Method for testing dynamic Poisson's ratio of bituminous mixture

Abstract

The invention discloses a method for testing dynamic Poisson's ratio of a bituminous mixture. The method comprises the following steps: laminating a plurality of strain gages which are alternated longitudinally and transversely are arranged at the middle part of the side surface of a cylindrical test piece of the bituminous mixture in an equally-spaced manner; fixing test piece for the laminated strain gages onto loading equipment; applying sine wave or half-sine wave axial pressure stress in the viscoelasticity range of a wire to the test piece; establishing a mathematic relation model of actual measurement total strain epsilon t of each strain gage, loading time t and recoverable viscoelasticity strain amplitude epsilon 0 to obtain recoverable viscoelasticity strain amplitude epsilon 0 respectively corresponding to each strain gage; calculating the average value of recoverable viscoelasticity strain amplitude of the transverse strain gages and the average value of recoverable viscoelasticity strain amplitude of the longitudinal strain gages so as to obtain the dynamic Poisson's ratio mu of the bituminous mixture. According to the method disclosed by the invention, the dynamic Poisson's ratio characteristic of different bituminous mixtures under different temperatures and loading frequencies can be measured accurately and reliably, so that the method is beneficial for furtherimproving a bituminous pavement design system, and the method has preferable popularization and application values.

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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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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