SHALE IN ROAD FOUNDATIONS

SHALES HAVE BEEN USED WITH VARYING SUCCESS IN THE LAYERS OF ROAD FOUNDATIONS. IT IS SHOWN THAT THE TERM "SHALE" COVERS A VERY WIDE RANGE OF ARGILLACEOUS SEDIMENTS WITH CONSIDERABLY VARYING SAND AND SILT CONTENTS AND WHICH MAY BE INDURATED TO A VARYING DEGREE. THE MINERAL COMPOSITION OF SHALE MAKES DISINTEGRATION THE PREDOMINANT TYPE OF WEATHERING WHILE DECOMPOSITION CAN BE NEGLECTED WHEN CONSIDERING ITS PERFORMANCE IN ROAD FOUNDATIONS. ONCE A CERTAIN DEGREE OF INDURATION HAS OCCURRED IT IS UNLIKELY THAT THIS ROCK WILL DETERIORATE UNDER THE EFFECT OF HEAVY TRAFFIC. THE PROCESSES OF HARDENING AND WEATHERING ARE DESCRIBED AND IT IS SHOWN THAT THIS DOES NOT AFFECT THE ROCK UNIFORMLY. THE CHARACTERISTICS OF SHALES VARY OVER A WIDE RANGE, DEPENDING ON THE CONDITIONS OF THEIR FORMATION AND TRANSFORMATION. IT HAS BEEN NECESSARY, THEREFORE, TO BASE SPECIFICATION LIMITS ON A CONSIDERATION OF RESULTS IN SERVICE IN VARIOUS LOCALITIES AND, FROM THESE CONSIDERATIONS, DRY AND WET HARDNESS TESTS ARE SUGGESTED FOR THE SELECTION OF SHALES FOR USE IN ROAD FOUNDATIONS. /RRL/A/

Media Info

  • Serial:
    • Issue Number: 0

Subject/Index Terms

Filing Info

  • Accession Number: 00232038
  • Record Type: Publication
  • Source Agency: Road Research Laboratory /UK
  • Files: TRIS
  • Created Date: Jun 15 1970 12:00AM