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:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00852643
• Corporate Authors:

  Central Laboratory of Bridges & Highways, France

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

Language

• French

Media Info

• Features: Figures; Photos; References; Tables;
• Pagination: 56 p.
• Serial:
  • Publication of: Central Laboratory of Bridges & Highways, France
  • Publisher: Central Laboratory of Bridges & Highways, France
  • ISSN: 0085-2643

Subject/Index Terms

• TRT Terms: Aggregates; Backscattering; Concrete; Deceleration; Density; Fresh concrete; Gamma rays; Humidity; Measurement; Moisture content; Neutrons; Nuclear radiation; Research reports; Scattering; Silos
• Uncontrolled Terms: Neutron scattering
• ITRD Terms: 4577: Aggregate; 6160: Back scattering apparatus; 5416: Deceleration; 5908: Density; 4750: Fresh concrete; 6706: Gamma ray; 6136: Measurement; 5920: Moisture content; 6715: Neutron radiation; 6726: Radiation (nucl); 8559: Research report; 3618: Silo
• Subject Areas: Geotechnology; Highways; Materials; Planning and Forecasting; I32: Concrete; I36: Aggregates; I72: Traffic and Transport Planning;

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