self-healing component and the anti-stripping component according to a certain ratio;

(2) Put the self-healing component and the anti-peeling component into the mixing equipment for mixing.

Among them, the mixing temperature of the self-healing component and the anti-peeling component is 25°C, and the mixing time is 120s. The rotational speed of the stirrer is 40r/min.

Example 7

This embodiment provides a bionic self-healing asphalt mixture, including mineral aggregates and bionic self-healing asphalt. Bionic self-healing asphalt includes base asphalt and bionic self-healing asphalt modifier. The bionic self-healing asphalt modifier includes self-healing components and anti-stripping components.

In this embodiment, the self-healing component includes expansive resin and expansive cement, and the anti-stripping component includes calcium lignosulfonate, sodium lignosulfonate and petroleum resin.

In this embodiment, the mineral aggregate is basalt.

In the bionic self-healing asphalt mixture of this embodiment, the mass percentage of mineral aggregate is 80%, and the mass percentage of bionic self-healing asphalt is 20%.

In the bionic self-healing asphalt of this embodiment, the mass percentage of the base asphalt is 20%, and the mass percentage of the bionic self-healing asphalt modifier is 80%.

In the bionic self-healing asphalt modifier of this embodiment, the mass percentage of the self-healing component is 80%, and the mass percentage of the anti-stripping component is 20%.

Taking the preparation of 10,000g of bionic self-healing asphalt mixture as an example, 8,000g of mineral aggregate is required, and 2,000g of bionic self-healing asphalt is required. In the process of preparing bionic self-healing asphalt, 400g of base asphalt and 1600g of bionic self-healing asphalt modifier are required. In the process of preparing the bionic self-healing asphalt modifier, 1280g of self-healing components and 320g of anti-stripping components are required. In this embodiment, the particle size of mineral aggregates and the mass percentage of mineral aggregates of each particle size are shown in Table 2.

Table 2 The particle size of mineral aggregates and the mass percentage of mineral aggregates of each particle size

The preparation method of the above-mentioned bionic self-healing asphalt mixture is as follows:

(1) Preparation of bionic self-healing asphalt;

(2) Mix the bionic self-healing asphalt and mineral aggregate at a certain temperature. The mixing temperature of mineral aggregate and biomimetic self-healing asphalt was 100℃, and the mixing time was 150s.

The preparation method of the above-mentioned bionic self-healing asphalt modifier is as follows:

(1) Weighing the self-healing component and the anti-stripping component according to a certain ratio;

(2) Put the self-healing component and the anti-peeling component into the mixing equipment for mixing.

The mass percentage of each substance in the self-healing component is 50% of the expansion resin and 50% of the expansion cement. The mass percent of each substance in the anti-peeling component is 90% of calcium lignosulfonate, 5% of sodium lignosulfonate and 5% of petroleum resin.

The mixing temperature of the self-healing component and the anti-peeling component is 25°C, and the mixing time is 110s. The rotational speed of the stirrer is 40r/min.

The preparation method of the above-mentioned bionic self-healing asphalt is as follows:

(1) heating base asphalt to mixing temperature;

(2) Adding the bionic self-healing asphalt modifier to the base asphalt heated to the mixing temperature for mixing;

(3) Put the mixture of the mixed base asphalt and the biomimetic self-healing asphalt modifier into an oven for development.

The mixing temperature of base asphalt and biomimetic self-healing asphalt modifier was 110°C, and the mixing time was 60 minutes; the development temperature of base asphalt and biomimetic self-healing asphalt modifier was 130°C, and the development time was 40 minutes. High-speed stirring is carried out with a shearing device, and the stirring rate is 4000r/min.

Example 8

This embodiment provides a bionic self-healing asphalt mixture and a preparation method thereof, and other steps are the same as in Embodiment 7, except that:

In the bionic self-healing asphalt mixture of this embodiment, the mass percentage of mineral aggregates is 99%, and the mass percentage of bionic self-healing asphalt is 1%.

In the bionic self-healing asphalt of this embodiment, the mass percentage of the base asphalt is 40%, and the mass percentage of the bionic self-healing asphalt modifier is 60%.

In the bionic self-healing asphalt modifier of this embodiment, the mass percentage of the self-healing component is 70%, and the mass percentage of the anti-stripping component is 30%.

The self-healing component in this embodiment includes expansive resin and expansive cement, and the anti-stripping component includes calcium lignosulfonate and petroleum resin. The mass percentages of each substance in the self-healing component are: 63% of expansion resin and 37% of expansion cement. The mass percent of each substance in the anti-peeling component is: 20% of calcium lignosulfonate and 80% of petroleum resin.

Embodiment 9:

This embodiment provides a bionic self-healing asphalt mixture and a preparation method thereof, and other steps are the same as in Embodiment 7, except that:

In the bionic self-healing asphalt mixture of this embodiment, the mass percentage of mineral aggregates is 90%, and the mass percentage of bionic self-healing asphalt is 10%.

In the bionic self-healing asphalt of this embodiment, the mass percentage of the base asphalt is 70%, and the mass percentage of the bionic self-healing asphalt modifier is 30%.

In the bionic self-healing asphalt modifier of this embodiment, the mass percentage of the self-healing component is 85%, and the mass percentage of the anti-stripping component is 15%.

The self-healing component in this embodiment includes expansion resin and expansion cement combination, and the anti-stripping component includes calcium lignosulfonate and sodium lignosulfonate. The mass percent of each substance in the self-healing component is 74% of the expansion resin and 26% of the expansion cement. The mass percent of each substance in the anti-stripping component is 65% of calcium lignosulfonate and 35% of sodium lignosulfonate.

Example 10:

This embodiment provides a bionic self-healing asphalt mixture and a preparation method thereof, and other steps are the same as in Embodiment 7, except that:

In the bionic self-healing asphalt mixture of this embodiment, the mass percentage of mineral aggregates is 97%, and the mass percentage of bionic self-healing asphalt is 3%.

In the bionic self-healing asphalt of this embodiment, the mass percentage of the base asphalt is 80%, and the mass percentage of the bionic self-healing asphalt modifier is 20%.

In the bionic self-healing asphalt modifier of this embodiment, the mass percentage of the self-healing component is 90%, and the mass percentage of the anti-stripping component is 10%.

The self-healing component in this embodiment includes expansion resin and expansion cement combination, and the anti-stripping component includes calcium lignosulfonate, sodium lignosulfonate and petroleum resin. The mass percent of each substance in the self-healing component is 85% of the expansion resin and 15% of the expansion cement. The mass percent of each substance in the anti-peeling component is 10% of calcium lignosulfonate, 15% of sodium lignosulfonate and 75% of petroleum resin.

Example 11:

This embodiment provides a bionic self-healing asphalt mixture and a preparation method thereof, and other steps are the same as in Embodiment 7, except that:

In the bionic self-healing asphalt mixture of this embodiment, the mass percentage of mineral aggregates is 90%, and the mass percentage of bionic self-healing asphalt is 10%.

In the bionic self-healing asphalt of this embodiment, the mass percentage of the base asphalt is 10%, and the mass percentage of the bionic self-healing asphalt modifier is 90%.

In the bionic self-healing asphalt modifier of this embodiment, the mass percentage of the self-healing component is 90%, and the mass percentage of the anti-stripping component is 10%.

In this embodiment, the self-healing component includes expansion resin and expansion cement combination, and the anti-stripping component includes calcium lignosulfonate, sodium lignosulfonate and petroleum resin. The mass percentage of each substance in the self-healing component is 90% of the expansion resin and 10% of the expansion cement. The mass percent of each substance in the anti-peeling component is 15% of calcium lignosulfonate, 45% of sodium lignosulfonate and 40% of petroleum resin.

Example 12:

This embodiment provides a bionic self-healing asphalt mixture and a preparation method thereof, and other steps are the same as in Embodiment 7, except that:

In the bionic self-healing asphalt mixture of this embodiment, the mass percentage of mineral aggregates is 85%, and the mass percentage of bionic self-healing asphalt is 15%.

In the bionic self-healing asphalt of this embodiment, the mass percentage of the base asphalt is 30%, and the mass percentage of the bionic self-healing asphalt modifier is 70%.

In the bionic self-healing asphalt modifier of this embodiment, the mass percentage of the self-healing component is 75%, and the mass percentage of the anti-stripping component is 25%.

In this embodiment, the self-healing component includes expansion resin and expansion cement combination, and the anti-stripping component includes calcium lignosulfonate, sodium lignosulfonate and petroleum resin. The mass percent of each substance in the self-healing component is 95% of the expansion resin and 5% of the expansion cement. The mass percent of each substance in the anti-stripping component is 34% of calcium lignosulfonate, 33% of sodium lignosulfonate and 33% of petroleum resin.

Test case

According to the "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTJ E20-2011), the bionic self-healing asphalt prepared in Examples 1 to 6 was tested for performance such as penetration, ductility, and softening point, and the test results as shown in Table 3.

Table 3 Performance test results of bionic self-healing asphalt

The bionic self-healing asphalt mixtures prepared in Examples 7 to 12 were tested for low-temperature crack resistance, high-temperature dynamic stability, and freeze-thaw splitting. The test results are shown in Table 4-6. From the test results, the low-temperature crack resistance, high-temperature stability and freeze-thaw splitting performance of the biomimetic self-healing asphalt mixture are basically unchanged.

Table 4 Test results of low temperature crack resistance of bionic self-healing asphalt mixture

Example number Maximum load (N) Mid-span deflection (mm) 90# ordinary asphalt mixture 1994 2.30 Example 7 1982 2.27 Example 8 1978 2.22 Example 9 1975 2.25 Example 10 1974 2.29 Example 11 1978 2.30 Example 12 1981 2.27

Table 5 Test results of high temperature stability of bionic self-healing asphalt mixture

Table 6 Test results of freeze-thaw splitting performance of bionic self-healing asphalt mixture

Prepare Marshall test samples according to the "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-211), press the test samples with a road strength meter to create a crack with a width of 2 mm, and place the prepared samples in a dry environment for 72 hours Afterwards, the water resistance test was carried out.

The test sample (m ₀ , g) was tested for instantaneous water resistance by drip irrigation in a dry environment. That is, drop 100g of water into the crack, and record the amount of seepage water. See Table 7 for the results of the seepage amount. The amount of seepage water represents the instantaneous water blocking ability of the biomimetic self-healing asphalt mixture, and the greater the instantaneous water blocking ability, the better the self-healing effect.

Table 7 Water seepage of bionic self-healing asphalt mixture

The test sample (m ₀ , g) was tested for long-term self-healing property by drip irrigation in a dry environment. That is, 100g of water was dripped into the crack every day for 4 days, and the seepage water volume was recorded respectively. The results of the average water seepage volume are shown in Table 8. The amount of seepage water represents the long-term self-healing ability of the biomimetic self-healing asphalt mixture. The greater the long-term self-healing ability, the better the self-healing effect and the better the durability.

Table 8 Water seepage of bionic self-healing asphalt mixture

Example number Average water seepage (/100ml) AC-13 ordinary asphalt mixture 50.00 Example 7 10.00 Example 8 9.00 Example 9 7.00 Example 10 8.00 Example 11 9.50 Example 12 9.20

From the test results, the bionic self-healing asphalt mixture has excellent long-term self-healing properties.

Finally, the method of the present invention is only a preferred embodiment, and is not intended to limit the protection scope of the present invention. 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 (11)

1. a kind of bionical self-healing property pitch, including matrix pitch and bionical self-healing property asphalt modifier；Wherein, the bionical self-healing Property asphalt modifier includes self-healing component 50-90 parts by weight and anti-strip component 10-50 parts by weight；The self-healing component includes swollen Swollen resin and expanding cement, the weight ratio of the two are 50-95:5-50；The anti-strip component includes calcium lignosulfonate, wooden Plain sodium sulfonate and Petropols, the weight ratio of three are 5-90:5-45:5-80；Or the anti-strip component includes sulfomethylated lignin The weight ratio of sour calcium and Petropols, the two is 20-50:50-80 or the anti-strip component includes sodium lignin sulfonate and stone The weight ratio of oleoresin, the two is 40-50:50-60 or the anti-strip component includes calcium lignosulfonate and lignin sulfonic acid Sodium, the weight ratio of the two are 60-70:30-40.

2. bionical self-healing property pitch according to claim 1, which is characterized in that the bionical self-healing property asphalt modifier packet Include self-healing component 60-85 parts by weight and anti-strip component 15-40 parts by weight.

3. bionical self-healing property pitch according to claim 2, which is characterized in that the bionical self-healing property asphalt modifier packet Include self-healing component 70-80 parts by weight and anti-strip component 20-30 parts by weight.

4. bionical self-healing property pitch according to any one of claim 1-3, which is characterized in that the matrix pitch and imitative The weight ratio of raw self-healing property asphalt modifier is 10-80:20-90.

5. bionical self-healing property pitch according to claim 4, which is characterized in that the matrix pitch and bionical self-healing property drip The weight ratio of green modifying agent is 20-70:30-80.

6. the preparation method of bionical self-healing property pitch of any of claims 1-5, comprising:

(1) matrix pitch is heated to mixing and stirring temperature；

(2) bionical self-healing property asphalt modifier is added in the matrix pitch in step (1), is mixed and stirred, development to get.

7. preparation method according to claim 6, which is characterized in that mixing and stirring temperature in the step (2) is 110-160 ℃；Mixing time is 5-60min.

8. preparation method according to claim 7, which is characterized in that mixing and stirring temperature in the step (2) is 130-150 DEG C, mixing time 20-40min.

9. preparation method according to claim 6, which is characterized in that mixed and stirred in the step (2) as shear agitation, stirring Rate is 2000-10000r/min.

10. preparation method according to claim 9, which is characterized in that the stirring rate is 4000-6000r/min.

11. the preparation method according to any one of claim 6-10, which is characterized in that development temperature in the step (2) Degree is 130-150 DEG C, development time 20-40min.