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原文传递 Knowledge of Effects of Different Mississippi Soil Deposits on Pavement Performance.

题名：	Knowledge of Effects of Different Mississippi Soil Deposits on Pavement Performance.
作者：	Sheffield, R. H.
关键词：	Subgrade, Chemical stabilization, Cement, Lime, Expansive clays, Silty clays, Volume change
摘要：	The Mississippi Department of Transportation is in the process of implementing the Mechanistic-Empirical Pavement Design procedure for designing rigid and flexible pavements. This implementation effort includes developing a manual, 鈥淢ississippi DOT Pavement ME Design User Input Guide.鈥?The current draft manual will be enhanced with the addition of a chapter focused on various problematic soils located throughout the state. This chapter of the guide will capture available institutional knowledge on the general properties of various geological units of soil deposits and their effects on the performance of pavements constructed thereon. In the 30 years following the implementation of the 1986 Mississippi AHEAD Construction Program, over 1,000 miles of formerly two-lane highways have been upgraded to four-lane arterial standards. A large number of these construction projects involved construction of two new parallel lanes, and then the existing lanes were upgraded to the current safety standards. The pavement design and/or reconstruction of these old existing lanes presented many more challenges than the construction of the new lanes, because the materials used within the roadway prism of the new lanes were much more easily controlled. It is the experiences of the soils encountered and unusual lessons learned during construction of new lanes and reconstruction of the old lanes during this construction program, as well as current design and construction issues, that this research was focused on.
报告类型：	科技报告