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Composite modified asphalt based on SEBS and rubber powder and preparation method thereof

A technology of composite modified asphalt and rubber powder, which is applied in the direction of building components, building insulation materials, buildings, etc., can solve the problems of poor storage stability of modified asphalt, achieve excellent aging resistance and fatigue resistance, increase the service life of road surfaces, improve Effects of Stability and Heat Resistance

Inactive Publication Date: 2018-05-08
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a composite modified asphalt based on SEBS and rubber powder and its preparation method, which solves the defect of poor storage stability of modified asphalt under high temperature conditions in the traditional rubber powder modified asphalt system

Method used

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Examples

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Effect test

preparation example Construction

[0020] The present invention also provides a kind of preparation method of the composite modified asphalt based on SEBS and rubber powder, comprises the following steps:

[0021] Step 1. Preheat the base asphalt in an oven at 130°C for 2.5 hours;

[0022] Step 2. Continue heating the base asphalt preheated in step 1 to 160-170°C, and then add rubber powder and SEBS to it to obtain asphalt binder; wherein, the mass ratio of base asphalt, rubber powder and SEBS is 20: (1.6~3): 1, and manually stir and mix for 20 minutes;

[0023] Step 3, shearing the asphalt binder obtained in step 2 at a high speed at a temperature of 160-170° C. at a shear rate of 5000 rpm for 1 hour to obtain composite modified asphalt;

[0024] Step 4: put the uniformly sheared composite modified asphalt into an oven at 120° C. for swelling and development for 1 to 2 hours, and obtain the composite modified asphalt product based on SEBS and rubber powder of the present invention.

Embodiment 1

[0026] A kind of preparation method of the modified asphalt mixture based on SEBS and rubber powder is:

[0027] Step 1. Preheat SK90# base asphalt in an oven at 130°C;

[0028] Step 2. Continue heating the base asphalt preheated in step 1 to 170°C, and then add rubber powder and SEBS to it to obtain asphalt binder; wherein, the mass ratio of base asphalt, rubber powder and SEBS is 20:1.6: 1, and manually stir and mix for 20 minutes; wherein, the rubber powder is an odorless desulfurized rubber powder with a mesh size of 40 or more.

[0029] Step 3, shearing the asphalt binder obtained in step 2 at a high speed at a temperature of 170° C. at a shear rate of 5000 rpm for 1 hour to obtain composite modified asphalt;

[0030] Step 4: put the uniformly sheared composite modified asphalt into an oven at 120° C. for swelling and development for 1 hour, and obtain the composite modified asphalt product based on SEBS and rubber powder of the present invention.

Embodiment 2

[0032] A kind of preparation method of the modified asphalt mixture based on SEBS and rubber powder is:

[0033] Step 1. Preheat SK90# base asphalt in an oven at 130°C;

[0034] Step 2. Continue heating the base asphalt preheated in step 1 to 170°C, and then add rubber powder and SEBS to it to obtain asphalt binder; wherein, the mass ratio of base asphalt, rubber powder and SEBS is 20:2: 1, and manually stir and mix for 20 minutes; wherein, the rubber powder is an odorless desulfurized rubber powder with a mesh size of 40 or more.

[0035] Step 3, shearing the asphalt binder obtained in step 2 at a high speed at a temperature of 170° C. at a shear rate of 5000 rpm for 1 hour to obtain composite modified asphalt;

[0036] Step 4: put the uniformly sheared composite modified asphalt into an oven at 120° C. for swelling and development for 1 hour, and obtain the composite modified asphalt product based on SEBS and rubber powder of the present invention.

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PUM

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Abstract

The invention provides a composite modified asphalt based on SEBS and rubber powder and a preparation method thereof. The composite modified asphalt is prepared from the following components in partsby weight: 100 parts of No.90 base asphalt, 8 to 15 parts of rubber powder and 5 parts of SEBS. By adding the rubber powder, the viscosity and plasticity of the composite modified asphalt prepared bythe invention are increased, the stability and heat resistance of the modified asphalt are increased by adding the SEBS, and thereby the SEBS-modified asphalt has excellent properties, such as aging resistance and fatigue resistance; therefore, the composite modification effect of the SEBS and the rubber powder changes the physical properties, temperature sensitivity, cohesiveness and durability of the base asphalt material, increasing the high and low temperature properties and durable and stable properties of the asphalt; and when applied on a road, the composite modified asphalt can prolongthe service life of the pavement and reduce maintenance cost.

Description

technical field [0001] The invention belongs to the technical field of road building materials, and in particular relates to a composite modified asphalt based on SEBS and rubber powder and a preparation method thereof. Background technique [0002] More and more studies and applications have shown that rubber powder modified asphalt has many excellent properties, and the use of waste tires and other recycled rubber materials can improve the economy and environmental protection of rubber powder modified asphalt. In domestic highway engineering practice, rubber powder modified asphalt has been applied in many aspects. Practice has proved that rubber powder modified asphalt has excellent high temperature performance, good water stability, and good fatigue resistance. These properties are used in old It has wide applicability in road reconstruction and road overlaying projects. On the other hand, rubber powder modified asphalt is relatively easy to age, and the high temperatur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00C08L53/02C08L21/00
Inventor 马峰张耀冯乔林萌蕾侯仁辉傅珍
Owner CHANGAN UNIV
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