CN104725883A - High-viscosity high-elasticity asphalt based on surface modification of rubber particles, and high-viscosity high-elasticity SMA (stone mastic asphalt) mixture based on surface modification of rubber particles and preparing method thereof - Google Patents

Abstract

The invention discloses a high-viscosity and high-elasticity asphalt-SAM asphalt mixture based on surface modification of rubber particles and a preparation method thereof. The high-viscosity and high-elasticity asphalt uses base asphalt, activated rubber powder, weather-resistant components, tackifying components, plasticizing components, compatibilizing components and crosslinking components as raw materials, and the mass ratio between each component is For: matrix asphalt: activated rubber powder: weather-resistant component: tackifying component: plasticizing component: compatibilizing component: crosslinking component=100:(15～20):(4～6):(2～ 4):(1～3):(1～5):(0.1～1). Applying the high-viscosity and high-elasticity asphalt to the preparation of SMA asphalt mixture can effectively improve the properties of the asphalt mixture such as aging resistance, low temperature performance, high temperature performance and fatigue resistance. The invention overcomes the technical problem of low rubber powder content in the composite modified asphalt and is difficult to apply in asphalt concrete, and is suitable for popularization and use.

Description

A kind of high-viscosity and high-elasticity asphalt based on surface modification of rubber particles, SMA asphalt mixture and preparation method thereof

technical field

The invention belongs to the technical field of building materials, and in particular relates to a high-viscosity and high-elasticity asphalt-SAM mixture based on surface modification of rubber particles and a preparation method thereof.

Background technique

As the country's economy takes off, the scale of the transportation industry is also increasing, and higher requirements are placed on the comprehensive performance (durability, usability and functionality) of road materials. In recent years, research institutions at home and abroad have successively developed a variety of modified asphalt materials to improve the material properties of road asphalt and asphalt mixtures.

Among them, since SBS (styrene-butadiene-styrene block copolymer) and rubber powder have the most obvious effect on improving the viscoelastic properties of asphalt, the current research on asphalt modification technology based on SBS or rubber powder is relatively in-depth. SBS can form a polymer network by dispersing in asphalt, reducing the temperature sensitivity of asphalt. However, research results at home and abroad show that the amount of SBS in asphalt has a limit value (about 8%). After exceeding this amount, the phase inversion of the modified asphalt system will occur, and its performance will be significantly reduced. This factor leads to the impact of SBS on asphalt The improvement of the viscoelastic performance is limited. In addition, rubber powder can significantly improve the elasticity of modified asphalt, but due to the poor storage stability of the rubber particles in the asphalt, special equipment must be used in the construction to "replace and use now", which not only puts forward more stringent requirements for the application process of rubber asphalt requirements, and the segregated rubber asphalt also has a negative impact on the performance of pavement materials.

At present, some studies have used the technology of compound modification of SBS and rubber to further improve the viscoelastic properties of asphalt, but there are obvious technical limitations: first, to ensure that the rubber powder in the compound modified asphalt does not seriously segregation, its dosage can only reach about 5-10%; secondly, due to the use of various modified components, the viscosity of asphalt is significantly increased, and the application of asphalt concrete has the problem of difficulty in ensuring the degree of compaction. Therefore, the current SBS -Rubber powder composite modified asphalt is only mainly used in stress absorbing layer or vibration damping structure.

Contents of the invention

The purpose of the present invention is to provide a high-viscosity and high-elasticity asphalt and SAM asphalt mixture based on the surface modification of rubber particles and its preparation method. The surface activation technology of rubber particles is adopted, and the component matching optimization is carried out for asphalt materials to obtain a high-viscosity Asphalt with high elastic properties, used in the preparation of asphalt mixture can effectively improve the aging resistance, low temperature performance, high temperature performance and fatigue resistance of asphalt mixture.

In order to achieve the above object, the technical solution adopted in the present invention is: a high-viscosity and high-elasticity asphalt based on the surface modification of rubber particles, which is composed of base asphalt, activated rubber powder, weather-resistant components, tackifying components, and plasticizing components. , compatibilizing component and cross-linking component are prepared from raw materials, and the mass ratio between each component is: base asphalt: activated rubber powder: weather-resistant component: tackifying component: plasticizing component: compatibilizing group Points: cross-linking components = 100: (15-20): (4-6): (2-4): (1-3): (1-5): (0.1-1).

In the above scheme, the activated rubber powder is formed by surface activation of the rubber powder and the surface activated component at a mass ratio of 100:(5-30). The specific preparation steps are: put the rubber powder in a stirring pot at 40-60°C Stir for 30-120s; then add the surface-activated components three times, the amount added each time is 10-70% of the total mass of the surface-activated components, and stir for 5-20 minutes each time, the added amount depends on whether there is too much The surface active component flows down, and the rubber particles are not seriously agglomerated; finally, the temperature of the stirring pot is turned off, and the temperature of the stirring pot is lowered to room temperature. After stirring continuously for 30-60 minutes at this stage, the activated rubber powder is obtained.

In the above scheme, the rubber powder is 40 mesh or 80 mesh bias tire vulcanized rubber powder.

In the above scheme, the surface activation component is one or more of aromatic base rubber oil, naphthenic rubber oil and aliphatic hydrocarbon solvent oil mixed in any proportion.

In the above scheme, the base asphalt is 70# or 90# heavy traffic petroleum asphalt; the weather resistance component is linear styrene-butadiene-styrene block copolymer; One or several of C9 petroleum resin and C5 petroleum resin are mixed in any proportion; the plasticizing component is dibutyl phthalate or dioctyl phthalate; the compatibilizing component is furfural extract oil, One or more of the extracted oil from the second line, the extracted oil from the third line, and aromatic oil are mixed in any proportion; the crosslinking component is sulfur or dicumyl peroxide.

The above-mentioned preparation method of high-viscosity and high-elasticity asphalt based on the surface modification of rubber particles comprises the following steps: 1) base asphalt: activated rubber powder: weather-resistant component: tackifying component: plasticizing component: compatibilizing group Points: cross-linking component = 100: (15 ~ 20): (4 ~ 6): (2 ~ 4): (1 ~ 3): (1 ~ 5): (0.1 ~ 1) by weighing each Raw materials; 2) Heat the base asphalt to 160-170°C, turn on the high-speed shearing machine; gradually increase the speed to 2000-3000r/min, then add weather-resistant components, and continue shearing for 10-20 minutes; keep the shearing speed unchanged , add viscosity-increasing components, and continue shearing for 3-5 minutes; then increase the shearing speed to 5000-6000r/min, add activated rubber powder, plasticizing components, and compatibilizing components, and continue high-speed shearing for 20-40 minutes; When the shearing speed is 3000-4000r/min, add the cross-linking component and continue shearing for 20-40min; the above-mentioned shearing process controls the temperature between 185-200°C; 3) After the shearing process is completed, put the sample at 135- Swell and develop in an oven at 145° C. for 30 to 60 minutes; take out the sample from the oven and cool to obtain the high-viscosity and high-elasticity asphalt based on the surface modification of rubber particles.

A high-viscosity and high-elasticity asphalt mixture based on the surface modification of rubber particles. It is prepared from coarse aggregate, fine aggregate, filler, fiber, high-viscosity and high-elasticity asphalt and viscosity control components. The mass ratio between is: coarse aggregate: fine aggregate: filler: fiber: high-viscosity high-elasticity asphalt: viscosity control component=75:(10～15):(8～12):(0.2～0.4): (6.0～6.5): (6～10).

In the above scheme, the viscosity control component is sodium aluminosilicate or sulfonated polystyrene.

In the above scheme, the high-viscosity and high-elasticity asphalt is the above-mentioned high-viscosity and high-elasticity asphalt based on the surface modification of rubber particles; the coarse aggregate is basalt or diabase aggregate, and the crushing value is <10%; the fine aggregate is Limestone, basalt or diabase aggregate; filler is limestone slag powder or slag powder obtained by grinding strong basic rock in magmatic rock; fiber is polyacrylonitrile fiber or polyester fiber. Among them, fine aggregates, fillers, fibers, and high-viscosity and high-elasticity asphalt constitute high-stiffness asphalt mortar, and coarse aggregates constitute the aggregate skeleton.

Preferably, the synthetic gradation scope of described coarse aggregate, fine aggregate, filler is as shown in table 1:

Table 1 Optimum grading range of high-viscosity and high-elasticity asphalt mixture

The above-mentioned preparation method of a high-viscosity and high-elasticity asphalt mixture based on rubber particle surface modification comprises the following steps: 1) by coarse aggregate: fine aggregate: filler: fiber: high-viscosity and high-elasticity asphalt: viscosity control component =75:(10～15):(8～12):(0.2～0.4):(6.0～6.5):(6～10) mass ratio takes each raw material; 2) coarse aggregate, fine aggregate Heating in an oven at 190-200°C for 5-8 hours, heating high-viscosity and high-elasticity asphalt in an oven at 160-170°C for 3-4 hours; 3) sequentially mix coarse aggregate, fine aggregate, high-viscosity and high-elasticity asphalt, Add fiber and viscosity control components into a stirring pot at 160-170°C, stir for 90-180s to obtain the high-viscosity and high-elasticity SMA asphalt mixture; Asphalt concrete.

The beneficial effects of the present invention are:

1) The present invention increases the thickness of the surface swelling transition layer formed by the rubber particles in the asphalt system through the surface activation technology of the rubber particles, and improves the storage stability of the rubber powder in the asphalt colloidal structure; The colloidal structure of asphalt is regulated by substances such as components and cross-linking components, forming a composite elastic network of SBS molecular chains cross-linked with the surface of rubber powder, and weakening the dipole orientation force between polymer macromolecules in asphalt at high temperature, increasing The mobility of the molecular chain can realize the regulation of the asphalt modulus, promote the uniform dispersion of the modifier, and significantly improve the viscoelastic properties of the asphalt, and overcome the traditional rubber powder under the condition of high content (>15wt%). Bitumen is not stable for storage problems.

2) The present invention proposes a new mineral material gradation range of high-viscosity and high-elasticity asphalt mixture. Compared with ordinary asphalt concrete, it has the advantages of high mineral powder content, high fiber content, and high asphalt content. Stiff asphalt mortar and macroporous aggregate skeleton, at the same time, the high-viscosity and high-elasticity asphalt activated by the surface of rubber powder is used as the binder, so that the prepared asphalt concrete (high-viscosity and high-elasticity SMA asphalt mixture) is durable Aging performance, low temperature performance, high temperature performance, water resistance stability and fatigue resistance have all been comprehensively improved.

3) The present invention significantly reduces the compaction difficulty of asphalt concrete by introducing viscosity control components in the preparation process of high-viscosity and high-elasticity asphalt concrete, and realizes the high-viscosity and high-elasticity asphalt concrete within the rolling temperature range of conventional road construction. The paving and rolling construction solves the problem of insufficient compaction of SBS-rubber powder composite modified asphalt applied to asphalt concrete.

4) The present invention increases the amount of rubber powder, which has significant environmental protection significance, and can effectively improve the service performance and durability of road materials, and has significant economic and social benefits.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

In the following examples, unless otherwise specified, all reagents used are commercially available chemical reagents or industrial products.

The weather-resistant component is linear styrene-butadiene-styrene block copolymer (SBS); the base asphalt is 90# heavy traffic petroleum asphalt; the surface activation component is aromatic rubber oil.

Example 1

1) High-viscosity and high-elasticity asphalt

A high-viscosity and high-elasticity asphalt based on the surface modification of rubber particles, with base asphalt, activated rubber powder, weather-resistant components, tackifying components (C5 petroleum resin), plasticizing components (dioctyl phthalate) , compatibilization component (minus second-line extraction oil) and cross-linking component (dicumyl peroxide) are prepared as raw materials, and the specific preparation steps are as follows:

a) Preparation of activated rubber powder: Weigh the raw materials according to the mass ratio of rubber powder (80 mesh bias tire vulcanized rubber powder) and surface activation component to 100:5; first, stir the rubber powder in a stirring pot at 40°C for 120s; Then, divide and add surface activation component three times, the amount that adds for the first time and the second time is 40% of total amount (surface activation component total mass), and stirs 15min respectively, the amount that adds the 3rd is total amount 20%, and stirred for 5 minutes; finally, turn off the heating device of the stirring pot, lower the temperature of the stirring pot to room temperature, and continue stirring for 45 minutes during this process to obtain the surface-activated rubber powder.

b) According to the mass ratio of base asphalt:activated rubber powder:weathering component:tackifying component:plasticizing component:compatibilizing component:crosslinking component=100:18:4.7:3.2:1.7:3.3:0.8 Weigh each raw material.

c) Heat the base asphalt to 170°C, and turn on the high-speed shearing machine; gradually increase the speed to 2000r/min, add weather-resistant components, and continue shearing for 20 minutes; keep the shearing speed unchanged, and add viscosity-increasing components, Continue shearing for 5 minutes; increase the shearing speed to 5500r/min, add activated rubber powder, plasticizing components, and compatibilizing components, and continue high-speed shearing for 30 minutes; reduce the shearing speed to 4000r/min, add crosslinking components, Continue shearing for 40 minutes; control the temperature during the above shearing process between 190°C and 200°C.

d) After the shearing process is completed, the sample is swollen and developed in an oven at 135° C. for 60 minutes; the sample is taken out from the oven and cooled to obtain the high-viscosity and high-elasticity asphalt based on the surface modification of rubber particles.

The performance indicators of the high-viscosity and high-elasticity asphalt based on the surface modification of rubber particles obtained in this embodiment are as described in Table 2:

Table 2 Performance index of high-viscosity and high-elasticity asphalt based on surface modification of rubber particles prepared in Example 1

Test items unit Indicator requirements technical indicators Softening Point ℃ ≥90 92.7 5°C Ductility cm ≥40 59.6 Elastic recovery at 25°C % ≥95 99.6 Viscosity N·m ≥25 32.5

Viscosity at 60°C Pa·s ≥70000 92500

2) High viscosity and high elasticity SMA asphalt mixture

The above-mentioned high-viscosity and high-elasticity asphalt based on the surface modification of rubber particles is applied to the preparation of asphalt mixture. ), fine aggregate (diabase aggregate), filler (limestone powder), fiber (polyacrylonitrile fiber), high-viscosity and high-elasticity asphalt (high-viscosity and high-elasticity asphalt based on surface modification of rubber particles) and viscosity control The component (sodium aluminosilicate) is prepared as a raw material, and the specific preparation steps are as follows:

a) by coarse aggregate: fine aggregate: filler: fiber: high-viscosity high-elasticity asphalt: viscosity control component=75:11:8:0.3:6.5:9 mass ratio takes each raw material, and coarse aggregate, The synthetic gradation of fine aggregates and fillers meets the requirements in Table 3.

b) First, heat coarse aggregate and fine aggregate in an oven at 200°C for 5 hours, and heat high-viscosity and high-elasticity asphalt in an oven at 160°C for 3.5 hours; then, add coarse aggregate, fine aggregate, high Add viscous and high-elasticity asphalt, fillers, fibers, and viscosity control components into a stirring pot at 165°C, stir for 155s, take out the high-viscosity and high-elasticity SMA asphalt mixture, and then roll it at 165°C to obtain a high-viscosity, high-elasticity SMA asphalt mixture. Playing SMA asphalt concrete.

The synthetic gradation of the high-viscosity and high-elasticity SMA asphalt concrete prepared in this example is shown in Table 3, and its performance indicators are shown in Table 4.

Table 3 The gradation range of the high-viscosity and high-elasticity SMA asphalt mixture described in Example 1

Table 4 Performance indicators of the high-viscosity and high-elasticity SMA asphalt mixture obtained in Example 1

performance parameter unit Indicator requirements technical indicators porosity % 3～4 3.4 Dynamic stability at 60°C times/mm >8000 9304 Water immersion residual stability % ≥90 92.8 freeze-thaw splitting strength ratio % ≥85 93.1 Maximum bending and tensile strain at low temperature με ≥3000 3588

Example 2

1) High-viscosity and high-elasticity asphalt

A kind of high-viscosity and high-elasticity asphalt based on the surface modification of rubber particles, with base asphalt, activated rubber powder, weather-resistant components, tackifying components (adhesive resin), plasticizing components (dibutyl phthalate) , compatibilizing component (furfural extract oil) and crosslinking component (sulfur) are prepared as raw materials, and the specific preparation steps are as follows:

a) Preparation of activated rubber powder: Weigh the raw materials according to the mass ratio of rubber powder (40 mesh or 80 mesh bias tire vulcanized rubber powder) to the surface active component as 100:25; first put the rubber powder in a stirring pot at 50°C Stir for 80s; Then, add the surface active component in three stages, the amount added for the first time is 20% of the total amount (the total mass of the surface active component), stir for 5min, and the amount added for the second time is 30% of the total amount %, stirred for 15 minutes, the amount added for the third time was 50% of the total amount, stirred for 20 minutes; finally, the heating device of the stirring pot was turned off, and the temperature of the stirring pot was lowered to room temperature. During this process, the stirring was continued for 30 minutes to obtain the surface Activated rubber powder.

b) According to the mass ratio of base asphalt:activated rubber powder:weathering component:tackifying component:plasticizing component:compatibilizing component:crosslinking component=100:15:5.2:2.0:1.3:2.2:0.8 Weigh each raw material.

c) Heat the base asphalt to 160°C, and turn on the high-speed shearing machine; gradually increase the speed to 2500r/min, add weather-resistant components, and continue shearing for 15 minutes; keep the shearing speed unchanged, add viscosity-increasing components, Continue shearing for 3 minutes; increase the shearing speed to 5000r/min, add activated rubber powder, plasticizing components, and compatibilizing components, and continue high-speed shearing for 20 minutes; reduce the shearing speed to 3500r/min, add crosslinking components, Continue shearing for 30 minutes; control the temperature during the above shearing process between 185 and 190°C.

d) After the shearing process is completed, the sample is swelled and developed in an oven at 145° C. for 60 minutes; the sample is taken out from the oven and cooled to obtain the high-viscosity and high-elasticity asphalt based on the surface modification of rubber particles.

The performance indicators of the high-viscosity and high-elasticity asphalt based on the surface modification of rubber particles obtained in this embodiment are as described in Table 5:

Table 5 Example 2 Prepared high-viscosity and high-elasticity asphalt performance indicators based on surface modification of rubber particles

Test items unit Indicator requirements technical indicators Softening Point ℃ ≥90 92.2 5°C Ductility cm ≥40 60.1 Elastic recovery at 25°C % ≥95 99.3 Viscosity N·m ≥25 32.5 Viscosity at 60°C Pa·s ≥70000 91600

2) High viscosity and high elasticity SMA asphalt mixture

The high-viscosity and high-elasticity asphalt based on the surface modification of rubber particles prepared above is applied to the preparation of asphalt mixture, and the high-viscosity and high-elasticity asphalt mixture is composed of coarse aggregate (basalt aggregate, crushing value 6.9%), Fine aggregate (basalt aggregate), filler (mineral powder obtained by grinding strong basic rock in magmatic rock), fiber (polyester fiber), high-viscosity and high-elasticity asphalt (high viscosity and high asphalt) and viscosity control component (sulfonated polystyrene) as raw materials, the specific preparation steps are as follows:

a) by coarse aggregate: fine aggregate: filler: fiber: high-viscosity high-elasticity asphalt: viscosity control component=75:14.5:11.8:0.2:6.0:6.2 mass ratio takes each raw material, and coarse aggregate, The synthetic gradation of fine aggregates and fillers meets the requirements in Table 6.

b) First, heat coarse aggregate and fine aggregate in an oven at 190°C for 5 hours, and heat high-viscosity and high-elasticity asphalt in an oven at 170°C for 3 hours; then, add coarse aggregate, fine aggregate, and high-viscosity asphalt in sequence. Add high-elastic asphalt, fillers, fibers, and viscosity control components into a stirring pot at 160°C, stir for 180s, take out the high-viscosity and high-elasticity SMA asphalt mixture, and then roll it at 170°C to obtain high-viscosity and high-elasticity SMA asphalt concrete.

The synthetic gradation of the high-viscosity and high-elasticity SMA asphalt concrete prepared in this example is shown in Table 6, and its performance indicators are shown in Table 7.

Table 6 The gradation range of the high-viscosity and high-elasticity SMA asphalt mixture described in Example 2

Table 7 Performance indicators of the high-viscosity and high-elasticity SMA asphalt mixture obtained in Example 2

performance parameter unit Indicator requirements technical indicators porosity % 3～4 3.2 Dynamic stability at 60°C times/mm >8000 9501 Water immersion residual stability % ≥90 93.0 freeze-thaw splitting strength ratio % ≥85 92.2 Maximum bending and tensile strain at low temperature με ≥3000 3650

Example 3

1) High-viscosity and high-elasticity asphalt

A high-viscosity and high-elasticity asphalt based on the surface modification of rubber particles, with base asphalt, activated rubber powder, weather-resistant components, tackifying components (rosin resin), plasticizing components (dibutyl phthalate), The compatibilization component (minus third-line extraction oil) and cross-linking component (sulfur) are prepared as raw materials, and the specific preparation steps are as follows:

a) Preparation of activated rubber powder: Weigh the raw materials according to the mass ratio of rubber powder (80 mesh bias tire vulcanized rubber powder) and surface active component to 100:30; first, stir the rubber powder in a stirring pot at 55°C for 60 seconds; Then, add surface active component in three stages, the amount that adds for the first time is 10% of total amount (surface active component total mass), stirs 5min, the amount that adds for the second time is 20% of total amount, stirs 5min, the amount added for the third time was 70% of the total amount, and stirred for 20min; finally, the heating device of the stirring pot was turned off, and the temperature of the stirring pot was reduced to room temperature. During this process, the stirring was continued for 60min to obtain the surface-activated rubber powder .

b) According to the mass ratio of matrix asphalt:activated rubber powder:weathering component:tackifying component:plasticizing component:compatibilizing component:crosslinking component=100:20:4.2:3.0:3.0:4.6:0.2 Weigh each raw material.

c) Heat the base asphalt to 165°C, and turn on the high-speed shearing machine; gradually increase the speed to 3000r/min, add weather-resistant components, and continue shearing for 10 minutes; keep the shearing speed unchanged, and add viscosity-increasing components, Continue shearing for 4 minutes; increase the shearing speed to 6000r/min, add activated rubber powder, plasticizing components, and compatibilizing components, and continue high-speed shearing for 40 minutes; reduce the shearing speed to 3500r/min, add crosslinking components, Continue shearing for 40 minutes; control the temperature during the above shearing process between 185 and 195°C.

d) After the shearing process is completed, the sample is swollen and developed in an oven at 135° C. for 50 minutes; the sample is taken out from the oven and cooled to obtain the high-viscosity and high-elasticity asphalt based on the surface modification of rubber particles.

The performance indicators of the high-viscosity and high-elasticity asphalt based on the surface modification of rubber particles obtained in this embodiment are as described in Table 8:

Table 8 Performance indicators of high-viscosity and high-elasticity asphalt based on surface modification of rubber particles prepared in Example 3

performance parameter unit Indicator requirements technical indicators Softening Point ℃ ≥90 92.2 5°C Ductility cm ≥40 59.9 Elastic recovery at 25°C % ≥95 99.0 Viscosity N·m ≥25 32.4 Viscosity at 60°C Pa·s ≥70000 92250

2) High viscosity and high elasticity SMA asphalt mixture

The above-mentioned high-viscosity and high-elasticity asphalt based on the surface modification of rubber particles is applied to the preparation of asphalt mixture. ), fine aggregate (diabase aggregate), filler (mineral powder obtained by grinding strong basic rock in magmatic rock), fiber (polyester fiber), high-viscosity and high-elasticity asphalt (based on surface modification of rubber particles High-viscosity and high-elasticity asphalt) and viscosity control components (sulfonated polystyrene) are prepared as raw materials, and the specific preparation steps are as follows:

a) by coarse aggregate: fine aggregate: filler: fiber: high-viscosity high-elasticity asphalt: viscosity control component=75:15:8.1:0.4:6.5:10 mass ratio takes each raw material, and coarse aggregate, The synthetic gradation of fine aggregates and fillers meets the requirements in Table 9.

b) First, heat coarse aggregate and fine aggregate in an oven at 200°C for 6 hours, and heat high-viscosity and high-elasticity asphalt in an oven at 160°C for 3 hours; then, add coarse aggregate, fine aggregate, high-viscosity asphalt in sequence Add high-elastic asphalt, fillers, fibers, and viscosity control components into a stirring pot at 160°C, stir for 100 seconds, take out the high-viscosity, high-elasticity SMA asphalt mixture, and then roll it at 160°C to obtain high-viscosity, high-elasticity SMA asphalt mixture SMA asphalt concrete.

The synthetic gradation of the high-viscosity and high-elasticity SMA asphalt concrete prepared in this example is shown in Table 9, and its performance indicators are shown in Table 10.

Table 9 The gradation range of the high-viscosity and high-elasticity SMA asphalt mixture described in Example 3

Table 10 Performance indicators of the high-viscosity and high-elasticity SMA asphalt mixture obtained in Example 3

performance parameter unit Indicator requirements technical indicators porosity % 3～4 3.3 Dynamic stability at 60°C times/mm >8000 9494 Water immersion residual stability % ≥90 92.8 freeze-thaw splitting strength ratio % ≥85 93.1 Maximum bending and tensile strain at low temperature με ≥3000 3508

Example 4

1) High-viscosity and high-elasticity asphalt

A kind of high-viscosity and high-elasticity asphalt based on the surface modification of rubber particles, with base asphalt, activated rubber powder, weather-resistant components, tackifying components (C9 petroleum resin), plasticizing components (dioctyl phthalate) , the compatibilizing component (the mixture of furfural extracted oil and the third-line extracted oil, the mass ratio is 100:30) and the crosslinking component (dicumyl peroxide) are prepared as raw materials, and the specific preparation steps are as follows:

a) Preparation of activated rubber powder: take the raw materials by weighing the raw materials according to the mass ratio of rubber powder (80 mesh bias tire vulcanized rubber powder) and surface activation component (aromatic rubber oil); Stir in the stirring pot for 120s; then, add the surface active component in three stages, the amount of adding for the first time is 40% of the total amount (the total mass of the surface active component), stir for 15min, the amount of adding for the second time is the total 30% of the total amount, stirred for 10 minutes, the amount added for the third time was 30% of the total amount, stirred for 20 minutes; finally, the heating device of the stirring pot was turned off, and the temperature of the stirring pot was lowered to room temperature, and the stirring was continued for 30 minutes during this process to obtain The surface activated rubber powder.

b) According to the mass ratio of base asphalt:activated rubber powder:weathering component:tackifying component:plasticizing component:compatibilizing component:crosslinking component=100:16:5.8:3.8:1.0:1.2:0.6 Weigh each raw material.

c) Heat the base asphalt to 170°C, and turn on the high-speed shearing machine; gradually increase the speed to 2000r/min, add weather-resistant components, and continue shearing for 20 minutes; keep the shearing speed unchanged, and add viscosity-increasing components, Continue shearing for 3 minutes; increase the shearing speed to 5000r/min, add activated rubber powder, plasticizing components, and compatibilizing components, and continue high-speed shearing for 20 minutes; reduce the shearing speed to 3500r/min, add crosslinking components, Continue shearing for 20 minutes; control the temperature during the above shearing process between 190 and 200°C.

d) After the shearing process is completed, the sample is swollen and developed in an oven at 145° C. for 30 minutes; the sample is taken out from the oven and cooled to obtain the high-viscosity and high-elasticity asphalt based on the surface modification of rubber particles.

The performance indicators of the high-viscosity and high-elasticity asphalt based on the surface modification of rubber particles obtained in this embodiment are as described in Table 11:

Table 11 Performance indicators of high-viscosity and high-elasticity asphalt based on surface modification of rubber particles prepared in Example 4

Test items unit Indicator requirements technical indicators

Softening Point ℃ ≥90 92.7 5°C Ductility cm ≥40 59.8 Elastic recovery at 25°C % ≥95 99.3 Viscosity N·m ≥25 32.2 Viscosity at 60°C Pa·s ≥70000 92400

2) High viscosity and high elasticity SMA asphalt mixture

The above-mentioned high-viscosity and high-elasticity asphalt based on the surface modification of rubber particles is applied to the preparation of asphalt mixture. ), fine aggregate (diabase aggregate), filler (limestone powder), fiber (polyacrylonitrile fiber), high-viscosity and high-elasticity asphalt (high-viscosity and high-elasticity asphalt based on surface modification of rubber particles) and viscosity control The component (sodium aluminosilicate) is prepared as a raw material, and the specific preparation steps are as follows:

a) by coarse aggregate: fine aggregate: filler: fiber: high-viscosity high-elasticity asphalt: viscosity control component=75:13:12:0.4:6.2:6.0 mass ratio takes each raw material, and coarse aggregate, The synthetic gradation of fine aggregates and fillers meets the requirements in Table 12.

b) First, heat coarse aggregate and fine aggregate in an oven at 195°C for 8 hours, and heat high-viscosity and high-elasticity asphalt in an oven at 170°C for 3 hours; then, add coarse aggregate, fine aggregate, and high-viscosity asphalt in sequence. Add high-elastic asphalt, fillers, fibers, and viscosity control components into a stirring pot at 170°C, stir for 90 seconds, take out the high-viscosity and high-elasticity SMA asphalt mixture, and then roll it at 170°C to obtain high-viscosity and high-elasticity SMA asphalt concrete.

The synthetic gradation of the high-viscosity and high-elasticity SMA asphalt concrete prepared in this example is shown in Table 12, and its performance indicators are shown in Table 13.

Table 12 The gradation range of the high-viscosity and high-elasticity SMA asphalt mixture described in Example 4

Table 13 Performance indicators of the high-viscosity and high-elasticity SMA asphalt mixture obtained in Example 4

performance parameter unit Indicator requirements technical indicators porosity % 3～4 3.4 Dynamic stability at 60°C times/mm >8000 9379 Water immersion residual stability % ≥90 92.2 freeze-thaw splitting strength ratio % ≥85 92.7 Maximum bending and tensile strain at low temperature με ≥3000 3587

Example 5

1) High-viscosity and high-elasticity asphalt

A kind of high-viscosity high-elasticity asphalt based on the surface modification of rubber particles, with base asphalt, activated rubber powder, weather-resistant component, tackifying component (in C5 petroleum resin), plasticizing component (dioctyl phthalate Grease), compatibilizing component (aromatic oil) and crosslinking component (sulfur) are prepared as raw materials, and the specific preparation steps are as follows:

a) Preparation of activated rubber powder: Weigh the raw materials according to the mass ratio of rubber powder (80 mesh bias tire vulcanized rubber powder) and surface activation component to 100:12; first, stir the rubber powder in a stirring pot at 60°C for 30s; Then, add surface active component in three stages, the amount that adds for the first time is 20% of total amount (surface active component total mass), stirs 10min, the amount that adds for the second time is 50% of total amount, stirs 15min, the third added amount is 30% of the total amount, stirring for 20min; finally, turn off the heating device of the stirring pot to reduce the temperature of the stirring pot to room temperature, and continue stirring for 30min during this process to obtain the surface activated rubber powder .

b) According to the mass ratio of base asphalt:activated rubber powder:weathering component:tackifying component:plasticizing component:compatibilizing component:crosslinking component=100:15:6.0:2.0:1.5:4.8:0.1 Weigh each raw material.

c) Heat the base asphalt to 165°C, and turn on the high-speed shearing machine; gradually increase the rotational speed to 2000r/min, add weather-resistant components, and continue shearing for 10 minutes; keep the shearing speed unchanged, and add viscosity-increasing components, Continue shearing for 5 minutes; increase the shearing speed to 6000r/min, add activated rubber powder, plasticizing components, and compatibilizing components, and continue high-speed shearing for 40 minutes; reduce the shearing speed to 3000r/min, add crosslinking components, Continue shearing for 40 minutes; control the temperature during the above shearing process between 185 and 190°C.

d) After the shearing process is completed, the sample is swollen and developed in an oven at 140° C. for 30 minutes; the sample is taken out from the oven and cooled to obtain the high-viscosity and high-elasticity asphalt based on the surface modification of rubber particles.

The performance indicators of the high-viscosity and high-elasticity asphalt based on the surface modification of rubber particles prepared in this embodiment are as described in Table 14:

Table 14 The performance index of the high-viscosity and high-elasticity asphalt based on the surface modification of rubber particles prepared in Example 5

Test items unit Indicator requirements technical indicators Softening Point ℃ ≥90 92.6 5°C Ductility cm ≥40 60.1 Elastic recovery at 25°C % ≥95 98.8 Viscosity N·m ≥25 32.2 Viscosity at 60°C Pa·s ≥70000 92700

2) High viscosity and high elasticity SMA asphalt mixture

The above-mentioned high-viscosity and high-elasticity asphalt based on the surface modification of rubber particles is applied to the preparation of asphalt mixture. ), fine aggregate (basalt aggregate), filler (mineral powder obtained by grinding strong mafic rock in magmatic rock), fiber (polyester fiber), high viscosity and high elastic asphalt (high viscoelastic asphalt) and viscosity control component (sodium aluminosilicate) as raw materials, the specific preparation steps are as follows:

a) by coarse aggregate: fine aggregate: filler: fiber: high-viscosity high-elasticity asphalt: viscosity control component=75:10.3:10.5:0.4:6.4:8.3 mass ratio takes each raw material, and coarse aggregate, The synthetic gradation of fine aggregates and fillers meets the requirements in Table 15.

b) First, heat coarse aggregate and fine aggregate in an oven at 190°C for 5 hours, and heat high-viscosity and high-elasticity asphalt in an oven at 165°C for 3.5 hours; then, add coarse aggregate, fine aggregate, high Add viscous and high-elasticity asphalt, fillers, fibers, and viscosity control components into a stirring pot at 160°C, stir for 120s, take out the high-viscosity and high-elasticity SMA asphalt mixture, and then roll it at 160°C to obtain a high-viscosity and high-elasticity SMA asphalt mixture. Playing SMA asphalt concrete.

The synthetic gradation of the high-viscosity and high-elasticity SMA asphalt concrete prepared in this example is shown in Table 15, and its performance indicators are shown in Table 16.

Table 15 The gradation range of the high-viscosity and high-elasticity SMA asphalt mixture described in Example 5

Table 16 Performance indicators of the high-viscosity and high-elasticity SMA asphalt mixture obtained in Example 5

performance parameter unit Indicator requirements technical indicators porosity % 3～4 3.6 Dynamic stability at 60°C times/mm >8000 9258 Water immersion residual stability % ≥90 92.6 freeze-thaw splitting strength ratio % ≥85 92.9 Maximum bending and tensile strain at low temperature με ≥3000 3678

The above results show that the viscoelastic properties of the high-viscosity and high-elasticity asphalt prepared by rubber powder surface activation technology are improved and the temperature sensitivity is reduced. Excellent crack resistance, with significant technological advancement and innovation.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the creative concept of the present invention, some improvements and changes are made, and these all belong to the protection of the present invention. scope.

Claims (10)

1. the high-viscosity high-elasticity asphalt based on rubber particle surface modification, it is characterized in that, it is with matrix pitch, activating rubber powder, weather-proof component, adhesion promoting component, plasticizing component, increase-volume component and linked for raw material is prepared from, and the mass ratio between each component is: matrix pitch: activating rubber powder: weather-proof component: adhesion promoting component: plasticizing component: increase-volume component: linked=100:(15 ~ 20): (4 ~ 6): (2 ~ 4): (1 ~ 3): (1 ~ 5): (0.1 ~ 1).

2. high-viscosity high-elasticity asphalt according to claim 1, it is characterized in that, described activating rubber powder by rubber powder and surface active component with 100:(5 ~ 30) mass ratio form through surface active, concrete preparation process is: rubber powder is stirred 30 ~ 120s at 40 ~ 60 DEG C; Then divide three times and add surface active component, each add-on is 10 ~ 70% of surface active component total mass, each stirring 5 ~ 20min, the amount added depends on and flows down without too much surface active component at the bottom of agitator kettle, and rubber grain is without the agglomerating phenomenon of serious bonding simultaneously; Finally be cooled to room temperature, after this phase lasts stirs 30 ~ 60min, obtain described activating rubber powder.

3. high-viscosity high-elasticity asphalt according to claim 2, is characterized in that, described rubber powder is 40 orders or 80 order bias tire vulcanized rubber powders; Surface active component is aromatic base rubber oil, one or more in naphthenic rubber oil & fat hydrocarbon solvent oil mix in any proportion.

4. high-viscosity high-elasticity asphalt according to claim 2, is characterized in that, described matrix pitch is that 70# or 90# heavily hands over petroleum pitch; Weather-proof component is line style styrene-butadiene-styrene block copolymer; Adhesion promoting component is note olefine resin, one or more in Gum Rosin, C9 petroleum resin and C5 petroleum resin mix in any proportion; Plasticizing component is for facing phthalic acid dibutyl ester or facing phthalic acid dibutyl ester; Increase-volume component is furfural extract oil, second line of distillation extracts oil out, subtract one or more of extracting out in oil and aromatic hydrocarbon oil of three lines mixes in any proportion; Linked is sulphur or dicumyl peroxide.

5. the high-viscosity high-elasticity asphalt preparation method based on rubber particle surface modification described in any one of Claims 1 to 4, it is characterized in that, comprise the following steps: 1) by matrix pitch: activating rubber powder: weather-proof component: adhesion promoting component: plasticizing component: increase-volume component: linked=100:(15 ~ 20): (4 ~ 6): (2 ~ 4): (1 ~ 3): (1 ~ 5): the mass ratio of (0.1 ~ 1) takes each raw material; 2) matrix pitch is heated to 160 ~ 170 DEG C, opens high-speed shearing machine; Gradually rotating speed is promoted to 2000 ~ 3000r/min, then adds weather-proof component, continue shearing 10 ~ 20min; Keep shearing rotating speed constant, add adhesion promoting component, continue shearing 3 ~ 5min; Then promote velocity of shear to 5000 ~ 6000r/min, add activating rubber powder, plasticizing component, increase-volume component, continue high speed shear 20 ~ 40min; Reduce velocity of shear to 3000 ~ 4000r/min, add linked, continue shearing 20 ~ 40min; Above shear history control temperature is between 185 ~ 200 DEG C; 3) after shear history completes, by sample as growth 30 ~ 60min swelling in the baking oven of 135 ~ 145 DEG C; The high-viscosity high-elasticity asphalt cooling described.

6. the high-viscosity high-elasticity SAM asphalt based on rubber particle surface modification, it is characterized in that, it is with coarse aggregate, fine aggregate, filler, fiber, high-viscosity high-elasticity asphalt and viscosity regulation component for raw material, and the mass ratio between each component is: coarse aggregate: fine aggregate: filler: fiber: high-viscosity high-elasticity asphalt: viscosity regulation component=75:(10 ~ 15): (8 ~ 12): (0.2 ~ 0.4): (6.0 ~ 6.5): (6 ~ 10).

7. high-viscosity high-elasticity asphalt compound according to claim 6, is characterized in that, described viscosity regulation component is sodium silicoaluminate or sulphonated polystyrene.

8. high-viscosity high-elasticity SAM asphalt according to claim 6, is characterized in that, described high-viscosity high-elasticity asphalt is the high-viscosity high-elasticity asphalt based on rubber particle surface modification; Coarse aggregate is that basalt or diabase gather materials, crush values < 10%; Fine aggregate is that limestone, basalt or diabase gather materials; Filler is the levigate breeze obtained of strong subsiliceous rock in limestone mineral powder or magmatite; Fiber is polyacrylonitrile fibre or trevira.

9. high-viscosity high-elasticity SAM asphalt according to claim 6, it is characterized in that, in the formate gradation composition scope of described coarse aggregate, fine aggregate, filler, sieve aperture percent of pass mainly comprises: the 13.2mm sieve aperture 88 ~ 100% of SMA-13,4.75mm sieve aperture 20 ~ 26%, 2.36mm sieve aperture 16 ~ 22,0.075mm sieve aperture 10 ~ 12%; 16mm sieve aperture 88 ~ 100%, 4.75mm sieve aperture 20 ~ 24%, 2.36mm sieve aperture 15 ~ 20, the 0.075mm sieve aperture 10 ~ 12% of SMA-16.

10. the preparation method of the high-viscosity high-elasticity SAM asphalt based on rubber particle surface modification described in any one of claim 6 ~ 9, it is characterized in that, comprise the following steps: 1) by coarse aggregate: fine aggregate: filler: fiber: high-viscosity high-elasticity asphalt: viscosity regulation component=75:(10 ~ 15): (8 ~ 12): (0.2 ~ 0.4): (6.0 ~ 6.5): the mass ratio of (6 ~ 10) takes each raw material; 2) coarse aggregate, fine aggregate are heated 5 ~ 8h at 190 ~ 200 DEG C, high-viscosity high-elasticity asphalt is heated 3 ~ 4h at 160 ~ 170 DEG C; 3) add coarse aggregate, fine aggregate, high-viscosity high-elasticity asphalt, filler, fiber and viscosity regulation component successively, and stir 90 ~ 180s at 160 ~ 170 DEG C, obtain described high-viscosity high-elasticity SMA asphalt; Then roller-compaction at 160 ~ 170 DEG C, obtains described high-viscosity high-elasticity SMA bituminous concrete.