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Method for separating influences of fatigue damage and thixotropic factor on asphalt modulus

A technology of fatigue damage and separation method, which is applied in the direction of applying repeated force/pulsation force to test the strength of materials, so as to avoid the interference of thixotropy and achieve the effect of accurate response

Active Publication Date: 2012-03-28
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the existing technical problem of using damage theory to analyze the fatigue characteristics of asphalt under cyclic loads, and to provide a separation method for the influence of fatigue damage and thixotropic factors on asphalt modulus

Method used

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  • Method for separating influences of fatigue damage and thixotropic factor on asphalt modulus
  • Method for separating influences of fatigue damage and thixotropic factor on asphalt modulus
  • Method for separating influences of fatigue damage and thixotropic factor on asphalt modulus

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specific Embodiment approach 1

[0008] Specific embodiment one: the separation method of fatigue damage and thixotropic factor influence on asphalt modulus of this embodiment is carried out in the following steps: 1. Test the strain and phase of asphalt under cyclic load in strain scanning mode with dynamic shear rheometer Angle and dynamic modulus data, then take the phase angle as the horizontal mark, and take the dynamic modulus as the vertical mark to draw the standard curve of the relationship between the dynamic modulus and the phase angle; 2. Control the initial strain to 0.5% to 4%, and measure the asphalt at The initial dynamic modulus under this strain |G * |, and phase angle θ, dynamic modulus |G * |The data changing with the action time t, with the phase angle θ as the abscissa, and the dynamic modulus |G * |Plot the dynamic modulus for the vertical scale|G * | and the phase angle θ relationship curve; then increase the strain by 2% to 4% in steps, and measure the phase angle θ and dynamic modu...

specific Embodiment approach 2

[0010] Embodiment 2: This embodiment differs from Embodiment 1 in that the initial strain in step 2 is 1% to 3%. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0011] Embodiment 3: This embodiment is different from Embodiment 1 in that the initial strain in step 2 is 2%. Others are the same as in the first embodiment.

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Abstract

The invention discloses a method for separating the influences of fatigue damage and a thixotropic factor on an asphalt modulus, which relates to a testing method for the asphalt modulus and is used for solving the problem of limitation on the conventional analysis of the asphalt fatigue characteristic under the action of cyclic load with a damage theory. The method comprises the following steps of: drawing a standard relation curve of an asphalt dynamic modulus and a phase angle, testing relation curves of the dynamic modulus and the phase angle under different initial strain conditions, finding a turning point which is deviated from a linear section on each curve, finding a dividing point between a thixotropy influence area and a damage influence area, and fitting curve parts in front of the dividing point to obtain the values of k, alpha and beta; and fitting the dynamic modulus of asphalt to obtain a value D, and separating the dynamic modulus of the asphalt into two parts, i.e., a modulus under the influence of thixotropy and the reduction value of the modulus caused by damage. The method is used for researching the fatigue characteristic of asphalt.

Description

technical field [0001] The invention relates to a testing method for asphalt modulus. Background technique [0002] The fatigue performance of asphalt has an important influence on the performance of asphalt pavement. According to the damage theory, the performance of asphalt after fatigue is irrecoverable. However, as a typical viscoelastic material, the mechanical behavior and fatigue properties of asphalt are special due to the influence of viscoelastic properties. Asphalt is thixotropic, that is, under load, changes in the internal microstructure of asphalt can also cause a decrease in modulus without causing any damage. This makes the reduction of asphalt modulus under repeated loads not entirely caused by damage, but also includes the influence of thixotropy. Therefore, the existing detection methods of dynamic modulus in the fatigue process of asphalt have limitations. Accurately testing the modulus changes caused by damage during the fatigue process is of great si...

Claims

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Application Information

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IPC IPC(8): G01N3/32
Inventor 谭忆秋单丽岩
Owner HARBIN INST OF TECH
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