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A flexible pavement consists of surface layer (asphalt concrete), granular base layer and subbase layer. Please...

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Civil Engineering

A flexible pavement consists of surface layer (asphaltconcrete), granular base layer and subbase layer. Please determinethe thickness of each layer using AASHTO (1993) design method usingthe Design Chart

  • Design ESAL = 2 million
  • It takes approximately one week for water to be drained fromwithin the pavement, and the pavement structure will be exposed tomoisture levels approaching saturation for 40 percent of thetime
  • Resilient modulus of subgrade is 9000 lb/inch/inch; Resilientmodulus of base is 31,000 lb/inch/inch; Resilient modulus ofsubbase is 13,500 lb/inch/inch
  • Reliability level = 99%
  • Standard deviation = 0.5
  • Initial serviceability index, pi = 4.5; Terminal serviceabilityindex, pi = 2.5
  • a1 = 0.44; a2 = 0.14; a3 = 0.10

Answer & Explanation Solved by verified expert
4.0 Ratings (605 Votes)
Step 1ESAL2x106PSI45252Mr31000 psi for BaseMr13500 psi for sub baseMr9000 psi for subgrade soilStep 2From AASHTO 1993    See Answer
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