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A high modulus modified recycled asphalt mixture and its preparation method and application

A technology for recycled mixtures and asphalt mixtures, which is applied in the field of asphalt mixtures, can solve the problems that the recycled mixtures cannot rationally use asphalt modification methods, cannot effectively digest the accumulation of waste materials, and do not pay attention to organic combination, etc., to achieve Compensating for lack of fatigue performance, eliminating rutting, and prolonging durability

Active Publication Date: 2018-05-01
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Second, asphalt modification methods were not properly used in the design of recycled mixtures
The blending ratio of old materials in most engineering applications is less than 25%, which still cannot effectively digest the hoarding of waste materials
[0006] The third is that material design and structural design are often considered separately in the design of recycled pavement, and the organic combination of the two is not paid attention to.

Method used

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  • A high modulus modified recycled asphalt mixture and its preparation method and application
  • A high modulus modified recycled asphalt mixture and its preparation method and application
  • A high modulus modified recycled asphalt mixture and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The preparation method of high modulus modified recycled asphalt mixture of the present invention comprises the following steps:

[0025] (1) Preparation of composite modified asphalt: firstly heat No. 70 road asphalt to 135°C with ordinary road asphalt SK-70 and buton rock asphalt BLA, then add rock asphalt and keep stirring for 10 minutes, so that rock asphalt can be modified in the compound type Evenly distributed in the asphalt, then put the composite modified asphalt into an oven at 160°C and incubate for 1 hour, take it out and cut it at a high speed at 170°C for 15 minutes, and test the softening point. When it reaches 60°C, it represents the composite modified asphalt If the requirements are not met, continue to add rock asphalt to make it meet the requirements. In the obtained composite modified asphalt, ordinary road asphalt SK-70 accounts for 60wt%, but pontic asphalt BLA accounts for 40%, and its performance indicators are shown in Table 1.

[0026] Table 1...

Embodiment 2

[0037] The basic steps are the same as in Example 1, except that the recycled asphalt pavement material accounts for 50 wt% of the recycled mixture.

Embodiment 3

[0039] The basic steps are the same as in Example 1, except that the recycled asphalt pavement material accounts for 60 wt% of the recycled mixture.

[0040] The high modulus modified recycled asphalt mixture prepared in Examples 1 to 3 was tested for performance, and the obtained results are shown in Table 5 to Table 9.

[0041] Table 5 Dynamic modulus

[0042] performance

none

Example 1

Example 2

Example 3

Dynamic modulus (MPa)

21024

22181

22783

24605

[0043] Table 6 Dynamic stability

[0044] performance

none

Example 1

Example 2

Example 3

Dynamic stability (times / mm)

4627

4809

5337

6980

[0045] Table 7 Low temperature performance

[0046] performance

Bending tensile strength (MPa)

Maximum Bending and Tensile Strain (με)

Bending modulus of stiffness (MPa)

none

8.51

2587

3289

Example 1

9.5

1926

4932

Example 2

11...

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PUM

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Abstract

The invention discloses a high-modulus modified recycling bituminous mixture and a preparation method and application. The recycling bituminous mixture comprises 40-60 wt% of bituminous pavement recovered material and 40-60 wt% of new mixed bituminous mixture, and the new mixed bituminous mixture comprises compound modified bitumen and new mineral material. The compound modified bitumen comprises 55-65 wt% of road bitumen and 35-45 wt% of rock bitumen, and the total content of bitumen in the recycling mixture is 5-6 wt%. The preparation method of the modified recycling bituminous mixture includes stirring the new mineral material and bituminous pavement recovered material, adding compound modified bitumen, and stirring the mixture and performing moulding at specified temperature. The prepared recycling bituminous mixture fully performs the hardening characteristic of the bituminous pavement recovered material after aging, improves the high temperature property and dynamic modulus of the recycling bituminous mixture. Moreover, the preparation method of the recycling bituminous mixture is low carbon and environmentally friendly, and has good rutting resistance by using the designed recycling pavement structure.

Description

technical field [0001] The invention belongs to the field of asphalt mixture, and in particular relates to a high-modulus modified recycled asphalt mixture, a preparation method and application thereof. Background technique [0002] my country's highway construction has made unprecedented progress in the development process of nearly 20 years, and more than 90% of the highways use asphalt concrete pavement. Due to the huge amount of expressways, about 12% of the asphalt pavement in our country needs to be maintained and repaired every year, and the waste asphalt mixture produced by the renovation is as high as 2.2 million tons, and the number is growing at an annual rate of 15%. These waste asphalt mixtures still have utilization value. If they are discarded, it will not only take up a lot of land resources, but also cause immeasurable harm to the environment. The regeneration technology of asphalt mixture has made great progress since its birth. If the waste asphalt mixtur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L95/00C04B26/26C04B18/16
CPCC04B26/26C04B18/167C04B20/0076Y02W30/91
Inventor 黄晓明祝谭雍李伟邓交龙
Owner SOUTHEAST UNIV
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