A DROP HAMMER PENETROMETER FOR DETERMINING THE DENSITY OF SOILS AND GRANULAR MATERIALS

THE APPLICATION OF A DROP HAMMER PENETROMETER WAS INVESTIGATED AS A RAPID METHOD FOR DETERMINING THE DENSITY OF SOILS AND BASE MATERIALS USED IN HIGHWAY CONSTRUCTION. DESCRIPTION IS GIVEN OF THE DROP HAMMER PENETROMETER, SAMPLE PREPARATION AND TEST PROCEDURE, CALIBRATION PROCEDURE AND PRACTICAL APPLICATIONS OF THE DROP HAMMER PENETROMETER. RESULTS INDICATE THAT THE DROP HAMMER PENETROMETER CAN BE USED TO ESTIMATE RAPIDLY THE DRY DENSITY OF SANDY SOILS AND CRUSHED GRANITE GNEISS. TO MAKE THIS DETERMINATION FOR MATERIALS WHICH HAVE BEEN CALIBRATED, THE MOISTURE CONTENT AS WELL AS THE PENETRATION RESISTANCE IS REQUIRED. IT IS ANTICIPATED THAT THE USE OF THE PENETROMETER IN THE FIELD WOULD BE RESTRICTED TO THOSE SOILS FOR WHICH GOOD CORRELATION HAD BEEN ESTABLISHED AND, IT IS RECOMMENDED THAT BECAUSE OF POSSIBLE THIXOTROPIC BEHAVIOR, THE TIME LAG BETWEEN COMPACTION AND PENETROMETER READINGS BE KEPT TO A MINIMUM. THE OVERALL STANDARD ERROR OF THE PROCEDURE FOR ALL MATERIALS TESTED WAS FOUND TO BE 2.2 PCF. THE TOTAL TIME REQUIRED TO DETERMINE THE UNIT WEIGHT OF A CALIBRATED SOIL OR BASE MATERIAL BY THE USE OF THE DROP HAMMER PENETROMETER (AND THE SPEEDY MOISTURE TESTER TO MAKE THE NECESSARY MOISTURE DETERMINATION) WAS APPROXIMATELY 15 MINUTES.

Language

  • English

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 70-75
  • Monograph Title: Laboratory and field soil tests; lateritic soils
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00229729
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 15 2004 2:39AM