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原文传递 Impact of Gradation and Moisture Content on Stiffness Parameters of Base Materials

题名：	Impact of Gradation and Moisture Content on Stiffness Parameters of Base Materials
作者：	Pamrakar, P.; Nazarian, S.
关键词：	Bridges (Structural)##Structural health monitoring (SHM)##Flexible pavement construction##Unbound granular base materials##Perfromance of pavement##Fines content##Gradation analysis##Material ablation##Mechanical characteristics##Deformation resistance##Subgrade characterization##Pavement construction##Carleton Laboratory##
摘要：	The performance of exible pavement depends on the mechanical characteristics of its base layer. The mechanical characteristics such as stiffness and deformation resistance depend on many factors such as the material gradation fines content, moisture content, physical properties of coarse aggregate and more. The gradation of material could change due to improper material handling, migration of fines from sub-grade and the other reasons. Similarly, the moisture content of base materials may alter during pavement construction and operation by exposure to excessive water and percolation of rainwater from pavement surface. In this research, the roles of gradation, fines content and moisture content were evaluated to understand the effects on the mechanical characteristics of base. Twelve different tests sequences were performed with a combination of moisture contents from dry to wet of optimum moisture content and fine contents. The increase in moisture content typically had detrimental effect on the mechanical characteristics of the base material. However, the increase in fines (change in gradation) showed mixed results on the mechanical characteristics.
总页数：	57
报告类型：	科技报告