GRANULAR EVOLUTION IN STORED MATERIALS. MYTH OR TRUTH?

EVOLUTION GRANULAIRE DES FOURNITURES AU STOCKAGE-LEGENDE OU REALITE

The granular evolution in chippings under the tyres of construction machines travelling over storage piles is a phenomenon often concealed by segregation, contamination, incidents during screening and disorders pertaining to materials supplied. This phenomenon exists without doubt but it varies in extent depending on the existence and magnitude of parameters inherent to materials and storage conditions. It may be surprising to observe that, for a quartzite sandstone, up to 13% sand can be created over the whole of one storage heap (and not only on its access way) with certain storage conditions (stratified stacking in thin layers over a small surface area), in spite of the fact that the material has a mechanical strength sufficient for roadbases (Los Angeles 22, range 19 to 24,5). This evolution is the result of crushing by pressure especially crushing of the edges of the chippings and not that of friction wear. It is not harmful provided it is taken into account before and during the use of stored materials, except in techniques where fines must not be present. /TRRL/

  • Corporate Authors:

    Laboratoire Central des Ponts et Chausees (LCPC)

    Boulevard Lefebvre 58
    Paris Cedex 15,   France  F-75732
  • Authors:
    • L'Haridon, R
  • Publication Date: 1977-9-10

Language

  • French

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00194094
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Jun 13 1979 12:00AM