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Method for determining mixing amount of asphalt mixture regenerant based on oil absorption rate of coarse aggregate

A technology of asphalt mixture and coarse aggregate, which is used in roads, road repair, roads, etc., can solve the problems of difficult to guarantee the performance of recycled asphalt pavement, and achieve the effect of significant social and economic benefits, ensure excellent performance, and reduce consumption.

Active Publication Date: 2020-04-07
RES INST OF HIGHWAY MINIST OF TRANSPORT
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Problems solved by technology

The biggest bottleneck that restricts the application of a large proportion of waste asphalt mixture is that the performance of recycled asphalt pavement is difficult to guarantee, and there are technical hidden dangers

Method used

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  • Method for determining mixing amount of asphalt mixture regenerant based on oil absorption rate of coarse aggregate
  • Method for determining mixing amount of asphalt mixture regenerant based on oil absorption rate of coarse aggregate
  • Method for determining mixing amount of asphalt mixture regenerant based on oil absorption rate of coarse aggregate

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Embodiment

[0066] 1. Take 2500g of waste asphalt mixture (RAP), and separate the asphalt and aggregate in the RAP according to the centrifugal separation method in the current "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" to obtain a mixture of asphalt and trichloroethylene. Liquid and aggregate; on this basis, the total bitumen content M (the percentage of bitumen mass in the total mass of mineral aggregate) in RAP can be calculated as 4.2%.

[0067] 2. According to the Absen distillation method in the current "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering", the old asphalt is recovered from the mixture of asphalt and trichlorethylene obtained by the centrifugal separation method, and about 100g of old asphalt can be recovered in this process. Then repeat steps 1-2 roughly 6 times, collect and reclaim about 600g of old asphalt.

[0068] 3. Select recycled old asphalt. First, test the relative density of the old asphalt at 25°C acco...

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Abstract

The invention relates to a method for determining the mixing amount of an asphalt mixture regenerant based on the oil absorption rate of coarse aggregate. The method mainly comprises the following steps: screening the recycled aggregate to obtain coarse aggregate in the aggregate, separately testing the apparent gross volume relative density and the apparent relative density of the coarse aggregate, calculating the absorbed asphalt content of the coarse aggregate according to the composition proportion of the coarse aggregate, and then subtracting the total old asphalt content on the basis toobtain the reference asphalt amount for determining the amount of the regenerant; then carrying out an old asphalt regeneration performance test, and preliminarily determining the amount of a regenerant; and finally, comprehensively evaluating the pavement performance of the regenerated asphalt mixture by preparing the regenerated asphalt mixture, and finally determining the amount of the regenerant. According to the method, the excellent performance of the recycled asphalt pavement can be guaranteed, and the recycling level of waste pavement materials and the driving safety of the recycled asphalt pavement are improved.

Description

technical field [0001] The invention relates to the technical field of road engineering asphalt pavement recycling technology, in particular to a method for determining the dosage of asphalt mixture regenerant based on the oil absorption rate of coarse aggregate. Background technique [0002] my country's asphalt pavement has exceeded 1.3 million kilometers, ranking first in the world, and over 200 million tons of waste asphalt pavement materials (RAP) are produced every year in large and medium-sized repairs, which is the most in the world. Efficiently regenerate the RAP materials produced by road maintenance during the operation period, so that road infrastructure can reduce resource occupation and environmental damage while providing safe and convenient services for economic and social development, and better serve resource conservation and environment-friendly social construction. Significance major. [0003] At present, the recycling rate of road pavement materials in ...

Claims

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Application Information

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IPC IPC(8): E01C19/10
CPCE01C19/10E01C19/1054
Inventor 秦永春王杰曾蔚徐剑黄颂昌
Owner RES INST OF HIGHWAY MINIST OF TRANSPORT
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