DETERMINATION OF THE WATER CONTENT OF AGGREGATES AND FRESH CONCRETE BY A NEUTRON METHOD

DETERMINATION DE LA TENEUR EN EAU DES GRNULATS ET DU BETON FRAIS PAR METHODE NEUTRONIQUE

This report is divided into two parts, each of which corresponds to a particular application of the neutron method. (1)Measurement of humidity of aggregates stored in bins: following a study of an apparatus designed for measuring simultaneously the humidity from the deceleration of neutrons and the density by gamma diffusion of materials stored in a bin, the author describes the results obtained under concrete mixing plant conditions using a prototype device. Provided there is standardization on the site itself, the precision of measurement is plus or minus 0.3% of the absolute value of humidity by weight. The volume of measurement is quite significant and represents 350 kg in the case of sand, a considerable proportion of the quantity used for the making of a cubic metre of concrete. (2) the neutron humidity measurement device for fresh concrete: it is important to have available a device for determining rapidly, on site, the water content of fresh concrete. An apparatus is being designed to carry out this measurement on a sample of concrete of 16 litres. This apparatus is easily transportable on site; the precision is estimated at plus or minus 0.3% of the absolute value of humidity by weight. The device has been applied to materials other than concrete. A synthesis of all the results obtained to date is presented. (TRRL)

  • Availability:
  • Corporate Authors:

    Central Laboratory of Bridges & Highways, France

    75732 Paris,   France 
  • Authors:
    • Baron, J P
  • Publication Date: 1977-11

Language

  • French

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00314733
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Rapp Rech LPC 72 Monograph
  • Files: ITRD, TRIS
  • Created Date: Oct 27 1980 12:00AM