This paper describes tests on existing pavements to determine the quantity of free water that infiltrates through the pavement surface and presents some suggested criteria for subdrainage design. Permeability measurements on uncracked specimens of portland cement concrete (PCC) and dense-graded bituminous concrete (BC) have shown that the amount of infiltration through uncracked areas is insignificant when compared to the infiltration that occurs through joints and the cracks that appear in the pavement surfaces. Field tests were made on existing highway pavements to determine how much free water enters the pavement structure through the cracks and joints. Data were collected on five BC pavement section 5 and 34 years old. It is concluded that the PCC and dense-graded BC used in pavement surfaces are virtually impermeable, but they cannot be constructed without joints, or without cracks forming long before their desired life is attained. Pavement structure design should include criteria for the removal of water that infiltrates through the pavement surface. Rainfall duration is more important than rainfall intensity in determining the amount of free water that will enter the pavement structure. For design purposes, the amount of water that will enter a pavement structure can be estimated by using a predicted accepatable amount of cracking and an infiltration rate of 100 cm cubed/h/cm of crack.

Media Info

  • Media Type: Print
  • Features: References; Tables;
  • Pagination: pp 98-100
  • Monograph Title: Soil mechanics: rutting in asphalt pavements, embankments on varved clays and foundations
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00163010
  • Record Type: Publication
  • ISBN: 0309025958
  • Files: TRIS, TRB
  • Created Date: Oct 13 2000 12:00AM