LABELLING OF PULVERIZED MATERIALS WITH RADIOACTIVE ISOTOPES

MARQUAGE DE PULVERULENTS MINERAUX PAR DES ISOTOPES RADIOACTIFS

Most composite materials used in civil engineering contain pulverized substances; the distribution of the latter has a large influence on the quality of the materials (gravel, bituminous mixtures, concrete). A radioactive labelling technique was developed for these fines in order to observe them easily and to determine their homogeneity during the production of the mixture. The labelling consists of the adsorption of chelates of radioactive cations by the fines: the complete instantaneous reaction occurs in inert hydrocarbon, making it possible to treat some pulverized materials subject to modifications, in aqueous solutions. Labelling takes place by simple contact and is easily automated. This article deals with the case of limestone fines and studies the three phases of the process (extraction, physical adsorption, thermal treatment). Attention is drawn to the precautions to be taken in the case of surface labelling (solidity, validity, labelling of a sufficient mass) so that subsequent measurements may be easily interpreted. This labelling procedure is applicable to all mineral pulverized materials smaller than 200 micrometers. Details are given of a simplified method to verify on a new product that labelling can solve the problem considered. (TRRL)

• Corporate Authors:

  Laboratoire Central des Ponts et Chausees (LCPC)

  Boulevard Lefebvre 58
  Paris Cedex 15,   France  F-75732
• Authors:
  • Gauthier, C
• Publication Date: 1980-1-2

Language

• French

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 7-16
• Serial:
  • Bulletin de Liaison des Lab des Ponts et Chaussees
  • Issue Number: 105
  • Publisher: Laboratoire Central des Ponts et Chausees (LCPC)

Subject/Index Terms

• TRT Terms: Absorption; Bituminous mixtures; Civil engineering; Comminution; Concrete; Fillers (Materials); Fines (Materials); Gravel; Homogeneity; Hydrocarbons; Labeling; Manufactures; Measurement; Micrometers; Nuclear density gages; Physical properties; Radioisotopes; Tracers (Chemistry)
• ITRD Terms: 4967: Bituminous mixture; 4755: Concrete; 4599: Filler; 5916: Homogeneity; 3647: Manufacture; 6718: Tracer (nucl)
• Subject Areas: Geotechnology; Highways; I36: Aggregates;

Filing Info

• Accession Number: 00325691
• Record Type: Publication
• Source Agency: Laboratoire Central des Ponts et Chausees (LCPC)
• Files: ITRD, TRIS
• Created Date: Sep 16 1981 12:00AM