SHOULDER STRUCTURAL DESIGN AND CONSTRUCTION CONSIDERATIONS

IN THE DESIGN AND CONSTRUCTION OF PAVEMENTS WHICH MUST PROVIDE AN ALL-WEATHER REFUGE FOR VEHICLES, LATERAL SUPPORT FOR THE PAVEMENT AND PREVENT SUBSURFACE INFILTRATION OF SURFACE RUNOFF, THE PROVISION FOR AN UNDERDRAINAGE SYSTEM EQUIVALENT TO THAT FOR MAINLINE PAVEMENTS, AND THE USE OF HIGHLY DURABLE MATERIALS WHICH WILL RESIST FREEZE-THAW EFFECT IN THE PRESENCE OF DE-ICING CHEMICALS ARE IMPORTANT. EXPERIMENTAL RESULTS OF BITUMINOUS-AGGREGATE (BAM), CEMENT-AGGREGATE MIXTURES (CAM), POZZOLAN-AGGREGATE MIXTURES (PAM) AND CEMENT CONCRETE USAGE AS SHOULDER PAVING MATERIALS IS REPORTED. PAM AND CAM DO NOT REACT FAVORABLY TO FREEZING AND THAWING AND ARE BEST USED AS PAVEMENT SUBBASES. BITUMINOUS-AGGREGATE MIXTURES OF 8 INCHES THICKNESS AND 6-INCH PORTLAND CEMENT CONCRETE SHOULDERS HAVE PROVED DURABLE. CRUSHED STONE AND CRUSHED GRAVEL ARE SUPERIOR MATERIALS FOR USE AS OPEN-GRADED SUBBASE. INTERLOCKING ANGULAR CRUSHED AGGREGATE PROVIDES BETTER SUPPORT THAN NATURAL SANDS OR GRAVEL FOR PLACEMENT OF SUPERFICIAL LAYERS. STABILIZED AGGREGATE MIXTURES USED AS SHOULDER BASE WERE PLACED WITH MACHINES THAT OPERATED FROM THE PAVEMENT. COMPACTION WAS EFFECTED WITH CONVENTIONAL EQUIPMENT AND PROCEDURES. SPECIFIC EXPERIENCES WITH BAM, CAM AND PAM AND PORTLAND CEMENT CONCRETE MATERIALS ARE REPORTED. TO FACILITATE SURFACE DRAINAGE, THE SURFACE SHOULD BE FINISHED AT LEAST 1/4 INCH BELOW THE PAVEMENT EDGE. CONSTRUCTION OF NATURAL SOIL PAVEMENTS ARE ADEQUATE WHEN TRAFFIC VOLUMES ARE LOW, PROVIDED SUCH SHOULDERS ARE COMPACTED DURING CONSTRUCTION AND TRIMMED TO OFFER QUICK SURFACE DRAINAGE. PORTLAND CEMENT CONCRETE USAGE PROVED TO BE THE MOST EXPENSIVE OF THE MATERIALS USED IN THOSE EXPERIMENTAL CONDITIONS,

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Filing Info

  • Accession Number: 00206080
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 31 1973 12:00AM