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Research on the Fatigue Performance of Cement Stabilized Subbase Course Materials

Author: LinZuoZuo
Tutor: ZhengNanXiang
School: Chang'an University
Course: Road and Railway Engineering
Keywords: Semi-rigid base Fatigue life Fatigue equation Stress ratio Resilient modulus
CLC: U414
Type: Master's thesis
Year: 2011
Downloads: 57
Quote: 0
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Abstract


Semi - rigid asphalt pavement of the main road structure type , and durability of semi-rigid base directly affect the nature of the use and durability of the asphalt pavement , while the current semi-rigid base material Resilient modulus design values ??used indoor under static conditions of the initial value, and does not consider the actual road under the stress condition of the modulus of the attenuation . Therefore , this article is to make use of the the fatigue test research base materials under dynamic loading Resilient Modulus attenuation , and at the same time to study the fatigue properties of the material . Framework dense structure recommended Firstly, selected on the design specifications , suspension dense structure and the Task Force level with , respectively, using isostatic pressing and vibration molding specimens , strength the indicators and stiffness indicators comparative analysis of different molding methods . Through analysis, the two types of structure , tensile or flexural strength and compressive strength does not have a good correlation . Taking into account the good nature of the mechanical indicators and in the course of field use , and end-use the team graded to study the fatigue performance of cement stabilized crushed stone and modulus decay law . Second, by comparison of the the existing indoor fatigue test method to determine the splitting of the fatigue test standard test methods . Indoor isostatic pressing and vibration molding cylinder specimen fatigue test using the method , considering the intermittent time , crack propagation and force status and other factors on fatigue equation theory correction , and domestic and international typical fatigue equation comparative analysis . Fatigue test process , the test after some cyclic loading under compressive resilient modulus , this research cement stabilized crushed stone in the dynamic loads modulus decay law , and put forward the design of Resilient Modulus the modulus ratio of the different stages of decay , by the initial modulus of the substrate material to determine stage modulus RMS .

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