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SUBGRADE MOISTURE VARIATIONS - EFFECTIVENESS OF EXISTING HIGHWAY DESIGNS
Donald R. Snethen, T A Haliburton
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Abstract
OKLAHOMA HIGHWAY DESIGNS WERE EXAMINED TO DETERMINE WHICH ONES GIVE ACCEPTABLE PERFORMANCE AND WHY/HOW THEY RESIST THE EFFECTS OF SUBGRADE MOISTURE VARIATIONS. REVIEW OF FACTORS PERTINENT TO EVALUATING BOTH PAVEMENT PERFORMANCE AND SUBGRADE MOISTURE CONDITIONS WAS FOLLOWED BY A STUDY OF DESIGNS AT 50 FIELD RESEARCH SITES TO DETERMINE THE RELATIONS BETWEEN DESIGN PERFORMANCE AND OBSERVED SUBGRADE MOISTURE CONDITIONS. THE TYPE OF WEARING SURFACE PROVED TO HAVE LITTLE EFFECT ON EITHER PAVEMENT PERFORMANCE OR SUBGRADE MOISTURE CONDITIONS, WITH UNDERLYING COMPONENTS BEING RESPONSIBLE FOR BOTH. IN GENERAL, THE BEST PERFORMANCE WAS OBTAINED FROM DESIGNS INCORPORATING IMPROVED SHOULDERS; FLEXIBLE, IMPERVIOUS, OR SEMI-PERVIOUS BASE MATERIALS, CONTINUOUS UNDER PAVEMENT AND SHOULDER; SUBBASES; AND ADEQUATE DRAINAGE. /AUTHOR/