Accelerated loading evaluation of subbase layers in pavement performance : tech summary.
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2009-04-01
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Abstract:The mighty Mississippi River formed and sculpted most of south Louisiana, creating large areas of alluvial
deposits consisting of soft, wet, and unconsolidated soil layers. Many Louisiana pavements were built in
these areas of naturally low shear strength and minimum bearing capacity. Louisiana’s wet climate (over 50
in. of rain per year) combined with the soft alluvial fi ne-grained soils exacerbate the potential for moisture
sensitivity and bearing capacity problems. This leads to both construction and performance problems in the
long term, often exemplifi ed by detrimental pumping of the wet subgrade under repeated traffi c loads. In
some cases, initial construction on wet subgrade soils is often diffi cult because “working table” conditions may
not exist naturally.
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