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Method for predicting dynamic modulus of asphalt mixture and application thereof

A technology of asphalt mixture and dynamic modulus, applied in prediction, data processing application, geometric CAD, etc., can solve problems such as inability to effectively characterize influence and inability to predict aging rheological properties of asphalt

Active Publication Date: 2020-03-27
TAIYUAN UNIV OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

During the thermo-oxidative aging process, the two main factors affecting the decay of asphalt rheological properties are aging temperature and aging time. It is impossible to effectively characterize the influence of aging temperature and aging time on the complex shear modulus and phase angle, let alone predict the rheological properties of asphalt aging

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  • Method for predicting dynamic modulus of asphalt mixture and application thereof
  • Method for predicting dynamic modulus of asphalt mixture and application thereof
  • Method for predicting dynamic modulus of asphalt mixture and application thereof

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Embodiment Construction

[0052] The steps of a method for predicting an asphalt aging rheological master curve and an implementation method for its application are as follows:

[0053] (1) Select the asphalt pavement that has been built in the area, and conduct the test on the original canned asphalt PG58-28 of a certain production area used when the road section is newly built. Heat the canned bitumen as it is at 130°C for 10-15 minutes, pour it into aluminum pans with a diameter of 10cm, the actual bitumen in each aluminum pan is 10g, and form a film with a thickness of about 1mm through self-leveling. Repeat for many times. a similar sample. The asphalt film sample is subjected to different degrees of thermo-oxidative aging in a well-known thermo-oxidative aging box, the aging temperatures are 55°C, 70°C and 85°C respectively, and the aging time t at each aging temperature B 0 days, 5 days, 10 days, 20 days and 30 days;

[0054] (2) Take out asphalt samples with different degrees of thermal oxyge...

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Abstract

The invention relates to a method for predicting the dynamic modulus of an asphalt mixture and application of the method. The method comprises steps of carrying out a dynamic frequency scanning test on the samples with different aging degrees; measuring a plurality of shear moduli under different test temperatures and loading frequencies; obtaining indexes such as cross modulus, cross frequency, rheological parameters and the like in different aging states according to the asphalt complex shear modulus, the phase angle, the energy storage modulus and the loss modulus so as to rotate and translate the asphalt complex shear modulus and the phase angle main curve, and establishing the asphalt complex shear modulus and the phase angle main curve in a wide aging temperature and aging time range; therefore, the dynamic modulus E * of the asphalt mixture can be predicted, and a basis is provided for determining the preventive maintenance time of the asphalt pavement.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a method for predicting the dynamic modulus of asphalt mixture and its application. Background technique [0002] In the natural environment of pavement, the decay of rheological properties caused by thermo-oxidative aging of asphalt is one of the important factors affecting the mechanical properties of asphalt mixture and directly affects the use efficiency of asphalt on pavement. Therefore, a method for evaluating and predicting the rheological properties of asphalt aging is proposed is of great significance. Existing indicators for evaluating the aging performance of asphalt mostly focus on the measurement results at a given temperature or frequency (time), such as penetration, softening point, and ductility, which cannot truly reflect the evolution of rheological properties of asphalt in a non-isothermal environment. , and cannot accurately reflect the aging degree and agin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/04G06F30/13G06F30/20
CPCG06Q10/04
Inventor 刘芳王永宝张翛宋帅樊伟恩刘晓东杜月林王晋峰王钢
Owner TAIYUAN UNIV OF TECH
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