Dynamic Mechanical Analysis Method for Viscoelasticity of Asphalt Mixtures
An asphalt mixture and dynamic mechanics technology, applied in the field of material viscoelasticity, can solve the problems of difficult to use models, complex rheological models, and difficulty in solving component parameter values, achieving high compliance, simple rheological models, and test steps. and easy-to-use effects
Active Publication Date: 2021-08-06
TONGJI UNIV
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Problems solved by technology
The 2S2P1D model (2springs, 2fractionalderivative elements, 1dashpot), which includes 2 spring elements, 2 fractional derivative elements and 1 sticky pot element, can describe the viscoelasticity of asphalt mixture well, but the rheological model is complicated. It is very difficult to solve the component parameter values
Complex models are also difficult to use by the engineering community
Method used
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Embodiment Construction
[0033] The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings.
[0034] see figure 1 , in one embodiment, a dynamic mechanical analysis method of viscoelasticity of asphalt mixture, comprising the following steps:
[0035] S100, performing a dynamic mechanical frequency sweep test on the sample to be tested; obtaining test data as a test complex plane;
[0036] S110, according to the characteristics of the test complex plane, quote the constant phase angle element (the viscosity of the sticky pot is η p ) to construct a non-ideal solid model;
[0037] S120, deriving complex compliance and complex modulus expressions of non-ideal solid models, and establishing complex plane relational expressions of storage modulus and loss modulus;
[0038] S130, according to the corresponding relationship between the test complex plane graph and the storage modulus-loss modulus complex plane relation of the non-ideal sol...
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The invention relates to a dynamic mechanical analysis method of the viscoelasticity of asphalt mixture, comprising the following steps: performing a dynamic mechanical frequency sweep test on a sample to be tested; obtaining test data as a test complex plane; according to the characteristics of the test complex plane, citing constant phase angle elements to construct Non-ideal solid model; deduce complex compliance and complex modulus expressions of non-ideal solid model, and establish complex plane relational expression of storage modulus and loss modulus; Quantity-loss modulus of the complex plane relationship, solve the component parameter values; Substitute the component parameter values into the complex modulus expression of the non-ideal solid model to obtain the storage modulus and loss under any given angular frequency modulus value. The mechanical properties of the asphalt mixture can be analyzed according to the model and component parameter values. The rheological model proposed by the invention is simple and has a small number of components, but it is highly consistent with the actual test results and has practical physical significance.
Description
technical field [0001] The invention belongs to the technical field of material viscoelasticity research, and in particular relates to a dynamic mechanical analysis method of asphalt mixture viscoelasticity. Background technique [0002] The research methods of viscoelastic materials usually include transient test or dynamic test. Transient testing usually includes creep testing and stress relaxation testing. The creep test refers to applying a small stress to the material and keeping it constant, and recording the change of the strain with time; the stress relaxation test refers to applying a strain to the material and keeping it constant, and recording the change of the stress with time. In dynamic tests, the stress or strain applied to the material is not constant, but changes with time, that is, the stress or strain that changes sinusoidally with time is applied, and the corresponding strain or stress response is studied. [0003] In order to visualize and deeply under...
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IPC IPC(8): G01N3/08G01N3/20
CPCG01N3/08G01N3/20G01N2203/0676
Inventor 杨正宏尹义林姜伟史美伦高国旗
Owner TONGJI UNIV