Laboratory studies having shown a high pozzolan content in basalt rocks, a new road construction technique was developed for regions containing a large quantity of basalt (auvergne especially). This technique is the gravel-basalt-lime mix. In 1975, a 500-M experimental section containing basalt very reactive to lime was built in the Puy-de-Dome Department. The results were very encouraging and showed satisfactory mechanical behaviour (deflections, rd products and core sampling). On the other hand cracking is quicker than for gravel/pozzolan/lime mixes. Following this first experimental section, a second one was built in the cantal department in 1976. The basalt selected had a much lower reactivity than the previous ones; because of that, the stabilized gravel stiffens far more slowly. This new technique becomes economically competitive compared to gravel/pozzolan/lime mixes when the higher supply price of the binder is compensated by its transport cost. (TRRL)

  • Corporate Authors:

    Laboratoire Central des Ponts et Chausees (LCPC)

    Boulevard Lefebvre 58
    Paris Cedex 15,   France  F-75732
  • Authors:
    • Faure, B
    • Geoffray, J M
  • Publication Date: 1978-3-4


  • French

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00309196
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: May 21 1980 12:00AM