Development of Grading Requirements for Drought Weather Conditions

In a recent case history involving longitudinal cracks that developed in two re‒constructed city streets within weeks following the completion of the paving and opening up to traffic, forensic work was completed to explain the causes for the cracking. The question was asked by the City of Norman of the project geotechnical engineer, Burgess Engineering and Testing, Inc. (BETI), to explain why the newly constructed pavements developed predominantly longitudinal cracks within weeks following completion of the paving. A compounding factor in this forensic study was the fact that the geotechnical engineer requested that the explanation of the longitudinal cracking be done with minimum of testing and cost. This request necessitated the use of estimated soil properties. In the investigative process it became apparent that construction grading practices were partly to blame for the cracking in the pavements. In the final analysis of re‒constructed pavement subgrades, the concept of treating a subgrade at its equilibrium moisture content that had been covered for an extensive time period as an asset is recommended. The paper first discusses the case history for two City streets ‒ Himes and Johnston, followed by drought indices and then a strategy to minimize the effects of drought weather conditions in grading operations.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; Photos; References; Tables;
  • Pagination: pp 553-569
  • Monograph Title: Proceedings of the 66th Highway Geology Symposium (HGS 2015)

Subject/Index Terms

Filing Info

  • Accession Number: 01638273
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 13 2017 12:35AM