Asphalt mixture life prediction method considering fatigue-creep interaction damage effect
A technology for asphalt mixture and life prediction, which is applied in the direction of applying repeated force/pulsation force to test the strength of materials, and can solve problems such as application limitations
Inactive Publication Date: 2014-03-12
云南交投集团公路建设有限公司
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Problems solved by technology
The fracture mechanics method can only consider steady-state crack propagation, and due to the characteristics of viscosity, elasticit
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Embodiment 1
[0068] Example 1 (asphalt mixture AC-13):
[0069] (1) Determine the complex modulus of asphalt mixture under cyclic loading
[0070] This test uses a testing machine produced by Cooper Research Technology Co., Ltd., which is equipped with high-precision mechanical sensors and displacement sensors. The data that can be recorded automatically include: loading times, stress value, strain value, complex modulus, modulus percentage, hysteresis angle, dissipation energy, etc.
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The invention relates to an asphalt mixture life prediction method considering a fatigue-creep interaction damage effect, and belongs to the field of road engineering. The method comprises the following steps: (1) determining a complex modulus of an asphalt mixture under the action of a period load; (2) determining a damage variable of the asphalt mixture; (3) building a creep damage equation and a fatigue damage equation of the asphalt mixture respectively; (4) building an asphalt mixture life prediction model under the combined action of creep damage and fatigue damage. Compared with a conventional asphalt mixture life prediction method, the viscoelastic behavior of the asphalt mixture is considered and a more accurate prediction model is built. The method accurately describes asphalt mixture damage failure process and rule, has the advantages of wide application range and reliable calculation results, and provides a more reliable method for structural design of an asphalt pavement.
Description
technical field [0001] The invention relates to a life prediction method of asphalt mixture considering fatigue-creep interaction damage, which belongs to the field of road engineering. Background technique [0002] Asphalt pavement is prone to fatigue cracking under repeated loads. Research on the fatigue performance of asphalt mixture and improve the fatigue resistance of asphalt mixture can prolong the service life of asphalt pavement, thereby saving construction and maintenance costs and greatly improving roads, especially Social and economic benefits of high-grade roads. Therefore, the research on the fatigue performance of asphalt mixture has been widely concerned at home and abroad for many years. Asphalt pavement structure design methods in many countries and institutions, such as Shell (SHELL) design method, American AI design method, etc., take the maximum tensile strain of the asphalt layer as the structural design index, and control the fatigue of the asphalt tr...
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Inventor 李国锋唐伯明唐江蒋鹤严恒朱洪洲曹雪娟邹晓翎黄凌李佳佳沈盼
Owner 云南交投集团公路建设有限公司
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