Long term performance of a reinforced base layer on a gravel road

Seppo Saarelainen, Pekka Halonen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

Abstract

On a local gravel road at Leppävirta, Central Finland (about 62° 27' N, 28° E), test pavements were constructed in the fall of 1996 to strengthen a gravel road, suffering from thaw damage. The improvement methods studied were bitumen stabilization in situ of the base layer, and a macadam overlay reinforced with a steel net. In the primary monitoring in 1997-98 it was fond that the improvement of the surface modulus was significantly higher at the reinforced pavement than a non-reinforced one. The estimated material modulus of the reinforced macadam layer (200mm thick) during thaw was 300-500 MPa. According to the FWD measurements in the spring of 2005, the back-calculated, equivalent material modulus of the reinforced layer during thaw had decreased to about a half of the value estimated after construction. The modulus in summer state was not observed to have significantly changed. In the test pit excavated across the road down to the reinforcement, and the leveling of the reinforcement it could be observed a bending (rutting) of the reinforcement. The estimated rut depth was 25 - 85 mm, and it was increasing with decreasing minimum thaw modulus of the gravel pavement. The rutting of the pavement was relatively low. Thus, it seems obvious that the reinforcement should be treated, not only applying as stiffening of the overlay, but also as an anchoring element, preventing the horizontal and shear stresses below.
Original languageEnglish
Title of host publicationProceedings of the 13th International Conference on Cold Regions Engineering
Subtitle of host publicationCurrent Practice in Cold Regions Engineering
EditorsMichael Davies
PublisherAmerican society of civil engineers
ISBN (Print)9780784408360
DOIs
Publication statusPublished - 2007
MoE publication typeB3 Non-refereed article in conference proceedings
Event13th International Conference on Cold Regions Engineering 2006: Current Practice in Cold Regions Engineering - Orono, United States
Duration: 23 Jul 200726 Jul 2007

Conference

Conference13th International Conference on Cold Regions Engineering 2006
CountryUnited States
CityOrono
Period23/07/0726/07/07

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Keywords

  • roads
  • gravel
  • gravel roads
  • thaw
  • thaw weakening
  • thaw damage

Cite this

Saarelainen, S., & Halonen, P. (2007). Long term performance of a reinforced base layer on a gravel road. In M. Davies (Ed.), Proceedings of the 13th International Conference on Cold Regions Engineering: Current Practice in Cold Regions Engineering [56] American society of civil engineers. https://doi.org/10.1061/40836(210)56