PAVEMENT DESIGN

• Pavement Layer Materials


  Components of pavement structure
• Flexible pavement


  relatively thin wearing surface over base and subbase course layers on compacted subgrade
• TRRL


  Transport Road Research Laboratory
• Steps for TRRL


  CESAL,CBR, Pavement Materials, Layer Thicknesses
• Pavement layer materials for flexible trrl

  Wearing course, Base, Subbase, Subgrade
• AASHTO


  American Association of State Highway Transportation Official
• Pavement Performance


  ability of a pavement to serve the traffic it is designed for
• PSI


  Present serviceability index
• Design reliability


  probability that a pavement section designed using this process will perform satisfactorily over the traffic and environmental conditions for the design period
• Overall standard deviation (So)


  accounts for variations in the traffic forecast and pavement prediction
• Resilient Modulus


  elastic property of soil recognizing its nonlinear characteristics
• Drainage


  used to modify the effect of the subbase and the base layers on the pavement performance
• Structural Number


  indicative measure of the collective load carrying capacity of the pavement layers
• Rigid Pavement


  cement concrete slab resting on a granular subbase
• Contraction Joints


  used to control the location of slab cracking that develop due to the stresses associated to moisture-related and thermal contraction
• Isolation Joints


  joint placed between the concrete pavement and an adjacent pavement, a fixed structure, or an embedded object to allow them to move independently
• Jointed Plain Concrete Pavement

  concrete pavement with no reinforcing and temperature bars; sometimes have dowel barts at transverse joints and steel tie bars at longitudinal joints
• Design Reliability


  Probability that a pavement section designed using this process will perform satisfactorily over the traffic and environmental conditions for the design period
• Construction Joints


  used to provide transition between concrete laid at different times
• Continuously reinforced concrete pavement

  concrete pavement without transverse joints
• pavement performance


  ability of a pavement to serve the traffic it is designed for
• load transfer


  ability of a concrete pavement to transfer/distribute the load across discontinuities such as joints or cracks