A method for evaluating the permeability of non-reactive asphalt regenerant

A technology of asphalt rejuvenator and permeability performance, which is applied in the fields of permeability/surface area analysis, climate change adaptation, suspension and porous material analysis, etc. It can solve the problems of deviation between test results and actual conditions, and unconsidered problems

Active Publication Date: 2022-06-03
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the existing methods, the aging asphalt slices after the regeneration agent has penetrated are mostly used, that is, the three major indicators, viscosity and other tests are carried out on each cut sample, and the changes in the macro indicators indirectly reflect the penetration of the regeneration agent in each layer. , at the same time, the heat preservation temperature of the sample during infiltration is mostly set to the mixing temperature of the regenerant and the old asphalt mixture during the actual thermal regeneration, without considering the subsequent transportation, paving, compaction until the recycled asphalt mixture cools to the ambient temperature The change of temperature field of aged asphalt in the whole process makes the test results deviate from the actual situation

Method used

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  • A method for evaluating the permeability of non-reactive asphalt regenerant
  • A method for evaluating the permeability of non-reactive asphalt regenerant
  • A method for evaluating the permeability of non-reactive asphalt regenerant

Examples

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Effect test

Embodiment 1

[0090] For a certain non-reactive regenerant, in the fifth step, the mass-to-weight ratio of aged asphalt, regenerated agent, and new asphalt during sample preparation is 100:12:100, and the height of the aged asphalt is 5 cm. 5 paragraphs. Cooling curve T a (t) According to the finite element numerical simulation, the holding time is 2.5 hours until the temperature of the sample drops to the set ambient temperature. Calculate the wave number permeation spectrum S(k)-k curve of the sample taken from the aged asphalt after infiltration of the first section (adjacent to the regeneration agent), and the detection wave number range is 500-4000cm -1 ,like figure 1 shown, from which it can be seen that at 500-4000cm -1 In the permeation spectrum, the wave number permeation spectrum values ​​at each wave number are about 5%-8%, reflecting that the penetration ratio of the regenerant in the aged asphalt in the first section above (adjacent to the regenerant) should be approximately...

Embodiment 2

[0092] For a certain non-reactive regenerant, in the fifth step, the mass-to-weight ratio of aged asphalt, regenerated agent, and new asphalt during sample preparation is 100:15:100, and the height of the aged asphalt is 5 cm. 5 paragraphs. Cooling curve T a (t) According to the finite element numerical simulation, the holding time is 2.5 hours until the temperature of the sample drops to the set ambient temperature. The peak wavenumber of the absorption spectrum of a certain functional group is 2919cm -1 , calculate the wave number of the sample taken from the aged asphalt after infiltration from the 1st to the 5th section (the 1st section is the section adjacent to the regeneration agent) from top to bottom to be 2919cm -1 The depth permeation spectrum S(d)-d curve at the position, the FTIR sample taken from the 1st to 5th section from top to bottom is the center of each section of the sample, and the depths are 0.5, 1.5, 2.5, 3.5, 4.5cm, and the depth see permeation spec...

Embodiment 3

[0094] For a certain non-reactive regenerant, in the fifth step, the mass-to-weight ratio of aged asphalt, regenerated agent, and new asphalt during sample preparation is 100:14:100, and the height of the aged asphalt is 5 cm. 5 paragraphs. Cooling curve T a (t) From the finite element numerical simulation, it can be seen that it takes 2.5 hours for the sample temperature to drop to the set ambient temperature. The peak wavenumber of the absorption spectrum of a certain functional group is 2919cm -1 , calculate the wave number of the sample taken from the aged asphalt after infiltration of the first section (the first section is the section adjacent to the regenerant) to be 2919cm -1 The time permeation spectrum S(t)-t curve at the position, the holding time of each group of samples is taken as 0.5, 1.0, 1.5, 2.0, 2.5 hours respectively, the time permeation spectrum is shown in image 3 As shown, it can be seen that the penetration ratio of regenerant molecules containing t...

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Abstract

The invention relates to a method for evaluating the permeability performance of a non-reactive asphalt rejuvenator, comprising the following steps: preparing an aged asphalt sample and a regenerant sample, and obtaining infrared spectra of the two samples; obtaining actual mixing, transportation, paving, Overall cooling curves of compaction and subsequent stages; preparation of test tubes for penetration tests of aged asphalt and regenerant; insulation of test tubes in a water bath; preparation of FTIR samples of aged asphalt after infiltration; calculation of aged asphalt samples after penetration of regenerant Permeation parameters, on this basis to calculate the wave number permeation spectrum S(k)‑k curve, depth penetration spectrum S(d)‑d Curve, time permeation spectrum S(t)‑t Curve; the present invention directly judges the penetration of each component in the regenerant in the aged asphalt from the perspective of functional groups, and introduces the concept of the actual mixing, transportation, paving, compaction and the whole cooling curve in the subsequent stages in the heat preservation of the sample, which is suitable for It is used to evaluate the penetration ability of non-reactive asphalt regenerant in thermal regeneration, so that the evaluation results are more in line with actual engineering.

Description

technical field [0001] The invention relates to a method for evaluating the permeability of a non-reactive asphalt regenerant, belonging to the field of road engineering. Background technique [0002] The non-reactive asphalt regenerator basically does not have chemical reaction with the aged asphalt during the regeneration process. It is a kind of regenerant commonly used in the thermal regeneration of asphalt mixture. , which can be explained by the theory of component supplementation, that is, some components of the old asphalt in the aging process disappear due to physical volatilization or chemical reaction, resulting in the decay of the old asphalt after aging, and some components in the regenerant supplement the lost components in the aging asphalt. , so as to restore the initial performance of the aged asphalt, and for different regenerants, the penetration effect of thermal regeneration is different. [0003] In the existing method, the aging asphalt slices after t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08G01N21/3563G01N25/20
CPCG01N15/08G01N21/3563G01N25/20G01N2021/3595Y02A30/30
Inventor 徐光霁范剑伟朱雅婧赵欣胡兴
Owner SOUTHEAST UNIV
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