CONSIDERATIONS ON THE USE OF MATS IN ROAD CONSTRUCTION

CONSIDERAZIONI SULL'IMPIEGO DEI "NONTESSUTI" NEL SETTORE DELLE COSTRUZIONI STRADALI

The synthetic polyester fibre trevira permits the manufacture of mats (non-woven fabrics) which are known as "trevira spunbond". The properties required for such products in civil engineering in general and highway construction in particular (thermal and mechanical strength, durability and chemical resistance, uniform quality, etc) are examined and discussed in the light of theoretical knowledge about the behaviour of such materials on a yielding soil base. The conditions to be fulfilled to guarantee that the material meets its functional requirements (for instance as a separation or load distribution layer) during the whole of its life are defined. A special advantage is seen in the light weight (200 - 500 g/m2), the ease of installation and the adaptability to any soil type. Some recommendations for site use are given. Theoretical considerations are based on tests and measurements of loads, settlement and compaction and which showed the influence of the reinforcement on the deformation of the road. A simple model permits the determination of the reinforcing and load distribution effects under realistic conditions, including construction site traffic. It was found that a layer of reinforcing fabric of 500 g/m2 on the road bed corresponds to the effect of an unbound base layer 20 cm thick, permits high degrees of compaction and a high modulus of elasticity in the overlying strata, reduces the loosening effect of freezing-thawing cycles and because of the drainage effect maintains the plasticity index after compaction at an almost constant level. /TRRL/

Language

  • Italian

Media Info

  • Features: Figures; Photos;
  • Pagination: p. 14-8
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00194108
  • Record Type: Publication
  • Source Agency: Bundesanstalt für Straßenwesen (BASt)
  • Files: ITRD, TRIS
  • Created Date: Jun 13 1979 12:00AM