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The National Academies

NCHRP 20-07/Task 375 [Active]

Improvements to the Dry Back Procedure of AASHTO T 209
[ NCHRP 20-07 (Research for AASHTO Standing Committee on Highways) ]

  Project Data
Funds: $75,000
Staff Responsibility: Edward Harrigan
Research Agency: Pavement Systems, LLC
Principal Investigator: Haleh Azari
Effective Date: 5/6/2015
Completion Date: 6/30/2017

OBJECTIVES
The objectives of this study are to (1) determine the appropriate trigger measure such as asphalt or water absorption and to identify the appropriate trigger value, which necessitates use of Dry Back procedure, and (2) determine if there are improvements that can be made to the Dry Back procedure to make it less subjective and produce more repeatable and reliable test results. The results of the research shall be used to modify the existing AASHTO T 209 test procedure.

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