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Composite modified asphalt and preparation method thereof

A technology of compound modified asphalt and modified asphalt, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the application limitation, reduce the high and low temperature performance of rubber asphalt, and the high price of SBS

Active Publication Date: 2021-06-04
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, waste tire rubber powder will be vulcanized before use, so the rubber powder has good thermal stability and poor surface activity, and it is difficult to chemically react with asphalt
[0003] On the one hand, studies have shown that the surface roughness and activity of rubber powder can be improved by activating rubber powder, so as to improve the compatibility between rubber powder and asphalt, reduce the viscosity of rubber asphalt, and improve its workability; However, this method will reduce the high and low temperature performance of rubber asphalt
On the other hand, SBS is a widely used and mature road asphalt modifier, which can significantly improve the high and low temperature performance of asphalt pavement at the same time; but the high price of SBS limits its application

Method used

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  • Composite modified asphalt and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0031] The preparation method of composite modified asphalt is carried out according to the following steps:

[0032] Step 1, weighing each raw material respectively according to the mass proportion of the raw materials;

[0033] Step 2: Put the base asphalt in an oven at 140°C to 160°C and heat it to a fluid state, take it out and put it on the heating equipment, and add SBS, stabilizer and anti-aging agent. Within 5 minutes after the addition is completed, raise the temperature to 165°C-175°C and keep it for 25min-30min;

[0034] Step 3. Put the evenly stirred asphalt into an oven at 170°C to 180°C to swell for 30min to 40min;

[0035] Step 4. Move the swollen asphalt to the high-speed shearing equipment, gradually increase the shear rate to about 4000r / min-4500r / min, control the temperature at 175°C-185°C, and take it out after cutting for 45min-60min;

[0036] Step 5. Put the sheared SBS modified asphalt in an oven at 170°C to 180°C for 30min to 40min;

[0037] Step 6....

Embodiment 1

[0082] Example 1: Composite Modified Asphalt

[0083] The composite modified asphalt given in this example consists of the following raw materials in terms of mass fraction: 80 parts of base asphalt, 17 parts of RVS / PTC-R activated rubber powder, 2 parts of SBS, 0.5 part of stabilizer and 0.5 part of antiaging agent .

[0084] The preparation method of the above-mentioned composite modified asphalt is carried out according to the following steps:

[0085] Step 1, weighing each raw material respectively according to the mass proportion of the raw materials;

[0086] Step 2: Put the base asphalt in an oven at 150°C and heat it to a fluid state, take it out and put it on the heating equipment, and add SBS, stabilizer and anti-aging agent in sequence under stirring at 350r / min. Increase the temperature to 165°C within 5 minutes after the addition is complete and keep it for 27 minutes;

[0087] Step 3. Put the evenly stirred asphalt into an oven at 175°C to swell for 32 minutes...

Embodiment 2

[0098] Embodiment 2: composite modified asphalt

[0099] The difference between this embodiment and the above-mentioned embodiment 1 lies in the ratio of each raw material. The composite modified asphalt given in this example is composed of the following raw materials in terms of mass fraction: 82 parts of base asphalt, 15 parts of RVS / PTC-R activated rubber powder, 2 parts of SBS, 0.5 part of stabilizer and 0.5 part of antiaging agent .

[0100] The preparation method of the above-mentioned composite modified asphalt is carried out according to the following steps:

[0101] Step 1, weighing each raw material respectively according to the mass proportion of the raw materials;

[0102] Step 2: Heat the base asphalt in an oven at 160°C to a fluid state, take it out and place it on a heating device, and add SBS, stabilizer and anti-aging agent in sequence under stirring at 320r / min. Within 5 minutes after the addition is completed, the temperature is raised to 170°C and maintain...

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Abstract

The invention discloses composite modified asphalt and a preparation method thereof. The preparation method comprises the following steps: 1, preparing SBS modified asphalt; 2, stirring the SBS modified asphalt at the temperature of 300r / min to 400r / min, adding the RVS / PTC-R activated rubber powder, raising the temperature to 165 DEG C to 175 DEG C within 5min after the SBS modified asphalt is added, and keeping the temperature for 20min to 30min; 3, shearing a product obtained in the step 2, gradually increasing the shearing rate to 4000 r / min to 4500 r / min, controlling the temperature to be 180 DEG C to 190 DEG C, conducting shearing for 45 min to 60 min, and taking out a sheared product; and 4, developing the product obtained in the step 3 at the temperature of 175-185 DEG C for 30-40 minutes to obtain the composite modified asphalt. The composite modified asphalt has good high and low temperature performance, and also has excellent storage stability and construction workability.

Description

technical field [0001] The invention belongs to the field of road building materials, and relates to a composite modified asphalt and a preparation method thereof. Background technique [0002] In recent years, with the promotion of industrial production of rubber powder and the in-depth research on pavement structure, waste tire rubber powder, as a new type of asphalt modifier, has excellent high-temperature anti-rutting, low-temperature anti-cracking, good durability, and reduces road surface Noise, and a series of environmental protection meanings such as effective recycling of waste tire resources, have been widely used in road construction. However, waste tire rubber powder will be vulcanized before use, so the rubber powder has good thermal stability and poor surface activity, and it is difficult to chemically react with asphalt. [0003] On the one hand, studies have shown that the surface roughness and activity of rubber powder can be improved by activating rubber p...

Claims

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Application Information

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IPC IPC(8): C08L95/00C08L53/02C08L7/00
CPCC08L95/00C08L2205/035C08L2205/025C08L53/02C08L7/00Y02W30/91
Inventor 况栋梁康秉铎张洪刚王彬刘文昌王雪婷伍思豫
Owner CHANGAN UNIV
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