EFFECTS ON HIGHWAY SUBDRAINAGE OF GRADATION AND DIRECTION OF FLOW WITHIN A DENSELY GRADED BASE COURSE MATERIAL

Because of the relatively high content of fine-grained particles, densely graded base course aggregates will not readily drain once saturated with water. An investigation of permeability and its effect on drainage of densely graded base course material specified by the Maryland State Highway Administration was conducted using a prototype permeameter. The experimental permeameter provided values of permeability of a compacted sample both in the vertical and horizontal direction without removing or disturbing the compacted specimen. The horizontal permeability was found to be only slightly greater than the vertical permeability. Experimental permeability data was applied to an example of lateral drainage from the midpoint of a roadway to a shoulder drain under conditions proposed by the Army Corps of Engineers for base course drainage. The direction of flow in the base course material was found to have little effect on the drainage characteristics; fines content is the more significant factor in determining the rate of highway subdrainage.

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 50-59
  • Monograph Title: Soil properties
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00263458
  • Record Type: Publication
  • ISBN: 0309022878
  • Files: TRIS, TRB
  • Created Date: Dec 13 1974 12:00AM