A RADIO-ACTIVE METHOD FOR MEASURING VARIATIONS IN DENSITY IN CONCRETE CORES, CUBES AND BEAMS

AN APPARATUS FOR MEASURING THE VARIATION OF DENSITY ALONG CORES AND BEAMS OF CONCRETE IS DESCRIBED' THE VARIATION OF DENSITY IS DETERMINED BY MEASURING THE CHANGE IN THE ABSORPTION OF GAMMA RADIATION. THE GAMMA RAYS EMANATE FROM A ONE MILLCURIE SOURCE OF CESIUM 137 AND ARE DETECTED BY A SCINTILLATION COUNTER. THIS IS CONNECTED TO A RATE-METER AND A CHART-RECORDER WHICH CONTINUOUSLY DISPLAY THE INTENSITY OF RADIATION TRASMITTED AS THE SAMPLE TRAVERSES ALONG ITS DEPTH DIMENSION THROUGH THE GAMMA BEAM. THE VARIATION IN THE INTENSITY OF THE TRANSMITTED RADIATION IS TRANSLATED INTO DENSITY VARIATIONS BY A SUITABLE CALCULATION. ATTENTION IS DRAWN TO THE NEED TO RETAIN, FOR EACH TYPE OF SPECIMEN, THE SAME SOURCE-SAMPLE-DETECTOR GEOMETRY, BUT IT IS SHOWN THAT, WITH CAREFUL OPERATION, VARIATIONS MAY BE MEASURED WITH A STANDARD DEVIATION OF ABOUT 1 LB PER CUBIC FT. ALTHOUGH DESIGNED FOR USE WITH CONCRETE SPECIMENS, THE TECHNIQUE CAN BE APPLIED TO ANY COHESIVE MATERIAL. /RRL/

  • Supplemental Notes:
    • Vol 18, No 55, PP 95-101, 7 FIG, 1 TAB, 1 PHOT, 1 REF
  • Authors:
    • HARLAND, D G
  • Publication Date: 1966-6

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Filing Info

  • Accession Number: 00212248
  • Record Type: Publication
  • Source Agency: Road Research Laboratory /UK
  • Files: TRIS
  • Created Date: May 29 1994 12:00AM