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Runway 13-31 Renovation Allegheny County Airport

Client:Allegheny County Airport
Location:Pittsburgh, Pennsylvania


The scope of the exploration and analysis included subsurface exploration, field and laboratory testing, engineering analysis and evaluation of the subgrade materials.

During the sampling operations, standard penetration tests (SPT) were performed at pre-determined intervals in order to obtain the standard penetration value of the soil. Water level depths were obtained during the test boring operations. Field California Bearing Ratio (CBR) Tests were performed on materials obtained from each test boring.

The test borings revealed the depth to bedrock to be relatively shallow. This fact indicated that the study portion of the runway was probably cut at the time of original construction, circa 1939. Also, an apparent perched water table occurs in this portion of the runway. Because the proposed design for the pavement structural section will be on the order of 27 inches thick, a major portion of the existing pavement structural section will have to be removed nearly to bedrock. High CBR values indicated required modifications to initial design recommendations.


Key Project Services

  • Twenty test borings and twenty California Bearing Ratio tests (CBR tests).
  • Moisture content testing.
  • Identification tests and strength parameter testing.
  • Expansive properties.
  • Particulate sizes and relative size distributions.
  • Observed moisture content and other pertinent parameters.
  • Water Level Depths.


Laboratory Testing

  • Moisture Content.
  • Liquid Limit Test.
  • Plastic Limit Test.
  • Particle Size Analysis.
  • Modified Proctor Test.
  • California Bearing Ratio Test

 



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