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Device and method for layering stripping of aged asphalt on surface of recycled asphalt pavement material

A technology for pavement materials and recycled asphalt, applied in the field of asphalt recycling, can solve the problems of inability to carry out accurate analysis, neglecting different aging degrees, etc., and achieve the effects of being conducive to accurate analysis, convenient use and easy evaluation

Inactive Publication Date: 2015-11-25
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods can provide technical means for evaluating aged asphalt, they all extract the asphalt on the RAP as a whole, ignoring the different aging degrees of the aged asphalt on the RAP from the outside to the inside, and cannot perform accurate analysis

Method used

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  • Device and method for layering stripping of aged asphalt on surface of recycled asphalt pavement material
  • Device and method for layering stripping of aged asphalt on surface of recycled asphalt pavement material
  • Device and method for layering stripping of aged asphalt on surface of recycled asphalt pavement material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] This embodiment tests the RAP surface aging of the asphalt mixture of 70# petroleum asphalt (penetration (25°C, 5s, 100g) is 6.3mm, softening point is 52.3°C, ductility at 25°C is 142cm) after 4 years of use Three major performance changes of asphalt from outside to inside:

[0044] The first step: place the recycled asphalt pavement (RAP) on the support frame 4 of the container 1, inject trichlorethylene into the container 1, adjust the amount of solvent injected, the number of holes in the porous chassis 3 and the time for the solvent to flow out Relationship, the present embodiment adopts 20 through holes with a diameter of 2.00mm, the mesh of the support frame is a square, the side length is 4.5mm, and the particle diameter of RAP is all above 4.75mm. The time is 1min.

[0045] Step 2: Take 300g of RAP and place it in the device, pour trichlorethylene into the container, wait until the trichlorethylene flows out of the container, collect the solution that dissolves...

Embodiment 2

[0051] This embodiment tests the change of 70# petroleum asphalt mixture from outside to inside under the RAP surface aging asphalt DSR test after 1 year of use:

[0052] Step 1: Use figure 1 In the shown device, the RAP is placed on the support frame of the container, and the toluene is injected into the container to rinse, and the amount of solvent injected and the relationship between the number of holes in the porous chassis and the time left by the solvent are adjusted. The present embodiment adopts 20 apertures of The through hole of 1.00mm, the mesh of the support frame is square, the side length is 4.5mm, the particle size of RAP is above 4.75mm, and the single time of washing RAP in toluene is determined to be 2min.

[0053] Step 2: Take 300g of RAP and place it in the device, inject toluene into the container, wait until the toluene flows out of the container, collect the dissolved aged asphalt for testing.

[0054] The third step: the same volume of solvent is used...

Embodiment 3

[0059] This example tests the change of the viscosity of the 70# petroleum asphalt mixture from the outside to the inside at 135°C of the aged asphalt on the RAP surface after one year of use:

[0060] Using 30 through holes with a diameter of 1.50mm, the mesh of the support frame is a square, the side length is 7mm, and the particle size of RAP is above 9.5mm. It is determined that the single time of RAP flushing in THF is 1.5min, and other conditions are the same as The same as in Example 1, the delamination of the aged asphalt on the RAP surface was carried out.

[0061] The test results of viscosity from inside to outside are shown in the table below:

[0062] layers / time

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Abstract

The invention relates to a device for layering stripping of aged asphalt on the surface of a recycled asphalt pavement material. The device comprises a container, wherein the container is used for containing a solvent capable of dissolving asphalt and the recycled asphalt pavement material; an opening is formed in the upper end of the container; a base plate with a plurality of through holes are formed at the lower end of the container; and a solution collection device is arranged below the base plate. According to the device and the method, the solvent capable of dissolving asphalt can be injected into the container, and the recycled asphalt pavement material is immersed by the solvent; the through holes are formed in the base plate at the lower end of the container, and thus the solvent can flow outside from the through holes of the base plate and can enter the solution collection device; the operation is continuously repeated; the dissolved quantity of the recycled asphalt pavement material in the solvent is controlled by controlling the efflux time of the solvent, and then layering stripping of the aged asphalt on the recycled asphalt pavement material can be realized; and the aged asphalt is extracted from the collected solvent, the ageing degree of the aged asphalt on the recycled asphalt pavement material from the exterior to the interior is evaluated, and accurate analysis of the aged asphalt on the recycled asphalt pavement material is facilitated.

Description

【Technical field】 [0001] The invention belongs to the technical field of asphalt regeneration, and in particular relates to a device and method for layering and stripping aged asphalt on the surface of a regenerated asphalt pavement material. 【Background technique】 [0002] The recycling of recycled asphalt pavement (RAP) has been widely used in road engineering. At present, it is popular to treat RAP as "black gravel" or aggregate, but the aged asphalt contained in it cannot be ignored, and the old asphalt is brittle. Under the action of load, it is easy to break. When designing the mix ratio of the pavement recycled mixture, it is necessary to analyze the performance of the aged asphalt on the surface of the RAP in order to determine the best RAP blending ratio to achieve the best performance of the recycled mixture. During the use of asphalt pavement, the asphalt mixture will age under the influence of load, temperature, light, etc., and various properties will change. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28
Inventor 王振军刘亮安等等徐闯吴佳育王红飞雷奔张申张婷
Owner CHANGAN UNIV