A Method for Evaluating the Fatigue Performance of Asphalt Mortar

A fatigue performance and asphalt adhesive technology, applied in the direction of strength characteristics, instruments, and the use of repetitive force/pulse force to test material strength, etc. , to achieve the effect of short test period and small test investment

Active Publication Date: 2019-01-04
南京宁通智能交通技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a method for evaluating the fatigue performance of different asphalt mortars under dynamic load with small test investment, short test period, to overcome the huge test equipment in the prior art, high test investment, and non-dynamic loads that cannot represent the actual road surface. Defects under stress

Method used

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  • A Method for Evaluating the Fatigue Performance of Asphalt Mortar
  • A Method for Evaluating the Fatigue Performance of Asphalt Mortar
  • A Method for Evaluating the Fatigue Performance of Asphalt Mortar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Example 1 Jiangsu 70# asphalt mortar

[0050] The test pieces that meet the requirements are carried out step by step according to the test method of the present invention.

[0051] Determination of relaxation modulus E of Jiangsu 70# asphalt mortar under low-strain cyclic loading 1 and the relaxation parameter m.

[0052] Table 2 Jiangsu 70# asphalt mortar E 1 and m value

[0053] Asphalt Mortar Type

E 1

m

Jiangsu 70#

2.1E+08

0.4

[0054] Determination of complex reference modulus G of undamaged Jiangsu 70# asphalt mortar under low-strain cyclic loading R :

[0055] By calculating the reference modulus G of Jiangsu 70# asphalt mortar R It is 2.82E+09.

[0056] Establish the fatigue damage equation under high strain cyclic loading, and determine the fatigue parameter b; the fatigue parameter b of Jiangsu 70# asphalt mortar is calculated to be 31.6967.

[0057] Determination of Adhesion Work ΔG of Asphalt Binder and Aggregate Usi...

Embodiment 2

[0059] Example 2 Linla 90# ​​asphalt mortar

[0060] The test pieces that meet the requirements are carried out step by step according to the test method of the present invention.

[0061] Determination of relaxation modulus E of Linla 90# ​​asphalt mortar under low-strain cyclic loading 1 and the relaxation parameter m.

[0062] Table 3 Linla 90# ​​asphalt mortar E 1 and m value

[0063] Asphalt Mortar Type

E 1

m

Linla 90#

5.25E+08

0.23

[0064] Determination of complex reference modulus G of undamaged Linla 90# ​​asphalt mortar under low-strain cyclic loading R .

[0065] By calculating the reference modulus G of Linla 90# ​​asphalt mortar R It is 3.00E+09.

[0066] Establish the fatigue damage equation under high-strain cyclic loading, and determine the fatigue parameter b; the fatigue parameter b of Linla 90# ​​asphalt mortar is calculated as 100.

[0067] Determination of Adhesion Work ΔG of Asphalt Binder and Aggregate Using Surf...

Embodiment 3

[0069] Example 3 Tahe 90# asphalt mortar

[0070] The test pieces that meet the requirements are carried out step by step according to the test method of the present invention.

[0071] Determination of the relaxation modulus E of Tahe 90# asphalt mortar under low-strain cyclic loading 1 and the relaxation parameter m.

[0072] Table 4 Tahe 90# asphalt mortar E 1 and m value

[0073] Asphalt Mortar Type

E 1

m

tower river

4.00E+08

0.28

[0074] Determination of complex reference modulus G of undamaged Tahe 90# asphalt mortar under low-strain cyclic loading R :

[0075] By calculating the reference modulus G of Tahe 90# asphalt mortar R It is 3.60E+09.

[0076] Establish the fatigue damage equation under high strain cyclic loading, and determine the fatigue parameter b of Tahe 90# asphalt mortar; through calculation, the fatigue parameter b of Tahe 90# asphalt mortar is 619.03.

[0077] Determination of Adhesion Work ΔG of Tahe Asphalt M...

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Abstract

The invention discloses a method for evaluating the asphalt mastic fatigue performance. The asphalt cement and aggregates are formed and are made into asphalt mastic test pieces; the asphalt mastic fatigue performance is evaluated through the crack expansion index delta R(N) in the given load circulation times N of the asphalt mastic test pieces. The method provided by the invention is combined with an asphalt and aggregate surface free energy test and dynamic mechanical analysis experiment method; the area defined by a stress-pseudo strain curve is used for expressing the energy dissipation after the damage of the fatigue test pieces; in addition, the time effect can be eliminated; the asphalt mastic fatigue performance is evaluated; the fatigue service life of the asphalt mastic and asphalt mixture is predicted. Compared with other fatigue tests, the test method provided by the invention has the advantages that the test investment is low; the test period is short; the practical stress state of the pavement can be represented under the dynamic load.

Description

technical field [0001] The invention belongs to the technical field of road engineering, and in particular relates to a method for evaluating the fatigue performance of asphalt mortar. Background technique [0002] Fatigue damage is one of the most important damage forms of asphalt pavement. As early as 1942, O.J. Porter pointed out the phenomenon of fatigue damage of asphalt pavement under the action of driving load. In order to ensure good usability and durability of asphalt pavement, asphalt pavement design methods around the world take pavement fatigue characteristics as the basic design principle, so it is of great significance to study the fatigue characteristics of asphalt mixture. [0003] Researchers at home and abroad use different approaches to study the fatigue performance of asphalt mixtures. These methods can be classified into three categories: phenomenological methods, fracture mechanics methods and energy consumption theory. The phenomenological method cons...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/32
CPCG01N3/32G01N2203/0007G01N2203/0073
Inventor 纵瑾瑜王永维牛晓伟刘伟张可强韩鹏李锋吴昊
Owner 南京宁通智能交通技术研究院有限公司
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