EXPERIMENTAL SAND AND GRAVEL-BITUMEN SECTIONS

SECTIONS EXPERIMENTALES DE SABLE ET GRAVE-BITUME

This article describes the studies and construction of sand-bitumen experimental sections containing rolled silico calcareous materials (0/6) and of gravel-bitumen sections containing hard crushed limestone (0/3-3/6 and 6/20). The studies comprise standard formulation tests (duriez and marshall test) and basic tests simulating some aspects of working conditions on the road (dynamic modulus, service life under dynamic creep conditions, direct tensile stress). Both materials studied showed an excellent adhesion to bitumen. The results obtained enabled the sand to be classified (in particular as regards its dynamic modulus: 37000 bars at 20 deg C, gamma = 10HZ) as very high- quality sand for asphalt impregnation. As regards the gravel (dynamic modulus 85000 bars at 20 degrees C, gamma 10HZ), the mixture showed a very high standard of performance: two experimental sections carrying traffic were built from the formulae studied. First observations were made on the manufacture, laying and compaction processes. Subsequent observations were made on the compaction gradient by means of nucleodensitometer examination of core samples, on deflections by means of the lacroix deflectograph, and on behaviour under traffic conditions; non destructive testing was carried out with a lightweight vibrator. The advantages of hot coated bitumen pavement courses are discussed. /TRRL/

  • Corporate Authors:

    Laboratoire Central des Ponts et Chausees (LCPC)

    Boulevard Lefebvre 58
    Paris Cedex 15,   France  F-75732
  • Authors:
    • Grimaux, J P
    • Chomton, G
    • Valla, L
  • Publication Date: 1972-1-2

Language

  • French

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00265099
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Mar 26 1975 12:00AM