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Asphalt coarse aggregate skeleton structure embedded squeeze Evaluation Methods

Author: SunZongYuan
Tutor: WangXuDong；HeZhaoYi
School: Chongqing Jiaotong University
Course: Road and Railway Engineering
Keywords: Asphalt pavement Skeleton structure Capabilities embedded squeeze Cone Penetration Test Penetration can Finite Element Method
CLC: U414
Type: Master's thesis
Year: 2010
Downloads: 116
Quote: 1
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Abstract

In recent years, China's asphalt pavement construction has made great achievements. But in the new period, with the development of national economy, transportation task increasingly heavy traffic conditions, the emergence of new changes, which resulted in many of asphalt pavement emergence of a variety of failure modes, inflicting huge economic losses and the existing asphalt skeleton structure design and evaluation methods the defects has gradually emerged. Therefore, in order to improve the standard of construction of asphalt pavement, asphalt skeleton structure for evaluation in-depth study is necessary. In this paper, asphalt and abroad skeleton structure design flaws in-depth analysis, based on this, a new set of design to evaluate asphalt coarse aggregate skeleton structure of cone penetration capability embedded squeeze test methods. Specifically, the study should include: asphalt mixture design method and its skeletal structure review, for an existing skeleton structure of asphalt mixture design method of analysis of the existing methods in the design process problems. Coarse aggregate skeleton structure of the new molding equipment research and development. Evaluation of asphalt coarse aggregate skeleton structure embedded squeeze proficiency testing methods of research, based on the relevant argument analysis, we propose a cone penetration test methods of operation and the basic test parameters, and proposed use of cone penetration index price skeleton structure can be embedded squeeze capabilities. Asphalt Mixture Coarse Aggregate Interlocking Ability of structure, the design of the preceding test method for penetration testing, analysis of different source material, different ratios and different degree of compaction under the conditions of extrusion capability embedded skeleton structure, confirms capable of using a cone penetration index evaluation capabilities embedded squeeze feasibility Explores the cone penetration test a theoretical model, based on cone penetration test cone mechanical characteristics, its stress analysis, and set forth for different stages of cone penetration into force approximation theory. Finite element simulations based on cone penetration process deficiencies pointed out cone penetration process simulation problems to be solved: finite deformation problems, contact problems, constitutive, load problems. Then set up to simulate the cone into the finite element model, using the finite element model to analyze the penetration of aggregates during displacement, stress and strain field change. Studies show that: the use of new frame forming device forming the skeleton has good stability, crushed aggregates ratio is small. By performing a large number of cone into the test was found to indicators used to evaluate the penetration of different skeletal structure embedded squeezing capability is reasonable. Meanwhile, through the different stages of the theoretical modeling of cone penetration, making the different stages of cone penetration into force calculations possible. Finally, numerical simulation results show that using finite element analysis can be a good simulation of cone penetration of the whole process.

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