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Dynamic modulus test method for asphalt mixture under bell wave loading mode

A technology of asphalt mixture and dynamic modulus, applied in the direction of applying stable tension/pressure to test material strength, measuring device, analyzing material, etc., can solve the problem of single loading waveform and only consider half-sine wave, etc., and achieve predictable fatigue effect of life

Inactive Publication Date: 2017-05-24
WUHAN UNIV OF TECH
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  • Abstract
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Problems solved by technology

This loading method can measure the dynamic modulus value of asphalt mixture, but many scholars at home and abroad have pointed out that it has many disadvantages: the loading waveform is single, and only half sine wave is considered.

Method used

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  • Dynamic modulus test method for asphalt mixture under bell wave loading mode
  • Dynamic modulus test method for asphalt mixture under bell wave loading mode
  • Dynamic modulus test method for asphalt mixture under bell wave loading mode

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Embodiment Construction

[0018] The following examples further illustrate the technical solutions of the present invention, but are not intended to limit the protection scope of the present invention.

[0019] 1) Determine the maximum value Max=1 of the bell jar wave function expression in one cycle;

[0020] Bell wave function:

[0021]

[0022] In the formula, d is the wavelength of the bell wave, unit: m; x is the horizontal distance from each calculation point to the center of the load in the driving direction, unit: m.

[0023] 2) Through the expression of the bell wave function, the bell wave data of 256 points from x=0 to d, that is, the bell wave data of half a period are obtained; Cover the data of the other half cycle, so as to obtain the data of 512 points of a complete cycle bell wave;

[0024] 3) Obtain bell wave data that UTM-100 can recognize. The bell wave data obtained in 2) is amplified by 65535 / Max to obtain the bell wave data that can be recognized by the UTM-100 servo hydrau...

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Abstract

The invention discloses a dynamic modulus test method for an asphalt mixture under a bell wave loading mode. The dynamic modulus test method comprises the following steps: applying a bell wave load to a cylindrical asphalt mixture test piece with the diameter of 10 cm and the height of 150 cm, applying a load sensor and a displacement sensor to respectively obtain time-varying data of a force value applied to the test piece and time-varying data of axial deformation of the test piece, and obtaining dynamic modulus values of the asphalt mixture under the bell wave loading mode under conditions of sample frequencies of 25 Hz, 10 Hz, 5 Hz, 1 Hz, 0.5 Hz and 0.1 Hz at each of temperatures of -10 DEG C, 4 DEG C, 21 DEG C, 37 DEG C and 54 DEG C through a data treatment mode in AASHTOTP62-07. All results are from test results, and the dynamic modulus values, obtained by test, of the asphalt mixture are real and reliable.

Description

technical field [0001] The invention belongs to the field of road engineering, and in particular relates to a method for testing the dynamic modulus of asphalt mixture. Background technique [0002] In the field of road engineering, the dynamic modulus value of asphalt mixture is used as the basic parameter for asphalt pavement design. The current test method for dynamic modulus of asphalt mixture, the waveform loaded in AASHTO TP62-07 and AASHTO TP79-11 test procedures is a half-sine wave. This loading method can measure the dynamic modulus value of asphalt mixture, but many scholars at home and abroad have pointed out that it has many disadvantages: the loading waveform is single, and only half-sine wave is considered. The mechanical response waveform in the asphalt pavement structure is a rectangular wave at the shallower position of the pavement surface, and gradually changes from a rectangular wave to a half-sine wave and then to a bell wave as the depth increases. ...

Claims

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Application Information

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IPC IPC(8): G01N3/08G01N3/18
CPCG01N3/08G01N3/18G01N2203/0682
Inventor 罗蓉阮莉胡小弟
Owner WUHAN UNIV OF TECH
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