Impact of gradation and moisture content on stiffness parameters of base materials : final report.
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2016-01-01
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Abstract:The performance of flexible 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 subgrade 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.
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