During the construction of new pavements, testing of the in situ subgrade may indicate that at some locations the subgrade design strength is lower than that used in the original pavement structural design. In addressing the structural deficiency of such low subgrade strength areas, the most commonly used approach is not to change the pavement layers but rather to treat the subgrade. A common treatment is the removal of the low strength subgrade to the required depth and replacement with selected subgrade material with a design strength exceeding the original subgrade design strength.
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