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https://nap.nationalacademies.org/catalog/27432/critical-issues-in-transportation-for-2024-and-beyond

SUMMATION REPORT ON TPPT TEST CONSTRUCTIONS

TPPT-KOERAKENTEIDEN YHTEENVETORAPORTTI

This study was a part of the Finnish Road Structures Research Programme (TPPT) started in 1994, and financed by Finnish Road Administration (Finnra). The objective of the program was to reduce the annual costs and to decrease the unpredictable damage of the roads. The major environmental aspect was the use of local second class materials with the aim of saving natural gravel deposits. In TPPT the road structure design system was developed. The design is based on the functional properties of the roads and materials. The design of the road has been divided in three tasks; fatique design, frost design, settlement calculation. The method for life cycle cost calculations on the pavement was developed, too. The LCC can be used to compare the designed road structures which are potentia to be constructed. In TPPT program 19 test roads were constructed during 1995-1999. In each test road there were 2-10 test sections. The road structures were designed for local circumstances and to solve different problems taking into account the main stress factors (traffic, frost, subgrade settlement). The constructed test roads were as follows: 1.frost prevention structures (sod peat insulation, blast-furnace slag) 2.reinforced structures (steel mesh reinforcement, geoprofile, reinforcing geotextiles) 3.homogenised subgrade treated with binding agents 4.till structures (materials from the old pavement layers and the enbankment were used for improving the properties of the moraine) 5.unbound base course structures 6.fatigue resistant structures (stabilised structures; bitumen stabilisation, hydraulic stabilisation, bitumen-cement composite and inverted stiff bituminous pavement). The test structures were instrumented with different gauges to measure: frost penetration, frost heave, soil temperature at various depths, groundwater table, snow depth beside the road, variation of moisture content, thermal conductivity, FWD-measurements, stress and strains in pavement due to moving wheel load, longitudinal unevenness (roughness), and visual condition survey. The test roads were studied by yearly measurements and observations until 2001. Conclusions of the behaviour of the test structures are presented in this report. Recommendations to monitor the test roads in near future are also presented.

  • Availability:
  • Corporate Authors:

    TIELAITOS (FINNISH NATIONAL ROAD ADMINISTRATION)

    OPASTINSILTA 12 A
    HELSINKI,   Finland  FIN-00520
  • Authors:
    • Kivikoski, H
    • PIHLAJAMAKI, J
    • TAMMIRINNE, M
  • Publication Date: 2002

Language

  • Finnish

Media Info

  • Pagination: 138 p.
  • Serial:
    • TIELAITOKSEN SELVITYKSIA
    • Volume: 8/2002
    • Issue Number: TIEH 3200742
    • Publisher: TIELAITOS (FINNISH NATIONAL ROAD ADMINISTRATION)
    • ISSN: 0788-3722

Subject/Index Terms

Filing Info

  • Accession Number: 00942964
  • Record Type: Publication
  • Source Agency: VTT Technical Research Centre of Finland
  • Files: ITRD
  • Created Date: Jun 11 2003 12:00AM