Feasibility of Using 4th Power Law in Design of Plastic Deformation Resistant Low Volume Roads


UZ V. E. , SALTAN M. , GÖKALP I.

3rd International Conference on Transportation Geotechnics (ICTG), Guimaraes, Portugal, 01 September 2016, vol.143, pp.961-970 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 143
  • Doi Number: 10.1016/j.proeng.2016.06.084
  • City: Guimaraes
  • Country: Portugal
  • Page Numbers: pp.961-970

Abstract

A low volume road (LVR) structural design has two phases: first one is selection of appropriate construction materials and second is the determination of layer thicknesses under the certain traffic and environmental conditions with considering the subgrade bearing capacity. Pavements are prompted to serve the traffic without reaching the terminal serviceability index over its design life. Rut accumulation (plastic deformation) is the most common pavement deterioration type of flexible pavements. Therefore the main goal of the design is prevent rutting. Many low volume road design manual assume that plastic deformation occurs only in subgrade. Construction of overlying layers by selective high performance materials according to the related material and construction specifications is the reason of this assumption. In fact, the assumption is not much reasonable especially for with no, or thinly overlaid low volume road pavements, where the major structural strength is comprised of unbound granular pavement materials and where the principal distress mechanism is rutting in the aggregate layers. Subgrade bearing capacity and the traffic are the main input parameters in the design stage of low volume roads.