The National Academies

NCHRP 09-33A [Completed]

Adapting SPT Specification Criteria to HMA Mix Design

  Project Data
Funds: 59,540
Research Agency: Arizona State University
Principal Investigator: Mohamed El-Basyouny
Effective Date: 9/15/2007
Completion Date: 2/28/2011
Comments: The final report is available as NCHRP Web-Only Document 157.

The objective of this project was to develop a software program for evaluating the potential performance of HMA mix designs in combination with their intended pavement structures. This Program for Integrated Analysis of HMA Mix And Structural Designs is coded as a Microsoft Excel spreadsheet and incorporates the MEPDG spreadsheet solutions developed in NCHRP Projects 9-19 and 9-22. Predictions of permanent deformation (rutting) and fatigue cracking are made on the basis of the estimated HMA dynamic modulus, E*; thermal cracking predictions are based on estimates of the HMA creep compliance, D. The program will serve as a multi-purpose tool for HMA mix and structural design engineers. First, it provides an easy graphical check that a prospective job mix formula (JMF) falls within the acceptable limits of air voids and effective binder volume established by the project’s HMA specification. Second, using powerful, pre-solved solutions of the MEPDG, it provides rapid estimates of the performance of the JMF over the design life of the HMA pavement and whether the JMF will satisfy specific pavement distress criteria established by the agency. Third, it can test “what-if” scenarios by estimating how changes in the JMF, pavement structure, or both may affect performance. Finally, it can be used in forensic investigations of pavement distresses, by assessing the potential contributions of the HMA and pavement structure to distress development before any testing is conducted.

The project final report is available as NCHRP Web-Only Document 157, “Adapting Specification Criteria for Simple Performance Tests to HMA Mix Design.” The companion Excel spreadsheet Program for Integrated Analysis of HMA Mix And Structural Designs and supporting files may be downloaded here.

This software is offered as is, without warranty or promise of support of any kind either expressed or implied. Under no circumstance will the National Academy of Sciences or the Transportation Research Board (collectively "TRB") be liable for any loss or damage caused by the installation or operation of this product. TRB makes no representation or warranty of any kind, expressed or implied, in fact or in law, including without limitation, the warranty of merchantability or the warranty of fitness for a particular purpose, and shall not in any case be liable for any consequential or special damages.

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