Highway Design Guidelines
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Questions and Answers

Which type of investigation involves detailed investigation of the soil surface on which the pavement is constructed?

  • Subsurface Investigation
  • Subgrade Investigation (correct)
  • Pavement Investigation
  • Soil Investigation

    • What should be considered when making deep cuts, large embankments across marshland, or if weak layers are present in the subsurface?

  • The existing topography and the nature of subsoil (correct)
  • The color and visual description of each layer
  • The water levels below the surface
  • The type and depth of each layer

    • What should be done to classify the soil in the subgrade?

  • Take small samples at each auger hole and conduct 'in the field' soils classification (correct)
  • Take small samples in the test pit and conduct 'in the field' soils classification
  • Conduct an in-situ density test
  • Take large samples at each auger hole and conduct 'in the field' soils classification

    • What should be done to investigate the subgrade on existing roads?

    <p>Make auger borings and test pits along the centerline</p> Signup and view all the answers

    Which standards should be followed for in-situ density testing?

    <p>AASHTO T 191</p> Signup and view all the answers

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