Method for testing and evaluating self-healing performance of asphalt

A technology of asphalt self-healing and evaluation method, which is applied in the direction of testing material strength by applying stable shear force, testing material strength by applying repetitive force/pulsation force, and measuring devices, which can solve the problem of not having asphalt modulus and resistance Fatigue performance recovery degree and other issues

Active Publication Date: 2021-09-24
HARBIN INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing asphalt self-healing evaluation indicators do not have the ability to comprehensively characterize the modulus and fatigue resistance recovery of asphalt, and reflect the differences in modulus recovery and fatigue resistance recovery.

Method used

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  • Method for testing and evaluating self-healing performance of asphalt
  • Method for testing and evaluating self-healing performance of asphalt
  • Method for testing and evaluating self-healing performance of asphalt

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specific Embodiment approach 1

[0030] Embodiment 1: The method for testing and evaluating the asphalt self-healing performance in this embodiment is implemented according to the following steps:

[0031] Step 1. Linear Amplitude Sweep Test (LAS)

[0032] The asphalt sample was kept at the test temperature, and the dynamic shear rheometer was used to apply a sine wave load with gradually increasing amplitude to the asphalt sample, and the dynamic shear modulus was measured, and then the dynamic shear modulus was taken as the ordinate, Obtain the dynamic shear modulus-strain curve test chart with the strain amplitude as the abscissa, find out the data point where the dynamic modulus value is reduced to 90% of the initial dynamic shear modulus value, and the corresponding strain amplitude of the data point is is the strain threshold ε in the linear viscoelastic range of the asphalt material t ;

[0033] Step 2. Self-healing test

[0034] The self-healing test includes low-strain time-scanning test, fatigue ...

specific Embodiment approach 2

[0052] Embodiment 2: This embodiment differs from Embodiment 1 in that the test temperature described in step 1 is 10°C to 30°C.

specific Embodiment approach 3

[0053] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in Step 1, the holding time of the asphalt sample at the test temperature is 20 minutes to 40 minutes.

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Abstract

The invention discloses a method for testing and evaluating the self-healing performance of asphalt, belongs to the field of asphalt material performance detection, and aims to solve a problem that a test method and an evaluation index for effectively and accurately evaluating the self-healing performance of an asphalt material are lacked in the existing asphalt self-healing performance evaluation. The test and evaluation method comprises the following steps of 1, a linear amplitude scanning test; 2, (1) a low-strain time scanning test, applying the low-strain time scanning test with the strain amplitude of epsilon s to the asphalt sample by using a dynamic shear rheometer; (2) taking the condition that the dynamic shear modulus is reduced to G*D as an ending condition of a fatigue test I, and performing the fatigue test I; (3) respectively carrying out a low-strain time scanning test at the initial stage and an end stage of the intermittent healing stage; (4) performing a fatigue test II; and 3, calculating the healing index representing the asphalt healing performance. The index provided by the invention is based on the asphalt self-healing mechanism, and can effectively characterize the asphalt self-healing process.

Description

technical field [0001] The invention belongs to the field of performance detection of asphalt materials, and in particular relates to a method for evaluating self-healing performance of asphalt. Background technique [0002] Asphalt material is a kind of viscoelastic material with self-healing properties, which is widely used in the construction of highway pavement and airport pavement. During the long-term service of asphalt pavement, the fatigue damage caused by repeated load is one of the main diseases affecting the service condition of asphalt pavement. Studies have shown that under suitable temperature conditions and no load, asphalt has the ability to partially or completely heal internal cracks, thereby prolonging the service life of the pavement and improving the service condition of the road. However, the self-healing properties of asphalt have not been fully paid attention to in the existing asphalt pavement design process and in the fatigue life estimation of asp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/42G01N3/32G01N3/24
CPCG01N33/42G01N3/32G01N3/24G01N2203/0073G01N2203/0025
Inventor 吕慧杰谭忆秋张超王飞肖神清熊学堂王英园
Owner HARBIN INST OF TECH
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