A project is described in which sand slurry and sand combination used as trench backfill, restored smooth pavement following a utility installation. The technique typical for narrow, shallow slits for water or other utility lines on busy streets, is sand/water jetted to 95 percent compaction. Normally, the sand is capped with about 6 in. of concrete and resurfaced with 1/2 to 3/4 in. of asphalt. When sand slurry is used, slots 4 to 6 in. wide and about 12 in. deep are saw-cut. After installation of the conduit or small pipe, these are backfilled with a slurry consisting of about one sack of cement for every yard of sand. The slurry is placed from the chute of a transit mix truck. For trenches up to approximately 30 in. wide, water jetted sand backfill offers a fast job that requires no post-job follow-up to compensate for settling. Sand is jetted with water through a 4 ft. length of 1-1/2 to 2 in. pipe. The botton of the pipe is swaged into the form of a slit-like opening. This is forced randomly into the trench until the desired saturation is achieved. backfill sand specifications call for granular material.

  • Corporate Authors:

    McGraw-Hill, Incorporated

    330 West 42nd Street
    New York, NY  United States  10036
  • Publication Date: 1975-8

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00127483
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 10 1976 12:00AM