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Test method for testing fatigue performance of asphalt binder

A technology of asphalt binder and test method, which is applied to the preparation of test samples and the use of stable shear force to test the strength of materials, etc., can solve the problems of poor stability of test results, long time-consuming, limited promotion, etc., to achieve The equipment is simple and cheap, the test process is simple, and the test results are stable and reliable.

Inactive Publication Date: 2012-10-17
TONGJI UNIV
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AI Technical Summary

Problems solved by technology

Although the fatigue parameter N P20 The non-linear elasticity and failure characteristics of asphalt binder are considered in the test, but the test takes too long and the stability of the test results is not good, which limits the popularization of this test method

Method used

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  • Test method for testing fatigue performance of asphalt binder
  • Test method for testing fatigue performance of asphalt binder
  • Test method for testing fatigue performance of asphalt binder

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Embodiment Construction

[0020] Asphalt binder fatigue performance test method of the present invention utilizes yield energy as an index for evaluating the fatigue performance of asphalt binder, and yield energy is obtained by the following steps:

[0021] A. Making dynamic shear samples of asphalt binder;

[0022] B. Heat the asphalt binder dynamic shear sample, heat it to the test temperature and keep it warm for at least 20 minutes, and the test temperature range is 10°C to 20°C;

[0023] C. Using the continuous flow mode of the dynamic shear rheometer, the asphalt binder dynamic shear sample is loaded, the shear strain increases with time, the shear strain increase rate is 0.005 / s, and the shear stress increases with the shear strain When the shear stress is gradually reduced to 80% of the maximum shear stress, the test is terminated, during which the shear stress and shear stress of the asphalt binder dynamic shear sample are recorded. shear strain data;

[0024] D. Draw a stress-strain curve ...

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Abstract

The invention discloses a test method for testing the fatigue performance of an asphalt binder. The test method comprises the following steps: making a dynamic shear sample of the asphalt binder; heating the dynamic shear sample of the asphalt binder to a test temperature, and maintaining the temperature for at least 20min, wherein the test temperature is in a range of 10-20DEG C; adopting a continuous flow mode of a dynamic shear rheometer to make the shear strain uniformly increase with time and the shear strain increase rate be 0.005 / s, loading the asphalt binder sample, ending the test when the shear stress gradually reduces to 80% of maximum shear stress, and recording the shear stress and shear strain data of the dynamic shear sample of the asphalt binder during the test; and drawing a stress-strain curve according to the tested shear stress and the shear strain data, and calculating to obtain the yielding strength of the asphalt binder. The test method for testing the fatigue performance of the asphalt binder of the invention has the advantages of simple test process, and stable and reliable test result, and adopts the yielding strength index to quantitatively evaluate the fatigue performance of the asphalt binder.

Description

technical field [0001] The invention belongs to the field of road engineering and relates to a test method for testing the fatigue performance of asphalt binders. Background technique [0002] The Superpave (high-performance asphalt pavement) asphalt binder specification proposes to use the fatigue factor G*sinδ as the fatigue performance index of asphalt binder. However, since the Superpave asphalt test is a non-destructive test, the asphalt is in the range of linear elasticity, so the fatigue factor cannot be true. reflect the fatigue performance of asphalt. [0003] Later, NCHRP (National Highway Cooperative Research Organization) proposed a new asphalt fatigue performance test method for modified asphalt, using the fatigue parameter N P20 As the fatigue performance index of asphalt. Although the fatigue parameter N P20 The non-linear elasticity and failure characteristics of asphalt binder are considered in the test, but the test takes too long and the stability of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/24G01N1/28
Inventor 李立寒吕天华袁坤耿韩张立文
Owner TONGJI UNIV
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