A NEW FIELD TEST FOR HIGHWAY SHOULDER PERMEABILITY

MANY PAVEMENT FAILURES CAN BE TRACED TO A LOSS OF SUPPORT BY THE ROADBED. THIS CONDITION IS OFTEN THE RESULT OF INADEQUATE DRAINAGE THROUGH HIGHWAY SHOULDERS THAT LOSE THEIR DESIRED PERMEABILITY WHEN WATER BECOMES TRAPPED BENEATH THE PAVEMENT. THIS PAPER PRESENTS A NEW METHOD OF TESTING THE DRAINAGE OF HIGHWAY SHOULDERS IN THE FIELD. THE TEST IS RAPID AND ENABLES THE OPERATOR TO OBSERVE VISUALLY THE ADVANCE OF A SATURATED MOISTURE FRONT THROUGHOUT A SHOULDER CROSS-SECTION BY NOTING THE LIGHTING SEQUENCE OF SMALL NEON BULBS ARRANGED IN A GRID ON A PANEL. THESE BULBS ARE ELECTRICALLY CONNECTED TO STEEL PROBES DRIVEN INTO THE SHOULDER AT INTERVALS ALONG ITS WIDTH. THE TEST AND THE EQUIPMENT WERE DEVELOPED WITH A FULL-SCALE LABORATORY MODEL OF A HIGHWAY SHOULDER, USING VARIOUS GRADATIONS AS THE SINGLE VARIABLE. SPECIAL GRAPHS WERE PLOTTED TO ENABLE AN OPERATOR TO GET A GENERAL IDEA OF THE PERMEABILITY OF THE MATERIAL IN A VERY SHORT TIME WHILE THE TEST IS IN PROGRESS. THE FIELD TESTS SHOW GOOD AGREEMENT WITH THE LABORATORY DATA. FURTHER FIELD WORK IS UNDER WAY ON MAJOR HIGHWAYS IN SEVERAL PARTS OF THE STATE OF WASHINGTON. /HRB/

  • Supplemental Notes:
    • Vol 41, pp 109-124, 13 FIG, 3 TAB, 9 REF, 2 APP
  • Authors:
    • Maytin, I L
  • Publication Date: 1962

Media Info

  • Monograph Title: Proceedings of the 41st Annual Meeting of the Highway Research Board, Washington, D.C., January 8-12, 1962
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00204374
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Jan 31 1972 12:00AM