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Method for preparing composite modified rubber asphalt mixture

A technology of rubberized asphalt and compound modification, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc. Satisfactory and other problems, to achieve the effect of improving high temperature performance

Active Publication Date: 2009-06-17
广州大象超薄路面技术开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Due to the limitation of material selection and other factors, the rubber asphalt mixture prepared by the above method is still unsatisfactory in terms of adhesion performance and high temperature performance.
The main reason for the lack of adhesion performance is that rubber asphalt has added more than 15% of rubber powder, resulting in too thick asphalt, so it is difficult to coat the surface of stone materials; the main reason for poor high temperature performance is that the adhesion performance of rubber asphalt and stone materials is reduced After that, the high temperature performance will be reduced. In addition, the asphalt content added to the rubber asphalt mixture is relatively high, which is about 50% higher than that of ordinary asphalt mixture. The mixture corresponding to the higher asphalt content has poor high temperature performance.
If modifiers are added to the rubber asphalt, the viscosity of the rubber asphalt will be higher. Although there is a patent to add it through the dry method, it will still increase the construction difficulty of the rubber asphalt mixture.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0028] Prepare high-viscosity asphalt modifier by the formula of table 1 weight part:

[0029] Raw material source:

[0030] SIS: produced by Kraton Company, model Kraton D-1161, the product specifications are as follows:

[0031] Specification D-1161 proportion 0.92 Melt index (a) g / 10min 12 hardness Shoe A 37 300% modulus psi 130 Tensile Strength psi 3100 Elongation ％ 1300 Solution viscosity (b) cps 1200 oil content ％ 0

[0032] Styrene content ％ 15 Diblock content ％ 19

[0033] Coumarone resin: produced by Henan Anyang Jinmaoxiang Company, with a softening point of 100°C

[0034] Oleic acid amide: produced by Jiangxi Weike Oleochemical Co., Ltd., the main indicators are as follows:

[0035] acid value

[0036] SBS: Produced by South Korean LG company, the model is LG-501

[0037] C5 pe...

Embodiment 6

[0046] Prepare rubber asphalt mixture as follows:

[0047] 1. Add 15% tire rubber powder to 85% road petroleum asphalt (No. 70 road petroleum asphalt) based on the mass percentage of rubber asphalt, and stir and react for 45 minutes at 180°C to make rubber asphalt ;

[0048] 2. Heat 100 parts by weight of stone in mineral aggregates to 160°C, add 0.2 parts by weight of modifier, and stir evenly;

[0049] 3. Add 6 parts by weight of the rubber asphalt obtained in step 1 to the mixture obtained in step 2, and stir evenly to obtain a finished composite modified rubber asphalt mixture.

[0050] The stone in the above step 2 meets the following gradation requirements:

[0051] mesh size 16.0 13.2 9.5 4.75 2.36 0.075 intermittent grading 100 80 55 25 14 0

Embodiment 7

[0060] Prepare rubber asphalt mixture as follows:

[0061] 1. Add 23% of tire rubber powder to 77% of road petroleum asphalt based on the mass percentage of rubber asphalt, and stir and react for 45 minutes at 200°C to make rubber asphalt;

[0062] 2. Heat 100 parts by weight of stone in mineral aggregates to 200°C, add 0.5 parts by weight of modifier, and stir evenly;

[0063] 3. Add 10 parts by weight of the asphalt rubber obtained in step 1 to the mixture obtained in step 2, and stir evenly to obtain a finished compound modified asphalt rubber mixture.

[0064] The stone meets the following gradation requirements:

[0065] mesh size 16.0 13.2 9.5 4.75 2.36 0.075 intermittent grading 100 100 80 42 28 3

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PUM

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Abstract

The invention discloses a method for preparing a composite modified rubber asphalt mixture, which comprises the following steps: adding tire rubber powder into road petroleum asphalt to be made into rubber asphalt; adding SIS, coumarone indene resin and oleic acid amide into a screw extruder to carry out bracing and granulating so as to form modifying agent; and adding stone in mineral aggregate after heating into the modifying agent, stirring the mixture evenly and then adding the mixture into the rubber asphalt, and stirring the mixture evenly to obtain a finished product of the composite modified rubber asphalt mixture. The rubber asphalt mixture prepared by the method improves adhesiveness and workability of the product at the same time of ensuring high-temperature and low-temperature performances of the mixture.

Description

technical field [0001] The invention relates to a preparation method of modified rubber asphalt mixture. Background technique [0002] Rubber asphalt refers to the modified asphalt cementing material obtained by the reaction of tire rubber powder with a content of more than 15% under high temperature and sufficient mixing conditions and the swelling reaction of asphalt. Due to the use of recycled tires as the main material for modification, it has a cost advantage compared to styrene-butadiene block copolymer (SBS) modified asphalt, but rubber asphalt with pure tire rubber formula has poor performance in terms of high temperature stability and adhesion. , There are still deficiencies in the construction performance. [0003] In order to improve the overall performance of rubber asphalt, other modifiers can be added to rubber asphalt for modification. The existing technology of applying rubber powder to asphalt pavement is mainly divided into two categories: wet method and ...

Claims

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Application Information

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IPC IPC(8): C04B26/26C04B18/22C04B18/12
CPCY02W30/91
Inventor 黄卫东孙立军
Owner 广州大象超薄路面技术开发有限公司