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Method for fast conversion of asphalt mixture material parameters by Laplace transformation

An asphalt mixture and rapid conversion technology, applied in the direction of analyzing materials, measuring devices, instruments, etc., can solve problems such as difficult to guarantee accuracy and complex algorithms, and achieve the effects of accurate acquisition, clear concept, and simple derivation

Active Publication Date: 2019-03-15
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the accuracy of the existing method for calculating the relaxation modulus of asphalt mixture is difficult to guarantee and the algorithm is complicated, and to provide a method for fast conversion of asphalt mixture material parameters by applying Laplace transformation

Method used

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  • Method for fast conversion of asphalt mixture material parameters by Laplace transformation
  • Method for fast conversion of asphalt mixture material parameters by Laplace transformation
  • Method for fast conversion of asphalt mixture material parameters by Laplace transformation

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specific Embodiment approach 1

[0043] Specific implementation mode 1: In this implementation mode, the method of applying Laplace transformation to realize the rapid conversion of asphalt mixture material parameters is implemented according to the following steps:

[0044] 1. Characterization of creep compliance of asphalt mixture

[0045] Test the creep deformation △l of asphalt mixture under fixed load, and then use equation (1) to calculate the creep compliance of asphalt mixture;

[0046]

[0047] In equation (1), △l is the height difference between before loading and after loading, h is the height of the specimen, σ 0 is the load size;

[0048] The Prony series model is used to fit the creep compliance of asphalt mixture. The expression of Prony series is shown in Equation (2):

[0049]

[0050] J in equation (2) 0 and J i is the parameter of the Prony series (where J 0 is the Prony parameter at t=0, J i Obtained by Matlab data fitting), τ i is the delay time, t is the time, and then the c...

specific Embodiment approach 2

[0084] Embodiment 2: This embodiment differs from Embodiment 1 in that in step 1, the asphalt mixture is made into a standard test piece with a diameter of 100 mm and a height of 150 mm.

specific Embodiment approach 3

[0085] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the creep deformation test process in Step 1 is under static loading, the control load is 0.3 MPa, and the loading time is 240s.

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Abstract

Method for fast conversion of asphalt mixture material parameters by Laplace transformation. The invention belongs to the field of asphalt mixture material parameter conversion, and aims to solve theproblems that the precision of an existing method for calculating a relaxation modulus of an asphalt mixture is difficult to ensure and the algorithm is complex. The parameter conversion method comprises: 1, calculating creep compliance of an asphalt mixture, and adopting a Prony series model to fit the creep compliance of the asphalt mixture; 2, applying Laplace positive transformation to the Prony series model of the asphalt mixture, and calculating a Laplace domain relaxation modulus through a conversion relation (as described in the specification) between relaxation modulus and creep compliance in a viscoelastic material; and 3, applying Laplace inverse transformation by adopting an FT method to solve a relaxation modulus time domain solution of the asphalt mixture. According to the method provided by the invention, a relaxation modulus value can be quickly and accurately obtained, and a relaxation modulus at any time can be solved through Laplace integral inverse transformation.

Description

technical field [0001] The invention belongs to the field of asphalt mixture material parameter conversion, and in particular relates to a method for quickly converting asphalt mixture material parameters based on Laplace transformation. Background technique [0002] The relaxation modulus of asphalt mixture is one of the material parameters for structural mechanics calculation of asphalt pavement. However, at present, there is no instrument for directly testing the relaxation modulus of asphalt mixture, but the static creep test of asphalt mixture is used to obtain the creep compliance of asphalt mixture, and then the relationship between relaxation modulus and creep compliance in viscoelastic mechanics is used to obtain the creep compliance of asphalt mixture. The convolution formula performs the calculation of the relaxation modulus. This method first discretizes the convolution formula into a finite number of infinite integrals, and then assumes the modulus value at the...

Claims

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Application Information

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IPC IPC(8): G01N3/00
CPCG01N3/00G01N2203/0003G01N2203/0071G01N2203/0218
Inventor 陈松强冯德成王东升易军艳张锋陈梓宁王晓楠解赛楠
Owner HARBIN INST OF TECH
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