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A Test Method for Dynamic Poisson's Ratio of Asphalt Mixture

A technology of asphalt mixture and testing method, which is applied in the direction of applying stable tension/compression to test material strength, preparation of test samples, and measuring devices, etc., which can solve the problem of inability to determine dynamic Poisson's ratio and dynamic Poisson's ratio of asphalt mixture Lag than research and other issues

Active Publication Date: 2021-04-23
RES INST OF HIGHWAY MINIST OF TRANSPORT
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Problems solved by technology

[0005] Aiming at the many deficiencies of the above-mentioned existing asphalt mixture static Poisson's ratio test method and the hysteresis of dynamic Poisson's ratio research, the purpose of the present invention is to provide a kind of asphalt mixture dynamic Poisson's ratio test method, aiming to solve the problems of the prior art. Solve the deficiency that the dynamic Poisson's ratio of asphalt mixture cannot be measured in the prior art

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  • A Test Method for Dynamic Poisson's Ratio of Asphalt Mixture
  • A Test Method for Dynamic Poisson's Ratio of Asphalt Mixture
  • A Test Method for Dynamic Poisson's Ratio of Asphalt Mixture

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Embodiment 1

[0043] Select AC20 asphalt mixture with 70# high modulus, 30# high modulus and SBS modified three kinds of materials with different characteristics, and the corresponding asphalt type, mineral material gradation, optimal asphalt ratio and void ratio etc. The parameters are detailed in Table 1. Try to determine the dynamic Poisson's ratio of the above three asphalt mixtures.

[0044] Table 1 Mixing ratio parameters of three kinds of AC20 asphalt mixture

[0045]

[0046] The specific implementation steps are as follows:

[0047] (1) Preparation of test pieces

[0048] In the test room, four asphalt mixture specimens with a diameter of 150mm and a height of 170mm were molded according to the three kinds of AC20 asphalt mixture ratio parameters in Table 1 through the asphalt mixture rotary compactor. Firstly, core drilling is performed on the formed rotary compaction test piece to obtain a test piece with a diameter of 100 mm and a height of 170 mm; then, 10 mm of both ends...

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Abstract

The invention discloses a method for testing the dynamic Poisson's ratio of an asphalt mixture. A plurality of strain gauges alternately arranged vertically and horizontally are placed at equal intervals in the middle of the side surface of a cylindrical specimen of asphalt mixture; Fix on the loading device; apply sine wave or half sine wave axial compressive stress in the linear viscoelastic range to the specimen; establish the measured total strain ε of each strain gauge t vs. loading time t, recoverable viscoelastic strain amplitude ε 0 The mathematical relationship model of the three can obtain the corresponding recoverable viscoelastic strain amplitude ε of each strain gauge 0 ; Calculate the average value of the recoverable viscoelastic strain amplitude of the transverse strain gauge and the average value of the recoverable viscoelastic strain amplitude of the longitudinal strain gauge to obtain the dynamic Poisson's ratio μ of the asphalt mixture. The method of the invention can accurately and reliably measure the dynamic Poisson's ratio characteristics of different asphalt mixtures at different temperatures and loading frequencies, thereby helping to further improve the asphalt pavement design system and having good popularization and application value.

Description

technical field [0001] The invention belongs to the field of road engineering asphalt pavement, in particular to a method for testing dynamic Poisson's ratio of asphalt mixture Background technique [0002] The modulus and Poisson's ratio of asphalt mixture are the most important material parameters in the design and analysis of asphalt pavement, and their values ​​directly affect the structural design, mechanical analysis and performance prediction of asphalt pavement. As a typical viscoelastic nonlinear material, asphalt mixture has huge difference in dynamic and static material mechanical parameters. As the dynamic parameters are closer to the mechanical response state of asphalt mixture under traffic load, the current international mainstream asphalt pavement design system is gradually changing from static parameter input to dynamic parameter input. The MEPDG asphalt pavement design method in the United States and the "Code for Design of Highway Asphalt Pavement" (JTG D...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08G01N1/28
CPCG01N1/286G01N3/08
Inventor 张晨晨王旭东张蕾周兴业单伶燕刘晋周
Owner RES INST OF HIGHWAY MINIST OF TRANSPORT
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