Base Course of Flexible Pavement

Monday, September 30, 2013 19:41
Posted in category Pavement and Foundation
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Base Course of Flexible pavement

The first coat to be placed, on top of your proper sub-base, is the base course. It provides additional load distribution and contributes to drainage and frost resistance. 

typical detail of road section base course

  • The base is built of clean sand or rock.
  • The base layer provides uniform support to the pavement and allows water that penetrates any joints or cracks in the pavement to move quickly to the sub-drain without saturating and softening the sub-grade.
  • This coat is put in place for strength, plus it works as a true-leveler course, to take out any small imperfections in the grade.
  • After the binder is put into place with paver, it is compacted with a vibratory roller for tighter density and added strength.

Base courses are usually constructed out of:

  1. Aggregate: Base courses are most typically constructed from durable aggregates that will not be damaged by moisture or frost action such as dense bitumin macadam (dbm).
  2.  HMA: In certain situations where high base stiffness is desired, base courses can be constructed using a variety of HMA mixes.
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