Rubber powder modified asphalt mixture and preparation method thereof

A technology of asphalt mixture and modified asphalt, which is applied in the field of modified asphalt, can solve the problems that cannot accurately reflect the mechanical properties of asphalt mixture, and can not better correspond to the technical performance of asphalt pavement, so as to promote sustainable development and improve the road surface The effect of using performance and cost saving

Active Publication Date: 2018-06-01
中铁十八局集团第五工程有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large number of practices have proved that the entire index system of the traditional Marshall design method can neither accurately reflect the mechanical properties of asphalt mixture, nor can it better correspond to the technical performance of asphalt pavement.
Research results both at home and abroad show that there is a large gap between the volume index of Marshall design and the actual road performance index

Method used

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  • Rubber powder modified asphalt mixture and preparation method thereof
  • Rubber powder modified asphalt mixture and preparation method thereof
  • Rubber powder modified asphalt mixture and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0036] In the preparation method of rubber powder modified asphalt of the present invention, when the base asphalt is heated to the required temperature, the high-shear dispersing and emulsifying machine is started, and the rubber powder is evenly added while shearing, and stirred for a specified time and paying attention to the temperature of the stirring process The rubber powder modified asphalt samples can be prepared. The high-shear dispersing emulsifier used in the embodiments of the present invention is an open laboratory high-shear mixing emulsifier produced by Shanghai Shanggui Machinery Electronics Co., Ltd., and its principle is to shred and disperse rubber powder by high-speed shearing. Form rubber powder asphalt in asphalt. It can truly simulate the actual situation of producing rubber powder asphalt materials on the construction site. The agitator of the agitator used in the embodiment of the present invention is a screw agitator.

[0037] The preparation metho...

experiment example

[0047] When GTM forms the test piece, it effectively simulates the final compaction state of the asphalt mixture under the action of road traffic load: that is, the asphalt mixture test piece is continuously kneaded, sheared and compacted under the specified mechanical rotation angle and set vertical pressure , until the equilibrium state (refers to the density change rate of 0.016g / cm per 100 rotations of the specimen 3 ). During the forming process of the test piece, GTM can automatically collect the stress and strain data of the test piece, and display the change curve of the shear strength. The strain of the specimen is characterized by the size of the machine angle, and the shear strength SG is obtained by reasoning and converting the roller pressure.

[0048] The purpose of the GTM forming test is to simulate the final compaction state of the asphalt mixture under the action of road traffic load, that is, the equilibrium state, and test and analyze the shear strength an...

Embodiment 1

[0071] This embodiment provides a method for preparing rubber powder modified asphalt, comprising the following steps:

[0072] 1) Processing of raw materials: drying the rubber powder at a temperature of 105°C; dehydrating the base asphalt for later use;

[0073] 2) Miscibility reaction: heat the dehydrated base asphalt in step 1) to 180°C, then add the dried rubber powder in step 1) into the base asphalt, stir and swell for 42 minutes to obtain a mixed solution; mix the rubber powder When adding to the base asphalt, it must be added while stirring to prevent splashing and hurting people during the stirring process; when starting the mixer to stir, the stirring speed should be slow to fast, starting from 260-300r / min and stirring within 20 minutes The speed increased to 1000r / min, and finally stabilized at 1000r / min and stirred for 15 minutes, and the stirring temperature was controlled at 190°C to 210°C;

[0074] 3) Finished product: pump the mixed liquid in step 2) into th...

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Abstract

The invention discloses a rubber powder modified asphalt mixture and a preparation method thereof. The rubber powder modified asphalt mixture comprises coarse aggregate, fine aggregate, mineral powderand rubber powder modified asphalt, wherein the proportion of the rubber powder modified asphalt mixture is designed in a GTM method; and an oil-stone ratio of the asphalt mixture is 5.2 to 5.6 percent. The rubber powder modified asphalt is prepared from waste tire rubber powder and applied to the road construction, so that not only can the quality of the ordinary asphalt be effectively improved,and the pavement application performance be improved, but also the engineering construction cost can be reduced, and the project investment can be reduced. The rubber powder modified asphalt mixtureis designed on the basis of the GTM designing method, so that while the use amount of asphalt is reduced, the technical advantages of the material can be sufficiently played, the pavement performancecan be significantly improved, and the later maintenance expense can be reduced.

Description

technical field [0001] The invention relates to the field of modified asphalt, in particular to a rubber powder modified asphalt mixture and a preparation method thereof. Background technique [0002] With the development of the automobile industry and the rapid growth of social car ownership, the output of waste rubber in my country has increased sharply in recent years. At present, there are two main methods of recycling and comprehensive utilization of rubber: incineration to generate heat and production of recycled rubber. However, for burning rubber, it will cause secondary pollution to the air during the burning process. Considering the need to protect the environment, the treatment methods for this waste rubber have been gradually reduced; in addition, for the production of recycled rubber, due to the poor quality of the produced recycled rubber, The production process has high pollution and high energy consumption, and the current output of reclaimed rubber is gradu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B26/26C04B111/27
CPCC04B26/26C04B2111/00293C04B2111/00362C04B2111/0075C04B2111/27C04B2201/20C04B18/22C04B14/14C04B14/28C04B14/06C04B18/12C04B20/0076
Inventor 李晓林周晓辉王海军郭金柱张弛
Owner 中铁十八局集团第五工程有限公司
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