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Process for recycling asphalt from asphalt mixture

A technology of asphalt mixture and asphalt, which is applied in the direction of roads, road repairs, roads, etc., can solve the problems of asphalt aging, affecting the service performance and service life of recycled asphalt pavement, and design misleading, so as to save production costs, good promotion value, Avoid secondary aging effects

Inactive Publication Date: 2014-04-09
LIUZHOU BOZE SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the asphalt recycling process, various problems are highlighted, such as residual mineral powder and solvent in the recycled asphalt, aging of the asphalt during the testing process, etc. If the asphalt recovered from the asphalt mixture cannot reflect the true nature of the asphalt in the asphalt mixture performance, it will bring misleading to asphalt recycling and mixture design, and it will inevitably affect the service performance and service life of recycled asphalt pavement. craft is imminent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of asphalt recovery process in asphalt mixture, it is characterized in that, comprises the following steps:

[0026] (1) Impurity removal: remove the visible impurities in the asphalt mixture, and dry it for later use at a temperature of 120°C;

[0027] (2) Asphalt extraction: Cool the above-mentioned dry and standby asphalt mixture to 70°C, disperse it and soak it in industrial trichlorethylene solvent for 45min extraction; (3) Distillation and recovery of asphalt solution: Distill the above-mentioned Put the extracted liquid into the rotary flask, turn on the rotary flask and rotate at a speed of 40r / min for 5 min; turn on the vacuum pump to make the whole system form a negative pressure, and slowly place the bottom of the rotary flask in an oil bath at 50°C for distillation. After the cooled solution flows into the solvent recovery flask and reaches a steady state, gradually increase the rotation speed to 10000r / min, and increase the heating area of ​​the rota...

Embodiment 2

[0030] A kind of asphalt recovery process in asphalt mixture, it is characterized in that, comprises the following steps:

[0031] (1) Impurity removal: remove the visible impurities in the asphalt mixture, and dry it for later use at a temperature of 130°C;

[0032] (2) Asphalt extraction: Cool the above-mentioned dry and standby asphalt mixture to 75°C, disperse it and soak it in industrial trichlorethylene solvent for 50min extraction; (3) Distillation and recovery of asphalt solution: Distill the above-mentioned Put the extracted liquid into a rotary flask, turn on the rotary flask and rotate at a speed of 45 r / min for 8 min; turn on the vacuum pump to make the whole system form a negative pressure, and slowly place the bottom of the rotary flask in a 52 °C oil bath for distillation. After the solution cooled by the device flows into the solvent recovery flask and reaches a steady state, gradually increase the rotation speed to 11000r / min, and increase the heating area of ...

Embodiment 3

[0035] A kind of asphalt recovery process in asphalt mixture, it is characterized in that, comprises the following steps:

[0036] (1) Impurity removal: remove the visible impurities in the asphalt mixture, and dry it for later use at a temperature of 125°C;

[0037] (2) Asphalt extraction: Cool the above-mentioned dry and standby asphalt mixture to 75°C, disperse it and soak it in an industrial trichlorethylene solvent for 55 minutes of extraction; (3) Distillation and recovery of asphalt solution: Distill the above-mentioned Put the extracted liquid into a rotary flask, turn on the rotary flask and rotate at a speed of 50 r / min for 10 min; turn on the vacuum pump to make the whole system form a negative pressure, and slowly place the bottom of the rotary flask in a 55 °C oil bath for distillation. After the solution cooled by the device flows into the solvent recovery flask and reaches a steady state, gradually increase the rotation speed to 11500r / min, and increase the heat...

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Abstract

The invention discloses a process for recycling asphalt from an asphalt mixture. The process comprises three steps of impurities removal, asphalt extraction and distillation and recovery of an asphalt solution, and thus recovered asphalt can be obtained. An asphalt-trichloro ethylene solution is vacuumized to reduce pressure and heated to accelerate evaporation; the evaporated trichloro ethylene is condensed after being contacted with circulating water and enters a solvent-recovering bottle so as to be separated from the asphalt; a distilling flask is kept in a vacuum state, so that secondary ageing of the asphalt can be prevented; and the process is simple and practicable in steps and has very good popularization value.

Description

technical field [0001] The invention belongs to the technical field of highway asphalt pavement detection, and in particular relates to a process for recovering asphalt in asphalt mixture. Background technique [0002] With the development and vigorous promotion of asphalt regeneration technology, it has become a common test method to recover asphalt from asphalt pavement or asphalt mixture and perform performance testing. The test results obtained can be used to evaluate the aging of asphalt in petroleum asphalt mixture. degree, as well as the analysis of the damage causes of asphalt pavement, the regeneration of aged asphalt and the design of mixture ratio. However, in the asphalt recycling process, various problems are highlighted, such as residual mineral powder and solvent in the recycled asphalt, aging of the asphalt during the testing process, etc. If the asphalt recovered from the asphalt mixture cannot reflect the true nature of the asphalt in the asphalt mixture p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01C19/02E01C19/08
Inventor 罗永城梁剑林国友黄景明卢兰韦玲双梁山丹谢美萱徐国华卢颖
Owner LIUZHOU BOZE SCI & TECH
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