Resilient modulus characterization of Alaskan granular base materials.
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2010-08-01
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Edition:Final report.
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Abstract:When spring comes to cold regions, the active layer (the top few feet of soil that freezes and thaws seasonally) thaws quickly, while
deeper soil remains frozen. The active layer becomes saturated with water from snowmelt that collects atop the frozen layer. In these
circumstances, roads across Alaska almost “float” on a soft foundation. Too often, poorly supported pavement buckles and sags under
the weight of heavy tractor trailers and other vehicles, and it remains deformed once the soils drain and re-stabilize. One way to reduce
this damage is to control the amount of fines (essentially rock dust) in a pavement mixture. This project investigated base course
materials commonly used in Alaska’s roads. Liu’s team observed changes in the stiffness of the materials, as well as how their soilwater
characteristics change under freeze-thaw cycles, and how different percentages of fines and moisture influence material
properties. Field tests in Alaska’s three DOT&PF regions and subsequent lab research have been completed. Data from this study will
be used to produce better pavement designs, particularly in some rural areas, where project engineers might be forced to use locally
available material with high fines content.
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