EFFECT OF PLUS 3/4 - INCH ROCK AND OTHER FIELD VARIABLES ON NUCLEAR GAGE MOISTURE AND DENSITY DETERMINATIONS

THE OBJECTIVES ARE: (1) TO STUDY THE EFFECT OF MORE THAN 10% OF PLUS 3/4-INCH ROCK FRAGMENTS ON SOIL DENSITY AND MOISTURE AS DETERMINED BY NUCLEAR GAGES; (2) TO STUDY THE EFFECT ON NUCLEAR MOISTURE DETERMINATIONS WHEN CORRUGATED METAL PIPE, STRUCTURAL PLATE PIPE, AND PORTLAND CEMENT CONCRETE ARE IN CLOSE PROXIMITY TO THE NUCLEAR GAGE. NUCLEAR MOISTURE AND DENSITY MEASUREMENTS WERE TAKEN ON SAMPLES OF ROADWAY EXCAVATION AND STRUCTURE BACK FILL FROM VARIOUS LOCATIONS THROUGHOUT THE STATE UNDER A VARIETY OF FIELD AND LABORATORY TEST CONDITIONS. INCREASING PERCENTAGE OF PLUS 3/4-INCH ROCK DID NOT AFFECT NUCLEAR MOISTURE CONTENT, DRY DENSITY OR PERCENT RELATIVE COMPACTION IN ANY SYSTEMATIC MANNER. DATA OBTAINED CONFIRMS THAT THE SAND VOLUME METHOD IS NO MORE RELIABLE THAN THE NUCLEAR GAGE METHOD WHEN WET DENSITIES ARE COMPARED WITH THE MEASURED WET WEIGHT UNIT VOLUME OF SOIL OBTAINED BY DIRECT MEASUREMENTS. THE DEPTH OF NUCLEAR GAGE BELOW THE SURFACE OF SURROUNDING SOIL AND THE PROXIMITY OF A CONCRETE STRUCTURE TO THE GAGE BOTH AFFECT NUCLEAR MOISTURE DETERMINATIONS. HORIZONTAL CLEARANCE AROUND THE GAGE IS ALSO FOUND TO AFFECT NUCLEAR READINGS, BUT TO A LESSER DEGREE THAN THE DEPTH VARIABLE. /AUTHOR/

• Supplemental Notes:
  • Final Rept NO M & R, 642978, PP 1-11, 68 FIG, 3 TAB, 9 REF,
• Corporate Authors:

  California Division of Highways

  Bridge Department
  Sacramento, CA  United States  05914
• Authors:
  • Smith, T
  • Hirsch, A D
  • Kleiman, W F
  • Zeiler, B
  • Lister, B
  • Fitzpatrick, R
• Publication Date: 1970-1

Subject/Index Terms

• TRT Terms: Backfilling; Compaction; Concrete structures; Corrugated metal culverts; Depth; Excavations; Field tests; Laboratory tests; Nuclear engineering; Nuclear tests; Rocks; Soil densification; Soil water; Soils
• Old TRIS Terms: Backfills; Nuclear applications; Relative compaction
• Subject Areas: Construction; Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00215402
• Record Type: Publication
• Files: TRIS
• Created Date: Jun 1 1971 12:00AM